/*
    SPDX-FileCopyrightText: 2007-2019 Thomas Baumgart <tbaumgart@kde.org>
    SPDX-FileCopyrightText: 2017-2018 Łukasz Wojniłowicz <lukasz.wojnilowicz@gmail.com>
    SPDX-License-Identifier: GPL-2.0-or-later
*/

#ifndef KACCOUNTSVIEW_P_H
#define KACCOUNTSVIEW_P_H

#include "kaccountsview.h"

// ----------------------------------------------------------------------------
// QT Includes

#include <QAction>
#include <QPointer>

// ----------------------------------------------------------------------------
// KDE Includes

#include <KMessageBox>

// ----------------------------------------------------------------------------
// Project Includes

#include "ui_kaccountsview.h"
#include "kmymoneyviewbase_p.h"
#include "mymoneyfile.h"
#include "accountsmodel.h"

#include "mymoneyexception.h"
#include "mymoneysplit.h"
#include "mymoneyschedule.h"
#include "mymoneytransaction.h"
#include "knewaccountdlg.h"
#include "keditloanwizard.h"
#include "mymoneyaccount.h"
#include "mymoneymoney.h"
#include "accountsproxymodel.h"
#include "kmymoneyplugin.h"
#include "icons.h"
#include "mymoneyenums.h"
#include "menuenums.h"
#include "mymoneystatementreader.h"
#include "kmymoneyutils.h"
#include "columnselector.h"

using namespace Icons;

class KAccountsViewPrivate : public KMyMoneyViewBasePrivate
{
    Q_DECLARE_PUBLIC(KAccountsView)

public:
    explicit KAccountsViewPrivate(KAccountsView *qq)
        : KMyMoneyViewBasePrivate(qq)
        , ui(new Ui::KAccountsView)
        , m_haveUnusedCategories(false)
        , m_onlinePlugins(nullptr)
        , m_proxyModel(nullptr)
    {
    }

    ~KAccountsViewPrivate()
    {
        delete ui;
    }

    void init()
    {
        Q_Q(KAccountsView);

        ui->setupUi(q);

        // setup icons for collapse and expand button
        ui->m_collapseButton->setIcon(Icons::get(Icon::ListCollapse));
        ui->m_expandButton->setIcon(Icons::get(Icon::ListExpand));

        // setup filter
        m_proxyModel = ui->m_accountTree->proxyModel();
        q->connect(ui->m_searchWidget, &QLineEdit::textChanged, m_proxyModel, &QSortFilterProxyModel::setFilterFixedString);

        auto columnSelector = new ColumnSelector(ui->m_accountTree, q->metaObject()->className());
        columnSelector->setAlwaysVisible(QVector<int>({ AccountsModel::Column::AccountName }));
        columnSelector->setAlwaysHidden(QVector<int>({
            AccountsModel::Column::PostedValue,
            AccountsModel::Column::BankCode,
            AccountsModel::Column::Bic,
            AccountsModel::Column::CostCenter,
        }));

        ui->m_accountTree->setModel(MyMoneyFile::instance()->accountsModel());
        m_proxyModel->addAccountGroup(AccountsProxyModel::assetLiabilityEquity());
        m_proxyModel->setFilterComboBox(ui->m_filterBox);
        m_proxyModel->setClosedSelectable(true);

        columnSelector->setModel(m_proxyModel);
        q->slotSettingsChanged();

        // forward the widget requests
        q->connect(ui->m_accountTree, &KMyMoneyAccountTreeView::requestCustomContextMenu, q, &KAccountsView::requestCustomContextMenu);
        q->connect(ui->m_accountTree, &KMyMoneyAccountTreeView::requestSelectionChange, q, &KAccountsView::requestSelectionChange);
        q->connect(ui->m_accountTree, &KMyMoneyAccountTreeView::requestActionTrigger, q, &KAccountsView::requestActionTrigger);

        m_focusWidget = ui->m_accountTree;

        // make sure to update our local copy if the account data changes
        q->connect(ui->m_accountTree->model(), &QAbstractItemModel::dataChanged, q, [&](const QModelIndex& topLeft, const QModelIndex& bottomRight) {
            // it should be only one row, but we never know and so we loop over all of them
            for (int row = topLeft.row(); row <= bottomRight.row(); ++row) {
                const auto idx = ui->m_accountTree->model()->index(row, 0, topLeft.parent());
                const auto id = idx.data(eMyMoney::Model::IdRole).toString();
                if (id == m_currentAccount.id()) {
                    m_currentAccount = MyMoneyFile::instance()->accountsModel()->itemById(id);
                    break;
                }
            }
        });

