package navigation

import "github.com/vugu/vugu"

// PageInfo represents the path of a route.
// This is used by navigation components.
type PageInfo struct {
	Path string // URL path.

	Title      string // Title that can be defined by the page component.
	LongTitle  string
	ShortTitle string

	MetaDescription string // Meta description tag that can be defined by the page component.
}

func NewPageInfo(path string, component vugu.Builder) PageInfo {
	var title, longTitle, shortTitle string
	if c, ok := component.(PageTitleGetter); ok {
		title, longTitle, shortTitle = c.PageTitle()
	}

	var metaDescription string
	if c, ok := component.(PageMetaGetter); ok {
		metaDescription = c.PageMetaDescription()
	}

	return PageInfo{
		Path:            path,
		Title:           title,
		LongTitle:       longTitle,
		ShortTitle:      shortTitle,
		MetaDescription: metaDescription,
	}
}

type PageInfoRef struct {
	*PageInfo
}

func (p *PageInfoRef) PageInfoSet(pageInfo *PageInfo) {
	p.PageInfo = pageInfo
}

type PageInfoSetter interface {
	PageInfoSet(*PageInfo)
}

var _ PageInfoSetter = &PageInfoRef{}

// Can be implemented by page components to define their page title.
type PageTitleGetter interface {
	PageTitle() (title, longTitle, shortTitle string)
}

// Can be implemented by page components to define their meta description.
type PageMetaGetter interface {
	PageMetaDescription() (metaDescription string)
}