/*
 * 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
 */


/**
 * Prompt-related data types for MCP protocol.
 * 
 * This namespace contains all prompt-related types defined by the MCP specification,
 * including prompt definitions, arguments, and related structures.
 */
namespace Mcp.Prompts.Types {
    /**
     * Prompt definition as defined by MCP protocol.
     */
    public class PromptDefinition : GLib.Object {
        /**
         * Name of the prompt.
         */
        public string name { get; set; }
        
        /**
         * Optional title of the prompt.
         */
        public string? title { get; set; }
        
        /**
         * Optional description of the prompt.
         */
        public string? description { get; set; }
        
        /**
         * List of prompt arguments.
         */
        public Gee.ArrayList<PromptArgument> arguments { get; set; }
        
        /**
         * Creates a new PromptDefinition.
         * 
         * @param name Name of the prompt
         */
        public PromptDefinition (string name) {
            this.name = name;
            this.arguments = new Gee.ArrayList<PromptArgument> ();
        }
        
        /**
         * Serializes PromptDefinition to GLib.Variant.
         *
         * @return A GLib.Variant representing this PromptDefinition
         */
        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);
            
            // Serialize arguments array
            var args_builder = Mcp.Types.VariantUtils.new_dict_array_builder ();
            foreach (var arg in arguments) {
                args_builder.add_value (arg.to_variant ());
            }
            builder.add ("{sv}", "arguments", args_builder.end ());
            
            return builder.end ();
        }
        
        /**
         * Creates a PromptDefinition from GLib.Variant.
         *
         * @param variant The GLib.Variant to deserialize
         * @return The deserialized PromptDefinition
         * @throws Error If deserialization fails
         */
        public PromptDefinition.from_variant (Variant variant) throws Error {
            if (!variant.is_of_type (VariantType.VARDICT)) {
                throw new Mcp.Core.McpError.PARSE_ERROR ("PromptDefinition must be a dictionary");
            }
            
            if (variant.lookup_value ("name", null) == null) {
                throw new Mcp.Core.McpError.INVALID_REQUEST ("Missing name in PromptDefinition");
            }
            
            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.arguments = new Gee.ArrayList<PromptArgument> ();
            
            if (variant.lookup_value ("arguments", null) != null) {
                var args = variant.lookup_value ("arguments", new VariantType ("aa{sv}"));
                
                for (size_t i = 0; i < args.n_children (); i++) {
                    var arg = new PromptArgument.from_variant (args.get_child_value (i));
                    arguments.add (arg);
                }
            }
        }
    }
    
    /**
     * Prompt argument definition.
     */
    public class PromptArgument : GLib.Object {
        /**
         * Name of the argument.
         */
        public string name { get; set; }
        
        /**
         * Optional title of the argument.
         */
        public string? title { get; set; }
        
        /**
         * Optional description of the argument.
         */
        public string? description { get; set; }
        
        /**
         * Whether the argument is required.
         */
        public bool required { get; set; default = false; }
        
        /**
         * Creates a new PromptArgument.
         * 
         * @param name Name of the argument
         */
        public PromptArgument (string name) {
            this.name = name;
        }
        
        /**
         * Serializes PromptArgument to GLib.Variant.
         *
         * @return A GLib.Variant representing this PromptArgument
         */
        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}", "required", new Variant.boolean (required));
            
            return builder.end ();
        }
        
        /**
         * Creates a PromptArgument from GLib.Variant.
         *
         * @param variant The GLib.Variant to deserialize
         * @return The deserialized PromptArgument
         * @throws Error If deserialization fails
         */
        public PromptArgument.from_variant (Variant variant) throws Error {
            if (!variant.is_of_type (VariantType.VARDICT)) {
                throw new Mcp.Core.McpError.PARSE_ERROR ("PromptArgument must be a dictionary");
            }
            
            if (variant.lookup_value ("name", null) == null) {
                throw new Mcp.Core.McpError.INVALID_REQUEST ("Missing name in PromptArgument");
            }
            
            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 ();
            }
            
            if (variant.lookup_value ("required", null) != null) {
                this.required = variant.lookup_value ("required", VariantType.BOOLEAN).get_boolean ();
            }
        }
    }
    
    /**
     * Result of getting a prompt.
     */
    public class GetPromptResult : GLib.Object {
        /**
         * Optional description of the prompt result.
         */
        public string? description { get; set; }
        
