<?php

/**
 * Title: WordPress Secure File Editor with Theme.json Support
 * Description: Adds a comprehensive file editor to WordPress admin for editing theme files, plugin files, and text-based media. Includes special support for theme.json editing with syntax validation and a modern interface with security controls.
 * Version: 2.3.0
 * Author: SnipSnip Pro
 * Last Updated: 2025-10-30
 * Blog URL: https://snipsnip.pro/s/922
 * Requirements: WordPress 5.9+, PHP 7.4+
 * License: GPL v2 or later
 * 
 * Changelog:
 * 2.3.0 - Replaced Monokai with Material theme, added configurable theme settings
 * 2.2.0 - Fixed dark mode selection highlight color for better readability
 * 2.1.0 - Dark mode now only affects CodeMirror editor, not the surrounding container
 * 2.0.0 - Added CodeMirror for all file types, Monokai theme for dark mode, dark mode now editor-only
 * 1.9.0 - Fixed file reload issue with CodeMirror not properly destroying previous instance
 * 1.8.0 - Added configurable sidebar section order and custom quick access buttons
 * 1.7.0 - Added dark mode, version display, editor preferences, line numbers toggle
 * 1.6.0 - Fixed file reload issue where same file wouldn't reload after switching files
 * 1.5.0 - Unified notification system, auto-dismiss messages, consistent UX for all feedback
 * 1.4.0 - Fixed validation result button sizing issue
 * 1.3.0 - Fixed HTML rendering bug, renamed class to remove theme.json specificity, improved UI
 * 1.2.0 - Fixed manual path input bug, improved UI clarity, removed confusing browse section
 * 1.1.0 - Fixed editor height, added manual file path input, added quick access to common files
 * 1.0.0 - Initial release with theme.json editor, file browser, and security features
 */

if (!class_exists('WP_Secure_Admin_File_Editor')):

class WP_Secure_Admin_File_Editor {
    
    const VERSION = '2.3.0';
    
    private $capability_required = 'edit_themes';
    private $allowed_extensions = ['php', 'css', 'js', 'json', 'txt', 'html', 'xml', 'md', 'svg'];
    private $base_paths = [];
    
    /**
     * Sidebar section order configuration
     * Valid sections: 'quick_access', 'manual_path', 'settings'
     * Reorder this array to change sidebar layout
     */
    private $sidebar_sections = ['quick_access', 'manual_path', 'settings'];
    
    /**
     * Custom quick access links
     * Add custom links here - format: ['label' => 'File Label', 'path' => 'themes/theme-name/file.ext', 'icon' => '📄']
     */
    private $custom_quick_links = [
        // Example: ['label' => 'Custom Config', 'path' => 'plugins/my-plugin/config.json', 'icon' => '⚙️']
    ];
    
    /**
     * Editor theme configuration
     * Dark theme options: 'material', 'dracula', 'tomorrow-night', 'base16-dark'
     * Light theme: 'default'
     */
    private $dark_theme = 'material';
    private $light_theme = 'default';
    
    public function __construct() {
        // Set up allowed base paths
        $this->base_paths = [
            'themes' => get_theme_root(),
            'plugins' => WP_PLUGIN_DIR,
            'uploads' => wp_upload_dir()['basedir']
        ];
        
        add_action('admin_menu', [$this, 'add_admin_menu']);
        add_action('admin_enqueue_scripts', [$this, 'enqueue_assets']);
        add_action('wp_ajax_sfe_load_file', [$this, 'ajax_load_file']);
        add_action('wp_ajax_sfe_save_file', [$this, 'ajax_save_file']);
        add_action('wp_ajax_sfe_browse_files', [$this, 'ajax_browse_files']);
    }
    
    /**
     * Add admin menu item
     */
    public function add_admin_menu() {
        add_management_page(
            'File Editor',
            'File Editor',
            $this->capability_required,
            'secure-file-editor',
            [$this, 'render_editor_page']
        );
    }
    
    /**
     * Enqueue CSS and JavaScript
     */
    public function enqueue_assets($hook) {
        if ('tools_page_secure-file-editor' !== $hook) {
            return;
        }
        
        wp_enqueue_code_editor(['type' => 'application/json']);
        wp_enqueue_script('jquery');
        
