/*
 * Copyright 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.tv.twopanelsettings.slices.compat.widget;

import static android.app.slice.Slice.HINT_ACTIONS;
import static android.app.slice.Slice.HINT_KEYWORDS;
import static android.app.slice.Slice.HINT_LAST_UPDATED;
import static android.app.slice.Slice.HINT_SEE_MORE;
import static android.app.slice.Slice.HINT_SHORTCUT;
import static android.app.slice.Slice.HINT_TITLE;
import static android.app.slice.Slice.HINT_TTL;
import static android.app.slice.Slice.SUBTYPE_CONTENT_DESCRIPTION;
import static android.app.slice.SliceItem.FORMAT_ACTION;
import static android.app.slice.SliceItem.FORMAT_IMAGE;
import static android.app.slice.SliceItem.FORMAT_LONG;
import static android.app.slice.SliceItem.FORMAT_SLICE;
import static android.app.slice.SliceItem.FORMAT_TEXT;
import static com.android.tv.twopanelsettings.slices.compat.core.SliceHints.HINT_OVERLAY;
import static com.android.tv.twopanelsettings.slices.compat.core.SliceHints.SUBTYPE_DATE_PICKER;
import static com.android.tv.twopanelsettings.slices.compat.core.SliceHints.SUBTYPE_TIME_PICKER;
import static com.android.tv.twopanelsettings.slices.compat.core.SliceHints.UNKNOWN_IMAGE;

import android.content.Context;
import android.graphics.Point;
import android.graphics.drawable.Drawable;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.graphics.drawable.IconCompat;
import com.android.tv.twopanelsettings.slices.compat.SliceItem;
import com.android.tv.twopanelsettings.slices.compat.SliceUtils;
import com.android.tv.twopanelsettings.slices.compat.core.SliceAction;
import com.android.tv.twopanelsettings.slices.compat.core.SliceActionImpl;
import com.android.tv.twopanelsettings.slices.compat.core.SliceQuery;
import java.util.ArrayList;
import java.util.List;

/**
 * Extracts information required to present content in a grid format from a slice.
 *
 * <p>Slice framework has been deprecated, it will not receive any updates moving forward. If you
 * are looking for a framework that handles communication across apps, consider using {@link
 * android.app.appsearch.AppSearchManager}.
 */
// @Deprecated // Supported for TV
public class GridContent extends SliceContent {

  private boolean mAllImages;
  private SliceItem mPrimaryAction;
  private final ArrayList<CellContent> mGridContent = new ArrayList<>();
  private SliceItem mSeeMoreItem;
  private int mMaxCellLineCount;
  private int mLargestImageMode = UNKNOWN_IMAGE;
  private boolean mIsLastIndex;
  private IconCompat mFirstImage = null;
  private Point mFirstImageSize = null;

  private SliceItem mTitleItem;

  /** */
  // @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP_PREFIX)
  public GridContent(@NonNull SliceItem gridItem, int position) {
    super(gridItem, position);
    populate(gridItem);
  }

  /**
   * @return whether this grid has content that is valid to display.
   */
  private boolean populate(SliceItem gridItem) {
    mSeeMoreItem = SliceQuery.find(gridItem, null, HINT_SEE_MORE, null);
    if (mSeeMoreItem != null && FORMAT_SLICE.equals(mSeeMoreItem.getFormat())) {
      List<SliceItem> seeMoreItems = mSeeMoreItem.getSlice().getItems();
      if (seeMoreItems != null && !seeMoreItems.isEmpty()) {
        mSeeMoreItem = seeMoreItems.get(0);
      }
    }
    String[] hints = new String[] {HINT_SHORTCUT, HINT_TITLE};
    mPrimaryAction =
        SliceQuery.find(gridItem, FORMAT_SLICE, hints, new String[] {HINT_ACTIONS} /* nonHints */);
    mAllImages = true;
    if (FORMAT_SLICE.equals(gridItem.getFormat())) {
      List<SliceItem> items = gridItem.getSlice().getItems();
      items = filterAndProcessItems(items);
      for (int i = 0; i < items.size(); i++) {
        SliceItem item = items.get(i);
        if (!SUBTYPE_CONTENT_DESCRIPTION.equals(item.getSubType())) {
          CellContent cc = new CellContent(item);
          processContent(cc);
        }
      }
    } else {
      CellContent cc = new CellContent(gridItem);
      processContent(cc);
    }
    return isValid();
  }

  private void processContent(CellContent cc) {
    if (cc.isValid()) {
      if ((mTitleItem == null && cc.getTitleItem() != null)) {
        mTitleItem = cc.getTitleItem();
      }
      mGridContent.add(cc);
      if (!cc.isImageOnly()) {
        mAllImages = false;
      }
      mMaxCellLineCount = Math.max(mMaxCellLineCount, cc.getTextCount());
      if (mFirstImage == null && cc.hasImage()) {
        mFirstImage = cc.getImageIcon();
      }
      mLargestImageMode =
          mLargestImageMode == UNKNOWN_IMAGE
              ? cc.getImageMode()
              : Math.max(mLargestImageMode, cc.getImageMode());
    }
  }

