package service

import (
	"context"
	"errors"
	"strconv"
	"strings"
	"time"

	"gorm.io/gorm"

	"github.com/ShukeBta/MediaStationGo/internal/model"
)

// SetFavorite 把 mediaID 标为 userID 的收藏。
func (e *EmbyService) SetFavorite(ctx context.Context, userID, mediaID string, favorite bool) error {
	if favorite {
		var f model.Favorite
		err := e.repo.DB.WithContext(ctx).
			Where("user_id = ? AND media_id = ?", userID, mediaID).First(&f).Error
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return e.repo.DB.WithContext(ctx).Create(&model.Favorite{
				UserID: userID, MediaID: mediaID,
			}).Error
		}
		return err
	}
	return e.repo.DB.WithContext(ctx).
		Where("user_id = ? AND media_id = ?", userID, mediaID).
		Delete(&model.Favorite{}).Error
}

// MarkPlayed 把 mediaID 标为已看（写一个 100% 进度的 history 行）。
func (e *EmbyService) MarkPlayed(ctx context.Context, userID, mediaID string, played bool) error {
	if !played {
		return e.repo.DB.WithContext(ctx).
			Where("user_id = ? AND media_id = ?", userID, mediaID).
			Delete(&model.PlaybackHistory{}).Error
	}
	m, err := e.repo.Media.FindByID(ctx, mediaID)
	if err != nil || m == nil {
		return errors.New("media not found")
	}
	dur := int64(m.DurationSec) * 1000
	if dur <= 0 {
		dur = 1
	}
	return e.repo.History.Upsert(ctx, &model.PlaybackHistory{
		UserID:     userID,
		MediaID:    mediaID,
		PositionMs: dur,
		DurationMs: dur,
		WatchedAt:  time.Now(),
		Completed:  true,
	})
}

// RecordProgress 记录播放进度（来自 Emby 客户端的 /Sessions/Playing/Progress）。
func (e *EmbyService) RecordProgress(ctx context.Context, userID, mediaID string, positionTicks, runtimeTicks int64) error {
	pos := positionTicks / 10_000
	dur := runtimeTicks / 10_000
	if dur <= 0 {
		// runtimeTicks 缺失时回退到 media.DurationSec
		if m, _ := e.repo.Media.FindByID(ctx, mediaID); m != nil {
			dur = int64(m.DurationSec) * 1000
		}
	}
	completed := dur > 0 && pos >= dur*9/10
	return e.repo.History.Upsert(ctx, &model.PlaybackHistory{
		UserID:     userID,
		MediaID:    mediaID,
		PositionMs: pos,
		DurationMs: dur,
		WatchedAt:  time.Now(),
		Completed:  completed,
	})
}

func splitCSV(s string) []string {
	if strings.TrimSpace(s) == "" {
		return []string{}
	}
	parts := strings.Split(s, ",")
	out := make([]string, 0, len(parts))
	for _, p := range parts {
		p = strings.TrimSpace(p)
		if p != "" {
			out = append(out, p)
		}
	}
	return out
}

func intToStr(v int) string {
	if v == 0 {
		return ""
	}
	return strconv.Itoa(v)
}