import { Controller, Get, Post, Param, Req, Inject, HttpStatus, Res } from '@nestjs/common';
import { ApiOperation, ApiResponse, ApiTags } from '@nestjs/swagger';
import type { Response } from 'express';

import { NotificationsService } from './NotificationsService';

type AuthenticatedRequest = {
  user?: { userId: string };
};

@ApiTags('notifications')
@Controller('notifications')
export class NotificationsController {
  constructor(
    @Inject(NotificationsService) private readonly notificationsService: NotificationsService,
  ) {}

  @Get('unread')
  @ApiOperation({ summary: 'Get unread notifications for current user' })
  @ApiResponse({ status: 200, description: 'List of unread notifications' })
  @ApiResponse({ status: 401, description: 'Unauthorized' })
  async getUnreadNotifications(
    @Req() req: AuthenticatedRequest,
    @Res() res: Response,
  ): Promise<void> {
    const userId = req.user?.userId;
    if (!userId) {
      res.status(HttpStatus.UNAUTHORIZED).json({ error: 'Unauthorized' });
      return;
    }

    const notifications = await this.notificationsService.getUnreadNotifications(userId);
    res.status(HttpStatus.OK).json({ notifications });
  }

  @Post('read/:notificationId')
  @ApiOperation({ summary: 'Mark notification as read' })
  @ApiResponse({ status: 200, description: 'Notification marked as read' })
  @ApiResponse({ status: 401, description: 'Unauthorized' })
  async markAsRead(
    @Param('notificationId') notificationId: string,
    @Req() req: AuthenticatedRequest,
    @Res() res: Response,
  ): Promise<void> {
    const userId = req.user?.userId;
    if (!userId) {
      res.status(HttpStatus.UNAUTHORIZED).json({ error: 'Unauthorized' });
      return;
    }

    await this.notificationsService.markAsRead(notificationId, userId);
    res.status(HttpStatus.OK).json({ success: true });
  }

  @Get('all')
  @ApiOperation({ summary: 'Get all notifications for current user' })
  @ApiResponse({ status: 200, description: 'List of all notifications' })
  @ApiResponse({ status: 401, description: 'Unauthorized' })
  async getAllNotifications(
    @Req() req: AuthenticatedRequest,
    @Res() res: Response,
  ): Promise<void> {
    const userId = req.user?.userId;
    if (!userId) {
      res.status(HttpStatus.UNAUTHORIZED).json({ error: 'Unauthorized' });
      return;
    }

    const notifications = await this.notificationsService.getAllNotifications(userId);
    res.status(HttpStatus.OK).json({ notifications });
  }
}