import Fastify from "fastify";
import fastifyCookie from "@fastify/cookie";
import fastifyCors from "@fastify/cors";
import fastifyHelmet from "@fastify/helmet";
import fastifyRateLimit from "@fastify/rate-limit";
import fastifyWebsocket from "@fastify/websocket";
import passport from "passport";
import { config } from "./config/index.js";
import { connectDatabase } from "./config/database.js";
import { configurePassport } from "./config/passport.js";
import { wsManager } from "./utils/websocket.js";

// Import middleware
import { checkMaintenance } from "./middleware/maintenance.js";

// Import routes
import authRoutes from "./routes/auth.js";
import userRoutes from "./routes/user.js";
import websocketRoutes from "./routes/websocket.js";
import marketRoutes from "./routes/market.js";
import inventoryRoutes from "./routes/inventory.js";
import adminRoutes from "./routes/admin.js";
import adminManagementRoutes from "./routes/admin-management.js";
import configRoutes from "./routes/config.js";

// Import services
import pricingService from "./services/pricing.js";
import { getSteamBotManager } from "./services/steamBot.js";

// Import models
import User from "./models/User.js";
import Trade from "./models/Trade.js";
import Transaction from "./models/Transaction.js";

/**
 * Create and configure Fastify server
 */
const createServer = () => {
  const fastify = Fastify({
    logger: {
      level: config.isDevelopment ? "info" : "warn",
      transport: config.isDevelopment
        ? {
            target: "pino-pretty",
            options: {
              translateTime: "HH:MM:ss Z",
              ignore: "pid,hostname",
            },
          }
        : undefined,
    },
    trustProxy: true,
    requestIdHeader: "x-request-id",
    requestIdLogLabel: "reqId",
  });

  return fastify;
};

/**
 * Register plugins
 */
const registerPlugins = async (fastify) => {
  // CORS - Allow both local development and production
  await fastify.register(fastifyCors, {
    origin: (origin, callback) => {
      const allowedOrigins = [
        "http://localhost:5173",
        "http://127.0.0.1:5173",
        "https://turbotrades.dev",
        "https://www.turbotrades.dev",
        config.cors.origin,
      ];

      // Allow requests from file:// protocol (local HTML files)
      if (!origin || origin === "null") {
        callback(null, true);
        return;
      }

      // Allow localhost on any port in development
      if (config.isDevelopment && origin.includes("localhost")) {
        callback(null, true);
        return;
      }

      // Check if origin is in allowed list
      if (allowedOrigins.includes(origin)) {
        callback(null, true);
      } else {
        callback(new Error("Not allowed by CORS"), false);
      }
    },
    preflightContinue: true,
    credentials: true,
    methods: ["GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS", "HEAD"],
    allowedHeaders: [
      "Content-Type",
      "Authorization",
      "Cookie",
      "X-Requested-With",
      "Accept",
    ],
    exposedHeaders: ["Set-Cookie", "Content-Type"],
    preflight: true,
    preflightContinue: false,
    optionsSuccessStatus: 204,
    maxAge: 86400, // Cache preflight requests for 24 hours
  });

  // Skip CORS for WebSocket connections
  fastify.addHook("preHandler", async (request, reply) => {
    // Allow WebSocket upgrade requests from any origin
    if (request.raw.headers.upgrade === "websocket") {
      reply.header(
        "Access-Control-Allow-Origin",
        request.headers.origin || "*"
      );
      reply.header("Access-Control-Allow-Credentials", "true");
    }
  });

  // Security headers
  await fastify.register(fastifyHelmet, {
    contentSecurityPolicy: config.isProduction,
    global: true,
  });

  // Cookies - Don't sign cookies, just parse them
  await fastify.register(fastifyCookie, {
    secret: config.session.secret,
    parseOptions: {
      httpOnly: true,
      secure: config.cookie.secure,
      sameSite: config.cookie.sameSite,
      path: "/",
    },
    hook: "onRequest", // Parse cookies on every request
  });

  // Rate limiting
  await fastify.register(fastifyRateLimit, {
    max: config.rateLimit.max,
    timeWindow: config.rateLimit.timeWindow,
    cache: 10000,
    allowList: config.isDevelopment ? ["127.0.0.1", "localhost"] : [],
    redis: null, // TODO: Add Redis for distributed rate limiting
    skipOnError: true,
  });

  // WebSocket support
  await fastify.register(fastifyWebsocket, {
    options: {
      maxPayload: config.websocket.maxPayload,
      verifyClient: (info, next) => {
        // Can add additional WebSocket verification logic here
        next(true);
      },
    },
  });

