package models

import (
	"time"

	"gorm.io/gorm"
)

// Notification 通知模型
type Notification struct {
	ID        int64          `json:"id" gorm:"type:bigint;primaryKey;autoIncrement;comment:通知ID"`
	UserID    int64          `json:"user_id" gorm:"type:bigint;not null;index;comment:用户ID"`
	Type      string         `json:"type" gorm:"type:varchar(50);not null;index;comment:通知类型"`
	Title     string         `json:"title" gorm:"type:varchar(255);not null;comment:通知标题"`
	Content   string         `json:"content" gorm:"type:text;not null;comment:通知内容"`
	Link      *string        `json:"link" gorm:"type:varchar(500);comment:跳转链接"`
	IsRead    bool           `json:"is_read" gorm:"type:boolean;default:false;index;comment:是否已读"`
	Priority  int            `json:"priority" gorm:"type:tinyint;default:0;comment:优先级:0-普通,1-重要,2-紧急"`
	CreatedAt time.Time      `json:"created_at" gorm:"type:timestamp;default:CURRENT_TIMESTAMP;index;comment:创建时间"`
	ReadAt    *time.Time     `json:"read_at" gorm:"type:timestamp;comment:阅读时间"`
	DeletedAt gorm.DeletedAt `json:"-" gorm:"index;comment:删除时间"`

	// 关联关系
	User User `json:"-"`
}

// TableName 指定表名
func (Notification) TableName() string {
	return "ai_notifications"
}

// NotificationType 通知类型常量
const (
	NotificationTypeSystem      = "system"      // 系统通知
	NotificationTypeLearning    = "learning"    // 学习提醒
	NotificationTypeAchievement = "achievement" // 成就通知
)

// NotificationPriority 通知优先级常量
const (
	NotificationPriorityNormal = 0 // 普通
	NotificationPriorityImportant = 1 // 重要
	NotificationPriorityUrgent = 2 // 紧急
)