// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.gui.io;

import static org.openstreetmap.josm.gui.help.HelpUtil.ht;
import static org.openstreetmap.josm.tools.CheckParameterUtil.ensureParameterNotNull;
import static org.openstreetmap.josm.tools.I18n.tr;
import static org.openstreetmap.josm.tools.I18n.trn;

import java.lang.reflect.InvocationTargetException;
import java.util.HashSet;
import java.util.Set;

import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.APIDataSet;
import org.openstreetmap.josm.data.osm.Changeset;
import org.openstreetmap.josm.data.osm.ChangesetCache;
import org.openstreetmap.josm.data.osm.IPrimitive;
import org.openstreetmap.josm.data.osm.Node;
import org.openstreetmap.josm.data.osm.OsmPrimitive;
import org.openstreetmap.josm.data.osm.Relation;
import org.openstreetmap.josm.data.osm.Way;
import org.openstreetmap.josm.gui.DefaultNameFormatter;
import org.openstreetmap.josm.gui.HelpAwareOptionPane;
import org.openstreetmap.josm.gui.HelpAwareOptionPane.ButtonSpec;
import org.openstreetmap.josm.gui.Notification;
import org.openstreetmap.josm.gui.layer.OsmDataLayer;
import org.openstreetmap.josm.gui.progress.ProgressMonitor;
import org.openstreetmap.josm.gui.util.GuiHelper;
import org.openstreetmap.josm.io.ChangesetClosedException;
import org.openstreetmap.josm.io.OsmApi;
import org.openstreetmap.josm.io.OsmApiPrimitiveGoneException;
import org.openstreetmap.josm.io.OsmServerWriter;
import org.openstreetmap.josm.io.OsmTransferCanceledException;
import org.openstreetmap.josm.io.OsmTransferException;
import org.openstreetmap.josm.tools.ImageProvider;

/**
 * The task for uploading a collection of primitives.
 *
 */
public class UploadPrimitivesTask extends AbstractUploadTask {
    private boolean uploadCanceled = false;
    private Exception lastException = null;
    private APIDataSet toUpload;
    private OsmServerWriter writer;
    private OsmDataLayer layer;
    private Changeset changeset;
    private Set<IPrimitive> processedPrimitives;
    private UploadStrategySpecification strategy;

    /**
     * Creates the task
     *
     * @param strategy the upload strategy. Must not be null.
     * @param layer  the OSM data layer for which data is uploaded. Must not be null.
     * @param toUpload the collection of primitives to upload. Set to the empty collection if null.
     * @param changeset the changeset to use for uploading. Must not be null. changeset.getId()
     * can be 0 in which case the upload task creates a new changeset
     * @throws IllegalArgumentException thrown if layer is null
     * @throws IllegalArgumentException thrown if toUpload is null
     * @throws IllegalArgumentException thrown if strategy is null
     * @throws IllegalArgumentException thrown if changeset is null
     */
    public UploadPrimitivesTask(UploadStrategySpecification strategy, OsmDataLayer layer, APIDataSet toUpload, Changeset changeset) {
        super(tr("Uploading data for layer ''{0}''", layer.getName()),false /* don't ignore exceptions */);
        ensureParameterNotNull(layer,"layer");
        ensureParameterNotNull(strategy, "strategy");
        ensureParameterNotNull(changeset, "changeset");
        this.toUpload = toUpload;
        this.layer = layer;
        this.changeset = changeset;
        this.strategy = strategy;
        this.processedPrimitives = new HashSet<>();
    }

    protected MaxChangesetSizeExceededPolicy askMaxChangesetSizeExceedsPolicy() {
        ButtonSpec[] specs = new ButtonSpec[] {
                new ButtonSpec(
                        tr("Continue uploading"),
                        ImageProvider.get("upload"),
                        tr("Click to continue uploading to additional new changesets"),
                        null /* no specific help text */
                ),
                new ButtonSpec(
                        tr("Go back to Upload Dialog"),
                        ImageProvider.get("dialogs", "uploadproperties"),
                        tr("Click to return to the Upload Dialog"),
                        null /* no specific help text */
                ),
                new ButtonSpec(
                        tr("Abort"),
                        ImageProvider.get("cancel"),
                        tr("Click to abort uploading"),
                        null /* no specific help text */
                )
        };
        int numObjectsToUploadLeft = toUpload.getSize() - processedPrimitives.size();
        String msg1 = tr("The server reported that the current changeset was closed.<br>"
                + "This is most likely because the changesets size exceeded the max. size<br>"
                + "of {0} objects on the server ''{1}''.",
                OsmApi.getOsmApi().getCapabilities().getMaxChangesetSize(),
                OsmApi.getOsmApi().getBaseUrl()
        );
        String msg2 = trn(
                "There is {0} object left to upload.",
                "There are {0} objects left to upload.",
                numObjectsToUploadLeft,
                numObjectsToUploadLeft
        );
        String msg3 = tr(
                "Click ''<strong>{0}</strong>'' to continue uploading to additional new changesets.<br>"
                + "Click ''<strong>{1}</strong>'' to return to the upload dialog.<br>"
                + "Click ''<strong>{2}</strong>'' to abort uploading and return to map editing.<br>",
                specs[0].text,
                specs[1].text,
                specs[2].text
        );
        String msg = "<html>" + msg1 + "<br><br>" + msg2 +"<br><br>" + msg3 + "</html>";
        int ret = HelpAwareOptionPane.showOptionDialog(
                Main.parent,
                msg,
                tr("Changeset is full"),
                JOptionPane.WARNING_MESSAGE,
                null, /* no special icon */
                specs,
                specs[0],
                ht("/Action/Upload#ChangesetFull")
        );
        switch(ret) {
        case 0: return MaxChangesetSizeExceededPolicy.AUTOMATICALLY_OPEN_NEW_CHANGESETS;
        case 1: return MaxChangesetSizeExceededPolicy.FILL_ONE_CHANGESET_AND_RETURN_TO_UPLOAD_DIALOG;
        case 2: return MaxChangesetSizeExceededPolicy.ABORT;
        case JOptionPane.CLOSED_OPTION: return MaxChangesetSizeExceededPolicy.ABORT;
        }
        // should not happen
        return null;
    }

