//SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
//SPDX-License-Identifier: GPL-3.0-or-later

#include "assets.h"

#include "utils/helpers.h"

const QHash<int, QByteArray> Models::Assets::roles({
    {Title, "title"}, {Icon, "icon"}, {Balance, "balance"}, {Archived, "archived"}, {Color, "color"}, {Currency, "currency"}, {CurrencyID, "currencyID"}, {ID, "assetID"}
});

Models::Assets::Assets (Currencies& currencies, QObject* parent):
    QAbstractListModel(parent),
    records(),
    state(State::initial),
    currencies(currencies)
{}

void Models::Assets::clear () {
    beginResetModel();
    records.clear();
    endResetModel();
}

void Models::Assets::add (const Asset& asset) {
    int index = getIndexByID(asset.id);
    if (index != -1)
        throw std::runtime_error("An attempt to insert a duplicating Asset to an asset model");

    beginInsertRows(QModelIndex(), records.size(), records.size());
    records.push_back(asset);
    endInsertRows();
}

void Models::Assets::add (const std::deque<Asset>& assets) {
    if (assets.empty())
        return;

    for (const Asset& asset : assets)
        if (getIndexByID(asset.id) != -1)
            throw std::runtime_error("An attempt to insert a duplicating Asset to an asset model (bulk)");

    beginInsertRows(QModelIndex(), records.size(), records.size() + assets.size() - 1);
    for (const Asset& asset : assets)
        records.push_back(asset);

    endInsertRows();
}

void Models::Assets::remove (Asset::ID id) {
    int index = getIndexByID(id);
    if (index == -1)
        throw std::runtime_error("An attempt to delete non existing Asset from asset model");

    beginRemoveRows(QModelIndex(), index, index);
    records.erase(records.begin() + index);
    endRemoveRows();
}

Models::Asset Models::Assets::get (Asset::ID id) const {
    int index = getIndexByID(id);
    if (index == -1)
        throw std::runtime_error("An attempt to access non existing Asset from asset model");

    return records[index];
}

int Models::Assets::rowCount (const QModelIndex& parent) const {
    //For list models only the root node (an invalid parent) should return the
    //list's size. For all other (valid) parents, rowCount() should return 0 so
    //that it does not become a tree model.
    if (parent.isValid())
        return 0;

    return records.size();
}

QHash<int, QByteArray> Models::Assets::roleNames () const {
    return roles;
}

bool Models::Assets::canFetchMore (const QModelIndex& parent) const {
    return state == State::initial;
}

void Models::Assets::fetchMore (const QModelIndex& parent) {
    if (state != State::initial)
        return;

    state = State::requesting;
    emit requestAssets();
}

QVariant Models::Assets::data (const QModelIndex& index, int role) const {
    if (!index.isValid())
        return QVariant();

    int row = index.row();
    if (row >= 0 && row < records.size()) {
        switch (role) {
            case Qt::DisplayRole:
            case Title:
                return records[row].title;
            case Icon:
                return records[row].icon;
            case Balance:
                return records[row].balance;
            case Archived:
                return records[row].archived;
            case Color:
                return records[row].color;
            case Currency:
                return currencies.getCode(records[row].currency);
            case CurrencyID:
                return records[row].currency;
            case ID:
                return records[row].id;
        }
    }

    return QVariant();
}

bool Models::Assets::deserialize (const QVariantList& from, std::deque<Asset>& out) {
    for (const QVariant& item : from) {
        if (!item.canConvert<QVariantMap>())
            return false;

        const QVariantMap& ser = qast<QVariantMap>(item);
        Asset& asset = out.emplace_back();
        asset.title = ser.value("title").toString();
        asset.icon = ser.value("icon").toString();
        asset.archived = ser.value("archived").toBool();
        asset.id = ser.value("id").toUInt();
        asset.currency = ser.value("currency").toUInt();

        uint32_t color = ser.value("color").toUInt();
        asset.color = QColor::fromRgba(color);
    }

    return true;
}

void Models::Assets::receivedAssets (const std::deque<Asset>& assets) {
    beginResetModel();
    records = assets;
    state = State::syncronized;
    endResetModel();
}

int Models::Assets::getIndexByID (Asset::ID id) const {
    for (std::size_t i = 0; i < records.size(); ++i) {
        if (records[i].id == id)
            return i;
    }

    return -1;
}

QVariantMap Models::Assets::getAssetByIndex (int index) const {
    QVariantMap result;
    if (index < 0 || index >= records.size())
        return result;

    QModelIndex idx = createIndex(index, 0, &records[index]);
    for (int role = Roles::Title; role != Roles::ID; ++role)
        result[roles[role]] = data(idx, role);

    return result;
}

QVariantMap Models::Assets::getAssetByID (Asset::ID id) const {
    return getAssetByIndex(getIndexByID(id));
}