package system

import (
	"time"

	"joylink.club/ecs"
	"joylink.club/ecs/filter"
)

var SystemTimerComponent = ecs.NewComponentType[SystemTimer]()

var timerQuery *ecs.Query = ecs.NewQuery(filter.Contains(SystemTimerComponent))

// TimerSystem 系统时钟操作
type TimerSystem struct {
}

func NewTimerSystem() *TimerSystem {
	return &TimerSystem{}
}

// Update world 执行
func (me *TimerSystem) Update(w ecs.World) {
	if e, ok := timerQuery.First(w); ok {
		timer := SystemTimerComponent.Get(e)
		timer.Tick(w.Tick())
	}
}

// ResetWorldTimer 重置world时间
func ResetWorldTimer(w ecs.World, time time.Time) {
	if e, ok := timerQuery.First(w); ok {
		timer := SystemTimerComponent.Get(e)
		timer.ResetTime(time)
	}
}

// GetWorldNow 获取world当前时间
func GetWorldNow(w ecs.World) *time.Time {
	if e, ok := timerQuery.First(w); ok {
		timer := SystemTimerComponent.Get(e)
		now := timer.Now()
		return &now
	}
	return nil
}

/////////////////////////////////////////////////////////////////

// SystemTimer 系统时钟，单例
type SystemTimer struct {
	timer *time.Time
}

// NewSystemTimer 以指定时间构建
func NewSystemTimer(time *time.Time) *SystemTimer {
	return &SystemTimer{
		timer: time,
	}
}

// ResetTime 重置时间
func (me *SystemTimer) ResetTime(time time.Time) {
	*me.timer = time
}

// Now 获取当前时间的副本
func (me *SystemTimer) Now() time.Time {
	return *me.timer
}

// Tick tick系统时钟,单位ms
func (me *SystemTimer) Tick(tick int) {
	*me.timer = me.timer.Add(time.Duration(tick) * time.Millisecond)
}