        $this->add_inline_styles();
        $this->add_inline_scripts();
    }
    
    /**
     * Add inline CSS
     */
    private function add_inline_styles() {
        $css = <<<'STYLES'
.sfe-container {
    display: flex;
    gap: 20px;
    margin: 20px 0;
    height: calc(100vh - 200px);
}
.sfe-version {
    display: inline-block;
    margin-left: 10px;
    padding: 2px 8px;
    background: #f0f0f1;
    border-radius: 3px;
    font-size: 11px;
    color: #646970;
    font-weight: normal;
}
.sfe-sidebar {
    flex: 0 0 300px;
    background: #fff;
    border: 1px solid #ccd0d4;
    padding: 15px;
    overflow-y: auto;
}
.sfe-settings {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #ccd0d4;
}
.sfe-quick-access {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #ccd0d4;
}
.sfe-manual-path-section {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #ccd0d4;
}
.sfe-settings h4,
.sfe-quick-access h4,
.sfe-manual-path-section h4 {
    margin: 0 0 10px 0;
    font-size: 13px;
    text-transform: uppercase;
    color: #646970;
}
.sfe-setting-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 0;
    font-size: 13px;
}
.sfe-setting-row label {
    cursor: pointer;
}
.sfe-toggle {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 20px;
}
.sfe-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}
.sfe-toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .3s;
    border-radius: 20px;
}
.sfe-toggle-slider:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s;
    border-radius: 50%;
}
.sfe-toggle input:checked + .sfe-toggle-slider {
    background-color: #2271b1;
}
.sfe-toggle input:checked + .sfe-toggle-slider:before {
    transform: translateX(20px);
}
.cm-s-material.CodeMirror {
    background: #263238;
    color: #eeffff;
}
.cm-s-material .CodeMirror-gutters {
    background: #263238;
    border-right: 1px solid #37474f;
}
.cm-s-material .CodeMirror-linenumber {
    color: #546e7a;
}
.cm-s-material .CodeMirror-cursor {
    border-left: 1px solid #ffcc00;
}
.cm-s-material span.cm-comment {
    color: #546e7a;
}
.cm-s-material span.cm-atom {
    color: #f07178;
}
.cm-s-material span.cm-number {
    color: #f78c6c;
}
.cm-s-material span.cm-property {
    color: #82aaff;
}
.cm-s-material span.cm-attribute {
    color: #ffcb6b;
}
.cm-s-material span.cm-keyword {
    color: #c792ea;
}
.cm-s-material span.cm-string {
    color: #c3e88d;
}
.cm-s-material span.cm-variable {
    color: #eeffff;
}
.cm-s-material span.cm-variable-2 {
    color: #82aaff;
}
.cm-s-material span.cm-def {
    color: #82aaff;
}
.cm-s-material span.cm-bracket {
    color: #eeffff;
}
.cm-s-material span.cm-tag {
    color: #f07178;
}
.cm-s-material span.cm-link {
    color: #82aaff;
}
.cm-s-material span.cm-error {
    background: #ff5370;
    color: #fff;
}
.cm-s-material .CodeMirror-selected {
    background: #314549;
}
.cm-s-material .CodeMirror-line::selection,
.cm-s-material .CodeMirror-line > span::selection,
.cm-s-material .CodeMirror-line > span > span::selection {
    background: #314549;
}
.cm-s-material .CodeMirror-line::-moz-selection,
.cm-s-material .CodeMirror-line > span::-moz-selection,
.cm-s-material .CodeMirror-line > span > span::-moz-selection {
    background: #314549;
}
.sfe-editor-area {
    flex: 1;
    background: #fff;
    border: 1px solid #ccd0d4;
