package fr.castorflex.android.smoothprogressbar;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;

/**
 * This is a copy of the ContentLoadingProgressBar from the support library, but extends
 * SmoothProgressBar.
 */
public class ContentLoadingSmoothProgressBar extends SmoothProgressBar {

    private static final int MIN_SHOW_TIME = 500; // ms
    private static final int MIN_DELAY = 500; // ms

    private long mStartTime = -1;

    private boolean mPostedHide = false;
    private final Runnable mDelayedHide = new Runnable() {

        @Override
        public void run() {
            mPostedHide = false;
            mStartTime = -1;
            setVisibility(View.GONE);
        }
    };
    private boolean mPostedShow = false;
    private boolean mDismissed = false;
    private final Runnable mDelayedShow = new Runnable() {

        @Override
        public void run() {
            mPostedShow = false;
            if (!mDismissed) {
                mStartTime = System.currentTimeMillis();
                setVisibility(View.VISIBLE);
            }
        }
    };

    public ContentLoadingSmoothProgressBar(Context context) {
        this(context, null);
    }

    public ContentLoadingSmoothProgressBar(Context context, AttributeSet attrs) {
        super(context, attrs, 0);
    }

    @Override
    public void onAttachedToWindow() {
        super.onAttachedToWindow();
        removeCallbacks();
    }

    @Override
    public void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        removeCallbacks();
    }

    private void removeCallbacks() {
        removeCallbacks(mDelayedHide);
        removeCallbacks(mDelayedShow);
    }

    /**
     * Hide the progress view if it is visible. The progress view will not be
     * hidden until it has been shown for at least a minimum show time. If the
     * progress view was not yet visible, cancels showing the progress view.
     */
    public void hide() {
        mDismissed = true;
        removeCallbacks(mDelayedShow);
        long diff = System.currentTimeMillis() - mStartTime;
        if (diff >= MIN_SHOW_TIME || mStartTime == -1) {
            // The progress spinner has been shown long enough
            // OR was not shown yet. If it wasn't shown yet,
            // it will just never be shown.
            setVisibility(View.GONE);
        } else {
            // The progress spinner is shown, but not long enough,
            // so put a delayed message in to hide it when its been
            // shown long enough.
            if (!mPostedHide) {
                postDelayed(mDelayedHide, MIN_SHOW_TIME - diff);
                mPostedHide = true;
            }
        }
    }

    /**
     * Show the progress view after waiting for a minimum delay. If
     * during that time, hide() is called, the view is never made visible.
     */
    public void show() {
        // Reset the start time.
        mStartTime = -1;
        mDismissed = false;
        removeCallbacks(mDelayedHide);
        if (!mPostedShow) {
            postDelayed(mDelayedShow, MIN_DELAY);
            mPostedShow = true;
        }
    }
}
