package handler

import (
	_ "embed"
	"net/http"
)

//go:embed static/index.html
var indexPage string

type Params struct {
	MatrixHostname string
	MatrixBaseURL  string
	RootPath       string
}

type handler struct {
	*http.ServeMux
	params Params
}

func New(params Params) http.Handler {
	h := &handler{
		ServeMux: http.NewServeMux(),
		params:   params,
	}

	h.Handle("GET /.well-known/matrix/server", http.HandlerFunc(h.getMatrixServer))
	h.Handle("GET /.well-known/matrix/client", http.HandlerFunc(h.getMatrixClient))
	h.Handle("GET /{$}", http.HandlerFunc(h.getHomepage))
	h.Handle("GET /", http.FileServer(http.Dir(params.RootPath)))

	return h
}

func (h *handler) getMatrixServer(w http.ResponseWriter, r *http.Request) {
	w.Header().Add("content-type", "application/json")
	w.WriteHeader(http.StatusOK)
	w.Write([]byte(`{"m.server": "` + h.params.MatrixHostname + `"}`))
}

func (h *handler) getMatrixClient(w http.ResponseWriter, r *http.Request) {
	w.Header().Add("content-type", "application/json")
	w.WriteHeader(http.StatusOK)
	w.Write([]byte(`{"m.homeserver": {"base_url": "` + h.params.MatrixBaseURL + `"}}`))
}

func (h *handler) getHomepage(w http.ResponseWriter, r *http.Request) {
	w.Header().Add("content-type", "text/html")
	w.WriteHeader(http.StatusOK)
	if r.Method == http.MethodGet {
		w.Write([]byte(indexPage))
	}
}