import express, { Request, Response, Router } from 'express';
import rateLimit from 'express-rate-limit';
import Location from '../models/Location';
import ProfanityFilterService from '../services/ProfanityFilterService';

// Define interfaces for request bodies
interface LocationPostRequest extends Request {
    body: {
        address: string;
        latitude?: number;
        longitude?: number;
        description?: string;
    };
}


export default (locationModel: Location, profanityFilter: ProfanityFilterService | any): Router => {
  const router = express.Router();

  // Rate limiting for location submissions to prevent abuse
  const submitLocationLimiter = rateLimit({
    windowMs: 15 * 60 * 1000, // 15 minutes
    limit: 10, // Limit each IP to 10 location submissions per 15 minutes
    message: {
      error: 'Too many location reports submitted',
      message: 'You can submit up to 10 location reports every 15 minutes. Please wait before submitting more.',
      retryAfter: '15 minutes'
    },
    standardHeaders: true, // Return rate limit info in the `RateLimit-*` headers
    legacyHeaders: false, // Disable the `X-RateLimit-*` headers
    // Skip rate limiting in test environment
    skip: () => process.env.NODE_ENV === 'test'
  });

  /**
     * @swagger
     * /api/locations:
     *   get:
     *     tags:
     *       - Public API
     *     summary: Get active ice condition reports
     *     description: |
     *       Retrieves all active ice condition reports. Reports are considered active if they are:
     *       - Less than 48 hours old, OR
     *       - Marked as persistent by an administrator
     *     responses:
     *       200:
     *         description: Active locations retrieved successfully
     *         content:
     *           application/json:
     *             schema:
     *               type: array
     *               items:
     *                 $ref: '#/components/schemas/Location'
     *             examples:
     *               active_locations:
     *                 summary: Example active locations
     *                 value:
     *                   - id: 123
     *                     address: "Main St & Oak Ave, Grand Rapids, MI"
     *                     latitude: 42.9634
     *                     longitude: -85.6681
     *                     description: "Black ice present, multiple vehicles stuck"
     *                     persistent: false
     *                     created_at: "2025-01-15T10:30:00.000Z"
     *                   - id: 124
     *                     address: "I-96 & US-131, Grand Rapids, MI"
     *                     latitude: 42.9584
     *                     longitude: -85.6706
     *                     description: "Icy on-ramp conditions"
     *                     persistent: true
     *                     created_at: "2025-01-14T08:15:00.000Z"
     *       500:
     *         description: Internal server error
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
  router.get('/', async (req: Request, res: Response): Promise<void> => {
    console.log('Fetching active locations');

    try {
      const locations = await locationModel.getActive();
      console.log(`Fetched ${locations.length} active locations (including persistent)`);
      res.json(locations);
    } catch (err) {
      console.error('Error fetching locations:', err);
      res.status(500).json({ error: 'Internal server error' });
    }
  });

  /**
     * @swagger
     * /api/locations:
     *   post:
     *     tags:
     *       - Public API
     *     summary: Report a new ice condition
     *     description: |
     *       Submit a new ice condition report. The system will:
     *       - Validate the address is provided
     *       - Check description for profanity and reject if found
     *       - Geocode the address if coordinates not provided
     *       - Store the report for 48 hours (unless made persistent by admin)
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             $ref: '#/components/schemas/LocationInput'
     *           examples:
     *             basic_report:
     *               summary: Basic ice report with address only
     *               value:
     *                 address: "Main St & Oak Ave, Grand Rapids, MI"
     *                 description: "Black ice spotted, drive carefully"
     *             detailed_report:
     *               summary: Detailed report with coordinates
     *               value:
     *                 address: "I-96 westbound at Exit 85"
     *                 latitude: 42.9634
     *                 longitude: -85.6681
     *                 description: "Multiple vehicles stuck, road salt needed"
     *     responses:
     *       200:
     *         description: Location report created successfully
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Location'
     *             example:
     *               id: 125
     *               address: "Main St & Oak Ave, Grand Rapids, MI"
     *               latitude: 42.9634
     *               longitude: -85.6681
     *               description: "Black ice spotted, drive carefully"
     *               persistent: false
     *               created_at: "2025-01-15T12:00:00.000Z"
     *       400:
     *         description: Bad request - invalid input or profanity detected
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *             examples:
     *               missing_address:
     *                 summary: Missing required address field
     *                 value:
     *                   error: "Address is required"
     *               profanity_detected:
     *                 summary: Profanity detected in description
     *                 value:
     *                   error: "Submission rejected"
     *                   message: "Your description contains inappropriate language and cannot be posted. Please revise your description to focus on road conditions and keep it professional."
     *                   details:
     *                     severity: "medium"
     *                     wordCount: 1
     *                     detectedCategories: ["general"]
     *       500:
     *         description: Internal server error
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
  router.post('/', submitLocationLimiter, async (req: LocationPostRequest, res: Response): Promise<void> => {
    const { address, latitude, longitude, description } = req.body;
    console.log(`Attempt to add new location: ${address}`);

