package models

import (
	"time"
)

// NotificationType represents the type of notification
type NotificationType string

const (
	NotificationTypeSystem          NotificationType = "system"
	NotificationTypeAlert           NotificationType = "alert"
	NotificationTypeInfo            NotificationType = "info"
	NotificationTypeBudgetAlert     NotificationType = "budget_alert"     // 预算超支提醒
	NotificationTypeRecurring       NotificationType = "recurring"        // 周期交易提醒
	NotificationTypePaymentReminder NotificationType = "payment_reminder" // 还款提醒
	NotificationTypeSavingsGoal     NotificationType = "savings_goal"     // 储蓄目标提醒
)

// Notification represents a system notification for a user
type Notification struct {
	BaseModel
	UserID    uint             `gorm:"not null;index" json:"user_id"`
	Title     string           `gorm:"size:200;not null" json:"title"`
	Content   string           `gorm:"type:text;not null" json:"content"`
	Type      NotificationType `gorm:"size:30;not null;default:'system';index" json:"type"`
	IsRead    bool             `gorm:"default:false;index" json:"is_read"`
	Link      string           `gorm:"size:255" json:"link,omitempty"` // Optional link to redirect
	ReadAt    *time.Time       `json:"read_at,omitempty"`
	RelatedID *uint            `gorm:"index" json:"related_id,omitempty"` // 关联实体 ID (如预算、周期交易等)

	// Relationships
	User User `gorm:"foreignKey:UserID" json:"-"`
}

// TableName specifies the table name for Notification
func (Notification) TableName() string {
	return "notifications"
}