<?php
require 'db.php';

$projects = $pdo->query("SELECT * FROM projects ORDER BY sort_order ASC")->fetchAll();

foreach ($projects as &$project) {
    $stmt = $pdo->prepare("SELECT * FROM tasks WHERE project_id = ? ORDER BY created_at");
    $stmt->execute([$project['id']]);
    $project['tasks'] = $stmt->fetchAll();

    foreach ($project['tasks'] as &$task) {
        $stmt = $pdo->prepare("SELECT * FROM subtasks WHERE task_id = ? ORDER BY created_at");
        $stmt->execute([$task['id']]);
        $task['subtasks'] = $stmt->fetchAll();
    }
}

echo json_encode($projects);
?>