/*
 * Copyright © 2016 TIBCO Software,Inc.All rights reserved.
 * http://community.jaspersoft.com/project/jaspermobile-android
 *
 * Unless you have purchased a commercial license agreement from TIBCO Jaspersoft,
 * the following license terms apply:
 *
 * This program is part of TIBCO Jaspersoft Mobile for Android.
 *
 * TIBCO Jaspersoft Mobile is free software:you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation,either version 3of the License,or
 * (at your option)any later version.
 *
 * TIBCO Jaspersoft Mobile is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY;without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with TIBCO Jaspersoft Mobile for Android.If not,see
 * <http://www.gnu.org/licenses/lgpl>.
 */

package com.jaspersoft.android.jaspermobile.util.print;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.print.PrintHelper;
import android.webkit.WebView;

import rx.Observable;
import rx.android.schedulers.AndroidSchedulers;
import rx.functions.Action1;
import rx.functions.Func0;
import rx.schedulers.Schedulers;

/**
 * @author Tom Koptel
 * @since 2.1
 */
public final class DashboardPicturePrintJob implements ResourcePrintJob {

    private final WebView webView;

    public DashboardPicturePrintJob(WebView webView) {
        if (webView == null) {
            throw new IllegalArgumentException("WebView should not be null");
        }
        this.webView = webView;
    }

    @NonNull
    @Override
    public ResourcePrintJob printResource(@NonNull Bundle args) {
        final String printName = args.getString(ResourcePrintJob.PRINT_NAME_KEY);

        getScreenShot()
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Action1<Bitmap>() {
                    @Override
                    public void call(Bitmap bitmap) {
                        PrintHelper printHelper = new PrintHelper(webView.getContext());
                        printHelper.setScaleMode(PrintHelper.SCALE_MODE_FIT);
                        printHelper.printBitmap(printName, bitmap);
                    }
                });
        return this;
    }

    private Observable<Bitmap> getScreenShot() {
        return Observable.defer(new Func0<Observable<Bitmap>>() {
            @Override
            public Observable<Bitmap> call() {
                return Observable.just(createBitmap());
            }
        });
    }

    private Bitmap createBitmap() {
        Bitmap bitmap = Bitmap.createBitmap(webView.getMeasuredWidth(), webView.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        webView.draw(canvas);
        return bitmap;
    }

}