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<?php

namespace App\Http\Middleware;

use Closure;

class MinifyHtml
{
    /**
     * Handle an incoming request.
     *
     * @param \Illuminate\Http\Request $request
     * @param \Closure                 $next
     *
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $response = $next($request);

        return $this->html($response);
    }

    public function html($response)
    {
        $buffer = $response->getContent();

        $replace = [
            '/<!--[^\[](.*?)[^\]]-->/s' => '',
            "/<\?php/"                  => '<?php ',
            "/\n([\S])/"                => '$1',
            "/\r/"                      => '',
            "/\n/"                      => '',
            "/\t/"                      => '',
            '/ +/'                      => ' ',
        ];

        if (false !== strpos($buffer, '<pre>')) {
            $replace = [
                '/<!--[^\[](.*?)[^\]]-->/s' => '',
                "/<\?php/"                  => '<?php ',
                "/\r/"                      => '',
                "/>\n</"                    => '><',
                "/>\s+\n</"                 => '><',
                "/>\n\s+</"                 => '><',
            ];
        }

        $buffer = preg_replace(array_keys($replace), array_values($replace), $buffer);

        $response->setContent($buffer);

        return $response;
    }
}