import {
  Body,
  Controller,
  Get,
  Post,
  Req,
  Res,
  HttpCode,
  HttpStatus,
} from '@nestjs/common';
import { ApiTags, ApiOperation, ApiResponse, ApiBody } from '@nestjs/swagger';
import { Request, Response } from 'express';
import { ConfigService } from '@nestjs/config';
import { ZodValidationPipe } from '../../common/pipes/zod-validation.pipe';
import { Public } from '../../common/decorators/public.decorator';
import {
  ChangePasswordDtoSchema,
  LoginDtoSchema,
  RefreshDtoSchema,
  RegisterDtoSchema,
} from './dto/auth.dto';
import { AuthService } from './auth.service';
import { CsrfMiddleware } from '../../common/middleware/csrf.middleware';
import { setRefreshCookie, clearRefreshCookie } from './cookie';

@ApiTags('auth')
@Controller('api/v1/auth')
export class AuthController {
  constructor(
    private readonly auth: AuthService,
    private readonly csrf: CsrfMiddleware,
    private readonly config: ConfigService,
  ) {}

  @Public()
  @Post('register')
  @ApiOperation({ summary: 'Public player self-registration' })
  @ApiResponse({ status: 201, description: 'Registration successful, returns login session' })
  async register(
    @Body(new ZodValidationPipe(RegisterDtoSchema)) body: {
      username: string;
      password: string;
      passwordConfirm: string;
    },
    @Req() req: Request,
    @Res({ passthrough: true }) res: Response,
  ) {
    const ip = (req.ip || req.socket.remoteAddress || 'unknown') as string;
    const session = await this.auth.registerPlayer(body, ip);
    setRefreshCookie(res, session.refreshToken, this.config);
    return {
      accessToken: session.accessToken,
      expiresIn: session.expiresIn,
      user: session.user,
    };
  }

  @Public()
  @Post('login')
  @ApiOperation({ summary: 'Login with username and password' })
  @ApiBody({ schema: { example: { username: 'admin', password: 'SuperSecret123!' } } })
  @ApiResponse({ status: 200, description: 'Login successful' })
  async login(
    @Body(new ZodValidationPipe(LoginDtoSchema)) body: { username: string; password: string },
    @Req() req: Request,
    @Res({ passthrough: true }) res: Response,
  ) {
    const ip = (req.ip || req.socket.remoteAddress || 'unknown') as string;
    const session = await this.auth.login(body, ip);
    setRefreshCookie(res, session.refreshToken, this.config);
    return {
      accessToken: session.accessToken,
      expiresIn: session.expiresIn,
      user: session.user,
    };
  }

  @Public()
  @Post('refresh')
  @HttpCode(HttpStatus.OK)
  @ApiOperation({ summary: 'Rotate the refresh token' })
  async refresh(
    @Req() req: Request,
    @Res({ passthrough: true }) res: Response,
    @Body(new ZodValidationPipe(RefreshDtoSchema)) body: { refreshToken?: string },
  ) {
    const fromCookie = (req.cookies?.['rt'] as string | undefined) ?? '';
    const token = body.refreshToken ?? fromCookie;
    if (!token) return { message: 'No refresh token' };
    const session = await this.auth.refresh(token);
    setRefreshCookie(res, session.refreshToken, this.config);
    return {
      accessToken: session.accessToken,
      expiresIn: session.expiresIn,
      user: session.user,
    };
  }

  @Public()
  @Post('logout')
  @HttpCode(HttpStatus.NO_CONTENT)
  @ApiOperation({ summary: 'Invalidate the current refresh token' })
  async logout(@Req() req: Request, @Res({ passthrough: true }) res: Response): Promise<void> {
    const token = (req.cookies?.['rt'] as string | undefined) ?? '';
    await this.auth.logout(token || undefined);
    clearRefreshCookie(res);
  }

  @Get('me')
  @ApiOperation({ summary: 'Current authenticated user profile (id, username, role, rank, points)' })
  @ApiResponse({ status: 200, description: 'Returns the current user projection.' })
  async me(@Req() req: Request): Promise<{
    id: string;
    username: string;
    role: 'admin' | 'player';
    rank: number | null;
    points: number;
  }> {
    const user = req.user as { sub: string } | undefined;
    const userId = user?.sub;
    if (!userId) {
      throw new (await import('@nestjs/common')).UnauthorizedException('Not authenticated');
    }
    return this.auth.getMe(userId);
  }

  @Post('change-password')
  @HttpCode(HttpStatus.NO_CONTENT)
  @ApiOperation({ summary: 'Change the current user password (requires old password)' })
  @ApiBody({
    schema: {
      example: { oldPassword: 'Sup3rSecret!Pass', newPassword: 'NewSecret!Pass1', confirmNewPassword: 'NewSecret!Pass1' },
    },
  })
  async changePassword(
    @Req() req: Request,
    @Body(new ZodValidationPipe(ChangePasswordDtoSchema))
    body: { oldPassword: string; newPassword: string; confirmNewPassword: string },
  ): Promise<void> {
    const user = req.user as { sub: string } | undefined;
    const userId = user?.sub;
    if (!userId) {
      throw new (await import('@nestjs/common')).UnauthorizedException('Not authenticated');
    }
    await this.auth.changePassword(userId, body);
  }

  @Public()
  @Get('csrf')
  @ApiOperation({ summary: 'Issue a CSRF token (sets csrf cookie, returns token)' })
  @ApiResponse({ status: 200, schema: { example: { csrfToken: '...' } } })
  csrfEndpoint(@Req() req: Request, @Res({ passthrough: true }) res: Response): { csrfToken: string } {
    const token = this.csrf.setOrGetCsrfToken(req, res);
    return { csrfToken: token };
  }
}