import asyncio
import copy
import io
import json
import re
import shutil
import zipfile
from collections import defaultdict
from copy import deepcopy
from datetime import datetime, timezone
from pathlib import Path
from tempfile import TemporaryDirectory
from typing import AnyStr
from uuid import UUID

import aiofiles
import anyio
import httpx
import orjson
import sqlalchemy as sa
from emoji import demojize, purely_emoji
from lfx.base.constants import (
    FIELD_FORMAT_ATTRIBUTES,
    NODE_FORMAT_ATTRIBUTES,
    ORJSON_OPTIONS,
    SKIPPED_COMPONENTS,
    SKIPPED_FIELD_ATTRIBUTES,
)
from lfx.log.logger import logger
from lfx.template.field.prompt import DEFAULT_PROMPT_INTUT_TYPES
from lfx.utils.component_aliases import flatten_components_with_aliases
from lfx.utils.util import escape_json_dump
from sqlalchemy.exc import NoResultFound
from sqlalchemy.orm import selectinload
from sqlmodel import col, select
from sqlmodel.ext.asyncio.session import AsyncSession

from langflow.initial_setup.constants import (
    ASSISTANT_FOLDER_DESCRIPTION,
    ASSISTANT_FOLDER_NAME,
    STARTER_FOLDER_DESCRIPTION,
    STARTER_FOLDER_NAME,
)
from langflow.services.database.models.flow.model import Flow, FlowCreate
from langflow.services.database.models.folder.constants import (
    DEFAULT_FOLDER_DESCRIPTION,
    DEFAULT_FOLDER_NAME,
    LEGACY_FOLDER_NAMES,
)
from langflow.services.database.models.folder.model import Folder, FolderCreate, FolderRead
from langflow.services.deps import (
    get_auth_service,
    get_settings_service,
    get_storage_service,
    get_variable_service,
    session_scope,
)

# In the folder ./starter_projects we have a few JSON files that represent
# starter projects. We want to load these into the database so that users
# can use them as a starting point for their own projects.


def update_projects_components_with_latest_component_versions(project_data, all_types_dict):
    all_types_dict_flat = flatten_components_with_aliases(all_types_dict)

    node_changes_log = defaultdict(list)
    project_data_copy = deepcopy(project_data)

    for node in project_data_copy.get("nodes", []):
        node_data = node.get("data").get("node")
        node_type = node.get("data").get("type")

        if node_type in all_types_dict_flat:
            latest_node = all_types_dict_flat.get(node_type)
            latest_template = latest_node.get("template")
            node_data["template"]["code"] = deepcopy(latest_template["code"])

            # Sync field_order so the UI renders fields in the correct order
            latest_field_order = latest_node.get("field_order")
            if latest_field_order is not None:
                node_data["field_order"] = latest_field_order

            # skip components that are having dynamic values that need to be persisted for templates

            if node_type in SKIPPED_COMPONENTS:
                continue

            is_tool_or_agent = node_data.get("tool_mode", False) or node_data.get("key") in {
                "Agent",
                "LanguageModelComponent",
                "TypeConverterComponent",
            }
            has_tool_outputs = any(output.get("types") == ["Tool"] for output in node_data.get("outputs", []))
            if "outputs" in latest_node and not has_tool_outputs and not is_tool_or_agent:
                # Deep copy to avoid mutating the shared latest_node template across flows
                new_outputs = deepcopy(latest_node["outputs"])
                # Set selected output as the previous selected output with type migration support
                type_migrations = {
                    "Data": "JSON",
                    "DataFrame": "Table",
                }
                for output in new_outputs:
                    node_data_output = next(
                        (output_ for output_ in node_data["outputs"] if output_["name"] == output["name"]),
                        None,
                    )
                    if node_data_output:
                        old_selected = node_data_output.get("selected")
                        if old_selected:
                            # Old flows may use Data/DataFrame; map to JSON/Table for backward compatibility
                            migrated_selected = type_migrations.get(old_selected, old_selected)
                            if migrated_selected in output.get("types", []):
                                output["selected"] = migrated_selected
                node_data["outputs"] = new_outputs

            if node_data["template"]["_type"] != latest_template["_type"]:
                node_data["template"]["_type"] = latest_template["_type"]
                if node_type != "Prompt":
                    node_data["template"] = deepcopy(latest_template)
                else:
                    for key, value in latest_template.items():
                        if key not in node_data["template"]:
                            node_changes_log[node_type].append(
                                {
                                    "attr": key,
                                    "old_value": None,
                                    "new_value": value,
                                }
                            )
                            node_data["template"][key] = deepcopy(value)
                        elif isinstance(value, dict) and value.get("value"):
                            node_changes_log[node_type].append(
                                {
                                    "attr": key,
                                    "old_value": node_data["template"][key],
                                    "new_value": value,
                                }
                            )
                            node_data["template"][key]["value"] = value["value"]
                    for key in node_data["template"]:
                        if key not in latest_template:
                            node_data["template"][key]["input_types"] = DEFAULT_PROMPT_INTUT_TYPES
                node_changes_log[node_type].append(
                    {
                        "attr": "_type",
                        "old_value": node_data["template"]["_type"],
                        "new_value": latest_template["_type"],
                    }
                )
            else:
                for attr in NODE_FORMAT_ATTRIBUTES:
                    latest_attr_value = latest_node.get(attr)
                    current_attr_value = node_data.get(attr)

                    if (
                        attr in latest_node
                        # Check if it needs to be updated
                        and latest_attr_value != current_attr_value
                    ):
                        node_changes_log[node_type].append(
                            {
                                "attr": attr,
                                "old_value": current_attr_value,
                                "new_value": latest_attr_value,
                            }
                        )
                        node_data[attr] = deepcopy(latest_attr_value)

