/*
┌──────────────────────────────────────────────────────────────────┐
│  Author: Ivan Murzak (https://github.com/IvanMurzak)             │
│  Repository: GitHub (https://github.com/IvanMurzak/Unity-MCP)    │
│  Copyright (c) 2025 Ivan Murzak                                  │
│  Licensed under the Apache License, Version 2.0.                 │
│  See the LICENSE file in the project root for more information.  │
└──────────────────────────────────────────────────────────────────┘
*/

#nullable enable
using System.IO;
using System.Text.Json.Nodes;
using com.IvanMurzak.Unity.MCP.Editor.Utils;
using UnityEngine.UIElements;
using static com.IvanMurzak.McpPlugin.Common.Consts.MCP.Server;

namespace com.IvanMurzak.Unity.MCP.Editor.UI
{
    /// <summary>
    /// Configurator for Unity AI agent.
    /// </summary>
    public class UnityAiConfigurator : AiAgentConfigurator
    {
        public override string AgentName => "Unity AI";
        public override string AgentId => "unity-ai";
        public override string DownloadUrl => "https://unity.com/features/ai";

        protected override string? IconFileName => "unity-64.png";

        private static string LocalConfigPath => Path.Combine(ProjectRootPath, "UserSettings", "mcp.json");

        protected override AiAgentConfig CreateConfigStdioWindows() => new JsonAiAgentConfig(
            name: AgentName,
            configPath: LocalConfigPath,
            bodyPath: DefaultBodyPath
        )
        .SetProperty("type", JsonValue.Create("stdio"), requiredForConfiguration: true)
        .SetProperty("command", JsonValue.Create(McpServerManager.ExecutableFullPath.Replace('\\', '/')), requiredForConfiguration: true, comparison: ValueComparisonMode.Path)
        .SetProperty("args", new JsonArray {
            $"{Args.Port}={UnityMcpPluginEditor.Port}",
            $"{Args.PluginTimeout}={UnityMcpPluginEditor.TimeoutMs}",
            $"{Args.ClientTransportMethod}={TransportMethod.stdio}",
            $"{Args.Authorization}={UnityMcpPluginEditor.AuthOption}",
            $"{Args.Token}={UnityMcpPluginEditor.Token}"
        }, requiredForConfiguration: true)
        .SetPropertyToRemove("url");

        protected override AiAgentConfig CreateConfigStdioMacLinux() => new JsonAiAgentConfig(
            name: AgentName,
            configPath: LocalConfigPath,
            bodyPath: DefaultBodyPath
        )
        .SetProperty("type", JsonValue.Create("stdio"), requiredForConfiguration: true)
        .SetProperty("command", JsonValue.Create(McpServerManager.ExecutableFullPath.Replace('\\', '/')), requiredForConfiguration: true, comparison: ValueComparisonMode.Path)
        .SetProperty("args", new JsonArray {
            $"{Args.Port}={UnityMcpPluginEditor.Port}",
            $"{Args.PluginTimeout}={UnityMcpPluginEditor.TimeoutMs}",
            $"{Args.ClientTransportMethod}={TransportMethod.stdio}",
            $"{Args.Authorization}={UnityMcpPluginEditor.AuthOption}",
            $"{Args.Token}={UnityMcpPluginEditor.Token}"
        }, requiredForConfiguration: true)
        .SetPropertyToRemove("url");

        protected override AiAgentConfig CreateConfigHttpWindows() => new JsonAiAgentConfig(
            name: AgentName,
            configPath: LocalConfigPath,
            bodyPath: DefaultBodyPath
        )
        .SetProperty("type", JsonValue.Create("http"), requiredForConfiguration: true)
        .SetProperty("url", JsonValue.Create(UnityMcpPluginEditor.Host), requiredForConfiguration: true, comparison: ValueComparisonMode.Url)
        .SetPropertyToRemove("command")
        .SetPropertyToRemove("args");

        protected override AiAgentConfig CreateConfigHttpMacLinux() => new JsonAiAgentConfig(
            name: AgentName,
            configPath: LocalConfigPath,
            bodyPath: DefaultBodyPath
        )
        .SetProperty("type", JsonValue.Create("http"), requiredForConfiguration: true)
        .SetProperty("url", JsonValue.Create(UnityMcpPluginEditor.Host), requiredForConfiguration: true, comparison: ValueComparisonMode.Url)
        .SetPropertyToRemove("command")
        .SetPropertyToRemove("args");

        protected override void OnUICreated(VisualElement root)
        {
            base.OnUICreated(root);

