using System;

namespace Funique
{
    /// <summary>
    /// Counter <br />
    /// ------------------------------------------------ <br />
    /// 計時器
    /// </summary>
    public sealed class Counter
    {
        // 欄位
        #region Field
        float timer;
        float pass;
        bool called;
        bool loop;
        #endregion


        // 事件 
        #region Event
        /// <summary>
        /// Called when times up <br />
        /// ------------------------------------------------ <br />
        /// 當時間到時 會呼叫
        /// </summary>
        public event Action OnTimeUp;
        #endregion

        /// <summary>
        /// Timer is the end point, second as unit <br />
        /// If loop is on, it will auto reset <br />
        /// ------------------------------------------------ <br />
        /// timer 是計時器的終點, 以秒為單位 <br />
        /// 如果 loop 為真, 計時器會自動重置
        /// </summary>
        /// <param name="timer">Second</param>
        /// <param name="loop">Auto reset</param>
        public Counter(float timer, bool loop = false)
        {
            this.timer = timer;
            this.pass = 0;
            this.called = false;
            this.loop = loop;
        }


        // 功能
        #region Utility
        /// <summary>
        /// Reset the timer <br />
        /// ------------------------------------------------ <br />
        /// 重置計時器
        /// </summary>
        public void Reset()
        {
            pass = 0;
            called = false;
        }
        /// <summary>
        /// Put this method in update function <br />
        /// ------------------------------------------------ <br />
        /// 把這個函式放在更新事件中
        /// </summary>
        /// <param name="delta"></param>
        public void Update(float delta)
        {
            pass += delta;
            if (pass >= timer && !called)
            {
                if (OnTimeUp != null) OnTimeUp.Invoke();
                called = true;

                // Automatically reset
                if (loop) Reset();
            }
        }
        #endregion
    }
}