#include "Credential.hpp"

#include <QDateTime>
#include <QEventLoop>

#include <keychain.h>

namespace geopro::app {

namespace {

const QString kService = QStringLiteral("Geopro3");
const QString kKey = QStringLiteral("session");

// QtKeychain 的 job 是异步的；用局部事件循环跑成同步（启动/登录时一次性调用，可接受）。
QString readRaw()
{
    QKeychain::ReadPasswordJob job(kService);
    job.setAutoDelete(false);
    job.setKey(kKey);
    QEventLoop loop;
    QObject::connect(&job, &QKeychain::Job::finished, &loop, &QEventLoop::quit);
    job.start();
    loop.exec();
    if (job.error() != QKeychain::NoError) return {};
    return job.textData();
}

}  // namespace

void rememberSession(const QString& token)
{
    if (token.isEmpty()) return;
    const QString payload =
        QString::number(QDateTime::currentSecsSinceEpoch()) + QStringLiteral("|") + token;

    QKeychain::WritePasswordJob job(kService);
    job.setAutoDelete(false);
    job.setKey(kKey);
    job.setTextData(payload);
    QEventLoop loop;
    QObject::connect(&job, &QKeychain::Job::finished, &loop, &QEventLoop::quit);
    job.start();
    loop.exec();
}

QString recallValidToken(int maxAgeDays)
{
    const QString raw = readRaw();
    if (raw.isEmpty()) return {};
    const int sep = raw.indexOf(QLatin1Char('|'));
    if (sep <= 0) return {};

    bool ok = false;
    const qint64 ts = raw.left(sep).toLongLong(&ok);
    if (!ok) return {};

    const qint64 ageSec = QDateTime::currentSecsSinceEpoch() - ts;
    if (ageSec < 0 || ageSec > static_cast<qint64>(maxAgeDays) * 24 * 3600) return {};
    return raw.mid(sep + 1);
}

void forgetSession()
{
    QKeychain::DeletePasswordJob job(kService);
    job.setAutoDelete(false);
    job.setKey(kKey);
    QEventLoop loop;
    QObject::connect(&job, &QKeychain::Job::finished, &loop, &QEventLoop::quit);
    job.start();
    loop.exec();
}

}  // namespace geopro::app