// Copyright (c) 2011-2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#if defined(HAVE_CONFIG_H)
#include "config/bitcoin-config.h"
#endif

#include "optionsmodel.h"

#include "bitcoinunits.h"
#include "guiutil.h"

#include "amount.h"
#include "init.h"
#include "intro.h"
#include "net.h"
#include "netbase.h"
#include "txdb.h"       // for -dbcache defaults
#include "validation.h" // For DEFAULT_SCRIPTCHECK_THREADS

#ifdef ENABLE_WALLET
#include "wallet/wallet.h"
#include "wallet/walletdb.h"
#endif

#include <QNetworkProxy>
#include <QSettings>
#include <QStringList>

OptionsModel::OptionsModel(QObject *parent, bool resetSettings)
    : QAbstractListModel(parent) {
    Init(resetSettings);
}

void OptionsModel::addOverriddenOption(const std::string &option) {
    strOverriddenByCommandLine += QString::fromStdString(option) + "=" +
                                  QString::fromStdString(GetArg(option, "")) +
                                  " ";
}

// Writes all missing QSettings with their default values
void OptionsModel::Init(bool resetSettings) {
    if (resetSettings) {
        Reset();
    }

    checkAndMigrate();

    QSettings settings;

    // Ensure restart flag is unset on client startup
    setRestartRequired(false);

    // These are Qt-only settings:

    // Window
    if (!settings.contains("fHideTrayIcon")) {
        settings.setValue("fHideTrayIcon", false);
    }
    fHideTrayIcon = settings.value("fHideTrayIcon").toBool();
    Q_EMIT hideTrayIconChanged(fHideTrayIcon);

    if (!settings.contains("fMinimizeToTray")) {
        settings.setValue("fMinimizeToTray", false);
    }
    fMinimizeToTray =
        settings.value("fMinimizeToTray").toBool() && !fHideTrayIcon;

    if (!settings.contains("fMinimizeOnClose")) {
        settings.setValue("fMinimizeOnClose", false);
    }
    fMinimizeOnClose = settings.value("fMinimizeOnClose").toBool();

    // Display
    if (!settings.contains("nDisplayUnit")) {
        settings.setValue("nDisplayUnit", BitcoinUnits::BTCC);
    }
    nDisplayUnit = settings.value("nDisplayUnit").toInt();

    if (!settings.contains("strThirdPartyTxUrls")) {
        settings.setValue("strThirdPartyTxUrls", "");
    }
    strThirdPartyTxUrls = settings.value("strThirdPartyTxUrls", "").toString();

    if (!settings.contains("fCoinControlFeatures")) {
        settings.setValue("fCoinControlFeatures", false);
    }
    fCoinControlFeatures =
        settings.value("fCoinControlFeatures", false).toBool();

    // These are shared with the core or have a command-line parameter
    // and we want command-line parameters to overwrite the GUI settings.
    //
    // If setting doesn't exist create it with defaults.
    //
    // If SoftSetArg() or SoftSetBoolArg() return false we were overridden
    // by command-line and show this in the UI.

    // Main
    if (!settings.contains("nDatabaseCache")) {
        settings.setValue("nDatabaseCache", (qint64)nDefaultDbCache);
    }
    if (!SoftSetArg(
            "-dbcache",
            settings.value("nDatabaseCache").toString().toStdString())) {
        addOverriddenOption("-dbcache");
    }

    if (!settings.contains("nThreadsScriptVerif")) {
        settings.setValue("nThreadsScriptVerif", DEFAULT_SCRIPTCHECK_THREADS);
    }
    if (!SoftSetArg(
            "-par",
            settings.value("nThreadsScriptVerif").toString().toStdString())) {
        addOverriddenOption("-par");
    }

    if (!settings.contains("strDataDir")) {
        settings.setValue("strDataDir", Intro::getDefaultDataDirectory());
    }

// Wallet
#ifdef ENABLE_WALLET
    if (!settings.contains("bSpendZeroConfChange")) {
        settings.setValue("bSpendZeroConfChange", true);
    }
    if (!SoftSetBoolArg("-spendzeroconfchange",
                        settings.value("bSpendZeroConfChange").toBool())) {
        addOverriddenOption("-spendzeroconfchange");
    }
#endif

