<?php
require_once 'db/config.php';

// Simple logger
function log_message($message) {
    file_put_contents('debug.log', date('Y-m-d H:i:s') . ' - ' . $message . PHP_EOL, FILE_APPEND);
}

log_message('update_task_status.php accessed.');

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    log_message('Request method is POST.');
    $input_raw = file_get_contents('php://input');
    log_message('Raw input: ' . $input_raw);
    
    $input = json_decode($input_raw, true);
    $taskId = $input['task_id'] ?? null;
    $newStatus = $input['new_status'] ?? null;

    log_message("Parsed input: Task ID = $taskId, New Status = $newStatus");

    if ($taskId && $newStatus) {
        log_message('Task ID and New Status are present. Updating database...');
        try {
            $pdo = db();
            $stmt = $pdo->prepare("UPDATE tasks SET status = :status WHERE id = :id");
            $result = $stmt->execute(['status' => $newStatus, 'id' => $taskId]);

            if ($result && $stmt->rowCount() > 0) {
                log_message('Database update successful. Rows affected: ' . $stmt->rowCount());
                echo json_encode(['success' => true, 'message' => 'Task status updated.']);
            } else {
                log_message('Database update failed or status unchanged. Rows affected: ' . $stmt->rowCount());
                echo json_encode(['success' => false, 'message' => 'Task not found or status unchanged.']);
            }
        } catch (PDOException $e) {
            log_message('Database error: ' . $e->getMessage());
            http_response_code(500);
            echo json_encode(['success' => false, 'message' => 'Database error: ' . $e->getMessage()]);
        }
    } else {
        log_message('Invalid input. Task ID or New Status is missing.');
        http_response_code(400);
        echo json_encode(['success' => false, 'message' => 'Invalid input.']);
    }
} else {
    log_message('Request method not allowed: ' . $_SERVER['REQUEST_METHOD']);
    http_response_code(405);
    echo json_encode(['success' => false, 'message' => 'Method not allowed.']);
}
?>