server/src/controllers/recommendationController.js

const User = require('../models/User');

const getRecommendations = async (req, res) => {
    try {
        const { budget, lat, lng, specialty } = req.query;

        // 1. Fetch photographers with matching specialty
        let query = { role: 'photographer' };
        if (specialty) {
            query.specialty = { $regex: specialty, $options: 'i' };
        }

        const photographers = await User.find(query).select('-password');

        // 2. Scoring Algorithm
        const scoredPhotographers = photographers.map(pg => {
            let score = 0;

            // Rating Score (0-40 points)
            score += (pg.rating || 0) * 8; // rating 5.0 -> 40 points

            // Budget Score (0-30 points)
            if (budget) {
                const userBudget = parseFloat(budget);
                if (pg.price <= userBudget) {
                    score += 30; // Within budget
                } else if (pg.price <= userBudget * 1.5) {
                    score += 15; // Slightly over budget
                }
            } else {
                score += 20; // Default budget score
            }

            // Proximity Score (0-30 points) - Placeholder for now
            // In a real app, use geodist or similar
            if (lat && lng && pg.location && pg.location.coordinates) {
                const dist = Math.sqrt(
                    Math.pow(pg.location.coordinates[1] - parseFloat(lat), 2) +
                    Math.pow(pg.location.coordinates[0] - parseFloat(lng), 2)
                );
                if (dist < 0.1) score += 30; // Very close
                else if (dist < 1) score += 15; // Moderately close
            } else {
                score += 15; // Default proximity score
            }

            return { ...pg.toObject(), recommendationScore: score };
        });

        // 3. Sort by score and return top results
        const sorted = scoredPhotographers.sort((a, b) => b.recommendationScore - a.recommendationScore);
        res.json(sorted.slice(0, 5));
    } catch (error) {
        res.status(500).json({ message: error.message });
    }
};

module.exports = { getRecommendations };