// Copyright (c) 2011-2016 The Bitcoin Core developers
// Copyright (c) 2021 The Bitcoin 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 <qt/optionsmodel.h>

#include <amount.h>
#include <interfaces/node.h>
#include <mapport.h>
#include <net.h>
#include <netbase.h>
#include <qt/bitcoinunits.h>
#include <qt/guiutil.h>
#include <qt/intro.h>
#include <txdb.h>       // for -dbcache defaults
#include <validation.h> // For DEFAULT_SCRIPTCHECK_THREADS

#include <QDebug>
#include <QSettings>
#include <QStringList>
#include <QUrl>

const char *DEFAULT_GUI_PROXY_HOST = "127.0.0.1";

static const QString GetDefaultProxyAddress();

OptionsModel::OptionsModel(interfaces::Node &node, QObject *parent,
                           bool resetSettings)
    : QAbstractListModel(parent), m_node(node) {
    Init(resetSettings);
}

void OptionsModel::addOverriddenOption(const std::string &option) {
    strOverriddenByCommandLine +=
        QString::fromStdString(option) + "=" +
        QString::fromStdString(gArgs.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
    constexpr auto defaultDisplayUnit = BitcoinUnits::BCH;
    if (!settings.contains("nDisplayUnit_v2")) {
        settings.setValue("nDisplayUnit_v2", defaultDisplayUnit);
    }
    nDisplayUnit = settings.value("nDisplayUnit_v2").toInt();
    if (!BitcoinUnits::valid(nDisplayUnit)) {
        // User might be running us after having run a new version that saved
        // a unit we don't know about, so just default back to BCH.
        qWarning() << "Unrecognized display unit (" << nDisplayUnit << ") read from settings, setting display unit back to"
                   <<  BitcoinUnits::ticker(defaultDisplayUnit);
        nDisplayUnit = defaultDisplayUnit;
    }

    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 gArgs.SoftSetArg() or gArgs.SoftSetBoolArg() return false we were
    // overridden
    // by command-line and show this in the UI.

    // Main
    if (!settings.contains("bPrune")) {
        settings.setValue("bPrune", false);
    }
    if (!settings.contains("nPruneSize")) {
        settings.setValue("nPruneSize", 2);
    }
    // Convert prune size to MB:
    const uint64_t nPruneSizeMB = settings.value("nPruneSize").toInt() * 1000;
    if (!m_node.softSetArg("-prune", settings.value("bPrune").toBool()
                                         ? std::to_string(nPruneSizeMB)
                                         : "0")) {
        addOverriddenOption("-prune");
    }

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

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

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

// Wallet
#ifdef ENABLE_WALLET
    settings.setValue("fAllowLegacyP2SH", gArgs.GetBoolArg("-allowlegacyp2sh", false));
    if (!settings.contains("bSpendZeroConfChange")) {
        settings.setValue("bSpendZeroConfChange", true);
    }
    if (!m_node.softSetBoolArg(
            "-spendzeroconfchange",
            settings.value("bSpendZeroConfChange").toBool())) {
        addOverriddenOption("-spendzeroconfchange");
    }
    if (!settings.contains("fAllowLegacyP2PKH")) {
        settings.setValue("fAllowLegacyP2PKH", false);
    }

#endif

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

    if (!settings.contains("fUseNatpmp")) {
        settings.setValue("fUseNatpmp", DEFAULT_NATPMP);
    }
    if (!m_node.softSetBoolArg("-natpmp", settings.value("fUseNatpmp").toBool())) {
        addOverriddenOption("-natpmp");
    }

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

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

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

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

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

/**
 * Helper function to copy contents from one QSettings to another.
 * By using allKeys this also covers nested settings in a hierarchy.
 */
static void CopySettings(QSettings &dst, const QSettings &src) {
    for (const QString &key : src.allKeys()) {
        dst.setValue(key, src.value(key));
    }
}

