package main

import (
	"html/template"
	"net/http"
	"net/url"
)

var templateWatchFiles = []string{ "templates/base.html", "templates/watch.html" }
var templateWatch = template.Must(template.ParseFiles(templateWatchFiles...))

/* render template */
type WatchTemplateData struct {
	Src string
}

func renderWatchTemplate(w http.ResponseWriter, id string, rawQuery string) {
	if debug {
		reloadTemplate(&templateWatch, templateWatchFiles...)
	}

	// construct url query from existing rawQuery
	q, parseErr := url.ParseQuery(rawQuery)
	if parseErr != nil {
		templateError(parseErr, w)
		return
	}
	q.Add("enablejsapi", "1")
	q.Add("autoplay", "1")
	q.Del("v")
	if q.Has("t") {
		q.Add("start", q.Get("t")) // translate 't' to 'start' (embed equivalent)
		q.Del("t")
	}

	// construct url
	u, urlErr := url.Parse("https://www.youtube-nocookie.com/embed/" + id)
	if urlErr != nil {
		templateError(urlErr, w)
		return
	}
	u.RawQuery = q.Encode()

	// execute template
	err := templateWatch.Execute(w, WatchTemplateData{
		Src: u.String(),
	})
	if err != nil {
		templateError(err, w)
	}
}

/* routes */
func registerRoutesWatch(mux *http.ServeMux) {
	mux.HandleFunc("/watch", func(w http.ResponseWriter, r *http.Request) {
		id := r.URL.Query().Get("v")
		renderWatchTemplate(w, id, r.URL.RawQuery)
	})
}