  /**
   * @return the title of this grid row, if it exists.
   */
  // @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP_PREFIX)
  @Nullable
  public CharSequence getTitle() {
    if (mTitleItem != null) {
      return mTitleItem.getSanitizedText();
    } else if (mPrimaryAction != null) {
      return new SliceActionImpl(mPrimaryAction).getTitle();
    }
    return null;
  }

  /**
   * @return the list of cell content for this grid.
   */
  // @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP_PREFIX)
  @NonNull
  public ArrayList<CellContent> getGridContent() {
    return mGridContent;
  }

  /**
   * @return the content intent item for this grid.
   */
  // @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP_PREFIX)
  @Nullable
  public SliceItem getContentIntent() {
    return mPrimaryAction;
  }

  /**
   * @return the see more item to use when not all items in the grid can be displayed.
   */
  // @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP_PREFIX)
  @Nullable
  public SliceItem getSeeMoreItem() {
    return mSeeMoreItem;
  }

  /**
   * @return whether this grid has content that is valid to display.
   */
  @Override
  public boolean isValid() {
    return super.isValid() && !mGridContent.isEmpty();
  }

  /**
   * @return whether the contents of this grid is just images.
   */
  // @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP_PREFIX)
  public boolean isAllImages() {
    return mAllImages;
  }

  /**
   * @return the largest image size in this row, if there are images.
   */
  // @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP_PREFIX)
  public int getLargestImageMode() {
    return mLargestImageMode;
  }

  /**
   * @return the first image dimensions in this row, if there are images. If there are no images,
   *     return {-1, -1}.
   */
  @NonNull
  public Point getFirstImageSize(@NonNull Context context) {
    if (mFirstImage == null) {
      return new Point(-1, -1);
    }
    if (mFirstImageSize == null) {
      Drawable d = mFirstImage.loadDrawable(context);
      mFirstImageSize = new Point(d.getIntrinsicWidth(), d.getIntrinsicHeight());
    }
    return mFirstImageSize;
  }

  /** Filters non-cell items out of the list of items and finds content description. */
  private List<SliceItem> filterAndProcessItems(List<SliceItem> items) {

    List<SliceItem> filteredItems = new ArrayList<>();
    for (int i = 0; i < items.size(); i++) {
      SliceItem item = items.get(i);
      // TODO: This see more can be removed at release
      boolean containsSeeMore = SliceQuery.find(item, null, HINT_SEE_MORE, null) != null;
      boolean isNonCellContent =
          containsSeeMore
              || item.hasAnyHints(
                  HINT_SHORTCUT,
                  HINT_SEE_MORE,
                  HINT_KEYWORDS,
                  HINT_TTL,
                  HINT_LAST_UPDATED,
                  HINT_OVERLAY);
      if (SUBTYPE_CONTENT_DESCRIPTION.equals(item.getSubType())) {
        mContentDescr = item;
      } else if (!isNonCellContent) {
        filteredItems.add(item);
      }
    }
    return filteredItems;
  }

  /**
   * @return the max number of lines of text in the cells of this grid row.
   */
  // @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP_PREFIX)
  public int getMaxCellLineCount() {
    return mMaxCellLineCount;
  }

  /**
   * @return whether this row contains an image.
   */
  // @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP_PREFIX)
  public boolean hasImage() {
    return mFirstImage != null;
  }

  /**
   * @return whether this content is being displayed last in a list.
   */
  // @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP_PREFIX)
  public boolean getIsLastIndex() {
    return mIsLastIndex;
  }

  /** Sets whether this content is being displayed last in a list. */
  // @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP_PREFIX)
  public void setIsLastIndex(boolean isLast) {
    mIsLastIndex = isLast;
  }

  /** */
  // @RestrictTo(RestrictTo.Scope.LIBRARY)
  @Override
  public int getHeight(@NonNull SliceStyle style, @NonNull SliceViewPolicy policy) {
    return style.getGridHeight(this, policy);
  }

  /** Extracts information required to present content in a cell. */
  // @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP_PREFIX)
  public static class CellContent {
    private SliceItem mContentIntent;
    private SliceItem mPicker;
    private final ArrayList<SliceItem> mCellItems = new ArrayList<>();
    private SliceItem mContentDescr;
    private int mTextCount;
    private int mImageCount;
    private IconCompat mImage;
    private SliceItem mOverlayItem;
    private int mImageMode = -1;
    private SliceItem mTitleItem;
    private SliceItem mToggleItem;

    public CellContent(@NonNull SliceItem cellItem) {
      populate(cellItem);
    }

    /**
     * @return whether this row has content that is valid to display.
     */
    public boolean populate(@NonNull SliceItem cellItem) {
      final String format = cellItem.getFormat();
      if (!cellItem.hasHint(HINT_SHORTCUT)
          && (FORMAT_SLICE.equals(format) || FORMAT_ACTION.equals(format))) {
        List<SliceItem> items = cellItem.getSlice().getItems();
        List<SliceItem> sliceActionItems = null;