                for field_name, field_dict in latest_template.items():
                    if field_name not in node_data["template"]:
                        node_data["template"][field_name] = deepcopy(field_dict)
                        continue
                    # The idea here is to update some attributes of the field
                    to_check_attributes = FIELD_FORMAT_ATTRIBUTES
                    # Skip specific field attributes that should respect the starter project template values.
                    # Currently we skip 'advanced' so that a field marked as advanced in the component code
                    # will NOT overwrite the value specified in the starter project template. This preserves
                    # the intended UX configuration of the starter projects.
                    # SKIPPED_FIELD_ATTRIBUTES = {"advanced"}
                    # Iterate through the attributes we want to potentially update
                    for attr in to_check_attributes:
                        # Respect the template value by not updating if the attribute is in the skipped set
                        if attr in SKIPPED_FIELD_ATTRIBUTES:
                            continue
                        if (
                            attr in field_dict
                            and attr in node_data["template"].get(field_name)
                            # Check if it needs to be updated
                            and field_dict[attr] != node_data["template"][field_name][attr]
                        ):
                            node_changes_log[node_type].append(
                                {
                                    "attr": f"{field_name}.{attr}",
                                    "old_value": node_data["template"][field_name][attr],
                                    "new_value": field_dict[attr],
                                }
                            )
                            node_data["template"][field_name][attr] = deepcopy(field_dict[attr])
            # Remove fields that are not in the latest template
            if node_type != "Prompt":
                for field_name in list(node_data["template"].keys()):
                    is_tool_mode_and_field_is_tools_metadata = (
                        node_data.get("tool_mode", False) and field_name == "tools_metadata"
                    )
                    if field_name not in latest_template and not is_tool_mode_and_field_is_tools_metadata:
                        node_data["template"].pop(field_name)
    log_node_changes(node_changes_log)
    return project_data_copy


def scape_json_parse(json_string: str) -> dict:
    if json_string is None:
        return {}
    if isinstance(json_string, dict):
        return json_string
    parsed_string = json_string.replace("œ", '"')
    return json.loads(parsed_string)


def update_new_output(data):
    nodes = copy.deepcopy(data["nodes"])
    edges = copy.deepcopy(data["edges"])

    for edge in edges:
        if "sourceHandle" in edge and "targetHandle" in edge:
            new_source_handle = scape_json_parse(edge["sourceHandle"])
            new_target_handle = scape_json_parse(edge["targetHandle"])
            id_ = new_source_handle["id"]
            source_node_index = next((index for (index, d) in enumerate(nodes) if d["id"] == id_), -1)
            source_node = nodes[source_node_index] if source_node_index != -1 else None

            if "baseClasses" in new_source_handle:
                if "output_types" not in new_source_handle:
                    if source_node and "node" in source_node["data"] and "output_types" in source_node["data"]["node"]:
                        new_source_handle["output_types"] = source_node["data"]["node"]["output_types"]
                    else:
                        new_source_handle["output_types"] = new_source_handle["baseClasses"]
                del new_source_handle["baseClasses"]

            if new_target_handle.get("inputTypes"):
                intersection = [
                    type_ for type_ in new_source_handle["output_types"] if type_ in new_target_handle["inputTypes"]
                ]
            else:
                intersection = [
                    type_ for type_ in new_source_handle["output_types"] if type_ == new_target_handle["type"]
                ]

            selected = intersection[0] if intersection else None
            if "name" not in new_source_handle:
                new_source_handle["name"] = " | ".join(new_source_handle["output_types"])
            new_source_handle["output_types"] = [selected] if selected else []

            if source_node and not source_node["data"]["node"].get("outputs"):
                if "outputs" not in source_node["data"]["node"]:
                    source_node["data"]["node"]["outputs"] = []
                types = source_node["data"]["node"].get(
                    "output_types", source_node["data"]["node"].get("base_classes", [])
                )
                if not any(output.get("selected") == selected for output in source_node["data"]["node"]["outputs"]):
                    source_node["data"]["node"]["outputs"].append(
                        {
                            "types": types,
                            "selected": selected,
                            "name": " | ".join(types),
                            "display_name": " | ".join(types),
                        }
                    )
            deduplicated_outputs = []
            if source_node is None:
                source_node = {"data": {"node": {"outputs": []}}}

            for output in source_node["data"]["node"]["outputs"]:
                if output["name"] not in [d["name"] for d in deduplicated_outputs]:
                    deduplicated_outputs.append(output)
            source_node["data"]["node"]["outputs"] = deduplicated_outputs

            edge["sourceHandle"] = escape_json_dump(new_source_handle)
            edge["data"]["sourceHandle"] = new_source_handle
            edge["data"]["targetHandle"] = new_target_handle
    # The above sets the edges but some of the sourceHandles do not have valid name
    # which can be found in the nodes. We need to update the sourceHandle with the
    # name from node['data']['node']['outputs']
    for node in nodes:
        if "outputs" in node["data"]["node"]:
            for output in node["data"]["node"]["outputs"]:
                for edge in edges:
                    if node["id"] != edge["source"] or output.get("method") is None:
                        continue
                    source_handle = scape_json_parse(edge["sourceHandle"])
                    if source_handle["output_types"] == output.get("types") and source_handle["name"] != output["name"]:
                        source_handle["name"] = output["name"]
                        if isinstance(source_handle, str):
                            source_handle = scape_json_parse(source_handle)
                        edge["sourceHandle"] = escape_json_dump(source_handle)
                        edge["data"]["sourceHandle"] = source_handle

    data_copy = copy.deepcopy(data)
    data_copy["nodes"] = nodes
    data_copy["edges"] = edges
    return data_copy


def update_edges_with_latest_component_versions(project_data):
    """Update edges in a project with the latest component versions.

    This function processes each edge in the project data and ensures that the source and target handles
    are updated to match the latest component versions. It tracks all changes made to edges in a log
    for debugging purposes.

    Args:
        project_data (dict): The project data containing nodes and edges to be updated.

    Returns:
        dict: A deep copy of the project data with updated edges.

