package entities

import (
	"time"

	"github.com/google/uuid"
	"github.com/shopspring/decimal"
	"gorm.io/gorm"
)

// Product 产品实体
type Product struct {
	ID          string          `gorm:"primaryKey;type:varchar(36)" comment:"产品ID"`
	OldID       *string         `gorm:"type:varchar(36);index" comment:"旧产品ID，用于兼容"`
	Name        string          `gorm:"type:varchar(100);not null" comment:"产品名称"`
	Code        string          `gorm:"type:varchar(50);uniqueIndex;not null" comment:"产品编号"`
	Description string          `gorm:"type:text" comment:"产品简介"`
	Content     string          `gorm:"type:text" comment:"产品内容"`
	CategoryID  string          `gorm:"type:varchar(36);not null" comment:"产品分类ID"`
	Price       decimal.Decimal `gorm:"type:decimal(10,2);not null;default:0" comment:"产品价格"`
	IsEnabled   bool            `gorm:"default:true" comment:"是否启用"`
	IsVisible   bool            `gorm:"default:true" comment:"是否展示"`
	IsPackage   bool            `gorm:"default:false" comment:"是否组合包"`
	// 组合包相关关联
	PackageItems []*ProductPackageItem `gorm:"foreignKey:PackageID" comment:"组合包项目列表"`
	// SEO信息
	SEOTitle       string `gorm:"type:varchar(200)" comment:"SEO标题"`
	SEODescription string `gorm:"type:text" comment:"SEO描述"`
	SEOKeywords    string `gorm:"type:text" comment:"SEO关键词"`

	// 关联关系
	Category      *ProductCategory      `gorm:"foreignKey:CategoryID" comment:"产品分类"`
	Documentation *ProductDocumentation `gorm:"foreignKey:ProductID" comment:"产品文档"`

	CreatedAt time.Time      `gorm:"autoCreateTime" comment:"创建时间"`
	UpdatedAt time.Time      `gorm:"autoUpdateTime" comment:"更新时间"`
	DeletedAt gorm.DeletedAt `gorm:"index" comment:"软删除时间"`
}

// BeforeCreate GORM钩子：创建前自动生成UUID
func (p *Product) BeforeCreate(tx *gorm.DB) error {
	if p.ID == "" {
		p.ID = uuid.New().String()
	}
	return nil
}

// IsValid 检查产品是否有效
func (p *Product) IsValid() bool {
	return p.DeletedAt.Time.IsZero() && p.IsEnabled
}

// IsVisibleToUser 检查产品是否对用户可见
func (p *Product) IsVisibleToUser() bool {
	return p.IsValid() && p.IsVisible
}

// CanBeSubscribed 检查产品是否可以订阅
func (p *Product) CanBeSubscribed() bool {
	return p.IsValid()
}


// UpdateSEO 更新SEO信息
func (p *Product) UpdateSEO(title, description, keywords string) {
	p.SEOTitle = title
	p.SEODescription = description
	p.SEOKeywords = keywords
}

// Enable 启用产品
func (p *Product) Enable() {
	p.IsEnabled = true
}

// Disable 禁用产品
func (p *Product) Disable() {
	p.IsEnabled = false
}

// Show 显示产品
func (p *Product) Show() {
	p.IsVisible = true
}

// Hide 隐藏产品
func (p *Product) Hide() {
	p.IsVisible = false
}

// SetAsPackage 设置为组合包
func (p *Product) SetAsPackage() {
	p.IsPackage = true
}

func (p *Product) IsCombo() bool {
	return p.IsPackage
}

// SetOldID 设置旧ID
func (p *Product) SetOldID(oldID string) {
	p.OldID = &oldID
}

// GetOldID 获取旧ID
func (p *Product) GetOldID() string {
	if p.OldID != nil {
		return *p.OldID
	}
	return ""
}

// HasOldID 检查是否有旧ID
func (p *Product) HasOldID() bool {
	return p.OldID != nil && *p.OldID != ""
}