/** Back up a QSettings to an ini-formatted file. */
static void BackupSettings(const fs::path &filename, const QSettings &src) {
    qWarning() << "Backing up GUI settings to"
               << GUIUtil::boostPathToQString(filename);
    QSettings dst(GUIUtil::boostPathToQString(filename), QSettings::IniFormat);
    dst.clear();
    CopySettings(dst, src);
}

void OptionsModel::Reset() {
    QSettings settings;

    // Backup old settings to chain-specific datadir for troubleshooting
    BackupSettings(GetDataDir(true) / "guisettings.ini.bak", 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;
}

struct ProxySetting {
    bool is_set;
    QString ip;
    QString port;
};

static ProxySetting GetProxySetting(QSettings &settings, const QString &name) {
    static const ProxySetting default_val = {
        false, DEFAULT_GUI_PROXY_HOST,
        QString("%1").arg(DEFAULT_GUI_PROXY_PORT)};
    // Handle the case that the setting is not set at all
    if (!settings.contains(name)) {
        return default_val;
    }
    // contains IP at index 0 and port at index 1
    QStringList ip_port =
        GUIUtil::splitSkipEmptyParts(settings.value(name).toString(), ":");
    if (ip_port.size() == 2) {
        return {true, ip_port.at(0), ip_port.at(1)};
    } else { // Invalid: return default
        return default_val;
    }
}

static void SetProxySetting(QSettings &settings, const QString &name,
                            const ProxySetting &ip_port) {
    settings.setValue(name, ip_port.ip + ":" + ip_port.port);
}

static const QString GetDefaultProxyAddress() {
    return QString("%1:%2")
        .arg(DEFAULT_GUI_PROXY_HOST)
        .arg(DEFAULT_GUI_PROXY_PORT);
}

// 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 // USE_UPNP
            case MapPortNatpmp:
#ifdef USE_NATPMP
                return settings.value("fUseNatpmp");
#else
                return false;
#endif // USE_NATPMP
            case MinimizeOnClose:
                return fMinimizeOnClose;

            // default proxy
            case ProxyUse:
                return settings.value("fUseProxy", false);
            case ProxyIP:
                return GetProxySetting(settings, "addrProxy").ip;
            case ProxyPort:
                return GetProxySetting(settings, "addrProxy").port;

            // separate Tor proxy
            case ProxyUseTor:
                return settings.value("fUseSeparateProxyTor", false);
            case ProxyIPTor:
                return GetProxySetting(settings, "addrSeparateProxyTor").ip;
            case ProxyPortTor:
                return GetProxySetting(settings, "addrSeparateProxyTor").port;

#ifdef ENABLE_WALLET
            case SpendZeroConfChange:
                return settings.value("bSpendZeroConfChange");
            case AllowLegacyP2PKH:
                return settings.value("fAllowLegacyP2PKH");
#endif
            case DisplayUnit:
                return nDisplayUnit;
            case ThirdPartyTxUrls:
                return strThirdPartyTxUrls;
            case Language:
                return settings.value("language");
            case CoinControlFeatures:
                return fCoinControlFeatures;
            case Prune:
                return settings.value("bPrune");
            case PruneSize:
                return settings.value("nPruneSize");
            case DatabaseCache:
                return settings.value("nDatabaseCache");
            case ThreadsScriptVerif:
                return settings.value("nThreadsScriptVerif");
            case Listen:
                return settings.value("fListen");
            default:
                return QVariant();
        }
    }
    return QVariant();
}

bool OptionsModel::isValidThirdPartyTxUrlString(QString value)
{
    // Check that the URLs are valid, and https or https.
    // Requiring http(s) ensures that certain schemes that auto-execute
    // cannot be used.  Although the user would need to explicitly
    // configure such to happen, preventing this configuration protects
    // the average user.
    QStringList listUrls = GUIUtil::splitSkipEmptyParts(value, "|");
    for (auto &urlStr : listUrls) {
        // Remove whitespace and replace our tx placeholder with some
        // valid URL data for validity checking.
        const QUrl url(urlStr.replace("%s", "tx").trimmed(), QUrl::StrictMode);
        if (!url.isValid() || (url.scheme().toLower() != "https" && url.scheme().toLower() != "http")) {
            return false;
        }
    }
    return true;
}

