/* ========================================================================
 * Copyright (c) 2005-2025 The OPC Foundation, Inc. All rights reserved.
 *
 * OPC Foundation MIT License 1.00
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * The complete license agreement can be found here:
 * http://opcfoundation.org/License/MIT/1.00/
 * ======================================================================*/

namespace Opc.Ua.SourceGeneration
{
    /// <summary>
    /// Templates emitted by the <see cref="NodeManagerGenerator"/>.
    /// </summary>
    /// <remarks>
    /// All emitted code uses fully-qualified type names so the consuming
    /// project only needs to reference <c>Opc.Ua.Server</c> (which itself
    /// transitively brings in <c>Opc.Ua.Core</c>).
    /// </remarks>
    internal static class NodeManagerTemplates
    {
        /// <summary>
        /// Top-level template for the partial <c>NodeManager</c> class.
        /// </summary>
        public static readonly TemplateString File = TemplateString.Parse(
            $$"""
            {{Tokens.CodeHeader}}

            // The namespace-taking constructor is emitted for every manager,
            // but the user's partial decides whether the class is sealed and
            // the generator cannot see that. In a sealed manager the protected
            // constructor is merely unreachable, not wrong.
            #pragma warning disable CS0628 // New protected member in sealed type

            namespace {{Tokens.NamespacePrefix}}
            {
                /// <summary>
                /// Source-generated node manager for the
                /// <c>{{Tokens.NamespaceUri}}</c> namespace.
                /// </summary>
                /// <remarks>
                /// Implement <c>partial void Configure(INodeManagerBuilder builder)</c>
                /// in a sibling partial to wire per-node callbacks using the
                /// fluent API in <c>Opc.Ua.Server.Fluent</c>. Wiring that has to
                /// await — materialising instances, reading a store — goes into
                /// an override of
                /// <c>ConfigureAsync(INodeManagerBuilder, CancellationToken)</c>,
                /// which runs first so <c>Configure</c> sees the nodes it created.
                /// </remarks>
                [global::System.CodeDom.Compiler.GeneratedCodeAttribute("{{Tokens.Tool}}", "{{Tokens.Version}}")]
                public partial class {{Tokens.NodeManagerClassName}} :
                    global::Opc.Ua.Server.Fluent.FluentNodeManagerBase,
                    global::Opc.Ua.Server.Nodes.INodeSetImportFactoryProvider
                {
                    private global::Opc.Ua.Server.Fluent.NodeManagerBuilder? __m_builder;

                    /// <summary>
                    /// The namespace URIs this manager owns, in the order they
                    /// are reported to the master node manager. The first entry
                    /// becomes <c>NamespaceIndexes[0]</c> and therefore the
                    /// manager's own <c>NamespaceIndex</c>: the namespace an
                    /// unqualified browse path resolves in. Where runtime
                    /// NodeIds are minted is the NodeId factory's to decide,
                    /// not this order's. Pass a different array to the
                    /// protected constructor to change the set or the order.
                    /// </summary>
                    public static string[] DefaultNamespaceUris()
                    {
                        return new string[] { {{Tokens.NamespaceUri}}{{Tokens.AdditionalNamespaceUris}} };
                    }

                    {{Tokens.NodeManagerDefaultConstructor}}

                    /// <summary>
                    /// Initializes a new <see cref="{{Tokens.NodeManagerClassName}}"/>
                    /// that owns <paramref name="namespaceUris"/>. Chain to this
                    /// from a constructor of your own to take collaborators the
                    /// generated signature does not carry, to change which
                    /// namespaces the manager owns, or to change their order.
                    /// </summary>
                    /// <param name="server">The hosting server.</param>
                    /// <param name="configuration">The application configuration.</param>
                    /// <param name="namespaceUris">
                    /// The namespace URIs to report, in order. <c>null</c> adopts
                    /// <see cref="DefaultNamespaceUris"/>.
                    /// </param>
                    protected {{Tokens.NodeManagerClassName}}(
                        global::Opc.Ua.Server.IServerInternal server,
                        global::Opc.Ua.ApplicationConfiguration configuration,
                        string[]? namespaceUris)
                        : base(
                            server,
                            configuration,
                            global::Opc.Ua.TelemetryExtensions.CreateLogger<{{Tokens.NodeManagerClassName}}>(
                                server.Telemetry),
                            namespaceUris ?? DefaultNamespaceUris())
                    {
                    }

