import { Component,HostListener, OnInit } from '@angular/core';

interface Tile {
  value: number;
  merged: boolean;
  position: { row: number; col: number };
}

@Component({
  selector: 'app-page-game',
  templateUrl: './page-game.component.html',
  styleUrls: ['./page-game.component.scss']
})


export class PageGameComponent implements OnInit {
  tiles: Tile[] = [];
  score: number = 0;
  gameOver: boolean = false;
  mouseDownPosition: { x: number; y: number } | null = null;


  ngOnInit() {
   
    this.resetGame();
  }




  resetGame() {
    this.tiles = [];
    this.score = 0;
    this.gameOver = false;

    

    for (let row = 0; row < 4; row++) {
      for (let col = 0; col < 4; col++) {
        this.tiles.push({ value: 0, merged: false, position: { row, col } });
      }
    }

    this.addRandomTile();
    this.addRandomTile();
  }

  addRandomTile() {
    const emptyTiles = this.tiles.filter(tile => tile.value === 0);

    if (emptyTiles.length === 0) {
      return;
    }

    const randomIndex = Math.floor(Math.random() * emptyTiles.length);
    emptyTiles[randomIndex].value = Math.random() < 0.9 ? 2 : 4;
  }

  getTileStyle(tile: Tile) {
    return {
      'background-color': this.getTileColor(tile),
      'color': this.getTileTextColor(tile)
    };
  }

  getTileColor(tile: Tile) {
    // Define your own color logic here based on the tile value
    // For simplicity, let's use a single color for all tiles
    return '#cdc1b4';
  }

  getTileTextColor(tile: Tile) {
    // Define your own text color logic here based on the tile value
    // For simplicity, let's use a single color for all tiles
    return '#776e65';
  }

  @HostListener('window:keydown', ['$event'])
  handleKeyDown(event: KeyboardEvent) {
    if (this.gameOver) {
      return;
    }

    let moved = false;

    switch (event.key) {
      case 'ArrowUp':
        moved = this.moveUp();
        break;
      case 'ArrowDown':
        moved = this.moveDown();
        break;
      case 'ArrowLeft':
        moved = this.moveLeft();
        break;
      case 'ArrowRight':
        moved = this.moveRight();
        break;
    }

    if (moved) {
      this.addRandomTile();
      this.checkGameOver();
    }
  }

  @HostListener('mousedown', ['$event'])
  handleMouseDown(event: MouseEvent) {
    this.mouseDownPosition = { x: event.clientX, y: event.clientY };
  }

  @HostListener('mouseup', ['$event'])
  handleMouseUp(event: MouseEvent) {
    if (this.mouseDownPosition) {
      const deltaX = event.clientX - this.mouseDownPosition.x;
      const deltaY = event.clientY - this.mouseDownPosition.y;
  
      if (Math.abs(deltaX) > Math.abs(deltaY)) {
        if (deltaX > 0) {
          this.handleKeyDown({ key: 'ArrowRight' } as KeyboardEvent);
        } else {
          this.handleKeyDown({ key: 'ArrowLeft' } as KeyboardEvent);
        }
      } else {
        if (deltaY > 0) {
          this.handleKeyDown({ key: 'ArrowDown' } as KeyboardEvent);
        } else {
          this.handleKeyDown({ key: 'ArrowUp' } as KeyboardEvent);
        }
      }
  
      this.mouseDownPosition = null;
    }
  }

  moveUp() {
    let moved = false;

    this.resetMergedFlags();

    for (let col = 0; col < 4; col++) {
      for (let row = 1; row < 4; row++) {
        const currentTile = this.getTile(row, col);

        if (currentTile.value !== 0) {
          let newRow = row - 1;

          while (newRow >= 0 && this.getTile(newRow, col).value === 0) {
            newRow--;
          }

          if (newRow >= 0) {
            const newTile = this.getTile(newRow, col);

            if (newTile.value === currentTile.value && !newTile.merged) {
              newTile.value *= 2;
              newTile.merged = true;
              this.score += newTile.value;
              currentTile.value = 0;
              moved = true;
            } else {
              const nextTile = this.getTile(newRow + 1, col);

              if (nextTile !== currentTile) {
                nextTile.value = currentTile.value;
                currentTile.value = 0;
                moved = true;
              }
            }
          } else {
            const nextTile = this.getTile(0, col);

            if (nextTile !== currentTile) {
              nextTile.value = currentTile.value;
              currentTile.value = 0;
              moved = true;
            }
          }
        }
        // if (!moved) {
        //   moved = true;
        // }
      }
    }
    // if (moved === false) {
    //   // 触发失败提示和重新开始游戏的操作
    //   this.showGameOver();
    //   this.resetGame();
    // }
    // this.checkGameOver();

    return moved;
  }

  moveDown() {
    let moved = false;

    this.resetMergedFlags();

    for (let col = 0; col < 4; col++) {
      for (let row = 2; row >= 0; row--) {
        const currentTile = this.getTile(row, col);

        if (currentTile.value !== 0) {
          let newRow = row + 1;

          while (newRow < 4 && this.getTile(newRow, col).value === 0) {
            newRow++;
          }

          if (newRow < 4) {
            const newTile = this.getTile(newRow, col);

            if (newTile.value === currentTile.value && !newTile.merged) {
              newTile.value *= 2;
              newTile.merged = true;
              this.score += newTile.value;
              currentTile.value = 0;
              moved = true;
            } else {
              const nextTile = this.getTile(newRow - 1, col);

