import { Controller, Post, Body, UseGuards, Get, Req, HttpCode } from "@nestjs/common";
import type { Request } 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 { ZodPipe } from "@bff/core/validation";

// Import Zod schemas from domain
import {
  bffSignupSchema,
  bffLoginSchema,
  bffPasswordResetRequestSchema,
  bffPasswordResetSchema,
  bffSetPasswordSchema,
  bffLinkWhmcsSchema,
  bffChangePasswordSchema,
  bffValidateSignupSchema,
  bffAccountStatusRequestSchema,
  bffSsoLinkSchema,
  bffCheckPasswordNeededSchema,
  type BffSignupData,
  type BffLoginData,
  type BffPasswordResetRequestData,
  type BffPasswordResetData,
  type BffSetPasswordData,
  type BffLinkWhmcsData,
  type BffChangePasswordData,
  type BffValidateSignupData,
  type BffAccountStatusRequestData,
  type BffSsoLinkData,
  type BffCheckPasswordNeededData,
} from "@customer-portal/domain";

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

  @Public()
  @Post("validate-signup")
  @UseGuards(AuthThrottleGuard)
  @Throttle({ default: { limit: 10, ttl: 900000 } }) // 10 validations per 15 minutes per IP
  @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(ZodPipe(bffValidateSignupSchema)) validateData: BffValidateSignupData,
    @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 } })
  @HttpCode(200)
  @ApiOperation({ summary: "Validate full signup data without creating anything" })
  @ApiResponse({ status: 200, description: "Preflight results with next action guidance" })
  async signupPreflight(@Body(ZodPipe(bffSignupSchema)) signupData: BffSignupData) {
    return this.authService.signupPreflight(signupData);
  }

  @Public()
  @Post("account-status")
  @ApiOperation({ summary: "Get account status by email" })
  @ApiOkResponse({ description: "Account status" })
  async accountStatus(@Body(ZodPipe(bffAccountStatusRequestSchema)) body: BffAccountStatusRequestData) {
    return this.authService.getAccountStatus(body.email);
  }

  @Public()
  @Post("signup")
  @UseGuards(AuthThrottleGuard)
  @Throttle({ default: { limit: 3, ttl: 900000 } }) // 3 signups per 15 minutes per IP
  @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(ZodPipe(bffSignupSchema)) signupData: BffSignupData, @Req() req: Request) {
    return this.authService.signup(signupData, req);
  }

  @Public()
  @UseGuards(LocalAuthGuard)
  @Post("login")
  @ApiOperation({ summary: "Authenticate user" })
  @ApiResponse({ status: 200, description: "Login successful" })
  @ApiResponse({ status: 401, description: "Invalid credentials" })
  async login(@Req() req: Request & { user: { id: string; email: string; role?: string } }) {
    return this.authService.login(req.user, req);
  }

  @Post("logout")
  @ApiOperation({ summary: "Logout user" })
  @ApiResponse({ status: 200, description: "Logout successful" })
  async logout(@Req() req: Request & { user: { id: string } }) {
    const authHeader = req.headers.authorization as string | string[] | undefined;
    let bearer: string | undefined;
    if (typeof authHeader === "string") {
      bearer = authHeader;
    } else if (Array.isArray(authHeader) && authHeader.length > 0) {
      bearer = authHeader[0];
    }
    const token = bearer?.startsWith("Bearer ") ? bearer.slice(7) : undefined;
    await this.authService.logout(req.user.id, token ?? "", req);
    return { message: "Logout successful" };
  }

  @Public()
  @Post("link-whmcs")
  @UseGuards(AuthThrottleGuard)
  @Throttle({ default: { limit: 3, ttl: 900000 } }) // 3 attempts per 15 minutes per IP
  @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(ZodPipe(bffLinkWhmcsSchema)) linkData: BffLinkWhmcsData, @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
  @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(ZodPipe(bffSetPasswordSchema)) setPasswordData: BffSetPasswordData, @Req() _req: Request) {
    return this.authService.setPassword(setPasswordData);
  }

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

  @Public()
  @Post("request-password-reset")
  @Throttle({ default: { limit: 5, ttl: 900000 } })
  @ApiOperation({ summary: "Request password reset email" })
  @ApiResponse({ status: 200, description: "Reset email sent if account exists" })
  async requestPasswordReset(@Body(ZodPipe(bffPasswordResetRequestSchema)) body: BffPasswordResetRequestData) {
    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 } })
  @ApiOperation({ summary: "Reset password with token" })
  @ApiResponse({ status: 200, description: "Password reset successful" })
  async resetPassword(@Body(ZodPipe(bffPasswordResetSchema)) body: BffPasswordResetData) {
    return this.authService.resetPassword(body.token, body.password);
  }

  @Post("change-password")
  @Throttle({ default: { limit: 5, ttl: 300000 } })
  @ApiOperation({ summary: "Change password (authenticated)" })
  @ApiResponse({ status: 200, description: "Password changed successfully" })
  async changePassword(
    @Req() req: Request & { user: { id: string } },
    @Body(ZodPipe(bffChangePasswordSchema)) body: BffChangePasswordData
  ) {
    return this.authService.changePassword(
      req.user.id,
      body.currentPassword,
      body.newPassword,
      req
    );
  }

  @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")
  @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(ZodPipe(bffSsoLinkSchema)) body: BffSsoLinkData
  ) {
    const destination = body?.destination;
    return this.authService.createSsoLink(req.user.id, destination);
  }
}