//游戲界面（作為俄羅斯方塊在各個(gè)格子上渲染顏色的依據(jù)）
let checkerboardInfo = reactive([]);

//設(shè)置游戲界面
const setCheckerboard = () =>{
  for (let i = 0; i < 25; i++) {
    for (let j = 0; j < 16; j++) {
      checkerboardInfo.push([i, j, 0])
    }
  }
}

/存儲(chǔ)當(dāng)前還在墜落的方格坐標(biāo)
let moveSquareCoordinate = null;

/方塊類型(長(zhǎng)方形、三角形、正方形，z字型, 反z字型，l型， 反l型)
let squareType = [0, 1, 2, 3, 4, 5, 6];

//方塊類型下標(biāo)
let squareTypeIndex = -1;

//隨機(jī)選取方塊
const randomSquareType = ()=>{
  squareTypeIndex = Math.floor(Math.random()*(7));
};

//構(gòu)造方塊
const setSquare = () =>{
  randomSquareType();
  switch(squareTypeIndex) {

    //長(zhǎng)方形
    case 0:
      moveSquareCoordinate = [[0, 6], [0, 7], [0, 8], [0, 9]]
      break;

    //三角形
    case 1:
      moveSquareCoordinate = [[0, 8], [0, 9], [0, 10], [1, 9]]
      break;
    
    //正方形
    case 2:
      moveSquareCoordinate = [[0, 7], [0, 8], [1, 7], [1, 8]]
      break;

    //z字型
    case 3:
      moveSquareCoordinate = [[0, 7], [0, 8], [1, 8], [1, 9]]
      break;

    //反z字型
    case 4:
      moveSquareCoordinate = [[0, 8], [0, 7], [1, 7], [1, 6]]
      break;

    //l型
    case 5:
      moveSquareCoordinate = [[0, 8], [0, 9], [0, 10], [1, 8]]
      break;

    //反l型
    case 6:
      moveSquareCoordinate = [[0, 8], [0, 9], [0, 10], [1, 10]]
      break;
  }
}

//存儲(chǔ)當(dāng)前已經(jīng)穩(wěn)定墜落的方塊的坐標(biāo)
let stabilitySquareCoordinate = [];

//改變棋盤(pán)格子顏色（[A, B]為坐標(biāo)，color是需要渲染為什么顏色（0為白色，1為紅色，2為綠色））
const changeCheckerboard = ([A, B], color) => {
  for (let i = 0; i < checkerboardInfo.length; i++) {
      let [x, y, num] = checkerboardInfo[i];
      if( A===x && B===y ){
        checkerboardInfo[i][2]=color;
        break
      }
    }
};

//清空棋盤(pán)顏色
const clearCheckerboard = () => {
  for (let index = 0; index < checkerboardInfo.length; index++) {
    checkerboardInfo[index][2] = 0
  }
};

//判斷是否碰到邊界（arr為可移動(dòng)俄羅斯方塊上單個(gè)的坐標(biāo)點(diǎn)）
const judgeBoundary = (arr) => {
  if((arr[0]<0||arr[0]>24)||(arr[1]<0||arr[1]>15)){
    return true
  };
  return false
}

//查看方塊是否碰到已經(jīng)存在的方格中（arr為可移動(dòng)俄羅斯方塊上單個(gè)的坐標(biāo)點(diǎn)）
const judgeStabilitySquareCoordinate = (arr) =>{
  //移動(dòng)到最后一格時(shí)
  if( arr[0] === 24 ){
    return true
  }
  
  //遍歷不可移動(dòng)的俄羅斯方塊與該點(diǎn)做比較
  for (let index = 0; index < stabilitySquareCoordinate.length; index++) {
    if(stabilitySquareCoordinate[index][0]-1 === arr[0] && stabilitySquareCoordinate[index][1] === arr[1]){
      return true
    }
  };
  return false;
}