                    /// <summary>
                    /// User extensibility hook. Implement in a sibling
                    /// <c>partial</c> to wire callbacks via the fluent builder.
                    /// Override
                    /// <c>FluentNodeManagerBase.ConfigureAsync</c> instead when
                    /// the wiring has to await.
                    /// </summary>
                    partial void Configure(global::Opc.Ua.Server.Fluent.INodeManagerBuilder builder);

                    /// <summary>
                    /// Source-generated typed counterpart of
                    /// <see cref="Configure(global::Opc.Ua.Server.Fluent.INodeManagerBuilder)"/>.
                    /// Implement in a sibling <c>partial</c> to wire callbacks via the
                    /// strongly-typed model-traversal surface generated for this manager.
                    /// </summary>
                    partial void Configure(I{{Tokens.NodeManagerClassName}}Builder builder);

                    /// <summary>
                    /// Supplies the concrete states used when a NodeSet2
                    /// document imported through
                    /// <c>INodeManagerBuilder.Import</c> declares a node of
                    /// this model.
                    /// </summary>
                    public global::Opc.Ua.ArrayOf<
                        global::Opc.Ua.Server.Nodes.INodeSetImportFactory>
                        GetNodeSetImportFactories()
                    {
                        var __factories = new global::System.Collections.Generic.List<
                            global::Opc.Ua.Server.Nodes.INodeSetImportFactory>();
                        global::Opc.Ua.ArrayOf<
                            global::Opc.Ua.Server.Nodes.INodeSetImportFactory>
                            __generatedFactories =
                                global::{{Tokens.Prefix}}.
                                    {{Tokens.NodeSetImportFactoryProviderClassName}}.Instance.
                                    GetNodeSetImportFactories();
                        for (int __index = 0;
                            __index < __generatedFactories.Count;
                            __index++)
                        {
                            __factories.Add(__generatedFactories[__index]);
                        }
                        AddNodeSetImportFactories(__factories);
                        return new global::Opc.Ua.ArrayOf<
                            global::Opc.Ua.Server.Nodes.INodeSetImportFactory>(
                                __factories.ToArray());
                    }

                    /// <summary>
                    /// Adds import factories supplied by dependency models or
                    /// by the application. Implement in a sibling
                    /// <c>partial</c>.
                    /// </summary>
                    partial void AddNodeSetImportFactories(
                        global::System.Collections.Generic.List<
                            global::Opc.Ua.Server.Nodes.INodeSetImportFactory> factories);

                    /// <inheritdoc/>
                    protected override global::System.Threading.Tasks.ValueTask<global::Opc.Ua.NodeStateCollection> LoadPredefinedNodesAsync(
                        global::Opc.Ua.ISystemContext context,
                        global::System.Threading.CancellationToken cancellationToken = default)
                    {
                        return new global::System.Threading.Tasks.ValueTask<global::Opc.Ua.NodeStateCollection>(
                            global::{{Tokens.Prefix}}.{{Tokens.Namespace}}Extensions.Add{{Tokens.Namespace}}(
                                new global::Opc.Ua.NodeStateCollection(),
                                context));
                    }

                    /// <inheritdoc/>
                    public override async global::System.Threading.Tasks.ValueTask CreateAddressSpaceAsync(
                        global::System.Collections.Generic.IDictionary<global::Opc.Ua.NodeId,
                            global::System.Collections.Generic.IList<global::Opc.Ua.IReference>> externalReferences,
                        global::System.Threading.CancellationToken cancellationToken = default)
                    {
                        await LoadPredefinedNodesAsync(SystemContext, externalReferences, cancellationToken).ConfigureAwait(false);

                        ushort __nsIndex = Server.NamespaceUris.GetIndexOrAppend({{Tokens.NamespaceUri}});

                        __m_builder = new global::Opc.Ua.Server.Fluent.NodeManagerBuilder(
                            SystemContext,
                            this,
                            __nsIndex,
                            __FindRootByBrowseName,
                            __FindRootByNodeId,
                            __FindByTypeDefinitionId,
                            __FindByDataTypeId);

                        // Attach the FluentNodeManagerBase event-source registry
                        // to the builder so Publish(...) extensions can resolve
                        // it before the user's Configure partial(s) run.
                        AttachToBuilder(__m_builder);

                        // The awaitable wiring seam. Runs before the synchronous
                        // Configure partial(s) so instances it materialises are in
                        // the address space by the time they wire callbacks.
                        await ConfigureAsync(__m_builder, cancellationToken).ConfigureAwait(false);

                        Configure(__m_builder);
                        Configure(new {{Tokens.NodeManagerClassName}}TypedBuilder(__m_builder));

