#pragma once

#include "db/database_manager.h"
#include <string>

namespace radiantwave::license {

enum class Result {
    Ok,            // license valid; subscription active
    NotConfigured, // email and/or license key missing from the DB
    Invalid,       // API rejected the pair (bad key, wrong user, inactive, ...)
    NetworkError,  // the request never completed
};

// How long a previously-validated license stays valid without a successful
// re-validation (7 days). Network failures within this window after the last
// successful check do not invalidate the license; the user has the whole
// window to reconnect so the "last verified" stamp can be refreshed.
constexpr long long GRACE_PERIOD_SECONDS = 7LL * 24 * 60 * 60;

// Validates the stored license key against the stored email address via the
// portal API. A successful validation is the device's "subscribed" flag — no
// separate subscription state is tracked. On failure nothing is written, so a
// previous good value survives a transient outage. Returns NotConfigured
// without touching the network when either value is missing. Never throws.
//
// `outErrorMessage` is an optional out-param.
Result validateStoredLicense(radiantwave::db::DatabaseManager& db,
                             std::string* outErrorMessage = nullptr);

// Records the current time as the "last verified" stamp of the license. Called
// after every successful server validation so the offline grace window starts
// (or is extended) from the most recent confirmation.
void markLicenseVerified(radiantwave::db::DatabaseManager& db);

// True when a prior successful validation happened within
// GRACE_PERIOD_SECONDS of now. Returns false when no stamp is stored or the
// stamp is corrupted or older than the grace window.
bool isLicenseWithinGracePeriod(const radiantwave::db::DatabaseManager& db);

} // namespace radiantwave::license