package main

import (
	"flag"
	"fmt"
	"os"
	"time"
)

import (
	. "github.com/meatballhat/box-o-sand/conway"
)

var (
	height  = flag.Int("height", 40, "Game height")
	width   = flag.Int("width", 80, "Game width")
	mutate  = flag.Bool("mutate", false, "Mutate every other generation")
	sleepMs = flag.Int("sleep.ms", 200,
		"Millisecond sleep interval per generation")
)

func main() {
	flag.Parse()

	game := NewGameOfLife(*height, *width)
	err := game.ImportRandomState()
	if err != nil {
		fmt.Fprintf(os.Stderr, "WHAT IN FAIL?: %v\n", err)
		os.Exit(2)
	}

	genTicks, err := game.Generations()
	if err != nil {
		fmt.Fprintf(os.Stderr, "No generations?: %v\n", err)
		os.Exit(3)
	}

	sleepInterval := time.Duration(*sleepMs * 1000 * 1000)
	for genTick := range genTicks {
		fmt.Printf("\nGeneration %v\n%v\n", genTick.N, time.Now())
		fmt.Println(game)

		game.EvaluateGeneration()

		if genTick.Error != nil {
			fmt.Fprintf(os.Stderr, "%s: %s\n", genTick.Message, genTick.Error)
			os.Exit(4)
		}

		if len(genTick.Message) > 0 {
			fmt.Println(genTick.Message)
		}

		if *mutate && genTick.N%2 == 0 {
			game.Mutate()
		}

		time.Sleep(sleepInterval)
	}
}