<?php

namespace App\Space;

use App\Http\Requests\DatabaseEnvironmentRequest;
use App\Http\Requests\DomainEnvironmentRequest;
use App\Http\Requests\PDFConfigurationRequest;
use Exception;
use Illuminate\Support\Facades\Artisan;
use Illuminate\Support\Facades\DB;

class EnvironmentManager
{
    /**
     * @var string
     */
    private $envPath;

    /**
     * @var string
     */
    private $delimiter = "\n";

    /**
     * Set the .env and .env.example paths.
     */
    public function __construct($path = null)
    {
        $this->envPath = base_path('.env');
    }

    /**
     * Returns the .env contents
     *
     * @return false|string
     */
    private function getEnvContents()
    {
        return file_get_contents($this->envPath);
    }

    /**
     * Updates .env file - inspired by Akaunting
     *
     * @return bool
     */
    public function updateEnv(array $data)
    {
        if (empty($data) || ! is_array($data) || ! is_file($this->envPath)) {
            return false;
        }

        $env = $this->getEnvContents();

        $env = explode($this->delimiter, $env);

        foreach ($data as $data_key => $data_value) {
            $updated = false;

            foreach ($env as $env_key => $env_value) {
                $entry = explode('=', $env_value, 2);

                // Check if new or old key
                if ($entry[0] == $data_key) {
                    $env[$env_key] = sprintf('%s=%s', $data_key, $this->encode($data_value));
                    $updated = true;
                }
            }

            // Lets create if not available
            if (! $updated) {
                $env[] = $data_key.'='.$this->encode($data_value);
            }
        }

        $env = implode($this->delimiter, $env);

        file_put_contents(base_path('.env'), $env);

        return true;
    }

    /**
     * Encodes value for .env
     *
     * @return mixed|string
     */
    private function encode($str)
    {
        // Convert to string if not already
        $str = (string) $str;

        // If the value is already properly quoted, return as is
        if (strlen($str) >= 2 && $str[0] === '"' && $str[strlen($str) - 1] === '"') {
            return $str;
        }

        // Check if the value contains characters that need quoting
        // Using a character class regex to properly match special characters
        $specialChars = '\^\'£$%&*()}{@#~?><,|=\-_+¬!';
        $needsQuoting = (
            strpos($str, ' ') !== false ||
            preg_match('/['.preg_quote($specialChars, '/').']/', $str)
        );

        if ($needsQuoting) {
            // Escape any existing double quotes in the string
            $str = str_replace('"', '\\"', $str);
            $str = '"'.$str.'"';
        }

        return $str;
    }

    /**
     * Save the database content to the .env file.
     *
     * @return array
     */
    public function saveDatabaseVariables(DatabaseEnvironmentRequest $request)
    {
        $appUrl = $request->get('app_url');
        if ($appUrl !== config('app.url')) {
            config(['app.url' => $appUrl]);
        }
        [$sanctumDomain, $sessionDomain] = $this->getDomains(
            $request->getHttpHost()
        );
        $dbEnv = [
            'APP_URL' => $appUrl,
            'APP_LOCALE' => $request->get('app_locale'),
            'DB_CONNECTION' => $request->get('database_connection'),
            'SESSION_DOMAIN' => $sessionDomain,
        ];
        if ($sanctumDomain !== null) {
            $dbEnv['SANCTUM_STATEFUL_DOMAINS'] = $sanctumDomain;
        }
        if ($dbEnv['DB_CONNECTION'] != 'sqlite') {
            if ($request->has('database_username') && $request->has('database_password')) {
                $dbEnv['DB_HOST'] = $request->get('database_hostname');
                $dbEnv['DB_PORT'] = $request->get('database_port');
                $dbEnv['DB_DATABASE'] = $request->get('database_name');
                $dbEnv['DB_USERNAME'] = $request->get('database_username');
                $dbEnv['DB_PASSWORD'] = $request->get('database_password');
            }
        } else {
            // Laravel 11 requires SQLite at least v3.35.0
            // https://laravel.com/docs/11.x/database#introduction
            if (extension_loaded('sqlite3') && class_exists('\SQLite3') && method_exists('\SQLite3', 'version')) {
                $version = \SQLite3::version();
                if (! empty($version['versionString']) && version_compare($version['versionString'], '3.35.0', '<')) {
                    return [
                        'error_message' => sprintf('The minimum SQLite version is %s. Your current SQLite version is %s which is not supported. Please upgrade SQLite and retry.', '3.35.0', $version['versionString']),
                    ];
                }
            } else {
                return [
                    'error_message' => sprintf('SQLite3 is not present. Please install SQLite >=%s and retry.', '3.35.0'),
                ];
            }
            $dbEnv['DB_DATABASE'] = $request->get('database_name');
            if (! empty($dbEnv['DB_DATABASE'])) {
                $sqlite_path = $dbEnv['DB_DATABASE'];
            } else {
                $sqlite_path = database_path('database.sqlite');
            }
            // Create empty SQLite database if it doesn't exist.
            if (! file_exists($sqlite_path)) {
                copy(database_path('stubs/sqlite.empty.db'), $sqlite_path);
                $dbEnv['DB_DATABASE'] = $sqlite_path;
            }
        }

