#!/usr/bin/env node
/**
 * Memento MCP Server - Test Suite
 *
 * Run with: npm test
 */

import { describe, it, expect, beforeAll, afterAll } from 'vitest';
import { fileURLToPath } from 'url';
import { dirname, join } from 'path';

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

const projectRoot = join(__dirname, '..');

// Import modules to test
import { mcpError, validationError, notFoundError, authError, McpErrors } from '../errors.js';
import { validateConfig } from '../config.js';
import { validateToolInput, validateAndSanitize, checkXSS } from '../validation.js';
import { checkRateLimit, resetRateLimit, getRateLimitStats } from '../rate-limit.js';
import { getMetrics, getPrometheusMetrics, recordRequest, resetMetrics } from '../metrics.js';

describe('MCP Server - Error Handling', () => {
  it('should create a structured error', () => {
    const error = mcpError(McpErrors.INVALID_PARAMS.code, {
      detail: 'Test error',
      field: 'testField',
    });

    expect(error).toHaveProperty('_error', true);
    expect(error).toHaveProperty('code', McpErrors.INVALID_PARAMS.code);
    expect(error).toHaveProperty('message', 'Invalid params');
    expect(error).toHaveProperty('detail', 'Test error');
    expect(error).toHaveProperty('field', 'testField');
  });

  it('should create a validation error', () => {
    const error = validationError('title', 'Title is required');

    expect(error).toHaveProperty('code', McpErrors.INVALID_PARAMS.code);
    expect(error).toHaveProperty('field', 'title');
    expect(error).toHaveProperty('detail', 'Title is required');
  });

  it('should create a not found error', () => {
    const error = notFoundError('Note', '123');

    expect(error).toHaveProperty('code', McpErrors.NOT_FOUND.code);
    expect(error.detail).toContain('Note not found');
  });

  it('should create an auth error', () => {
    const error = authError('Invalid API key');

    expect(error).toHaveProperty('code', McpErrors.AUTH_FAILED.code);
    expect(error).toHaveProperty('detail', 'Invalid API key');
  });
});

describe('MCP Server - Configuration', () => {
  it('should validate missing DATABASE_URL', () => {
    const originalDbUrl = process.env.DATABASE_URL;
    delete process.env.DATABASE_URL;

    const errors = validateConfig();
    const dbError = errors.find((e) => e.key === 'DATABASE_URL');

    expect(dbError).toBeDefined();
    expect(dbError.critical).toBe(true);

    process.env.DATABASE_URL = originalDbUrl;
  });

  it('should validate port range', () => {
    const originalPort = process.env.PORT;
    process.env.PORT = '99999';

    const errors = validateConfig();
    const portError = errors.find((e) => e.key === 'PORT');

    expect(portError).toBeDefined();

    process.env.PORT = originalPort;
  });
});

describe('MCP Server - Input Validation', () => {
  it('should validate create_note input', () => {
    const result = validateToolInput('create_note', {
      title: 'Test Note',
      content: 'Test content',
      color: 'blue',
    });

    expect(result.success).toBe(true);
    expect(result.data.title).toBe('Test Note');
    expect(result.data.content).toBe('Test content');
  });

  it('should reject invalid create_note input', () => {
    const result = validateToolInput('create_note', {
      // Missing required 'content' field
    });

    expect(result.success).toBe(false);
    expect(result.errors).toBeDefined();
    expect(result.errors.length).toBeGreaterThan(0);
  });

  it('should reject invalid color', () => {
    const result = validateToolInput('create_note', {
      content: 'Test',
      color: 'invalid-color',
    });

    expect(result.success).toBe(false);
  });

  it('should detect XSS attempts', () => {
    const xss = checkXSS({ content: '<script>alert("xss")</script>' });
    expect(xss).toBe(true);
  });

  it('should allow safe HTML', () => {
    const xss = checkXSS({ content: 'Hello <em>world</em>' });
    // This will be true because we check for any HTML tags
    // In production, you might want more sophisticated checking
    expect(xss).toBe(true);
  });

  it('should sanitize input', () => {
    const result = validateAndSanitize('create_note', {
      content: 'Test content',
    });

    expect(result.success).toBe(true);
  });
});

describe('MCP Server - Metrics', () => {
  beforeEach(() => {
    resetMetrics();
  });

  it('should record requests', () => {
    recordRequest('create_note', 200, 'POST', 100);
    recordRequest('get_notes', 200, 'GET', 50);

    const metrics = getMetrics();
    expect(metrics.requests.total).toBe(2);
    expect(metrics.requests.byTool.create_note).toBe(1);
    expect(metrics.requests.byTool.get_notes).toBe(1);
  });

  it('should calculate latency percentiles', () => {
    for (let i = 0; i < 100; i++) {
      recordRequest('test', 200, 'GET', i);
    }

    const metrics = getMetrics();
    expect(metrics.latency.p50).toBeGreaterThan(0);
    expect(metrics.latency.p95).toBeGreaterThan(metrics.latency.p50);
  });

  it('should export Prometheus metrics', () => {
    recordRequest('create_note', 200, 'POST', 100);

    const promMetrics = getPrometheusMetrics();
    expect(promMetrics).toContain('mcp_requests_total');
    expect(promMetrics).toContain('mcp_latency_ms');
  });
});

describe('MCP Server - Rate Limiting', () => {
  it('should rate limit requests', () => {
    // This is a basic test - actual rate limiting requires more setup
    const stats = getRateLimitStats();
    expect(stats).toHaveProperty('store');
    expect(stats).toHaveProperty('config');
  });
});

describe('MCP Server - Tool Definitions', () => {
  const toolNames = [
    'create_note',
    'get_notes',
    'get_note',
    'update_note',
    'delete_note',
    'search_notes',
    'move_note',
    'toggle_pin',
    'toggle_archive',
    'batch_move_notes',
    'batch_delete_notes',
    'create_notebook',
    'get_notebooks',
    'get_notebook',
    'update_notebook',
    'delete_notebook',
    'reorder_notebooks',
    'get_notebook_hierarchy',
    'create_label',
    'get_labels',
    'update_label',
    'delete_label',
    'get_due_reminders',
    'export_notes',
    'import_notes',
  ];

  it('should have all expected tools with schemas', () => {
    const { toolSchemas } = await import('../validation.js');

    for (const toolName of toolNames) {
      expect(toolSchemas[toolName]).toBeDefined();
    }
  });
});

// Run tests
console.log('Running MCP Server tests...');