using ZB.MOM.WW.ScadaBridge.Commons.Entities.ExternalSystems;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.InboundApi;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Instances;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Notifications;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Scripts;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Sites;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Templates;
using ZB.MOM.WW.ScadaBridge.Commons.Types.Enums;

namespace ZB.MOM.WW.ScadaBridge.Transport.Serialization;

/// <summary>
/// In-memory aggregate of all bundle-eligible Commons entities. Matches the
/// shape of <see cref="BundleContentDto"/> but uses the real persistence-
/// ignorant POCO types — what <see cref="EntitySerializer"/> consumes/produces
/// on the application side of the bundle boundary.
/// </summary>
// ApiKeys is intentionally absent: inbound API keys are not transported between
// environments (re-arch C4). The aggregate only carries API methods.
public sealed record EntityAggregate(
    IReadOnlyList<TemplateFolder> TemplateFolders,
    IReadOnlyList<Template> Templates,
    IReadOnlyList<SharedScript> SharedScripts,
    IReadOnlyList<ExternalSystemDefinition> ExternalSystems,
    IReadOnlyList<ExternalSystemMethod> ExternalSystemMethods,
    IReadOnlyList<DatabaseConnectionDefinition> DatabaseConnections,
    IReadOnlyList<NotificationList> NotificationLists,
    IReadOnlyList<SmtpConfiguration> SmtpConfigurations,
    IReadOnlyList<ApiMethod> ApiMethods)
{
    // M8: site/instance-scoped entities. Init-only with empty-array defaults so
    // existing positional `new EntityAggregate(...)` callers keep compiling and
    // never see a null collection; new callers opt in via object-initializer.
    public IReadOnlyList<Site> Sites { get; init; } = Array.Empty<Site>();
    public IReadOnlyList<DataConnection> DataConnections { get; init; } = Array.Empty<DataConnection>();
    public IReadOnlyList<Instance> Instances { get; init; } = Array.Empty<Instance>();
}

/// <summary>
/// Top-level serializable bundle payload. Lists are sequenced in dependency
/// order so importers can apply them inline. Lists are never null on the wire
/// — empty arrays are preferred over nulls so JSON consumers can rely on each
/// property being present — except <see cref="ApiKeys"/>, which is intentionally
/// null-defaulted (see below).
/// <para>
/// <see cref="ApiKeys"/> is a <b>legacy, read-only</b> field retained purely for
/// backward-compatible deserialization of bundles produced before the
/// inbound-API-key re-architecture (C4). New exports never populate it (it stays
/// <c>null</c> and is dropped from the JSON by the serializer's
/// <c>WhenWritingNull</c> policy); the importer counts any keys present in an old
/// bundle, ignores them, and surfaces a note — keys are re-created per environment.
/// </para>
/// </summary>
public sealed record BundleContentDto(
    IReadOnlyList<TemplateFolderDto> TemplateFolders,
    IReadOnlyList<TemplateDto> Templates,
    IReadOnlyList<SharedScriptDto> SharedScripts,
    IReadOnlyList<ExternalSystemDto> ExternalSystems,
    IReadOnlyList<DatabaseConnectionDto> DatabaseConnections,
    IReadOnlyList<NotificationListDto> NotificationLists,
    IReadOnlyList<SmtpConfigDto> SmtpConfigs,
    IReadOnlyList<ApiMethodDto> ApiMethods,
    IReadOnlyList<ApiKeyDto>? ApiKeys = null)
{
    // M8: site/instance-scoped payloads. Modeled as init-only properties with
    // empty-array defaults (rather than additional positional ctor params) for
    // two reasons:
    //   1. Forward-compat: deserializing an OLDER bundle whose content blob has
    //      no sites/dataConnections/instances fields leaves each property at its
    //      Array.Empty<>() initializer — so consumers always see an empty list,
    //      never null. (Contrast ApiKeys, which is a nullable legacy field.)
    //   2. Source-compat: every existing `new BundleContentDto(...)` positional
    //      caller keeps compiling unchanged; new producers opt in via an
    //      object-initializer (`new BundleContentDto(...) { Sites = ... }`).
    // These are written by the serializer (WhenWritingNull does not apply — they
    // are non-null), so new bundles always carry the three arrays explicitly.
    public IReadOnlyList<SiteDto> Sites { get; init; } = Array.Empty<SiteDto>();
    public IReadOnlyList<DataConnectionDto> DataConnections { get; init; } = Array.Empty<DataConnectionDto>();
    public IReadOnlyList<InstanceDto> Instances { get; init; } = Array.Empty<InstanceDto>();
}

/// <summary>
/// Carved-off secret values for an entity. The outer DTO carries all non-
/// sensitive fields; secrets land here so a future "share without secrets"
/// export mode can drop this block without touching anything else.
/// </summary>
public sealed record SecretsBlock(IReadOnlyDictionary<string, string> Values);

public sealed record TemplateFolderDto(
    string Name,
    string? ParentName,
    int SortOrder);

public sealed record TemplateDto(
    string Name,
    string? FolderName,
    string? BaseTemplateName,
    string? Description,
    IReadOnlyList<TemplateAttributeDto> Attributes,
    IReadOnlyList<TemplateAlarmDto> Alarms,
    IReadOnlyList<TemplateScriptDto> Scripts,
    IReadOnlyList<TemplateCompositionDto> Compositions);

