/*
 * Copyright (C) 2017 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.launcher3.widget;

import static com.android.launcher3.anim.Interpolators.FAST_OUT_SLOW_IN;

import android.animation.PropertyValuesHolder;
import android.content.Context;
import android.content.res.Configuration;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.IntProperty;
import android.util.Pair;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Interpolator;
import android.widget.ScrollView;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;

import com.android.launcher3.DeviceProfile;
import com.android.launcher3.Insettable;
import com.android.launcher3.LauncherAppState;
import com.android.launcher3.R;
import com.android.launcher3.anim.PendingAnimation;
import com.android.launcher3.model.WidgetItem;
import com.android.launcher3.model.data.ItemInfo;
import com.android.launcher3.util.PackageUserKey;
import com.android.launcher3.widget.util.WidgetsTableUtils;

import java.util.List;

/**
 * Bottom sheet for the "Widgets" system shortcut in the long-press popup.
 */
public class WidgetsBottomSheet extends BaseWidgetSheet implements Insettable {

    private static final IntProperty<View> PADDING_BOTTOM =
            new IntProperty<View>("paddingBottom") {
                @Override
                public void setValue(View view, int paddingBottom) {
                    view.setPadding(view.getPaddingLeft(), view.getPaddingTop(),
                            view.getPaddingRight(), paddingBottom);
                }

                @Override
                public Integer get(View view) {
                    return view.getPaddingBottom();
                }
            };

    private static final int DEFAULT_CLOSE_DURATION = 200;
    private static final long EDUCATION_TIP_DELAY_MS = 300;

    private ItemInfo mOriginalItemInfo;
    private Rect mInsets;
    private final int mMaxTableHeight;
    private int mMaxHorizontalSpan = 4;
    private Configuration mCurrentConfiguration;

    private final OnLayoutChangeListener mLayoutChangeListenerToShowTips =
            new OnLayoutChangeListener() {
                @Override
                public void onLayoutChange(View v, int left, int top, int right, int bottom,
                        int oldLeft, int oldTop, int oldRight, int oldBottom) {
                    if (hasSeenEducationTip()) {
                        removeOnLayoutChangeListener(this);
                        return;
                    }
                    // Widgets are loaded asynchronously, We are adding a delay because we only want
                    // to show the tip when the widget preview has finished loading and rendering in
                    // this view.
                    removeCallbacks(mShowEducationTipTask);
                    postDelayed(mShowEducationTipTask, EDUCATION_TIP_DELAY_MS);
                }
            };

    private final Runnable mShowEducationTipTask = () -> {
        if (hasSeenEducationTip()) {
            removeOnLayoutChangeListener(mLayoutChangeListenerToShowTips);
            return;
        }
        View viewForTip = ((ViewGroup) ((TableLayout) findViewById(R.id.widgets_table))
                                    .getChildAt(0)).getChildAt(0);
        if (showEducationTipOnViewIfPossible(viewForTip) != null) {
            removeOnLayoutChangeListener(mLayoutChangeListenerToShowTips);
        }
    };

    public WidgetsBottomSheet(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public WidgetsBottomSheet(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        setWillNotDraw(false);
        mInsets = new Rect();
        mContent = this;
        DeviceProfile deviceProfile = mActivityContext.getDeviceProfile();
        // Set the max table height to 2 / 3 of the grid height so that the bottom picker won't
        // take over the entire view vertically.
        mMaxTableHeight = deviceProfile.inv.numRows * 2 / 3  * deviceProfile.cellHeightPx;
        mCurrentConfiguration = new Configuration(getResources().getConfiguration());
        if (!hasSeenEducationTip()) {
            addOnLayoutChangeListener(mLayoutChangeListenerToShowTips);
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        int paddingPx = 2 * getResources().getDimensionPixelOffset(
                R.dimen.widget_cell_horizontal_padding);
        int maxHorizontalSpan = findViewById(R.id.widgets_table).getMeasuredWidth()
                / (mActivityContext.getDeviceProfile().cellWidthPx + paddingPx);

        if (mMaxHorizontalSpan != maxHorizontalSpan) {
            // Ensure the table layout is showing widgets in the right column after measure.
            mMaxHorizontalSpan = maxHorizontalSpan;
            onWidgetsBound();
        }
    }

