package feedback

import (
	"bytes"
	"crypto/sha256"
	_ "embed"
	"encoding/hex"
	"net/http"
	"time"
)

// EmbedJSPath is where the widget script is served: the path the WinterCMS
// plugin's file had under the web root, which embedding pages and the
// application's frontend proxy request.
const EmbedJSPath = "/plugins/golem15/feedback/assets/js/embed.js"

// embedJS is the WinterCMS plugin's assets/js/embed.js, byte for byte.
//
//go:embed assets/js/embed.js
var embedJS []byte

var embedJSETag = func() string {
	sum := sha256.Sum256(embedJS)
	return `"` + hex.EncodeToString(sum[:16]) + `"`
}()

// EmbedJS serves the widget script with a JavaScript content type and an
// ETag, answering conditional and range requests like a static file.
func EmbedJS() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/javascript; charset=utf-8")
		w.Header().Set("ETag", embedJSETag)
		http.ServeContent(w, r, "embed.js", time.Time{}, bytes.NewReader(embedJS))
	}
}