import {
  Controller,
  Post,
  Body,
  UseGuards,
  Get,
  Req,
  HttpCode,
  UsePipes,
  Res,
} from "@nestjs/common";
import type { Request, Response } from "express";
import { Throttle } from "@nestjs/throttler";
import { AuthService } from "./auth.service";
import { LocalAuthGuard } from "./guards/local-auth.guard";
import { AuthThrottleGuard } from "./guards/auth-throttle.guard";
import { ApiTags, ApiOperation, ApiResponse, ApiOkResponse } from "@nestjs/swagger";
import { Public } from "./decorators/public.decorator";
import { ZodValidationPipe } from "@bff/core/validation";

// Import Zod schemas from domain
import {
  signupRequestSchema,
  passwordResetRequestSchema,
  passwordResetSchema,
  setPasswordRequestSchema,
  linkWhmcsRequestSchema,
  changePasswordRequestSchema,
  validateSignupRequestSchema,
  accountStatusRequestSchema,
  ssoLinkRequestSchema,
  checkPasswordNeededRequestSchema,
  type SignupRequestInput,
  type PasswordResetRequestInput,
  type PasswordResetInput,
  type SetPasswordRequestInput,
  type LinkWhmcsRequestInput,
  type ChangePasswordRequestInput,
  type ValidateSignupRequestInput,
  type AccountStatusRequestInput,
  type SsoLinkRequestInput,
  type CheckPasswordNeededRequestInput,
  refreshTokenRequestSchema,
  type RefreshTokenRequestInput,
} from "@customer-portal/domain";
import type { AuthTokens } from "@customer-portal/domain";

type RequestWithCookies = Request & { cookies?: Record<string, string | undefined> };

const EXTRACT_BEARER = (req: RequestWithCookies): string | undefined => {
  const authHeader = req.headers?.authorization;
  if (typeof authHeader === "string" && authHeader.startsWith("Bearer ")) {
    return authHeader.slice(7);
  }
  if (Array.isArray(authHeader) && authHeader.length > 0 && authHeader[0]?.startsWith("Bearer ")) {
    return authHeader[0]?.slice(7);
  }
  return undefined;
};

const extractTokenFromRequest = (req: RequestWithCookies): string | undefined => {
  const headerToken = EXTRACT_BEARER(req);
  if (headerToken) {
    return headerToken;
  }
  const cookieToken = req.cookies?.access_token;
  return typeof cookieToken === "string" && cookieToken.length > 0 ? cookieToken : undefined;
};

const calculateCookieMaxAge = (isoTimestamp: string): number => {
  const expiresAt = Date.parse(isoTimestamp);
  if (Number.isNaN(expiresAt)) {
    return 0;
  }
  return Math.max(0, expiresAt - Date.now());
};

@ApiTags("auth")
@Controller("auth")
export class AuthController {
  constructor(private authService: AuthService) {}

  private setAuthCookies(res: Response, tokens: AuthTokens): void {
    const accessMaxAge = calculateCookieMaxAge(tokens.expiresAt);
    const refreshMaxAge = calculateCookieMaxAge(tokens.refreshExpiresAt);

    res.setSecureCookie("access_token", tokens.accessToken, {
      maxAge: accessMaxAge,
      path: "/",
    });
    res.setSecureCookie("refresh_token", tokens.refreshToken, {
      maxAge: refreshMaxAge,
      path: "/",
    });
  }

  private clearAuthCookies(res: Response): void {
    res.setSecureCookie("access_token", "", { maxAge: 0, path: "/" });
    res.setSecureCookie("refresh_token", "", { maxAge: 0, path: "/" });
  }

  @Public()
  @Post("validate-signup")
  @UseGuards(AuthThrottleGuard)
  @Throttle({ default: { limit: 10, ttl: 900000 } }) // 10 validations per 15 minutes per IP
  @UsePipes(new ZodValidationPipe(validateSignupRequestSchema))
  @ApiOperation({ summary: "Validate customer number for signup" })
  @ApiResponse({ status: 200, description: "Validation successful" })
  @ApiResponse({ status: 409, description: "Customer already has account" })
  @ApiResponse({ status: 400, description: "Customer number not found" })
  @ApiResponse({ status: 429, description: "Too many validation attempts" })
  async validateSignup(@Body() validateData: ValidateSignupRequestInput, @Req() req: Request) {
    return this.authService.validateSignup(validateData, req);
  }

