import Router from '@koa/router';
import { Context } from 'koa';
import * as TtsService from './tts.service';
import { BadRequestError, NotFoundError } from '../../middleware/errorHandler';
import { optionalAuth } from '../../middleware/auth';
import { usageLimitMiddleware, checkWordLimit } from '../../middleware/usageLimit';
import { prisma } from '../../models';

const router = new Router();

// 获取可用音色列表
router.get('/voices', async (ctx: Context) => {
  const voices = TtsService.getVoices();

  ctx.body = {
    code: 0,
    message: 'success',
    data: { voices },
  };
});

// 测试 MySQL 连接
router.get('/test-db', async (ctx: Context) => {
  try {
    const count = await prisma.book.count();
    ctx.body = {
      code: 0,
      message: 'success',
      data: { count, connectionState: 'connected' },
    };
  } catch (error: any) {
    ctx.body = {
      code: 500,
      message: 'error',
      data: { error: error.message },
    };
  }
});

// 生成音频（异步模式）
router.post(
  '/generate',
  optionalAuth,
  async (ctx: Context) => {
    const userId = ctx.state.user?.userId;
    const { text, voiceId, voiceParams, bookId, chapterTitle } = ctx.request.body as {
      text: string;
      voiceId: string;
      voiceParams?: { speed?: number; pitch?: number; volume?: number };
      bookId?: string;
      chapterTitle?: string;
    };

    // 调试日志
    console.log('📥 收到 TTS 请求:', { textLength: text?.length, voiceId, voiceParams, bookId, chapterTitle });

    // 参数验证
    if (!text || text.trim().length === 0) {
      throw new BadRequestError('请输入要转换的文本');
    }

    if (!voiceId) {
      throw new BadRequestError('请选择音色');
    }

    // 如果指定了 bookId，验证书籍是否存在
    if (bookId) {
      const book = await prisma.book.findUnique({ where: { id: parseInt(bookId) } });
      if (!book) {
        throw new NotFoundError('书籍不存在');
      }
    }

    // 检查字数限制（测试模式：无限制）
    const wordCount = text.length;
    const quota = ctx.state.userQuota || { dailyLimit: -1, wordLimit: -1 };

    if (quota.wordLimit !== -1 && wordCount > quota.wordLimit) {
      throw new BadRequestError(`文本字数超出限制（${quota.wordLimit}字）`);
    }

    // 默认参数
    const params = {
      speed: voiceParams?.speed || 1.0,
      pitch: voiceParams?.pitch || 0,
      volume: voiceParams?.volume || 50,
    };

    // 异步生成音频（立即返回）
    const result = await TtsService.generateAudio(userId, text, voiceId, params, undefined, {
      bookId,
      chapterTitle,
    });

    // 如果用户已登录，更新使用次数
    if (userId) {
      const user = await prisma.user.findUnique({ where: { id: parseInt(userId) } });
      if (user) {
        await prisma.user.update({
          where: { id: parseInt(userId) },
          data: { dailyUsage: user.dailyUsage + 1 },
        });
      }
    }

    ctx.body = {
      code: 0,
      message: '音频生成任务已创建',
      data: result, // { audioId, audioUrl: '' }
    };
  }
);

// 获取音频生成状态
router.get('/status/:audioId', async (ctx: Context) => {
  const { audioId } = ctx.params;
  const result = await TtsService.getAudioStatus(audioId);

  if (result.status === 'not_found') {
    throw new NotFoundError('音频不存在');
  }

  ctx.body = {
    code: 0,
    message: 'success',
    data: result,
  };
});

// 预览音色 - 生成短音频
router.post('/preview', async (ctx: Context) => {
  const { voiceId, voiceParams } = ctx.request.body as {
    voiceId: string;
    voiceParams?: { speed?: number; pitch?: number; volume?: number };
  };

  if (!voiceId) {
    throw new BadRequestError('请选择音色');
  }

  // 预览文本（固定短文本）
  const previewText = '你好，欢迎使用AI有声书';

  try {
    // 生成预览音频
    const result = await TtsService.generatePreview(voiceId, voiceParams);

    ctx.body = {
      code: 0,
      message: 'success',
      data: {
        previewText,
        voiceId,
        audioUrl: result.audioUrl,
      },
    };
  } catch (error: any) {
    ctx.body = {
      code: 500,
      message: '预览生成失败：' + error.message,
      data: null,
    };
  }
});

export default router;