// wireguardconfig.cpp

#include "wireguardconfig.h"

// ─── Factory ──────────────────────────────────────────────────────────────────

WireGuardConfig WireGuardConfig::fromConf(const QString &conf)
{
    WireGuardConfig cfg;
    QString section;

    for (const QString &rawLine : conf.split(QLatin1Char('\n'))) {
        const QString line = rawLine.trimmed();
        if (line.isEmpty() || line.startsWith(QLatin1Char('#')))
            continue;

        // Section header: [Interface] or [Peer]
        if (line.startsWith(QLatin1Char('['))) {
            const int close = line.indexOf(QLatin1Char(']'));
            section = (close > 1) ? line.mid(1, close - 1).toLower() : QString();
            continue;
        }

        const int eq = line.indexOf(QLatin1Char('='));
        if (eq < 1) continue;

        const QString key = line.left(eq).trimmed().toLower();
        const QString val = line.mid(eq + 1).trimmed();

        if (section == QLatin1String("interface")) {
            if      (key == QLatin1String("privatekey")) cfg.privateKey = val;
            else if (key == QLatin1String("address"))    cfg.address    = val;
            else if (key == QLatin1String("dns"))        cfg.dns        = val;

        } else if (section == QLatin1String("peer")) {
            if      (key == QLatin1String("publickey"))            cfg.peerPublicKey = val;
            else if (key == QLatin1String("presharedkey"))         cfg.presharedKey  = val;
            else if (key == QLatin1String("endpoint"))             cfg.endpoint      = val;
            else if (key == QLatin1String("allowedips")) {
                cfg.allowedIPs.clear();
                for (const QString &part : val.split(QLatin1Char(',')))
                    cfg.allowedIPs << part.trimmed();
            }
            else if (key == QLatin1String("persistentkeepalive"))
                cfg.persistentKeepalive = static_cast<uint16_t>(val.toUInt());
        }
    }

    return cfg;
}

// ─── Helpers ──────────────────────────────────────────────────────────────────

QString WireGuardConfig::endpointHost() const
{
    // Handle IPv6 [::1]:port notation
    if (endpoint.startsWith(QLatin1Char('['))) {
        const int close = endpoint.indexOf(QLatin1Char(']'));
        if (close > 0) return endpoint.mid(1, close - 1);
    }
    const int colon = endpoint.lastIndexOf(QLatin1Char(':'));
    return (colon > 0) ? endpoint.left(colon) : endpoint;
}

quint16 WireGuardConfig::endpointPort() const
{
    if (endpoint.startsWith(QLatin1Char('['))) {
        const int bracketClose = endpoint.indexOf(QLatin1Char(']'));
        const int colon = endpoint.indexOf(QLatin1Char(':'), bracketClose);
        if (colon > 0) return static_cast<quint16>(endpoint.mid(colon + 1).toUInt());
        return 51820;
    }
    const int colon = endpoint.lastIndexOf(QLatin1Char(':'));
    return (colon > 0) ? static_cast<quint16>(endpoint.mid(colon + 1).toUInt()) : 51820;
}

QString WireGuardConfig::localIP() const
{
    const int slash = address.indexOf(QLatin1Char('/'));
    return (slash > 0) ? address.left(slash) : address;
}

bool WireGuardConfig::isValid() const
{
    return !privateKey.isEmpty()
        && !peerPublicKey.isEmpty()
        && !endpoint.isEmpty()
        && !address.isEmpty();
}