import type { NocoDBSettings } from '~/utils/types';

export default defineEventHandler(async (event) => {
  console.log('[api/admin/nocodb-test.post] =========================');
  console.log('[api/admin/nocodb-test.post] POST /api/admin/nocodb-test');
  console.log('[api/admin/nocodb-test.post] Request from:', getClientIP(event));

  try {
    // Check admin authorization
    const sessionManager = createSessionManager();
    const cookieHeader = getHeader(event, 'cookie');
    const session = sessionManager.getSession(cookieHeader);

    if (!session?.user) {
      throw createError({
        statusCode: 401,
        statusMessage: 'Authentication required'
      });
    }

    // Check if user is admin
    if (session.user.tier !== 'admin') {
      throw createError({
        statusCode: 403,
        statusMessage: 'Admin access required'
      });
    }

    console.log('[api/admin/nocodb-test.post] Admin access confirmed for:', session.user.email);

    // Get request body - this contains the settings to test
    const body = await readBody(event) as NocoDBSettings;
    
    // Validate required fields
    if (!body.url || !body.apiKey || !body.baseId || !body.tables || Object.keys(body.tables).length === 0) {
      return {
        success: false,
        message: 'All fields are required to test connection (url, apiKey, baseId, and at least one table)'
      };
    }

    // Validate URL format
    if (!body.url.startsWith('http://') && !body.url.startsWith('https://')) {
      return {
        success: false,
        message: 'URL must start with http:// or https://'
      };
    }

    // Validate API token format - check for non-ASCII characters that would cause ByteString errors
    const apiKey = body.apiKey.trim();
    if (!/^[\x00-\xFF]*$/.test(apiKey)) {
      return {
        success: false,
        message: 'API token contains invalid characters. Please ensure you copied the token correctly without any special formatting characters.'
      };
    }

    // Additional validation for common token issues
    if (apiKey.includes('•') || apiKey.includes('…') || apiKey.includes('"') || apiKey.includes('"')) {
      return {
        success: false,
        message: 'API token contains formatting characters (bullets, quotes, etc.). Please copy the raw token from NocoDB without any formatting.'
      };
    }

    console.log('[api/admin/nocodb-test.post] Testing NocoDB connection...');
    console.log('[api/admin/nocodb-test.post] URL:', body.url);
    console.log('[api/admin/nocodb-test.post] Base ID:', body.baseId);
    console.log('[api/admin/nocodb-test.post] Tables:', Object.keys(body.tables));

    try {
      // Test connection by making a simple request to NocoDB using the first table
      const firstTableName = Object.keys(body.tables)[0];
      const firstTableId = body.tables[firstTableName];
      const testUrl = `${body.url}/api/v2/tables/${firstTableId}/records?limit=1`;
      
      console.log('[api/admin/nocodb-test.post] Testing URL:', testUrl);
      
      const response = await $fetch(testUrl, {
        method: 'GET',
        headers: {
          'xc-token': body.apiKey,
          'Content-Type': 'application/json'
        },
        // Add timeout to prevent hanging
        timeout: 10000
      });

      console.log('[api/admin/nocodb-test.post] ✅ Connection successful');
      console.log('[api/admin/nocodb-test.post] Response received, type:', typeof response);

      return {
        success: true,
        message: 'Connection successful! NocoDB is responding.'
      };

    } catch (connectionError: any) {
      console.error('[api/admin/nocodb-test.post] ❌ Connection failed:', connectionError);
      
      let errorMessage = 'Connection failed';
      
      if (connectionError.statusCode === 401 || connectionError.status === 401) {
        errorMessage = 'Authentication failed - please check your API token';
      } else if (connectionError.statusCode === 404 || connectionError.status === 404) {
        errorMessage = 'Table not found - please check your Base ID and Table ID';
      } else if (connectionError.statusCode === 403 || connectionError.status === 403) {
        errorMessage = 'Access denied - please check your API token permissions';
      } else if (connectionError.code === 'NETWORK_ERROR' || connectionError.message?.includes('fetch')) {
        errorMessage = 'Network error - please check the URL and ensure NocoDB is accessible';
      } else if (connectionError.message?.includes('timeout')) {
        errorMessage = 'Connection timeout - NocoDB server may be unavailable';
      } else if (connectionError.message) {
        errorMessage = connectionError.message;
      }

      return {
        success: false,
        message: errorMessage
      };
    }

  } catch (error: any) {
    console.error('[api/admin/nocodb-test.post] ❌ Error:', error);
    
    if (error.statusCode) {
      throw error; // Re-throw HTTP errors
    }

    return {
      success: false,
      message: 'Failed to test connection due to server error'
    };
  }
});