// OptionsDialog::diffChanged unit tests. Lane GUI.
//
// Red when a key that didn't actually change starts getting resent to settings.set (it
// would still work, but it defeats the fixture's "changed[] names exactly what took
// effect" contract and spams event.settings.changed with noise), or a key present in
// `current` but absent from `original` stops being treated as changed.

#include <QFile>
#include <QJsonDocument>
#include <QJsonObject>
#include <QtTest>

#include "dialogs/OptionsDialog.hpp"

using velox::gui::OptionsDialog;

class TstOptionsDialog : public QObject {
    Q_OBJECT

  private slots:
    void identicalValuesProduceNoDiff();
    void onlyChangedKeysAreReturned();
    void keyAbsentFromOriginalCountsAsChanged();
    void allKeysAreNonEmptyAndUnique();
    void allKeysMatchesTheSchemaExactly();
};

void TstOptionsDialog::identicalValuesProduceNoDiff() {
    const QJsonObject original{{"connection.timeoutSec", 30}, {"proxy.mode", "system"}};
    const QJsonObject current = original;
    QVERIFY(OptionsDialog::diffChanged(original, current).isEmpty());
}

void TstOptionsDialog::onlyChangedKeysAreReturned() {
    const QJsonObject original{{"connection.timeoutSec", 30}, {"proxy.mode", "system"}};
    const QJsonObject current{{"connection.timeoutSec", 60}, {"proxy.mode", "system"}};
    const QJsonObject changed = OptionsDialog::diffChanged(original, current);
    QCOMPARE(changed.size(), 1);
    QCOMPARE(changed.value("connection.timeoutSec").toInt(), 60);
}

void TstOptionsDialog::keyAbsentFromOriginalCountsAsChanged() {
    const QJsonObject original{{"proxy.mode", "system"}};
    const QJsonObject current{{"proxy.mode", "system"}, {"proxy.port", 1080}};
    const QJsonObject changed = OptionsDialog::diffChanged(original, current);
    QCOMPARE(changed.size(), 1);
    QVERIFY(changed.contains("proxy.port"));
}

void TstOptionsDialog::allKeysAreNonEmptyAndUnique() {
    const QStringList keys = OptionsDialog::allKeys();
    QVERIFY(!keys.isEmpty());
    QCOMPARE(QSet<QString>(keys.begin(), keys.end()).size(), keys.size());
}

// Red when a key is added to (or removed from) Settings.schema.json without the same
// change landing here — either direction is a real bug: an invented key settings.set
// would reject with -32602, or a real key the dialog silently never shows.
void TstOptionsDialog::allKeysMatchesTheSchemaExactly() {
    QFile f(QStringLiteral(VELOX_REPO_ROOT "/contracts/schema/types/Settings.schema.json"));
    QVERIFY2(f.open(QIODevice::ReadOnly), qUtf8Printable(f.errorString()));
    const QJsonObject schema = QJsonDocument::fromJson(f.readAll()).object();
    const QJsonObject properties = schema.value("properties").toObject();
    QVERIFY(!properties.isEmpty());

    QSet<QString> schemaKeys;
    for (auto it = properties.constBegin(); it != properties.constEnd(); ++it) {
        schemaKeys.insert(it.key());
    }
    const QStringList dialogKeysList = OptionsDialog::allKeys();
    const QSet<QString> dialogKeys(dialogKeysList.begin(), dialogKeysList.end());
    QCOMPARE(dialogKeys, schemaKeys);
}

QTEST_MAIN(TstOptionsDialog)
#include "tst_optionsdialog.moc"