        // ignore entries in the root level, they are the account groups and not accounts
        ui->m_accountTree->setSkipRootLevelEntries(true);
    }

    void editLoan()
    {
        Q_Q(KAccountsView);
        if (m_currentAccount.id().isEmpty())
            return;

        const auto file = MyMoneyFile::instance();
        if (file->isStandardAccount(m_currentAccount.id()))
            return;

        QPointer<KEditLoanWizard> wizard = new KEditLoanWizard(m_currentAccount);
        q->connect(wizard, &KEditLoanWizard::newCategory, q, &KAccountsView::slotNewCategory);
        q->connect(wizard, &KEditLoanWizard::createPayee, q, &KAccountsView::slotNewPayee);
        if (wizard->exec() == QDialog::Accepted && wizard != 0) {
            MyMoneySchedule sch;
            try {
                sch = file->schedule(m_currentAccount.value("schedule").toLatin1());
            } catch (const MyMoneyException &) {
                qDebug() << "schedule" << m_currentAccount.value("schedule").toLatin1() << "not found";
            }
            if (!(m_currentAccount == wizard->account())
                    || !(sch == wizard->schedule())) {
                MyMoneyFileTransaction ft;
                try {
                    file->modifyAccount(wizard->account());
                    if (!sch.id().isEmpty()) {
                        sch = wizard->schedule();
                    }
                    try {
                        file->schedule(sch.id());
                        file->modifySchedule(sch);
                        ft.commit();
                    } catch (const MyMoneyException &) {
                        try {
                            if(sch.transaction().splitCount() >= 2) {
                                file->addSchedule(sch);
                            }
                            ft.commit();
                        } catch (const MyMoneyException &e) {
                            qDebug("Cannot add schedule: '%s'", e.what());
                        }
                    }
                } catch (const MyMoneyException &e) {
                    qDebug("Unable to modify account %s: '%s'", qPrintable(m_currentAccount.name()),
                           e.what());
                }
            }
        }
        delete wizard;
    }

    void editAccount()
    {
        if (m_currentAccount.id().isEmpty())
            return;

        const auto file = MyMoneyFile::instance();
        if (file->isStandardAccount(m_currentAccount.id()))
            return;


        // set a status message so that the application can't be closed until the editing is done
        //        slotStatusMsg(caption);

        auto tid = file->openingBalanceTransaction(m_currentAccount);
        MyMoneyTransaction t;
        MyMoneySplit s0, s1;
        QPointer<KNewAccountDlg> dlg =
            new KNewAccountDlg(m_currentAccount, true, false, 0, i18n("Edit account '%1'", m_currentAccount.name()));

        if (!tid.isEmpty()) {
            try {
                t = file->transaction(tid);
                s0 = t.splitByAccount(m_currentAccount.id());
                s1 = t.splitByAccount(m_currentAccount.id(), false);
                dlg->setOpeningBalance(s0.shares());
                if (m_currentAccount.accountGroup() == eMyMoney::Account::Type::Liability) {
                    dlg->setOpeningBalance(-s0.shares());
                }
            } catch (const MyMoneyException &e) {
                qDebug() << "Error retrieving opening balance transaction " << tid << ": " << e.what() << "\n";
                tid.clear();
            }
        }

        // check for online modules
        QMap<QString, KMyMoneyPlugin::OnlinePlugin *>::const_iterator it_plugin;
        if (m_onlinePlugins) {
            it_plugin = m_onlinePlugins->cend();
            const auto& kvp = m_currentAccount.onlineBankingSettings();
            if (!kvp["provider"].isEmpty()) {
                // if we have an online provider for this account, we need to check
                // that we have the corresponding plugin. If that exists, we ask it
                // to provide an additional tab for the account editor.
                it_plugin = m_onlinePlugins->constFind(kvp["provider"].toLower());
                if (it_plugin != m_onlinePlugins->cend()) {
                    QString name;
                    auto w = (*it_plugin)->accountConfigTab(m_currentAccount, name);
                    dlg->addTab(w, name);
                }
            }
        }

        if (dlg->exec() == QDialog::Accepted) {
            if (dlg != nullptr) {
                try {
                    auto account = dlg->account();
                    auto parent = dlg->parentAccount();
                    auto bal = dlg->openingBalance();
                    if (account.accountGroup() == eMyMoney::Account::Type::Liability) {
                        bal = -bal;
                    }