  @Public()
  @Get("health-check")
  @ApiOperation({ summary: "Check auth service health and integrations" })
  @ApiResponse({ status: 200, description: "Health check results" })
  async healthCheck() {
    return this.authService.healthCheck();
  }

  @Public()
  @Post("signup-preflight")
  @UseGuards(AuthThrottleGuard)
  @Throttle({ default: { limit: 10, ttl: 900000 } })
  @UsePipes(new ZodValidationPipe(signupRequestSchema))
  @HttpCode(200)
  @ApiOperation({ summary: "Validate full signup data without creating anything" })
  @ApiResponse({ status: 200, description: "Preflight results with next action guidance" })
  async signupPreflight(@Body() signupData: SignupRequestInput) {
    return this.authService.signupPreflight(signupData);
  }

  @Public()
  @Post("account-status")
  @UsePipes(new ZodValidationPipe(accountStatusRequestSchema))
  @ApiOperation({ summary: "Get account status by email" })
  @ApiOkResponse({ description: "Account status" })
  async accountStatus(@Body() body: AccountStatusRequestInput) {
    return this.authService.getAccountStatus(body.email);
  }

  @Public()
  @Post("signup")
  @UseGuards(AuthThrottleGuard)
  @Throttle({ default: { limit: 3, ttl: 900000 } }) // 3 signups per 15 minutes per IP
  @UsePipes(new ZodValidationPipe(signupRequestSchema))
  @ApiOperation({ summary: "Create new user account" })
  @ApiResponse({ status: 201, description: "User created successfully" })
  @ApiResponse({ status: 409, description: "User already exists" })
  @ApiResponse({ status: 429, description: "Too many signup attempts" })
  async signup(
    @Body() signupData: SignupRequestInput,
    @Req() req: Request,
    @Res({ passthrough: true }) res: Response
  ) {
    const result = await this.authService.signup(signupData, req);
    this.setAuthCookies(res, result.tokens);
    return result;
  }

  @Public()
  @UseGuards(LocalAuthGuard, AuthThrottleGuard)
  @Throttle({ default: { limit: 5, ttl: 900000 } }) // 5 login attempts per 15 minutes per IP+UA
  @Post("login")
  @ApiOperation({ summary: "Authenticate user" })
  @ApiResponse({ status: 200, description: "Login successful" })
  @ApiResponse({ status: 401, description: "Invalid credentials" })
  @ApiResponse({ status: 429, description: "Too many login attempts" })
  async login(
    @Req() req: Request & { user: { id: string; email: string; role: string } },
    @Res({ passthrough: true }) res: Response
  ) {
    const result = await this.authService.login(req.user, req);
    this.setAuthCookies(res, result.tokens);
    return result;
  }

  @Post("logout")
  @ApiOperation({ summary: "Logout user" })
  @ApiResponse({ status: 200, description: "Logout successful" })
  async logout(
    @Req() req: RequestWithCookies & { user: { id: string } },
    @Res({ passthrough: true }) res: Response
  ) {
    const token = extractTokenFromRequest(req);
    await this.authService.logout(req.user.id, token, req);
    this.clearAuthCookies(res);
    return { message: "Logout successful" };
  }

  @Public()
  @Post("refresh")
  @Throttle({ default: { limit: 10, ttl: 300000 } }) // 10 attempts per 5 minutes per IP
  @UsePipes(new ZodValidationPipe(refreshTokenRequestSchema))
  @ApiOperation({ summary: "Refresh access token using refresh token" })
  @ApiResponse({ status: 200, description: "Token refreshed successfully" })
  @ApiResponse({ status: 401, description: "Invalid refresh token" })
  @ApiResponse({ status: 429, description: "Too many refresh attempts" })
  async refreshToken(
    @Body() body: RefreshTokenRequestInput,
    @Req() req: RequestWithCookies,
    @Res({ passthrough: true }) res: Response
  ) {
    const refreshToken = body.refreshToken ?? req.cookies?.refresh_token;
    const result = await this.authService.refreshTokens(refreshToken, {
      deviceId: body.deviceId,
      userAgent: req.headers["user-agent"],
    });
    this.setAuthCookies(res, result.tokens);
    return result;
  }

