// 该js文件中的函数主要是用于控制棋子路径，使其符合象棋的游戏规则，如马走日，象走田等。

// 设置小兵的路径规则
function binMove(tmap, c, y, x) {
  //0红 1黑
  var w;
  var h = 0;
  if (c == 0) {
    w = y < 5;
    h = -1;
  } else {
    w = y > 4;
    h = 1;
  }
  if (w) {
    if (y + h >= 0 && y + h < map.length) {
      var t1 = [];
      t1[0] = y + h;
      t1[1] = x;
      tmap.push(t1);
    }
    var t2 = [];
    var t3 = [];
    t2[0] = y;
    t3[0] = y;
    t2[1] = x - 1;
    t3[1] = x + 1;
    tmap.push(t2);
    tmap.push(t3);
  } else {
    var t = [];
    t[0] = y + h;
    t[1] = x;
    tmap.push(t);
  }
}

// 设置炮直线和竖线移动
function paoMove(tmap, c, y, x) {
  paoMove_(tmap, 0, c, y, x);
  paoMove_(tmap, 1, c, y, x);
  paoMove_(tmap, 2, c, y, x);
  paoMove_(tmap, 3, c, y, x);
}

// 设置炮隔子移动
function paoMove_(tmap, d, c, y, x) {
  //0上1左2下3右
  var q = y,
    w = x,
    qi = 0,
    wi = 0,
    ci = 0; //ci:0红 1黑
  if (c == 0) {
    ci = 1;
  } else {
    ci = -1;
  }
  var cc;
  switch (d) {
    case 0:
      cc = function (q) {
        return q >= 0;
      };
      qi = -1;
      break;
    case 1:
      cc = function (q, w) {
        return w >= 0;
      };
      wi = -1;
      break;
    case 2:
      cc = function (q) {
        return q < map.length;
      };
      qi = 1;
      break;
    case 3:
      cc = function (q, w) {
        return w < map.length;
      };
      wi = 1;
      break;
  }
  var ce = false;
  while (true) {
    if (!cc(q, w)) break;
    if (q == y && w == x) {
      q += qi;
      w += wi;
      continue;
    }
    if (map[q][w] == 0) {
      if (!ce) {
        var t = [];
        t[0] = q;
        t[1] = w;
        tmap.push(t);
      }
    } else {
      if (ce) {
        if (map[q][w] * ci < 0) {
          var t = [];
          t[0] = q;
          t[1] = w;
          tmap.push(t);
          ce = false;
          break;
        }
      }
      ce = true;
    }
    q += qi;
    w += wi;
  }
}

// 设置车的路径规则
function juMove(tmap, c, y, x) {
  for (var q = y; q >= 0; q--) {
    if (q == y) continue;
    if (!fastMove(tmap, c, q, x)) break;
  }
  for (var q = x; q >= 0; q--) {
    if (q == x) continue;
    if (!fastMove(tmap, c, y, q)) break;
  }
  for (var q = y; q < map.length; q++) {
    if (q == y) continue;
    if (!fastMove(tmap, c, q, x)) break;
  }
  for (var q = x; q < map.length; q++) {
    if (q == x) continue;
    if (!fastMove(tmap, c, y, q)) break;
  }
}

// 设置车的水平和垂直移动
function fastMove(tmap, c, y, x) {
  //c:0红 1黑
  var ci = 0;
  if (c == 0) {
    ci = 1;
  } else {
    ci = -1;
  }
  if (map[y][x] == 0) {
    var t = [];
    t[0] = y;
    t[1] = x;
    tmap.push(t);
    return true;
  } else {
    if (map[y][x] * ci < 0) {
      var t = [];
      t[0] = y;
      t[1] = x;
      tmap.push(t);
    }
    return false;
  }
}

// 设置马的路径规则
function maMove(tmap, c, y, x) {
  function fastMa(tmap, y, x, ys, xs, c) {
    if (
      y + ys < map.length &&
      y + ys >= 0 &&
      x + xs < map.length &&
      x + xs >= 0
    )
      if (map[y + ys][x + xs] == 0) {
        var yz = 0,
          xz = 0;
        if (ys == 0) {
          yz = -1;
        } else {
          xz = -1;
        }
        if (
          y + ys + ys - yz < map.length &&
          y + ys + ys - yz >= 0 &&
          x + xs + xs - xz < map.length &&
          x + xs + xs - xz >= 0
        )
          if (map[y + ys + ys - yz][x + xs + xs - xz] * c <= 0) {
            var t = [];
            t[0] = y + ys + ys - yz;
            t[1] = x + xs + xs - xz;
            tmap.push(t);
          }
        if (
          y + ys + ys + yz < map.length &&
          y + ys + ys + yz >= 0 &&
          x + xs + xs + xz < map.length &&
          x + xs + xs + xz >= 0
        )
          if (map[y + ys + ys + yz][x + xs + xs + xz] * c <= 0) {
            var t1 = [];
            t1[0] = y + ys + ys + yz;
            t1[1] = x + xs + xs + xz;
            tmap.push(t1);
          }
      }
  }
  var cc = 0;
  if (c == 0) {
    cc = 1;
  } else {
    cc = -1;
  }
  fastMa(tmap, y, x, -1, 0, cc);
  fastMa(tmap, y, x, 1, 0, cc);
  fastMa(tmap, y, x, 0, -1, cc);
  fastMa(tmap, y, x, 0, 1, cc);
}

