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

public class GameMenuView : MonoBehaviour
{
    public Button[] funcItemButtons;
    private int funcItemButtonIndex = -1;
    void UpdateFuncItemButtonIndex(int deltaValue) {
        if (funcItemButtonIndex == -1)
        {
            funcItemButtonIndex = 0;
            return;
        }
        funcItemButtonIndex += deltaValue;
        while (funcItemButtonIndex < 0) funcItemButtonIndex += funcItemButtons.Length;
        funcItemButtonIndex %= funcItemButtons.Length;
    }

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.UpArrow))
	    {
            UpdateFuncItemButtonIndex(-1);
            SetSelectable(funcItemButtons[funcItemButtonIndex]);
            AudioMgr.ins.PlayBtn();
	    }
        if (Input.GetKeyDown(KeyCode.DownArrow))
	    {
	        UpdateFuncItemButtonIndex(1);
            SetSelectable(funcItemButtons[funcItemButtonIndex]);
            AudioMgr.ins.PlayBtn();
	    }
        if (Input.GetKeyDown(KeyCode.JoystickButton0) || Input.GetKeyDown(KeyCode.Return))
	    {
            if (funcItemButtonIndex == -1) DuckHunter.TextSmartBowTip.Show("尚未选择按钮");
            else OnClikc_Confirm();
	    }
        if (Input.GetKeyDown(KeyCode.Escape))
	    {
            funcItemButtonIndex = -1;
            SetSelectable(null);
            AudioMgr.ins.PlayBtn();
	    }
    }

    #region 选项功能
    Selectable _targetSelectable;
    Vector3 _targetlocalScale;
    Color _targetColor;
    Selectable.Transition _btnTransition;

    void SetSelectable(Selectable selectable) {
        if (selectable == _targetSelectable) return;

        ResumeTarget();

        if (!selectable) {
            _targetSelectable = null;
            return;
        }

        Button btn = selectable.GetComponent<Button>();
        if (!btn) return;
        if (!btn.interactable) return;

        _targetSelectable = selectable;

        RectTransform rtf = _targetSelectable.transform as RectTransform;
        _btnTransition = btn.transition;
        if (btn.transition == Selectable.Transition.ColorTint) { //变色和放大
            _targetlocalScale = rtf.localScale;
            rtf.localScale = rtf.localScale * 1.2f;
            _targetColor = _targetSelectable.targetGraphic.color;
            var newcolor = _targetSelectable.targetGraphic.color;
            newcolor.a = 0.4f;
            _targetSelectable.targetGraphic.color = newcolor;
        }
    }
    void ResumeTarget()
    {
        if (_targetSelectable) {
            if (_btnTransition == Selectable.Transition.ColorTint) {
                _targetSelectable.transform.localScale = _targetlocalScale;
                _targetSelectable.targetGraphic.color = _targetColor;
            }
        }
    }
    void OnClikc_Confirm()
    {
        try
        {
            if (_targetSelectable && _targetSelectable.interactable) {
                Button btn = _targetSelectable.GetComponent<Button>();
                btn.onClick.Invoke();
            }
        }
        catch (System.Exception e)
        {
            Debug.LogError(e.Message);
            Debug.LogError(e.StackTrace);
        }
    }
    #endregion
}