    The function performs the following operations:
    1. Creates a deep copy of the project data to avoid modifying the original
    2. For each edge, extracts and parses the source and target handles
    3. Finds the corresponding source and target nodes
    4. Updates output types in the source handle based on the node's outputs
    5. Updates input types in the target handle based on the node's template
    6. Escapes and updates the handles in the edge data
    7. Logs all changes made to the edges
    """
    # Initialize a dictionary to track changes for logging
    edge_changes_log = defaultdict(list)
    # Create a deep copy to avoid modifying the original data
    project_data_copy = deepcopy(project_data)

    # Create a mapping of node types to node IDs for node reconciliation
    node_type_map = {}
    for node in project_data_copy.get("nodes", []):
        node_type = node.get("data", {}).get("type", "")
        if node_type:
            if node_type not in node_type_map:
                node_type_map[node_type] = []
            node_type_map[node_type].append(node.get("id"))

    # Process each edge in the project
    for edge in project_data_copy.get("edges", []):
        # Extract and parse source and target handles
        source_handle = edge.get("data", {}).get("sourceHandle")
        source_handle = scape_json_parse(source_handle)
        target_handle = edge.get("data", {}).get("targetHandle")
        target_handle = scape_json_parse(target_handle)

        # Find the corresponding source and target nodes
        source_node = next(
            (node for node in project_data_copy.get("nodes", []) if node.get("id") == edge.get("source")),
            None,
        )
        target_node = next(
            (node for node in project_data_copy.get("nodes", []) if node.get("id") == edge.get("target")),
            None,
        )

        # Try to reconcile missing nodes by type
        if source_node is None and source_handle and "dataType" in source_handle:
            node_type = source_handle.get("dataType")
            if node_type_map.get(node_type):
                # Use the first node of matching type as replacement
                new_node_id = node_type_map[node_type][0]
                logger.info(f"Reconciling missing source node: replacing {edge.get('source')} with {new_node_id}")

                # Update edge source
                edge["source"] = new_node_id

                # Update source handle ID
                source_handle["id"] = new_node_id

                # Find the new source node
                source_node = next(
                    (node for node in project_data_copy.get("nodes", []) if node.get("id") == new_node_id),
                    None,
                )

                # Update edge ID (complex as it contains encoded handles)
                # This is a simplified approach - in production you'd need to parse and rebuild the ID
                old_id_prefix = edge.get("id", "").split("{")[0]
                if old_id_prefix:
                    new_id_prefix = old_id_prefix.replace(edge.get("source"), new_node_id)
                    edge["id"] = edge.get("id", "").replace(old_id_prefix, new_id_prefix)

        if target_node is None and target_handle and "id" in target_handle:
            # Extract node type from target handle ID (e.g., "AstraDBGraph-jr8pY" -> "AstraDBGraph")
            id_parts = target_handle.get("id", "").split("-")
            if len(id_parts) > 0:
                node_type = id_parts[0]
                if node_type_map.get(node_type):
                    # Use the first node of matching type as replacement
                    new_node_id = node_type_map[node_type][0]
                    logger.info(f"Reconciling missing target node: replacing {edge.get('target')} with {new_node_id}")

                    # Update edge target
                    edge["target"] = new_node_id

                    # Update target handle ID
                    target_handle["id"] = new_node_id

                    # Find the new target node
                    target_node = next(
                        (node for node in project_data_copy.get("nodes", []) if node.get("id") == new_node_id),
                        None,
                    )

                    # Update edge ID (simplified approach)
                    old_id_suffix = edge.get("id", "").split("}-")[1] if "}-" in edge.get("id", "") else ""
                    if old_id_suffix:
                        new_id_suffix = old_id_suffix.replace(edge.get("target"), new_node_id)
                        edge["id"] = edge.get("id", "").replace(old_id_suffix, new_id_suffix)

        if source_node and target_node:
            # Extract node data for easier access
            source_node_data = source_node.get("data", {}).get("node", {})
            target_node_data = target_node.get("data", {}).get("node", {})

            # Find the output data that matches the source handle name
            output_data = next(
                (
                    output
                    for output in source_node_data.get("outputs", [])
                    if output.get("name") == source_handle.get("name")
                ),
                None,
            )

            # If not found by name, try to find by display_name
            if not output_data:
                output_data = next(
                    (
                        output
                        for output in source_node_data.get("outputs", [])
                        if output.get("display_name") == source_handle.get("name")
                    ),
                    None,
                )
                # Update source handle name if found by display_name
                if output_data:
                    source_handle["name"] = output_data.get("name")

            # Determine the new output types based on the output data
            # Always prefer "types" over "selected" to ensure we use the current type names (JSON/Table)
            # rather than potentially stale "selected" values (Data/DataFrame)
            if output_data:
                if len(output_data.get("types", [])) == 1:
                    new_output_types = output_data.get("types", [])
                elif len(output_data.get("types", [])) > 1 and output_data.get("selected"):
                    # Only use "selected" if there are multiple types available
                    # and selected is present
                    selected = output_data.get("selected")
                    # Migrate old type names to new ones
                    type_migrations = {
                        "Data": "JSON",
                        "DataFrame": "Table",
                    }
                    migrated_selected = type_migrations.get(selected, selected)
                    # Verify the migrated selected is in the available types
                    if migrated_selected in output_data.get("types", []):
                        new_output_types = [migrated_selected]
                    else:
                        # Fallback to first type if selected is invalid
                        new_output_types = output_data.get("types", [])
                else:
                    new_output_types = output_data.get("types", [])
            else:
                new_output_types = []

            # Update output types if they've changed and log the change
            if source_handle.get("output_types", []) != new_output_types:
                edge_changes_log[source_node_data.get("display_name", "unknown")].append(
                    {
                        "attr": "output_types",
                        "old_value": source_handle.get("output_types", []),
                        "new_value": new_output_types,
                    }
                )
                source_handle["output_types"] = new_output_types

            # Update input types if they've changed and log the change
            field_name = target_handle.get("fieldName")
            if field_name in target_node_data.get("template", {}) and target_handle.get(
                "inputTypes", []
            ) != target_node_data.get("template", {}).get(field_name, {}).get("input_types", []):
                edge_changes_log[target_node_data.get("display_name", "unknown")].append(
                    {
                        "attr": "inputTypes",
                        "old_value": target_handle.get("inputTypes", []),
                        "new_value": target_node_data.get("template", {}).get(field_name, {}).get("input_types", []),
                    }
                )
                target_handle["inputTypes"] = (
                    target_node_data.get("template", {}).get(field_name, {}).get("input_types", [])
                )

            # Escape the updated handles for JSON storage
            escaped_source_handle = escape_json_dump(source_handle)
            escaped_target_handle = escape_json_dump(target_handle)

            # Try to parse and escape the old handles for comparison
            try:
                old_escape_source_handle = escape_json_dump(json.loads(edge.get("sourceHandle", "{}")))
            except (json.JSONDecodeError, TypeError):
                old_escape_source_handle = edge.get("sourceHandle", "")

            try:
                old_escape_target_handle = escape_json_dump(json.loads(edge.get("targetHandle", "{}")))
            except (json.JSONDecodeError, TypeError):
                old_escape_target_handle = edge.get("targetHandle", "")

