package responses

import (
	"fmt"
	"html/template"
	"net/http"

	"git.kirsle.net/apps/gophertype/pkg/constants"
)

// TemplateFuncs available to all templates.
func TemplateFuncs(r *http.Request) template.FuncMap {
	return template.FuncMap{
		"CSRF":         CSRF(r),
		"FormValue":    FormValue(r),
		"TestFunction": TestFunction(r),
	}
}

// CSRF returns the current CSRF token as an HTML hidden form field.
func CSRF(r *http.Request) func() template.HTML {
	return func() template.HTML {
		token, _ := r.Cookie(constants.CSRFCookieName)
		return template.HTML(fmt.Sprintf(
			`<input type="hidden" name="%s" value="%s">`,
			constants.CSRFFormName,
			token.Value,
		))
	}
}

// FormValue returns a form value (1st item only).
func FormValue(r *http.Request) func(string) string {
	return func(key string) string {
		return r.FormValue(key)
	}
}

// TestFunction is a "hello world" template function.
func TestFunction(r *http.Request) func() template.HTML {
	return func() template.HTML {
		return template.HTML("TestFunction() called")
	}
}