    padding: 20px;
    display: flex;
    flex-direction: column;
}
.sfe-file-tree {
    list-style: none;
    padding: 0;
    margin: 0;
}
.sfe-file-tree li {
    padding: 5px 0;
    cursor: pointer;
    user-select: none;
}
.sfe-file-tree li:hover {
    background: #f0f0f1;
}
.sfe-folder {
    font-weight: 600;
    color: #2271b1;
}
.sfe-file {
    padding-left: 20px;
    color: #50575e;
}
.sfe-file.active {
    background: #2271b1;
    color: #fff;
}
.sfe-editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid #ccd0d4;
}
.sfe-file-info {
    font-size: 14px;
    color: #50575e;
}
.sfe-editor-actions {
    display: flex;
    gap: 10px;
}
.sfe-editor-content {
    flex: 1;
    position: relative;
    min-height: 400px;
    display: flex;
    flex-direction: column;
}
.sfe-editor-content textarea {
    width: 100%;
    flex: 1;
    min-height: 100%;
    font-family: 'Courier New', monospace;
    font-size: 13px;
    border: 1px solid #ccd0d4;
    padding: 10px;
    resize: none;
    box-sizing: border-box;
}
.sfe-editor-content .CodeMirror {
    height: 100%;
    min-height: 400px;
    border: 1px solid #ccd0d4;
}
.sfe-notice {
    margin: 15px 0;
    padding: 12px;
    border-left: 4px solid #00a32a;
    background: #fff;
    box-shadow: 0 1px 1px rgba(0,0,0,0.04);
}
.sfe-notice.error {
    border-left-color: #d63638;
}
.sfe-notice.warning {
    border-left-color: #dba617;
}
.sfe-quick-access {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #ccd0d4;
}
.sfe-quick-access h4 {
    margin: 0 0 10px 0;
    font-size: 13px;
    text-transform: uppercase;
    color: #646970;
}
.sfe-file-path-input {
    display: flex;
    gap: 5px;
    margin-bottom: 15px;
}
.sfe-file-path-input input {
    flex: 1;
    padding: 6px 10px;
    border: 1px solid #8c8f94;
    border-radius: 3px;
    font-size: 13px;
}
.sfe-file-path-input button {
    padding: 6px 12px;
    background: #2271b1;
    color: #fff;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    font-size: 13px;
}
.sfe-file-path-input button:hover {
    background: #135e96;
}
.sfe-quick-link {
    display: block;
    padding: 8px 10px;
    margin: 5px 0;
    background: #f6f7f7;
    border: 1px solid #dcdcde;
    border-radius: 3px;
    text-decoration: none;
    color: #2271b1;
    transition: all 0.2s;
}
.sfe-quick-link:hover {
    background: #2271b1;
    color: #fff;
    border-color: #2271b1;
}
.sfe-toast {
    position: fixed;
    top: 32px;
    right: 20px;
    min-width: 300px;
    max-width: 500px;
    padding: 12px 16px;
    background: #fff;
    border-left: 4px solid #00a32a;
    box-shadow: 0 3px 8px rgba(0,0,0,0.15);
    border-radius: 3px;
    font-size: 13px;
    z-index: 999999;
    animation: slideIn 0.3s ease-out;
    display: flex;
    align-items: center;
    gap: 10px;
}
.sfe-toast.error {
    border-left-color: #d63638;
}
.sfe-toast.warning {
    border-left-color: #dba617;
}
.sfe-toast.info {
    border-left-color: #2271b1;
}
.sfe-toast-close {
    margin-left: auto;
    cursor: pointer;
    color: #646970;
    font-size: 16px;
    line-height: 1;
    padding: 0 4px;
}
.sfe-toast-close:hover {
    color: #000;
}
@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}
.sfe-editor-actions {
    position: relative;
}
STYLES;
        wp_add_inline_style('wp-admin', $css);
    }
    