    protected void openNewChangeset() {
        // make sure the current changeset is removed from the upload dialog.
        //
        ChangesetCache.getInstance().update(changeset);
        Changeset newChangeSet = new Changeset();
        newChangeSet.setKeys(this.changeset.getKeys());
        this.changeset = newChangeSet;
    }

    protected boolean recoverFromChangesetFullException() {
        if (toUpload.getSize() - processedPrimitives.size() == 0) {
            strategy.setPolicy(MaxChangesetSizeExceededPolicy.ABORT);
            return false;
        }
        if (strategy.getPolicy() == null || strategy.getPolicy().equals(MaxChangesetSizeExceededPolicy.ABORT)) {
            MaxChangesetSizeExceededPolicy policy = askMaxChangesetSizeExceedsPolicy();
            strategy.setPolicy(policy);
        }
        switch(strategy.getPolicy()) {
        case ABORT:
            // don't continue - finish() will send the user back to map editing
            //
            return false;
        case FILL_ONE_CHANGESET_AND_RETURN_TO_UPLOAD_DIALOG:
            // don't continue - finish() will send the user back to the upload dialog
            //
            return false;
        case AUTOMATICALLY_OPEN_NEW_CHANGESETS:
            // prepare the state of the task for a next iteration in uploading.
            //
            openNewChangeset();
            toUpload.removeProcessed(processedPrimitives);
            return true;
        }
        // should not happen
        return false;
    }

    /**
     * Retries to recover the upload operation from an exception which was thrown because
     * an uploaded primitive was already deleted on the server.
     *
     * @param e the exception throw by the API
     * @param monitor a progress monitor
     * @throws OsmTransferException  thrown if we can't recover from the exception
     */
    protected void recoverFromGoneOnServer(OsmApiPrimitiveGoneException e, ProgressMonitor monitor) throws OsmTransferException{
        if (!e.isKnownPrimitive()) throw e;
        OsmPrimitive p = layer.data.getPrimitiveById(e.getPrimitiveId(), e.getPrimitiveType());
        if (p == null) throw e;
        if (p.isDeleted()) {
            // we tried to delete an already deleted primitive.
            final String msg;
            final String displayName = p.getDisplayName(DefaultNameFormatter.getInstance());
            if (p instanceof Node) {
                msg = tr("Node ''{0}'' is already deleted. Skipping object in upload.", displayName);
            } else if (p instanceof Way) {
                msg = tr("Way ''{0}'' is already deleted. Skipping object in upload.", displayName);
            } else if (p instanceof Relation) {
                msg = tr("Relation ''{0}'' is already deleted. Skipping object in upload.", displayName);
            } else {
                msg = tr("Object ''{0}'' is already deleted. Skipping object in upload.", displayName);
            }
            monitor.appendLogMessage(msg);
            Main.warn(msg);
            processedPrimitives.addAll(writer.getProcessedPrimitives());
            processedPrimitives.add(p);
            toUpload.removeProcessed(processedPrimitives);
            return;
        }
        // exception was thrown because we tried to *update* an already deleted
        // primitive. We can't resolve this automatically. Re-throw exception,
        // a conflict is going to be created later.
        throw e;
    }

    protected void cleanupAfterUpload() {
        // we always clean up the data, even in case of errors. It's possible the data was
        // partially uploaded. Better run on EDT.
        //
        Runnable r  = new Runnable() {
            @Override
            public void run() {
                layer.cleanupAfterUpload(processedPrimitives);
                layer.onPostUploadToServer();
                ChangesetCache.getInstance().update(changeset);
            }
        };

        try {
            SwingUtilities.invokeAndWait(r);
        } catch(InterruptedException e) {
            lastException = e;
        } catch(InvocationTargetException e) {
            lastException = new OsmTransferException(e.getCause());
        }
    }

