namespace ZB.MOM.WW.ScadaBridge.Commons.Messages.Management;

/// <summary>
/// Read-only response for <see cref="GetResolvedTemplateMembersCommand"/>: the
/// EFFECTIVE inherited member set for a template, computed fresh from the full
/// inheritance chain (root → leaf, arbitrary depth) and annotated per member
/// with its origin and lock state — plus a staleness summary comparing the
/// template's STORED member rows against this freshly-resolved set.
/// </summary>
/// <remarks>
/// <para>
/// The precedence used to compute the effective member set MIRRORS
/// <c>FlatteningService.ResolveInherited*</c> exactly (derived wins;
/// <c>IsInherited</c> placeholders never shadow the live base value; locked
/// members flagged), so the editor preview agrees with what a deploy would
/// produce. This is the AUTHORING view only — it never mutates stored rows and
/// is not on the deploy path.
/// </para>
/// <para>
/// Member values surfaced here are the inheritance-resolved values BEFORE any
/// composition or instance override is applied — composition is a separate
/// concern owned by the instance flattener, and there are no instances in the
/// template-authoring context.
/// </para>
/// </remarks>
public sealed record ResolvedTemplateMembers
{
    /// <summary>The template the member set was resolved for.</summary>
    public int TemplateId { get; init; }
    /// <summary>The template's name.</summary>
    public string TemplateName { get; init; } = string.Empty;
    /// <summary>The immediate parent template id, or null when this is a root template.</summary>
    public int? ParentTemplateId { get; init; }

    /// <summary>The effective resolved attributes (own + transitively inherited).</summary>
    public IReadOnlyList<ResolvedTemplateMemberInfo> Attributes { get; init; } = [];
    /// <summary>The effective resolved alarms (own + transitively inherited).</summary>
    public IReadOnlyList<ResolvedTemplateMemberInfo> Alarms { get; init; } = [];
    /// <summary>The effective resolved scripts (own + transitively inherited).</summary>
    public IReadOnlyList<ResolvedTemplateMemberInfo> Scripts { get; init; } = [];
    /// <summary>The effective resolved native alarm source bindings (own + transitively inherited).</summary>
    public IReadOnlyList<ResolvedTemplateMemberInfo> NativeAlarmSources { get; init; } = [];

    /// <summary>
    /// Staleness summary: whether the template's stored member rows differ from
    /// this freshly-resolved set (e.g. a base member added after the derived
    /// template was created, or a multi-level inherited member not present in
    /// the stored rows), and how many inherited members differ.
    /// </summary>
    public ResolvedTemplateStaleness Staleness { get; init; } = new();
}

/// <summary>
/// One effective member in a <see cref="ResolvedTemplateMembers"/> set,
/// annotated with where its winning definition came from and its lock state.
/// </summary>
public sealed record ResolvedTemplateMemberInfo
{
    /// <summary>The member name (bare; inheritance-resolved members are never path-qualified).</summary>
    public string Name { get; init; } = string.Empty;

    /// <summary>
    /// True when the winning definition lives on an ANCESTOR template rather
    /// than on the resolved template itself — i.e. this member is inherited.
    /// </summary>
    public bool IsInherited { get; init; }

    /// <summary>The id of the template that supplied the winning definition.</summary>
    public int OriginTemplateId { get; init; }
    /// <summary>The name of the template that supplied the winning definition.</summary>
    public string OriginTemplateName { get; init; } = string.Empty;

    /// <summary>
    /// True when the member is locked from override (<c>IsLocked</c> on the
    /// winning row) — a derived template cannot change it.
    /// </summary>
    public bool IsLocked { get; init; }

    /// <summary>
    /// True when an ANCESTOR marked this member <c>LockedInDerived</c> — the
    /// derived template may not override it (rendered read-only with a lock in
    /// the editor). Distinct from <see cref="IsLocked"/>: a base may forbid
    /// override (<c>LockedInDerived</c>) without the member itself being a
    /// locked composition member.
    /// </summary>
    public bool IsBaseLocked { get; init; }

    /// <summary>
    /// The effective value for the member, type-appropriate: attribute value,
    /// script code, alarm priority/trigger summary, or native-source reference.
    /// Provided so the editor preview shows the live (post-resolution) value
    /// without re-walking the chain itself. Null when the member type carries
    /// no single scalar value.
    /// </summary>
    public string? EffectiveValue { get; init; }

    /// <summary>
    /// For ALARM members only: the effective (inheritance-resolved) trigger
    /// configuration JSON — for HiLo alarms this is the per-setpoint MERGED
    /// config (a derived template overriding only <c>hi</c> inherits the base
    /// <c>lo</c>), identical to what the flattener produces on deploy, so the
    /// editor can render the effective HiLo thresholds. Null for non-alarm
    /// members and for alarms with no trigger configuration.
    /// </summary>
    public string? EffectiveTriggerConfiguration { get; init; }
}

/// <summary>
/// Staleness summary comparing a template's STORED member rows against the
/// freshly-resolved inherited member set.
/// </summary>
public sealed record ResolvedTemplateStaleness
{
    /// <summary>
    /// True when the stored derived rows differ from the freshly-resolved set —
    /// the base changed after the derived template was created, so the editor
    /// should surface a "base changed" banner.
    /// </summary>
    public bool IsStale { get; init; }

    /// <summary>
    /// The number of inherited members whose freshly-resolved state differs
    /// from what the stored rows reflect (missing rows, added base members,
    /// changed inherited values). This is the count the editor banner shows.
    /// </summary>
    public int DifferingMemberCount { get; init; }
}