package radio

import (
	"bytes"
	"crypto/md5"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"strconv"
	"time"

	"sundynix-go/global"
	"sundynix-go/model/radio"
	"sundynix-go/model/system"
	"sundynix-go/pkg/httpclient"
	"sundynix-go/utils/upload"

	"github.com/google/uuid"
)

// TTSRequest TTS请求参数
type TTSRequest struct {
	Text      string // 要转换的文本
	Speaker   string // 声音类型
	ProgramId string // 节目ID
}

// SubmitTTSTask 提交长文本TTS任务 (异步)
func (t *TTSService) SubmitTTSTask(req TTSRequest) (string, error) {
	if req.Text == "" {
		return "", fmt.Errorf("文本内容不能为空")
	}

	taskId, err := t.doSubmitTTSTask(req)
	if err != nil {
		return "", fmt.Errorf("提交TTS任务失败: %v", err)
	}

	go t.asyncProcessResult(req.ProgramId, taskId)
	return taskId, nil
}

// doSubmitTTSTask 提交任务
func (t *TTSService) doSubmitTTSTask(req TTSRequest) (string, error) {
	url := "https://openspeech.bytedance.com/api/v3/tts/submit"
	appID := global.Config.TTS.AppId
	accessKey := global.Config.TTS.AccessKey
	resourceID := global.Config.TTS.ResourceId
	if resourceID == "" {
		resourceID = "seed-tts-2.0"
	}
	speaker := req.Speaker
	if speaker == "" {
		speaker = "zh_male_dayi_uranus_bigtts"
	}

	bodyData := map[string]interface{}{
		"user":      map[string]interface{}{"uid": "123123"},
		"unique_id": uuid.New().String(),
		"req_params": map[string]interface{}{
			"text":    req.Text,
			"speaker": speaker,
			"audio_params": map[string]interface{}{
				"format":           "mp3",
				"sample_rate":      24000,
				"enable_timestamp": true,
			},
			"additions": "{}",
		},
	}
	jsonBody, _ := json.Marshal(bodyData)
	httpReq, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonBody))
	if err != nil {
		return "", err
	}
	httpReq.Header.Set("X-Api-App-Id", appID)
	httpReq.Header.Set("X-Api-Access-Key", accessKey)
	httpReq.Header.Set("X-Api-Resource-Id", resourceID)
	httpReq.Header.Set("X-Api-Request-Id", uuid.New().String())
	httpReq.Header.Set("Content-Type", "application/json")
	httpReq.Header.Set("Connection", "keep-alive")

	resp, err := httpclient.GetClient().Do(httpReq)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		respBytes, _ := io.ReadAll(resp.Body)
		return "", fmt.Errorf("请求失败, 状态码: %d, 返回: %s", resp.StatusCode, string(respBytes))
	}

	var result struct {
		Data struct {
			TaskId string `json:"task_id"`
		} `json:"data"`
		Message string `json:"message"`
	}
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		return "", err
	}
	if result.Data.TaskId == "" {
		return "", fmt.Errorf("未能获取任务ID: %s", result.Message)
	}
	return result.Data.TaskId, nil
}

// asyncProcessResult 异步处理TTS结果
func (t *TTSService) asyncProcessResult(programId, taskId string) {
	resultUrl, err := t.waitForResult(taskId)
	if err != nil {
		global.Logger.Error(fmt.Sprintf("TTS任务失败, TaskId: %s, Error: %v", taskId, err))
		global.DB.Model(&radio.RadioProgram{}).Where("id = ?", programId).Update("audio_status", 0)
		return
	}

	audioData, err := t.downloadAudio(resultUrl)
	if err != nil {
		global.Logger.Error(fmt.Sprintf("下载音频失败, TaskId: %s, Error: %v", taskId, err))
		global.DB.Model(&radio.RadioProgram{}).Where("id = ?", programId).Update("audio_status", 0)
		return
	}

	audioId, err := t.uploadToOSS(audioData, programId)
	if err != nil {
		global.Logger.Error(fmt.Sprintf("上传OSS失败, TaskId: %s, Error: %v", taskId, err))
		global.DB.Model(&radio.RadioProgram{}).Where("id = ?", programId).Update("audio_status", 0)
		return
	}

	if err := global.DB.Model(&radio.RadioProgram{}).Where("id = ?", programId).
		Updates(map[string]interface{}{
			"audio_id":     audioId,
			"audio_status": 2, // 音频就绪
		}).Error; err != nil {
		global.Logger.Error(fmt.Sprintf("更新节目音频ID失败, TaskId: %s, Error: %v", taskId, err))
		global.DB.Model(&radio.RadioProgram{}).Where("id = ?", programId).Update("audio_status", 0)
		return
	}

	global.Logger.Info(fmt.Sprintf("TTS任务完成, TaskId: %s, ProgramId: %s, AudioId: %s", taskId, programId, audioId))
}

// waitForResult 轮询查询任务结果，返回音频下载URL
func (t *TTSService) waitForResult(taskId string) (string, error) {
	maxRetries := 10
	interval := 30 * time.Second

	for i := 0; i < maxRetries; i++ {
		time.Sleep(interval)
		resultUrl, status, statusMsg, err := t.queryTaskResult(taskId)
		if err != nil {
			return "", err
		}
		switch status {
		case 1:
			return resultUrl, nil
		case 2:
			return "", fmt.Errorf("TTS合成失败: %s", statusMsg)
		default:
			global.Logger.Debug(fmt.Sprintf("TTS任务处理中, TaskId: %s, 重试次数: %d", taskId, i+1))
		}
	}
	return "", fmt.Errorf("TTS任务超时, TaskId: %s", taskId)
}

