package entity

import (
	"time"

	"gorm.io/gorm"
)

// Category 分类实体
type Category struct {
	ID          uint           `json:"id" gorm:"primarykey"`
	Name        string         `json:"name" gorm:"not null;size:100"`
	Slug        string         `json:"slug" gorm:"uniqueIndex;not null;size:100"`
	Description string         `json:"description" gorm:"type:text"`
	ParentID    *uint          `json:"parent_id" gorm:"index"`
	Color       string         `json:"color" gorm:"default:#3b82f6;size:7"`
	CoverImage  string         `json:"cover_image" gorm:"size:500"`
	Sort        int            `json:"sort" gorm:"default:0;index"`
	SortOrder   int            `json:"sort_order" gorm:"default:0;index"`
	IsActive    bool           `json:"is_active" gorm:"default:true;index"`
	CreatedAt   time.Time      `json:"created_at"`
	UpdatedAt   time.Time      `json:"updated_at"`
	DeletedAt   gorm.DeletedAt `json:"deleted_at" gorm:"index"`

	// 关联
	Parent     *Category  `json:"parent,omitempty" gorm:"foreignKey:ParentID"`
	Children   []Category `json:"children,omitempty" gorm:"foreignKey:ParentID"`
	Photos     []Photo    `json:"photos,omitempty" gorm:"foreignKey:CategoryID"`
	Albums     []Album    `json:"albums,omitempty" gorm:"foreignKey:CategoryID"`
	PhotoCount int64      `json:"photo_count" gorm:"-"` // 照片数量，不存储在数据库中
}

// CategoryTree 分类树结构（用于前端显示）
type CategoryTree struct {
	ID          uint            `json:"id"`
	Name        string          `json:"name"`
	Slug        string          `json:"slug"`
	Description string          `json:"description"`
	ParentID    *uint           `json:"parent_id"`
	Color       string          `json:"color"`
	CoverImage  string          `json:"cover_image"`
	Sort        int             `json:"sort"`
	SortOrder   int             `json:"sort_order"`
	IsActive    bool            `json:"is_active"`
	PhotoCount  int64           `json:"photo_count"`
	Children    []CategoryTree  `json:"children"`
	CreatedAt   time.Time       `json:"created_at"`
	UpdatedAt   time.Time       `json:"updated_at"`
}

// CategoryStats 分类统计信息
type CategoryStats struct {
	Total           int64            `json:"total"`            // 总分类数
	Active          int64            `json:"active"`           // 活跃分类数
	TopLevel        int64            `json:"top_level"`        // 顶级分类数
	TotalCategories int64            `json:"total_categories"` // 总分类数（别名）
	MaxLevel        int64            `json:"max_level"`        // 最大层级
	FeaturedCount   int64            `json:"featured_count"`   // 特色分类数
	PhotoCounts     map[string]int64 `json:"photo_counts"`     // 各分类照片数量
}

// CategoryListParams 分类列表查询参数
type CategoryListParams struct {
	Page         int    `json:"page" form:"page"`
	Limit        int    `json:"limit" form:"limit"`
	Search       string `json:"search" form:"search"`
	ParentID     *uint  `json:"parent_id" form:"parent_id"`
	IsActive     *bool  `json:"is_active" form:"is_active"`
	IncludeStats bool   `json:"include_stats" form:"include_stats"`
	SortBy       string `json:"sort_by" form:"sort_by"`
	Order        string `json:"order" form:"order"`
}

// CreateCategoryRequest 创建分类请求
type CreateCategoryRequest struct {
	Name        string `json:"name" binding:"required,max=100"`
	Slug        string `json:"slug" binding:"required,max=100"`
	Description string `json:"description" binding:"max=500"`
	ParentID    *uint  `json:"parent_id"`
	Color       string `json:"color" binding:"max=7"`
	CoverImage  string `json:"cover_image" binding:"max=500"`
	Sort        int    `json:"sort"`
}

// UpdateCategoryRequest 更新分类请求
type UpdateCategoryRequest struct {
	Name        *string `json:"name" binding:"omitempty,max=100"`
	Slug        *string `json:"slug" binding:"omitempty,max=100"`
	Description *string `json:"description" binding:"max=500"`
	ParentID    *uint   `json:"parent_id"`
	Color       *string `json:"color" binding:"omitempty,max=7"`
	CoverImage  *string `json:"cover_image" binding:"omitempty,max=500"`
	SortOrder   *int    `json:"sort_order"`
	IsActive    *bool   `json:"is_active"`
}

// ReorderCategoriesRequest 重新排序分类请求
type ReorderCategoriesRequest struct {
	ParentID    *uint  `json:"parent_id"`
	CategoryIDs []uint `json:"category_ids" binding:"required,min=1"`
}

// GenerateSlugRequest 生成slug请求
type GenerateSlugRequest struct {
	Name string `json:"name" binding:"required,max=100"`
}

// GenerateSlugResponse 生成slug响应
type GenerateSlugResponse struct {
	Slug string `json:"slug"`
}

// SuccessResponse 成功响应
type SuccessResponse struct {
	Message string `json:"message"`
}

// TableName 指定表名
func (Category) TableName() string {
	return "categories"
}

// IsTopLevel 检查是否为顶级分类
func (c *Category) IsTopLevel() bool {
	return c.ParentID == nil
}

// HasChildren 检查是否有子分类
func (c *Category) HasChildren() bool {
	return len(c.Children) > 0
}