    // Network
    if (!settings.contains("fUseUPnP")) {
        settings.setValue("fUseUPnP", DEFAULT_UPNP);
    }
    if (!SoftSetBoolArg("-upnp", settings.value("fUseUPnP").toBool())) {
        addOverriddenOption("-upnp");
    }

    if (!settings.contains("fListen")) {
        settings.setValue("fListen", DEFAULT_LISTEN);
    }
    if (!SoftSetBoolArg("-listen", settings.value("fListen").toBool())) {
        addOverriddenOption("-listen");
    }

    if (!settings.contains("fUseProxy")) {
        settings.setValue("fUseProxy", false);
    }
    if (!settings.contains("addrProxy")) {
        settings.setValue("addrProxy", "127.0.0.1:9050");
    }
    // Only try to set -proxy, if user has enabled fUseProxy
    if (settings.value("fUseProxy").toBool() &&
        !SoftSetArg("-proxy",
                    settings.value("addrProxy").toString().toStdString())) {
        addOverriddenOption("-proxy");
    } else if (!settings.value("fUseProxy").toBool() &&
               !GetArg("-proxy", "").empty()) {
        addOverriddenOption("-proxy");
    }

    if (!settings.contains("fUseSeparateProxyTor")) {
        settings.setValue("fUseSeparateProxyTor", false);
    }
    if (!settings.contains("addrSeparateProxyTor")) {
        settings.setValue("addrSeparateProxyTor", "127.0.0.1:9050");
    }
    // Only try to set -onion, if user has enabled fUseSeparateProxyTor
    if (settings.value("fUseSeparateProxyTor").toBool() &&
        !SoftSetArg(
            "-onion",
            settings.value("addrSeparateProxyTor").toString().toStdString())) {
        addOverriddenOption("-onion");
    } else if (!settings.value("fUseSeparateProxyTor").toBool() &&
               !GetArg("-onion", "").empty()) {
        addOverriddenOption("-onion");
    }

    // Display
    if (!settings.contains("language")) {
        settings.setValue("language", "");
    }
    if (!SoftSetArg("-lang",
                    settings.value("language").toString().toStdString())) {
        addOverriddenOption("-lang");
    }

    language = settings.value("language").toString();
}

void OptionsModel::Reset() {
    QSettings settings;

    // Save the strDataDir setting
    QString dataDir = Intro::getDefaultDataDirectory();
    dataDir = settings.value("strDataDir", dataDir).toString();

    // Remove all entries from our QSettings object
    settings.clear();

    // Set strDataDir
    settings.setValue("strDataDir", dataDir);

    // Set that this was reset
    settings.setValue("fReset", true);

    // default setting for OptionsModel::StartAtStartup - disabled
    if (GUIUtil::GetStartOnSystemStartup()) {
        GUIUtil::SetStartOnSystemStartup(false);
    }
}

int OptionsModel::rowCount(const QModelIndex &parent) const {
    return OptionIDRowCount;
}

// read QSettings values and return them
QVariant OptionsModel::data(const QModelIndex &index, int role) const {
    if (role == Qt::EditRole) {
        QSettings settings;
        switch (index.row()) {
            case StartAtStartup:
                return GUIUtil::GetStartOnSystemStartup();
            case HideTrayIcon:
                return fHideTrayIcon;
            case MinimizeToTray:
                return fMinimizeToTray;
            case MapPortUPnP:
#ifdef USE_UPNP
                return settings.value("fUseUPnP");
#else
                return false;
#endif
            case MinimizeOnClose:
                return fMinimizeOnClose;

            // default proxy
            case ProxyUse:
                return settings.value("fUseProxy", false);
            case ProxyIP: {
                // contains IP at index 0 and port at index 1
                QStringList strlIpPort =
                    settings.value("addrProxy")
                        .toString()
                        .split(":", QString::SkipEmptyParts);
                return strlIpPort.at(0);
            }
            case ProxyPort: {
                // contains IP at index 0 and port at index 1
                QStringList strlIpPort =
                    settings.value("addrProxy")
                        .toString()
                        .split(":", QString::SkipEmptyParts);
                return strlIpPort.at(1);
            }

            // separate Tor proxy
            case ProxyUseTor:
                return settings.value("fUseSeparateProxyTor", false);
            case ProxyIPTor: {
                // contains IP at index 0 and port at index 1
                QStringList strlIpPort =
                    settings.value("addrSeparateProxyTor")
                        .toString()
                        .split(":", QString::SkipEmptyParts);
                return strlIpPort.at(0);
            }
            case ProxyPortTor: {
                // contains IP at index 0 and port at index 1
                QStringList strlIpPort =
                    settings.value("addrSeparateProxyTor")
                        .toString()
                        .split(":", QString::SkipEmptyParts);
                return strlIpPort.at(1);
            }