public sealed record TemplateAttributeDto(
    string Name,
    string? Value,
    DataType DataType,
    bool IsLocked,
    string? Description,
    string? DataSourceReference,
    DataType? ElementDataType = null);

public sealed record TemplateAlarmDto(
    string Name,
    string? Description,
    int PriorityLevel,
    AlarmTriggerType TriggerType,
    string? TriggerConfiguration,
    bool IsLocked,
    string? OnTriggerScriptName);

public sealed record TemplateScriptDto(
    string Name,
    string Code,
    string? TriggerType,
    string? TriggerConfiguration,
    string? ParameterDefinitions,
    string? ReturnDefinition,
    bool IsLocked,
    TimeSpan? MinTimeBetweenRuns,
    // M2.5 (#9): per-script execution timeout (seconds). Additive trailing field;
    // null on bundles written before this field existed.
    int? ExecutionTimeoutSeconds = null);

public sealed record TemplateCompositionDto(
    string InstanceName,
    string ComposedTemplateName);

public sealed record SharedScriptDto(
    string Name,
    string Code,
    string? ParameterDefinitions,
    string? ReturnDefinition);

public sealed record ExternalSystemDto(
    string Name,
    string BaseUrl,
    string AuthType,
    int MaxRetries,
    TimeSpan RetryDelay,
    IReadOnlyList<ExternalSystemMethodDto> Methods,
    SecretsBlock? Secrets);

public sealed record ExternalSystemMethodDto(
    string Name,
    string HttpMethod,
    string Path,
    string? ParameterDefinitions,
    string? ReturnDefinition);

public sealed record DatabaseConnectionDto(
    string Name,
    int MaxRetries,
    TimeSpan RetryDelay,
    SecretsBlock? Secrets);

public sealed record NotificationListDto(
    string Name,
    NotificationType Type,
    IReadOnlyList<NotificationRecipientDto> Recipients);

public sealed record NotificationRecipientDto(
    string Name,
    string EmailAddress);

public sealed record SmtpConfigDto(
    string Host,
    int Port,
    string AuthType,
    string FromAddress,
    string? TlsMode,
    int ConnectionTimeoutSeconds,
    int MaxConcurrentConnections,
    int MaxRetries,
    TimeSpan RetryDelay,
    SecretsBlock? Secrets);

// Legacy DTO: only deserialized from pre-C4 bundles so the importer can count and
// ignore the keys they contain. New exports never emit an ApiKeys array.
public sealed record ApiKeyDto(
    string Name,
    string KeyHash,
    bool IsEnabled,
    SecretsBlock? Secrets);

// ApprovedApiKeyIds is intentionally absent: it linked methods to keys that are no
// longer transported (re-arch C4). Scopes are re-granted per environment. The field
// in any old bundle is simply ignored on read.
public sealed record ApiMethodDto(
    string Name,
    string Script,
    string? ParameterDefinitions,
    string? ReturnDefinition,
    int TimeoutSeconds);

// --- M8: site/instance-scoped transport DTOs --------------------------------
// These travel alongside the original central-config DTOs above. Sites and
// instances are referenced by their stable string identities (SiteIdentifier,
// UniqueName, TemplateName) rather than database ids so a bundle resolves
// correctly against the *target* environment's own surrogate keys.

/// <summary>
/// A site definition. Addresses are carried verbatim; the importer decides
/// whether to keep or rewrite them for the target environment.
/// </summary>
public sealed record SiteDto(
    string SiteIdentifier,
    string Name,
    string? Description,
    string? NodeAAddress,
    string? NodeBAddress,
    string? GrpcNodeAAddress,
    string? GrpcNodeBAddress);

/// <summary>
/// A site-scoped protocol connection (the <c>Sites.DataConnection</c> entity —
/// NOT the External-System <see cref="DatabaseConnectionDto"/>). The protocol-
/// specific Primary/Backup configuration JSON rides inside <see cref="Secrets"/>
/// so a "share without secrets" export can drop it as a unit.
/// </summary>
public sealed record DataConnectionDto(
    string SiteIdentifier,
    string Name,
    string Protocol,
    int FailoverRetryCount,
    SecretsBlock? Secrets);

public sealed record InstanceAttributeOverrideDto(
    string AttributeName,
    string? OverrideValue,
    DataType? ElementDataType);

public sealed record InstanceAlarmOverrideDto(
    string AlarmCanonicalName,
    string? TriggerConfigurationOverride,
    int? PriorityLevelOverride);

public sealed record InstanceNativeAlarmSourceOverrideDto(
    string SourceCanonicalName,
    string? ConnectionNameOverride,
    string? SourceReferenceOverride,
    string? ConditionFilterOverride);

public sealed record InstanceConnectionBindingDto(
    string AttributeName,
    string ConnectionName,
    string? DataSourceReferenceOverride);

/// <summary>
/// A deployable instance with all of its per-instance overrides and bindings.
/// References its template and site by name/identifier (not id).
/// </summary>
public sealed record InstanceDto(
    string UniqueName,
    string TemplateName,
    string SiteIdentifier,
    string? AreaName,
    InstanceState State,
    IReadOnlyList<InstanceAttributeOverrideDto> AttributeOverrides,
    IReadOnlyList<InstanceAlarmOverrideDto> AlarmOverrides,
    IReadOnlyList<InstanceNativeAlarmSourceOverrideDto> NativeAlarmSourceOverrides,
    IReadOnlyList<InstanceConnectionBindingDto> ConnectionBindings);