package models

import "time"

// NavLink represents a custom navigation link in the header.
type NavLink struct {
	ID        uint      `gorm:"primarykey" json:"id"`
	TitleZh   string    `gorm:"size:100;not null" json:"title_zh"`      // Link text (Chinese)
	TitleEn   string    `gorm:"size:100;not null" json:"title_en"`      // Link text (English)
	URL       string    `gorm:"size:512;not null" json:"url"`           // Target URL
	OpenNew   bool      `gorm:"default:false" json:"open_new"`          // Open in new window
	Enabled   bool      `gorm:"default:true" json:"enabled"`            // Show/hide link
	Sort      int       `gorm:"default:0;index" json:"sort"`            // Display order (lower = first)
	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`
	UpdatedBy uint      `gorm:"index" json:"updated_by"`
}

// TableName overrides the default GORM table name.
func (NavLink) TableName() string {
	return "nav_links"
}

// Title returns the link text for the given language code, falling back to
// the other language when the requested one is empty.
func (n *NavLink) Title(lang string) string {
	if lang == "zh" {
		if n.TitleZh != "" {
			return n.TitleZh
		}
		return n.TitleEn
	}
	if n.TitleEn != "" {
		return n.TitleEn
	}
	return n.TitleZh
}