/*
 * Copyright (C) 2024 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 android.graphics.pdf.models;

import android.annotation.FlaggedApi;
import android.annotation.NonNull;
import android.graphics.RectF;
import android.graphics.pdf.flags.Flags;
import android.graphics.pdf.utils.Preconditions;
import android.os.Parcel;
import android.os.Parcelable;

import java.util.List;

/**
 * Represents the bounds of a single search match on a page of the PDF document.
 */
@FlaggedApi(Flags.FLAG_ENABLE_PDF_VIEWER)
public final class PageMatchBounds implements Parcelable {
    @NonNull
    public static final Creator<PageMatchBounds> CREATOR = new Creator<PageMatchBounds>() {
        @Override
        public PageMatchBounds createFromParcel(Parcel in) {
            return new PageMatchBounds(in);
        }

        @Override
        public PageMatchBounds[] newArray(int size) {
            return new PageMatchBounds[size];
        }
    };
    private final List<RectF> mBounds;
    private final int mTextStartIndex;

    /**
     * Creates a new instance of {@link PageMatchBounds} for the text match found on the page. The
     * match is represented by bounds of the text match and the starting index of the character
     * "stream" (0-based index).
     *
     * @param bounds         Bounds of the text match.
     * @param textStartIndex starting index of the text match.
     * @throws NullPointerException     If bounds if null.
     * @throws IllegalArgumentException If bounds list is empty or if the text starting index is
     *                                  negative.
     */
    public PageMatchBounds(@NonNull List<RectF> bounds, int textStartIndex) {
        Preconditions.checkNotNull(bounds, "Bounds cannot be null");
        Preconditions.checkArgument(!bounds.isEmpty(), "Match bounds cannot be empty");
        Preconditions.checkArgument(textStartIndex >= 0, "Index cannot be negative");
        this.mBounds = bounds;
        this.mTextStartIndex = textStartIndex;
    }

    private PageMatchBounds(Parcel in) {
        mBounds = in.createTypedArrayList(RectF.CREATOR);
        mTextStartIndex = in.readInt();
    }

    /**
     * <p>
     * Represents the {@link RectF} bounds of a match. Matches which are spread across multiple
     * lines will be represented by multiple {@link RectF} in order of viewing.
     * <p><strong>Note:</strong> The bounds only represent the coordinates of the bounds of a
     * single line using {@link RectF}. The developer will need to render the highlighter as well
     * as
     * intercept the touch events for any additional UI interactions.
     *
     * @return list of bounds for the match on the page.
     */
    @NonNull
    public List<RectF> getBounds() {
        return mBounds;
    }

    /**
     * Gets the starting index of the match found on the page. Characters in a page form a "stream"
     * and inside the stream, each character has an index starting from 0.
     *
     * @return the starting index of the match on the page.
     */
    public int getTextStartIndex() {
        return mTextStartIndex;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(@androidx.annotation.NonNull Parcel dest, int flags) {
        dest.writeTypedList(mBounds);
        dest.writeInt(mTextStartIndex);
    }
}