<?php

declare(strict_types=1);

function docker_sync_env_keys(): array
{
    return [
        'APP_NAME',
        'APP_ENV',
        'APP_KEY',
        'APP_DEBUG',
        'APP_URL',
        'DB_CONNECTION',
        'DB_HOST',
        'DB_PORT',
        'DB_DATABASE',
        'DB_USERNAME',
        'DB_PASSWORD',
        'SESSION_DRIVER',
        'CACHE_STORE',
        'QUEUE_CONNECTION',
    ];
}

function docker_sync_env_format_value(string $value): string
{
    if ($value === '') {
        return '';
    }

    if (preg_match('/\A[A-Za-z0-9_\.\/:@+\-]+\z/', $value) === 1) {
        return $value;
    }

    $escaped = str_replace(
        ["\\", "\"", "\n", "\r"],
        ["\\\\", "\\\"", "\\n", ''],
        $value
    );

    return "\"{$escaped}\"";
}

function docker_sync_env_file(string $path, array $keys, ?array $values = null): void
{
    $lines = file_exists($path) ? file($path, FILE_IGNORE_NEW_LINES) : [];

    if ($lines === false) {
        throw new RuntimeException("Unable to read {$path}.");
    }

    $updates = [];

    foreach ($keys as $key) {
        $value = $values === null ? getenv($key) : ($values[$key] ?? false);

        if ($value === false) {
            continue;
        }

        $updates[$key] = docker_sync_env_format_value((string) $value);
    }

    if ($updates === []) {
        return;
    }

    $seen = [];

    foreach ($lines as $index => $line) {
        foreach ($updates as $key => $value) {
            if (preg_match('/^\s*'.preg_quote($key, '/').'=/i', $line) === 1) {
                $lines[$index] = "{$key}={$value}";
                $seen[$key] = true;
                break;
            }
        }
    }

    foreach ($updates as $key => $value) {
        if (! isset($seen[$key])) {
            $lines[] = "{$key}={$value}";
        }
    }

    $content = implode(PHP_EOL, $lines).PHP_EOL;

    if (file_put_contents($path, $content) === false) {
        throw new RuntimeException("Unable to write {$path}.");
    }
}

$script = isset($_SERVER['SCRIPT_FILENAME']) ? realpath($_SERVER['SCRIPT_FILENAME']) : false;

if ($script !== false && $script === realpath(__FILE__)) {
    $path = $argv[1] ?? dirname(__DIR__).'/.env';

    docker_sync_env_file($path, docker_sync_env_keys());

    fwrite(STDOUT, "Docker environment synchronized into .env.\n");
}