        /**
         * List of prompt messages.
         */
        public Gee.ArrayList<PromptMessage> messages { get; set; }
        
        /**
         * Creates a new GetPromptResult.
         */
        public GetPromptResult () {
            messages = new Gee.ArrayList<PromptMessage> ();
        }
        
        /**
         * Serializes GetPromptResult to GLib.Variant.
         *
         * @return A GLib.Variant representing this GetPromptResult
         */
        public Variant to_variant () {
            var builder = Mcp.Types.VariantUtils.new_dict_builder ();
            
            Mcp.Types.VariantUtils.add_string_if_not_null (builder, "description", description);
            
            // Serialize messages array
            var messages_builder = Mcp.Types.VariantUtils.new_dict_array_builder ();
            foreach (var message in messages) {
                messages_builder.add_value (message.to_variant ());
            }
            builder.add ("{sv}", "messages", messages_builder.end ());
            
            return builder.end ();
        }
        
        /**
         * Creates a GetPromptResult from GLib.Variant.
         *
         * @param variant The GLib.Variant to deserialize
         * @return The deserialized GetPromptResult
         * @throws Error If deserialization fails
         */
        public GetPromptResult.from_variant (Variant variant) throws Error {
            if (!variant.is_of_type (VariantType.VARDICT)) {
                throw new Mcp.Core.McpError.PARSE_ERROR ("GetPromptResult must be a dictionary");
            }
            
            if (variant.lookup_value ("description", null) != null) {
                this.description = variant.lookup_value ("description", VariantType.STRING).get_string ();
            }
            
            this.messages = new Gee.ArrayList<PromptMessage> ();
            
            if (variant.lookup_value ("messages", null) != null) {
                var messages = variant.lookup_value ("messages", new VariantType ("aa{sv}"));
                
                for (size_t i = 0; i < messages.n_children (); i++) {
                    var message = new PromptMessage.from_variant (messages.get_child_value (i));
                    this.messages.add (message);
                }
            }
        }
    }
    
    /**
     * Prompt message.
     */
    public class PromptMessage : GLib.Object {
        /**
         * Role of the message sender ("user" or "assistant").
         */
        public string role { get; set; }
        
        /**
         * Content of the message.
         */
        public Mcp.Types.Common.ContentBlock content { get; set; }
        
        /**
         * Creates a new PromptMessage.
         * 
         * @param role Role of the message
         * @param content Content of the message
         */
        public PromptMessage (string role, Mcp.Types.Common.ContentBlock content) {
            this.role = role;
            this.content = content;
        }
        
        /**
         * Serializes PromptMessage to GLib.Variant.
         *
         * @return A GLib.Variant representing this PromptMessage
         */
        public Variant to_variant () {
            var builder = Mcp.Types.VariantUtils.new_dict_builder ();
            builder.add ("{sv}", "role", new Variant.string (role));
            builder.add ("{sv}", "content", content.to_variant ());
            
            return builder.end ();
        }
        
        /**
         * Creates a PromptMessage from GLib.Variant.
         *
         * @param variant The GLib.Variant to deserialize
         * @return The deserialized PromptMessage
         * @throws Error If deserialization fails
         */
        public PromptMessage.from_variant (Variant variant) throws Error {
            if (!variant.is_of_type (VariantType.VARDICT)) {
                throw new Mcp.Core.McpError.PARSE_ERROR ("PromptMessage must be a dictionary");
            }
            
            if (variant.lookup_value ("role", null) == null) {
                throw new Mcp.Core.McpError.INVALID_REQUEST ("Missing role in PromptMessage");
            }
            
            if (variant.lookup_value ("content", null) == null) {
                throw new Mcp.Core.McpError.INVALID_REQUEST ("Missing content in PromptMessage");
            }
            
            this.role = variant.lookup_value ("role", VariantType.STRING).get_string ();
            
            var content = variant.lookup_value ("content", VariantType.VARDICT);
            // TODO: Determine content block type and deserialize appropriately
            // For now, assume TextContent
            if (content.lookup_value ("type", null) != null &&
                content.lookup_value ("type", VariantType.STRING).get_string () == "text") {
                this.content = new Mcp.Types.Common.TextContent.from_variant (content);
            } else {
                throw new Mcp.Core.McpError.INVALID_REQUEST ("Unsupported content type in PromptMessage");
            }
        }
    }
}