package man;

import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;
import javax.microedition.lcdui.game.GameCanvas;

/**
 *
 */

public class ManGameCanvas extends GameCanvas
    implements Runnable, CommandListener {

  //--- 定義變量 ----------------------------------------------------------------
  private ManMIDlet manMIDlet;
  private Command Cmdstart, Cmdrestart;   // 開始、重新開始按鍵
  private int SWidth, SHeight;            // 屏幕寬度和高度
  private int KeyState;                   // 當前按鍵狀態
  private Graphics ManGraphics;           // 定義屏幕的畫布
  private TiledLayer TLBackground;        // 平鋪層對象
  private Sprite SpPlane;                 // 飛機圖象
  private ManBullets MBbullets;           // 子彈圖象
  private NumImgTools TimeFont;           // 時間文字
  public Sprite SpExplosion;              // 飛機爆炸效果圖象
  private Sprite SpBomb;                  // 炸彈爆炸效果圖片
  private Image ImgBombIcon;              // 炸彈圖標
  private NumImgTools BombFont;           // 炸彈個數文字
  private int BombCount;                  // 炸彈個數
  private boolean useBomb;                // 是否使用炸彈
  private Thread ThRunGame;               // 線程
  private boolean running;                // 當前運行狀態
  public boolean gameover;                // 程序是否已經結束
  private long GameStartTime;             // 游戲開始時間
  private int ExplosionFrame;             // 飛機爆炸幀數控制累加器
  private int BombFrame;                  // 炸彈爆炸幀數控制累加器
  int a;

  //--- 構造函數 ----------------------------------------------------------------
  protected ManGameCanvas(ManMIDlet manMIDlet) {
    super(false);   // 調用父類的構造方法,必須這樣，否則無法編譯
    this.manMIDlet = manMIDlet;

    // 添加按鍵，并開啟監聽
    addCommand(new Command("退出", Command.EXIT, 1));
    addCommand(Cmdstart = new Command("開始", Command.OK, 1));
    setCommandListener(this);

    SWidth = getWidth();     // 獲得設備屏幕寬度
    SHeight = getHeight();   // 獲得設備屏幕高度
    running = false;         // 當前運行狀態
    ThRunGame = null;        // 線程初始化

    ManGraphics = getGraphics();  // 獲得當前屏幕的畫布

    //--- 初始化背景圖象 ---
    Image img = ImageTools.getImage("/pic/back_water.png");
    int backcols = SWidth / img.getWidth() + 1; // 計算橫向需要多少圖片
    int backrows = SHeight / img.getHeight() + 1;  // 計算縱向需要多少圖片
    // 初始化平鋪層對象，將圖象平鋪顯示
    TLBackground = new TiledLayer(backcols, backrows, img, img.getWidth(), img.getHeight());
    // 循環平鋪操作，x,y為相對坐標，？？？setCell中的1不知是什么意思？？？
    for (int i = 0; i < backcols * backrows; i++)
      TLBackground.setCell(i % backcols, i / backcols, 1);

    //--- 初始化小飛機圖象 ---
    img = ImageTools.getImage("/pic/MyPlaneFrames.png");
    SpPlane = new Sprite(img, 24, 24);

    //--- 初始化記時數字圖象 ---
    img = ImageTools.getImage("/pic/b_number.png");
    TimeFont = new NumImgTools(ManGraphics, img, 10, 15);

    //--- 初始化子彈圖象 ---
    img = ImageTools.getImage("/pic/bullet.png");
    MBbullets = new ManBullets(this, img, SWidth, SHeight);

    //--- 初始化飛機爆炸效果圖片 ---
    img = ImageTools.getImage("/pic/explosion.png");
    SpExplosion = new Sprite(img, 32, 32);

    //--- 初始化炸彈爆炸效果圖片 ---
    img = ImageTools.getImage("/pic/bomb.png");
    SpBomb = new Sprite(img, 65, 65);

    //--- 初始化炸彈圖標 ---
    ImgBombIcon = ImageTools.getImage("/pic/bomb_icon.png");

    //--- 初始化記時數字圖象 ---
    img = ImageTools.getImage("/pic/s_number.png");
    BombFont = new NumImgTools(ManGraphics, img, 5, 7);
  }

  //--- 線程主運行 --------------------------------------------------------------
  public void run(){
    long st = 0, et = 0, diff = 0;
    int GameTime = 0, TempTime = 0;
    int rate = 50;  // 16-17 幀/每妙
    while (running) {
      st = System.currentTimeMillis();

      ManGraphics.setColor(0, 0, 0);   // 清空屏幕
      ManGraphics.fillRect(0, 0, SWidth, SHeight);

