/*
 * Copyright (C) 2014 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.qs;

import android.content.Context;
import android.graphics.Point;
import android.util.AttributeSet;
import android.view.View;
import android.widget.FrameLayout;

import com.android.systemui.R;
import com.android.systemui.qs.customize.QSCustomizer;

/**
 * Wrapper view with background which contains {@link QSPanel} and {@link BaseStatusBarHeader}
 */
public class QSContainerImpl extends FrameLayout {

    private final Point mSizePoint = new Point();

    private int mHeightOverride = -1;
    protected View mQSPanel;
    private View mQSDetail;
    protected View mHeader;
    protected float mQsExpansion;
    private QSCustomizer mQSCustomizer;
    private QSFooter mQSFooter;
    private int mGutterHeight;
    private View mBackground;
    private float mFullElevation;

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

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        mQSPanel = findViewById(R.id.quick_settings_panel);
        mQSDetail = findViewById(R.id.qs_detail);
        mHeader = findViewById(R.id.header);
        mQSCustomizer = findViewById(R.id.qs_customize);
        mQSFooter = findViewById(R.id.qs_footer);
        mBackground = findViewById(R.id.qs_background);
        mGutterHeight = getContext().getResources().getDimensionPixelSize(R.dimen.qs_gutter_height);
        mFullElevation = mQSPanel.getElevation();

        setClickable(true);
        setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_NO);
    }

    @Override
    public boolean performClick() {
        // Want to receive clicks so missing QQS tiles doesn't cause collapse, but
        // don't want to do anything with them.
        return true;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // Since we control our own bottom, be whatever size we want.
        // Otherwise the QSPanel ends up with 0 height when the window is only the
        // size of the status bar.
        mQSPanel.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(
                MeasureSpec.getSize(heightMeasureSpec), MeasureSpec.UNSPECIFIED));
        int width = mQSPanel.getMeasuredWidth();
        LayoutParams layoutParams = (LayoutParams) mQSPanel.getLayoutParams();
        int height = layoutParams.topMargin + layoutParams.bottomMargin
                + mQSPanel.getMeasuredHeight();
        super.onMeasure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
                MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));

        // QSCustomizer will always be the height of the screen, but do this after
        // other measuring to avoid changing the height of the QS.
        getDisplay().getRealSize(mSizePoint);
        mQSCustomizer.measure(widthMeasureSpec,
                MeasureSpec.makeMeasureSpec(mSizePoint.y, MeasureSpec.EXACTLY));
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        updateExpansion();
    }

    /**
     * Overrides the height of this view (post-layout), so that the content is clipped to that
     * height and the background is set to that height.
     *
     * @param heightOverride the overridden height
     */
    public void setHeightOverride(int heightOverride) {
        mHeightOverride = heightOverride;
        updateExpansion();
    }

    public void updateExpansion() {
        int height = calculateContainerHeight();
        int gutterHeight = Math.round(mQsExpansion * mGutterHeight);
        setBottom(getTop() + height + gutterHeight);
        mQSDetail.setBottom(getTop() + height);
        mBackground.setBottom(getTop() + height);
        // Pin QS Footer to the bottom of the panel.
        mQSFooter.setTranslationY(height - mQSFooter.getHeight());

        float elevation = mQsExpansion * mFullElevation;
        mQSDetail.setElevation(elevation);
        mBackground.setElevation(elevation);
        mQSFooter.setElevation(elevation);
        mQSPanel.setElevation(elevation);
    }

    protected int calculateContainerHeight() {
        int heightOverride = mHeightOverride != -1 ? mHeightOverride : getMeasuredHeight();
        return mQSCustomizer.isCustomizing() ? mQSCustomizer.getHeight()
                : Math.round(mQsExpansion * (heightOverride - mHeader.getHeight()))
                + mHeader.getHeight();
    }

    public void setExpansion(float expansion) {
        mQsExpansion = expansion;
        updateExpansion();
    }

    public void setGutterEnabled(boolean gutterEnabled) {
        if (gutterEnabled == (mGutterHeight != 0)) {
            return;
        }
        if (gutterEnabled) {
            mGutterHeight = getContext().getResources().getDimensionPixelSize(
                    R.dimen.qs_gutter_height);
        } else {
            mGutterHeight = 0;
        }
        updateExpansion();
    }
}