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/*
 * This file is part of the PDF Split And Merge source code
 * Created on 30 ago 2019
 * Copyright 2019 by Sober Lemur S.r.l. ([email protected]).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 */
package org.pdfsam.gui.components.dnd;

import jakarta.inject.Inject;
import jakarta.inject.Provider;
import org.pdfsam.eventstudio.annotation.EventListener;
import org.pdfsam.gui.components.dialog.AddSubdirectoriesConfirmationDialog;
import org.pdfsam.injector.Auto;
import org.pdfsam.model.io.FileType;
import org.pdfsam.model.pdf.PdfDocumentDescriptor;
import org.pdfsam.model.pdf.PdfFilesListLoadRequest;
import org.pdfsam.model.pdf.PdfLoadRequest;
import org.pdfsam.model.ui.dnd.FilesDroppedEvent;
import org.pdfsam.ui.components.notification.AddNotificationRequest;
import org.pdfsam.ui.components.notification.NotificationType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.List;
import java.util.stream.Stream;

import static java.util.Arrays.stream;
import static org.pdfsam.core.context.ApplicationContext.app;
import static org.pdfsam.eventstudio.StaticStudio.eventStudio;
import static org.pdfsam.i18n.I18nContext.i18n;

/**
 * Controller responding to a files drop event
 *
 * @author Andrea Vacondio
 */
@Auto
public class FilesDropController {

    private static final Logger LOG = LoggerFactory.getLogger(FilesDropController.class);

    private final Provider dialog;

    @Inject
    public FilesDropController(Provider dialog) {
        this.dialog = dialog;
        eventStudio().addAnnotatedListeners(this);
    }

    @EventListener
    public void request(FilesDroppedEvent event) {
        if (event.acceptMultipleFiles()) {
            doRequestMultiple(event);
        } else {
            doRequestSingle(event);
        }
    }

    private void doRequestMultiple(FilesDroppedEvent event) {
        // not a PDF maybe a csv or txt containing the list
        if (event.files().size() == 1 && !event.files().get(0).isDirectory() && (
                FileType.TXT.matches(event.files().get(0).getName()) || FileType.CSV.matches(
                        event.files().get(0).getName()))) {
            var path = event.files().get(0).toPath();
            app().runtimeState().maybeWorkingPath(path);
            eventStudio().broadcast(new PdfFilesListLoadRequest(event.toolBinding(), path));
        } else {
            final var loadEvent = new PdfLoadRequest(event.toolBinding());
            getFiles(event.files()).filter(f -> FileType.PDF.matches(f.getName()))
                    .map(PdfDocumentDescriptor::newDescriptorNoPassword).forEach(loadEvent::add);
            if (!loadEvent.getDocuments().isEmpty()) {
                app().runtimeState().maybeWorkingPath(loadEvent.getDocuments().get(0).getFileName());
                eventStudio().broadcast(loadEvent, event.toolBinding());
            } else {
                eventStudio().broadcast(new AddNotificationRequest(NotificationType.WARN,
                        i18n().tr("Drag and drop PDF files or directories containing PDF files"),
                        i18n().tr("No PDF found")));
            }
        }
    }

    private Stream getFiles(List files) {
        if (files.size() == 1 && files.get(0).isDirectory()) {
            try {
                if (stream(files.get(0).listFiles()).anyMatch(File::isDirectory) && dialog.get().response()) {
                    return Files.walk(files.get(0).toPath()).filter(Files::isRegularFile).map(Path::toFile).sorted();
                }
            } catch (IOException e) {
                LOG.warn("Unable to retrieve the list of files from " + files.get(0), e);
            }
            return stream(files.get(0).listFiles()).sorted();
        }
        return files.stream();
    }

    public void doRequestSingle(FilesDroppedEvent event) {

        event.files().stream().filter(f -> FileType.PDF.matches(f.getName())).filter(File::isFile)
                .map(PdfDocumentDescriptor::newDescriptorNoPassword).findFirst().ifPresent(file -> {
                    var loadEvent = new PdfLoadRequest(event.toolBinding());
                    loadEvent.add(file);
                    eventStudio().broadcast(loadEvent, event.toolBinding());
                });
    }
}