import { NextRequest, NextResponse } from "next/server";
import {
  checkRateLimit,
  getClientIP,
  createRateLimitResponse,
} from "@/lib/rate-limiter";
import { secureLogger } from "@/lib/secure-logger";
import { loginSchema } from "@/lib/validation-schemas";
import { comparePassword } from "@/lib/auth/password";
import {
  generateAccessToken,
  generateRefreshToken,
} from "@/lib/auth/jwt";
import {
  getUserByEmail,
  getUserByUsername,
  updateLastLogin,
} from "@/lib/db/queries/users";
import { setSession } from "@/lib/redis/session";
import { randomUUID } from "crypto";

export async function POST(request: NextRequest) {
  try {
    // Rate limiting
    const ip = getClientIP(request);
    const rateLimit = checkRateLimit(ip, "/api/auth/login");

    if (!rateLimit.allowed) {
      return createRateLimitResponse(rateLimit.resetAt);
    }

    const body = await request.json();

    secureLogger.info("📥 POST /api/auth/login - Recebido", {
      ip,
      timestamp: new Date().toISOString(),
    });

    // Validação com Zod
    const validationResult = loginSchema.safeParse(body);

    if (!validationResult.success) {
      const errors = validationResult.error.issues.map((err) => ({
        field: err.path.join("."),
        message: err.message,
      }));

      return NextResponse.json(
        {
          success: false,
          error: "Dados de entrada inválidos",
          details: errors,
        },
        { status: 400 }
      );
    }

    const { emailOrUsername, password } = validationResult.data;

    // Buscar usuário por email ou username
    const user =
      (await getUserByEmail(emailOrUsername)) ||
      (await getUserByUsername(emailOrUsername));

    if (!user) {
      secureLogger.warn("⚠️ Tentativa de login com credenciais inválidas", {
        emailOrUsername: secureLogger.mask({ emailOrUsername }),
        timestamp: new Date().toISOString(),
      });

      return NextResponse.json(
        {
          success: false,
          error: "Email/username ou senha incorretos",
        },
        { status: 401 }
      );
    }

    // Verificar se usuário está ativo
    if (!user.is_active) {
      return NextResponse.json(
        {
          success: false,
          error: "Conta desativada. Entre em contato com o suporte.",
        },
        { status: 403 }
      );
    }

    // Verificar senha
    if (!user.password_hash) {
      secureLogger.error("❌ Usuário sem password_hash", {
        userId: user.user_id,
        timestamp: new Date().toISOString(),
      });

      return NextResponse.json(
        {
          success: false,
          error: "Erro interno. Tente novamente mais tarde.",
        },
        { status: 500 }
      );
    }

    const passwordMatch = await comparePassword(password, user.password_hash);

    if (!passwordMatch) {
      secureLogger.warn("⚠️ Senha incorreta", {
        userId: user.user_id,
        timestamp: new Date().toISOString(),
      });

      return NextResponse.json(
        {
          success: false,
          error: "Email/username ou senha incorretos",
        },
        { status: 401 }
      );
    }

    // Atualizar último login
    await updateLastLogin(user.user_id);

    // Gerar tokens
    const accessToken = generateAccessToken(user.user_id, user.username);
    const refreshToken = generateRefreshToken(user.user_id, user.username);

    // Criar sessão no Redis
    const sessionId = randomUUID();
    await setSession(sessionId, {
      userId: user.user_id,
      username: user.username,
      email: user.email,
      accessToken,
      createdAt: Date.now(),
    });

    // Criar resposta
    const response = NextResponse.json(
      {
        success: true,
        user: {
          userId: user.user_id,
          username: user.username,
          email: user.email,
          firstName: user.first_name,
          lastName: user.last_name,
          accountLevel: user.account_level,
          hasDonated: user.has_donated,
        },
        accessToken,
      },
      { status: 200 }
    );

    // Adicionar refresh token e sessionId como cookies httpOnly
    response.cookies.set("refreshToken", refreshToken, {
      httpOnly: true,
      secure: process.env.NODE_ENV === "production",
      sameSite: "lax",
      maxAge: 60 * 60 * 24 * 7, // 7 dias
      path: "/",
    });

    response.cookies.set("sessionId", sessionId, {
      httpOnly: true,
      secure: process.env.NODE_ENV === "production",
      sameSite: "lax",
      maxAge: 60 * 60 * 24 * 7, // 7 dias
      path: "/",
    });

    secureLogger.info("✅ Login realizado com sucesso", {
      userId: user.user_id,
      username: user.username,
      timestamp: new Date().toISOString(),
    });

    return response;
  } catch (error) {
    secureLogger.error("❌ Erro ao fazer login", {
      error: error instanceof Error ? error.message : "Erro desconhecido",
      stack: error instanceof Error ? error.stack : undefined,
      timestamp: new Date().toISOString(),
    });

    return NextResponse.json(
      {
        success: false,
        error: error instanceof Error ? error.message : "Erro interno",
      },
      { status: 500 }
    );
  }
}