/**
 * 語音通話的聲波控件
 * Created by Mr.LongFace on 2017/9/16.
 */
public class SoundWavesView extends View {

  private int mMini; // 最短值
  private int mMax; // 最大值
  private int mLineWidth; // 每條聲波的寬度
  private int mSoundNum = 5; // 聲波的數(shù)量
  private int mSpac; // 每條聲波的中點(diǎn)
  private int mWidth , mHeight; // 控件寬高
  private boolean isRun = false;

  private Paint mPaint;
  private RectF mRectF;
  private List<SoundLine> mSoundList = new ArrayList<>();
  private Handler mHandler = new Handler();
  private Runnable mInvalidateRun = new Runnable() {
    @Override
    public void run() {
      postInvalidate();
    }
  };

  public SoundWavesView(Context context, @Nullable AttributeSet attrs) {
    super(context, attrs);
    mPaint = new Paint();
    mPaint.setAntiAlias(true);
    mPaint.setColor(getResources().getColor(R.color.color_red));
    mPaint.setStyle(Paint.Style.FILL);
    mRectF = new RectF();
  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    if (widthMeasureSpec > 0 && heightMeasureSpec > 0) {
      initParam();
    }
  }

  private void initParam() {
    mWidth = getWidth();
    mHeight = getHeight();
    mMini = (int) (mHeight * 0.3f);
    mMax = mHeight;
    initLines();
  }

  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    for (int i = 0; i < mSoundNum; i++) {
      SoundLine sound = mSoundList.get(i);
      mRectF.left = sound.left;
      mRectF.right = sound.right;
      mRectF.top = sound.top;
      mRectF.bottom = sound.bottom;
      canvas.drawRoundRect(mRectF , mLineWidth / 2 , mLineWidth / 2 , mPaint);
    }
    if (isRun) {
      mHandler.postDelayed(mInvalidateRun, 10);
    }
  }

  @Override
  protected void onVisibilityChanged(@NonNull View changedView, int visibility) {
    super.onVisibilityChanged(changedView, visibility);
    if (isRun) {
      if (visibility == VISIBLE) {
        if (mWidth == 0) {
          initParam();
        }
        if (mSoundList != null && mSoundList.size() > 0) {
          for (SoundLine soundLine : mSoundList) {
            soundLine.start();
          }
        }
      }else{
        if (mSoundList != null && mSoundList.size() > 0) {
          for (SoundLine soundLine : mSoundList) {
            soundLine.stop();
          }
        }
      }
    }
  }

  public void start() {
    if (!isRun) {
      isRun = true;
      for (SoundLine sound : mSoundList) {
        sound.start();
      }
      postInvalidate();
    }
  }

  public void stop(){
    if (isRun) {
      isRun = false;
      for (SoundLine sound : mSoundList) {
        sound.stop();
      }
    }
  }

  private void initLines() {
    mLineWidth = (int) (mWidth / mSoundNum * 0.7f);
    mSpac = mWidth / (mSoundNum - 1);
    mSoundList.clear();
    chaos();
  }

  /**
   * 生成凌亂的
   */
  private void chaos() {
    for (int i = 0; i < mSoundNum; i++) {
      int left = i * mSpac - mLineWidth / 2;
      int right = i * mSpac + mLineWidth / 2;
      SoundLine s = new SoundLine(left , right , 0 , mHeight);
      s.setMode(SoundLine.SPEED_RAN);
      s.setBorder(mMini , mMax);
      mSoundList.add(s);
    }
  }

  /**
   * 生成波浪的
   */
  private void wave(){
    // TODO 防止UI抽風(fēng)
  }

  /**
   * 生成有序的
   */
  private void order(){
    // TODO 防止UI抽風(fēng)
  }
}

/**
 * 語音音頻波紋的單個(gè)音波屬性
 * Created by Mr.LongFace on 2017/9/16.
 */
public class SoundLine implements ValueAnimator.AnimatorUpdateListener{

  // 低 中 高 隨機(jī) 4擋
  public static final int SPEED_LOW = 500;
  public static final int SPEED_MID = 200;
  public static final int SPEED_HEI = 0;
  public static final int SPEED_RAN = 0;

  private Random mRandom;
  private ValueAnimator mAnim;

  public int left , right , top , bottom;
  private int min , max;

  public SoundLine(int left , int right , int top , int bottom){
    this.left = left;
    this.right = right;
    this.top = top;
    this.bottom = bottom;
    mRandom = new Random();
    initAnim();
  }

  private void initAnim() {
    mAnim = ValueAnimator.ofFloat(0.0f , 1.0f);
    setMode(SPEED_MID);
    mAnim.setRepeatCount(-1);
    mAnim.setRepeatMode(ValueAnimator.REVERSE);
    mAnim.addUpdateListener(this);
  }

  public void setMode(int mode){
    if (mode == SPEED_RAN) {
      mode = mRandom.nextInt(400);
    }
    mAnim.setDuration(300 + mode);
  }

  public void start(){
    if (mAnim.isRunning()){
      mAnim.end();
    }
    mAnim.start();
  }

  @Override
  public void onAnimationUpdate(ValueAnimator valueAnimator) {
    float f = (float) valueAnimator.getAnimatedValue();
    top = (int) (f * (max - min) / 2);
    bottom = max - top;
  }

  public void setBorder(int min, int max) {
    this.min = min;
    this.max = max;
  }

  public void stop() {
    mAnim.end();
    mAnim.cancel();
  }
}