package game

import (
	"encoding/json"
	"fmt"
	"os"
	"sirlab.de/go/knyt/engine"
	"sirlab.de/go/knyt/user"
	"time"
)

func NewGameFromFile(id, fileName string) (*Game, error) {
	jsonBytes, err := os.ReadFile(fileName)
	if err != nil {
		return nil, err
	}

	var gmJson GameJson
	if err := json.Unmarshal(jsonBytes, &gmJson); err != nil {
		return nil, fmt.Errorf("%s: %v\n", fileName, err)
	} else {
		gm := Game{
			id:              id,
			name:            gmJson.Name,
			eng:             engine.NewEngine(id),
			playerTimestamp: make(map[string]time.Time),
		}

		go gm.eng.Run()

		return &gm, nil
	}
}

func (gm *Game) GetId() string {
	return gm.id
}

func (gm *Game) GetEngine() *engine.Engine {
	return gm.eng
}

func (gm *Game) UpdatePlayerTimestamp(usr *user.User) {
	gm.mu.Lock()
	defer gm.mu.Unlock()

	gm.playerTimestamp[usr.GetId()] = time.Now()
}

func (gm *Game) GetActivePlayers() []string {
	gm.mu.Lock()
	defer gm.mu.Unlock()

	players := make([]string, 0)

	now := time.Now()
	for usrId, timestamp := range gm.playerTimestamp {
		elapsed := now.Sub(timestamp)

		fmt.Printf("%s: %.0f\n", usrId, elapsed.Seconds())

		if elapsed.Seconds() < 30.0 {
			players = append(players, usrId)
		}
	}

	return players
}