/*
    Copyright (c) 2016 Michael Bohlender <michael.bohlender@kdemail.net>
    Copyright (c) 2016 Christian Mollekopf <mollekopf@kolabsys.com>

    This library is free software; you can redistribute it and/or modify it
    under the terms of the GNU Library General Public License as published by
    the Free Software Foundation; either version 2 of the License, or (at your
    option) any later version.

    This library 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 Library General Public
    License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to the
    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301, USA.
*/

#include "eventtreemodel.h"

#include <sink/log.h>
#include <sink/query.h>
#include <sink/store.h>

#include <QJsonArray>
#include <QJsonObject>
#include <QMetaEnum>

EventTreeModel::EventTreeModel(QObject *parent) : QAbstractItemModel(parent), partitionedEvents(7)
{
    Sink::Query query;
    query.request<Event::Summary>();
    query.request<Event::Description>();
    query.request<Event::StartTime>();
    query.request<Event::EndTime>();

    eventModel = Sink::Store::loadModel<Event>(query);

    QObject::connect(eventModel.data(), &QAbstractItemModel::dataChanged, this, &EventTreeModel::partitionData);

    Sink::Store::synchronize(Sink::Query());

    partitionData();
}

void EventTreeModel::partitionData()
{
    SinkLog() << "Partitioning event data";

    for (int i = 0; i < 7; ++i) {
        SinkLog() << "Clearing #" << i;
        partitionedEvents[i].clear();
    }

    for (int i = 0; i < eventModel->rowCount(); ++i) {
        auto event = eventModel->index(i, 0).data(Sink::Store::DomainObjectRole).value<Event::Ptr>();
        int dayOfWeek = event->getStartTime().date().dayOfWeek();

        Q_ASSERT(dayOfWeek != 0);

        SinkLog() << "Adding event in bucket #" << dayOfWeek;

        partitionedEvents[dayOfWeek - 1].append(event);
    }

    // auto bottomRight = index(partitionedEvents[6].size(), eventModel->columnCount() - 1, index(6,
    // 0));
    emit dataChanged({}, {});
}

QModelIndex EventTreeModel::index(int row, int column, const QModelIndex &parent) const
{
    SinkLog() << "Calling EventTreeModel::index with" << row << column << parent.isValid();

    if (!hasIndex(row, column, parent)) {
        return {};
    }

    if (!parent.isValid()) {
        // Asking for a LocalEventListModel

        // TODO: Assuming week view
        if (!(0 <= row && row <= 6)) {
            return {};
        }

        return createIndex(row, column, DAY_ID);
    }

    // Asking for an Event
    auto day = static_cast<int>(parent.internalId());

    Q_ASSERT(0 <= day && day <= 6);
    if (row >= partitionedEvents[day].size()) {
        return {};
    }

    return createIndex(row, column, day);
}

QModelIndex EventTreeModel::parent(const QModelIndex &index) const
{
    SinkLog() << "Calling GlobalEventListModel::parent with index:" << index.row() << index.column();

    if (!index.isValid()) {
        return {};
    }

    if (index.internalId() == DAY_ID) {
        return {};
    }

    auto day = index.internalId();

    return this->index(day, 0);
}

int EventTreeModel::rowCount(const QModelIndex &parent) const
{
    if (!parent.isValid()) {
        return 7;
    }

    auto day = parent.internalId();

    return partitionedEvents[day].size();
}

int EventTreeModel::columnCount(const QModelIndex &parent) const
{
    if (!parent.isValid()) {
        return 1;
    }

    return eventModel->columnCount();
}

bool EventTreeModel::hasChildren(const QModelIndex &parent) const
{
    return parent.internalId() == DAY_ID;
}

QVariant EventTreeModel::data(const QModelIndex &id, int role) const
{
    if (hasChildren(id)) {
        auto day = id.row();

        switch (role) {
            case Qt::DisplayRole:
                switch (day) {
                    case 0:
                        return "Monday";
                    case 1:
                        return "Tuesday";
                    case 2:
                        return "Wednesday";
                    case 3:
                        return "Thursday";
                    case 4:
                        return "Friday";
                    case 5:
                        return "Saturday";
                    case 6:
                        return "Sunday";
                    default:
                        SinkWarning() << "Unknown day";
                        return {};
                }
            case Events:
                //{
                //    auto result = QVariantList{};

                //    for (int i = 0; i < partitionedEvents[day].size(); ++i) {
                //        auto eventId = index(i, 0, id);
                //        SinkLog() << "Appending event:" << data(eventId, Summary);
                //        result.append(QVariantMap{
                //            {"text", data(eventId, Summary)},
                //            {"description", data(eventId, Description)},
                //            {"starts", data(eventId, StartTime)},
                //            {"duration", data(eventId, Duration)},
                //            {"color", "#123"},
                //            {"indention", 0},
                //        });
                //    }

                //    return result;
                //}
                return QVariantList{
                    QVariantMap{
                        {"summary", "Hello, World!"},
                        {"text", "Hello, World!"},
                        {"description", "This is Hello, world!"},
                        {"starts", 4},
                        {"duration", 3},
                        {"color", "#123"},
                        {"indention", 0},
                    },
                    QVariantMap{
                        {"summary", "Hello, World!"},
                        {"text", "Hello, World!"},
                        {"description", "This is Hello, world!"},
                        {"starts", 8},
                        {"duration", 3},
                        {"color", "#456"},
                        {"indention", 1},
                    },
                };
            default:
                SinkWarning() << "Unknown role for day:" << QMetaEnum::fromType<Roles>().valueToKey(role);
                return {};
        }
    }

    auto day = static_cast<int>(id.internalId());
    SinkLog() << "Fetching data for day" << day;
    auto event = partitionedEvents[day].at(id.row());

    switch (role) {
        case Summary:
            return event->getSummary();
        case Description:
            return event->getDescription();
        case StartTime:
            return event->getStartTime();
        case Duration: {
            auto start = event->getStartTime();
            auto end   = event->getEndTime();
            return start.secsTo(end) / 3600;
        }
        default:
            SinkWarning() << "Unknown role for event:" << QMetaEnum::fromType<Roles>().valueToKey(role);
            return {};
    }
}

QHash<int, QByteArray> EventTreeModel::roleNames() const
{
    QHash<int, QByteArray> roles;

    roles[Events]      = "events";
    roles[Summary]     = "summary";
    roles[Description] = "description";
    roles[StartTime]   = "starts";
    roles[Duration]    = "duration";

    return roles;
}