import { Controller, Post, Body, UnauthorizedException } from '@nestjs/common';
import { AuthService } from './auth.service';
import { UsersService } from '../users/users.service';
import { ApiTags, ApiOperation, ApiBody, ApiResponse, ApiBearerAuth } from '@nestjs/swagger';

class LoginDto {
  username: string;
  password: string;
}

class LoginResponse {
  access_token: string;
}

class RegisterDto {
  username: string;
  email: string;
  password: string;
}

@ApiTags('Auth')
@Controller('auth')
export class AuthController {
  constructor(
    private authService: AuthService,
    private usersService: UsersService,
  ) {}

  @ApiOperation({ summary: 'Register new user' })
  @ApiBody({
    description: 'User registration data',
    type: RegisterDto,
    examples: {
      example1: {
        summary: 'Typical registration',
        value: {
          username: 'john_doe',
          email: 'john@example.com',
          password: '123456',
        },
      },
    },
  })
  @ApiResponse({
    status: 201,
    description: 'User created successfully',
  })
  @ApiResponse({
    status: 409,
    description: 'Username already exists',
  })
  @Post('register')
  async register(@Body() body: RegisterDto) {
    const existing = await this.usersService.findOneByUsername(body.username);
    if (existing) {
      throw new UnauthorizedException('Username already exists');
    }
    return this.usersService.create(body);
  }

  @ApiOperation({ summary: 'Login user' })
  @ApiBody({
    description: 'User login data',
    type: LoginDto,
    examples: {
      example1: {
        summary: 'Typical login',
        value: {
          username: 'john_doe',
          password: '123456',
        },
      },
    },
  })
  @ApiResponse({
    status: 200,
    description: 'User logged in successfully',
    type: LoginResponse,
  })
  @ApiResponse({
    status: 401,
    description: 'Invalid username or password',
  })
  @Post('login')
  async login(@Body() body: LoginDto) {
    const user = await this.authService.validateUser(body.username, body.password);
    return this.authService.login(user);
  }
}