import { Body, Controller, Get, HttpCode, Post, Req, Res } from '@nestjs/common';
import {
  CurrentUser as CurrentUserShape,
  LoginInput,
  SignupInput,
  forgotPasswordInputSchema,
  loginInputSchema,
  resendVerificationInputSchema,
  resetPasswordInputSchema,
  signupInputSchema,
  verifyEmailInputSchema,
} from '@dorfteich/shared';
import type { Response } from 'express';

import { ZodValidationPipe } from '../common/zod-validation.pipe';
import { AppConfig } from '../config/app-config.service';
import { AuthenticatedOnly } from '../permissions/permission.decorators';
import { RateLimit } from '../rate-limit/rate-limit.guard';
import { InstanceSettingsService } from '../settings/instance-settings.service';
import { SetupExempt } from '../setup/setup.guard';
import {
  AuthedRequest,
  Public,
  SESSION_COOKIE,
  setSessionCookie,
  toCurrentUser,
} from './auth.guard';
import { AuthService } from './auth.service';
import { SessionsService } from './sessions.service';

@AuthenticatedOnly() // routes reachable without a session opt out via @Public
@Controller('auth')
export class AuthController {
  constructor(
    private readonly auth: AuthService,
    private readonly sessions: SessionsService,
    private readonly config: AppConfig,
    private readonly settings: InstanceSettingsService,
  ) {}

  /** Public: the SPA hides the signup route while registration is closed. */
  @Public()
  @Get('registration')
  async registration(): Promise<{ mode: 'open' | 'closed' }> {
    return { mode: await this.settings.get('auth.registrationMode') };
  }

  @Public()
  @Post('signup')
  @HttpCode(201)
  @RateLimit({ scope: 'signup', limit: 5, windowSeconds: 60 * 60 })
  async signup(@Body(new ZodValidationPipe(signupInputSchema)) input: SignupInput): Promise<void> {
    await this.auth.signup(input);
  }

  @Public()
  @Post('verify-email')
  @HttpCode(204)
  @RateLimit({ scope: 'verify-email', limit: 20, windowSeconds: 60 * 60 })
  async verifyEmail(
    @Body(new ZodValidationPipe(verifyEmailInputSchema)) input: { token: string },
  ): Promise<void> {
    await this.auth.verifyEmail(input.token);
  }

  @Public()
  @Post('resend-verification')
  @HttpCode(204)
  @RateLimit({ scope: 'resend-verification', limit: 5, windowSeconds: 60 * 60 })
  async resendVerification(
    @Body(new ZodValidationPipe(resendVerificationInputSchema)) input: { email: string },
  ): Promise<void> {
    await this.auth.resendVerification(input.email);
  }

  // Exempt from the setup gate: a mid-wizard Site Admin who lost the
  // session cookie must be able to sign back in and finish setup.
  @SetupExempt()
  @Public()
  @Post('login')
  @HttpCode(200)
  @RateLimit({ scope: 'login', limit: 10, windowSeconds: 60 })
  async login(
    @Body(new ZodValidationPipe(loginInputSchema)) input: LoginInput,
    @Req() request: AuthedRequest,
    @Res({ passthrough: true }) response: Response,
  ): Promise<CurrentUserShape> {
    const { sessionToken, user } = await this.auth.login(
      input.usernameOrEmail,
      input.password,
      request.headers['user-agent'],
    );
    setSessionCookie(response, sessionToken, this.config.env.NODE_ENV === 'production');
    return toCurrentUser(user);
  }

  @SetupExempt()
  @Post('logout')
  @HttpCode(204)
  async logout(
    @Req() request: AuthedRequest,
    @Res({ passthrough: true }) response: Response,
  ): Promise<void> {
    if (request.sessionToken) {
      await this.sessions.destroyByRawToken(request.sessionToken);
    }
    response.clearCookie(SESSION_COOKIE, { path: '/' });
  }

  @SetupExempt()
  @Get('me')
  me(@Req() request: AuthedRequest): CurrentUserShape {
    // AuthGuard guarantees request.user for non-@Public routes.
    return toCurrentUser(request.user!);
  }

  @Public()
  @Post('forgot-password')
  @HttpCode(204)
  @RateLimit({ scope: 'forgot-password', limit: 5, windowSeconds: 60 * 60 })
  async forgotPassword(
    @Body(new ZodValidationPipe(forgotPasswordInputSchema)) input: { email: string },
  ): Promise<void> {
    await this.auth.forgotPassword(input.email);
  }

  @Public()
  @Post('reset-password')
  @HttpCode(204)
  @RateLimit({ scope: 'reset-password', limit: 10, windowSeconds: 60 * 60 })
  async resetPassword(
    @Body(new ZodValidationPipe(resetPasswordInputSchema))
    input: {
      token: string;
      password: string;
    },
  ): Promise<void> {
    await this.auth.resetPassword(input.token, input.password);
  }
}