            # Update source handle if it's changed and log the change
            if old_escape_source_handle != escaped_source_handle:
                edge_changes_log[source_node_data.get("display_name", "unknown")].append(
                    {
                        "attr": "sourceHandle",
                        "old_value": old_escape_source_handle,
                        "new_value": escaped_source_handle,
                    }
                )
                edge["sourceHandle"] = escaped_source_handle
                if "data" in edge:
                    edge["data"]["sourceHandle"] = source_handle

            # Update target handle if it's changed and log the change
            if old_escape_target_handle != escaped_target_handle:
                edge_changes_log[target_node_data.get("display_name", "unknown")].append(
                    {
                        "attr": "targetHandle",
                        "old_value": old_escape_target_handle,
                        "new_value": escaped_target_handle,
                    }
                )
                edge["targetHandle"] = escaped_target_handle
                if "data" in edge:
                    edge["data"]["targetHandle"] = target_handle

        else:
            # Log an error if source or target node is not found after reconciliation attempt
            logger.error(f"Source or target node not found for edge: {edge}")

    # Log all the changes that were made
    log_node_changes(edge_changes_log)
    return project_data_copy


def log_node_changes(node_changes_log) -> None:
    # The idea here is to log the changes that were made to the nodes in debug
    # Something like:
    # Node: "Node Name" was updated with the following changes:
    # attr_name: old_value -> new_value
    # let's create one log per node
    formatted_messages = []
    for node_name, changes in node_changes_log.items():
        message = f"\nNode: {node_name} was updated with the following changes:"
        for change in changes:
            message += f"\n- {change['attr']}: {change['old_value']} -> {change['new_value']}"
        formatted_messages.append(message)
    if formatted_messages:
        logger.debug("\n".join(formatted_messages))


async def load_starter_projects(retries=3, delay=1) -> list[tuple[anyio.Path, dict]]:
    starter_projects = []
    folder = anyio.Path(__file__).parent / "starter_projects"
    await logger.adebug("Loading starter projects")
    async for file in folder.glob("*.json"):
        attempt = 0
        while attempt < retries:
            content = await file.read_text(encoding="utf-8")
            try:
                project = orjson.loads(content)
                starter_projects.append((file, project))
                break  # Break if load is successful
            except orjson.JSONDecodeError as e:
                attempt += 1
                if attempt >= retries:
                    msg = f"Error loading starter project {file}: {e}"
                    raise ValueError(msg) from e
                await asyncio.sleep(delay)  # Wait before retrying
    await logger.adebug(f"Loaded {len(starter_projects)} starter projects")
    return starter_projects


async def copy_profile_pictures() -> None:
    """Asynchronously copies profile pictures from the source directory to the target configuration directory.

    This function copies profile pictures while optimizing I/O operations by:
    1. Using a set to track existing files and avoid redundant filesystem checks
    2. Performing bulk copy operations concurrently using asyncio.gather
    3. Offloading blocking I/O to threads

    The directory structure is:
    profile_pictures/
    ├── People/
    │   └── [profile images]
    └── Space/
        └── [profile images]
    """
    # Get config directory from settings
    config_dir = get_storage_service().settings_service.settings.config_dir
    if config_dir is None:
        msg = "Config dir is not set in the settings"
        raise ValueError(msg)

    # Setup source and target paths
    origin = anyio.Path(__file__).parent / "profile_pictures"
    target = anyio.Path(config_dir) / "profile_pictures"

    if not await origin.exists():
        msg = f"The source folder '{origin}' does not exist."
        raise ValueError(msg)

    # Create target dir if needed
    if not await target.exists():
        await target.mkdir(parents=True, exist_ok=True)

    try:
        # Get set of existing files in target to avoid redundant checks
        target_files = {str(f.relative_to(target)) async for f in target.rglob("*") if await f.is_file()}

        # Define a helper coroutine to copy a single file concurrently
        async def copy_file(src_file, dst_file, rel_path):
            # Create parent directories if needed
            await dst_file.parent.mkdir(parents=True, exist_ok=True)
            # Offload blocking I/O to a thread
            await asyncio.to_thread(shutil.copy2, str(src_file), str(dst_file))
            await logger.adebug(f"Copied file '{rel_path}'")

        tasks = []
        async for src_file in origin.rglob("*"):
            if not await src_file.is_file():
                continue

            rel_path = src_file.relative_to(origin)
            if str(rel_path) not in target_files:
                dst_file = target / rel_path
                tasks.append(copy_file(src_file, dst_file, rel_path))

        if tasks:
            await asyncio.gather(*tasks)

    except Exception as exc:
        await logger.aexception("Error copying profile pictures")
        msg = "An error occurred while copying profile pictures."
        raise RuntimeError(msg) from exc


def get_project_data(project):
    project_name = project.get("name")
    project_description = project.get("description")
    project_is_component = project.get("is_component")
    project_updated_at = project.get("updated_at")
    if not project_updated_at:
        updated_at_datetime = datetime.now(tz=timezone.utc)
    else:
        updated_at_datetime = datetime.fromisoformat(project_updated_at)
    project_data = project.get("data")
    project_icon = project.get("icon")
    project_icon = demojize(project_icon) if project_icon and purely_emoji(project_icon) else project_icon
    project_icon_bg_color = project.get("icon_bg_color")
    project_gradient = project.get("gradient")
    project_tags = project.get("tags")
    return (
        project_name,
        project_description,
        project_is_component,
        updated_at_datetime,
        project_data,
        project_icon,
        project_icon_bg_color,
        project_gradient,
        project_tags,
    )


async def update_project_file(project_path: anyio.Path, project: dict, updated_project_data) -> None:
    """Update starter project JSON file with new data.

    This function attempts to write updated project data back to the source file.
    In containerized environments with read-only filesystems (e.g., Kubernetes with
    readOnlyRootFilesystem: true), the write will fail gracefully since the database
    is the source of truth for project data.

