package main

import (
	"encoding/json"
	"flag"
	"fmt"
	"os"

	"git.sunturtle.xyz/zephyr/horse/umadump/replay"
)

func main() {
	var out string
	flag.StringVar(&out, "o", "", "output `file`")
	flag.Parse()

	r := os.Stdin
	if flag.NArg() > 0 {
		f, err := os.Open(flag.Arg(0))
		if err != nil {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(2)
		}
		r = f
		defer f.Close()
	}

	w := os.Stdout
	if out != "" {
		f, err := os.Create(out)
		if err != nil {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(2)
		}
		w = f
		defer f.Close()
	}

	var race replay.Race
	d := json.NewDecoder(r)
	d.DisallowUnknownFields()
	if err := d.Decode(&race); err != nil {
		fmt.Fprintln(os.Stderr, "replay:", err)
		os.Exit(1)
	}
	simdata, err := replay.DecodeSim(race.SimDataBase64)
	if err != nil {
		fmt.Fprintln(os.Stderr, "simdata:", err)
	}

	b, err := json.Marshal(simdata)
	if err != nil {
		panic(err)
	}
	_, err = w.Write(b)
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
	}
}