package repositories

import (
	"encoding/json"
	"log"
	"time"

	"github.com/niangaodev/art-code/config"
	"github.com/niangaodev/art-code/models"
	"gorm.io/gorm"
)

// GetWorks 获取所有作品
func GetWorks() ([]models.Work, error) {
	var works []models.Work
	err := config.DB.Model(&models.Work{}).
		Where("deleted_at = ?", 0).
		Order("id DESC").
		Find(&works).Error
	if err != nil {
		log.Printf("Error querying works: %v", err)
		return nil, err
	}
	return works, nil
}

// GetWorkByID 根据ID获取作品
func GetWorkByID(id string) (*models.Work, error) {
	var work models.Work
	err := config.DB.Model(&models.Work{}).
		Where("id = ? AND deleted_at = ?", id, 0).
		First(&work).Error
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil, nil
		}
		log.Printf("Error getting work by ID: %v", err)
		return nil, err
	}
	return &work, nil
}

// GetWorkTechStack 获取作品的技术栈
func GetWorkTechStack(workID string) ([]models.WorkTechStack, error) {
	var techStacks []models.WorkTechStack
	err := config.DB.Model(&models.WorkTechStack{}).
		Where("work_id = ? AND deleted_at = ?", workID, 0).
		Find(&techStacks).Error
	if err != nil {
		log.Printf("Error querying work tech stack: %v", err)
		return nil, err
	}
	return techStacks, nil
}

// GetWorkGallery 获取作品的图库
func GetWorkGallery(workID string) ([]models.WorkGallery, error) {
	var galleries []models.WorkGallery
	err := config.DB.Model(&models.WorkGallery{}).
		Where("work_id = ? AND deleted_at = ?", workID, 0).
		Order("sort_order").
		Find(&galleries).Error
	if err != nil {
		log.Printf("Error querying work gallery: %v", err)
		return nil, err
	}
	return galleries, nil
}

// BuildWorkResponse 构建作品响应，包含关联数据
func BuildWorkResponse(work *models.Work) (*models.WorkResponse, error) {
	// 获取技术栈
	techStacks, err := GetWorkTechStack(work.ID)
	if err != nil {
		return nil, err
	}

	// 按类别分组技术栈
	techStackMap := make(map[string][]string)
	for _, ts := range techStacks {
		techStackMap[ts.Category] = append(techStackMap[ts.Category], ts.Item)
	}

	// 转换为前端期望的格式
	var techStackResponse []map[string]interface{}
	for category, items := range techStackMap {
		techStackResponse = append(techStackResponse, map[string]interface{}{
			"category": category,
			"items":    items,
		})
	}

	// 获取图库
	galleries, err := GetWorkGallery(work.ID)
	if err != nil {
		return nil, err
	}

	// 提取图片URL
	var galleryImages []string
	for _, g := range galleries {
		galleryImages = append(galleryImages, g.ImageURL)
	}

	// 解析links JSON
	var linksData map[string]interface{}
	if work.Links != "" {
		if err := json.Unmarshal([]byte(work.Links), &linksData); err != nil {
			log.Printf("Error parsing links JSON: %v", err)
			linksData = map[string]interface{}{"live": ""}
		}
	} else {
		linksData = map[string]interface{}{"live": ""}
	}

	// 获取下一个作品ID
	nextWorkID, err := GetNextWorkID(work.ID)
	if err != nil {
		log.Printf("Error getting next work ID: %v", err)
		nextWorkID = ""
	}

	// 解析视频播放地址：优先 video_id，否则 hero_video
	videoURL := ""
	if work.VideoID != "" {
		videoURL = ResolveVideoURL(work.VideoID)
	}
	if videoURL == "" {
		videoURL = work.HeroVideo
	}

	return &models.WorkResponse{
		ID:        work.ID,
		Title:     work.Title,
		Category:  work.Category,
		Year:      work.Year,
		HeroImg:   work.HeroImg,
		HeroVideo: work.HeroVideo,
		VideoID:   work.VideoID,
		VideoURL:  videoURL,
		Desc:      work.Description,
		TechStack: techStackResponse,
		Gallery:   galleryImages,
		Links:     linksData,
		Next:      nextWorkID,
	}, nil
}

// GetNextWorkID 获取下一个作品ID（简单实现，实际可能需要更复杂的逻辑）
func GetNextWorkID(currentID string) (string, error) {
	var ids []string
	err := config.DB.Model(&models.Work{}).
		Select("id").
		Where("deleted_at = ?", 0).
		Pluck("id", &ids).Error
	if err != nil {
		return "", err
	}

	// 找到当前ID的索引
	index := -1
	for i, id := range ids {
		if id == currentID {
			index = i
			break
		}
	}

	// 如果没找到或者是最后一个，返回第一个
	if index == -1 || index == len(ids)-1 {
		if len(ids) > 0 {
			return ids[0], nil
		}
		return "", nil
	}