    Args:
        project_path: Path to the project JSON file
        project: Project dictionary to update
        updated_project_data: New project data to write
    """
    project["data"] = updated_project_data
    try:
        async with aiofiles.open(str(project_path), "w", encoding="utf-8") as f:
            await f.write(orjson.dumps(project, option=ORJSON_OPTIONS).decode())
        await logger.adebug(f"Updated starter project {project['name']} file")
    except OSError as e:
        # Handle read-only filesystem (common in containerized environments)
        # The database update is the important part - file updates are optional
        await logger.adebug(
            f"Could not update starter project file {project['name']} (read-only filesystem): {e}. "
            "This is expected in containerized environments with read-only root filesystem."
        )


def update_existing_project(
    existing_project,
    project_name,
    project_description,
    project_is_component,
    updated_at_datetime,
    project_data,
    project_icon,
    project_icon_bg_color,
) -> None:
    logger.info(f"Updating starter project {project_name}")
    existing_project.data = project_data
    existing_project.folder = STARTER_FOLDER_NAME
    existing_project.description = project_description
    existing_project.is_component = project_is_component
    existing_project.updated_at = updated_at_datetime
    existing_project.icon = project_icon
    existing_project.icon_bg_color = project_icon_bg_color


def create_new_project(
    session,
    project_name,
    project_description,
    project_is_component,
    updated_at_datetime,
    project_data,
    project_gradient,
    project_tags,
    project_icon,
    project_icon_bg_color,
    new_folder_id,
) -> None:
    new_project = FlowCreate(
        name=project_name,
        description=project_description,
        icon=project_icon,
        icon_bg_color=project_icon_bg_color,
        data=project_data,
        is_component=project_is_component,
        updated_at=updated_at_datetime,
        folder_id=new_folder_id,
        gradient=project_gradient,
        tags=project_tags,
    )
    db_flow = Flow.model_validate(new_project.model_dump(exclude={"id"}))
    session.add(db_flow)


async def get_all_flows_similar_to_project(session: AsyncSession, folder_id: UUID) -> list[Flow]:
    stmt = select(Folder).options(selectinload(Folder.flows)).where(Folder.id == folder_id)
    return list((await session.exec(stmt)).first().flows)


async def delete_starter_projects(session, folder_id) -> None:
    flows = await get_all_flows_similar_to_project(session, folder_id)
    for flow in flows:
        await session.delete(flow)


async def folder_exists(session, folder_name):
    stmt = select(Folder).where(Folder.name == folder_name)
    folder = (await session.exec(stmt)).first()
    return folder is not None


async def get_or_create_starter_folder(session):
    if not await folder_exists(session, STARTER_FOLDER_NAME):
        new_folder = FolderCreate(name=STARTER_FOLDER_NAME, description=STARTER_FOLDER_DESCRIPTION)
        db_folder = Folder.model_validate(new_folder, from_attributes=True)
        session.add(db_folder)
        await session.flush()
        await session.refresh(db_folder)
        return db_folder
    stmt = select(Folder).where(Folder.name == STARTER_FOLDER_NAME)
    return (await session.exec(stmt)).first()


async def get_or_create_assistant_folder(session, user_id: UUID):
    """Create or get the Langflow Assistant folder for a specific user.

    This folder contains agentic flows and cannot be deleted.

    Args:
        session: Database session
        user_id: The ID of the user who owns the folder

    Returns:
        The Langflow Assistant folder
    """
    stmt = select(Folder).where(Folder.user_id == user_id, Folder.name == ASSISTANT_FOLDER_NAME)
    result = await session.exec(stmt)
    folder = result.first()

    if not folder:
        new_folder = FolderCreate(name=ASSISTANT_FOLDER_NAME, description=ASSISTANT_FOLDER_DESCRIPTION)
        db_folder = Folder.model_validate(new_folder, from_attributes=True)
        db_folder.user_id = user_id
        session.add(db_folder)
        await session.commit()
        await session.refresh(db_folder)
        return db_folder
    return folder


async def load_agentic_flows() -> list[tuple[anyio.Path, dict]]:
    """Load agentic flows from the agentic/flows directory.

    Returns:
        List of tuples containing (file_path, flow_data)
    """
    agentic_flows: list[tuple[anyio.Path, dict]] = []
    # Get the path to the agentic/flows directory
    folder = anyio.Path(__file__).parent.parent / "agentic" / "flows"

    if not await folder.exists():
        await logger.adebug(f"Agentic flows directory does not exist: {folder}")
        return agentic_flows

    await logger.adebug("Loading agentic flows")
    async for file in folder.glob("*.json"):
        try:
            async with aiofiles.open(str(file), encoding="utf-8") as f:
                content = await f.read()
            flow = orjson.loads(content)
            agentic_flows.append((file, flow))
            await logger.adebug(f"Loaded agentic flow: {file.name}")
        except (OSError, orjson.JSONDecodeError) as e:
            await logger.aexception(f"Error loading agentic flow {file}: {e}")

    await logger.adebug(f"Loaded {len(agentic_flows)} agentic flows")
    return agentic_flows


async def create_or_update_agentic_flows(session: AsyncSession, user_id: UUID) -> None:
    """Create or update agentic flows in the Langflow Assistant folder for a user.

    This function is called on user login to ensure that all agentic flows
    are present and up-to-date in the user's Langflow Assistant folder.

    The function will:
    - Extract flow_id and endpoint_name from the JSON
    - Skip updates if flow already exists (only create new flows)
    - Create new flows if they don't exist

    Args:
        session: Database session
        user_id: The ID of the user
    """
    from lfx.services.deps import get_settings_service

    # Only configure if agentic experience is enabled
    settings_service = get_settings_service()
    if not settings_service.settings.agentic_experience:
        await logger.adebug("Agentic experience disabled, skipping agentic flows creation")
        return

    try:
        # Get or create the Langflow Assistant folder
        assistant_folder = await get_or_create_assistant_folder(session, user_id)

        # Load all agentic flows from the directory
        agentic_flows = await load_agentic_flows()

        if not agentic_flows:
            await logger.adebug("No agentic flows found to load")
            return

        flows_created = 0
        flows_updated = 0

        for _, flow_data in agentic_flows:
            # Extract flow metadata from JSON
            (
                flow_name,
                flow_description,
                flow_is_component,
                updated_at_datetime,
                project_data,
                flow_icon,
                flow_icon_bg_color,
                flow_gradient,
                flow_tags,
            ) = get_project_data(flow_data)

            # Extract flow_id and endpoint_name from JSON
            flow_id = flow_data.get("id")
            flow_endpoint_name = flow_data.get("endpoint_name")

