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

public class KeyCombination : MonoBehaviour
{

    //方向键上的贴图
    public Texture imageUp;
    //方向键下的贴图
    public Texture imageDown;
    //方向键左的贴图
    public Texture imageLeft;
    //方向键右的贴图
    public Texture imageRight;
    //按键成功的贴图
    public Texture imageSuccess;

    //自定义方向键的储存值
    public const int KEY_UP = 0;
    public const int KEY_DOWN = 1;
    public const int KEY_LEFT = 2;
    public const int KEY_RIGHT = 3;
    public const int KEY_FIRT = 4;
    //连续按键的事件限制
    public const int FRAME_COUNT = 100;
    //仓库中储存技能的数量
    public const int SAMPLE_SIZE = 3;
    //每组技能的按键数量
    public const int SAMPLE_COUNT = 5;
    //技能仓库
    int[,] Sample = 
    {
        //下 + 前 + 下 + 前 + 拳
        {KEY_DOWN,KEY_RIGHT,KEY_DOWN,KEY_RIGHT,KEY_FIRT},
        //下 + 前 + 下 + 后 + 拳
        {KEY_DOWN,KEY_RIGHT,KEY_DOWN,KEY_LEFT,KEY_FIRT},
        //下 + 后 + 下 + 后 + 拳
        {KEY_DOWN,KEY_LEFT,KEY_DOWN,KEY_LEFT,KEY_FIRT},
    };
    //记录当前按下按键的键值
    int currentkeyCode = 0;
    //标志是否开启监听按键
    bool startFrame = false;
    //记录当前开启监听到现在的时间
    int currentFrame = 0;
    //保存一段时间内玩家输入的按键组合
    List playerSample;
    //标志完成操作
    bool isSuccess = false;
    void Start()
    {
        //初始话按键组合链表
        playerSample = new List();
    }
    void OnGUI()
    {
        //获得按键组合链表中储存按键的数量
        int size = playerSample.Count;
        //遍历该按键组合链表
        for (int i = 0; i < size; i++)
        {
            //将按下按键对应的图片显示在屏幕中
            int key = playerSample[i];
            Texture temp = null;
            switch (key)
            {
                case KEY_UP:
                    temp = imageUp;
                    break;
                case KEY_DOWN:
                    temp = imageDown;
                    break;
                case KEY_LEFT:
                    temp = imageLeft;
                    break;
                case KEY_RIGHT:
                    temp = imageRight;
                    break;
            }
            if (temp != null)
            {
                GUILayout.Label(temp);
            }
        }
        if (isSuccess)
        {
            //显示成功贴图
            GUILayout.Label(imageSuccess);
        }
        //默认提示信息
        GUILayout.Label("连续组合按键1：下、前、下、前、拳");
        GUILayout.Label("连续组合按键2：下、前、下、后、拳");
        GUILayout.Label("连续组合按键2：下、后、下、后、拳");
    }

    void Update()
    {
        //更新按键
        UpdateKey();
        if (Input.anyKeyDown)
        {
            if (isSuccess)
            {
                //按键成功后重置
                isSuccess = false;
                Reset();
            }
            if (!startFrame)
            {
                //启动时间计数器
                startFrame = true;
            }
            //将按键值添加如链表中
            playerSample.Add(currentkeyCode);
            //遍历链表
            int size = playerSample.Count;
            if (size == SAMPLE_COUNT)
            {
                for (int i = 0; i < SAMPLE_SIZE; i++)
                {
                    int SuccessCount = 0;
                    for (int j = 0; j < SAMPLE_COUNT; j++)
                    {
                        int temp = playerSample[j];
                        if (temp == Sample[i, j])
                        {
                            SuccessCount++;
                        }
                    }
                    //玩家按下的组合按键与仓库中的按键组合相同表示释放技能成功
                    if (SuccessCount == SAMPLE_COUNT)
                    {
                        isSuccess = true;
                        break;
                    }
                }
            }
        }
        if (startFrame)
        {
            //计数器++
            currentFrame++;
        }
        if (currentFrame >= FRAME_COUNT)
        {
            //计数器超时
            if (!isSuccess)
            {
                Reset();
            }
        }
    }
    void Reset()
    {
        //重置按键相关信息
        currentFrame = 0;
        startFrame = false;
        playerSample.Clear();
    }

    void UpdateKey()
    {
        //获取当前键盘的按键信息
        if (Input.GetKeyDown(KeyCode.W))
        {
            currentkeyCode = KEY_UP;
        }
        if (Input.GetKeyDown(KeyCode.S))
        {
            currentkeyCode = KEY_DOWN;
        }
        if (Input.GetKeyDown(KeyCode.A))
        {
            currentkeyCode = KEY_LEFT;
        }
        if (Input.GetKeyDown(KeyCode.D))
        {
            currentkeyCode = KEY_RIGHT;
        }
        if (Input.GetKeyDown(KeyCode.Space))
        {
            currentkeyCode = KEY_FIRT;
        }
    }
}