	// 返回下一个
	return ids[index+1], nil
}

// CreateWorkTechStack 创建作品技术栈
func CreateWorkTechStack(workID string, techStack []map[string]interface{}) error {
	// 先删除旧的技术栈（软删除）
	err := config.DB.Model(&models.WorkTechStack{}).
		Where("work_id = ?", workID).
		Update("deleted_at", time.Now().Unix()).Error
	if err != nil {
		log.Printf("Error deleting old tech stack: %v", err)
	}

	// 创建新的技术栈
	for _, categoryData := range techStack {
		category, ok := categoryData["category"].(string)
		if !ok {
			continue
		}
		items, ok := categoryData["items"].([]interface{})
		if !ok {
			continue
		}
		for _, item := range items {
			itemStr, ok := item.(string)
			if !ok || itemStr == "" {
				continue
			}
			techStackItem := models.WorkTechStack{
				WorkID:    workID,
				Category:  category,
				Item:      itemStr,
				CreatedAt: time.Now().Unix(),
				DeletedAt: 0,
			}
			if err := config.DB.Create(&techStackItem).Error; err != nil {
				log.Printf("Error creating tech stack item: %v", err)
				return err
			}
		}
	}
	return nil
}

// CreateWorkGallery 创建作品图库
func CreateWorkGallery(workID string, gallery []string) error {
	// 先删除旧的图库（软删除）
	err := config.DB.Model(&models.WorkGallery{}).
		Where("work_id = ?", workID).
		Update("deleted_at", time.Now().Unix()).Error
	if err != nil {
		log.Printf("Error deleting old gallery: %v", err)
	}

	// 创建新的图库
	for index, imageURL := range gallery {
		if imageURL == "" {
			continue
		}
		galleryItem := models.WorkGallery{
			WorkID:      workID,
			ImageURL:    imageURL,
			SortOrder:   uint(index + 1),
			Description: "",
			CreatedAt:   time.Now().Unix(),
			DeletedAt:   0,
		}
		if err := config.DB.Create(&galleryItem).Error; err != nil {
			log.Printf("Error creating gallery item: %v", err)
			return err
		}
	}
	return nil
}

// CreateWork 创建作品
func CreateWork(work *models.Work) error {
	err := config.DB.Create(work).Error
	if err != nil {
		log.Printf("Error creating work: %v", err)
		return err
	}
	return nil
}

// UpdateWork 更新作品
func UpdateWork(work *models.Work) error {
	updateData := map[string]interface{}{
		"title":       work.Title,
		"category":    work.Category,
		"year":        work.Year,
		"hero_img":    work.HeroImg,
		"hero_video":  work.HeroVideo,
		"video_id":    work.VideoID,
		"description": work.Description,
		"is_featured": work.IsFeatured,
		"updated_at":  time.Now().Unix(),
	}
	if work.Links != "" {
		updateData["links"] = work.Links
	}
	err := config.DB.Model(&models.Work{}).
		Where("id = ? AND deleted_at = ?", work.ID, 0).
		Updates(updateData).Error
	if err != nil {
		log.Printf("Error updating work: %v", err)
		return err
	}
	return nil
}

// DeleteWork 删除作品 (Soft Delete)
func DeleteWork(id string) error {
	err := config.DB.Model(&models.Work{}).
		Where("id = ?", id).
		Update("deleted_at", time.Now().Unix()).Error
	if err != nil {
		log.Printf("Error deleting work: %v", err)
		return err
	}
	return nil
}

// GetAdminWorks 获取后台作品列表 (分页)
func GetAdminWorks(page, pageSize int) ([]models.Work, int, error) {
	offset := (page - 1) * pageSize

	var works []models.Work
	var total int64

	// 获取总数
	err := config.DB.Model(&models.Work{}).
		Where("deleted_at = ?", 0).
		Count(&total).Error
	if err != nil {
		log.Printf("Error getting work count: %v", err)
		return nil, 0, err
	}

	// 获取列表
	err = config.DB.Model(&models.Work{}).
		Where("deleted_at = ?", 0).
		Order("created_at DESC").
		Limit(pageSize).
		Offset(offset).
		Find(&works).Error
	if err != nil {
		log.Printf("Error querying admin works: %v", err)
		return nil, 0, err
	}

	return works, int(total), nil
}

// BuildWorksResponse 构建作品列表响应
func BuildWorksResponse(works []models.Work) []models.WorkResponse {
	var responses []models.WorkResponse
	for _, work := range works {
		// 这里不包含详情，简化处理
		responses = append(responses, models.WorkResponse{
			ID:       work.ID,
			Title:    work.Title,
			Category: work.Category,
			Year:     work.Year,
			HeroImg:  work.HeroImg,
			Desc:     work.Description,
		})
	}
	return responses
}

// GetWorkCount 获取作品总数
func GetWorkCount() (int, error) {
	var count int64
	err := config.DB.Model(&models.Work{}).
		Where("deleted_at = ?", 0).
		Count(&count).Error
	if err != nil {
		log.Printf("Error getting work count: %v", err)
		return 0, err
	}
	return int(count), nil
}