import { generateTokenPair } from "../utils/jwt.js";
import {
  authenticate,
  verifyRefreshTokenMiddleware,
} from "../middleware/auth.js";
import { config } from "../config/index.js";
import Session from "../models/Session.js";

/**
 * Authentication routes
 * @param {FastifyInstance} fastify - Fastify instance
 */
export default async function authRoutes(fastify, options) {
  // Debug endpoint to check cookies and headers (development only)
  fastify.get("/debug-cookies", async (request, reply) => {
    if (config.isProduction) {
      return reply.status(404).send({ error: "Not found" });
    }

    // Parse the raw cookie header manually to compare
    const rawCookieHeader = request.headers.cookie || "";
    const manualParsedCookies = {};
    if (rawCookieHeader) {
      rawCookieHeader.split(";").forEach((cookie) => {
        const [name, ...valueParts] = cookie.trim().split("=");
        if (name) {
          manualParsedCookies[name] = valueParts.join("=");
        }
      });
    }

    return reply.send({
      success: true,
      cookies: request.cookies || {},
      manualParsedCookies: manualParsedCookies,
      rawCookieHeader: rawCookieHeader,
      headers: {
        authorization: request.headers.authorization || null,
        origin: request.headers.origin || null,
        referer: request.headers.referer || null,
        cookie: request.headers.cookie ? "Present" : "Missing",
        host: request.headers.host || null,
      },
      hasAccessToken: !!request.cookies?.accessToken,
      hasRefreshToken: !!request.cookies?.refreshToken,
      manualHasAccessToken: !!manualParsedCookies.accessToken,
      manualHasRefreshToken: !!manualParsedCookies.refreshToken,
      config: {
        cookieDomain: config.cookie.domain,
        cookieSecure: config.cookie.secure,
        cookieSameSite: config.cookie.sameSite,
        corsOrigin: config.cors.origin,
      },
      note: "If request.cookies is empty but manualParsedCookies has data, then @fastify/cookie isn't parsing correctly",
    });
  });

  // Test endpoint to verify Steam configuration
  fastify.get("/steam/test", async (request, reply) => {
    return reply.send({
      success: true,
      steamConfig: {
        apiKeySet: !!config.steam.apiKey,
        realm: config.steam.realm,
        returnURL: config.steam.returnURL,
      },
      message: "Steam authentication is configured. Try /auth/steam to login.",
    });
  });

  // Steam login - initiate OAuth flow
  fastify.get("/steam", async (request, reply) => {
    try {
      // Manually construct the Steam OpenID URL
      const returnURL = encodeURIComponent(config.steam.returnURL);
      const realm = encodeURIComponent(config.steam.realm);

      const steamOpenIDURL =
        `https://steamcommunity.com/openid/login?` +
        `openid.mode=checkid_setup&` +
        `openid.ns=http://specs.openid.net/auth/2.0&` +
        `openid.identity=http://specs.openid.net/auth/2.0/identifier_select&` +
        `openid.claimed_id=http://specs.openid.net/auth/2.0/identifier_select&` +
        `openid.return_to=${returnURL}&` +
        `openid.realm=${realm}`;

      return reply.redirect(steamOpenIDURL);
    } catch (error) {
      console.error("❌ Steam authentication error:", error);
      return reply.status(500).send({
        error: "AuthenticationError",
        message: "Failed to initiate Steam login",
        details: error.message,
      });
    }
  });

  // Steam OAuth callback - Manual verification
  fastify.get("/steam/return", async (request, reply) => {
    try {
      const query = request.query;

      // Verify this is a valid OpenID response
      if (query["openid.mode"] !== "id_res") {
        return reply.status(400).send({
          error: "AuthenticationError",
          message: "Invalid OpenID response mode",
        });
      }

      // Verify the response with Steam
      const verifyParams = new URLSearchParams();
      for (const key in query) {
        verifyParams.append(key, query[key]);
      }
      verifyParams.set("openid.mode", "check_authentication");

      const verifyResponse = await fetch(
        "https://steamcommunity.com/openid/login",
        {
          method: "POST",
          headers: { "Content-Type": "application/x-www-form-urlencoded" },
          body: verifyParams.toString(),
        }
      );

      const verifyText = await verifyResponse.text();

      if (!verifyText.includes("is_valid:true")) {
        console.error("❌ Steam OpenID verification failed");
        return reply.status(401).send({
          error: "AuthenticationError",
          message: "Steam authentication verification failed",
        });
      }

