namespace Distribution.Features.Notifications;

public enum ScopeKind { Region, Route, Store }

/// <summary>
/// Who a notification goes to. There is deliberately no "everyone" rule — every trigger must say who
/// needs to know. Scope coverage follows Region → Route → Store: a region scope covers its routes
/// and their stores, a route scope covers its stores.
/// </summary>
public abstract record RecipientRule
{
    /// <summary>These specific users (creator, driver, approver, route owner …).</summary>
    public static RecipientRule Users(params Guid[] ids) => new UsersRule(ids);

    /// <summary>Every active user whose role holds the permission code.</summary>
    public static RecipientRule Permission(string code) => new PermissionRule(code);

    /// <summary>Every active user whose scope covers the region / route / store.</summary>
    public static RecipientRule Scope(ScopeKind kind, Guid id) => new ScopeRule(kind, id);

    /// <summary>Users who hold the permission AND whose scope covers the region / route / store.</summary>
    public static RecipientRule PermissionInScope(string code, ScopeKind kind, Guid id) =>
        new PermissionInScopeRule(code, kind, id);

    /// <summary>The user's supervisor (User.FK_ReportsToUserId).</summary>
    public static RecipientRule ReportsTo(Guid userId) => new ReportsToRule(userId);

    /// <summary>The owner of the route (<see cref="ScopeKind.Route"/>) or of the store's route (<see cref="ScopeKind.Store"/>).</summary>
    public static RecipientRule RouteOwner(ScopeKind kind, Guid id) => new RouteOwnerRule(kind, id);
}

public sealed record UsersRule(IReadOnlyCollection<Guid> Ids) : RecipientRule;
public sealed record PermissionRule(string Code) : RecipientRule;
public sealed record ScopeRule(ScopeKind Kind, Guid Id) : RecipientRule;
public sealed record PermissionInScopeRule(string Code, ScopeKind Kind, Guid Id) : RecipientRule;
public sealed record ReportsToRule(Guid UserId) : RecipientRule;
public sealed record RouteOwnerRule(ScopeKind Kind, Guid Id) : RecipientRule;