import {
  Controller,
  Get,
  Post,
  Patch,
  Delete,
  Body,
  Param,
  Query,
  UseGuards,
  HttpCode,
  HttpStatus,
} from '@nestjs/common';
import {
  ApiTags,
  ApiOperation,
  ApiResponse,
  ApiBearerAuth,
  ApiQuery,
} from '@nestjs/swagger';
import { JwtAuthGuard } from '../auth/guards';
import { CurrentUser } from '../auth/decorators';
import { NotificationsService } from './notifications.service';
import { RegisterTokenDto, RemoveTokenDto } from './dto/register-token.dto';

@ApiTags('Notifications')
@Controller('notifications')
@UseGuards(JwtAuthGuard)
@ApiBearerAuth('JWT-auth')
export class NotificationsController {
  constructor(
    private readonly notificationsService: NotificationsService,
  ) {}

  // ==========================================
  // IN-APP NOTIFICATIONS
  // ==========================================

  @Get()
  @ApiOperation({ summary: 'Get notifications list' })
  @ApiQuery({ name: 'filter', required: false, enum: ['all', 'unread'] })
  @ApiQuery({ name: 'page', required: false, type: Number })
  @ApiQuery({ name: 'limit', required: false, type: Number })
  @ApiResponse({ status: 200, description: 'Notifications list with pagination' })
  async getNotifications(
    @CurrentUser('id') userId: string,
    @Query('filter') filter?: 'all' | 'unread',
    @Query('page') page?: string,
    @Query('limit') limit?: string,
  ) {
    return this.notificationsService.getNotifications(
      userId,
      filter || 'all',
      page ? parseInt(page, 10) : 1,
      limit ? parseInt(limit, 10) : 20,
    );
  }

  @Get('unread-count')
  @ApiOperation({ summary: 'Get unread notification count' })
  @ApiResponse({ status: 200, description: 'Unread count' })
  async getUnreadCount(@CurrentUser('id') userId: string) {
    const count = await this.notificationsService.getUnreadCount(userId);
    return { unreadCount: count };
  }

  @Patch(':id/read')
  @HttpCode(HttpStatus.OK)
  @ApiOperation({ summary: 'Mark a notification as read' })
  @ApiResponse({ status: 200, description: 'Notification marked as read' })
  async markAsRead(
    @CurrentUser('id') userId: string,
    @Param('id') notificationId: string,
  ) {
    await this.notificationsService.markAsRead(userId, notificationId);
    return null;
  }

  @Patch('read-all')
  @HttpCode(HttpStatus.OK)
  @ApiOperation({ summary: 'Mark all notifications as read' })
  @ApiResponse({ status: 200, description: 'All notifications marked as read' })
  async markAllAsRead(@CurrentUser('id') userId: string) {
    await this.notificationsService.markAllAsRead(userId);
    return null;
  }

  // ==========================================
  // FCM TOKEN MANAGEMENT
  // ==========================================

  @Post('fcm-token')
  @HttpCode(HttpStatus.OK)
  @ApiOperation({ summary: 'Register FCM token for push notifications' })
  @ApiResponse({ status: 200, description: 'Token registered' })
  async registerToken(
    @CurrentUser('id') userId: string,
    @Body() dto: RegisterTokenDto,
  ) {
    await this.notificationsService.registerToken(
      userId,
      dto.token,
      dto.device,
    );
    return null;
  }

  @Delete('fcm-token')
  @HttpCode(HttpStatus.OK)
  @ApiOperation({ summary: 'Remove FCM token' })
  @ApiResponse({ status: 200, description: 'Token removed' })
  async removeToken(
    @CurrentUser('id') userId: string,
    @Body() dto: RemoveTokenDto,
  ) {
    await this.notificationsService.removeToken(userId, dto.token);
    return null;
  }
}