using System.Text.Json.Serialization;
using StellaOps.Policy.RiskProfile.Lifecycle;

namespace StellaOps.Policy.Engine.Events;

/// <summary>
/// Base class for profile lifecycle events.
/// </summary>
public abstract record ProfileEvent(
    [property: JsonPropertyName("event_id")] string EventId,
    [property: JsonPropertyName("event_type")] ProfileEventType EventType,
    [property: JsonPropertyName("profile_id")] string ProfileId,
    [property: JsonPropertyName("profile_version")] string ProfileVersion,
    [property: JsonPropertyName("timestamp")] DateTimeOffset Timestamp,
    [property: JsonPropertyName("actor")] string? Actor,
    [property: JsonPropertyName("correlation_id")] string? CorrelationId);

/// <summary>
/// Type of profile event.
/// </summary>
[JsonConverter(typeof(JsonStringEnumConverter<ProfileEventType>))]
public enum ProfileEventType
{
    [JsonPropertyName("profile_created")]
    ProfileCreated,

    [JsonPropertyName("profile_published")]
    ProfilePublished,

    [JsonPropertyName("profile_activated")]
    ProfileActivated,

    [JsonPropertyName("profile_deprecated")]
    ProfileDeprecated,

    [JsonPropertyName("profile_archived")]
    ProfileArchived,

    [JsonPropertyName("severity_threshold_changed")]
    SeverityThresholdChanged,

    [JsonPropertyName("weight_changed")]
    WeightChanged,

    [JsonPropertyName("override_added")]
    OverrideAdded,

    [JsonPropertyName("override_removed")]
    OverrideRemoved,

    [JsonPropertyName("scope_attached")]
    ScopeAttached,

    [JsonPropertyName("scope_detached")]
    ScopeDetached
}

/// <summary>
/// Event emitted when a profile is created.
/// </summary>
public sealed record ProfileCreatedEvent(
    string EventId,
    string ProfileId,
    string ProfileVersion,
    DateTimeOffset Timestamp,
    string? Actor,
    string? CorrelationId,
    [property: JsonPropertyName("content_hash")] string ContentHash,
    [property: JsonPropertyName("description")] string? Description)
    : ProfileEvent(EventId, ProfileEventType.ProfileCreated, ProfileId, ProfileVersion, Timestamp, Actor, CorrelationId);

/// <summary>
/// Event emitted when a profile is published/activated.
/// </summary>
public sealed record ProfilePublishedEvent(
    string EventId,
    string ProfileId,
    string ProfileVersion,
    DateTimeOffset Timestamp,
    string? Actor,
    string? CorrelationId,
    [property: JsonPropertyName("content_hash")] string ContentHash,
    [property: JsonPropertyName("previous_active_version")] string? PreviousActiveVersion)
    : ProfileEvent(EventId, ProfileEventType.ProfilePublished, ProfileId, ProfileVersion, Timestamp, Actor, CorrelationId);

/// <summary>
/// Event emitted when a profile is deprecated.
/// </summary>
public sealed record ProfileDeprecatedEvent(
    string EventId,
    string ProfileId,
    string ProfileVersion,
    DateTimeOffset Timestamp,
    string? Actor,
    string? CorrelationId,
    [property: JsonPropertyName("reason")] string? Reason,
    [property: JsonPropertyName("successor_version")] string? SuccessorVersion)
    : ProfileEvent(EventId, ProfileEventType.ProfileDeprecated, ProfileId, ProfileVersion, Timestamp, Actor, CorrelationId);

/// <summary>
/// Event emitted when a profile is archived.
/// </summary>
public sealed record ProfileArchivedEvent(
    string EventId,
    string ProfileId,
    string ProfileVersion,
    DateTimeOffset Timestamp,
    string? Actor,
    string? CorrelationId)
    : ProfileEvent(EventId, ProfileEventType.ProfileArchived, ProfileId, ProfileVersion, Timestamp, Actor, CorrelationId);

/// <summary>
/// Event emitted when severity thresholds change.
/// </summary>
public sealed record SeverityThresholdChangedEvent(
    string EventId,
    string ProfileId,
    string ProfileVersion,
    DateTimeOffset Timestamp,
    string? Actor,
    string? CorrelationId,
    [property: JsonPropertyName("changes")] IReadOnlyList<ThresholdChange> Changes)
    : ProfileEvent(EventId, ProfileEventType.SeverityThresholdChanged, ProfileId, ProfileVersion, Timestamp, Actor, CorrelationId);

/// <summary>
/// Details of a threshold change.
/// </summary>
public sealed record ThresholdChange(
    [property: JsonPropertyName("threshold_name")] string ThresholdName,
    [property: JsonPropertyName("old_value")] double? OldValue,
    [property: JsonPropertyName("new_value")] double? NewValue);

/// <summary>
/// Event emitted when weights change.
/// </summary>
public sealed record WeightChangedEvent(
    string EventId,
    string ProfileId,
    string ProfileVersion,
    DateTimeOffset Timestamp,
    string? Actor,
    string? CorrelationId,
    [property: JsonPropertyName("signal_name")] string SignalName,
    [property: JsonPropertyName("old_weight")] double OldWeight,
    [property: JsonPropertyName("new_weight")] double NewWeight)
    : ProfileEvent(EventId, ProfileEventType.WeightChanged, ProfileId, ProfileVersion, Timestamp, Actor, CorrelationId);

/// <summary>
/// Event emitted when a scope is attached.
/// </summary>
public sealed record ScopeAttachedEvent(
    string EventId,
    string ProfileId,
    string ProfileVersion,
    DateTimeOffset Timestamp,
    string? Actor,
    string? CorrelationId,
    [property: JsonPropertyName("scope_type")] string ScopeType,
    [property: JsonPropertyName("scope_id")] string ScopeId,
    [property: JsonPropertyName("attachment_id")] string AttachmentId)
    : ProfileEvent(EventId, ProfileEventType.ScopeAttached, ProfileId, ProfileVersion, Timestamp, Actor, CorrelationId);

/// <summary>
/// Event subscription request.
/// </summary>
public sealed record EventSubscription(
    [property: JsonPropertyName("subscription_id")] string SubscriptionId,
    [property: JsonPropertyName("event_types")] IReadOnlyList<ProfileEventType> EventTypes,
    [property: JsonPropertyName("profile_filter")] string? ProfileFilter,
    [property: JsonPropertyName("webhook_url")] string? WebhookUrl,
    [property: JsonPropertyName("created_at")] DateTimeOffset CreatedAt,
    [property: JsonPropertyName("created_by")] string? CreatedBy);