<?php

namespace App\Providers;

use App\Domain\Bridge\Services\BridgeRouter;
use App\Domain\Budget\Services\CostCalculator;
use App\Infrastructure\AI\Contracts\AiGatewayInterface;
use App\Infrastructure\AI\Gateways\FallbackAiGateway;
use App\Infrastructure\AI\Gateways\HttpBridgeGateway;
use App\Infrastructure\AI\Gateways\LocalAgentGateway;
use App\Infrastructure\AI\Gateways\LocalBridgeGateway;
use App\Infrastructure\AI\Gateways\PortkeyGateway;
use App\Infrastructure\AI\Gateways\PrismAiGateway;
use App\Infrastructure\AI\Middleware\BudgetEnforcement;
use App\Infrastructure\AI\Middleware\BudgetPressureRouting;
use App\Infrastructure\AI\Middleware\ContextCompaction;
use App\Infrastructure\AI\Middleware\IdempotencyCheck;
use App\Infrastructure\AI\Middleware\LangfuseExportMiddleware;
use App\Infrastructure\AI\Middleware\PhoenixExportMiddleware;
use App\Infrastructure\AI\Middleware\RateLimiting;
use App\Infrastructure\AI\Middleware\SchemaValidation;
use App\Infrastructure\AI\Middleware\SemanticCache;
use App\Infrastructure\AI\Middleware\SteeringInjection;
use App\Infrastructure\AI\Middleware\UsageTracking;
use App\Infrastructure\AI\Services\CircuitBreaker;
use App\Infrastructure\AI\Services\EscalationStrategy;
use App\Infrastructure\AI\Services\LocalAgentDiscovery;
use App\Infrastructure\AI\Services\LocalLlmDiscovery;
use App\Infrastructure\AI\Services\LocalLlmUrlValidator;
use App\Infrastructure\AI\Services\PhoenixTraceContext;
use App\Infrastructure\AI\Services\ProviderRanker;
use App\Infrastructure\Bridge\BridgeRequestRegistry;
use Illuminate\Support\ServiceProvider;
use Prism\Prism\PrismManager;
use Prism\Prism\Providers\OpenRouter\OpenRouter;

class AiServiceProvider extends ServiceProvider
{
    public function register(): void
    {
        $this->app->singleton(CostCalculator::class);
        $this->app->singleton(CircuitBreaker::class);
        $this->app->singleton(EscalationStrategy::class);
        $this->app->singleton(ProviderRanker::class);
        $this->app->singleton(LocalAgentDiscovery::class);
        $this->app->singleton(LocalLlmDiscovery::class);
        $this->app->singleton(LocalLlmUrlValidator::class);
        // Request/worker-scoped — holds the active root-span stack so nested
        // LLM calls land under the right parent. Resets between requests in
        // HTTP context; persists across jobs in a queue worker (the stack
        // drains via array_pop on every withRoot() exit).
        $this->app->singleton(PhoenixTraceContext::class);

        // Portkey gateway — instantiated per-team via PortkeyGateway constructor.
        // Named binding for direct resolution when a Portkey credential is available.
        $this->app->bind('ai.gateway.portkey', function ($app, array $params = []) {
            return new PortkeyGateway(
                apiKey: $params['api_key'] ?? '',
                virtualKey: $params['virtual_key'] ?? null,
            );
        });

        $this->app->singleton(LocalAgentGateway::class, function ($app) {
            return new LocalAgentGateway(
                discovery: $app->make(LocalAgentDiscovery::class),
            );
        });

        $this->app->singleton(PrismAiGateway::class, function ($app) {
            $gateway = new PrismAiGateway(
                costCalculator: $app->make(CostCalculator::class),
            );

            $middleware = [
                $app->make(RateLimiting::class),
                $app->make(BudgetPressureRouting::class),
                $app->make(BudgetEnforcement::class),
                $app->make(IdempotencyCheck::class),
                // SteeringInjection runs AFTER IdempotencyCheck so steering creates a new
                // cache key (we want the steering-influenced response, not a stale cached one)
                // but BEFORE SemanticCache for the same reason.
                $app->make(SteeringInjection::class),
                $app->make(SemanticCache::class),
                $app->make(ContextCompaction::class),
                $app->make(SchemaValidation::class),
                $app->make(UsageTracking::class),
                // Always registered — handles its own enabled check via GlobalSetting / env
                $app->make(LangfuseExportMiddleware::class),
                // Same pattern as Langfuse — opt-in via PHOENIX_OTLP_ENDPOINT, no-op when empty.
                $app->make(PhoenixExportMiddleware::class),
            ];

            return $gateway->withMiddleware($middleware);
        });

        $this->app->singleton(BridgeRequestRegistry::class);

        $this->app->singleton(HttpBridgeGateway::class, function ($app) {
            return new HttpBridgeGateway(
                router: $app->make(BridgeRouter::class),
            );
        });

        $this->app->singleton(LocalBridgeGateway::class, function ($app) {
            return new LocalBridgeGateway(
                registry: $app->make(BridgeRequestRegistry::class),
                router: $app->make(BridgeRouter::class),
                httpGateway: $app->make(HttpBridgeGateway::class),
            );
        });

