/*
 * 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.allapps.search;

import static android.view.View.MeasureSpec.EXACTLY;
import static android.view.View.MeasureSpec.getSize;
import static android.view.View.MeasureSpec.makeMeasureSpec;

import static com.android.launcher3.Utilities.prefixTextWithIcon;
import static com.android.launcher3.icons.IconNormalizer.ICON_VISIBLE_AREA_FACTOR;

import android.content.Context;
import android.graphics.Rect;
import android.text.Selection;
import android.text.SpannableStringBuilder;
import android.text.method.TextKeyListener;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup.MarginLayoutParams;

import com.android.launcher3.BaseDraggingActivity;
import com.android.launcher3.DeviceProfile;
import com.android.launcher3.ExtendedEditText;
import com.android.launcher3.Insettable;
import com.android.launcher3.R;
import com.android.launcher3.allapps.AllAppsContainerView;
import com.android.launcher3.allapps.AllAppsGridAdapter.AdapterItem;
import com.android.launcher3.allapps.AllAppsStore;
import com.android.launcher3.allapps.AlphabeticalAppsList;
import com.android.launcher3.allapps.SearchUiManager;
import com.android.launcher3.search.SearchCallback;

import java.util.ArrayList;

/**
 * Layout to contain the All-apps search UI.
 */
public class AppsSearchContainerLayout extends ExtendedEditText
        implements SearchUiManager, SearchCallback<AdapterItem>,
        AllAppsStore.OnUpdateListener, Insettable {

    private final BaseDraggingActivity mLauncher;
    private final AllAppsSearchBarController mSearchBarController;
    private final SpannableStringBuilder mSearchQueryBuilder;

    private AlphabeticalAppsList mApps;
    private AllAppsContainerView mAppsView;

    // The amount of pixels to shift down and overlap with the rest of the content.
    private final int mContentOverlap;

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

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

    public AppsSearchContainerLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        mLauncher = BaseDraggingActivity.fromContext(context);
        mSearchBarController = new AllAppsSearchBarController();

        mSearchQueryBuilder = new SpannableStringBuilder();
        Selection.setSelection(mSearchQueryBuilder, 0);
        setHint(prefixTextWithIcon(getContext(), R.drawable.ic_allapps_search, getHint()));

        mContentOverlap =
                getResources().getDimensionPixelSize(R.dimen.all_apps_search_bar_field_height) / 2;
    }

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        mAppsView.getAppsStore().addUpdateListener(this);
    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        mAppsView.getAppsStore().removeUpdateListener(this);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // Update the width to match the grid padding
        DeviceProfile dp = mLauncher.getDeviceProfile();
        int myRequestedWidth = getSize(widthMeasureSpec);
        int rowWidth = myRequestedWidth - mAppsView.getActiveRecyclerView().getPaddingLeft()
                - mAppsView.getActiveRecyclerView().getPaddingRight();

        int cellWidth = DeviceProfile.calculateCellWidth(rowWidth, dp.cellLayoutBorderSpacingPx,
                dp.numShownHotseatIcons);
        int iconVisibleSize = Math.round(ICON_VISIBLE_AREA_FACTOR * dp.iconSizePx);
        int iconPadding = cellWidth - iconVisibleSize;

        int myWidth = rowWidth - iconPadding + getPaddingLeft() + getPaddingRight();
        super.onMeasure(makeMeasureSpec(myWidth, EXACTLY), heightMeasureSpec);
    }

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

        // Shift the widget horizontally so that its centered in the parent (b/63428078)
        View parent = (View) getParent();
        int availableWidth = parent.getWidth() - parent.getPaddingLeft() - parent.getPaddingRight();
        int myWidth = right - left;
        int expectedLeft = parent.getPaddingLeft() + (availableWidth - myWidth) / 2;
        int shift = expectedLeft - left;
        setTranslationX(shift);

        offsetTopAndBottom(mContentOverlap);
    }

    @Override
    public void initializeSearch(AllAppsContainerView appsView) {
        mApps = appsView.getApps();
        mAppsView = appsView;
        mSearchBarController.initialize(
                new DefaultAppSearchAlgorithm(mLauncher),
                this, mLauncher, this);
    }

    @Override
    public void onAppsUpdated() {
        mSearchBarController.refreshSearchResult();
    }

    @Override
    public void resetSearch() {
        mSearchBarController.reset();
    }

    @Override
    public void preDispatchKeyEvent(KeyEvent event) {
        // Determine if the key event was actual text, if so, focus the search bar and then dispatch
        // the key normally so that it can process this key event
        if (!mSearchBarController.isSearchFieldFocused() &&
                event.getAction() == KeyEvent.ACTION_DOWN) {
            final int unicodeChar = event.getUnicodeChar();
            final boolean isKeyNotWhitespace = unicodeChar > 0 &&
                    !Character.isWhitespace(unicodeChar) && !Character.isSpaceChar(unicodeChar);
            if (isKeyNotWhitespace) {
                boolean gotKey = TextKeyListener.getInstance().onKeyDown(this, mSearchQueryBuilder,
                        event.getKeyCode(), event);
                if (gotKey && mSearchQueryBuilder.length() > 0) {
                    mSearchBarController.focusSearchField();
                }
            }
        }
    }

    @Override
    public void onSearchResult(String query, ArrayList<AdapterItem> items) {
        if (items != null) {
            mApps.setSearchResults(items);
            notifyResultChanged();
            mAppsView.setLastSearchQuery(query);
        }
    }

    @Override
    public void onAppendSearchResult(String query, ArrayList<AdapterItem> items) {
        if (items != null) {
            mApps.appendSearchResults(items);
            notifyResultChanged();
        }
    }

    @Override
    public void clearSearchResult() {
        if (mApps.setSearchResults(null)) {
            notifyResultChanged();
        }

        // Clear the search query
        mSearchQueryBuilder.clear();
        mSearchQueryBuilder.clearSpans();
        Selection.setSelection(mSearchQueryBuilder, 0);
        mAppsView.onClearSearchResult();
    }

    private void notifyResultChanged() {
        mAppsView.onSearchResultsChanged();
    }

    @Override
    public void setInsets(Rect insets) {
        MarginLayoutParams mlp = (MarginLayoutParams) getLayoutParams();
        mlp.topMargin = insets.top;
        requestLayout();
    }

    @Override
    public ExtendedEditText getEditText() {
        return this;
    }
}