package models

import "time"

// SiteSetting holds the singleton (id=1) global display configuration:
// logo, top-left title, header banner text, and footer text, each with
// zh/en variants that fall back to i18n defaults when empty.
type SiteSetting struct {
	ID               uint      `gorm:"primarykey" json:"id"`
	Logo             string    `gorm:"size:512" json:"logo"`            // local filename (served under /uploads/logos) OR a full URL
	Favicon          string    `gorm:"size:512" json:"favicon"`         // local filename (served under /uploads/logos) OR a full URL
	LogoTextZh       string    `gorm:"size:255" json:"logo_text_zh"`    // top-left title (zh)
	LogoTextEn       string    `gorm:"size:255" json:"logo_text_en"`    // top-left title (en)
	HeaderTextZh     string    `gorm:"size:512" json:"header_text_zh"`   // header banner text (zh)
	HeaderTextEn     string    `gorm:"size:512" json:"header_text_en"`   // header banner text (en)
	HomeWelcomeZh    string    `gorm:"size:255" json:"home_welcome_zh"`  // home page welcome heading (zh)
	HomeWelcomeEn    string    `gorm:"size:255" json:"home_welcome_en"`  // home page welcome heading (en)
	HomeSubtitleZh   string    `gorm:"size:512" json:"home_subtitle_zh"` // home page subtitle (zh)
	HomeSubtitleEn   string    `gorm:"size:512" json:"home_subtitle_en"` // home page subtitle (en)
	FooterTextZh     string    `gorm:"size:512" json:"footer_text_zh"`   // footer text (zh)
	FooterTextEn     string    `gorm:"size:512" json:"footer_text_en"`   // footer text (en)
	AllowRegistration bool      `gorm:"default:false" json:"allow_registration"` // whether users can self-register
	UpdatedBy        uint      `gorm:"index" json:"updated_by"`
	UpdatedAt        time.Time `json:"updated_at"`
}

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

// LogoIsURL reports whether the logo value is an external URL rather than a
// local filename.
func (s *SiteSetting) LogoIsURL() bool {
	if s == nil || s.Logo == "" {
		return false
	}
	return len(s.Logo) >= 4 && (s.Logo[:4] == "http")
}

// FaviconIsURL reports whether the favicon value is an external URL rather than a
// local filename.
func (s *SiteSetting) FaviconIsURL() bool {
	if s == nil || s.Favicon == "" {
		return false
	}
	return len(s.Favicon) >= 4 && (s.Favicon[:4] == "http")
}

// LogoText returns the title for the given language code, falling back to the
// other language when the requested one is empty.
func (s *SiteSetting) LogoText(lang string) string {
	if lang == "zh" {
		if s.LogoTextZh != "" {
			return s.LogoTextZh
		}
		return s.LogoTextEn
	}
	if s.LogoTextEn != "" {
		return s.LogoTextEn
	}
	return s.LogoTextZh
}

// HeaderText returns the header banner text for the given language code,
// falling back to the other language when the requested one is empty.
func (s *SiteSetting) HeaderText(lang string) string {
	if lang == "zh" {
		if s.HeaderTextZh != "" {
			return s.HeaderTextZh
		}
		return s.HeaderTextEn
	}
	if s.HeaderTextEn != "" {
		return s.HeaderTextEn
	}
	return s.HeaderTextZh
}

// HomeWelcome returns the home page welcome heading for the given language,
// falling back to the other language when the requested one is empty.
func (s *SiteSetting) HomeWelcome(lang string) string {
	if lang == "zh" {
		if s.HomeWelcomeZh != "" {
			return s.HomeWelcomeZh
		}
		return s.HomeWelcomeEn
	}
	if s.HomeWelcomeEn != "" {
		return s.HomeWelcomeEn
	}
	return s.HomeWelcomeZh
}

// HomeSubtitle returns the home page subtitle for the given language,
// falling back to the other language when the requested one is empty.
func (s *SiteSetting) HomeSubtitle(lang string) string {
	if lang == "zh" {
		if s.HomeSubtitleZh != "" {
			return s.HomeSubtitleZh
		}
		return s.HomeSubtitleEn
	}
	if s.HomeSubtitleEn != "" {
		return s.HomeSubtitleEn
	}
	return s.HomeSubtitleZh
}

// FooterText returns the footer text for the given language code, falling
// back to the other language when the requested one is empty.
func (s *SiteSetting) FooterText(lang string) string {
	if lang == "zh" {
		if s.FooterTextZh != "" {
			return s.FooterTextZh
		}
		return s.FooterTextEn
	}
	if s.FooterTextEn != "" {
		return s.FooterTextEn
	}
	return s.FooterTextZh
}