package main

import (
	"context"
	"embed"
	"io/fs"
	"net/http"
	"time"
)

//go:embed web/*
var webRootFS embed.FS

type WebUI struct {
	fs     fs.FS
	mux    *http.ServeMux
	server *http.Server
}

func NewWebUI(addr string) (*WebUI, error) {
	sub, err := fs.Sub(webRootFS, "web")
	if err != nil {
		return nil, err
	}

	mux := http.NewServeMux()

	static := http.FileServer(http.FS(sub))

	mux.Handle(
		"/static/",
		static,
	)

	registerRoutes(mux)

	return &WebUI{
		fs:  sub,
		mux: mux,
		server: &http.Server{
			Addr:    addr,
			Handler: mux,
		},
	}, nil
}

func (ui *WebUI) Start() error {
	startSessionCleaner() // session过期自动回收
	ui.mux.HandleFunc("/", ui.rootHandler)
	return ui.server.ListenAndServe()
}

func (ui *WebUI) Stop() error {
	if ui.server == nil {
		return nil
	}

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	if err := ui.server.Shutdown(ctx); err != nil {
		ui.server.Close()
		return err
	}
	return nil
}