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<?php

namespace Laravel\Envoy;

use Illuminate\Support\Str;

class SSHConfigFile
{
    /**
     * The SSH configuration groups.
     *
     * @var array
     */
    protected $groups = [];

    /**
     * Create a new SSH configuration file.
     *
     * @param  array  $groups
     * @return void
     */
    public function __construct(array $groups)
    {
        $this->groups = $groups;
    }

    /**
     * Parse the given configuration file.
     *
     * @param  string  $file
     * @return \Laravel\Envoy\SSHConfigFile
     */
    public static function parse($file)
    {
        return static::parseString(file_get_contents($file));
    }

    /**
     * Parse the given configuration string.
     *
     * @param  string  $string
     * @return \Laravel\Envoy\SSHConfigFile
     */
    public static function parseString($string)
    {
        $groups = [];

        $index = 0;

        $matchSection = false;

        foreach (explode(PHP_EOL, $string) as $line) {
            $line = trim($line);

            if ('' == $line || Str::startsWith($line, '#')) {
                continue;
            }

            // Keys and values may get separated via an equals, so we'll parse them both
            // out here and hang onto their values. We will also lower case this keys
            // and unquotes the values so they are properly formatted for next use.
            if (preg_match('/^\s*(\S+)\s*=(.*)$/', $line, $match)) {
                $key = strtolower($match[1]);

                $value = self::unquote($match[2]);
            }

            // Keys and values may also get separated via a space, so we will parse them
            // out here and hang onto their values. We will also lower case this keys
            // and unquotes the values so they are properly formatted for next use.
            else {
                $segments = preg_split('/\s+/', $line, 2);

                $key = strtolower($segments[0]);

                $value = self::unquote($segments[1]);
            }

            // The configuration file contains sections separated by Host and / or Match
            // specifications. Therefore, if we come across a Host keyword we start a
            // new group. If it's a Match we ignore declarations until next 'Host'.
            if ('host' === $key) {
                $index++;

                $matchSection = false;
            } elseif ('match' === $key) {
                $matchSection = true;
            }

            if (! $matchSection) {
                $groups[$index][$key] = $value;
            }
        }

        return new self(array_values($groups));
    }

    /**
     * Get the configured SSH host by name or IP.
     *
     * @param  string  $host
     * @return string|null
     */
    public function findConfiguredHost($host)
    {
        [$user, $host] = $this->parseHost($host);

        foreach ($this->groups as $group) {
            if ((isset($group['host']) && $group['host'] == $host) ||
                (isset($group['hostname']) && $group['hostname'] == $host)) {
                if (! empty($user)) {
                    // User is not specified in the SSH configuration...
                    if (! isset($group['user'])) {
                        continue;
                    }

                    // User is specified in the SSH configuration but is not the given user....
                    if (isset($group['user']) && $group['user'] != $user) {
                        continue;
                    }
                }

                return preg_replace('/\s+.*$/', '', $group['host']);
            }
        }
    }

    /**
     * Parse the host into user and host segments.
     *
     * @param  string  $host
     * @return array
     */
    protected function parseHost($host)
    {
        return Str::contains($host, '@') ? explode('@', $host) : [null, $host];
    }

    /**
     * Unquote an optionally double quoted string.
     *
     * @param  string  $string
     * @return string
     */
    private static function unquote($string)
    {
        if ('"' === substr($string, 0, 1) && '"' === substr($string, -1, 1)) {
            return substr($string, 1, -1);
        }

        return $string;
    }
}