  @Public()
  @Post("link-whmcs")
  @UseGuards(AuthThrottleGuard)
  @Throttle({ default: { limit: 3, ttl: 900000 } }) // 3 attempts per 15 minutes per IP
  @UsePipes(new ZodValidationPipe(linkWhmcsRequestSchema))
  @ApiOperation({ summary: "Link existing WHMCS user" })
  @ApiResponse({
    status: 200,
    description: "WHMCS account linked successfully",
  })
  @ApiResponse({ status: 401, description: "Invalid WHMCS credentials" })
  @ApiResponse({ status: 429, description: "Too many link attempts" })
  async linkWhmcs(@Body() linkData: LinkWhmcsRequestInput, @Req() _req: Request) {
    return this.authService.linkWhmcsUser(linkData);
  }

  @Public()
  @Post("set-password")
  @UseGuards(AuthThrottleGuard)
  @Throttle({ default: { limit: 3, ttl: 300000 } }) // 3 attempts per 5 minutes per IP+UA
  @UsePipes(new ZodValidationPipe(setPasswordRequestSchema))
  @ApiOperation({ summary: "Set password for linked user" })
  @ApiResponse({ status: 200, description: "Password set successfully" })
  @ApiResponse({ status: 401, description: "User not found" })
  @ApiResponse({ status: 429, description: "Too many password attempts" })
  async setPassword(
    @Body() setPasswordData: SetPasswordRequestInput,
    @Req() _req: Request,
    @Res({ passthrough: true }) res: Response
  ) {
    const result = await this.authService.setPassword(setPasswordData);
    this.setAuthCookies(res, result.tokens);
    return result;
  }

  @Public()
  @Post("check-password-needed")
  @UsePipes(new ZodValidationPipe(checkPasswordNeededRequestSchema))
  @HttpCode(200)
  @ApiOperation({ summary: "Check if user needs to set password" })
  @ApiResponse({ status: 200, description: "Password status checked" })
  async checkPasswordNeeded(@Body() data: CheckPasswordNeededRequestInput) {
    return this.authService.checkPasswordNeeded(data.email);
  }

  @Public()
  @Post("request-password-reset")
  @Throttle({ default: { limit: 5, ttl: 900000 } })
  @UsePipes(new ZodValidationPipe(passwordResetRequestSchema))
  @ApiOperation({ summary: "Request password reset email" })
  @ApiResponse({ status: 200, description: "Reset email sent if account exists" })
  async requestPasswordReset(@Body() body: PasswordResetRequestInput) {
    await this.authService.requestPasswordReset(body.email);
    return { message: "If an account exists, a reset email has been sent" };
  }

  @Public()
  @Post("reset-password")
  @Throttle({ default: { limit: 5, ttl: 900000 } })
  @UsePipes(new ZodValidationPipe(passwordResetSchema))
  @ApiOperation({ summary: "Reset password with token" })
  @ApiResponse({ status: 200, description: "Password reset successful" })
  async resetPassword(@Body() body: PasswordResetInput, @Res({ passthrough: true }) res: Response) {
    const result = await this.authService.resetPassword(body.token, body.password);
    this.setAuthCookies(res, result.tokens);
    return result;
  }

  @Post("change-password")
  @Throttle({ default: { limit: 5, ttl: 300000 } })
  @UsePipes(new ZodValidationPipe(changePasswordRequestSchema))
  @ApiOperation({ summary: "Change password (authenticated)" })
  @ApiResponse({ status: 200, description: "Password changed successfully" })
  async changePassword(
    @Req() req: Request & { user: { id: string } },
    @Body() body: ChangePasswordRequestInput,
    @Res({ passthrough: true }) res: Response
  ) {
    const result = await this.authService.changePassword(
      req.user.id,
      body.currentPassword,
      body.newPassword,
      req
    );
    this.setAuthCookies(res, result.tokens);
    return result;
  }

  @Get("me")
  @ApiOperation({ summary: "Get current authentication status" })
  getAuthStatus(@Req() req: Request & { user: { id: string; email: string; role: string } }) {
    // Return basic auth info only - full profile should use /api/me
    return {
      isAuthenticated: true,
      user: {
        id: req.user.id,
        email: req.user.email,
        role: req.user.role,
      },
    };
  }

  @Post("sso-link")
  @UsePipes(new ZodValidationPipe(ssoLinkRequestSchema))
  @ApiOperation({ summary: "Create SSO link to WHMCS" })
  @ApiResponse({ status: 200, description: "SSO link created successfully" })
  @ApiResponse({
    status: 404,
    description: "User not found or not linked to WHMCS",
  })
  async createSsoLink(
    @Req() req: Request & { user: { id: string } },
    @Body() body: SsoLinkRequestInput
  ) {
    const destination = body?.destination;
    return this.authService.createSsoLink(req.user.id, destination);
  }
}