    // Input validation for security
    if (!address) {
      console.warn('Failed to add location: Address is required');
      res.status(400).json({ error: 'Address is required' });
      return;
    }

    if (typeof address !== 'string' || address.length > 500) {
      console.warn(`Failed to add location: Invalid address length (${address?.length || 0})`);
      res.status(400).json({ error: 'Address must be a string with maximum 500 characters' });
      return;
    }

    if (description && (typeof description !== 'string' || description.length > 1000)) {
      console.warn(`Failed to add location: Invalid description length (${description?.length || 0})`);
      res.status(400).json({ error: 'Description must be a string with maximum 1000 characters' });
      return;
    }

    // Validate latitude if provided
    if (latitude !== undefined && (typeof latitude !== 'number' || latitude < -90 || latitude > 90)) {
      console.warn(`Failed to add location: Invalid latitude (${latitude})`);
      res.status(400).json({ error: 'Latitude must be a number between -90 and 90' });
      return;
    }

    // Validate longitude if provided
    if (longitude !== undefined && (typeof longitude !== 'number' || longitude < -180 || longitude > 180)) {
      console.warn(`Failed to add location: Invalid longitude (${longitude})`);
      res.status(400).json({ error: 'Longitude must be a number between -180 and 180' });
      return;
    }

    // Log suspicious activity
    if (address.length > 200 || (description && description.length > 500)) {
      console.warn(`Unusually long submission from IP: ${req.ip} - Address: ${address.length} chars, Description: ${description?.length || 0} chars`);
    }

    // Check for profanity in description and reject if any is found
    if (description && profanityFilter) {
      try {
        const analysis = profanityFilter.analyzeProfanity(description);
        if (analysis.hasProfanity) {
          console.warn(`Submission rejected due to inappropriate language (${analysis.count} word${analysis.count > 1 ? 's' : ''}, severity: ${analysis.severity}) - Original: "${req.body.description}"`);

          // Reject any submission with profanity
          res.status(400).json({
            error: 'Submission rejected',
            message: 'Your description contains inappropriate language and cannot be posted. Please revise your description to focus on road conditions and keep it professional.\n\nExample: "Multiple vehicles stuck, black ice present" or "Road very slippery, saw 3 accidents"',
            details: {
              severity: analysis.severity,
              wordCount: analysis.count,
              detectedCategories: [...new Set(analysis.matches.map((m: any) => m.category))]
            }
          });
          return;
        }
      } catch (filterError) {
        console.error('Error checking profanity:', filterError);
        // Continue with original description if filter fails
      }
    }

    try {
      const newLocation = await locationModel.create({
        address,
        latitude,
        longitude,
        description
      });

      console.log(`Location added successfully: ${address}`);
      res.json({
        ...newLocation,
        created_at: new Date().toISOString()
      });
    } catch (err) {
      console.error('Error inserting location:', err);
      res.status(500).json({ error: 'Internal server error' });
    }
  });

  // DELETE functionality has been moved to admin-only routes for security.
  // Use /api/admin/locations/:id (with authentication) for location deletion.

  return router;
};