<?php
//defined($security_key) or exit;

//------------------------------------------
// Communication Log API endpoint
// Stores all USB serial communication data in date-organized files
//------------------------------------------
$request = explode('/', trim($_SERVER['PATH_INFO'],'/'));

//------------------------------------------
// Application related calls
//------------------------------------------
$action = $request[2];
$post_content = json_decode($input,true);

//SET PARAMETERS FOR QUERY
$date = date('Y-m-d H:i:s');
$current_date = date('Y-m-d');

// Connect to DB (if needed for future enhancements)
$pdo = dbConnect($dbname);

if ($action == 'log'){

    // Validate input data
    if (!empty($post_content['data']) && isset($post_content['direction'])) {

        $communication_data = $post_content['data'];
        $direction = $post_content['direction']; // 'sent' or 'received'
        $timestamp = $post_content['timestamp'] ?? $date;
        $serial_number = $post_content['serial_number'] ?? '';
        $maintenance_run = $post_content['maintenance_run'] ?? 0;

        // Create log directory if it doesn't exist
        $log_dir = './log/';
        if (!is_dir($log_dir)) {
            mkdir($log_dir, 0755, true);
        }

        // Create filename based on current date (YYYY-MM-DD)
        $log_file = $log_dir .'serial'. $current_date . '.log';

        // Format log entry
        $log_entry = sprintf(
            "[%s] [%s] [SN:%s] [MAINT:%d] %s: %s\n",
            $timestamp,
            $direction,
            $serial_number,
            $maintenance_run,
            strtoupper($direction),
            $communication_data
        );

        // Append to log file
        if (file_put_contents($log_file, $log_entry, FILE_APPEND | LOCK_EX) !== false) {
            // Success response
            echo json_encode(array(
                'status' => 'success',
                'message' => 'Communication logged successfully',
                'file' => $log_file
            ));
        } else {
            // Error response
            http_response_code(500);
            echo json_encode(array(
                'status' => 'error',
                'message' => 'Failed to write to log file'
            ));
        }

    } else {
        // Invalid payload
        http_response_code(400);
        echo json_encode(array(
            'status' => 'error',
            'message' => 'Invalid payload: missing data or direction'
        ));
    }

} else {
    // Invalid action
    http_response_code(400);
    echo json_encode(array(
        'status' => 'error',
        'message' => 'Invalid action'
    ));
}
?>