        try {
            $this->checkDatabaseConnection($request);
            if ($request->get('database_overwrite')) {
                Artisan::call('db:wipe --force');
            }
            if (\Schema::hasTable('users')) {
                return [
                    'error' => 'database_should_be_empty',
                ];
            }
        } catch (Exception $e) {
            return [
                'error_message' => $e->getMessage(),
            ];
        }

        try {
            $this->updateEnv($dbEnv);
        } catch (Exception $e) {
            return [
                'error' => 'database_variables_save_error',
            ];
        }

        return [
            'success' => 'database_variables_save_successfully',
        ];
    }

    /**
     * Returns PDO object if all ok.
     *
     * @return \Closure|\PDO
     */
    private function checkDatabaseConnection(DatabaseEnvironmentRequest $request)
    {
        $connection = $request->get('database_connection');

        $settings = config("database.connections.$connection");

        $connectionArray = array_merge($settings, [
            'driver' => $connection,
            'database' => $request->get('database_name'),
        ]);

        if ($connection !== 'sqlite' && $request->has('database_username') && $request->has('database_password')) {
            $connectionArray = array_merge($connectionArray, [
                'username' => $request->get('database_username'),
                'password' => $request->get('database_password'),
                'host' => $request->get('database_hostname'),
                'port' => $request->get('database_port'),
            ]);
        }

        config([
            'database' => [
                'migrations' => 'migrations',
                'default' => $connection,
                'connections' => [$connection => $connectionArray],
            ],
        ]);

        return DB::connection()->getPdo();
    }

    /**
     * Save the pdf generation content to the .env file.
     *
     * @return array
     */
    public function savePDFVariables(PDFConfigurationRequest $request)
    {
        $pdfEnv = $this->getPDFConfiguration($request);

        try {

            $this->updateEnv($pdfEnv);
        } catch (Exception $e) {
            return [
                'error' => 'pdf_variables_save_error',
            ];
        }

        return [
            'success' => 'pdf_variables_save_successfully',
        ];
    }

    /**
     * Returns the pdf configuration
     *
     * @param  PDFConfigurationRequest  $request
     * @return array
     */
    private function getPDFConfiguration($request)
    {
        $pdfEnv = [];

        $driver = $request->get('pdf_driver');

        switch ($driver) {
            case 'dompdf':
                $pdfEnv = [
                    'PDF_DRIVER' => $request->get('pdf_driver'),
                ];
                break;
            case 'gotenberg':
                $pdfEnv = [
                    'PDF_DRIVER' => $request->get('pdf_driver'),
                    'GOTENBERG_HOST' => $request->get('gotenberg_host'),
                    'GOTENBERG_MARGINS' => $request->get('gotenberg_margins'),
                    'GOTENBERG_PAPERSIZE' => $request->get('gotenberg_papersize'),
                ];
                break;
        }

        return $pdfEnv;
    }

    /**
     * Save sanctum stateful domain to the .env file.
     *
     * @return array
     */
    public function saveDomainVariables(DomainEnvironmentRequest $request)
    {
        try {
            [$sanctumDomain, $sessionDomain] = $this->getDomains(
                $request->get('app_domain')
            );
            $domainEnv = [
                'SESSION_DOMAIN' => $sessionDomain,
            ];
            if ($sanctumDomain !== null) {
                $domainEnv['SANCTUM_STATEFUL_DOMAINS'] = $sanctumDomain;
            }
            $this->updateEnv($domainEnv);
        } catch (Exception $e) {
            return [
                'error' => 'domain_verification_failed',
            ];
        }

        return [
            'success' => 'domain_variable_save_successfully',
        ];
    }

    private function getDomains(string $requestDomain): array
    {
        $appUrl = config('app.url');

        $port = parse_url($appUrl, PHP_URL_PORT);
        $currentDomain = parse_url($appUrl, PHP_URL_HOST).(
            $port ? ':'.$port : ''
        );

        $requestHost = parse_url($requestDomain, PHP_URL_HOST) ?: $requestDomain;

        $isSame = $currentDomain === $requestDomain;

        return [
            $isSame && env('SANCTUM_STATEFUL_DOMAINS', false) === false ?
            null : $requestDomain,
            $isSame && env('SESSION_DOMAIN', false) === null ?
                null : $requestHost,
        ];
    }
}