// queryTaskResult 查询任务状态
func (t *TTSService) queryTaskResult(taskId string) (string, int, string, error) {
	url := "https://openspeech.bytedance.com/api/v3/tts/query"
	appID := global.Config.TTS.AppId
	accessKey := global.Config.TTS.AccessKey
	resourceID := global.Config.TTS.ResourceId
	if resourceID == "" {
		resourceID = "seed-tts-2.0"
	}

	bodyData := map[string]interface{}{"task_id": taskId}
	jsonBody, _ := json.Marshal(bodyData)
	httpReq, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonBody))
	if err != nil {
		return "", 0, "", err
	}

	httpReq.Header.Set("X-Api-App-Id", appID)
	httpReq.Header.Set("X-Api-Access-Key", accessKey)
	httpReq.Header.Set("X-Api-Resource-Id", resourceID)
	httpReq.Header.Set("X-Api-Request-Id", uuid.New().String())
	httpReq.Header.Set("Content-Type", "application/json")
	httpReq.Header.Set("Connection", "keep-alive")

	resp, err := httpclient.GetClient().Do(httpReq)
	if err != nil {
		return "", 0, "", err
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		respBytes, _ := io.ReadAll(resp.Body)
		return "", 0, "", fmt.Errorf("查询任务失败, 状态码: %d, 返回: %s", resp.StatusCode, string(respBytes))
	}

	respBytes, _ := io.ReadAll(resp.Body)
	global.Logger.Info(fmt.Sprintf("火山查询原始结果: %s", string(respBytes)))

	var result struct {
		Data    map[string]interface{} `json:"data"`
		Message string                 `json:"message"`
	}
	if err := json.Unmarshal(respBytes, &result); err != nil {
		return "", 0, "", err
	}

	status := 0
	audioUrl := ""

	if result.Data != nil {
		// 官方文档定义:
		// 1: Running (正在处理)
		// 2: Success (处理成功)
		// 3: Failure (处理失败)

		volcStatus := 0
		if statusVal, ok := result.Data["task_status"].(float64); ok {
			volcStatus = int(statusVal)
		} else if statusStr, ok := result.Data["task_status"].(string); ok {
			if statusStr == "1" {
				volcStatus = 1
			} else if statusStr == "2" || statusStr == "success" || statusStr == "done" {
				volcStatus = 2
			} else if statusStr == "3" || statusStr == "failed" || statusStr == "error" {
				volcStatus = 3
			}
		}

		// 映射到内部状态: 0: 处理中, 1: 成功, 2: 失败
		if volcStatus == 1 {
			status = 0 // Running
		} else if volcStatus == 2 {
			status = 1 // Success
		} else if volcStatus == 3 {
			status = 2 // Failure
		}

		if val, ok := result.Data["audio_url"].(string); ok {
			audioUrl = val
		} else if val, ok := result.Data["audio"].(string); ok {
			audioUrl = val
		}
	}

	if audioUrl != "" {
		status = 1
	}

	if status == 1 && audioUrl == "" {
		// 任务状态为1时如果没有url，继续等待(轮询)避免直接返回空URL使下载失败
		status = 0
	}

	return audioUrl, status, result.Message, nil
}

// TTSService TTS服务
type TTSService struct{}

var TTSServiceApp = new(TTSService)

// downloadAudio 从URL下载音频数据
func (t *TTSService) downloadAudio(audioUrl string) ([]byte, error) {
	resp, err := httpclient.GetClient().Get(audioUrl)
	if err != nil {
		return nil, fmt.Errorf("下载音频失败: %v", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("下载音频HTTP错误: %d", resp.StatusCode)
	}

	audioData, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("读取音频数据失败: %v", err)
	}

	return audioData, nil
}

// uploadToOSS 上传音频到OSS并保存到数据库
func (t *TTSService) uploadToOSS(audioData []byte, programId string) (string, error) {
	instance := upload.OssInstance()
	minioClient, ok := instance.(*upload.Minio)
	if !ok {
		return "", fmt.Errorf("获取MinIO客户端失败")
	}
	timestamp := time.Now().UnixMicro()
	timestr := strconv.FormatInt(timestamp, 10)
	key := fmt.Sprintf("audio/%s/%s.mp3", time.Now().Format("2006-01-02"), programId+"-"+timestr)
	filename := fmt.Sprintf("program-%s.mp3", programId)

	fileURL, err := minioClient.UploadBytes(audioData, key, "audio/mpeg")
	if err != nil {
		return "", fmt.Errorf("上传文件到OSS失败: %v", err)
	}

	hashStr := fmt.Sprintf("%x", md5.Sum(audioData))

	oss := system.Oss{
		Name:   filename,
		Url:    fileURL,
		Key:    key,
		Suffix: "mp3",
		Tag:    "mp3",
		MD5:    hashStr,
	}
	if err := global.DB.Create(&oss).Error; err != nil {
		return "", fmt.Errorf("保存文件记录失败: %v", err)
	}

	return oss.Id, nil
}