/*
 * Copyright (c) 2018, Daniel Gultsch All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation and/or
 * other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package de.pixart.messenger.http;

import android.util.Log;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;

import de.pixart.messenger.Config;
import de.pixart.messenger.entities.Account;
import de.pixart.messenger.entities.DownloadableFile;
import de.pixart.messenger.parser.IqParser;
import de.pixart.messenger.services.XmppConnectionService;
import de.pixart.messenger.utils.Namespace;
import de.pixart.messenger.xml.Element;
import de.pixart.messenger.xmpp.stanzas.IqPacket;
import rocks.xmpp.addr.Jid;

public class SlotRequester {

    private XmppConnectionService service;

    public SlotRequester(XmppConnectionService service) {
        this.service = service;
    }

    public void request(Method method, Account account, DownloadableFile file, String mime, String md5, OnSlotRequested callback) {
        if (method == Method.HTTP_UPLOAD) {
            Jid host = account.getXmppConnection().findDiscoItemByFeature(Namespace.HTTP_UPLOAD);
            requestHttpUpload(account, host, file, mime, callback);
        } else if (method == Method.HTTP_UPLOAD_LEGACY) {
            Jid host = account.getXmppConnection().findDiscoItemByFeature(Namespace.HTTP_UPLOAD_LEGACY);
            requestHttpUploadLegacy(account, host, file, mime, callback);
        } else {
            requestP1S3(account, Jid.of(account.getServer()), file.getName(), md5, callback);
        }
    }

    private void requestHttpUploadLegacy(Account account, Jid host, DownloadableFile file, String mime, OnSlotRequested callback) {
        IqPacket request = service.getIqGenerator().requestHttpUploadLegacySlot(host, file, mime);
        service.sendIqPacket(account, request, (a, packet) -> {
            if (packet.getType() == IqPacket.TYPE.RESULT) {
                Element slotElement = packet.findChild("slot", Namespace.HTTP_UPLOAD_LEGACY);
                if (slotElement != null) {
                    try {
                        final String putUrl = slotElement.findChildContent("put");
                        final String getUrl = slotElement.findChildContent("get");
                        if (getUrl != null && putUrl != null) {
                            Slot slot = new Slot(new URL(putUrl));
                            slot.getUrl = new URL(getUrl);
                            slot.headers = new HashMap<>();
                            slot.headers.put("Content-Type", mime == null ? "application/octet-stream" : mime);
                            callback.success(slot);
                            return;
                        }
                    } catch (MalformedURLException e) {
                        //fall through
                    }
                }
            }
            Log.d(Config.LOGTAG, account.getJid().toString() + ": invalid response to slot request " + packet);
            callback.failure(IqParser.extractErrorMessage(packet));
        });
    }

    private void requestHttpUpload(Account account, Jid host, DownloadableFile file, String mime, OnSlotRequested callback) {
        IqPacket request = service.getIqGenerator().requestHttpUploadSlot(host, file, mime);
        service.sendIqPacket(account, request, (a, packet) -> {
            if (packet.getType() == IqPacket.TYPE.RESULT) {
                Element slotElement = packet.findChild("slot", Namespace.HTTP_UPLOAD);
                if (slotElement != null) {
                    try {
                        final Element put = slotElement.findChild("put");
                        final Element get = slotElement.findChild("get");
                        final String putUrl = put == null ? null : put.getAttribute("url");
                        final String getUrl = get == null ? null : get.getAttribute("url");
                        if (getUrl != null && putUrl != null) {
                            Slot slot = new Slot(new URL(putUrl));
                            slot.getUrl = new URL(getUrl);
                            slot.headers = new HashMap<>();
                            for (Element child : put.getChildren()) {
                                if ("header".equals(child.getName())) {
                                    final String name = child.getAttribute("name");
                                    final String value = child.getContent();
                                    if (HttpUploadConnection.WHITE_LISTED_HEADERS.contains(name) && value != null && !value.trim().contains("\n")) {
                                        slot.headers.put(name, value.trim());
                                    }
                                }
                            }
                            slot.headers.put("Content-Type", mime == null ? "application/octet-stream" : mime);
                            callback.success(slot);
                            return;
                        }
                    } catch (MalformedURLException e) {
                        //fall through
                    }
                }
            }
            Log.d(Config.LOGTAG, account.getJid().toString() + ": invalid response to slot request " + packet);
            callback.failure(IqParser.extractErrorMessage(packet));
        });

    }

    private void requestP1S3(final Account account, Jid host, String filename, String md5, OnSlotRequested callback) {
        IqPacket request = service.getIqGenerator().requestP1S3Slot(host, md5);
        service.sendIqPacket(account, request, (a, packet) -> {
            if (packet.getType() == IqPacket.TYPE.RESULT) {
                String putUrl = packet.query(Namespace.P1_S3_FILE_TRANSFER).getAttribute("upload");
                String id = packet.query().getAttribute("fileid");
                try {
                    if (putUrl != null && id != null) {
                        Slot slot = new Slot(new URL(putUrl));
                        slot.getUrl = P1S3UrlStreamHandler.of(id, filename);
                        slot.headers = new HashMap<>();
                        slot.headers.put("Content-MD5", md5);
                        slot.headers.put("Content-Type", " "); //required to force it to empty. otherwise library will set something
                        callback.success(slot);
                        return;
                    }
                } catch (MalformedURLException e) {
                    //fall through;
                }
            }
            callback.failure("unable to request slot");
        });
        Log.d(Config.LOGTAG, "requesting slot with p1. md5=" + md5);
    }


    public interface OnSlotRequested {

        void success(Slot slot);

        void failure(String message);

    }

    public static class Slot {
        private final URL putUrl;
        private URL getUrl;
        private HashMap<String, String> headers;

        private Slot(URL putUrl) {
            this.putUrl = putUrl;
        }

        public URL getPutUrl() {
            return putUrl;
        }

        public URL getGetUrl() {
            return getUrl;
        }

        public HashMap<String, String> getHeaders() {
            return headers;
        }
    }
}