/*
 * Copyright (C) by Roeland Jago Douma <roeland@owncloud.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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.
 */

#include "sharee.h"
#include "ocsshareejob.h"

#include <QJsonObject>
#include <QJsonDocument>
#include <QJsonArray>

namespace OCC {

Q_LOGGING_CATEGORY(lcSharing, "nextcloud.gui.sharing", QtInfoMsg)

Sharee::Sharee(const QString shareWith,
    const QString displayName,
    const Type type)
    : _shareWith(shareWith)
    , _displayName(displayName)
    , _type(type)
{
}

QString Sharee::format() const
{
    QString formatted = _displayName;

    if (_type == Type::Group) {
        formatted += QLatin1String(" (group)");
    } else if (_type == Type::Federated) {
        formatted += QLatin1String(" (remote)");
    }

    return formatted;
}

QString Sharee::shareWith() const
{
    return _shareWith;
}

QString Sharee::displayName() const
{
    return _displayName;
}

Sharee::Type Sharee::type() const
{
    return _type;
}

ShareeModel::ShareeModel(const AccountPtr &account, const QString &type, QObject *parent)
    : QAbstractListModel(parent)
    , _account(account)
    , _type(type)
{
}

void ShareeModel::fetch(const QString &search, const ShareeSet &blacklist)
{
    _search = search;
    _shareeBlacklist = blacklist;
    OcsShareeJob *job = new OcsShareeJob(_account);
    connect(job, &OcsShareeJob::shareeJobFinished, this, &ShareeModel::shareesFetched);
    connect(job, &OcsJob::ocsError, this, &ShareeModel::displayErrorMessage);
    job->getSharees(_search, _type, 1, 50);
}

void ShareeModel::shareesFetched(const QJsonDocument &reply)
{
    auto data = reply.object().value("ocs").toObject().value("data").toObject();

    QVector<QSharedPointer<Sharee>> newSharees;

    /*
     * Todo properly loop all of this
     */
    auto exact = data.value("exact").toObject();
    {
        auto users = exact.value("users").toArray();
        foreach (auto user, users) {
            newSharees.append(parseSharee(user.toObject()));
        }
        auto groups = exact.value("groups").toArray();
        foreach (auto group, groups) {
            newSharees.append(parseSharee(group.toObject()));
        }
        auto remotes = exact.value("remotes").toArray();
        foreach (auto remote, remotes) {
            newSharees.append(parseSharee(remote.toObject()));
        }
    }

    {
        auto users = data.value("users").toArray();
        foreach (auto user, users) {
            newSharees.append(parseSharee(user.toObject()));
        }
    }
    {
        auto groups = data.value("groups").toArray();
        foreach (auto group, groups) {
            newSharees.append(parseSharee(group.toObject()));
        }
    }
    {
        auto remotes = data.value("remotes").toArray();
        foreach (auto remote, remotes) {
            newSharees.append(parseSharee(remote.toObject()));
        }
    }

    // Filter sharees that we have already shared with
    QVector<QSharedPointer<Sharee>> filteredSharees;
    foreach (const auto &sharee, newSharees) {
        bool found = false;
        foreach (const auto &blacklistSharee, _shareeBlacklist) {
            if (sharee->type() == blacklistSharee->type() && sharee->shareWith() == blacklistSharee->shareWith()) {
                found = true;
                break;
            }
        }

        if (found == false) {
            filteredSharees.append(sharee);
        }
    }

    setNewSharees(filteredSharees);
    shareesReady();
}

QSharedPointer<Sharee> ShareeModel::parseSharee(const QJsonObject &data)
{
    const QString displayName = data.value("label").toString();
    const QString shareWith = data.value("value").toObject().value("shareWith").toString();
    Sharee::Type type = (Sharee::Type)data.value("value").toObject().value("shareType").toInt();

    return QSharedPointer<Sharee>(new Sharee(shareWith, displayName, type));
}


// Helper function for setNewSharees   (could be a lambda when we can use them)
static QSharedPointer<Sharee> shareeFromModelIndex(const QModelIndex &idx)
{
    return idx.data(Qt::UserRole).value<QSharedPointer<Sharee>>();
}

struct FindShareeHelper
{
    const QSharedPointer<Sharee> &sharee;
    bool operator()(const QSharedPointer<Sharee> &s2) const
    {
        return s2->format() == sharee->format() && s2->displayName() == sharee->format();
    }
};

/* Set the new sharee

    Do that while preserving the model index so the selection stays
*/
void ShareeModel::setNewSharees(const QVector<QSharedPointer<Sharee>> &newSharees)
{
    layoutAboutToBeChanged();
    const auto persistent = persistentIndexList();
    QVector<QSharedPointer<Sharee>> oldPersistantSharee;
    oldPersistantSharee.reserve(persistent.size());

    std::transform(persistent.begin(), persistent.end(), std::back_inserter(oldPersistantSharee),
        shareeFromModelIndex);

    _sharees = newSharees;

    QModelIndexList newPersistant;
    newPersistant.reserve(persistent.size());
    foreach (const QSharedPointer<Sharee> &sharee, oldPersistantSharee) {
        FindShareeHelper helper = { sharee };
        auto it = std::find_if(_sharees.constBegin(), _sharees.constEnd(), helper);
        if (it == _sharees.constEnd()) {
            newPersistant << QModelIndex();
        } else {
            newPersistant << index(it - _sharees.constBegin());
        }
    }

    changePersistentIndexList(persistent, newPersistant);
    layoutChanged();
}


int ShareeModel::rowCount(const QModelIndex &) const
{
    return _sharees.size();
}

QVariant ShareeModel::data(const QModelIndex &index, int role) const
{
    if (index.row() < 0 || index.row() > _sharees.size()) {
        return QVariant();
    }

    const auto &sharee = _sharees.at(index.row());
    if (role == Qt::DisplayRole) {
        return sharee->format();

    } else if (role == Qt::EditRole) {
        // This role is used by the completer - it should match
        // the full name and the user name and thus we include both
        // in the output here. But we need to take care this string
        // doesn't leak to the user.
        return QString(sharee->displayName() + " (" + sharee->shareWith() + ")");

    } else if (role == Qt::UserRole) {
        return QVariant::fromValue(sharee);
    }

    return QVariant();
}

QSharedPointer<Sharee> ShareeModel::getSharee(int at)
{
    if (at < 0 || at > _sharees.size()) {
        return QSharedPointer<Sharee>(nullptr);
    }

    return _sharees.at(at);
}
}
