/*
 * Copyright (C) 2025 Mcp-Vala Project
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Author: Mcp-Vala Project
 */


/**
 * Tool-related data types for MCP protocol.
 * 
 * This namespace contains all tool-related types defined by the MCP specification,
 * including tool definitions, execution results, and related structures.
 */
namespace Mcp.Tools.Types {
    /**
     * Tool definition as defined by MCP protocol.
     */
    public class ToolDefinition : GLib.Object {
        /**
         * Name of the tool.
         */
        public string name { get; set; }
        
        /**
         * Optional title of the tool.
         */
        public string? title { get; set; }
        
        /**
         * Optional description of the tool.
         */
        public string? description { get; set; }
        
        /**
         * JSON schema for tool input.
         */
        public Variant input_schema { get; set; }
        
        /**
         * Optional JSON schema for tool output.
         */
        public Variant? output_schema { get; set; }
        
        /**
         * Optional execution settings.
         */
        public ToolExecution? execution { get; set; }
        
        /**
         * Optional annotations for the tool.
         */
        public ToolAnnotations? annotations { get; set; }
        
        /**
         * Creates a new ToolDefinition.
         * 
         * @param name Name of the tool
         * @param input_schema JSON schema for input
         */
        public ToolDefinition (string name, Variant input_schema) {
            this.name = name;
            this.input_schema = input_schema;
        }
        
        /**
         * Serializes ToolDefinition to GLib.Variant.
         *
         * @return A GLib.Variant representing this ToolDefinition
         */
        public Variant to_variant () {
            var builder = Mcp.Types.VariantUtils.new_dict_builder ();
            builder.add ("{sv}", "name", new Variant.string (name));
            
            Mcp.Types.VariantUtils.add_string_if_not_null (builder, "title", title);
            Mcp.Types.VariantUtils.add_string_if_not_null (builder, "description", description);
            
            builder.add ("{sv}", "inputSchema", input_schema);
            
            Mcp.Types.VariantUtils.add_variant_if_not_null (builder, "outputSchema", output_schema);
            Mcp.Types.VariantUtils.add_variant_if_not_null (builder, "execution",
                execution != null ? execution.to_variant () : null);
            Mcp.Types.VariantUtils.add_variant_if_not_null (builder, "annotations",
                annotations != null ? annotations.to_variant () : null);
            
            return builder.end ();
        }
        
        /**
         * Creates a ToolDefinition from GLib.Variant.
         *
         * @param variant The GLib.Variant to deserialize
         * @return The deserialized ToolDefinition
         * @throws Error If deserialization fails
         */
        public ToolDefinition.from_variant (Variant variant) throws Error {
            if (!variant.is_of_type (VariantType.VARDICT)) {
                throw new Mcp.Core.McpError.PARSE_ERROR ("ToolDefinition must be a dictionary");
            }
            
            if (variant.lookup_value ("name", null) == null) {
                throw new Mcp.Core.McpError.INVALID_REQUEST ("Missing name in ToolDefinition");
            }
            
            if (variant.lookup_value ("inputSchema", null) == null) {
                throw new Mcp.Core.McpError.INVALID_REQUEST ("Missing inputSchema in ToolDefinition");
            }
            
            this.name = variant.lookup_value ("name", VariantType.STRING).get_string ();
            
            if (variant.lookup_value ("title", null) != null) {
                this.title = variant.lookup_value ("title", VariantType.STRING).get_string ();
            }
            
            if (variant.lookup_value ("description", null) != null) {
                this.description = variant.lookup_value ("description", VariantType.STRING).get_string ();
            }
            
            this.input_schema = variant.lookup_value ("inputSchema", VariantType.VARDICT);
            
            if (variant.lookup_value ("outputSchema", null) != null) {
                this.output_schema = variant.lookup_value ("outputSchema", VariantType.VARDICT);
            }
            
            if (variant.lookup_value ("execution", null) != null) {
                this.execution = new ToolExecution.from_variant (variant.lookup_value ("execution", VariantType.VARDICT));
            }
            
            if (variant.lookup_value ("annotations", null) != null) {
                this.annotations = new ToolAnnotations.from_variant (variant.lookup_value ("annotations", VariantType.VARDICT));
            }
        }
    }
    
    /**
     * Tool execution settings with enhanced context and state management.
     */
    public class ToolExecution : GLib.Object {
        /**
         * Task support level.
         */
        public string task_support { get; set; default = "forbidden"; }
        
