package main

import (
	"math/rand"
	"syscall/js"
	"time"

	"muhq.space/muhqs-game/go/game"
)

var r *rand.Rand

func jSRandomTileFromMap() js.Func {
	jsonFunc := js.FuncOf(func(this js.Value, args []js.Value) any {
		if len(args) != 2 {
			return "Invalid number of arguments passed"
		}

		mapData := args[0].String()

		symbols := make([]string, 0, args[1].Length())
		for i := 0; i < args[1].Length(); i++ {
			symbol := args[1].Index(i).String()
			symbols = append(symbols, symbol)
		}

		position, err := randomTileFromMap(mapData, symbols)
		if err != nil {
			return err.Error()
		}
		return map[string]any{"y": position.Y + 1, "x": position.X + 1}
	})
	return jsonFunc
}

func randomTileFromMap(mapData string, symbols []string) (game.Position, error) {
	m, err := game.ParseMap([]byte(mapData))
	if err != nil {
		return game.INVALID_POSITION(), err
	}
	return m.RandomTileFromSymbols(r, symbols)
}

func main() {
	r = rand.New(rand.NewSource(time.Now().UnixNano()))
	js.Global().Set("randomTileFromSymbol", jSRandomTileFromMap())
	<-make(chan bool)
}