      TLBackground.paint(ManGraphics);   // 畫出背景圖象

      if (!gameover) {
        SpPlane.paint(ManGraphics); // 畫出飛機圖象
        MBbullets.paint(ManGraphics, SpPlane.getX(), SpPlane.getY());  // 畫出子彈
        GameKeyInput(); // 游戲操作
        // 獲得游戲時間
        TempTime = (int)(System.currentTimeMillis() - GameStartTime) / 1000;
        if (GameTime != TempTime) {
          GameTime = TempTime;
          // 每隔20秒獎勵一個炸彈
          if (GameTime % 20 == 0 && GameTime != 0) ++BombCount;
        }
        if (GameTime == 99) {   // 若游戲時間達到99秒，強行退出游戲
          ExplosionFrame = 3;
          gameover = true;
        }
        if (useBomb) {   // 若使用炸彈，顯示爆炸效果
          if (BombFrame < 6) {
            SpBomb.setFrame(++BombFrame);
            SpBomb.paint(ManGraphics);
            MBbullets.BombBullets(SpPlane.getX(), SpPlane.getY());
          }
          else useBomb = false;
        }
      }
      // 如果游戲已經結束
      else {
        if (ExplosionFrame < 3) {   // 顯示爆炸效果
          SpExplosion.setFrame(++ExplosionFrame);
          SpExplosion.paint(ManGraphics);
        }
        else {   // 顯示評語
          String GameOverStr;
          if (GameTime < 10) GameOverStr = "你是在用腳玩嗎？";
          else if (GameTime < 16) GameOverStr = "再來一次，你能做到！";
          else if (GameTime < 20) GameOverStr = "同情你，再來一次！";
          else if (GameTime < 25) GameOverStr = "非常好，你是一個真正的男人！";
          else if (GameTime < 30) GameOverStr = "你是玩這個游戲的天才！";
          else if (GameTime < 40) GameOverStr = "真不敢相信，這個游戲難道是你做的？";
          else if (GameTime < 99) GameOverStr = "噢，我的上帝！你是人類嗎？";
          else GameOverStr = "我很遺憾，你可以不用再完這個游戲了！";

          ManGraphics.setColor(255,255,255);
          ManGraphics.drawString(GameOverStr, 5, 25, ManGraphics.LEFT | ManGraphics.TOP);
        }
      }
      // 畫出記時文字
      TimeFont.drawNums(GameTime, (SWidth - 14 * 2) / 2, 10, 2);
      // 畫出炸彈圖標
      ManGraphics.drawImage(ImgBombIcon, 0, SHeight - 1, ManGraphics.BOTTOM | ManGraphics.LEFT);
      // 畫出炸彈個數文字
      BombFont.drawNum(BombCount, ImgBombIcon.getWidth() + 1, SHeight - 8);
    ManGraphics.drawString(String.valueOf(a), 5, 50, ManGraphics.LEFT | ManGraphics.TOP);

      flushGraphics();   // 刷新圖象顯示，沒這句不顯示圖片

      et = System.currentTimeMillis();
      // 不滿足幀數要求，暫停線程至要求幀數
      diff = et - st;
      if (diff < rate) {
        try {
          Thread.sleep(rate - diff);
        }
        catch (InterruptedException ex) {
          System.out.println(ex);
        }
      }
    }
  }

  //--- 監聽按鍵 ----------------------------------------------------------------
  public void commandAction(Command command, Displayable displayable) {
    // 退出操作
    if (command.getCommandType() == Command.EXIT) {
      if (running)   // 結束線程
        running = false;
      manMIDlet.quitApp();
    }
    // 開始操作
    else if (command == Cmdstart) {
      if (!running) {
        running = true;
        GameInit();   // 游戲初始化
        ThRunGame = new Thread(this);   // 初始化線程
        ThRunGame.start();
      }
      removeCommand(Cmdstart);
      addCommand(Cmdrestart = new Command("重新開始", Command.OK, 1));
    }
    // 重新開始操作
    else if (command == Cmdrestart) {
      GameInit();
    }
  }

  //--- 游戲初始化 --------------------------------------------------------------
  private void GameInit() {
    gameover = false;
    // 初始化飛機圖象
    SpPlane.setFrame(0);
    SpPlane.setPosition((SWidth - SpPlane.getWidth()) / 2,
                        (SHeight - SpPlane.getHeight()) / 2);

    MBbullets.InitBulletsLocus();

    GameStartTime = System.currentTimeMillis();

    ExplosionFrame = -1;

    BombCount = 3;

    useBomb = false;
  }


  //--- 游戲操作 ----------------------------------------------------------------
  private void GameKeyInput() {
    SpPlane.setFrame(0);
    KeyState = getKeyStates();   // 獲得當前按鍵狀態
    // 根據按鍵狀態，飛機圖象做相對移動，并判斷是否超出屏幕邊界
    if ((KeyState & UP_PRESSED) != 0) {      // 上
      if (SpPlane.getY() - 3 < 0)
        SpPlane.move(0, 0 - SpPlane.getY());
      else
        SpPlane.move(0, -3);
      SpPlane.setFrame(0);
    }
    if ((KeyState & DOWN_PRESSED) != 0) {    // 下
      if (SpPlane.getY() + 3 + SpPlane.getHeight() > SHeight)
        SpPlane.move(0, SHeight - SpPlane.getY() - SpPlane.getHeight());
      else
        SpPlane.move(0, 3);
      SpPlane.setFrame(0);
    }
    if ((KeyState & LEFT_PRESSED) != 0) {    // 左
      if (SpPlane.getX() - 3 < 0)
        SpPlane.move(0 - SpPlane.getX(), 0);
      else
        SpPlane.move(-3, 0);
      SpPlane.setFrame(1);
    }
    if ((KeyState & RIGHT_PRESSED) != 0) {   // 右
      if (SpPlane.getX() + 3 + SpPlane.getWidth() > SWidth)
        SpPlane.move(SWidth - SpPlane.getX() - SpPlane.getWidth(), 0);
      else
        SpPlane.move(3, 0);
      SpPlane.setFrame(2);
    }
    if ((KeyState & 4096) != 0) {            // 中
      if (!useBomb && BombCount > 0) {
        BombCount--;
        SpBomb.setPosition(SpPlane.getX() - 20, SpPlane.getY() - 20);
        useBomb = true;
        BombFrame = -1;
      }
    }
  }

  protected void keyPressed(int key) {
    a = key;
    System.out.println(key);
    //repaint();
  }

 /* public void paint(Graphics graphics) {
    graphics.drawString(String.valueOf(a), 5, 100, ManGraphics.LEFT | ManGraphics.TOP);
  }*/

}