        /**
         * Whether the tool supports progress reporting.
         */
        public bool supports_progress { get; set; default = false; }
        
        /**
         * Whether the tool supports cancellation.
         */
        public bool supports_cancellation { get; set; default = false; }
        
        /**
         * Maximum execution time in seconds (0 for no limit).
         */
        public int timeout_seconds { get; set; default = 30; }
        
        /**
         * Creates a new ToolExecution.
         *
         * @param task_support Task support level
         * @param supports_progress Whether progress reporting is supported
         * @param supports_cancellation Whether cancellation is supported
         * @param timeout_seconds Maximum execution time in seconds
         */
        public ToolExecution (string task_support = "forbidden",
                            bool supports_progress = false,
                            bool supports_cancellation = false,
                            int timeout_seconds = 30) {
            this.task_support = task_support;
            this.supports_progress = supports_progress;
            this.supports_cancellation = supports_cancellation;
            this.timeout_seconds = timeout_seconds;
        }
        
        /**
         * Serializes ToolExecution to GLib.Variant.
         *
         * @return A GLib.Variant representing this ToolExecution
         */
        public Variant to_variant () {
            var builder = Mcp.Types.VariantUtils.new_dict_builder ();
            builder.add ("{sv}", "taskSupport", new Variant.string (task_support));
            
            if (supports_progress) {
                builder.add ("{sv}", "supportsProgress", new Variant.boolean (supports_progress));
            }
            
            if (supports_cancellation) {
                builder.add ("{sv}", "supportsCancellation", new Variant.boolean (supports_cancellation));
            }
            
            if (timeout_seconds > 0) {
                builder.add ("{sv}", "timeoutSeconds", new Variant.int32 (timeout_seconds));
            }
            
            return builder.end ();
        }
        
        /**
         * Creates a ToolExecution from GLib.Variant.
         *
         * @param variant The GLib.Variant to deserialize
         * @return The deserialized ToolExecution
         * @throws Error If deserialization fails
         */
        public ToolExecution.from_variant (Variant variant) throws Error {
            if (!variant.is_of_type (VariantType.VARDICT)) {
                throw new Mcp.Core.McpError.PARSE_ERROR ("ToolExecution must be a dictionary");
            }
            
            if (variant.lookup_value ("taskSupport", null) != null) {
                this.task_support = variant.lookup_value ("taskSupport", VariantType.STRING).get_string ();
            }
            
            if (variant.lookup_value ("supportsProgress", null) != null) {
                this.supports_progress = variant.lookup_value ("supportsProgress", VariantType.BOOLEAN).get_boolean ();
            }
            
            if (variant.lookup_value ("supportsCancellation", null) != null) {
                this.supports_cancellation = variant.lookup_value ("supportsCancellation", VariantType.BOOLEAN).get_boolean ();
            }
            
            if (variant.lookup_value ("timeoutSeconds", null) != null) {
                this.timeout_seconds = variant.lookup_value ("timeoutSeconds", VariantType.INT32).get_int32 ();
            }
        }
    }
    
    /**
     * Tool execution context for preserving state during execution.
     */
    public class ToolExecutionContext : GLib.Object {
        /**
         * Unique identifier for this execution context.
         */
        public string execution_id { get; set; }
        
        /**
         * The tool name being executed.
         */
        public string tool_name { get; set; }
        
        /**
         * The arguments passed to the tool.
         */
        public Variant arguments { get; set; }
        
        /**
         * Progress token for reporting progress.
         */
        public string? progress_token { get; set; }
        
        /**
         * Current execution state.
         */
        public ExecutionState state { get; set; default = ExecutionState.INITIALIZED; }
        
        /**
         * Timestamp when execution started.
         */
        public DateTime? start_time { get; set; }
        
        /**
         * Timestamp when execution ended.
         */
        public DateTime? end_time { get; set; }
        
        /**
         * Whether execution has been cancelled.
         */
        public bool is_cancelled { get; set; default = false; }
        
        /**
         * Cancellation source for async operations.
         */
        private GLib.Cancellable cancellable;
        
        /**
         * Creates a new ToolExecutionContext.
         *
         * @param execution_id Unique identifier for the execution
         * @param tool_name The tool name being executed
         * @param arguments The arguments passed to the tool
         * @param progress_token Optional progress token
         */
        public ToolExecutionContext (string execution_id, string tool_name,
                                    Variant arguments, string? progress_token = null) {
            this.execution_id = execution_id;
            this.tool_name = tool_name;
            this.arguments = arguments;
            this.progress_token = progress_token;
            this.cancellable = new GLib.Cancellable ();
        }
        