        // Fill the sliceActionItems with the first showing SliceAction in items.
        for (SliceItem item : items) {
          if ((FORMAT_ACTION.equals(item.getFormat()) || FORMAT_SLICE.equals(item.getFormat()))
              && !(SUBTYPE_DATE_PICKER.equals(item.getSubType())
                  || SUBTYPE_TIME_PICKER.equals(item.getSubType()))) {
            sliceActionItems = item.getSlice().getItems();
            SliceAction ac = new SliceActionImpl(item);
            if (ac.isToggle()) {
              mToggleItem = item;
            } else {
              mContentIntent = items.get(0);
            }
            break;
          }
        }
        if (FORMAT_ACTION.equals(format)) {
          mContentIntent = cellItem;
        }
        mTextCount = 0;
        mImageCount = 0;
        fillCellItems(items);

        if (mTextCount == 0 && mImageCount == 0 && sliceActionItems != null) {
          fillCellItems(sliceActionItems);
        }
      } else if (isValidCellContent(cellItem)) {
        mCellItems.add(cellItem);
      }
      return isValid();
    }

    private void fillCellItems(List<SliceItem> items) {
      for (int i = 0; i < items.size(); i++) {
        final SliceItem item = items.get(i);
        final String itemFormat = item.getFormat();
        if (mPicker == null
            && (SUBTYPE_DATE_PICKER.equals(item.getSubType())
                || SUBTYPE_TIME_PICKER.equals(item.getSubType()))) {
          mPicker = item;
        } else if (SUBTYPE_CONTENT_DESCRIPTION.equals(item.getSubType())) {
          mContentDescr = item;
        } else if (mTextCount < 2
            && (FORMAT_TEXT.equals(itemFormat) || FORMAT_LONG.equals(itemFormat))) {
          if (mTitleItem == null || (!mTitleItem.hasHint(HINT_TITLE) && item.hasHint(HINT_TITLE))) {
            mTitleItem = item;
          }
          if (item.hasHint(HINT_OVERLAY)) {
            if (mOverlayItem == null) {
              mOverlayItem = item;
            }
          } else {
            mTextCount++;
            mCellItems.add(item);
          }
        } else if (mImageCount < 1 && FORMAT_IMAGE.equals(item.getFormat())) {
          mImageMode = SliceUtils.parseImageMode(item);
          mImageCount++;
          mImage = item.getIcon();
          mCellItems.add(item);
        }
      }
    }

    /**
     * @return toggle slice item if this cell has one.
     */
    @Nullable
    public SliceItem getToggleItem() {
      return mToggleItem;
    }

    /**
     * @return title text slice item if this cell has one.
     */
    @Nullable
    public SliceItem getTitleItem() {
      return mTitleItem;
    }

    /**
     * @return image overlay text slice item if this cell has one.
     */
    @Nullable
    public SliceItem getOverlayItem() {
      return mOverlayItem;
    }

    /**
     * @return the action to activate when this cell is tapped.
     */
    @Nullable
    public SliceItem getContentIntent() {
      return mContentIntent;
    }

    /**
     * @return the Picker to use when this cell is tapped.
     */
    @Nullable
    public SliceItem getPicker() {
      return mPicker;
    }

    /**
     * @return the slice items to display in this cell.
     */
    @NonNull
    public ArrayList<SliceItem> getCellItems() {
      return mCellItems;
    }

    /**
     * @return whether this is content that is valid to show in a grid cell.
     */
    private boolean isValidCellContent(SliceItem cellItem) {
      final String format = cellItem.getFormat();
      boolean isNonCellContent =
          SUBTYPE_CONTENT_DESCRIPTION.equals(cellItem.getSubType())
              || cellItem.hasAnyHints(HINT_KEYWORDS, HINT_TTL, HINT_LAST_UPDATED);
      return !isNonCellContent
          && (FORMAT_TEXT.equals(format)
              || FORMAT_LONG.equals(format)
              || FORMAT_IMAGE.equals(format));
    }

    /**
     * @return whether this grid has content that is valid to display.
     */
    public boolean isValid() {
      return mPicker != null || (!mCellItems.isEmpty() && mCellItems.size() <= 3);
    }

    /**
     * @return whether this cell contains just an image.
     */
    public boolean isImageOnly() {
      return mCellItems.size() == 1 && FORMAT_IMAGE.equals(mCellItems.get(0).getFormat());
    }

    /**
     * @return number of text items in this cell.
     */
    public int getTextCount() {
      return mTextCount;
    }

    /**
     * @return whether this cell contains an image.
     */
    public boolean hasImage() {
      return mImage != null;
    }

    /**
     * @return the mode of the image.
     */
    public int getImageMode() {
      return mImageMode;
    }

    /**
     * @return the IconCompat of the image.
     */
    @Nullable
    public IconCompat getImageIcon() {
      return mImage;
    }

    @Nullable
    public CharSequence getContentDescription() {
      return mContentDescr != null ? mContentDescr.getText() : null;
    }
  }
}