import { Controller, Get, Param, Query } from '@nestjs/common';
import { CurrentUser, Public, type AuthPrincipal } from '../../common/auth';
import { AppError } from '../../common/errors';
import { CoursesService } from './courses.service';

@Controller('v1')
export class CoursesController {
  constructor(private readonly courses: CoursesService) {}

  @Get('courses')
  list(@CurrentUser() user: AuthPrincipal) {
    return this.courses.list(user.id);
  }

  @Get('courses/:code')
  detail(@CurrentUser() user: AuthPrincipal, @Param('code') code: string) {
    return this.courses.detail(user.id, code);
  }

  @Get('courses/:code/lessons')
  lessons(@CurrentUser() user: AuthPrincipal, @Param('code') code: string) {
    return this.courses.lessons(user.id, code);
  }

  @Get('courses/:code/play')
  play(
    @CurrentUser() user: AuthPrincipal,
    @Param('code') code: string,
    @Query('chapterId') chapterId?: string,
    @Query('playId') playId?: string,
  ) {
    if (!chapterId || !playId) throw AppError.badRequest('参数错误：缺少 chapterId 或 playId');
    return this.courses.playUrl(user.id, code, chapterId, playId);
  }

  @Public()
  @Get('free-lessons')
  freeLessons(@Query('seriesNo') seriesNo?: string) {
    if (seriesNo === undefined || seriesNo === '') return this.courses.freeLessons();
    const n = Number(seriesNo);
    return this.courses.freeLessons(Number.isFinite(n) ? n : undefined);
  }
}