  // Passport for Steam authentication
  fastify.decorate("passport", passport);
  configurePassport();

  console.log("✅ All plugins registered");

  // Debug hook to log cookies on every request (development only)
  if (config.isDevelopment) {
    fastify.addHook("onRequest", async (request, reply) => {
      if (request.url.includes("/user/") || request.url.includes("/auth/")) {
        console.log(`\n🔍 Incoming ${request.method} ${request.url}`);
        console.log(
          "   Cookies:",
          Object.keys(request.cookies || {}).join(", ") || "NONE"
        );
        console.log("   Has accessToken:", !!request.cookies?.accessToken);
        console.log("   Origin:", request.headers.origin);
        console.log("   Host:", request.headers.host);
      }
    });
  }
};

/**
 * Setup routes
 */
const registerRoutes = async (fastify) => {
  // Health check (both with and without /api prefix)
  fastify.get("/health", async (request, reply) => {
    return {
      status: "ok",
      timestamp: Date.now(),
      uptime: process.uptime(),
      environment: config.nodeEnv,
    };
  });

  fastify.get("/api/health", async (request, reply) => {
    return {
      status: "ok",
      timestamp: Date.now(),
      uptime: process.uptime(),
      environment: config.nodeEnv,
    };
  });

  // Root endpoint
  fastify.get("/", async (request, reply) => {
    return {
      name: "TurboTrades API",
      version: "1.0.0",
      environment: config.nodeEnv,
      endpoints: {
        health: "/api/health",
        auth: "/api/auth/*",
        user: "/api/user/*",
        websocket: "/ws",
        market: "/api/market/*",
      },
    };
  });

  // Debug endpoint - list all registered routes (development only)
  fastify.get("/api/routes", async (request, reply) => {
    if (config.isProduction) {
      return reply.status(404).send({ error: "Not found" });
    }

    // Get all routes using Fastify's print routes
    const routes = [];

    // Iterate through Fastify's internal routes
    for (const route of fastify.routes.values()) {
      routes.push({
        method: route.method,
        url: route.url,
        path: route.routePath || route.path,
      });
    }

    // Sort by URL
    routes.sort((a, b) => {
      const urlCompare = a.url.localeCompare(b.url);
      if (urlCompare !== 0) return urlCompare;
      return a.method.localeCompare(b.method);
    });

    return reply.send({
      success: true,
      count: routes.length,
      routes: routes,
      userRoutes: routes.filter((r) => r.url.startsWith("/user")),
      authRoutes: routes.filter((r) => r.url.startsWith("/auth")),
    });
  });

  // Register maintenance mode check globally (before routes)
  fastify.addHook("preHandler", checkMaintenance);

  // Register auth routes WITHOUT /api prefix for Steam OAuth (external callback)
  await fastify.register(authRoutes, { prefix: "/auth" });

  // Register auth routes WITH /api prefix for frontend calls
  await fastify.register(authRoutes, { prefix: "/api/auth" });

  // Register other routes with /api prefix
  await fastify.register(userRoutes, { prefix: "/api/user" });
  await fastify.register(websocketRoutes);
  await fastify.register(marketRoutes, { prefix: "/api/market" });
  await fastify.register(inventoryRoutes, { prefix: "/api/inventory" });
  await fastify.register(adminRoutes, { prefix: "/api/admin" });
  await fastify.register(adminManagementRoutes, { prefix: "/api/admin" });
  await fastify.register(configRoutes, { prefix: "/api/config" });

  console.log("✅ All routes registered");
  console.log("✅ Maintenance mode middleware active");
};

/**
 * Setup error handlers
 */
const setupErrorHandlers = (fastify) => {
  // Global error handler
  fastify.setErrorHandler((error, request, reply) => {
    fastify.log.error(error);

    // Validation errors
    if (error.validation) {
      return reply.status(400).send({
        error: "ValidationError",
        message: "Invalid request data",
        details: error.validation,
      });
    }

    // Rate limit errors
    if (error.statusCode === 429) {
      return reply.status(429).send({
        error: "TooManyRequests",
        message: "Rate limit exceeded. Please try again later.",
      });
    }

    // JWT errors
    if (error.message && error.message.includes("jwt")) {
      return reply.status(401).send({
        error: "Unauthorized",
        message: "Invalid or expired token",
      });
    }

    // Default error response
    const statusCode = error.statusCode || 500;
    return reply.status(statusCode).send({
      error: error.name || "InternalServerError",
      message:
        config.isProduction && statusCode === 500
          ? "An internal server error occurred"
          : error.message,
      ...(config.isDevelopment && { stack: error.stack }),
    });
  });