                        // Register nodes created by the Configure partial(s)
                        // through the builder's Add* methods before the
                        // reverse-reference pass runs, so their references to
                        // externally owned nodes are mirrored too.
                        await RegisterAuthoredNodesAsync(__m_builder, cancellationToken).ConfigureAwait(false);

                        // Mirror references from configure-created nodes to
                        // nodes owned by other node managers (e.g. the Objects
                        // folder) into the externalReferences dictionary.
                        await CompleteConfigureAsync(externalReferences, cancellationToken).ConfigureAwait(false);

                        // Seals the builder, replays NotifyNodeAdded for every
                        // predefined node so per-node lifecycle hooks fire
                        // deterministically, and only then completes the
                        // registrations Configure could not await (root
                        // notifiers) and starts the simulations, so no
                        // simulated value change can precede the OnNodeAdded
                        // handler of its own node.
                        await SealConfigurationAsync(__m_builder, cancellationToken).ConfigureAwait(false);
                    }

                    /// <inheritdoc/>
                    protected override async global::System.Threading.Tasks.ValueTask AddPredefinedNodeAsync(
                        global::Opc.Ua.ISystemContext context,
                        global::Opc.Ua.NodeState node,
                        global::System.Threading.CancellationToken cancellationToken = default)
                    {
                        await base.AddPredefinedNodeAsync(context, node, cancellationToken).ConfigureAwait(false);
                        if (__m_builder is { } __b)
                        {
                            __b.Dispatcher.NotifyNodeAdded(context, node);
                        }
                    }

                    /// <inheritdoc/>
                    protected override async global::System.Threading.Tasks.ValueTask RemovePredefinedNodeAsync(
                        global::Opc.Ua.ISystemContext context,
                        global::Opc.Ua.NodeState node,
                        global::System.Collections.Generic.List<global::Opc.Ua.Server.LocalReference> referencesToRemove,
                        global::System.Threading.CancellationToken cancellationToken = default)
                    {
                        if (__m_builder is { } __b)
                        {
                            __b.Dispatcher.NotifyNodeRemoved(context, node);
                        }
                        await base.RemovePredefinedNodeAsync(context, node, referencesToRemove, cancellationToken).ConfigureAwait(false);
                    }

                    private global::Opc.Ua.NodeState __FindRootByBrowseName(global::Opc.Ua.QualifiedName browseName)
                    {
                        if (browseName == null)
                        {
                            return null;
                        }
                        foreach (global::Opc.Ua.NodeState __node in PredefinedNodes.Values)
                        {
                            if (__node.BrowseName == browseName)
                            {
                                return __node;
                            }
                        }
                        return null;
                    }

                    private global::Opc.Ua.NodeState __FindRootByNodeId(global::Opc.Ua.NodeId nodeId)
                    {
                        if (nodeId.IsNull)
                        {
                            return null;
                        }
                        return PredefinedNodes.TryGetValue(nodeId, out global::Opc.Ua.NodeState __node) ? __node : null;
                    }

                    private global::System.Collections.Generic.IReadOnlyList<global::Opc.Ua.NodeState> __FindByTypeDefinitionId(
                        global::Opc.Ua.NodeId typeDefinitionId)
                    {
                        if (typeDefinitionId == null || typeDefinitionId.IsNull)
                        {
                            return global::System.Array.Empty<global::Opc.Ua.NodeState>();
                        }

                        var __matches = new global::System.Collections.Generic.List<global::Opc.Ua.NodeState>();
                        var __queue = new global::System.Collections.Generic.Queue<global::Opc.Ua.NodeState>();
                        var __seen = new global::System.Collections.Generic.HashSet<global::Opc.Ua.NodeState>();
                        var __scratch = new global::System.Collections.Generic.List<global::Opc.Ua.BaseInstanceState>();
                        foreach (global::Opc.Ua.NodeState __root in PredefinedNodes.Values)
                        {
                            if (__root != null && __seen.Add(__root))
                            {
                                __queue.Enqueue(__root);
                            }
                        }
                        while (__queue.Count > 0)
                        {
                            global::Opc.Ua.NodeState __current = __queue.Dequeue();
                            if (__current is global::Opc.Ua.BaseInstanceState __instance &&
                                __instance.TypeDefinitionId == typeDefinitionId)
                            {
                                __matches.Add(__current);
                            }
                            __scratch.Clear();
                            __current.GetChildren(SystemContext, __scratch);
                            for (int __i = 0; __i < __scratch.Count; __i++)
                            {
                                global::Opc.Ua.BaseInstanceState __child = __scratch[__i];
                                if (__child != null && __seen.Add(__child))
                                {
                                    __queue.Enqueue(__child);
                                }
                            }
                        }
                        return __matches;
                    }

                    private global::Opc.Ua.ArrayOf<global::Opc.Ua.NodeState> __FindByDataTypeId(
                        global::Opc.Ua.NodeId dataTypeId)
                    {
                        if (dataTypeId == null || dataTypeId.IsNull)
                        {
                            return [];
                        }