    /**
     * Add inline JavaScript
     */
    private function add_inline_scripts() {
        $js = <<<'JAVASCRIPT'
window.addEventListener("load", function() {
    (function createSecureFileEditorScope() {
        "use strict";
        
        let currentFile = null;
        let currentEditor = null;
        let isDirty = false;
        
        function init() {
            loadSettings();
            setupEventListeners();
            loadQuickAccessFiles();
        }
        
        function loadSettings() {
            const darkMode = localStorage.getItem('sfe_dark_mode') === 'true';
            const lineNumbers = localStorage.getItem('sfe_line_numbers') !== 'false';
            const wordWrap = localStorage.getItem('sfe_word_wrap') !== 'false';
            
            document.getElementById('sfe-dark-mode').checked = darkMode;
            document.getElementById('sfe-line-numbers').checked = lineNumbers;
            document.getElementById('sfe-word-wrap').checked = wordWrap;
        }
        
        function setupEventListeners() {
            const saveButton = document.getElementById('sfe-save-button');
            const validateButton = document.getElementById('sfe-validate-button');
            const loadManualButton = document.getElementById('sfe-load-manual');
            const manualPathInput = document.getElementById('sfe-manual-path');
            
            const darkModeToggle = document.getElementById('sfe-dark-mode');
            const lineNumbersToggle = document.getElementById('sfe-line-numbers');
            const wordWrapToggle = document.getElementById('sfe-word-wrap');
            
            if (saveButton) {
                saveButton.addEventListener('click', saveFile);
            }
            
            if (validateButton) {
                validateButton.addEventListener('click', validateJSON);
            }
            
            if (loadManualButton) {
                loadManualButton.addEventListener('click', function() {
                    const filePath = manualPathInput.value.trim();
                    if (filePath) {
                        loadFile(filePath);
                    } else {
                        showToast('Please enter a file path', 'error');
                    }
                });
            }
            
            if (manualPathInput) {
                manualPathInput.addEventListener('keypress', function(e) {
                    if (e.key === 'Enter') {
                        const filePath = this.value.trim();
                        if (filePath) {
                            loadFile(filePath);
                        }
                    }
                });
            }
            
            if (darkModeToggle) {
                darkModeToggle.addEventListener('change', function() {
                    localStorage.setItem('sfe_dark_mode', this.checked);
                    if (currentEditor) {
                        currentEditor.codemirror.setOption('theme', this.checked ? 'material' : 'default');
                    }
                });
            }
            
            if (lineNumbersToggle) {
                lineNumbersToggle.addEventListener('change', function() {
                    localStorage.setItem('sfe_line_numbers', this.checked);
                    if (currentEditor) {
                        currentEditor.codemirror.setOption('lineNumbers', this.checked);
                    }
                });
            }
            
            if (wordWrapToggle) {
                wordWrapToggle.addEventListener('change', function() {
                    localStorage.setItem('sfe_word_wrap', this.checked);
                    if (currentEditor) {
                        currentEditor.codemirror.setOption('lineWrapping', this.checked);
                    }
                });
            }
            
            window.addEventListener('beforeunload', function(e) {
                if (isDirty) {
                    e.preventDefault();
                    e.returnValue = '';
                }
            });
            
            const editorTextarea = document.getElementById('sfe-editor-textarea');
            if (editorTextarea) {
                editorTextarea.addEventListener('input', function() {
                    isDirty = true;
                });
            }
        }
        
        function loadQuickAccessFiles() {
            const quickLinks = document.querySelectorAll('[data-file-path]');
            quickLinks.forEach(function(link) {
                link.addEventListener('click', function(e) {
                    e.preventDefault();
                    const filePath = this.getAttribute('data-file-path');
                    loadFile(filePath);
                });
            });
        }
        
        function loadFile(filePath) {
            // Warn if unsaved changes
            if (isDirty && currentFile && currentFile !== filePath) {
                if (!confirm('You have unsaved changes. Continue loading new file?')) {
                    return;
                }
            }
            
            showToast('Loading file...', 'info', 2000);
            
            jQuery.ajax({
                url: ajaxurl,
                type: 'POST',
                data: {
                    action: 'sfe_load_file',
                    nonce: sfeData.nonce,
                    file: filePath
                },
                success: function(response) {
                    if (response.success) {
                        currentFile = filePath;
                        displayFile(response.data);
                        isDirty = false;
                    } else {
                        showToast(response.data.message, 'error');
                    }
                },
                error: function() {
                    showToast('Failed to load file', 'error');
                }
            });
        }
        
        function displayFile(data) {
            const fileInfo = document.getElementById('sfe-file-info');
            const editorTextarea = document.getElementById('sfe-editor-textarea');
            const validateButton = document.getElementById('sfe-validate-button');
            
            const lineNumbers = document.getElementById('sfe-line-numbers').checked;
            const wordWrap = document.getElementById('sfe-word-wrap').checked;
            const darkMode = document.getElementById('sfe-dark-mode').checked;
            
            if (fileInfo) {
                fileInfo.textContent = data.file;
            }
            
            if (editorTextarea) {
                // Always destroy existing CodeMirror instance first
                if (currentEditor) {
                    currentEditor.codemirror.toTextArea();
                    currentEditor = null;
                }
                
