<?php
/**
 * Admin for LaTeX plugin.
 * 
 * Primary Author: Wizardry and Steamworks <wizardry.steamworks@outlook.com>
 * Original Authors: Mark Lundeberg, Alexander Kraus, Michael Boyle
 * 
 * @license GPL 2
 */

if(!defined('DOKU_INC')) die();
require_once(__DIR__ . '/latexinc.php');

class admin_plugin_latexwas extends DokuWiki_Admin_Plugin {
    protected $output = '';

    /**
     * DokuWiki Admin Menu Position
     */
    public function getMenuSort() {
        return 40;
    }

    /**
     * DOM Generator Helper
     */
    protected function el($tag, $attr = [], $content = '', $selfClosing = false) {
        $html = "<{$tag}";
        foreach ($attr as $k => $v) {
            $html .= " {$k}=\"" . htmlspecialchars($v, ENT_QUOTES, 'UTF-8') . "\"";
        }
        if ($selfClosing) return $html . ' />';
        // Allow content to be an array of elements
        $inner = is_array($content) ? implode('', $content) : $content;
        return $html . ">" . $inner . "</{$tag}>";
    }

    /**
     * Handle form submissions
     */
    public function handle() {
        if (!isset($_POST['latexpurge'])) return;
        
        $mode = $_POST['purgemode'];
        $days = (int)$_POST['purgedays'];
        $timelimit = $days * 86400;

        global $conf;
        $meddir = $conf['mediadir'] . '/' . strtr($this->getConf('latex_namespace'), ':', '/');
        $images = glob($meddir . '/img*');
        $deleted = 0;

        foreach ($images as $img) {
            $age = time() - ($mode === 'atime' ? fileatime($img) : filemtime($img));
            if ($mode === 'all' || $age > $timelimit) {
                if (@unlink($img)) $deleted++;
            }
        }
        
        $this->output = $this->el('div', ['class' => 'success'], "Purge Result: $deleted files deleted from cache.");
        
        // Invalidate DokuWiki cache
        if ($deleted > 0) {
            global $config_cascade;
            @touch($config_cascade['main']['local']);
        }
    }

    /**
     * Generate Admin Interface
     */
    public function html() {
        echo $this->el('h1', [], 'LaTeX Administration');
        echo $this->output;

        // --- SECTION 1: PURGE CACHE ---
        echo $this->el('h2', [], $this->getLang('legend_purge') ?: 'Purge Image Cache');
        
        $purgeForm = $this->el('div', ['class' => 'no'], [
            $this->el('p', [], [
                $this->el('label', [], [
                    $this->el('input', ['type' => 'radio', 'name' => 'purgemode', 'value' => 'atime', 'checked' => 'checked']),
                    ' Access Time '
                ]),
                $this->el('label', [], [
                    $this->el('input', ['type' => 'radio', 'name' => 'purgemode', 'value' => 'all']),
                    ' Delete All '
                ])
            ]),
            $this->el('p', [], [
                'Older than: ',
                $this->el('input', ['type' => 'text', 'name' => 'purgedays', 'value' => '30', 'size' => '3']),
                ' days'
            ]),
            $this->el('input', ['type' => 'submit', 'name' => 'latexpurge', 'class' => 'button', 'value' => $this->getLang('btn_purge') ?: 'Purge Now'])
        ]);
        
        echo $this->el('form', ['method' => 'post', 'action' => wl()], $purgeForm);

        // --- SECTION 2: TROUBLESHOOTER ---
        echo $this->el('h2', [], 'LaTeX Troubleshooter');
        
        $diagForm = $this->el('div', ['class' => 'no'], [
            $this->el('p', [], 'Use this section to test your LaTeX and ImageMagick paths.'),
            $this->el('textarea', [
                'name' => 'testformula', 
                'rows' => '3', 
                'cols' => '60', 
                'style' => 'display:block; margin-bottom:10px;'
            ], '$$\sum_{i=0}^n i^2 = \frac{(n^2+n)(2n+1)}{6}$$'),
            $this->el('input', ['type' => 'submit', 'name' => 'dotest', 'class' => 'button', 'value' => 'Run Diagnostics'])
        ]);

        echo $this->el('form', ['method' => 'get', 'action' => wl()], [
            $this->el('input', ['type' => 'hidden', 'name' => 'do', 'value' => 'admin']),
            $this->el('input', ['type' => 'hidden', 'name' => 'page', 'value' => 'latexwas']),
            $diagForm
        ]);

        if (isset($_REQUEST['dotest'])) {
            $this->runDiagnostics();
        }
    }

    /**
     * System diagnostic logic using DOM Generator
     */
    protected function runDiagnostics() {
        $binaries = [
            'LaTeX'    => $this->getConf("latex_path"),
            'Dvips'    => $this->getConf("dvips_path"),
            'Convert'  => $this->getConf("convert_path"),
            'Identify' => $this->getConf("identify_path")
        ];

        echo $this->el('h3', [], 'Binary Version Check');
        
        $rows = [];
        foreach ($binaries as $name => $path) {
            unset($out);
            exec($path . " --version 2>&1", $out, $status);
            
            $isOk = ($status === 0);
            $msg = $isOk ? ($out[0] ?? 'Found') : 'ERROR: Binary not found or returned error code ' . $status;
            
            $rows[] = $this->el('tr', [], [
                $this->el('td', ['style' => 'font-weight:bold;'], $name),
                $this->el('td', ['style' => 'font-family:monospace; color:' . ($isOk ? 'green' : 'red')], $msg)
            ]);
        }

        echo $this->el('table', ['class' => 'inline'], [
            $this->el('thead', [], $this->el('tr', [], [
                $this->el('th', [], 'Tool'),
                $this->el('th', [], 'Status / Version Output')
            ])),
            $this->el('tbody', [], $rows)
        ]);

        // Rendering Test
        echo $this->el('h3', [], 'Rendering Test');
        $formula = $_REQUEST['testformula'] ?? 'E=mc^2';
        
        // We use a temporary syntax object to trigger a render
        $plug = new syntax_plugin_latexwas_common_proxy(); 
        $url = $plug->_latex->getFormulaURL($formula);

        if ($url) {
            echo $this->el('div', ['class' => 'success'], [
                $this->el('p', [], 'Success! Rendered image:'),
                $this->el('img', ['src' => $url, 'alt' => 'test render', 'style' => 'background:white; padding:10px; border:1px solid #ccc;'])
            ]);
        } else {
            echo $this->el('div', ['class' => 'error'], [
                $this->el('p', [], 'Rendering failed.'),
                $this->el('p', [], 'Error Code: ' . $plug->_latex->_errorcode),
                $this->el('pre', [], $plug->_latex->_cmdoutput)
            ]);
        }
    }
}

/**
 * Proxy class to access the common renderer logic
 */
class syntax_plugin_latexwas_common_proxy extends syntax_plugin_latexwas_common {
    public function getType() { return 'protected'; }
    public function getSort() { return 0; }
    public function connectTo($mode) {}
    public function handle($match, $state, $pos, Doku_Handler $handler) { return []; }
}