      // Extract Steam ID from the claimed_id
      const claimedId = query["openid.claimed_id"];
      const steamIdMatch = claimedId.match(/(\d+)$/);

      if (!steamIdMatch) {
        return reply.status(400).send({
          error: "AuthenticationError",
          message: "Could not extract Steam ID",
        });
      }

      const steamId = steamIdMatch[1];

      // Get user profile from Steam API
      const steamApiUrl = `http://api.steampowered.com/ISteamUser/GetPlayerSummaries/v0002/?key=${config.steam.apiKey}&steamids=${steamId}`;
      const profileResponse = await fetch(steamApiUrl);
      const profileData = await profileResponse.json();

      if (
        !profileData.response ||
        !profileData.response.players ||
        profileData.response.players.length === 0
      ) {
        return reply.status(400).send({
          error: "AuthenticationError",
          message: "Could not fetch Steam profile",
        });
      }

      const profile = profileData.response.players[0];

      // Import User model
      const User = (await import("../models/User.js")).default;

      // Find or create user
      let user = await User.findOne({ steamId });

      if (user) {
        // Update existing user
        user.username = profile.personaname;
        user.avatar =
          profile.avatarfull || profile.avatarmedium || profile.avatar;
        user.communityvisibilitystate = profile.communityvisibilitystate;
        await user.save();
        console.log(
          `✅ Existing user logged in: ${user.username} (${steamId})`
        );
      } else {
        // Create new user
        user = new User({
          username: profile.personaname,
          steamId: steamId,
          avatar: profile.avatarfull || profile.avatarmedium || profile.avatar,
          account_creation:
            profile.timecreated || Math.floor(Date.now() / 1000),
          communityvisibilitystate: profile.communityvisibilitystate,
          balance: 0,
          staffLevel: 0,
        });
        await user.save();
        console.log(`✅ New user registered: ${user.username} (${steamId})`);
      }

      // Generate JWT tokens
      const { accessToken, refreshToken } = generateTokenPair(user);

      // Extract device information
      const userAgent = request.headers["user-agent"] || "Unknown";
      const ip =
        request.ip ||
        request.headers["x-forwarded-for"] ||
        request.headers["x-real-ip"] ||
        "Unknown";

      // Simple device detection
      let device = "Desktop";
      let browser = "Unknown";
      let os = "Unknown";

      if (
        userAgent.includes("Mobile") ||
        userAgent.includes("Android") ||
        userAgent.includes("iPhone")
      ) {
        device = "Mobile";
      } else if (userAgent.includes("Tablet") || userAgent.includes("iPad")) {
        device = "Tablet";
      }

      if (userAgent.includes("Chrome")) browser = "Chrome";
      else if (userAgent.includes("Firefox")) browser = "Firefox";
      else if (userAgent.includes("Safari")) browser = "Safari";
      else if (userAgent.includes("Edge")) browser = "Edge";

      if (userAgent.includes("Windows")) os = "Windows";
      else if (userAgent.includes("Mac")) os = "macOS";
      else if (userAgent.includes("Linux")) os = "Linux";
      else if (userAgent.includes("Android")) os = "Android";
      else if (userAgent.includes("iOS") || userAgent.includes("iPhone"))
        os = "iOS";

      // Create session
      try {
        const session = new Session({
          userId: user._id,
          steamId: user.steamId,
          token: accessToken,
          refreshToken: refreshToken,
          ip: ip,
          userAgent: userAgent,
          device: device,
          browser: browser,
          os: os,
          location: {
            country: null, // Can integrate with IP geolocation service
            city: null,
            region: null,
          },
          isActive: true,
          lastActivity: new Date(),
          expiresAt: new Date(Date.now() + 7 * 24 * 60 * 60 * 1000), // 7 days
        });

        await session.save();
        console.log(
          `📱 Session created for ${user.username} from ${ip} (${device}/${browser})`
        );
      } catch (error) {
        console.error("Failed to create session:", error);
        // Don't fail login if session creation fails
      }

      // Set cookies
      reply
        .setCookie("accessToken", accessToken, {
          httpOnly: true,
          secure: config.cookie.secure,
          sameSite: config.cookie.sameSite,
          path: "/",
          maxAge: 15 * 60,
          domain: config.cookie.domain,
        })
        .setCookie("refreshToken", refreshToken, {
          httpOnly: true,
          secure: config.cookie.secure,
          sameSite: config.cookie.sameSite,
          path: "/",
          maxAge: 7 * 24 * 60 * 60,
          domain: config.cookie.domain,
        });

      console.log(`✅ User ${user.username} logged in successfully`);