            # Convert flow_id to UUID if it's a valid UUID string
            if flow_id and isinstance(flow_id, str):
                try:
                    flow_id = UUID(flow_id)
                except ValueError:
                    await logger.awarning(f"Invalid UUID for flow {flow_name}: {flow_id}, will use auto-generated ID")
                    flow_id = None

            # Try to find an existing flow by ID or endpoint_name
            existing_flow = await find_existing_flow(session, flow_id, flow_endpoint_name)

            if existing_flow:
                # Skip update if flow already exists
                await logger.adebug(f"Agentic flow already exists, skipping: {flow_name}")
                flows_updated += 1
            else:
                try:
                    await logger.adebug(f"Creating agentic flow: {flow_name}")
                    # Create new flow with ID and endpoint_name from JSON
                    new_project = FlowCreate(
                        name=flow_name,
                        description=flow_description,
                        icon=flow_icon,
                        icon_bg_color=flow_icon_bg_color,
                        data=project_data,
                        is_component=flow_is_component,
                        updated_at=updated_at_datetime,
                        folder_id=assistant_folder.id,
                        gradient=flow_gradient,
                        tags=flow_tags,
                        endpoint_name=flow_endpoint_name,  # Set endpoint_name from JSON
                    )
                    db_flow = Flow.model_validate(new_project.model_dump(exclude={"id"}))

                    # Set the ID from JSON if provided
                    if flow_id:
                        db_flow.id = flow_id

                    session.add(db_flow)
                    flows_created += 1
                except Exception:  # noqa: BLE001
                    await logger.aexception(f"Error while creating agentic flow {flow_name}")

        if flows_created > 0 or flows_updated > 0:
            await session.commit()
            await logger.adebug(
                f"Successfully created {flows_created} and skipped {flows_updated} existing agentic flows"
            )
        else:
            await logger.adebug("No agentic flows to create")

    except Exception:  # noqa: BLE001
        await logger.aexception("Error in create_or_update_agentic_flows")


def _is_valid_uuid(val):
    try:
        uuid_obj = UUID(val)
    except ValueError:
        return False
    return str(uuid_obj) == val


async def load_flows_from_directory() -> None:
    """On langflow startup, this loads all flows from the directory specified in the settings.

    All flows are uploaded into the default folder for the superuser.
    """
    settings_service = get_settings_service()
    flows_path = settings_service.settings.load_flows_path
    if not flows_path:
        return

    async with session_scope() as session:
        # Find superuser by role instead of username to avoid issues with credential reset
        from langflow.services.database.models.user.model import User

        stmt = select(User).where(User.is_superuser == True)  # noqa: E712
        result = await session.exec(stmt)
        user = result.first()
        if user is None:
            msg = "No superuser found in the database"
            raise NoResultFound(msg)

        # Ensure that the default folder exists for this user
        _ = await get_or_create_default_folder(session, user.id)

        for file_path in await asyncio.to_thread(Path(flows_path).iterdir):
            if not await anyio.Path(file_path).is_file() or file_path.suffix != ".json":
                continue
            await logger.ainfo(f"Loading flow from file: {file_path.name}")
            async with aiofiles.open(str(file_path), encoding="utf-8") as f:
                content = await f.read()
            await upsert_flow_from_file(content, file_path.stem, session, user.id)


async def detect_github_url(url: str) -> str:
    if matched := re.match(r"https?://(?:www\.)?github\.com/([\w.-]+)/([\w.-]+)?/?$", url):
        owner, repo = matched.groups()

        repo = repo.removesuffix(".git")

        async with httpx.AsyncClient(follow_redirects=True) as client:
            response = await client.get(f"https://api.github.com/repos/{owner}/{repo}")
            response.raise_for_status()
            default_branch = response.json().get("default_branch")
            return f"https://github.com/{owner}/{repo}/archive/refs/heads/{default_branch}.zip"

    if matched := re.match(r"https?://(?:www\.)?github\.com/([\w.-]+)/([\w.-]+)/tree/([\w\\/.-]+)", url):
        owner, repo, branch = matched.groups()
        if branch[-1] == "/":
            branch = branch[:-1]
        return f"https://github.com/{owner}/{repo}/archive/refs/heads/{branch}.zip"

    if matched := re.match(r"https?://(?:www\.)?github\.com/([\w.-]+)/([\w.-]+)/releases/tag/([\w\\/.-]+)", url):
        owner, repo, tag = matched.groups()
        if tag[-1] == "/":
            tag = tag[:-1]
        return f"https://github.com/{owner}/{repo}/archive/refs/tags/{tag}.zip"

    if matched := re.match(r"https?://(?:www\.)?github\.com/([\w.-]+)/([\w.-]+)/commit/(\w+)/?$", url):
        owner, repo, commit = matched.groups()
        return f"https://github.com/{owner}/{repo}/archive/{commit}.zip"

    return url


async def load_bundles_from_urls() -> tuple[list[TemporaryDirectory], list[str]]:
    component_paths: set[str] = set()
    temp_dirs = []
    settings_service = get_settings_service()
    bundle_urls = settings_service.settings.bundle_urls
    if not bundle_urls:
        return [], []

    async with session_scope() as session:
        # Find superuser by role instead of username to avoid issues with credential reset
        from langflow.services.database.models.user.model import User

        stmt = select(User).where(User.is_superuser == True)  # noqa: E712
        result = await session.exec(stmt)
        user = result.first()
        if user is None:
            msg = "No superuser found in the database"
            raise NoResultFound(msg)
        user_id = user.id

        for url in bundle_urls:
            url_ = await detect_github_url(url)

            async with httpx.AsyncClient(follow_redirects=True) as client:
                response = await client.get(url_)
                response.raise_for_status()

            with zipfile.ZipFile(io.BytesIO(response.content)) as zfile:
                dir_names = [f.filename for f in zfile.infolist() if f.is_dir() and "/" not in f.filename[:-1]]
                temp_dir = None
                for filename in zfile.namelist():
                    path = Path(filename)
                    for dir_name in dir_names:
                        if path.is_relative_to(f"{dir_name}flows/") and path.suffix == ".json":
                            file_content = zfile.read(filename)
                            await upsert_flow_from_file(file_content, path.stem, session, user_id)
                        elif path.is_relative_to(f"{dir_name}components/"):
                            if temp_dir is None:
                                temp_dir = await asyncio.to_thread(TemporaryDirectory)
                                temp_dirs.append(temp_dir)
                            component_paths.add(str(Path(temp_dir.name) / f"{dir_name}components"))
                            await asyncio.to_thread(zfile.extract, filename, temp_dir.name)

