/*
 * Copyright (C) 2016 TIBCO Jaspersoft Corporation. All rights reserved.
 * http://community.jaspersoft.com/project/mobile-sdk-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 SDK for Android.
 *
 * TIBCO Jaspersoft Mobile SDK 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 3 of the License, or
 * (at your option) any later version.
 *
 * TIBCO Jaspersoft Mobile SDK 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 SDK for Android. If not, see
 * <http://www.gnu.org/licenses/lgpl>.
 */

package com.jaspersoft.android.sdk.service.rx.report;

import com.jaspersoft.android.sdk.service.data.report.ReportExportOutput;
import com.jaspersoft.android.sdk.service.exception.ServiceException;
import com.jaspersoft.android.sdk.service.report.ReportAttachment;
import com.jaspersoft.android.sdk.service.report.ReportExport;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.TestOnly;
import rx.Observable;
import rx.functions.Func0;

import java.util.ArrayList;
import java.util.List;

/**
 * Public API that wraps concrete export requested by user.
 * All responses wrapped as Rx {@link rx.Observable}.
 *
 * @author Tom Koptel
 * @since 2.3
 */
public class RxReportExport {
    private final ReportExport mSyncDelegate;

    @TestOnly
    RxReportExport(ReportExport export) {
        mSyncDelegate = export;
    }

    /**
     * List of available attachments related to particular export
     *
     * @return attachments list or empty collection
     */
    @NotNull
    public Observable<List<RxReportAttachment>> getAttachments() {
        return Observable.defer(new Func0<Observable<List<RxReportAttachment>>>() {
            @Override
            public Observable<List<RxReportAttachment>> call() {
                List<ReportAttachment> attachments = mSyncDelegate.getAttachments();
                int size = attachments.size();
                List<RxReportAttachment> rxAttachments = new ArrayList<>(size);
                for (int i = 0; i < size; i++) {
                    ReportAttachment attachment = attachments.get(i);
                    RxReportAttachment rxAttachment = new RxReportAttachment(attachment);
                    rxAttachments.add(rxAttachment);
                }
                return Observable.just(rxAttachments);
            }
        });
    }

    /**
     * Performs network operation that returns output of export
     *
     * @return output of export that wraps {@link java.io.InputStream}
     */
    @NotNull
    public Observable<ReportExportOutput> download() {
        return Observable.defer(new Func0<Observable<ReportExportOutput>>() {
            @Override
            public Observable<ReportExportOutput> call() {
                try {
                    ReportExportOutput content = mSyncDelegate.download();
                    return Observable.just(content);
                } catch (ServiceException e) {
                    return Observable.error(e);
                }
            }
        });
    }

    /**
     * Exposes internal id of report export execution session
     *
     * @return export execution id
     */
    public String getExportId() {
        return mSyncDelegate.getExportId();
    }

    /**
     * Provides synchronous counterpart of service
     *
     * @return wrapped version of service {@link ReportExport}
     */
    public ReportExport toBlocking() {
        return mSyncDelegate;
    }
}