    @Override protected void realRun() {
        try {
            uploadloop:while(true) {
                try {
                    getProgressMonitor().subTask(trn("Uploading {0} object...", "Uploading {0} objects...", toUpload.getSize(), toUpload.getSize()));
                    synchronized(this) {
                        writer = new OsmServerWriter();
                    }
                    writer.uploadOsm(strategy, toUpload.getPrimitives(), changeset, getProgressMonitor().createSubTaskMonitor(1, false));

                    // if we get here we've successfully uploaded the data. Exit the loop.
                    //
                    break;
                } catch(OsmTransferCanceledException e) {
                    Main.error(e);
                    uploadCanceled = true;
                    break uploadloop;
                } catch(OsmApiPrimitiveGoneException e) {
                    // try to recover from  410 Gone
                    //
                    recoverFromGoneOnServer(e, getProgressMonitor());
                } catch(ChangesetClosedException e) {
                    processedPrimitives.addAll(writer.getProcessedPrimitives()); // OsmPrimitive in => OsmPrimitive out
                    changeset.setOpen(false);
                    switch(e.getSource()) {
                    case UNSPECIFIED:
                        throw e;
                    case UPDATE_CHANGESET:
                        // The changeset was closed when we tried to update it. Probably, our
                        // local list of open changesets got out of sync with the server state.
                        // The user will have to select another open changeset.
                        // Rethrow exception - this will be handled later.
                        //
                        throw e;
                    case UPLOAD_DATA:
                        // Most likely the changeset is full. Try to recover and continue
                        // with a new changeset, but let the user decide first (see
                        // recoverFromChangesetFullException)
                        //
                        if (recoverFromChangesetFullException()) {
                            continue;
                        }
                        lastException = e;
                        break uploadloop;
                    }
                } finally {
                    if (writer != null) {
                        processedPrimitives.addAll(writer.getProcessedPrimitives());
                    }
                    synchronized(this) {
                        writer = null;
                    }
                }
            }
            // if required close the changeset
            //
            if (strategy.isCloseChangesetAfterUpload() && changeset != null && !changeset.isNew() && changeset.isOpen()) {
                OsmApi.getOsmApi().closeChangeset(changeset, progressMonitor.createSubTaskMonitor(0, false));
            }
        } catch (Exception e) {
            if (uploadCanceled) {
                Main.info(tr("Ignoring caught exception because upload is canceled. Exception is: {0}", e.toString()));
            } else {
                lastException = e;
            }
        }
        if (uploadCanceled && processedPrimitives.isEmpty()) return;
        cleanupAfterUpload();
    }

    @Override protected void finish() {
        if (uploadCanceled)
            return;

        // depending on the success of the upload operation and on the policy for
        // multi changeset uploads this will sent the user back to the appropriate
        // place in JOSM, either
        // - to an error dialog
        // - to the Upload Dialog
        // - to map editing
        GuiHelper.runInEDT(new Runnable() {
            @Override
            public void run() {
                // if the changeset is still open after this upload we want it to
                // be selected on the next upload
                //
                ChangesetCache.getInstance().update(changeset);
                if (changeset != null && changeset.isOpen()) {
                    UploadDialog.getUploadDialog().setSelectedChangesetForNextUpload(changeset);
                }
                if (lastException == null) {
                    new Notification(
                            "<h3>" + tr("Upload successful!") + "</h3>")
                            .setIcon(ImageProvider.get("misc", "check_large"))
                            .show();
                    return;
                }
                if (lastException instanceof ChangesetClosedException) {
                    ChangesetClosedException e = (ChangesetClosedException)lastException;
                    if (e.getSource().equals(ChangesetClosedException.Source.UPDATE_CHANGESET)) {
                        handleFailedUpload(lastException);
                        return;
                    }
                    if (strategy.getPolicy() == null)
                        /* do nothing if unknown policy */
                        return;
                    if (e.getSource().equals(ChangesetClosedException.Source.UPLOAD_DATA)) {
                        switch(strategy.getPolicy()) {
                        case ABORT:
                            break; /* do nothing - we return to map editing */
                        case AUTOMATICALLY_OPEN_NEW_CHANGESETS:
                            break; /* do nothing - we return to map editing */
                        case FILL_ONE_CHANGESET_AND_RETURN_TO_UPLOAD_DIALOG:
                            // return to the upload dialog
                            //
                            toUpload.removeProcessed(processedPrimitives);
                            UploadDialog.getUploadDialog().setUploadedPrimitives(toUpload);
                            UploadDialog.getUploadDialog().setVisible(true);
                            break;
                        }
                    } else {
                        handleFailedUpload(lastException);
                    }
                } else {
                    handleFailedUpload(lastException);
                }
            }
        });
    }

    @Override protected void cancel() {
        uploadCanceled = true;
        synchronized(this) {
            if (writer != null) {
                writer.cancel();
            }
        }
    }
}
