namespace SQLInsight.Licensing;

public enum LicensePlan
{
    Community,
    Professional,
    Enterprise,
}

/// <summary>
/// What a license grants. SQLInsight Pro monitors everything without a license; a license adds findings sync to
/// SQLInsight Hub and records the support agreement.
/// </summary>
public sealed record License
{
    public required string LicenseId { get; init; }
    public required string Customer { get; init; }
    public required LicensePlan Plan { get; init; }
    public required DateTimeOffset IssuedAt { get; init; }
    public required DateTimeOffset ExpiresAt { get; init; }

    /// <summary>How many instances may sync findings to the hub. 0 means unlimited.</summary>
    public int MaxInstances { get; init; }

    /// <summary>Id of the key that signed the license (for key rotation).</summary>
    public required string KeyId { get; init; }

    public bool IncludesFindingsSync => Plan is LicensePlan.Professional or LicensePlan.Enterprise;
    public bool IncludesPrioritySupport => Plan is LicensePlan.Professional or LicensePlan.Enterprise;
    public bool IncludesPhoneSupport => Plan is LicensePlan.Enterprise;
}

public enum LicenseState
{
    /// <summary>No license configured: Community.</summary>
    None,
    Valid,

    /// <summary>Expired, but within the grace period: everything still works; renew soon.</summary>
    ExpiredInGrace,

    Expired,

    /// <summary>The signature does not match, the key is unknown, or the text is damaged.</summary>
    Invalid,
}

public sealed record LicenseStatus(LicenseState State, License? License, string Message)
{
    /// <summary>Findings may be synced while the license is valid or in grace.</summary>
    public bool AllowsFindingsSync => State is LicenseState.Valid or LicenseState.ExpiredInGrace && License!.IncludesFindingsSync;
}