      // Redirect to frontend
      return reply.redirect(`${config.cors.origin}/`);
    } catch (error) {
      console.error("❌ Steam callback error:", error);
      return reply.status(500).send({
        error: "AuthenticationError",
        message: "Steam authentication failed",
        details: error.message,
      });
    }
  });

  // Get current user
  fastify.get(
    "/me",
    {
      preHandler: authenticate,
    },
    async (request, reply) => {
      // Remove sensitive data
      const user = request.user.toObject();
      delete user.twoFactor.secret;
      delete user.email.emailToken;

      return reply.send({
        success: true,
        user: user,
      });
    }
  );

  // Decode JWT token (for debugging - shows what's in the token)
  fastify.get("/decode-token", async (request, reply) => {
    try {
      let token = null;

      // Try to get token from Authorization header
      const authHeader = request.headers.authorization;
      if (authHeader && authHeader.startsWith("Bearer ")) {
        token = authHeader.substring(7);
      }

      // If not in header, try cookies
      if (!token && request.cookies && request.cookies.accessToken) {
        token = request.cookies.accessToken;
      }

      if (!token) {
        return reply.status(400).send({
          error: "NoToken",
          message: "No token provided. Send in Authorization header or cookie.",
        });
      }

      // Import JWT utilities
      const { decodeToken } = await import("../utils/jwt.js");
      const decoded = decodeToken(token);

      if (!decoded) {
        return reply.status(400).send({
          error: "InvalidToken",
          message: "Could not decode token",
        });
      }

      return reply.send({
        success: true,
        decoded: decoded,
        message: "This shows what data is stored in your JWT token",
      });
    } catch (error) {
      return reply.status(500).send({
        error: "DecodeError",
        message: error.message,
      });
    }
  });

  // Refresh access token using refresh token
  fastify.post(
    "/refresh",
    {
      preHandler: verifyRefreshTokenMiddleware,
    },
    async (request, reply) => {
      try {
        const user = request.user;

        // Generate new token pair
        const { accessToken, refreshToken } = generateTokenPair(user);

        // Update existing session with new tokens
        try {
          const oldSession = await Session.findOne({
            refreshToken: request.refreshToken,
            userId: user._id,
          });

          if (oldSession) {
            oldSession.token = accessToken;
            oldSession.refreshToken = refreshToken;
            oldSession.lastActivity = new Date();
            await oldSession.save();
          }
        } catch (error) {
          console.error("Failed to update session:", error);
        }

        // Set new cookies
        reply
          .setCookie("accessToken", accessToken, {
            httpOnly: true,
            secure: config.cookie.secure,
            sameSite: config.cookie.sameSite,
            path: "/",
            maxAge: 15 * 60, // 15 minutes
            domain: config.cookie.domain,
          })
          .setCookie("refreshToken", refreshToken, {
            httpOnly: true,
            secure: config.cookie.secure,
            sameSite: config.cookie.sameSite,
            path: "/",
            maxAge: 7 * 24 * 60 * 60, // 7 days
            domain: config.cookie.domain,
          });

        return reply.send({
          success: true,
          message: "Tokens refreshed successfully",
          accessToken,
          refreshToken,
        });
      } catch (error) {
        console.error("Token refresh error:", error);
        return reply.status(500).send({
          error: "InternalServerError",
          message: "Failed to refresh tokens",
        });
      }
    }
  );

  // Logout - clear cookies and invalidate session
  fastify.post(
    "/logout",
    {
      preHandler: authenticate,
    },
    async (request, reply) => {
      try {
        // Deactivate current session
        try {
          const session = await Session.findOne({
            token: request.token,
            userId: request.user._id,
          });

          if (session) {
            await session.deactivate();
          }
        } catch (error) {
          console.error("Failed to deactivate session:", error);
        }

        // Clear cookies
        reply
          .clearCookie("accessToken", {
            path: "/",
            domain: config.cookie.domain,
          })
          .clearCookie("refreshToken", {
            path: "/",
            domain: config.cookie.domain,
          });

        console.log(`👋 User ${request.user.username} logged out`);

        return reply.send({
          success: true,
          message: "Logged out successfully",
        });
      } catch (error) {
        console.error("Logout error:", error);
        return reply.status(500).send({
          error: "InternalServerError",
          message: "Failed to logout",
        });
      }
    }
  );

  // Verify access token endpoint (useful for checking if token is still valid)
  fastify.get(
    "/verify",
    {
      preHandler: authenticate,
    },
    async (request, reply) => {
      return reply.send({
        success: true,
        valid: true,
        userId: request.user._id,
        steamId: request.user.steamId,
      });
    }
  );
}