              if (nextTile !== currentTile) {
                nextTile.value = currentTile.value;
                currentTile.value = 0;
                moved = true;
              }
            }
          } else {
            const nextTile = this.getTile(3, col);

            if (nextTile !== currentTile) {
              nextTile.value = currentTile.value;
              currentTile.value = 0;
              moved = true;
            }
          }
        }
        // if (!moved) {
        //   moved = true;
        // }
      }
    }
    // if (moved === false) {
    //   // 触发失败提示和重新开始游戏的操作
    //   this.showGameOver();
    //   this.resetGame();
    // }
    // this.checkGameOver();
    return moved;
  }

  moveLeft() {
    let moved = false;

    this.resetMergedFlags();

    for (let row = 0; row < 4; row++) {
      for (let col = 1; col < 4; col++) {
        const currentTile = this.getTile(row, col);

        if (currentTile.value !== 0) {
          let newCol = col - 1;

          while (newCol >= 0 && this.getTile(row, newCol).value === 0) {
            newCol--;
          }

          if (newCol >= 0) {
            const newTile = this.getTile(row, newCol);

            if (newTile.value === currentTile.value && !newTile.merged) {
              newTile.value *= 2;
              newTile.merged = true;
              this.score += newTile.value;
              currentTile.value = 0;
              moved = true;
            } else {
              const nextTile = this.getTile(row, newCol + 1);

              if (nextTile !== currentTile) {
                nextTile.value = currentTile.value;
                currentTile.value = 0;
                moved = true;
              }
            }
          } else {
            const nextTile = this.getTile(row, 0);

            if (nextTile !== currentTile) {
              nextTile.value = currentTile.value;
              currentTile.value = 0;
              moved = true;
            }
          }
        }
        // if (!moved) {
        //   moved = true;
        // }
      }
    }
    // if (moved === false) {
    //   // 触发失败提示和重新开始游戏的操作
    //   this.showGameOver();
    //   this.resetGame();
    // }
    // this.checkGameOver();
    return moved;
  }

  moveRight() {
    let moved = false;

    this.resetMergedFlags();

    for (let row = 0; row < 4; row++) {
      for (let col = 2; col >= 0; col--) {
        const currentTile = this.getTile(row, col);

        if (currentTile.value !== 0) {
          let newCol = col + 1;

          while (newCol < 4 && this.getTile(row, newCol).value === 0) {
            newCol++;
          }

          if (newCol < 4) {
            const newTile = this.getTile(row, newCol);

            if (newTile.value === currentTile.value && !newTile.merged) {
              newTile.value *= 2;
              newTile.merged = true;
              this.score += newTile.value;
              currentTile.value = 0;
              moved = true;
            } else {
              const nextTile = this.getTile(row, newCol - 1);

              if (nextTile !== currentTile) {
                nextTile.value = currentTile.value;
                currentTile.value = 0;
                moved = true;
              }
            }
          } else {
            const nextTile = this.getTile(row, 3);

            if (nextTile !== currentTile) {
              nextTile.value = currentTile.value;
              currentTile.value = 0;
              moved = true;
            }
          }
        }
        // if (!moved) {
        //   moved = true;
        // }
      }
    }
    // if (moved === false) {
    //   // 触发失败提示和重新开始游戏的操作
    //   this.showGameOver();
    //   this.resetGame();
    // }
    // this.checkGameOver();
    return moved;
  }

  resetMergedFlags() {
    this.tiles.forEach(tile => {
      tile.merged = false;
    });
  }

  checkGameOver() {
    const emptyTiles = this.tiles.filter(tile => tile.value === 0);

    if (emptyTiles.length > 0) {
      return;
    }

    for (let row = 0; row < 4; row++) {
      for (let col = 0; col < 4; col++) {
        const currentTile = this.getTile(row, col);

        if (
          (row < 3 && currentTile.value === this.getTile(row + 1, col).value) ||
          (col < 3 && currentTile.value === this.getTile(row, col + 1).value)
        ) {
          return;
        }
      }
    }


    this.gameOver = true;
  }

  getTile(row: number, col: number) {
    return this.tiles.find(tile => tile.position.row === row && tile.position.col === col)!;
  }

  // showGameOver() {
  //   // 在界面上显示失败提示，可以使用弹窗、消息框等方式
  //   alert("Game Over!");
  // }



  touchStart(event: TouchEvent) {
    this.mouseDownPosition = {
      x: event.touches[0].clientX,
      y: event.touches[0].clientY
    };
  }

  touchMove(event: TouchEvent) {
    if (!this.mouseDownPosition) {
      return;
    }

    const currentX = event.touches[0].clientX;
    const currentY = event.touches[0].clientY;

    const deltaX = currentX - this.mouseDownPosition.x;
    const deltaY = currentY - this.mouseDownPosition.y;

    if (Math.abs(deltaX) > 10 || Math.abs(deltaY) > 10) {
      if (Math.abs(deltaX) > Math.abs(deltaY)) {
        if (deltaX > 0) {
          this.handleKeyDown({ key: 'ArrowRight' } as KeyboardEvent);
        } else {
          this.handleKeyDown({ key: 'ArrowLeft' } as KeyboardEvent);
        }
      } else {
        if (deltaY > 0) {
          this.handleKeyDown({ key: 'ArrowDown' } as KeyboardEvent);
        } else {
          this.handleKeyDown({ key: 'ArrowUp' } as KeyboardEvent);
        }
      }

      this.mouseDownPosition = null;
    }




   

  }




}