package fs

import (
	"ZhenTuLocalPassiveAdapter/config"
	"ZhenTuLocalPassiveAdapter/dto"
	"ZhenTuLocalPassiveAdapter/util"
	"context"
	"fmt"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/codes"
	"os"
	"path"
	"sort"
	"time"
)

type LocalAdapter struct {
	StorageConfig config.StorageConfig
}

func (l *LocalAdapter) GetFileList(ctx context.Context, dirPath string, relDt time.Time) ([]dto.File, error) {
	subCtx, span := tracer.Start(ctx, "GetFileList_local")
	defer span.End()
	if l.StorageConfig.Path == "" {
		span.SetAttributes(attribute.String("error", "未配置存储路径"))
		span.SetStatus(codes.Error, "未配置存储路径")
		return nil, fmt.Errorf("未配置存储路径")
	}
	// 读取文件夹下目录
	files, err := os.ReadDir(path.Join(l.StorageConfig.Path, dirPath))
	if err != nil {
		span.SetAttributes(attribute.String("error", err.Error()))
		span.SetStatus(codes.Error, "文件夹读取失败")
		return nil, err
	}
	span.SetAttributes(attribute.Int("file.count", len(files)))

	var fileList []dto.File
	for _, file := range files {
		if file.IsDir() {
			continue
		}
		if !util.IsVideoFile(file.Name()) {
			continue
		}
		info, err := file.Info()
		if err != nil {
			continue
		}
		startTime, stopTime, err := util.ParseStartStopTime(info.Name(), relDt)
		if err != nil {
			continue
		}
		if startTime.Equal(stopTime) || stopTime.IsZero() {
			// 如果文件名没有时间戳，则认为该文件是未录制完成的
			// 尝试读取一下视频信息
			duration, err := util.GetVideoDuration(subCtx, path.Join(l.StorageConfig.Path, dirPath, file.Name()))
			if err != nil {
				// 如果还是没有，就按照配置文件里的加起来
				stopTime = stopTime.Add(time.Second * time.Duration(config.Config.Record.Duration))
			} else {
				stopTime = stopTime.Add(time.Second * time.Duration(duration))
			}
		}
		fileList = append(fileList, dto.File{
			BasePath:  l.StorageConfig.Path,
			Name:      file.Name(),
			Path:      dirPath,
			Url:       path.Join(l.StorageConfig.Path, dirPath, file.Name()),
			StartTime: startTime,
			EndTime:   stopTime,
		})
		sort.Slice(fileList, func(i, j int) bool {
			return fileList[i].StartTime.Before(fileList[j].StartTime)
		})
	}
	span.SetStatus(codes.Ok, "文件读取成功")
	return fileList, nil
}