//得分（arr為可移動(dòng)俄羅斯方塊上單個(gè)的坐標(biāo)點(diǎn)）
const score = (arr)=>{
  let num = 0;
  for (let index = 0; index < stabilitySquareCoordinate.length; index++) {
    if(arr[0] === stabilitySquareCoordinate[index][0]){
      num++;
      //等于16后滿足當(dāng)前銷毀需求（直接跳出循環(huán)減少性能消耗）
      if(num === 16){
        break;
      }
    }    
  };
  if(num === 16){
  
    //刪除已經(jīng)在該數(shù)組中湊齊能得分的行數(shù)（小技巧，倒著循環(huán)數(shù)組能保證每個(gè)符合刪除條件的數(shù)據(jù)都能被刪除）
    for (let index = stabilitySquareCoordinate.length-1; index >-1; index--) {
      if(arr[0] === stabilitySquareCoordinate[index][0]){
        stabilitySquareCoordinate.splice(index, 1)
      }
    }
    
    //將所有在銷毀行上面的穩(wěn)定方塊移動(dòng)至下一行去
    for (let index = 0; index < stabilitySquareCoordinate.length; index++) {
      if(arr[0] > stabilitySquareCoordinate[index][0]){
        stabilitySquareCoordinate[index][0]++
      }
    }
  }
}

//事件（方便后期摘除事件）
const listener = (event)=>{
  //只監(jiān)聽(tīng)上下左右四個(gè)按鍵
  const keyCodeArr =  [37, 39, 40];
  if(keyCodeArr.includes(event.keyCode)){
    //監(jiān)聽(tīng)方向鍵變化（執(zhí)行方塊移動(dòng)方向）
    moveSquare(event.keyCode);
  }
}

//定時(shí)器(一直會(huì)有一個(gè)下移方塊指令執(zhí)行)
let timer = setInterval(()=>{
  moveSquare(40)
},500);

//在window上掛載事件監(jiān)聽(tīng)器
window.addEventListener("keydown", listener);

//移動(dòng)方塊的指令
const moveSquare = (num) => {
  if( !isShowSquare.value ){
    return
  };

  //移動(dòng)
  for (let index = 0; index < moveSquareCoordinate.length; index++) {
    switch (num) {
      //鍵盤(pán)對(duì)應(yīng)數(shù)字如下
      //40:下；37：左；39：右；
      case 37:
        moveSquareCoordinate[index][1] = moveSquareCoordinate[index][1]-1
        break;
      case 39:
        moveSquareCoordinate[index][1] = moveSquareCoordinate[index][1]+1
        break;
      case 40:
        moveSquareCoordinate[index][0] = moveSquareCoordinate[index][0]+1
        break;
    };
  };

  //是否超過(guò)邊界的標(biāo)桿
  let flag1 = false;
  for (let index = 0; index < moveSquareCoordinate.length; index++) {
    if(judgeBoundary(moveSquareCoordinate[index])){
      flag1 = true;
    }
  }

  //標(biāo)桿滿足后方塊復(fù)位
  if(flag1){
    for (let index = 0; index < moveSquareCoordinate.length; index++) {
      switch (num) {
        case 37:
          moveSquareCoordinate[index][1] = moveSquareCoordinate[index][1]+1
          break;
        case 39:
          moveSquareCoordinate[index][1] = moveSquareCoordinate[index][1]-1
          break;
        case 40:
          moveSquareCoordinate[index][0] = moveSquareCoordinate[index][0]-1
          break;
      };
    };
  }

  //能否觸碰到已穩(wěn)定方塊的標(biāo)桿
  let flag2 = false;
  let coordinate = [];
  for (let index = 0; index < moveSquareCoordinate.length; index++) {
    if(judgeStabilitySquareCoordinate(moveSquareCoordinate[index])){
      flag2 = true;
    }
  };

  //只要碰到了
  if (flag2) {

    //添加進(jìn)入不移動(dòng)的方塊坐標(biāo)數(shù)組
    for (let index = 0; index < moveSquareCoordinate.length; index++) {
      stabilitySquareCoordinate.push(moveSquareCoordinate[index]);
      if(moveSquareCoordinate[index][0]-1 === 0){
        //輸了就跳出循環(huán)，不必再給已穩(wěn)定的方塊坐標(biāo)添加新坐標(biāo)了
        isFail.value = true;
        break
      }
    }