    return temp_dirs, list(component_paths)


async def upsert_flow_from_file(file_content: AnyStr, filename: str, session: AsyncSession, user_id: UUID) -> None:
    flow = orjson.loads(file_content)
    flow_endpoint_name = flow.get("endpoint_name")
    if _is_valid_uuid(filename):
        flow["id"] = filename
    flow_id = flow.get("id")

    if isinstance(flow_id, str):
        try:
            flow_id = UUID(flow_id)
        except ValueError:
            await logger.aerror(f"Invalid UUID string: {flow_id}")
            return

    existing = await find_existing_flow(session, flow_id, flow_endpoint_name)
    if existing:
        await logger.adebug(f"Found existing flow: {existing.name}")
        await logger.ainfo(f"Updating existing flow: {flow_id} with endpoint name {flow_endpoint_name}")
        for key, value in flow.items():
            if hasattr(existing, key):
                # flow dict from json and db representation are not 100% the same
                setattr(existing, key, value)
        existing.updated_at = datetime.now(tz=timezone.utc).astimezone()
        existing.user_id = user_id

        # Ensure that the flow is associated with an existing default folder
        if existing.folder_id is None:
            folder = await get_or_create_default_folder(session, user_id)
            existing.folder_id = folder.id

        if isinstance(existing.id, str):
            try:
                existing.id = UUID(existing.id)
            except ValueError:
                await logger.aerror(f"Invalid UUID string: {existing.id}")
                return

        session.add(existing)
    else:
        await logger.ainfo(f"Creating new flow: {flow_id} with endpoint name {flow_endpoint_name}")

        # Assign the newly created flow to the default folder
        folder = await get_or_create_default_folder(session, user_id)
        flow["user_id"] = user_id
        flow["folder_id"] = folder.id
        flow = Flow.model_validate(flow)
        flow.updated_at = datetime.now(tz=timezone.utc).astimezone()

        session.add(flow)


async def find_existing_flow(session, flow_id, flow_endpoint_name):
    if flow_endpoint_name:
        await logger.adebug(f"flow_endpoint_name: {flow_endpoint_name}")
        stmt = select(Flow).where(Flow.endpoint_name == flow_endpoint_name)
        if existing := (await session.exec(stmt)).first():
            await logger.adebug(f"Found existing flow by endpoint name: {existing.name}")
            return existing

    stmt = select(Flow).where(Flow.id == flow_id)
    if existing := (await session.exec(stmt)).first():
        await logger.adebug(f"Found existing flow by id: {flow_id}")
        return existing
    return None


async def create_or_update_starter_projects(all_types_dict: dict) -> None:
    """Create or update starter projects.

    Args:
        all_types_dict (dict): Dictionary containing all component types and their templates
    """
    if not get_settings_service().settings.create_starter_projects:
        # no-op for environments that don't want to create starter projects.
        # note that this doesn't check if the starter projects are already loaded in the db;
        # this is intended to be used to skip all startup project logic.
        return

    async with session_scope() as session:
        new_folder = await get_or_create_starter_folder(session)
        starter_projects = await load_starter_projects()

        if get_settings_service().settings.update_starter_projects:
            await logger.adebug("Updating starter projects")
            # 1. Delete all existing starter projects
            successfully_updated_projects = 0
            await delete_starter_projects(session, new_folder.id)
            # Profile pictures are now served directly from the package installation directory
            # No need to copy them to config_dir

            # 2. Update all starter projects with the latest component versions (this modifies the actual file data)
            for project_path, project in starter_projects:
                (
                    project_name,
                    project_description,
                    project_is_component,
                    updated_at_datetime,
                    project_data,
                    project_icon,
                    project_icon_bg_color,
                    project_gradient,
                    project_tags,
                ) = get_project_data(project)
                updated_project_data = update_projects_components_with_latest_component_versions(
                    project_data.copy(), all_types_dict
                )
                updated_project_data = update_edges_with_latest_component_versions(updated_project_data)
                if updated_project_data != project_data:
                    project_data = updated_project_data
                    await update_project_file(project_path, project, updated_project_data)

                try:
                    # Create the updated starter project
                    create_new_project(
                        session=session,
                        project_name=project_name,
                        project_description=project_description,
                        project_is_component=project_is_component,
                        updated_at_datetime=updated_at_datetime,
                        project_data=project_data,
                        project_icon=project_icon,
                        project_icon_bg_color=project_icon_bg_color,
                        project_gradient=project_gradient,
                        project_tags=project_tags,
                        new_folder_id=new_folder.id,
                    )
                except Exception:  # noqa: BLE001
                    await logger.aexception(f"Error while creating starter project {project_name}")

                successfully_updated_projects += 1
            await logger.adebug(f"Successfully updated {successfully_updated_projects} starter projects")
        else:
            # Even if we're not updating starter projects, we still need to create any that don't exist
            await logger.adebug("Creating new starter projects")
            successfully_created_projects = 0
            existing_flows = await get_all_flows_similar_to_project(session, new_folder.id)
            existing_flow_names = [existing_flow.name for existing_flow in existing_flows]
            for _, project in starter_projects:
                (
                    project_name,
                    project_description,
                    project_is_component,
                    updated_at_datetime,
                    project_data,
                    project_icon,
                    project_icon_bg_color,
                    project_gradient,
                    project_tags,
                ) = get_project_data(project)
                if project_name not in existing_flow_names:
                    try:
                        create_new_project(
                            session=session,
                            project_name=project_name,
                            project_description=project_description,
                            project_is_component=project_is_component,
                            updated_at_datetime=updated_at_datetime,
                            project_data=project_data,
                            project_icon=project_icon,
                            project_icon_bg_color=project_icon_bg_color,
                            project_gradient=project_gradient,
                            project_tags=project_tags,
                            new_folder_id=new_folder.id,
                        )
                    except Exception:  # noqa: BLE001
                        await logger.aexception(f"Error while creating starter project {project_name}")
                    successfully_created_projects += 1
                await logger.adebug(f"Successfully created {successfully_created_projects} starter projects")