        /**
         * Gets the cancellable for this execution context.
         *
         * @return The cancellable object
         */
        public GLib.Cancellable get_cancellable () {
            return cancellable;
        }
        
        /**
         * Cancels the execution.
         */
        public void cancel () {
            is_cancelled = true;
            state = ExecutionState.CANCELLED;
            cancellable.cancel ();
        }
        
        /**
         * Marks the execution as started.
         */
        public void mark_started () {
            start_time = new DateTime.now_utc ();
            state = ExecutionState.RUNNING;
        }
        
        /**
         * Marks the execution as completed.
         */
        public void mark_completed () {
            end_time = new DateTime.now_utc ();
            if (state != ExecutionState.CANCELLED) {
                state = ExecutionState.COMPLETED;
            }
        }
        
        /**
         * Marks the execution as failed.
         */
        public void mark_failed () {
            end_time = new DateTime.now_utc ();
            state = ExecutionState.FAILED;
        }
        
        /**
         * Gets the execution duration in milliseconds.
         *
         * @return The duration in milliseconds, or 0 if not available
         */
        public int64 get_duration_ms () {
            if (start_time == null || end_time == null) {
                return 0;
            }
            
            return (int64) (end_time.difference (start_time) / 1000);
        }
    }
    
    /**
     * Execution states for tools.
     */
    public enum ExecutionState {
        /**
         * Execution has been initialized but not started.
         */
        INITIALIZED,
        
        /**
         * Execution is currently running.
         */
        RUNNING,
        
        /**
         * Execution completed successfully.
         */
        COMPLETED,
        
        /**
         * Execution failed.
         */
        FAILED,
        
        /**
         * Execution was cancelled.
         */
        CANCELLED
    }
    
    /**
     * Progress information for tool execution.
     */
    public class ToolProgress : GLib.Object {
        /**
         * Progress token identifying this progress update.
         */
        public string progress_token { get; set; }
        
        /**
         * Current progress value (0-100).
         */
        public double progress { get; set; }
        
        /**
         * Optional progress message.
         */
        public string? message { get; set; }
        
        /**
         * Creates a new ToolProgress.
         *
         * @param progress_token Progress token
         * @param progress Current progress value (0-100)
         * @param message Optional progress message
         */
        public ToolProgress (string progress_token, double progress, string? message = null) {
            this.progress_token = progress_token;
            this.progress = progress;
            this.message = message;
        }
        
        /**
         * Serializes ToolProgress to GLib.Variant.
         *
         * @return A GLib.Variant representing this ToolProgress
         */
        public Variant to_variant () {
            var builder = Mcp.Types.VariantUtils.new_dict_builder ();
            builder.add ("{sv}", "progressToken", new Variant.string (progress_token));
            builder.add ("{sv}", "progress", new Variant.double (progress));
            
            Mcp.Types.VariantUtils.add_string_if_not_null (builder, "message", message);
            
            return builder.end ();
        }
    }
    
    /**
     * Tool annotations.
     */
    public class ToolAnnotations : GLib.Object {
        /**
         * Optional audience for this tool.
         */
        public string? audience { get; set; }
        
        /**
         * Optional priority of this tool.
         */
        public double? priority { get; set; }
        
        /**
         * Creates a new ToolAnnotations.
         */
        public ToolAnnotations () {
        }
        
        /**
         * Serializes ToolAnnotations to GLib.Variant.
         *
         * @return A GLib.Variant representing this ToolAnnotations
         */
        public Variant to_variant () {
            var builder = Mcp.Types.VariantUtils.new_dict_builder ();
            
            Mcp.Types.VariantUtils.add_string_if_not_null (builder, "audience", audience);
            
            if (priority != null) {
                builder.add ("{sv}", "priority", new Variant.double (priority));
            }
            
            return builder.end ();
        }
        
        /**
         * Creates ToolAnnotations from GLib.Variant.
         *
         * @param variant The GLib.Variant to deserialize
         * @return The deserialized ToolAnnotations
         * @throws Error If deserialization fails
         */
        public ToolAnnotations.from_variant (Variant variant) throws Error {
            if (!variant.is_of_type (VariantType.VARDICT)) {
                throw new Mcp.Core.McpError.PARSE_ERROR ("ToolAnnotations must be a dictionary");
            }
            
            if (variant.lookup_value ("audience", null) != null) {
                this.audience = variant.lookup_value ("audience", VariantType.STRING).get_string ();
            }
            
            if (variant.lookup_value ("priority", null) != null) {
                this.priority = variant.lookup_value ("priority", VariantType.DOUBLE).get_double ();
            }
        }
    }
    