    //如果已經(jīng)失敗則停止移動(dòng)
    if (isFail.value) {
      return
    }
    isShowSquare.value = false;

    //將移動(dòng)方塊中每個(gè)點(diǎn)坐標(biāo)去做得分判斷
    for (let index = 0; index < moveSquareCoordinate.length; index++) {
      score(moveSquareCoordinate[index]);
    }
  }
  
  //重新渲染游戲界面顏色
  clearCheckerboard();
  for (let index = 0; index < moveSquareCoordinate.length; index++) {
    changeCheckerboard(moveSquareCoordinate[index], 2)
  }
  for (let index = 0; index < stabilitySquareCoordinate.length; index++) {
    changeCheckerboard(stabilitySquareCoordinate[index], 1)
  }
};

const detectionToolAboutRectangle = () => {
  if (moveSquareCoordinate[0][0] !== moveSquareCoordinate[1][0]) {
    //豎直的方塊
    return 0
  }

  //橫著的長(zhǎng)方形方塊
  return 1
};

//檢驗(yàn)工具（z字形和反z字形）
const detectionToolAboutZOr_Z = () => {
  if(moveSquareCoordinate[0][0] === moveSquareCoordinate[1][0]){
    //z字形
    return 0
  }
  //n字形
  return 1
};

//檢驗(yàn)工具（三角形、l型、反l型）
const detectionToolAboutTriangle = () => {
  
  //判斷四種形態(tài)
  if ((moveSquareCoordinate[0][0] === moveSquareCoordinate[1][0] && moveSquareCoordinate[1][0] === moveSquareCoordinate[2][0]) && moveSquareCoordinate[1][0]<moveSquareCoordinate[3][0]) {
    return 0
  }
  if ((moveSquareCoordinate[0][1] === moveSquareCoordinate[1][1] && moveSquareCoordinate[1][1] === moveSquareCoordinate[2][1]) && moveSquareCoordinate[2][1]>moveSquareCoordinate[3][1]) {
    return 1
  }
  if ((moveSquareCoordinate[0][0] === moveSquareCoordinate[1][0] && moveSquareCoordinate[1][0] === moveSquareCoordinate[2][0]) && moveSquareCoordinate[1][0]>moveSquareCoordinate[3][0]) {
    return 2
  }
  if ((moveSquareCoordinate[0][1] === moveSquareCoordinate[1][1] && moveSquareCoordinate[1][1] === moveSquareCoordinate[2][1]) && moveSquareCoordinate[2][1]<moveSquareCoordinate[3][1]) {
    return 3
  }
};

const toggleSquareShapeAboutL= () => {
  
  //改變后的俄羅斯方塊數(shù)組
  let arr = null;
  
  //滿足哪種形態(tài)則將后一種形態(tài)的坐標(biāo)點(diǎn)存儲(chǔ)進(jìn)該數(shù)組中
  switch (detectionToolAboutTriangle()) {
    case 0:
      arr = [[moveSquareCoordinate[1][0]-1,moveSquareCoordinate[1][1]],[moveSquareCoordinate[1][0],moveSquareCoordinate[1][1]],[moveSquareCoordinate[1][0]+1,moveSquareCoordinate[1][1]],[moveSquareCoordinate[1][0]-1,moveSquareCoordinate[1][1]-1]];
      
