package job

import (
	"audio_transcoder/internal/svc"
	"audio_transcoder/internal/types"
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"github.com/google/uuid"
	"github.com/zeromicro/go-zero/core/logx"
	"io"
	"net/http"
	"os"
	"silk2audio/silk"
	"strings"
	"sync"
)

var (
	StopTranscoderError = errors.New("stop transcoder")
)

type CallbackReq struct {
	types.CallbackRequest
	FailNum int `json:"fail_num"`
}

// AutoTranscoder 自动处理队列
func AutoTranscoder(ctx *svc.ServiceContext) {
	sdk := ctx.BoltSdk
	for {
		key, value, err := sdk.GetFirst()
		if err != nil || key == "" || value == "" {
			continue
		}
		logx.Info("转码信息 data:", value)
		var req CallbackReq
		err = json.Unmarshal([]byte(value), &req)
		if err != nil {
			logx.Error(err)
			continue
		}
		//业务处理
		resp, err := Transcoder(ctx, &req.CallbackRequest)
		logx.Info("转码结果 data:", resp, err)
		if err != nil {
			logx.Error(err)
			_ = sdk.Delete(key)
			//重新放入队列
			req.FailNum++
			if err != StopTranscoderError && req.FailNum < 3 {
				b, _ := json.Marshal(&req)
				logx.Info("转码失败！重新放入队列 data:", string(b))
				_ = sdk.Set(uuid.NewString(), string(b))
			}
			continue
		}
		_ = sdk.Delete(key)
		//数据回调
		if req.CallbackUrl != "" {
			bts, _ := json.Marshal(resp)
			body, err := http.Post(req.CallbackUrl, "application/json", bytes.NewBuffer(bts))
			if err != nil {
				logx.Error(err)
				continue
			}
			if body.StatusCode != http.StatusOK {
				logx.Errorf("post %v fail, ErrorCode %v", req.CallbackUrl, body.StatusCode)
				continue
			}
		}
	}
}

// Transcoder 转码
func Transcoder(svcCtx *svc.ServiceContext, req *types.CallbackRequest) (resp *types.OriginDataResponse, err error) {
	fmt.Println("转码中...")
	if req.Path == "" {
		err = StopTranscoderError
		return
	}
	// 去除空格
	req.Path = strings.TrimSpace(req.Path)
	req.CallbackUrl = strings.TrimSpace(req.CallbackUrl)
	resp = &types.OriginDataResponse{OriginData: req.OriginData}
	// 发起HTTP GET请求
	resp1, err := http.Get(req.Path)
	if err != nil {
		logx.Errorf("下载文件失败 error:%s", err.Error())
		return
	}
	defer resp1.Body.Close()
	if resp1.StatusCode != http.StatusOK {
		err = errors.New("download file failed")
		logx.Errorf("下载文件失败 error:%v", resp1.StatusCode)
		return
	}
	// 读取响应体内容
	inputPath := uuid.NewString() // 本地保存的文件路径
	inputFile, err := os.Create(inputPath)
	if err != nil {
		logx.Errorf("读取文件失败 error:%s", err.Error())
		return
	}
	_, err = io.Copy(inputFile, resp1.Body)
	inputFile.Close()
	if err != nil {
		logx.Errorf("读取文件失败 error:%s", err.Error())
		return
	}
	//判断文件类型，如果不是指定语音则返回
	inputFile, _ = os.Open(inputPath)
	var inputType int // 1:silk 2:mp3
	var buf = make([]byte, 10)
	if _, err = inputFile.Read(buf); err == nil {
		inputFile.Close()
		if bytes.Equal(buf, []byte{2, 35, 33, 83, 73, 76, 75, 95, 86, 51}) {
			os.Rename(inputPath, inputPath+".silk")
			inputType = 1
			inputPath += ".silk"
		} else if bytes.Equal(buf[:5], []byte{35, 33, 65, 77, 82}) {
			os.Rename(inputPath, inputPath+".mp3")
			inputType = 2
			inputPath += ".mp3"
		}
		defer silk.FileRemove(inputPath)
	}
	if inputType == 0 {
		err = StopTranscoderError
		return
	}
	// 转码
	var wavPath, pcmPath string
	if inputType == 1 {
		wavPath, pcmPath = silk.TransSilkToWav(inputPath)
	} else if inputType == 2 {
		wavPath, pcmPath = silk.TransMp3ToWav(inputPath)
	}
	defer silk.FileRemove(wavPath)
	defer silk.FileRemove(pcmPath)
	//多线程处理上传录音和语音识别
	var wg sync.WaitGroup
	wg.Add(2)
	//构建返回数据
	var err1, err2 error
	//上传录音
	go func() {
		defer wg.Done()
		url, err := svcCtx.QiNiuSdk.Upload(wavPath, wavPath)
		if err != nil {
			logx.Errorf("上传七牛云失败 error:%s", err.Error())
			return
		}
		err1 = err
		resp.Path = url
	}()
	//识别录音
	go func() {
		defer wg.Done()
		bts, _ := os.ReadFile(pcmPath)
		asrResp, err := svcCtx.AsrSdk.Asr(bts, "pcm", 16000)
		if err != nil {
			logx.Errorf("语音识别失败 error:%s", err.Error())
			return
		}
		err2 = err
		resp.Message = strings.Join(asrResp.Result, "\n")
	}()
	wg.Wait()
	//返回数据
	if err1 != nil {
		return nil, err1
	}
	if err2 != nil {
		return nil, err2
	}
	fmt.Println("已转码...")
	return
}