<?php
/**
 * Copyright since 2014 Waynet Sp. z o.o.
 * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.md.
 * It is also available through the world-wide-web at this URL:
 * https://opensource.org/licenses/OSL-3.0
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to kontakt@waynet.pl so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
 * versions in the future. If you wish to customize PrestaShop for your
 * needs please refer to https://devdocs.prestashop-project.org/ for more information.
 *
 * @author    Waynet Sp. z o.o. <kontakt@waynet.pl>
 * @copyright since 2014 Waynet Sp. z o.o.
 * @license   https://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
 */

declare(strict_types=1);

namespace Waynet\Security;

use Symfony\Component\Dotenv\Dotenv;
use Symfony\Component\Dotenv\Exception\PathException;

class Environment
{
    private const API_URL = 'WNET_SECURITY_API_URL';
    private const OAUTH_SERVER_URL = 'WNET_SECURITY_OAUTH_SERVER_URL';
    private const OAUTH_TOKEN_ENDPOINT_URI = 'WNET_SECURITY_OAUTH_TOKEN_ENDPOINT_URI';
    private const OAUTH_CLIENT_REGISTRATION_ENDPOINT_URI = 'WNET_SECURITY_OAUTH_CLIENT_REGISTRATION_ENDPOINT';
    private const PS_BILLING_SANDBOX = 'WNET_SECURITY_PS_BILLING_SANDBOX';

    private $path;
    private $environment;
    private $dotenv;
    private $loaded = false;
    private $values = [];

    public function __construct(
        string $directory,
        string $environment = null,
        Dotenv $dotenv = null
    ) {
        if (null === $environment) {
            $environment = defined('_PS_MODE_DEV_') && _PS_MODE_DEV_ ? 'dev' : 'prod';
        }

        $this->path = rtrim($directory, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR . '.env';
        $this->environment = $environment;
        $this->dotenv = $dotenv ?? new Dotenv();
    }

    public function getApiUrl(): string
    {
        return (string) $this->get(self::API_URL);
    }

    public function getOAuthServerUrl(): string
    {
        return (string) $this->get(self::OAUTH_SERVER_URL);
    }

    public function getOAuthTokenEndpointUri(): string
    {
        return (string) $this->get(self::OAUTH_TOKEN_ENDPOINT_URI);
    }

    public function getOAuthClientRegistrationEndpointUri(): string
    {
        return (string) $this->get(self::OAUTH_CLIENT_REGISTRATION_ENDPOINT_URI);
    }

    public function useSandboxBilling(): bool
    {
        return (bool) $this->get(self::PS_BILLING_SANDBOX);
    }

    public function getPsAccountsVersion(): string
    {
        return \Tools::version_compare($this->getPrestaShopVersion(), '8.0.0')
            ? '5.0'
            : '6.0';
    }

    public function getPrestaShopVersion(): string
    {
        return _PS_VERSION_;
    }

    private function get(string $key)
    {
        if (array_key_exists($key, $_ENV)) {
            return $_ENV[$key];
        }

        if (!$this->loaded) {
            $this->load();
        }

        if (!isset($this->values[$key])) {
            throw new \RuntimeException(sprintf('Environment variable "%s" is not set', $key));
        }

        return $this->values[$key];
    }

    private function load(): void
    {
        $this->values = array_merge(...array_map(function ($path) {
            if (!is_readable($path) || is_dir($path)) {
                throw new PathException($path);
            }

            return $this->dotenv->parse(\Tools::file_get_contents($path), $path);
        }, $this->getPaths()));

        $this->loaded = true;
    }

    /** @return string[] */
    private function getPaths(): array
    {
        $paths = [];

        if (is_file($this->path)) {
            $paths[] = $this->path;
        }

        if (is_file($path = $this->path . '.local')) {
            $paths[] = $path;
        }

        if (is_file($path = $this->path . '.' . $this->environment)) {
            $paths[] = $path;
        }

        if (is_file($path .= '.local')) {
            $paths[] = $path;
        }

        return $paths;
    }
}