    /**
     * Result of calling a tool.
     */
    public class CallToolResult : GLib.Object {
        /**
         * List of content blocks in the result.
         */
        public Gee.ArrayList<Mcp.Types.Common.ContentBlock> content { get; set; }
        
        /**
         * Optional structured content data.
         * This field is used for structured data that doesn't fit into content blocks,
         * such as JSON objects, arrays, or other structured data formats.
         */
        public Variant? structured_content { get; set; }
        
        /**
         * Whether this result represents an error.
         */
        public bool is_error { get; set; default = false; }
        
        /**
         * Optional metadata about the result.
         */
        public Variant? metadata { get; set; }
        
        /**
         * Optional pagination cursor for results that support pagination.
         */
        public string? next_cursor { get; set; }
        
        /**
         * Creates a new CallToolResult.
         */
        public CallToolResult () {
            content = new Gee.ArrayList<Mcp.Types.Common.ContentBlock> ();
        }
        
        /**
         * Creates a new CallToolResult with content.
         *
         * @param content_blocks Initial content blocks
         * @param is_error Whether this result represents an error
         */
        public CallToolResult.with_content (Gee.ArrayList<Mcp.Types.Common.ContentBlock> content_blocks, bool is_error = false) {
            this.content = content_blocks;
            this.is_error = is_error;
        }
        
        /**
         * Creates a new CallToolResult with structured content.
         *
         * @param structured_data The structured content data
         * @param text_description Optional text description
         * @param is_error Whether this result represents an error
         */
        public CallToolResult.with_structured (Variant structured_data, string? text_description = null, bool is_error = false) {
            this.content = new Gee.ArrayList<Mcp.Types.Common.ContentBlock> ();
            this.structured_content = structured_data;
            this.is_error = is_error;
            
            if (text_description != null) {
                var text_content = new Mcp.Types.Common.TextContent (text_description);
                this.content.add (text_content);
            }
        }
        
        /**
         * Serializes CallToolResult to GLib.Variant.
         *
         * @return A GLib.Variant representing this CallToolResult
         */
        public Variant to_variant () {
            var builder = Mcp.Types.VariantUtils.new_dict_builder ();
            
            // Serialize content array
            var content_builder = Mcp.Types.VariantUtils.new_dict_array_builder ();
            foreach (var content_block in content) {
                content_builder.add_value (content_block.to_variant ());
            }
            builder.add ("{sv}", "content", content_builder.end ());
            
            // Add structured content if present
            Mcp.Types.VariantUtils.add_variant_if_not_null (builder, "structuredContent", structured_content);
            
            // Add error flag
            builder.add ("{sv}", "isError", new Variant.boolean (is_error));
            
            // Add metadata if present
            Mcp.Types.VariantUtils.add_variant_if_not_null (builder, "metadata", metadata);
            
            // Add pagination cursor if present
            Mcp.Types.VariantUtils.add_string_if_not_null (builder, "nextCursor", next_cursor);
            
            return builder.end ();
        }
        
        /**
         * Creates a CallToolResult from GLib.Variant.
         *
         * @param variant The GLib.Variant to deserialize
         * @return The deserialized CallToolResult
         * @throws Error If deserialization fails
         */
        public CallToolResult.from_variant (Variant variant) throws Error {
            if (!variant.is_of_type (VariantType.VARDICT)) {
                throw new Mcp.Core.McpError.PARSE_ERROR ("CallToolResult must be a dictionary");
            }
            
            if (variant.lookup_value ("content", null) == null) {
                throw new Mcp.Core.McpError.INVALID_REQUEST ("Missing content in CallToolResult");
            }
            
            this.content = new Gee.ArrayList<Mcp.Types.Common.ContentBlock> ();
            
            var content = variant.lookup_value ("content", new VariantType ("aa{sv}"));
            
            for (size_t i = 0; i < content.n_children (); i++) {
                var element = content.get_child_value (i);
                if (element.is_of_type (VariantType.VARDICT)) {
                    var content_block = deserialize_content_block (element);
                    if (content_block != null) {
                        this.content.add (content_block);
                    }
                }
            }
            
