<?php

/**
 * Copyright (C) 2026 Moko Consulting <hello@mokoconsulting.tech>
 *
 * This file is part of a Moko Consulting project.
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 * FILE INFORMATION
 * DEFGROUP: MokoStandards.Enterprise.Plugins
 * INGROUP: MokoStandards
 * REPO: https://git.mokoconsulting.tech/MokoConsulting/moko-platform
 * PATH: /lib/Enterprise/Plugins/McpServerPlugin.php
 * BRIEF: Enterprise plugin for MCP (Model Context Protocol) server projects
 */

declare(strict_types=1);

namespace MokoEnterprise\Plugins;

use MokoEnterprise\AbstractProjectPlugin;

/**
 * MCP Server Project Plugin
 *
 * Provides validation, metrics, and management capabilities for
 * Model Context Protocol server projects — TypeScript/Node.js servers
 * that expose external APIs as AI assistant tools.
 */
class McpServerPlugin extends AbstractProjectPlugin
{
    /**
     * {@inheritdoc}
     */
    public function getProjectType(): string
    {
        return 'mcp-server';
    }

    /**
     * {@inheritdoc}
     */
    public function getPluginName(): string
    {
        return 'MCP Server Enterprise Plugin';
    }

    /**
     * {@inheritdoc}
     */
    public function validateProject(array $config, string $projectPath): array
    {
        $errors = [];
        $warnings = [];

        // Check for required source files
        $requiredSrc = ['src/index.ts', 'src/client.ts', 'src/config.ts', 'src/types.ts'];
        foreach ($requiredSrc as $file) {
            if (!file_exists("{$projectPath}/{$file}")) {
                $errors[] = "Missing required source file: {$file}";
            }
        }

        // Check for package.json with MCP SDK dependency
        if (file_exists("{$projectPath}/package.json")) {
            $content = @file_get_contents("{$projectPath}/package.json");
            if ($content) {
                if (strpos($content, '@modelcontextprotocol/sdk') === false) {
                    $errors[] = 'package.json missing @modelcontextprotocol/sdk dependency';
                }
                if (strpos($content, 'zod') === false) {
                    $warnings[] = 'package.json missing zod dependency (recommended for tool parameter validation)';
                }
            }
        } else {
            $errors[] = 'Missing package.json';
        }

        // Check for tsconfig.json
        if (!file_exists("{$projectPath}/tsconfig.json")) {
            $errors[] = 'Missing tsconfig.json';
        }

        // Check for setup wizard
        if (!file_exists("{$projectPath}/scripts/setup.mjs")) {
            $warnings[] = 'Missing scripts/setup.mjs — interactive setup wizard recommended';
        }

        // Check for config example
        if (!file_exists("{$projectPath}/config.example.json")) {
            $warnings[] = 'Missing config.example.json — example configuration recommended';
        }

        // Check for shebang in index.ts
        if (file_exists("{$projectPath}/src/index.ts")) {
            $content = @file_get_contents("{$projectPath}/src/index.ts");
            if ($content && strpos($content, '#!/usr/bin/env node') === false) {
                $warnings[] = 'src/index.ts should start with #!/usr/bin/env node shebang';
            }
        }

        // Check for McpServer usage
        if (file_exists("{$projectPath}/src/index.ts")) {
            $content = @file_get_contents("{$projectPath}/src/index.ts");
            if ($content && strpos($content, 'McpServer') === false) {
                $errors[] = 'src/index.ts must import and use McpServer from @modelcontextprotocol/sdk';
            }
        }

        // Check for StdioServerTransport
        if (file_exists("{$projectPath}/src/index.ts")) {
            $content = @file_get_contents("{$projectPath}/src/index.ts");
            if ($content && strpos($content, 'StdioServerTransport') === false) {
                $warnings[] = 'src/index.ts should use StdioServerTransport for Claude Code compatibility';
            }
        }

        $this->log(
            'MCP server project validation completed',
            'info',
            ['errors' => count($errors), 'warnings' => count($warnings)]
        );

        return [
            'valid' => empty($errors),
            'errors' => $errors,
            'warnings' => $warnings,
        ];
    }

    /**
     * {@inheritdoc}
     */
    public function collectMetrics(string $projectPath, array $config): array
    {
        $metrics = [
            'has_mcp_sdk' => false,
            'has_zod' => false,
            'has_setup_wizard' => file_exists("{$projectPath}/scripts/setup.mjs"),
            'has_config_example' => file_exists("{$projectPath}/config.example.json"),
            'tool_count' => 0,
            'has_connection_management' => false,
            'has_raw_api_passthrough' => false,
        ];

        // Parse package.json for dependencies
        if (file_exists("{$projectPath}/package.json")) {
            $content = @file_get_contents("{$projectPath}/package.json");
            if ($content) {
                $metrics['has_mcp_sdk'] = strpos($content, '@modelcontextprotocol/sdk') !== false;
                $metrics['has_zod'] = strpos($content, 'zod') !== false;
            }
        }

        // Count registered tools in index.ts
        if (file_exists("{$projectPath}/src/index.ts")) {
            $content = @file_get_contents("{$projectPath}/src/index.ts");
            if ($content) {
                $metrics['tool_count'] = substr_count($content, 'server.tool(');
                $metrics['has_connection_management'] = strpos($content, 'list_connections') !== false;
                $metrics['has_raw_api_passthrough'] = strpos($content, 'api_request') !== false;
            }
        }

        // Count total TypeScript lines
        $tsFiles = $this->findFiles($projectPath, '**/*.ts');
        $totalLines = 0;
        foreach ($tsFiles as $file) {
            if (is_file($file)) {
                $totalLines += count(file($file));
            }
        }
        $metrics['total_lines'] = $totalLines;

