#include "checkqueuetablemodel.h"

#include <QMimeData>
#include <QIODevice>

CheckQueueTableModel::CheckQueueTableModel(std::vector<Check> *checks, QObject *parent)
    : checks(checks), QAbstractTableModel{parent}
{}

int CheckQueueTableModel::rowCount(const QModelIndex &parent) const { return checks->size(); }
int CheckQueueTableModel::columnCount(const QModelIndex &parent) const { return 2; }

QVariant CheckQueueTableModel::data(const QModelIndex &index, int role) const {
    if (!index.isValid() || index.row() >= checks->size())
        return QVariant();
    if (role != Qt::DisplayRole) return QVariant();
    Check& c = checks->at(index.row());
    switch (index.column()) {
    case 0:
        return QVariant::fromValue(QString::fromStdString(c.get_date()));
        break;
    case 1:
        return QVariant::fromValue(c.get_total());
        break;
    }

    return QVariant();
}

bool CheckQueueTableModel::setData(const QModelIndex &index, const QVariant &value, int role) {
    if (role == Qt::EditRole) {
        if (!index.isValid() || index.row() >= checks->size())
            return false;
        unsigned int row = index.row();
        switch (index.column()) {
        case 0: {
            checks->at(row).set_date(value.value<std::string>());
            break;
        } case 1:
            checks->at(row).set_total(value.value<double>());
            break;
        }
        return true;
    }
    return false;
}

QVariant CheckQueueTableModel::headerData(int section, Qt::Orientation orientation, int role) const {
    if (role == Qt::DisplayRole && orientation == Qt::Horizontal) {
        switch (section) {
        case 0:
            return tr("Date&Time");
            break;
        case 1:
            return tr("Total");
            break;
        }
    } else if (role == Qt::DisplayRole && orientation == Qt::Vertical) {
        return section + 1;
    }
    return QVariant();
}

Qt::ItemFlags CheckQueueTableModel::flags(const QModelIndex &index) const {
    auto flags = QAbstractItemModel::flags(index);

    if (index.isValid())
        flags |= Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsDragEnabled;
    else
        flags |= Qt::ItemIsDropEnabled;

    return flags;
}

Qt::DropActions CheckQueueTableModel::supportedDropActions() const {
    return Qt::DropActions() | Qt::MoveAction;
}

bool CheckQueueTableModel::insertRows(int position, int rows, const QModelIndex &index) {
    beginInsertRows(QModelIndex(), position, position+rows-1);
    for (int i = 0; i < rows; ++i)
        checks->emplace(checks->begin() + position, Check());

    endInsertRows();
    return true;
}

bool CheckQueueTableModel::removeRows(int position, int rows, const QModelIndex &index) {
    beginRemoveRows(QModelIndex(), position, position+rows-1);

    for (int row = 0; row < rows; ++row)
        checks->erase(std::next(checks->begin(), position));

    endRemoveRows();
    return true;
}

QStringList CheckQueueTableModel::mimeTypes() const {
    QStringList types;
    types << CheckQueueTableModel::MimeType;
    return types;
}

bool CheckQueueTableModel::canDropMimeData(const QMimeData *data, Qt::DropAction action, int row, int, const QModelIndex &) {
    if (action != Qt::MoveAction || !data->hasFormat(CheckQueueTableModel::MimeType))
        return false;
    if (row > checks->size()) return false;
    return true;
}

QMimeData* CheckQueueTableModel::mimeData(const QModelIndexList &indexes) const {
    QMimeData* mimeData = new QMimeData;
    QByteArray encodedData;

    QDataStream stream(&encodedData, QIODevice::WriteOnly);

    for (const QModelIndex &i : indexes) {
        if (i.isValid() && i.column() == 0) {
            QString date = data(i, Qt::DisplayRole).toString();
            double total = data(index(i.row(), i.column() + 1), Qt::DisplayRole).toDouble();
            stream << date << total;
        }
    }
    mimeData->setData(CheckQueueTableModel::MimeType, encodedData);
    return mimeData;
}

bool CheckQueueTableModel::dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) {
    if (!canDropMimeData(data, action, row, column, parent)) return false;
    if (action == Qt::IgnoreAction) return true;
    else if (action != Qt::MoveAction) return false;
    if (row > checks->size()) return false;

    QByteArray encodedData = data->data(CheckQueueTableModel::MimeType);
    QDataStream stream(&encodedData, QIODevice::ReadOnly);
    std::vector<Check> newItems;
    int rows = 0;

    while (!stream.atEnd()) {
        QString date;
        double total;
        stream >> date >> total;
        Check c;
        c.set_date(date.toStdString());
        c.set_total(total);
        newItems.push_back(c);
        ++rows;
    }

    insertRows(row, rows, QModelIndex());

    for (Check &c : newItems) {
        QModelIndex date_index = index(row, 0, QModelIndex());
        QModelIndex total_index = index(row, 1, QModelIndex());
        setData(date_index, QVariant::fromValue(c.get_date()), Qt::EditRole);
        setData(total_index, QVariant::fromValue(c.get_total()), Qt::EditRole);
        row++;
    }


    return true;
}