# All files / modules/bgm bgm.controller.ts

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     import Router from '@koa/router';
    import { bgmService } from './bgm.service';

    const router = new Router();

    /**
     * 获取背景音乐列表
     * GET /api/bgm
     */
    router.get('/', async (ctx) => {
      try {
        const { mood } = ctx.query as { mood?: string };

        let bgmList;
        if (mood) {
          bgmList = bgmService.getBgmByMood(mood);
        } else {
          bgmList = bgmService.getBgmList();
        }

        ctx.body = {
          code: 0,
          message: 'success',
          data: bgmList,
        };
      } catch (error: any) {
        ctx.body = {
          code: 400,
          message: error.message || '获取背景音乐列表失败',
        };
      }
    });

    /**
     * 获取所有风格
     * GET /api/bgm/moods
     */
    router.get('/moods', async (ctx) => {
      try {
        const moods = bgmService.getMoods();
        ctx.body = {
          code: 0,
          message: 'success',
          data: moods,
        };
      } catch (error: any) {
        ctx.body = {
          code: 400,
          message: error.message || '获取风格列表失败',
        };
      }
    });

    /**
     * 获取单个背景音乐
     * GET /api/bgm/:id
     */
    router.get('/:id', async (ctx) => {
      try {
        const { id } = ctx.params;
        const bgm = bgmService.getBgmById(parseInt(id));

        if (!bgm) {
          ctx.body = {
            code: 404,
            message: '背景音乐不存在',
          };
          return;
        }

        ctx.body = {
          code: 0,
          message: 'success',
          data: bgm,
        };
      } catch (error: any) {
        ctx.body = {
          code: 400,
          message: error.message || '获取背景音乐失败',
        };
      }
    });

    /**
     * 添加背景音乐
     * POST /api/bgm
     */
    router.post('/', async (ctx) => {
      try {
        const { name, url, mood, duration } = ctx.request.body as {
          name: string;
          url: string;
          mood: string;
          duration: number;
        };

        if (!name || !url || !mood || !duration) {
          ctx.body = {
            code: 400,
            message: '缺少必填字段',
          };
          return;
        }

        const bgm = bgmService.addBgm({ name, url, mood, duration });
        ctx.body = {
          code: 0,
          message: 'success',
          data: bgm,
        };
      } catch (error: any) {
        ctx.body = {
          code: 400,
          message: error.message || '添加背景音乐失败',
        };
      }
    });

    /**
     * 更新背景音乐
     * PUT /api/bgm/:id
     */
    router.put('/:id', async (ctx) => {
      try {
        const { id } = ctx.params;
        const { name, url, mood, duration, size } = ctx.request.body as {
          name?: string;
          url?: string;
          mood?: string;
          duration?: number;
          size?: number;
        };

        const bgm = bgmService.updateBgm(parseInt(id), { name, url, mood, duration, size });

        if (!bgm) {
          ctx.body = {
            code: 404,
            message: '背景音乐不存在',
          };
          return;
        }

        ctx.body = {
          code: 0,
          message: 'success',
          data: bgm,
        };
      } catch (error: any) {
        ctx.body = {
          code: 400,
          message: error.message || '更新背景音乐失败',
        };
      }
    });

    /**
     * 删除背景音乐
     * DELETE /api/bgm/:id
     */
    router.delete('/:id', async (ctx) => {
      try {
        const { id } = ctx.params;
        const success = bgmService.deleteBgm(parseInt(id));

        if (!success) {
          ctx.body = {
            code: 404,
            message: '背景音乐不存在',
          };
          return;
        }

        ctx.body = {
          code: 0,
          message: 'success',
        };
      } catch (error: any) {
        ctx.body = {
          code: 400,
          message: error.message || '删除背景音乐失败',
        };
      }
    });

    export default router;