import {
  Controller,
  Get,
  Param,
  Query,
  Post,
  Body,
  UseGuards,
  Req,
  UnauthorizedException,
} from '@nestjs/common';
import {
  ApiOperation,
  ApiQuery,
  ApiResponse,
  ApiTags,
  ApiBearerAuth,
} from '@nestjs/swagger';
import { Request } from 'express';
import { VideoService } from './video.service';
import {
  VideoDetailDto,
  VideoCategoryWithTagsResponseDto,
  VideoListRequestDto,
  VideoListResponseDto,
  VideoSearchByTagRequestDto,
  VideoClickDto,
  RecommendedVideosDto,
} from './dto';
import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';

interface JwtUser {
  uid: string;
  sub?: string;
  jti?: string;
}

interface RequestWithUser extends Request {
  user?: JwtUser;
}

@ApiTags('视频')
@Controller('video')
export class VideoController {
  constructor(private readonly videoService: VideoService) {}

  /**
   * GET /api/v1/video/recommended
   *
   * Get recommended videos from Redis.
   */
  @Get('recommended')
  @ApiOperation({
    summary: '获取推荐视频列表',
    description: '从 Redis 获取推荐视频列表。',
  })
  @ApiResponse({
    status: 200,
    description: '推荐视频列表',
    type: RecommendedVideosDto,
  })
  async getRecommendedVideos(
    @Req() req: RequestWithUser,
  ): Promise<RecommendedVideosDto> {
    const uid = req.user?.uid;

    if (!uid) {
      throw new UnauthorizedException('Missing uid in JWT payload');
    }

    const ip = this.getClientIp(req);
    const userAgent = this.getUserAgent(req);
    return this.videoService.getRecommendedVideos();
  }

  /**
   * GET /api/v1/video/category/:channelId/:categoryId/latest
   *
   * Get latest videos for a category from Redis.
   */
  @Get('category/:channelId/:categoryId/latest')
  @ApiOperation({
    summary: '获取分类最新视频',
    description: '从 Redis 获取指定频道和分类的最新视频列表。',
  })
  @ApiResponse({
    status: 200,
    description: '最新视频列表',
    type: VideoDetailDto,
    isArray: true,
  })
  async getLatestVideosByCategory(
    @Param('channelId') channelId: string,
    @Param('categoryId') categoryId: string,
  ): Promise<VideoDetailDto[]> {
    return this.videoService.getLatestVideosByCategory(categoryId);
  }

  /**
   * GET /api/v1/video/categories-with-tags
   *
   * Get all video categories with their associated tags.
   * Returns categories fetched from Redis cache (app:category:all),
   * with tags for each category fetched from (box:app:tag:list:{categoryId}).
   */
  @Get('categories-with-tags')
  @ApiOperation({
    summary: '获取所有分类及其标签',
    description:
      '返回所有视频分类及其关联的标签。数据来源：Redis 缓存（由 box-mgnt-api 构建）。',
  })
  @ApiResponse({
    status: 200,
    description: '分类及其标签列表',
    type: VideoCategoryWithTagsResponseDto,
  })
  async getCategoriesWithTags(): Promise<VideoCategoryWithTagsResponseDto> {
    return this.videoService.getCategoriesWithTags();
  }

  /**
   * POST /api/v1/video/list
   *
   * Get paginated list of videos for a category with optional tag filtering.
   * Request body contains page, size, categoryId, and optional tagName.
   * Returns paginated video list with metadata.
   */
  @Post('list')
  @ApiOperation({
    summary: '分页获取视频列表',
    description:
      '按分类（和可选的标签）分页获取视频列表。支持按页码和每页数量分页。',
  })
  @ApiResponse({
    status: 200,
    description: '成功返回分页视频列表',
    type: VideoListResponseDto,
  })
  async getVideoList(
    @Body() req: VideoListRequestDto,
  ): Promise<VideoListResponseDto> {
    return this.videoService.getVideoList(req);
  }

  /**
   * POST /api/v1/video/search-by-tag
   *
   * Search videos by tag name across all categories.
   * Collects all videos tagged with the specified tag name from all categories.
   */
  @Post('search-by-tag')
  @ApiOperation({
    summary: '按标签名称全局搜索视频',
    description: '跨所有分类搜索具有指定标签名称的视频，返回分页结果。',
  })
  @ApiResponse({
    status: 200,
    description: '成功返回搜索结果',
    type: VideoListResponseDto,
  })
  async searchByTag(
    @Body() req: VideoSearchByTagRequestDto,
  ): Promise<VideoListResponseDto> {
    return this.videoService.searchVideosByTagName(req);
  }

  /**
   * POST /video/click
   *
   * Record video click event for analytics.
   * Protected endpoint that requires JWT authentication.
   */
  @Post('click')
  @UseGuards(JwtAuthGuard)
  @ApiBearerAuth()
  @ApiOperation({
    summary: '视频点击事件上报',
    description:
      '记录视频点击事件（uid/IP/UA 由服务端填充，不接受客户端时间戳）。',
  })
  @ApiResponse({
    status: 200,
    description: '成功',
    schema: { example: { status: 1, code: 'OK' } },
  })
  @ApiResponse({ status: 401, description: '未授权 - 需要JWT token' })
  async recordVideoClick(
    @Body() body: VideoClickDto,
    @Req() req: RequestWithUser,
  ): Promise<{ status: number; code: string }> {
    const uid = req.user?.uid;

    if (!uid) {
      throw new UnauthorizedException('Missing uid in JWT payload');
    }

    const ip = this.getClientIp(req);
    const userAgent = this.getUserAgent(req);

    await this.videoService.recordVideoClick(uid, body, ip, userAgent);

    return { status: 1, code: 'OK' };
  }

  private getClientIp(req: Request): string {
    return (
      (req.headers['x-forwarded-for'] as string)?.split(',')[0]?.trim() ||
      (req.headers['x-real-ip'] as string) ||
      req.ip ||
      req.socket?.remoteAddress ||
      'unknown'
    );
  }

  private getUserAgent(req: Request): string {
    return (req.headers['user-agent'] as string) || 'unknown';
  }
}