/*
 * 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 static android.app.StatusBarManager.DISABLE2_QUICK_SETTINGS;
import static android.content.res.Configuration.ORIENTATION_LANDSCAPE;

import android.content.Context;
import android.content.res.Configuration;
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;
    private QSPanel mQSPanel;
    private View mQSDetail;
    private QuickStatusBarHeader mHeader;
    private float mQsExpansion;
    private QSCustomizer mQSCustomizer;
    private View mDragHandle;
    private View mQSPanelContainer;

    private View mBackground;
    private View mBackgroundGradient;
    private View mStatusBarBackground;

    private int mSideMargins;
    private boolean mQsDisabled;
    private int mContentPaddingStart = -1;
    private int mContentPaddingEnd = -1;

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

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        mQSPanel = findViewById(R.id.quick_settings_panel);
        mQSPanelContainer = findViewById(R.id.expanded_qs_scroll_view);
        mQSDetail = findViewById(R.id.qs_detail);
        mHeader = findViewById(R.id.header);
        mQSCustomizer = findViewById(R.id.qs_customize);
        mDragHandle = findViewById(R.id.qs_drag_handle_view);
        mBackground = findViewById(R.id.quick_settings_background);
        mStatusBarBackground = findViewById(R.id.quick_settings_status_bar_background);
        mBackgroundGradient = findViewById(R.id.quick_settings_gradient_view);
        updateResources();

        setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_NO);
    }

    @Override
    protected void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        setBackgroundGradientVisibility(newConfig);
        updateResources();
        mSizePoint.set(0, 0); // Will be retrieved on next measure pass.
    }

    @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) {
        // QSPanel will show as many rows as it can (up to TileLayout.MAX_ROWS) such that the
        // bottom and footer are inside the screen.
        Configuration config = getResources().getConfiguration();
        boolean navBelow = config.smallestScreenWidthDp >= 600
                || config.orientation != Configuration.ORIENTATION_LANDSCAPE;
        MarginLayoutParams layoutParams = (MarginLayoutParams) mQSPanelContainer.getLayoutParams();

        // The footer is pinned to the bottom of QSPanel (same bottoms), therefore we don't need to
        // subtract its height. We do not care if the collapsed notifications fit in the screen.
        int maxQs = getDisplayHeight() - layoutParams.topMargin - layoutParams.bottomMargin
                - getPaddingBottom();
        if (navBelow) {
            maxQs -= getResources().getDimensionPixelSize(R.dimen.navigation_bar_height);
        }

        int padding = mPaddingLeft + mPaddingRight + layoutParams.leftMargin
                + layoutParams.rightMargin;
        final int qsPanelWidthSpec = getChildMeasureSpec(widthMeasureSpec, padding,
                layoutParams.width);
        mQSPanelContainer.measure(qsPanelWidthSpec,
                MeasureSpec.makeMeasureSpec(maxQs, MeasureSpec.AT_MOST));
        int width = mQSPanelContainer.getMeasuredWidth() + padding;
        int height = layoutParams.topMargin + layoutParams.bottomMargin
                + mQSPanelContainer.getMeasuredHeight() + getPaddingBottom();
        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.
        mQSCustomizer.measure(widthMeasureSpec,
                MeasureSpec.makeMeasureSpec(getDisplayHeight(), MeasureSpec.EXACTLY));
    }


    @Override
    protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed,
            int parentHeightMeasureSpec, int heightUsed) {
        // Do not measure QSPanel again when doing super.onMeasure.
        // This prevents the pages in PagedTileLayout to be remeasured with a different (incorrect)
        // size to the one used for determining the number of rows and then the number of pages.
        if (child != mQSPanelContainer) {
            super.measureChildWithMargins(child, parentWidthMeasureSpec, widthUsed,
                    parentHeightMeasureSpec, heightUsed);
        }
    }

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

    public void disable(int state1, int state2, boolean animate) {
        final boolean disabled = (state2 & DISABLE2_QUICK_SETTINGS) != 0;
        if (disabled == mQsDisabled) return;
        mQsDisabled = disabled;
        setBackgroundGradientVisibility(getResources().getConfiguration());
        mBackground.setVisibility(mQsDisabled ? View.GONE : View.VISIBLE);
    }

    private void updateResources() {
        LayoutParams layoutParams = (LayoutParams) mQSPanelContainer.getLayoutParams();
        layoutParams.topMargin = mContext.getResources().getDimensionPixelSize(
                com.android.internal.R.dimen.quick_qs_offset_height);
        mQSPanelContainer.setLayoutParams(layoutParams);

        mSideMargins = getResources().getDimensionPixelSize(R.dimen.notification_side_paddings);
        mContentPaddingStart = getResources().getDimensionPixelSize(
                com.android.internal.R.dimen.notification_content_margin_start);
        int newPaddingEnd = getResources().getDimensionPixelSize(
                com.android.internal.R.dimen.notification_content_margin_end);
        boolean marginsChanged = newPaddingEnd != mContentPaddingEnd;
        mContentPaddingEnd = newPaddingEnd;
        if (marginsChanged) {
            updatePaddingsAndMargins();
        }
    }

    /**
     * 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();
        setBottom(getTop() + height);
        mQSDetail.setBottom(getTop() + height);
        // Pin the drag handle to the bottom of the panel.
        mDragHandle.setTranslationY(height - mDragHandle.getHeight());
        mBackground.setTop(mQSPanelContainer.getTop());
        mBackground.setBottom(height);
    }

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

    private void setBackgroundGradientVisibility(Configuration newConfig) {
        if (newConfig.orientation == ORIENTATION_LANDSCAPE) {
            mBackgroundGradient.setVisibility(View.INVISIBLE);
            mStatusBarBackground.setVisibility(View.INVISIBLE);
        } else {
            mBackgroundGradient.setVisibility(mQsDisabled ? View.INVISIBLE : View.VISIBLE);
            mStatusBarBackground.setVisibility(View.VISIBLE);
        }
    }

    public void setExpansion(float expansion) {
        mQsExpansion = expansion;
        mDragHandle.setAlpha(1.0f - expansion);
        updateExpansion();
    }

    private void updatePaddingsAndMargins() {
        for (int i = 0; i < getChildCount(); i++) {
            View view = getChildAt(i);
            if (view == mStatusBarBackground || view == mBackgroundGradient
                    || view == mQSCustomizer) {
                // Some views are always full width
                continue;
            }
            LayoutParams lp = (LayoutParams) view.getLayoutParams();
            lp.rightMargin = mSideMargins;
            lp.leftMargin = mSideMargins;
            if (view == mQSPanelContainer) {
                // QS panel lays out some of its content full width
                mQSPanel.setContentMargins(mContentPaddingStart, mContentPaddingEnd);
            } else if (view == mHeader) {
                // The header contains the QQS panel which needs to have special padding, to
                // visually align them.
                mHeader.setContentMargins(mContentPaddingStart, mContentPaddingEnd);
            } else {
                view.setPaddingRelative(
                        mContentPaddingStart,
                        view.getPaddingTop(),
                        mContentPaddingEnd,
                        view.getPaddingBottom());
            }
        }
    }

    private int getDisplayHeight() {
        if (mSizePoint.y == 0) {
            getDisplay().getRealSize(mSizePoint);
        }
        return mSizePoint.y;
    }
}