package main

import (
	_ "embed"
	"fmt"
	"io"
	"io/ioutil"
	"local/args"
	"log"
	"net/http"
	"text/template"
)

//go:embed words.json
var words string

//go:embed index.html
var index string

func main() {
	as := args.NewArgSet()
	as.Append(args.INT, "p", "port to listen on", 8091)
	as.Append(args.BOOL, "debug", "debug mode", false)
	if err := as.Parse(); err != nil {
		panic(err)
	}
	log.Printf("args: %+v", as)
	if err := http.ListenAndServe(fmt.Sprintf(":%d", as.GetInt("p")), server{args: as}); err != nil {
		panic(err)
	}
}

type server struct {
	args *args.ArgSet
}

func (server server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	if err := server.writeIndex(w); err != nil {
		panic(err)
	}
}

func (server server) writeIndex(w io.Writer) error {
	if server.args.GetBool("debug") {
		return server.writeIndexFile(w)
	}
	return server.writeIndexEmbed(w)
}

func (server server) writeIndexEmbed(w io.Writer) error {
	t := template.New("index")
	t, err := t.Parse(index)
	if err != nil {
		return err
	}
	return t.Execute(w, struct{ Words string }{Words: words})
}

func (server server) writeIndexFile(w io.Writer) error {
	b, err := ioutil.ReadFile("words.json")
	if err != nil {
		return err
	}
	t, err := template.ParseFiles("index.html")
	if err != nil {
		return err
	}
	return t.Execute(w, struct{ Words string }{Words: string(b)})
}