package core

import (
	"bufio"
	"context"
	"io"
	"log/slog"
	"os"
	"time"

	"github.com/EngoEngine/ecs"
)

type App struct {
	W *ecs.World
	L *slog.Logger
}

func New(level string, logFile io.Writer) *App {
	var logLevel slog.Level
	switch level {
	case "INFO", "info":
		logLevel = slog.LevelInfo
	case "DEBUG", "debug":
		logLevel = slog.LevelDebug
	case "ERROR", "error":
		logLevel = slog.LevelError
	}

	l := slog.New(slog.NewTextHandler(
		logFile, &slog.HandlerOptions{
			Level: logLevel,
		},
	),
	)

	world := &ecs.World{}

	return &App{
		L: l,
		W: world,
	}

}

func (a *App) Run(ctx context.Context) {
	go func() {
		t := time.NewTicker(time.Millisecond * 30)
		for range t.C {
			a.W.Update(1)
		}
	}()

	scanner := bufio.NewScanner(os.Stdin)
	var line string
	for {
		select {
		case <-ctx.Done():
			a.L.Error("cancelled")
			return
		default:
			if scanner.Scan() {
				line = scanner.Text()
			}
			a.L.Info("scanning input")
			a.L.With(slog.String("input", line)).Info("received command")
		}
	}

}