            // STDIO Configuration

            var requiresStepsStdio = TemplateFoldoutFirst("Configuration Steps");
            requiresStepsStdio.value = true;

            requiresStepsStdio.Add(TemplateLabelDescription("1. Open the Project Settings in Unity Editor:\n- Go to Edit > Project Settings > AI > MCP Servers"));
            requiresStepsStdio.Add(TemplateLabelDescription("2. Enable MCP Tools"));
            requiresStepsStdio.Add(TemplateLabelDescription("3. Click 'Refresh File and Servers' button"));
            requiresStepsStdio.Add(TemplateLabelDescription("4. (optional) Inspect 'ai-game-developer' at the bottom of this window. It must have green status and to have some amount of available tools. If not, click 'Restart ai-game-developer' button and check the status again."));

            ContainerStdio!.Add(requiresStepsStdio);

            var manualStepsContainer = TemplateFoldout("Manual Configuration Steps");

            manualStepsContainer!.Add(TemplateLabelDescription("1. Open or create file 'UserSettings/mcp.json'"));
            manualStepsContainer!.Add(TemplateLabelDescription("2. Copy and paste the configuration json into the file."));
            manualStepsContainer!.Add(TemplateTextFieldReadOnly(ConfigStdio.ExpectedFileContent));

            ContainerStdio!.Add(manualStepsContainer);

            var troubleshootingContainerStdio = TemplateFoldout("Troubleshooting");

            troubleshootingContainerStdio.Add(TemplateLabelDescription("- 'UserSettings/mcp.json' file must have no json syntax errors."));
            troubleshootingContainerStdio.Add(TemplateLabelDescription("- Open Unity AI settings window\n- Go to Edit > Project Settings > AI > MCP Servers\n- Click 'Restart ai-game-developer' button or check the status of the server."));

            ContainerStdio!.Add(troubleshootingContainerStdio);

            // HTTP Configuration

            ContainerHttp!.Add(TemplateAlertLabel("Please consider to switch to STDIO transport for local development."));

            ContainerHttp!.Add(TemplateWarningLabel("Unity AI agent is cloud based. To use HTTP transport you must to host MCP server in a cloud with https public access. You may use docker for that. Avoid using 'localhost' in your url."));

            var requiresStepsHttp = TemplateFoldoutFirst("Configuration Steps");
            requiresStepsHttp.value = true;

            requiresStepsHttp.Add(TemplateLabelDescription("1. Open the Project Settings in Unity Editor:\n- Go to Edit > Project Settings > AI > MCP Servers"));
            requiresStepsHttp.Add(TemplateLabelDescription("2. Enable MCP Tools"));
            requiresStepsHttp.Add(TemplateLabelDescription("3. Click 'Refresh File and Servers' button"));
            requiresStepsHttp.Add(TemplateLabelDescription("4. (optional) Inspect 'ai-game-developer' at the bottom of this window. It must have green status and to have some amount of available tools. If not, click 'Restart ai-game-developer' button and check the status again."));

            ContainerHttp!.Add(requiresStepsHttp);

            var manualStepsContainerHttp = TemplateFoldoutFirst("Manual Configuration Steps");

            manualStepsContainerHttp!.Add(TemplateLabelDescription("1. Open or create file 'UserSettings/mcp.json'"));
            manualStepsContainerHttp!.Add(TemplateLabelDescription("2. Copy and paste the configuration json into the file."));
            manualStepsContainerHttp!.Add(TemplateTextFieldReadOnly(ConfigHttp.ExpectedFileContent));

            ContainerHttp!.Add(manualStepsContainerHttp);

            var troubleshootingContainerHttp = TemplateFoldout("Troubleshooting");

            troubleshootingContainerHttp.Add(TemplateLabelDescription("- 'UserSettings/mcp.json' file must have no json syntax errors."));
            troubleshootingContainerHttp.Add(TemplateLabelDescription("- Open Unity AI settings window\n- Go to Edit > Project Settings > AI > MCP Servers\n- Click 'Restart ai-game-developer' button or check the status of the server."));

            ContainerHttp!.Add(troubleshootingContainerHttp);
        }
    }
}