  // 404 handler
  fastify.setNotFoundHandler((request, reply) => {
    reply.status(404).send({
      error: "NotFound",
      message: `Route ${request.method} ${request.url} not found`,
    });
  });

  console.log("✅ Error handlers configured");
};

/**
 * Graceful shutdown handler
 */
const setupGracefulShutdown = (fastify) => {
  const signals = ["SIGINT", "SIGTERM"];

  signals.forEach((signal) => {
    process.on(signal, async () => {
      console.log(`\n🛑 Received ${signal}, starting graceful shutdown...`);

      try {
        // Close WebSocket connections
        wsManager.closeAll();

        // Close Fastify server
        await fastify.close();

        console.log("✅ Server closed gracefully");
        process.exit(0);
      } catch (error) {
        console.error("❌ Error during shutdown:", error);
        process.exit(1);
      }
    });
  });

  // Handle uncaught exceptions
  process.on("uncaughtException", (error) => {
    console.error("❌ Uncaught Exception:", error);
    process.exit(1);
  });

  // Handle unhandled promise rejections
  process.on("unhandledRejection", (reason, promise) => {
    console.error("❌ Unhandled Rejection at:", promise, "reason:", reason);
    process.exit(1);
  });

  console.log("✅ Graceful shutdown handlers configured");
};

/**
 * Start the server
 */
const start = async () => {
  try {
    console.log("🚀 Starting TurboTrades Backend...\n");

    // Connect to database
    await connectDatabase();

    // Create Fastify instance
    const fastify = createServer();

    // Add WebSocket manager to fastify instance
    fastify.decorate("websocketManager", wsManager);

    // Initialize Steam Bot Manager
    const botManager = getSteamBotManager();

    // Setup trade event listeners
    botManager.on("tradeAccepted", async (offer, tradeData) => {
      console.log(`✅ Trade ${offer.id} accepted! Crediting user...`);

      try {
        // Find the trade record
        const trade = await Trade.findOne({ offerId: offer.id });

        if (!trade) {
          console.error(`❌ Trade record not found for offer ${offer.id}`);
          return;
        }

        if (trade.state === "accepted") {
          console.log(`⚠️ Trade ${offer.id} already completed, skipping`);
          return;
        }

        // Find the user
        const user = await User.findById(trade.userId);

        if (!user) {
          console.error(`❌ User not found for trade ${offer.id}`);
          return;
        }

        // Credit user balance
        user.balance += trade.totalValue;
        await user.save();

        // Update trade status
        trade.state = "accepted";
        trade.completedAt = new Date();
        await trade.save();

        // Create transaction record
        const transaction = new Transaction({
          user: user._id,
          type: "sale",
          amount: trade.totalValue,
          description: `Sold ${trade.items.length} item(s)`,
          status: "completed",
          metadata: {
            tradeId: trade._id,
            offerId: offer.id,
            botId: tradeData.botId,
            itemCount: trade.items.length,
            verificationCode: trade.verificationCode,
          },
        });
        await transaction.save();

        console.log(
          `✅ Credited $${trade.totalValue.toFixed(2)} to user ${
            user.username
          } (Balance: $${user.balance.toFixed(2)})`
        );

        // Notify user via WebSocket
        wsManager.sendToUser(user.steamId, {
          type: "trade_completed",
          data: {
            tradeId: trade._id,
            offerId: offer.id,
            amount: trade.totalValue,
            newBalance: user.balance,
            itemCount: trade.items.length,
            timestamp: Date.now(),
          },
        });

        // Also send balance update
        wsManager.sendToUser(user.steamId, {
          type: "balance_update",
          data: {
            balance: user.balance,
            change: trade.totalValue,
            reason: "trade_completed",
          },
        });
      } catch (error) {
        console.error(`❌ Error processing accepted trade ${offer.id}:`, error);
      }
    });

    botManager.on("tradeDeclined", async (offer, tradeData) => {
      console.log(`❌ Trade ${offer.id} declined`);

      try {
        const trade = await Trade.findOne({ offerId: offer.id });

        if (trade && trade.state === "pending") {
          trade.state = "declined";
          trade.completedAt = new Date();
          await trade.save();

