using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using System;

/// <summary>
/// 带有+-按钮控制数量显示和回调
/// </summary>
public class CountControler : MonoBehaviour
{
    [SerializeField] Text countText;
    [SerializeField] LongPressButton addBtn;
    [SerializeField] LongPressButton decBtn;

    int count;  //当前数量
    int maxCount;   //最大数量
    string format;

    Action<int> OnChangeEvent;
    Func<int, bool> CanAddEvent;
    Func<int, bool> CanDecEvent;
    void Start()
    {
        addBtn.AddListener(() =>
        {
            if (CanAddEvent == null || !CanAddEvent(count))
            {
                return;
            }
            count++;
            Refresh();
        });
        addBtn.onPress.AddListener(() =>
        {
            if (CanAddEvent == null || !CanAddEvent(count))
            {
                return;
            }
            count++;
            Refresh();
        });
        decBtn.AddListener(() =>
        {
            if (CanDecEvent == null || !CanDecEvent(count))
            {
                return;
            }
            count--;
            Refresh();
        });
        decBtn.onPress.AddListener(() =>
        {
            if (CanDecEvent == null || !CanDecEvent(count))
            {
                return;
            }
            count--;
            Refresh();
        });

    }

    public void Init(Action<int> _OnChangeEvent, int _maxCount, int _count = 1,
    Func<int, bool> _CanAddEvent = null, Func<int, bool> _CanDecEvent = null, string _format="{0}/{1}")
    {
        count = _count;
        maxCount = _maxCount;
        OnChangeEvent = _OnChangeEvent;
        CanAddEvent = _CanAddEvent;
        CanDecEvent = _CanDecEvent;
        format = _format;

        Refresh();

    }

    void Refresh()
    {
        
        if (count >= maxCount)
        {
            count = maxCount;
            addBtn.interactable = false;
            addBtn.SetColorful(null, false);
        }
        else
        {
            addBtn.interactable = true;
            addBtn.SetColorful(null, true);
        }

        if (count <= 0)
        {
            count = 0;
            decBtn.interactable = false;
            decBtn.SetColorful(null, false);
        }
        else
        {
            decBtn.interactable = true;
            decBtn.SetColorful(null, true);
        }

        countText.text = string.Format(format, count, maxCount);
        OnChangeEvent?.Invoke(count);
    }

}