                    // determine if the opening balance transaction will change

                    // do we remove the transaction?
                    auto balanceTransactionChanges = (!tid.isEmpty() && bal.isZero());
                    // do we modify the transaction?
                    balanceTransactionChanges |= (!tid.isEmpty() && !bal.isZero() && ((s0.shares() != bal) || (t.postDate() != account.openingDate())));
                    // do we create the transaction?
                    balanceTransactionChanges |= (tid.isEmpty() && !bal.isZero());
                    // or do we reparent the account
                    balanceTransactionChanges |= (account.parentAccountId() != parent.id());

                    MyMoneyFileTransaction ft(i18nc("Undo action description", "Edit account"), balanceTransactionChanges);

                    if (m_onlinePlugins && it_plugin != m_onlinePlugins->cend()) {
                        account.setOnlineBankingSettings((*it_plugin)->onlineBankingSettings(account.onlineBankingSettings()));
                    }
                    // we need to modify first, as reparent would override all other changes
                    file->modifyAccount(account);
                    if (account.parentAccountId() != parent.id()) {
                        file->reparentAccount(account, parent);
                    }
                    if (!tid.isEmpty()) {
                        if (bal.isZero()) {
                            file->removeTransaction(t);

                        } else if ((s0.shares() != bal) || (t.postDate() != account.openingDate())) {
                            s0.setShares(bal);
                            s0.setValue(bal);
                            t.modifySplit(s0);
                            s1.setShares(-bal);
                            s1.setValue(-bal);
                            t.modifySplit(s1);
                            t.setPostDate(account.openingDate());
                            file->modifyTransaction(t);
                        }

                    } else if (!bal.isZero()) {
                        file->createOpeningBalanceTransaction(account, bal);
                    }

                    ft.commit();
                    m_currentAccount = account;

                } catch (const MyMoneyException& e) {
                    Q_Q(KAccountsView);
                    KMessageBox::error(q, i18n("Unable to modify account '%1'. Cause: %2", m_currentAccount.name(), e.what()));
                }
            }
        }
        delete dlg;
    }

    enum CanCloseAccountCodeE {
        AccountCanClose = 0,        // can close the account
        AccountBalanceNonZero,      // balance is non zero
        AccountChildrenOpen,        // account has open children account
        AccountScheduleReference,   // account is referenced in a schedule
        AccountHasOnlineMapping,    // account has an online mapping
    };

    /**
     * This method checks, if an account can be closed or not. An account
     * can be closed if:
     *
     * - the balance is zero and
     * - all children are already closed (or it is an investment account and all sub-accounts can be closed) and
     * - there is no unfinished schedule referencing the account
     * - and no online mapping is setup
     *
     * @param acc reference to MyMoneyAccount object in question
     * @retval true account can be closed
     * @retval false account cannot be closed
     */
    CanCloseAccountCodeE canCloseAccount(const MyMoneyAccount& acc)
    {
        // balance must be zero
        if (!acc.balance().isZero())
            return AccountBalanceNonZero;
        if (acc.hasOnlineMapping())
            return AccountHasOnlineMapping;

        // all children must be already closed
        const auto accList = acc.accountList();
        for (const auto& sAccount : accList) {
            const auto subAccount = MyMoneyFile::instance()->account(sAccount);
            if (acc.accountType() == eMyMoney::Account::Type::Investment) {
                auto subAccountResult = canCloseAccount(subAccount);
                if (subAccountResult != AccountCanClose)
                    return AccountChildrenOpen;

            } else if (!subAccount.isClosed()) {
                return AccountChildrenOpen;
            }
        }

        // there must be no unfinished schedule referencing the account
        QList<MyMoneySchedule> list = MyMoneyFile::instance()->scheduleList();
        QList<MyMoneySchedule>::const_iterator it_l;
        for (it_l = list.cbegin(); it_l != list.cend(); ++it_l) {
            if ((*it_l).isFinished())
                continue;
            if ((*it_l).hasReferenceTo(acc.id()))
                return AccountScheduleReference;
        }
        return AccountCanClose;
    }

    /**
     * This method checks if an account can be closed and enables/disables
     * the close account action
     * If disabled, it sets a tooltip explaining why it cannot be closed
     * @brief enableCloseAccountAction
     * @param acc reference to MyMoneyAccount object in question
     */
    void hintCloseAccountAction(const MyMoneyAccount& acc, QAction* a)
    {
        switch (canCloseAccount(acc)) {
        case AccountCanClose:
            a->setToolTip(QString());
            break;
        case AccountBalanceNonZero:
            a->setToolTip(i18n("The balance of the account must be zero before the account can be closed"));
            break;
        case AccountChildrenOpen:
            a->setToolTip(i18n("All subaccounts must be closed before the account can be closed"));
            break;
        case AccountScheduleReference:
            a->setToolTip(i18n("This account is still included in an active schedule"));
            break;
        case AccountHasOnlineMapping:
            a->setToolTip(i18n("This account is still mapped to an online account"));
            break;
        }
    }

    void accountsUpdateOnline(const QList<MyMoneyAccount>& accList)
    {
        Q_Q(KAccountsView);
        // block the update account actions for now so that we don't get here twice
        const QVector<eMenu::Action> disabledActions {eMenu::Action::UpdateAccount, eMenu::Action::UpdateAllAccounts};
        for (const auto& a : disabledActions)
            pActions[a]->setEnabled(false);