// 设置象的路径规则
function xiangMove(tmap, c, y, x) {
  //c:0红 1黑
  function fastXiang(tmap, y, x, yy, xx, c, cy) {
    if (
      y + yy * 2 < map.length &&
      y + yy * 2 >= 0 &&
      x + xx * 2 < map.length &&
      x + xx * 2 >= 0
    ) {
      if (cy(y + yy * 2))
        if (map[y + yy][x + xx] == 0) {
          if (map[y + yy * 2][x + xx * 2] * c <= 0) {
            var t = [];
            t[0] = y + yy * 2;
            t[1] = x + xx * 2;
            tmap.push(t);
          }
        }
    }
  }
  var cc = 0;
  if (c == 0) {
    cc = 1;
  } else {
    cc = -1;
  }
  var ch;
  if (c == 0) {
    ch = function (y) {
      return y > 4;
    };
  } else {
    ch = function (y) {
      return y < 5;
    };
  }
  fastXiang(tmap, y, x, 1, 1, cc, ch);
  fastXiang(tmap, y, x, 1, -1, cc, ch);
  fastXiang(tmap, y, x, -1, 1, cc, ch);
  fastXiang(tmap, y, x, -1, -1, cc, ch);
}

// 设置士的路径规则
function shiMove(tmap, c, y, x) {
  //c:0红 1黑
  function fastShi(tmap, y, x, yy, xx, c, cc) {
    if (cc(y + yy)) {
      if (x + xx >= 3 && x + xx <= 5) {
        if (map[y + yy][x + xx] * c <= 0) {
          var t = [];
          t[0] = y + yy;
          t[1] = x + xx;
          tmap.push(t);
        }
      }
    }
  }
  var cf;
  var cc = 0;
  if (c == 0) {
    cc = 1;
    cf = function (y) {
      return y >= 7 && y <= 9;
    };
  } else {
    cf = function (y) {
      return y >= 0 && y <= 2;
    };
    cc = -1;
  }
  fastShi(tmap, y, x, 1, 1, cc, cf);
  fastShi(tmap, y, x, -1, 1, cc, cf);
  fastShi(tmap, y, x, 1, -1, cc, cf);
  fastShi(tmap, y, x, -1, -1, cc, cf);
}

// 设置将和帅的路径规则
function JSMove(tmap, c, y, x) {
  function fastJS(tmap, y, x, yy, xx, c, cc) {
    if (cc(y + yy)) {
      if (x + xx >= 3 && x + xx <= 5) {
        if (map[y + yy][x + xx] * c <= 0) {
          var t = [];
          t[0] = y + yy;
          t[1] = x + xx;
          tmap.push(t);
        }
      }
    }
  }
  var cf;
  var cc = 0;
  if (c == 0) {
    cc = 1;
    cf = function (y) {
      return y >= 7 && y <= 9;
    };
  } else {
    cf = function (y) {
      return y >= 0 && y <= 2;
    };
    cc = -1;
  }
  fastJS(tmap, y, x, 1, 0, cc, cf);
  fastJS(tmap, y, x, -1, 0, cc, cf);
  fastJS(tmap, y, x, 0, -1, cc, cf);
  fastJS(tmap, y, x, 0, 1, cc, cf);
  if (c == 0) {
    for (var q = y - 1; q < map.length && q >= 0; q--) {
      if (map[q][x] == 0) {
        continue;
      }
      if (map[q][x] == -7) {
        var t = [];
        t[0] = q;
        t[1] = x;
        tmap.push(t);
      } else break;
    }
  } else {
    for (var q = y + 1; q < map.length && q >= 0; q++) {
      if (map[q][x] == 0) {
        continue;
      }
      if (map[q][x] == 7) {
        var t = [];
        t[0] = q;
        t[1] = x;
        tmap.push(t);
      } else break;
    }
  }
}