package spa

import (
	"embed"
	"fmt"
	"net/http"
	"os"
)

type handler struct {
	staticFS  embed.FS
	indexPath string
}

func (h handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	reqPath := r.URL.Path
	f, err := h.staticFS.Open(fmt.Sprintf("ng-client/browser%s", reqPath))
	if f != nil {
		f.Close()
	}

	if os.IsNotExist(err) {
		indexFile, indexErr := h.staticFS.Open(h.indexPath)
		if indexErr != nil {
			http.Error(w, "Index file not found", http.StatusInternalServerError)
			return
		}
		defer indexFile.Close()
		tryToDeliverFile(indexFile, h.indexPath, w, r)
		return
	} else if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	tryToDeliverFile(f, h.indexPath, w, r)
}

func HandleFiles(path string, options HandlerOptions) {
	if options.AdditionalMimeTypeMapping != nil {
		for key, value := range options.AdditionalMimeTypeMapping {
			contentTypeMapping[key] = value
		}
	}
	http.Handle(path, handler{
		staticFS:  options.Files,
		indexPath: options.IndexPath,
	})
}