        // clear global message list
        MyMoneyStatementReader::clearResultMessages();

        // process all entries that have a mapped account and the 'provider' is available
        // we need to make sure that only the very last entry that matches sets the
        // 'moreAccounts' parameter in the call to updateAccount() to false
        auto processedAccounts = 0;

        Q_EMIT q->beginImportingStatements();
        for (auto it_provider = m_onlinePlugins->cbegin(); it_provider != m_onlinePlugins->cend(); ++it_provider) {
            auto nextAccount = accList.cend();
            for (auto it_a = accList.cbegin(); it_a != accList.cend(); ++it_a) {
                if ((*it_a).hasOnlineMapping()
                        && (it_provider == m_onlinePlugins->constFind((*it_a).onlineBankingSettings().value("provider").toLower()))) {
                    if (nextAccount != accList.cend()) {
                        (*it_provider)->updateAccount(*nextAccount, true);
                    }
                    nextAccount = it_a;
                    ++processedAccounts;
                }
            }
            // process a possible pending entry
            if (nextAccount != accList.cend()) {
                (*it_provider)->updateAccount(*nextAccount, false);
            }
        }
        Q_EMIT q->endImportingStatements();

        // re-enable the disabled actions
        updateActions(m_currentAccount);

        KMyMoneyUtils::showStatementImportResult(MyMoneyStatementReader::resultMessages(), processedAccounts);
    }

    void updateActions(const MyMoneyAccount& acc)
    {
        const auto file = MyMoneyFile::instance();
        switch (acc.accountGroup()) {
        case eMyMoney::Account::Type::Asset:
        case eMyMoney::Account::Type::Liability:
        case eMyMoney::Account::Type::Equity:
        {
            auto isClosed = acc.isClosed() ? true : false;
            pActions[eMenu::Action::EditAccount]->setEnabled(!isClosed);
            pActions[eMenu::Action::DeleteAccount]->setEnabled(!file->isReferenced(acc));

            pActions[eMenu::Action::ReopenAccount]->setEnabled(isClosed);
            pActions[eMenu::Action::CloseAccount]->setEnabled(!isClosed);

            if (!isClosed) {
                const auto canClose = (canCloseAccount(acc) == KAccountsViewPrivate::AccountCanClose) ? true : false;
                pActions[eMenu::Action::CloseAccount]->setEnabled(canClose);
                hintCloseAccountAction(acc, pActions[eMenu::Action::CloseAccount]);
            }

            pActions[eMenu::Action::ChartAccountBalance]->setEnabled(true);

            if (acc.hasOnlineMapping()) {
                pActions[eMenu::Action::MapOnlineAccount]->setEnabled(false);
                pActions[eMenu::Action::UnmapOnlineAccount]->setEnabled(true);

                if (m_onlinePlugins) {
                    // check if provider is available
                    QMap<QString, KMyMoneyPlugin::OnlinePlugin*>::const_iterator it_p;
                    it_p = m_onlinePlugins->constFind(acc.onlineBankingSettings().value(QLatin1String("provider")).toLower());
                    if (it_p != m_onlinePlugins->cend()) {
                        QStringList protocols;
                        (*it_p)->protocols(protocols);
                        if (protocols.count() > 0) {
                            pActions[eMenu::Action::UpdateAccount]->setEnabled(true);
                        }
                    }
                }

            } else {
                pActions[eMenu::Action::MapOnlineAccount]->setEnabled(!acc.isClosed() && m_onlinePlugins && !m_onlinePlugins->isEmpty());
            }

            break;
        }
        default:
            break;
        }
        pActions[eMenu::Action::UpdateAllAccounts]->setEnabled(KMyMoneyUtils::canUpdateAllAccounts());
    }

    Ui::KAccountsView   *ui;
    bool                m_haveUnusedCategories;
    MyMoneyAccount      m_currentAccount;
    QMap<QString, KMyMoneyPlugin::OnlinePlugin*>* m_onlinePlugins;
    AccountsProxyModel* m_proxyModel;
};

#endif