          // Notify user
          const user = await User.findById(trade.userId);
          if (user) {
            wsManager.sendToUser(user.steamId, {
              type: "trade_declined",
              data: {
                tradeId: trade._id,
                offerId: offer.id,
                timestamp: Date.now(),
              },
            });
          }
        }
      } catch (error) {
        console.error(`❌ Error processing declined trade ${offer.id}:`, error);
      }
    });

    botManager.on("tradeExpired", async (offer, tradeData) => {
      console.log(`⏰ Trade ${offer.id} expired`);

      try {
        const trade = await Trade.findOne({ offerId: offer.id });

        if (trade && trade.state === "pending") {
          trade.state = "expired";
          trade.completedAt = new Date();
          await trade.save();

          // Notify user
          const user = await User.findById(trade.userId);
          if (user) {
            wsManager.sendToUser(user.steamId, {
              type: "trade_expired",
              data: {
                tradeId: trade._id,
                offerId: offer.id,
                timestamp: Date.now(),
              },
            });
          }
        }
      } catch (error) {
        console.error(`❌ Error processing expired trade ${offer.id}:`, error);
      }
    });

    botManager.on("tradeCanceled", async (offer, tradeData) => {
      console.log(`🚫 Trade ${offer.id} canceled`);

      try {
        const trade = await Trade.findOne({ offerId: offer.id });

        if (trade && trade.state === "pending") {
          trade.state = "canceled";
          trade.completedAt = new Date();
          await trade.save();
        }
      } catch (error) {
        console.error(`❌ Error processing canceled trade ${offer.id}:`, error);
      }
    });

    botManager.on("botError", (error, botId) => {
      console.error(`❌ Bot ${botId} error:`, error);
    });

    // Initialize bots if config exists
    if (process.env.STEAM_BOT_AUTO_START === "true") {
      try {
        console.log("🤖 Auto-starting Steam bots...");
        // You can load bot config from file or env vars
        // const botsConfig = require("./config/steam-bots.json");
        // await botManager.initialize(botsConfig);
        console.log("⚠️ Bot auto-start enabled but no config found");
        console.log(
          "   Configure bots in config/steam-bots.json or via env vars"
        );
      } catch (error) {
        console.error("❌ Failed to initialize bots:", error.message);
      }
    } else {
      console.log(
        "🤖 Steam bots not auto-started (set STEAM_BOT_AUTO_START=true to enable)"
      );
    }

    // Register plugins
    await registerPlugins(fastify);

    // Register routes
    await registerRoutes(fastify);

    // Setup error handlers
    setupErrorHandlers(fastify);

    // Setup graceful shutdown
    setupGracefulShutdown(fastify);

    // Start WebSocket heartbeat
    wsManager.startHeartbeat(config.websocket.pingInterval);

    // Start automatic price updates (every 1 hour)
    if (!config.isDevelopment || process.env.ENABLE_PRICE_UPDATES === "true") {
      console.log("⏰ Starting automatic price update scheduler...");
      console.log("🔄 Running initial price update on startup...");

      // Force immediate price update on launch
      pricingService
        .updateAllPrices()
        .then((result) => {
          console.log("✅ Initial price update completed successfully");
          console.log("   📊 MarketPrice Reference Database:");
          console.log(
            `      CS2: ${
              result.marketPrices.cs2.updated || 0
            } prices updated, ${result.marketPrices.cs2.inserted || 0} new`
          );
          console.log(
            `      Rust: ${
              result.marketPrices.rust.updated || 0
            } prices updated, ${result.marketPrices.rust.inserted || 0} new`
          );
          console.log("   📦 Marketplace Items:");
          console.log(
            `      CS2: ${result.itemPrices.cs2.updated || 0} items updated`
          );
          console.log(
            `      Rust: ${result.itemPrices.rust.updated || 0} items updated`
          );
        })
        .catch((error) => {
          console.error("❌ Initial price update failed:", error.message);
          console.error("   Scheduled updates will continue normally");
        });

      // Schedule recurring updates every hour
      pricingService.scheduleUpdates(60 * 60 * 1000); // 1 hour
    } else {
      console.log("⏰ Automatic price updates disabled in development");
      console.log("   Set ENABLE_PRICE_UPDATES=true to enable");
    }

    // Start listening
    await fastify.listen({
      port: config.port,
      host: config.host,
    });

    console.log(`\n✅ Server running on http://${config.host}:${config.port}`);
    console.log(
      `📡 WebSocket available at ws://${config.host}:${config.port}/ws`
    );
    console.log(`🌍 Environment: ${config.nodeEnv}`);
    console.log(
      `🔐 Steam Login: http://${config.host}:${config.port}/auth/steam\n`
    );
  } catch (error) {
    console.error("❌ Failed to start server:", error);
    process.exit(1);
  }
};

// Start the server
start();