package webapp

import (
	"net/http"
	"time"
)

// basePageData is the struct every page template receives (embedded
// into the per-page struct). The shared layout looks up Title,
// IsLogin, CSRFToken, Version, BuildDate, and StartedAt from here so
// handlers do not need to repeat those fields on every page.
type basePageData struct {
	Title     string
	IsLogin   bool
	CSRFToken string
	Version   string
	BuildDate string
	StartedAt time.Time
}

// newBasePage builds the common fields. isLogin is true for the
// login page so the layout can hide the navigation; csrfToken is the
// empty string when isLogin is true (there is no session yet).
func (s *Server) newBasePage(_ *http.Request, title string, sess *Session) basePageData {
	return basePageData{
		Title:     title,
		IsLogin:   sess == nil,
		CSRFToken: tokenOrEmpty(sess),
		Version:   s.deps.Version,
		BuildDate: s.deps.BuildDate,
		StartedAt: s.deps.StartedAt,
	}
}

func tokenOrEmpty(sess *Session) string {
	if sess == nil {
		return ""
	}
	return sess.CSRFToken
}