<?php

namespace Api\Controllers;

use Api\Core\Controller;
use Api\Core\Response;
use Api\Core\Auth;

class LeaderboardController extends Controller {
    public function index() {
        $user = Auth::getUser();
        if (!$user) return Response::error('Unauthorized', 401);

        $db = db();
        $schoolId = $user['school_id'];

        // Get learners with their average marks
        $sql = "SELECT l.id, l.full_name, AVG(m.marks_obtained / a.total_marks * 100) as average_percent 
                FROM learners l 
                JOIN marks m ON l.id = m.learner_id 
                JOIN assessments a ON m.assessment_id = a.id 
                WHERE l.school_id = :school_id 
                GROUP BY l.id 
                ORDER BY average_percent DESC";
        
        $stmt = $db->prepare($sql);
        $stmt->execute(['school_id' => $schoolId]);
        $leaderboard = $stmt->fetchAll();

        Response::json($leaderboard);
    }
}