        $this->app->singleton(AiGatewayInterface::class, function ($app) {
            return new FallbackAiGateway(
                gateway: $app->make(PrismAiGateway::class),
                circuitBreaker: $app->make(CircuitBreaker::class),
                fallbackChains: [
                    // Bridge agent — no fallback when bridge is down.
                    // Bridge agents require local tools (Playwright, filesystem, etc.) that cloud providers
                    // cannot access. Falling back to a cloud LLM causes hallucinated results, not a
                    // graceful degradation. Fail fast so the error is visible and actionable.
                    'bridge_agent/claude-code:claude-haiku-4-5' => [],
                    'bridge_agent/claude-code:claude-sonnet-4-5' => [],
                    'bridge_agent/claude-code:claude-opus-4-6' => [],
                    // Cloud provider fallbacks
                    'anthropic/claude-sonnet-4-5-20250929' => [
                        ['provider' => 'openai', 'model' => 'gpt-4o'],
                    ],
                    'openai/gpt-4o' => [
                        ['provider' => 'anthropic', 'model' => 'claude-sonnet-4-5-20250929'],
                    ],
                    'google/gemini-2.5-pro' => [
                        ['provider' => 'google', 'model' => 'gemini-2.5-flash'],
                    ],
                    'google/gemini-2.5-flash' => [
                        ['provider' => 'google', 'model' => 'gemini-2.5-pro'],
                    ],
                ],
                // Bind the LocalAgentGateway whenever local agents are enabled OR the
                // VPS-only Claude Code path has an OAuth token provisioned. The VPS
                // variant is a deliberately-scoped local-agent exception that must
                // remain reachable even when the generic local_agents kill switch is
                // off (cloud forces local_agents.enabled=false, then rebinds the
                // concrete gateway to DisabledLocalAgentGateway which only lets VPS
                // calls through).
                localGateway: (config('local_agents.enabled') || ! empty(config('local_agents.vps.oauth_token')))
                    ? $app->make(LocalAgentGateway::class)
                    : null,
                bridgeGateway: $app->make(LocalBridgeGateway::class),
                escalationStrategy: $app->make(EscalationStrategy::class),
                ranker: $app->make(ProviderRanker::class),
            );
        });
    }

    public function boot(): void
    {
        $appName = config('app.name', 'FleetQ');

        // Custom AI endpoints — always available (not gated by local_llm.enabled).
        // Backed by the OpenRouter driver which uses POST /v1/chat/completions.
        app(PrismManager::class)->extend('custom_endpoint', function ($app, array $config) use ($appName) {
            return new OpenRouter(
                apiKey: $config['api_key'] ?? '',
                url: rtrim($config['url'] ?? '', '/').'/',
                httpReferer: null,
                xTitle: $appName,
            );
        });

        // Perplexity — OpenAI-compatible endpoint (not natively in Prism's Provider enum yet).
        app(PrismManager::class)->extend('perplexity', function ($app, array $config) use ($appName) {
            return new OpenRouter(
                apiKey: $config['api_key'] ?? '',
                url: rtrim($config['url'] ?? 'https://api.perplexity.ai', '/').'/',
                httpReferer: null,
                xTitle: $appName,
            );
        });

        // Fireworks AI — OpenAI-compatible inference endpoint.
        app(PrismManager::class)->extend('fireworks', function ($app, array $config) use ($appName) {
            return new OpenRouter(
                apiKey: $config['api_key'] ?? '',
                url: rtrim($config['url'] ?? 'https://api.fireworks.ai/inference/v1', '/').'/',
                httpReferer: null,
                xTitle: $appName,
            );
        });

        // LiteLLM Proxy — self-hosted proxy that exposes an OpenAI-compatible endpoint
        // for 100+ providers (Bedrock, Vertex AI, Cohere, Together.ai, etc.).
        // Teams register their proxy base URL as a TeamProviderCredential with provider='litellm_proxy'.
        // See https://docs.litellm.ai/docs/proxy/quick_start
        app(PrismManager::class)->extend('litellm_proxy', function ($app, array $config) use ($appName) {
            return new OpenRouter(
                apiKey: $config['api_key'] ?? 'anything',
                url: rtrim($config['url'] ?? 'http://localhost:4000', '/').'/',
                httpReferer: null,
                xTitle: $appName,
            );
        });

        if (! config('local_llm.enabled', false)) {
            return;
        }

        // Register an OpenAI-compatible custom provider backed by the OpenRouter driver.
        // This lets any LM Studio, vLLM, llama.cpp server, or other OpenAI-compatible
        // endpoint work via the standard ->using('openai_compatible', $model, [...]) call.
        app(PrismManager::class)->extend('openai_compatible', function ($app, array $config) use ($appName) {
            return new OpenRouter(
                apiKey: $config['api_key'] ?? '',
                url: rtrim($config['url'] ?? 'http://localhost:1234/v1', '/').'/',
                httpReferer: null,
                xTitle: $appName,
            );
        });
    }
}