#ifdef ENABLE_WALLET
            case SpendZeroConfChange:
                return settings.value("bSpendZeroConfChange");
#endif
            case DisplayUnit:
                return nDisplayUnit;
            case ThirdPartyTxUrls:
                return strThirdPartyTxUrls;
            case Language:
                return settings.value("language");
            case CoinControlFeatures:
                return fCoinControlFeatures;
            case DatabaseCache:
                return settings.value("nDatabaseCache");
            case ThreadsScriptVerif:
                return settings.value("nThreadsScriptVerif");
            case Listen:
                return settings.value("fListen");
            default:
                return QVariant();
        }
    }
    return QVariant();
}

// write QSettings values
bool OptionsModel::setData(const QModelIndex &index, const QVariant &value,
                           int role) {
    bool successful = true; /* set to false on parse error */
    if (role == Qt::EditRole) {
        QSettings settings;
        switch (index.row()) {
            case StartAtStartup:
                successful = GUIUtil::SetStartOnSystemStartup(value.toBool());
                break;
            case HideTrayIcon:
                fHideTrayIcon = value.toBool();
                settings.setValue("fHideTrayIcon", fHideTrayIcon);
                Q_EMIT hideTrayIconChanged(fHideTrayIcon);
                break;
            case MinimizeToTray:
                fMinimizeToTray = value.toBool();
                settings.setValue("fMinimizeToTray", fMinimizeToTray);
                break;
            case MapPortUPnP: // core option - can be changed on-the-fly
                settings.setValue("fUseUPnP", value.toBool());
                MapPort(value.toBool());
                break;
            case MinimizeOnClose:
                fMinimizeOnClose = value.toBool();
                settings.setValue("fMinimizeOnClose", fMinimizeOnClose);
                break;

            // default proxy
            case ProxyUse:
                if (settings.value("fUseProxy") != value) {
                    settings.setValue("fUseProxy", value.toBool());
                    setRestartRequired(true);
                }
                break;
            case ProxyIP: {
                // contains current IP at index 0 and current port at index 1
                QStringList strlIpPort =
                    settings.value("addrProxy")
                        .toString()
                        .split(":", QString::SkipEmptyParts);
                // if that key doesn't exist or has a changed IP
                if (!settings.contains("addrProxy") ||
                    strlIpPort.at(0) != value.toString()) {
                    // construct new value from new IP and current port
                    QString strNewValue =
                        value.toString() + ":" + strlIpPort.at(1);
                    settings.setValue("addrProxy", strNewValue);
                    setRestartRequired(true);
                }
            } break;
            case ProxyPort: {
                // contains current IP at index 0 and current port at index 1
                QStringList strlIpPort =
                    settings.value("addrProxy")
                        .toString()
                        .split(":", QString::SkipEmptyParts);
                // if that key doesn't exist or has a changed port
                if (!settings.contains("addrProxy") ||
                    strlIpPort.at(1) != value.toString()) {
                    // construct new value from current IP and new port
                    QString strNewValue =
                        strlIpPort.at(0) + ":" + value.toString();
                    settings.setValue("addrProxy", strNewValue);
                    setRestartRequired(true);
                }
            } break;

            // separate Tor proxy
            case ProxyUseTor:
                if (settings.value("fUseSeparateProxyTor") != value) {
                    settings.setValue("fUseSeparateProxyTor", value.toBool());
                    setRestartRequired(true);
                }
                break;
            case ProxyIPTor: {
                // contains current IP at index 0 and current port at index 1
                QStringList strlIpPort =
                    settings.value("addrSeparateProxyTor")
                        .toString()
                        .split(":", QString::SkipEmptyParts);
                // if that key doesn't exist or has a changed IP
                if (!settings.contains("addrSeparateProxyTor") ||
                    strlIpPort.at(0) != value.toString()) {
                    // construct new value from new IP and current port
                    QString strNewValue =
                        value.toString() + ":" + strlIpPort.at(1);
                    settings.setValue("addrSeparateProxyTor", strNewValue);
                    setRestartRequired(true);
                }
            } break;
            case ProxyPortTor: {
                // contains current IP at index 0 and current port at index 1
                QStringList strlIpPort =
                    settings.value("addrSeparateProxyTor")
                        .toString()
                        .split(":", QString::SkipEmptyParts);
                // if that key doesn't exist or has a changed port
                if (!settings.contains("addrSeparateProxyTor") ||
                    strlIpPort.at(1) != value.toString()) {
                    // construct new value from current IP and new port
                    QString strNewValue =
                        strlIpPort.at(0) + ":" + value.toString();
                    settings.setValue("addrSeparateProxyTor", strNewValue);
                    setRestartRequired(true);
                }
            } break;