// 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());
                break;
            case MapPortNatpmp: // core option - can be changed on-the-fly
                settings.setValue("fUseNatpmp", 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: {
                auto ip_port = GetProxySetting(settings, "addrProxy");
                if (!ip_port.is_set || ip_port.ip != value.toString()) {
                    ip_port.ip = value.toString();
                    SetProxySetting(settings, "addrProxy", ip_port);
                    setRestartRequired(true);
                }
            } break;
            case ProxyPort: {
                auto ip_port = GetProxySetting(settings, "addrProxy");
                if (!ip_port.is_set || ip_port.port != value.toString()) {
                    ip_port.port = value.toString();
                    SetProxySetting(settings, "addrProxy", ip_port);
                    setRestartRequired(true);
                }
            } break;

            // separate Tor proxy
            case ProxyUseTor:
                if (settings.value("fUseSeparateProxyTor") != value) {
                    settings.setValue("fUseSeparateProxyTor", value.toBool());
                    setRestartRequired(true);
                }
                break;
            case ProxyIPTor: {
                auto ip_port =
                    GetProxySetting(settings, "addrSeparateProxyTor");
                if (!ip_port.is_set || ip_port.ip != value.toString()) {
                    ip_port.ip = value.toString();
                    SetProxySetting(settings, "addrSeparateProxyTor", ip_port);
                    setRestartRequired(true);
                }
            } break;
            case ProxyPortTor: {
                auto ip_port =
                    GetProxySetting(settings, "addrSeparateProxyTor");
                if (!ip_port.is_set || ip_port.port != value.toString()) {
                    ip_port.port = value.toString();
                    SetProxySetting(settings, "addrSeparateProxyTor", ip_port);
                    setRestartRequired(true);
                }
            } break;

#ifdef ENABLE_WALLET
            case SpendZeroConfChange:
                if (settings.value("bSpendZeroConfChange") != value) {
                    settings.setValue("bSpendZeroConfChange", value);
                    setRestartRequired(true);
                }
                break;
            case AllowLegacyP2PKH:
                settings.setValue("fAllowLegacyP2PKH", value);
                break;
#endif
            case DisplayUnit:
                setDisplayUnit(value);
                break;
            case ThirdPartyTxUrls:
                if (strThirdPartyTxUrls != value.toString()) {
                    if (isValidThirdPartyTxUrlString(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 Prune:
                if (settings.value("bPrune") != value) {
                    settings.setValue("bPrune", value);
                    setRestartRequired(true);
                }
                break;
            case PruneSize:
                if (settings.value("nPruneSize") != value) {
                    settings.setValue("nPruneSize", value);
                    setRestartRequired(true);
                }
                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_v2", nDisplayUnit);
        Q_EMIT displayUnitChanged(nDisplayUnit);
    }
}

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

bool OptionsModel::isRestartRequired() const {
    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);
    }

    // Overwrite the 'addrProxy' setting in case it has been set to an illegal
    // default value (see issue #12623; PR #12650).
    if (settings.contains("addrProxy") &&
        settings.value("addrProxy").toString().endsWith("%2")) {
        settings.setValue("addrProxy", GetDefaultProxyAddress());
    }

    // Overwrite the 'addrSeparateProxyTor' setting in case it has been set to
    // an illegal default value (see issue #12623; PR #12650).
    if (settings.contains("addrSeparateProxyTor") &&
        settings.value("addrSeparateProxyTor").toString().endsWith("%2")) {
        settings.setValue("addrSeparateProxyTor", GetDefaultProxyAddress());
    }

    // Previous to version 0.21.1, we called this config key "nDisplayUnit",
    // but then we subsequently renamed it to "nDiplayUnit_v2" after adding the
    // Satoshi (sats) unit type. See issue #47.
    if (settings.contains("nDisplayUnit") && !settings.contains("nDisplayUnit_v2")) {
        const int oldVal = settings.value("nDisplayUnit").toInt();
        if (BitcoinUnits::valid(oldVal))
            // legacy value is valid, use it.
            settings.setValue("nDisplayUnit_v2", oldVal);
    }
}