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

        // Ensure the scroll view height is not larger than mMaxTableHeight, which is a value
        // smaller than the entire screen height.
        ScrollView widgetsTableScrollView = findViewById(R.id.widgets_table_scroll_view);
        if (widgetsTableScrollView.getMeasuredHeight() > mMaxTableHeight) {
            ViewGroup.LayoutParams layoutParams = widgetsTableScrollView.getLayoutParams();
            layoutParams.height = mMaxTableHeight;
            widgetsTableScrollView.setLayoutParams(layoutParams);
            findViewById(R.id.collapse_handle).setVisibility(VISIBLE);
        }
    }

    public void populateAndShow(ItemInfo itemInfo) {
        mOriginalItemInfo = itemInfo;
        ((TextView) findViewById(R.id.title)).setText(mOriginalItemInfo.title);

        onWidgetsBound();
        attachToContainer();
        mIsOpen = false;
        animateOpen();
    }

    @Override
    public void onWidgetsBound() {
        List<WidgetItem> widgets = mActivityContext.getPopupDataProvider().getWidgetsForPackageUser(
                new PackageUserKey(
                        mOriginalItemInfo.getTargetComponent().getPackageName(),
                        mOriginalItemInfo.user));

        TableLayout widgetsTable = findViewById(R.id.widgets_table);
        widgetsTable.removeAllViews();

        WidgetsTableUtils.groupWidgetItemsIntoTable(widgets, mMaxHorizontalSpan).forEach(row -> {
            TableRow tableRow = new TableRow(getContext());
            tableRow.setGravity(Gravity.TOP);
            row.forEach(widgetItem -> {
                WidgetCell widget = addItemCell(tableRow);
                widget.setPreviewSize(widgetItem.spanX, widgetItem.spanY);
                widget.applyFromCellItem(widgetItem, LauncherAppState.getInstance(mActivityContext)
                        .getWidgetCache());
                widget.ensurePreview();
                widget.setVisibility(View.VISIBLE);
            });
            widgetsTable.addView(tableRow);
        });
    }

    @Override
    public boolean onControllerInterceptTouchEvent(MotionEvent ev) {
        if (ev.getAction() == MotionEvent.ACTION_DOWN) {
            mNoIntercept = false;
            ScrollView scrollView = findViewById(R.id.widgets_table_scroll_view);
            if (getPopupContainer().isEventOverView(scrollView, ev)
                    && scrollView.getScrollY() > 0) {
                mNoIntercept = true;
            }
        }
        return super.onControllerInterceptTouchEvent(ev);
    }

    protected WidgetCell addItemCell(ViewGroup parent) {
        WidgetCell widget = (WidgetCell) LayoutInflater.from(getContext())
                .inflate(R.layout.widget_cell, parent, false);

        View previewContainer = widget.findViewById(R.id.widget_preview_container);
        previewContainer.setOnClickListener(this);
        previewContainer.setOnLongClickListener(this);
        widget.setAnimatePreview(false);

        parent.addView(widget);
        return widget;
    }

    private void animateOpen() {
        if (mIsOpen || mOpenCloseAnimator.isRunning()) {
            return;
        }
        mIsOpen = true;
        setupNavBarColor();
        mOpenCloseAnimator.setValues(
                PropertyValuesHolder.ofFloat(TRANSLATION_SHIFT, TRANSLATION_SHIFT_OPENED));
        mOpenCloseAnimator.setInterpolator(FAST_OUT_SLOW_IN);
        mOpenCloseAnimator.start();
    }

    @Override
    protected void handleClose(boolean animate) {
        handleClose(animate, DEFAULT_CLOSE_DURATION);
    }

    @Override
    protected boolean isOfType(@FloatingViewType int type) {
        return (type & TYPE_WIDGETS_BOTTOM_SHEET) != 0;
    }

    @Override
    public void setInsets(Rect insets) {
        // Extend behind left, right, and bottom insets.
        int leftInset = insets.left - mInsets.left;
        int rightInset = insets.right - mInsets.right;
        int bottomInset = insets.bottom - mInsets.bottom;
        mInsets.set(insets);
        setPadding(leftInset, getPaddingTop(), rightInset, bottomInset);
    }

    @Override
    protected void onConfigurationChanged(Configuration newConfig) {
        if (mCurrentConfiguration.orientation != newConfig.orientation) {
            mInsets.setEmpty();
        }
        mCurrentConfiguration.updateFrom(newConfig);
    }

    @Override
    protected Pair<View, String> getAccessibilityTarget() {
        return Pair.create(findViewById(R.id.title),  getContext().getString(
                mIsOpen ? R.string.widgets_list : R.string.widgets_list_closed));
    }

    @Override
    public void addHintCloseAnim(
            float distanceToMove, Interpolator interpolator, PendingAnimation target) {
        target.setInt(this, PADDING_BOTTOM, (int) (distanceToMove + mInsets.bottom), interpolator);
    }
}