#ifdef ENABLE_WALLET
            case SpendZeroConfChange:
                if (settings.value("bSpendZeroConfChange") != value) {
                    settings.setValue("bSpendZeroConfChange", value);
                    setRestartRequired(true);
                }
                break;
#endif
            case DisplayUnit:
                setDisplayUnit(value);
                break;
            case ThirdPartyTxUrls:
                if (strThirdPartyTxUrls != value.toString()) {
                    strThirdPartyTxUrls = value.toString();
                    settings.setValue("strThirdPartyTxUrls",
                                      strThirdPartyTxUrls);
                    setRestartRequired(true);
                }
                break;
            case Language:
                if (settings.value("language") != value) {
                    settings.setValue("language", value);
                    setRestartRequired(true);
                }
                break;
            case CoinControlFeatures:
                fCoinControlFeatures = value.toBool();
                settings.setValue("fCoinControlFeatures", fCoinControlFeatures);
                Q_EMIT coinControlFeaturesChanged(fCoinControlFeatures);
                break;
            case DatabaseCache:
                if (settings.value("nDatabaseCache") != value) {
                    settings.setValue("nDatabaseCache", value);
                    setRestartRequired(true);
                }
                break;
            case ThreadsScriptVerif:
                if (settings.value("nThreadsScriptVerif") != value) {
                    settings.setValue("nThreadsScriptVerif", value);
                    setRestartRequired(true);
                }
                break;
            case Listen:
                if (settings.value("fListen") != value) {
                    settings.setValue("fListen", value);
                    setRestartRequired(true);
                }
                break;
            default:
                break;
        }
    }

    Q_EMIT dataChanged(index, index);

    return successful;
}

/** Updates current unit in memory, settings and emits
 * displayUnitChanged(newUnit) signal */
void OptionsModel::setDisplayUnit(const QVariant &value) {
    if (!value.isNull()) {
        QSettings settings;
        nDisplayUnit = value.toInt();
        settings.setValue("nDisplayUnit", nDisplayUnit);
        Q_EMIT displayUnitChanged(nDisplayUnit);
    }
}

bool OptionsModel::getProxySettings(QNetworkProxy &proxy) const {
    // Directly query current base proxy, because
    // GUI settings can be overridden with -proxy.
    proxyType curProxy;
    if (GetProxy(NET_IPV4, curProxy)) {
        proxy.setType(QNetworkProxy::Socks5Proxy);
        proxy.setHostName(QString::fromStdString(curProxy.proxy.ToStringIP()));
        proxy.setPort(curProxy.proxy.GetPort());

        return true;
    } else
        proxy.setType(QNetworkProxy::NoProxy);

    return false;
}

void OptionsModel::setRestartRequired(bool fRequired) {
    QSettings settings;
    return settings.setValue("fRestartRequired", fRequired);
}

bool OptionsModel::isRestartRequired() {
    QSettings settings;
    return settings.value("fRestartRequired", false).toBool();
}

void OptionsModel::checkAndMigrate() {
    // Migration of default values
    // Check if the QSettings container was already loaded with this client
    // version
    QSettings settings;
    static const char strSettingsVersionKey[] = "nSettingsVersion";
    int settingsVersion = settings.contains(strSettingsVersionKey)
                              ? settings.value(strSettingsVersionKey).toInt()
                              : 0;
    if (settingsVersion < CLIENT_VERSION) {
        // -dbcache was bumped from 100 to 300 in 0.13
        // see https://github.com/bitcoin/bitcoin/pull/8273
        // force people to upgrade to the new value if they are using 100MB
        if (settingsVersion < 130000 && settings.contains("nDatabaseCache") &&
            settings.value("nDatabaseCache").toLongLong() == 100)
            settings.setValue("nDatabaseCache", (qint64)nDefaultDbCache);

        settings.setValue(strSettingsVersionKey, CLIENT_VERSION);
    }
}
