package video

import (
	"context"
	"encoding/json"
	"sort"
	"strconv"
	"strings"
	"time"

	dto "media/model/dto/video"
	entity "media/model/entity/video"

	"gitea.redpowerfuture.com/red-future/common/db/gfdb"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/util/gconv"
)

var SceneSplitTask = new(sceneSplitTaskDao)

type sceneSplitTaskDao struct{}

const sceneSplitTaskTable = "scene_split_task"

// Insert 创建任务（排除 id 字段，让数据库自增）
func (d *sceneSplitTaskDao) Insert(ctx context.Context, data *entity.SceneSplitTask) (id int64, err error) {
	r, err := gfdb.DB(ctx).Model(ctx, sceneSplitTaskTable).
		Data(data).
		FieldsEx(entity.SceneSplitTaskCols.Id).
		Insert()
	if err != nil {
		return 0, err
	}
	return r.LastInsertId()
}

// GetByTaskID 根据taskId查询任务
func (d *sceneSplitTaskDao) GetByTaskID(ctx context.Context, taskID string) (res *entity.SceneSplitTask, err error) {
	r, err := gfdb.DB(ctx).Model(ctx, sceneSplitTaskTable).
		Where(entity.SceneSplitTaskCols.TaskID, taskID).
		One()
	if err != nil {
		return nil, err
	}
	if r == nil {
		return nil, nil
	}
	err = r.Struct(&res)
	return
}

// UpdateRunning 更新为运行中
func (d *sceneSplitTaskDao) UpdateRunning(ctx context.Context, taskID string) error {
	_, err := gfdb.DB(ctx).Model(ctx, sceneSplitTaskTable).
		Data(g.Map{
			entity.SceneSplitTaskCols.Status: "running",
		}).
		Where(entity.SceneSplitTaskCols.TaskID, taskID).
		Update()
	return err
}

// UpdateSuccess 更新为成功
func (d *sceneSplitTaskDao) UpdateSuccess(ctx context.Context, taskID string, segmentURLs, audioURL string, sceneCount int, audioDuration float64, videoDuration float64) error {
	_, err := gfdb.DB(ctx).Model(ctx, sceneSplitTaskTable).
		Data(g.Map{
			entity.SceneSplitTaskCols.Status:        "success",
			entity.SceneSplitTaskCols.SegmentURLs:   segmentURLs,
			entity.SceneSplitTaskCols.AudioURL:      audioURL,
			entity.SceneSplitTaskCols.SceneCount:    sceneCount,
			entity.SceneSplitTaskCols.AudioDuration: audioDuration,
			entity.SceneSplitTaskCols.VideoDuration: videoDuration,
			entity.SceneSplitTaskCols.ErrorMessage:  "",
		}).
		Where(entity.SceneSplitTaskCols.TaskID, taskID).
		Update()
	return err
}

// UpdateError 更新为失败
func (d *sceneSplitTaskDao) UpdateError(ctx context.Context, taskID string, errMsg string) error {
	_, err := gfdb.DB(ctx).Model(ctx, sceneSplitTaskTable).
		Data(g.Map{
			entity.SceneSplitTaskCols.Status:       "failed",
			entity.SceneSplitTaskCols.ErrorMessage: errMsg,
		}).
		Where(entity.SceneSplitTaskCols.TaskID, taskID).
		Update()
	return err
}

// EntityToSceneSplitTaskRes 实体转DTO
func EntityToSceneSplitTaskRes(e *entity.SceneSplitTask) *dto.GetSceneSplitTaskRes {
	res := &dto.GetSceneSplitTaskRes{
		TaskID:        e.TaskID,
		Status:        e.Status,
		SceneCount:    e.SceneCount,
		AudioDuration: e.AudioDuration,
		VideoDuration: e.VideoDuration,
	}
	if e.CreatedAt != nil {
		res.CreatedAt = gconv.Int64(e.CreatedAt.Timestamp())
	} else {
		res.CreatedAt = time.Now().UnixMilli()
	}
	if e.Status == "success" {
		res.AudioURL = e.AudioURL
		res.Segments = ParseSegmentEntries(e.SegmentURLs)
		res.SceneCount = e.SceneCount
		res.AudioDuration = e.AudioDuration
		res.VideoDuration = e.VideoDuration
	}
	if e.Status == "failed" {
		res.ErrorMessage = e.ErrorMessage
	}
	return res
}

// ParseSegmentEntries 将 JSON 数组解析为按时间线排序的 SegmentEntry 切片
// JSON 格式: [{"timeline":"0.0-7.2","url":"..."}, ...]
func ParseSegmentEntries(jsonStr string) []dto.SegmentEntry {
	if jsonStr == "" {
		return nil
	}

	// 先尝试解析为数组格式
	var entries []dto.SegmentEntry
	if err := json.Unmarshal([]byte(jsonStr), &entries); err == nil && len(entries) > 0 {
		// 按起始时间排序确保有序
		sort.Slice(entries, func(i, j int) bool {
			return extractStartTime(entries[i].Timeline) < extractStartTime(entries[j].Timeline)
		})
		return entries
	}

	// 兼容旧的 map 格式 {"0.0-7.2":"url", ...}
	var m map[string]string
	if err := json.Unmarshal([]byte(jsonStr), &m); err != nil {
		return nil
	}
	entries = make([]dto.SegmentEntry, 0, len(m))
	for timeline, url := range m {
		entries = append(entries, dto.SegmentEntry{Timeline: timeline, URL: url})
	}
	sort.Slice(entries, func(i, j int) bool {
		return extractStartTime(entries[i].Timeline) < extractStartTime(entries[j].Timeline)
	})
	return entries
}

// extractStartTime 从时间线 key（如 "0.0-7.2"）提取起始秒数用于排序
func extractStartTime(timeline string) float64 {
	idx := strings.Index(timeline, "-")
	if idx < 0 {
		return 0
	}
	v, _ := strconv.ParseFloat(timeline[:idx], 64)
	return v
}