/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.systemui.statusbar;

import android.content.Context;
import android.content.res.Configuration;
import android.graphics.Canvas;
import android.os.SystemClock;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.FrameLayout;

import com.android.systemui.R;

public class StatusBarView extends FrameLayout {
    private static final String TAG = "StatusBarView";

    static final int DIM_ANIM_TIME = 400;
    
    StatusBarService mService;
    boolean mTracking;
    int mStartX, mStartY;
    ViewGroup mNotificationIcons;
    ViewGroup mStatusIcons;
    View mDate;
    FixedSizeDrawable mBackground;
    
    boolean mNightMode = false;
    int mStartAlpha = 0, mEndAlpha = 0;
    long mEndTime = 0;

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

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        mNotificationIcons = (ViewGroup)findViewById(R.id.notificationIcons);
        mStatusIcons = (ViewGroup)findViewById(R.id.statusIcons);
        mDate = findViewById(R.id.date);

        mBackground = new FixedSizeDrawable(mDate.getBackground());
        mBackground.setFixedBounds(0, 0, 0, 0);
        mDate.setBackgroundDrawable(mBackground);
    }

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        mService.onBarViewAttached();
    }
    
    @Override
    protected void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        boolean nightMode = (newConfig.uiMode & Configuration.UI_MODE_NIGHT_MASK)
                == Configuration.UI_MODE_NIGHT_YES;
        if (mNightMode != nightMode) {
            mNightMode = nightMode;
            mStartAlpha = getCurAlpha();
            mEndAlpha = mNightMode ? 0x80 : 0x00;
            mEndTime = SystemClock.uptimeMillis() + DIM_ANIM_TIME;
            invalidate();
        }
    }

    int getCurAlpha() {
        long time = SystemClock.uptimeMillis();
        if (time > mEndTime) {
            return mEndAlpha;
        }
        return mEndAlpha
                - (int)(((mEndAlpha-mStartAlpha) * (mEndTime-time) / DIM_ANIM_TIME));
    }
    
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        mService.updateExpandedViewPos(StatusBarService.EXPANDED_LEAVE_ALONE);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);

        // put the date date view quantized to the icons
        int oldDateRight = mDate.getRight();
        int newDateRight;

        newDateRight = getDateSize(mNotificationIcons, oldDateRight,
                getViewOffset(mNotificationIcons));
        if (newDateRight < 0) {
            int offset = getViewOffset(mStatusIcons);
            if (oldDateRight < offset) {
                newDateRight = oldDateRight;
            } else {
                newDateRight = getDateSize(mStatusIcons, oldDateRight, offset);
                if (newDateRight < 0) {
                    newDateRight = r;
                }
            }
        }
        int max = r - getPaddingRight();
        if (newDateRight > max) {
            newDateRight = max;
        }

        mDate.layout(mDate.getLeft(), mDate.getTop(), newDateRight, mDate.getBottom());
        mBackground.setFixedBounds(-mDate.getLeft(), -mDate.getTop(), (r-l), (b-t));
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        super.dispatchDraw(canvas);
        int alpha = getCurAlpha();
        if (alpha != 0) {
            canvas.drawARGB(alpha, 0, 0, 0);
        }
        if (alpha != mEndAlpha) {
            invalidate();
        }
    }

    /**
     * Gets the left position of v in this view.  Throws if v is not
     * a child of this.
     */
    private int getViewOffset(View v) {
        int offset = 0;
        while (v != this) {
            offset += v.getLeft();
            ViewParent p = v.getParent();
            if (v instanceof View) {
                v = (View)p;
            } else {
                throw new RuntimeException(v + " is not a child of " + this);
            }
        }
        return offset;
    }

    private int getDateSize(ViewGroup g, int w, int offset) {
        final int N = g.getChildCount();
        for (int i=0; i<N; i++) {
            View v = g.getChildAt(i);
            int l = v.getLeft() + offset;
            int r = v.getRight() + offset;
            if (w >= l && w <= r) {
                return r;
            }
        }
        return -1;
    }

    /**
     * Ensure that, if there is no target under us to receive the touch,
     * that we process it ourself.  This makes sure that onInterceptTouchEvent()
     * is always called for the entire gesture.
     */
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() != MotionEvent.ACTION_DOWN) {
            mService.interceptTouchEvent(event);
        }
        return true;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        return mService.interceptTouchEvent(event)
                ? true : super.onInterceptTouchEvent(event);
    }
}