async def initialize_auto_login_default_superuser() -> None:
    settings_service = get_settings_service()
    if not settings_service.auth_settings.AUTO_LOGIN:
        return
    # In AUTO_LOGIN mode, always use the default credentials for initial bootstrapping
    # without persisting the password in memory after setup.
    from lfx.services.settings.constants import DEFAULT_SUPERUSER, DEFAULT_SUPERUSER_PASSWORD

    username = DEFAULT_SUPERUSER
    password = DEFAULT_SUPERUSER_PASSWORD.get_secret_value()
    if not username or not password:
        msg = "SUPERUSER and SUPERUSER_PASSWORD must be set in the settings if AUTO_LOGIN is true."
        raise ValueError(msg)

    async with session_scope() as async_session:
        super_user = await get_auth_service().create_super_user(username, password, db=async_session)
        await get_variable_service().initialize_user_variables(super_user.id, async_session)
        # Initialize agentic variables if agentic experience is enabled
        from langflow.api.utils.mcp.agentic_mcp import initialize_agentic_user_variables

        if get_settings_service().settings.agentic_experience:
            await initialize_agentic_user_variables(super_user.id, async_session)
        _ = await get_or_create_default_folder(async_session, super_user.id)
    await logger.adebug("Super user initialized")


async def get_or_create_default_folder(session: AsyncSession, user_id: UUID) -> FolderRead:
    """Ensure the default folder exists for the given user_id. If it doesn't exist, create it.

    Uses an idempotent insertion approach to handle concurrent creation gracefully.

    If the DEFAULT_FOLDER_NAME env var is set to a custom value (e.g., "OpenRAG"), this function
    will check for legacy folder names and migrate them to avoid duplicates.

    This implementation avoids an external distributed lock and works with both SQLite and PostgreSQL.

    Args:
        session (AsyncSession): The active database session.
        user_id (UUID): The ID of the user who owns the folder.

    Returns:
        FolderRead: The default folder for the user.
    """
    # First, check if the current default folder exists
    stmt = select(Folder).where(Folder.user_id == user_id, Folder.name == DEFAULT_FOLDER_NAME)
    result = await session.exec(stmt)
    folder = result.first()
    if folder:
        return FolderRead.model_validate(folder, from_attributes=True)

    # Check if a legacy folder exists and migrate it if the name is different from default
    if DEFAULT_FOLDER_NAME not in LEGACY_FOLDER_NAMES:
        for legacy_name in LEGACY_FOLDER_NAMES:
            if legacy_name == DEFAULT_FOLDER_NAME:
                continue  # Skip if legacy name is the same as current default

            legacy_stmt = select(Folder).where(Folder.user_id == user_id, Folder.name == legacy_name)
            legacy_result = await session.exec(legacy_stmt)
            legacy_folder = legacy_result.first()

            if legacy_folder:
                # Migrate the legacy folder by renaming it
                await logger.ainfo(
                    f"Migrating legacy folder '{legacy_name}' to '{DEFAULT_FOLDER_NAME}' for user {user_id}"
                )
                legacy_folder.name = DEFAULT_FOLDER_NAME
                legacy_folder.description = DEFAULT_FOLDER_DESCRIPTION
                session.add(legacy_folder)
                try:
                    await session.flush()
                    await session.refresh(legacy_folder)
                    return FolderRead.model_validate(legacy_folder, from_attributes=True)
                except sa.exc.IntegrityError:
                    # If there's a conflict, rollback and proceed to create new folder
                    await session.rollback()
                    break

    # If no existing folder found, create a new one
    try:
        folder_obj = Folder(user_id=user_id, name=DEFAULT_FOLDER_NAME, description=DEFAULT_FOLDER_DESCRIPTION)
        session.add(folder_obj)
        await session.flush()
        await session.refresh(folder_obj)
    except sa.exc.IntegrityError as e:
        # Another worker may have created the folder concurrently.
        await session.rollback()
        result = await session.exec(stmt)
        folder = result.first()
        if folder:
            return FolderRead.model_validate(folder, from_attributes=True)
        msg = "Failed to get or create default folder"
        raise ValueError(msg) from e
    return FolderRead.model_validate(folder_obj, from_attributes=True)


async def sync_flows_from_fs():
    flow_mtimes = {}
    fs_flows_polling_interval = get_settings_service().settings.fs_flows_polling_interval / 1000
    storage_service = get_storage_service()
    try:
        while True:
            try:
                async with session_scope() as session:
                    stmt = select(Flow).where(col(Flow.fs_path).is_not(None))
                    flows = (await session.exec(stmt)).all()
                    for flow in flows:
                        mtime = flow_mtimes.setdefault(flow.id, 0)
                        # Resolve path: if relative, construct full path using user's flows directory
                        fs_path_str = flow.fs_path
                        if not Path(fs_path_str).is_absolute():
                            # Relative path - construct full path
                            path = storage_service.data_dir / "flows" / str(flow.user_id) / fs_path_str
                        else:
                            # Absolute path - use as-is
                            path = anyio.Path(fs_path_str)
                        try:
                            if await path.exists():
                                new_mtime = (await path.stat()).st_mtime
                                if new_mtime > mtime:
                                    update_data = orjson.loads(await path.read_text(encoding="utf-8"))
                                    try:
                                        for field_name in ("name", "description", "data", "locked"):
                                            if new_value := update_data.get(field_name):
                                                setattr(flow, field_name, new_value)
                                        if folder_id := update_data.get("folder_id"):
                                            flow.folder_id = UUID(folder_id)
                                        await session.flush()
                                        await session.refresh(flow)
                                    except Exception:  # noqa: BLE001
                                        await logger.aexception(
                                            f"Couldn't update flow {flow.id} in database from path {path}"
                                        )
                                    flow_mtimes[flow.id] = new_mtime
                        except Exception:  # noqa: BLE001
                            await logger.aexception(f"Error while handling flow file {path}")
            except asyncio.CancelledError:
                await logger.adebug("Flow sync cancelled")
                break
            except (sa.exc.OperationalError, ValueError) as e:
                if "no active connection" in str(e) or "connection is closed" in str(e):
                    await logger.adebug("Database connection lost, assuming shutdown")
                    break  # Exit gracefully, don't error
                raise  # Re-raise if it's a real connection problem
            except Exception:  # noqa: BLE001
                await logger.aexception("Error while syncing flows from database")
                break

            await asyncio.sleep(fs_flows_polling_interval)
    except asyncio.CancelledError:
        await logger.adebug("Flow sync task cancelled")