                        var __matches = new global::System.Collections.Generic.List<global::Opc.Ua.NodeState>();
                        var __queue = new global::System.Collections.Generic.Queue<global::Opc.Ua.NodeState>();
                        var __seen = new global::System.Collections.Generic.HashSet<global::Opc.Ua.NodeState>();
                        var __scratch = new global::System.Collections.Generic.List<global::Opc.Ua.BaseInstanceState>();
                        foreach (global::Opc.Ua.NodeState __root in PredefinedNodes.Values)
                        {
                            if (__root != null && __seen.Add(__root))
                            {
                                __queue.Enqueue(__root);
                            }
                        }
                        while (__queue.Count > 0)
                        {
                            global::Opc.Ua.NodeState __current = __queue.Dequeue();
                            if (__current is global::Opc.Ua.BaseVariableState __variable &&
                                __variable.DataType == dataTypeId)
                            {
                                __matches.Add(__current);
                            }
                            __scratch.Clear();
                            __current.GetChildren(SystemContext, __scratch);
                            for (int __i = 0; __i < __scratch.Count; __i++)
                            {
                                global::Opc.Ua.BaseInstanceState __child = __scratch[__i];
                                if (__child != null && __seen.Add(__child))
                                {
                                    __queue.Enqueue(__child);
                                }
                            }
                        }
                        return new global::Opc.Ua.ArrayOf<global::Opc.Ua.NodeState>(
                            __matches.ToArray());
                    }
                }
            }
            """);

        /// <summary>
        /// The public <c>(server, configuration)</c> constructor. Emitted
        /// unless the binding sets <c>GenerateDefaultConstructor=false</c>,
        /// which managers do when they cannot be built from those two
        /// arguments alone.
        /// </summary>
        public static readonly TemplateString DefaultConstructor = TemplateString.Parse(
            $$"""
            /// <summary>
            /// Initializes a new <see cref="{{Tokens.NodeManagerClassName}}"/>
            /// owning <see cref="DefaultNamespaceUris"/>.
            /// </summary>
            /// <param name="server">The hosting server.</param>
            /// <param name="configuration">The application configuration.</param>
            public {{Tokens.NodeManagerClassName}}(
                global::Opc.Ua.Server.IServerInternal server,
                global::Opc.Ua.ApplicationConfiguration configuration)
                : this(server, configuration, null)
            {
            }
            """);

        /// <summary>
        /// Top-level template for the generated factory class.
        /// </summary>
        public static readonly TemplateString FactoryFile = TemplateString.Parse(
            $$"""
            {{Tokens.CodeHeader}}

            namespace {{Tokens.NamespacePrefix}}
            {
                /// <summary>
                /// Source-generated <see cref="global::Opc.Ua.Server.INodeManagerFactory"/>
                /// for the <c>{{Tokens.NamespaceUri}}</c> namespace.
                /// </summary>
                [global::System.CodeDom.Compiler.GeneratedCodeAttribute("{{Tokens.Tool}}", "{{Tokens.Version}}")]
                public partial class {{Tokens.NodeManagerFactoryClassName}} : global::Opc.Ua.Server.IAsyncNodeManagerFactory
                {
                    /// <inheritdoc/>
                    public virtual global::Opc.Ua.ArrayOf<string> NamespacesUris
                        => new global::Opc.Ua.ArrayOf<string>(new string[] { {{Tokens.NamespaceUri}}{{Tokens.AdditionalNamespaceUris}} });

                    /// <inheritdoc/>
                    public virtual global::System.Threading.Tasks.ValueTask<global::Opc.Ua.Server.IAsyncNodeManager> CreateAsync(
                        global::Opc.Ua.Server.IServerInternal server,
                        global::Opc.Ua.ApplicationConfiguration configuration,
                        global::System.Threading.CancellationToken cancellationToken = default)
                    {
                        return new global::System.Threading.Tasks.ValueTask<global::Opc.Ua.Server.IAsyncNodeManager>(
                            new {{Tokens.NodeManagerClassName}}(server, configuration));
                    }
                }
            }
            """);
    }
}