        $this->recordMetric('mcp-server', 'tool_count', $metrics['tool_count']);
        $this->recordMetric('mcp-server', 'total_lines', $totalLines);

        $this->log('Collected MCP server metrics', 'info', $metrics);

        return $metrics;
    }

    /**
     * {@inheritdoc}
     */
    public function healthCheck(string $projectPath, array $config): array
    {
        $issues = [];
        $score = 100;

        // Check for required source files
        $requiredSrc = ['src/index.ts', 'src/client.ts', 'src/config.ts', 'src/types.ts'];
        foreach ($requiredSrc as $file) {
            if (!file_exists("{$projectPath}/{$file}")) {
                $issues[] = [
                    'severity' => 'critical',
                    'message' => "Missing required file: {$file}",
                ];
                $score -= 20;
            }
        }

        // Check for MCP SDK
        if (file_exists("{$projectPath}/package.json")) {
            $content = @file_get_contents("{$projectPath}/package.json");
            if ($content && strpos($content, '@modelcontextprotocol/sdk') === false) {
                $issues[] = [
                    'severity' => 'critical',
                    'message' => 'Missing @modelcontextprotocol/sdk dependency',
                ];
                $score -= 25;
            }
        }

        // Check for at least one registered tool
        if (file_exists("{$projectPath}/src/index.ts")) {
            $content = @file_get_contents("{$projectPath}/src/index.ts");
            if ($content) {
                $toolCount = substr_count($content, 'server.tool(');
                if ($toolCount === 0) {
                    $issues[] = [
                        'severity' => 'critical',
                        'message' => 'No MCP tools registered in src/index.ts',
                    ];
                    $score -= 25;
                } elseif ($toolCount < 5) {
                    $issues[] = [
                        'severity' => 'info',
                        'message' => "Only {$toolCount} tools registered — consider adding more coverage",
                    ];
                }
            }
        }

        // Check for README
        if (!$this->fileExists($projectPath, 'README.md')) {
            $issues[] = ['severity' => 'warning', 'message' => 'Missing README.md'];
            $score -= 5;
        }

        // Check for setup wizard
        if (!file_exists("{$projectPath}/scripts/setup.mjs")) {
            $issues[] = ['severity' => 'warning', 'message' => 'Missing interactive setup wizard'];
            $score -= 10;
        }

        // Check for config example
        if (!file_exists("{$projectPath}/config.example.json")) {
            $issues[] = ['severity' => 'warning', 'message' => 'Missing config.example.json'];
            $score -= 5;
        }

        $score = max(0, $score);

        $this->log('MCP server health check completed', 'info', [
            'score' => $score,
            'issues_count' => count($issues),
        ]);

        return [
            'healthy' => $score >= 70,
            'score' => $score,
            'issues' => $issues,
        ];
    }

    /**
     * {@inheritdoc}
     */
    public function getRequiredFiles(): array
    {
        return [
            'src/index.ts — MCP server entry point with tool registrations',
            'src/client.ts — HTTP client for target API',
            'src/config.ts — Multi-connection config loader',
            'src/types.ts — TypeScript interfaces',
            'package.json — with @modelcontextprotocol/sdk and zod',
            'tsconfig.json — TypeScript configuration',
        ];
    }

    /**
     * {@inheritdoc}
     */
    public function getRecommendedFiles(): array
    {
        return [
            'README.md — with tool reference table',
            'config.example.json — example multi-connection config',
            'scripts/setup.mjs — interactive setup wizard',
            'docs/API.md — full tool parameter documentation',
            'docs/ARCHITECTURE.md — component overview and design decisions',
            'docs/INSTALLATION.md — prerequisites and setup guide',
            'Makefile — build automation',
            '.mcp.json — MCP server registration (gitignored)',
        ];
    }

    /**
     * {@inheritdoc}
     */
    public function getConfigSchema(): array
    {
        return [
            'type' => 'object',
            'properties' => [
                'target_api' => [
                    'type' => 'string',
                    'description' => 'Name of the target API (e.g. "Dolibarr", "Joomla")',
                ],
                'auth_method' => [
                    'type' => 'string',
                    'enum' => ['bearer', 'api-key-header', 'basic', 'oauth2'],
                    'description' => 'Authentication mechanism used by the target API',
                ],
                'api_prefix' => [
                    'type' => 'string',
                    'description' => 'API path prefix (e.g. "/api/index.php", "/api/v1")',
                ],
                'transport' => [
                    'type' => 'string',
                    'enum' => ['stdio', 'sse', 'http'],
                    'description' => 'MCP transport type (default: stdio)',
                ],
            ],
            'required' => ['target_api'],
        ];
    }

    /**
     * {@inheritdoc}
     */
    public function getBestPractices(): array
    {
        return [
            'Use Zod schemas for all tool parameter validation',
            'Include a raw API passthrough tool for uncovered endpoints',
            'Support multiple named connections (staging, production, dev)',
            'Include an interactive setup wizard (scripts/setup.mjs)',
            'Use node:https (not fetch) for self-signed cert support',
            'Normalize error responses in formatResponse() helper',
            'Group tools by resource type with section comments',
            'Follow naming convention: prefix_resource_action (snake_case)',
            'Include a list_connections tool for debugging',
            'Document all tools with parameter tables in docs/API.md',
            'Store config in home directory (~/.project-name.json)',
            'Support config path override via environment variable',
            'Use StdioServerTransport for Claude Code compatibility',
            'Include config.example.json with multi-connection example',
        ];
    }
}