            // Parse structured content if present
            if (variant.lookup_value ("structuredContent", null) != null) {
                this.structured_content = variant.lookup_value ("structuredContent", null);
            }
            
            // Parse error flag if present
            if (variant.lookup_value ("isError", null) != null) {
                this.is_error = variant.lookup_value ("isError", VariantType.BOOLEAN).get_boolean ();
            }
            
            // Parse metadata if present
            if (variant.lookup_value ("metadata", null) != null) {
                this.metadata = variant.lookup_value ("metadata", null);
            }
            
            // Parse pagination cursor if present
            if (variant.lookup_value ("nextCursor", null) != null) {
                this.next_cursor = variant.lookup_value ("nextCursor", VariantType.STRING).get_string ();
            }
        }
        
        /**
         * Deserializes a content block from a Variant.
         *
         * @param variant The Variant to deserialize
         * @return The deserialized ContentBlock or null if type is unknown
         * @throws Error If deserialization fails
         */
        private Mcp.Types.Common.ContentBlock? deserialize_content_block (Variant variant) throws Error {
            if (!variant.is_of_type (VariantType.VARDICT)) {
                return null;
            }
            
            if (variant.lookup_value ("type", null) == null) {
                throw new Mcp.Core.McpError.INVALID_REQUEST ("Content block missing type field");
            }
            
            string type = variant.lookup_value ("type", VariantType.STRING).get_string ();
            
            switch (type) {
                case "text":
                    return new Mcp.Types.Common.TextContent.from_variant (variant);
                case "image":
                    return new Mcp.Types.Common.ImageContent.from_variant (variant);
                case "audio":
                    return new Mcp.Types.Common.AudioContent.from_variant (variant);
                case "resource_link":
                    return new Mcp.Types.Common.ResourceLink.from_variant (variant);
                case "resource":
                    return new Mcp.Types.Common.EmbeddedResource.from_variant (variant);
                default:
                    // Unknown content type, create a generic text content with warning
                    return new Mcp.Types.Common.TextContent (
                        "Warning: Unknown content type '%s'".printf (type)
                    );
            }
        }
        
        /**
         * Adds a text content block to result.
         *
         * @param text The text content to add
         */
        public void add_text (string text) {
            var text_content = new Mcp.Types.Common.TextContent (text);
            content.add (text_content);
        }
        
        /**
         * Adds an image content block to result.
         *
         * @param data Base64 encoded image data
         * @param mime_type MIME type of image
         */
        public void add_image (string data, string mime_type) {
            var image_content = new Mcp.Types.Common.ImageContent (data, mime_type);
            content.add (image_content);
        }
        
        /**
         * Adds a resource link to result.
         *
         * @param uri URI of resource
         * @param name Name of resource
         */
        public void add_resource_link (string uri, string name) {
            var resource_link = new Mcp.Types.Common.ResourceLink (uri, name);
            content.add (resource_link);
        }
        
        /**
         * Sets structured content and optionally adds a text description.
         *
         * @param structured_data The structured content data
         * @param description Optional text description
         */
        public void update_structured_content (Variant structured_data, string? description = null) {
            this.structured_content = structured_data;
            
            if (description != null) {
                add_text (description);
            }
        }
        
        /**
         * Sets metadata for result.
         *
         * @param metadata The metadata to set
         */
        public void update_metadata (Variant metadata) {
            this.metadata = metadata;
        }
        
        /**
         * Sets pagination cursor for result.
         *
         * @param cursor The pagination cursor
         */
        public void update_next_cursor (string cursor) {
            this.next_cursor = cursor;
        }
        
        /**
         * Creates a successful result with text content.
         *
         * @param text The text content
         * @return A successful CallToolResult
         */
        public static CallToolResult success (string text) {
            var result = new CallToolResult ();
            result.add_text (text);
            return result;
        }
        
        /**
         * Creates an error result with text content.
         *
         * @param error_message The error message
         * @return An error CallToolResult
         */
        public static CallToolResult error (string error_message) {
            var result = new CallToolResult ();
            result.add_text (error_message);
            result.is_error = true;
            return result;
        }
        
        /**
         * Creates a successful result with structured content.
         *
         * @param structured_data The structured content data
         * @param description Optional text description
         * @return A successful CallToolResult with structured content
         */
        public static CallToolResult success_structured (Variant structured_data, string? description = null) {
            var result = new CallToolResult ();
            result.update_structured_content (structured_data, description);
            return result;
        }
    }
}