      //判斷每個(gè)點(diǎn)會(huì)不會(huì)超出游戲界面或者觸碰到不可移動(dòng)的俄羅斯方塊上
      for (let index = 0; index < arr.length; index++) {
        if(judgeBoundary(arr[index]) || judgeStabilitySquareCoordinate(arr[index])){
          return
        }
      }
      moveSquareCoordinate = arr;
      clearCheckerboard();
      for (let index = 0; index < moveSquareCoordinate.length; index++) {
        changeCheckerboard(moveSquareCoordinate[index], 2)
      }
      for (let index = 0; index < stabilitySquareCoordinate.length; index++) {
        changeCheckerboard(stabilitySquareCoordinate[index], 1)
      }
      break;
    case 1:
      arr = [[moveSquareCoordinate[1][0],moveSquareCoordinate[1][1]+1],[moveSquareCoordinate[1][0],moveSquareCoordinate[1][1]],[moveSquareCoordinate[1][0],moveSquareCoordinate[1][1]-1],[moveSquareCoordinate[1][0]-1,moveSquareCoordinate[1][1]+1]];
      for (let index = 0; index < arr.length; index++) {
        if(judgeBoundary(arr[index]) || judgeStabilitySquareCoordinate(arr[index])){
          return
        }
      }
      moveSquareCoordinate = arr;
      clearCheckerboard();
      for (let index = 0; index < moveSquareCoordinate.length; index++) {
        changeCheckerboard(moveSquareCoordinate[index], 2)
      }
      for (let index = 0; index < stabilitySquareCoordinate.length; index++) {
        changeCheckerboard(stabilitySquareCoordinate[index], 1)
      }
      break;
    case 2:
      arr = [[moveSquareCoordinate[1][0]+1,moveSquareCoordinate[1][1]],[moveSquareCoordinate[1][0],moveSquareCoordinate[1][1]],[moveSquareCoordinate[1][0]-1,moveSquareCoordinate[1][1]],[moveSquareCoordinate[1][0]+1,moveSquareCoordinate[1][1]+1]];
      for (let index = 0; index < arr.length; index++) {
        if(judgeBoundary(arr[index]) || judgeStabilitySquareCoordinate(arr[index])){
          return
        }
      }
      moveSquareCoordinate = arr;
      clearCheckerboard();
      for (let index = 0; index < moveSquareCoordinate.length; index++) {
        changeCheckerboard(moveSquareCoordinate[index], 2)
      }
      for (let index = 0; index < stabilitySquareCoordinate.length; index++) {
        changeCheckerboard(stabilitySquareCoordinate[index], 1)
      }
      break;
    case 3:
      arr = [[moveSquareCoordinate[1][0],moveSquareCoordinate[1][1]-1],[moveSquareCoordinate[1][0],moveSquareCoordinate[1][1]],[moveSquareCoordinate[1][0],moveSquareCoordinate[1][1]+1],[moveSquareCoordinate[1][0]+1,moveSquareCoordinate[1][1]-1]];
      for (let index = 0; index < arr.length; index++) {
        if(judgeBoundary(arr[index]) || judgeStabilitySquareCoordinate(arr[index])){
          return
        }
      }
      
      //給移動(dòng)的俄羅斯方塊數(shù)組重新賦值
      moveSquareCoordinate = arr;
      
      //重新渲染游戲界面
      clearCheckerboard();
      for (let index = 0; index < moveSquareCoordinate.length; index++) {
        changeCheckerboard(moveSquareCoordinate[index], 2)
      }
      for (let index = 0; index < stabilitySquareCoordinate.length; index++) {
        changeCheckerboard(stabilitySquareCoordinate[index], 1)
      }
      break;
  }
};

const props = defineProps({
  checkerboardItemInfo:Array,
});

//通過(guò)toRefs解構(gòu)方格信息數(shù)組中的第三個(gè)值（只有使用toRefs才能保持該引用數(shù)據(jù)解構(gòu)后的數(shù)據(jù)依然保持響應(yīng)式）
let [ x, y, num] = toRefs(props.checkerboardItemInfo)

let color = ref('');

//使用監(jiān)聽(tīng)器完成數(shù)據(jù)監(jiān)聽(tīng)，給背景色設(shè)置不同值
watchEffect(()=>{
  switch (num.value) {
    case 0:
      color.value = 'while'
      break;
    case 1:
      color.value = 'red'
      break;
    case 2:
      color.value = 'green'
      break;
  }
})

<style lang="less" scoped>
.checkerboardItem{
  //vue3.2能在css中使用v-bind綁定響應(yīng)式數(shù)據(jù)
  background-color: v-bind(color);
}
</style>