                // Reset textarea
                editorTextarea.style.display = '';
                editorTextarea.disabled = false;
                editorTextarea.value = data.content;
                
                // Determine mode based on file extension
                let mode = 'text/plain';
                if (data.file.endsWith('.json')) {
                    mode = 'application/json';
                } else if (data.file.endsWith('.css')) {
                    mode = 'css';
                } else if (data.file.endsWith('.js')) {
                    mode = 'javascript';
                } else if (data.file.endsWith('.php')) {
                    mode = 'php';
                } else if (data.file.endsWith('.html')) {
                    mode = 'htmlmixed';
                } else if (data.file.endsWith('.xml')) {
                    mode = 'xml';
                } else if (data.file.endsWith('.md')) {
                    mode = 'markdown';
                }
                
                // Initialize CodeMirror for all files if available
                if (typeof wp.codeEditor !== 'undefined') {
                    currentEditor = wp.codeEditor.initialize(editorTextarea, {
                        codemirror: {
                            mode: mode,
                            lineNumbers: lineNumbers,
                            lineWrapping: wordWrap,
                            theme: darkMode ? 'material' : 'default'
                        }
                    });
                    
                    currentEditor.codemirror.on('change', function() {
                        isDirty = true;
                    });
                }
                
                if (validateButton) {
                    validateButton.style.display = data.file.endsWith('.json') ? 'inline-block' : 'none';
                }
            }
        }
        
        function saveFile() {
            if (!currentFile) {
                showToast('No file loaded', 'error');
                return;
            }
            
            let content;
            if (currentEditor) {
                content = currentEditor.codemirror.getValue();
            } else {
                content = document.getElementById('sfe-editor-textarea').value;
            }
            
            showToast('Saving file...', 'info', 2000);
            
            jQuery.ajax({
                url: ajaxurl,
                type: 'POST',
                data: {
                    action: 'sfe_save_file',
                    nonce: sfeData.nonce,
                    file: currentFile,
                    content: content
                },
                success: function(response) {
                    if (response.success) {
                        showToast('✓ File saved successfully!', 'success', 3000);
                        isDirty = false;
                    } else {
                        showToast(response.data.message, 'error');
                    }
                },
                error: function() {
                    showToast('Failed to save file', 'error');
                }
            });
        }
        
        function validateJSON() {
            let content;
            if (currentEditor) {
                content = currentEditor.codemirror.getValue();
            } else {
                content = document.getElementById('sfe-editor-textarea').value;
            }
            
            try {
                JSON.parse(content);
                showToast('✓ Valid JSON', 'success');
            } catch (e) {
                showToast('✗ Invalid JSON: ' + e.message, 'error');
            }
        }
        
        function showToast(message, type, duration) {
            duration = duration || 4000;
            
            const existingToast = document.querySelector('.sfe-toast');
            if (existingToast) {
                existingToast.remove();
            }
            
            const toast = document.createElement('div');
            toast.className = 'sfe-toast ' + (type || 'info');
            
            const messageSpan = document.createElement('span');
            messageSpan.textContent = message;
            
            const closeBtn = document.createElement('span');
            closeBtn.className = 'sfe-toast-close';
            closeBtn.innerHTML = '×';
            closeBtn.onclick = function() {
                toast.remove();
            };
            
            toast.appendChild(messageSpan);
            toast.appendChild(closeBtn);
            document.body.appendChild(toast);
            
            setTimeout(function() {
                if (toast.parentNode) {
                    toast.remove();
                }
            }, duration);
        }
        
        init();
    })();
});
JAVASCRIPT;
        wp_add_inline_script('jquery', $js);
        
        wp_localize_script('jquery', 'sfeData', [
            'nonce' => wp_create_nonce('sfe_editor_nonce'),
            'ajaxurl' => admin_url('admin-ajax.php')
        ]);
    }
    
    /**
     * Get default quick access links
     */
    private function get_default_quick_links() {
        $links = [];
        $theme = wp_get_theme();
        
        // Theme.json
        if (file_exists(get_stylesheet_directory() . '/theme.json')) {
            $links[] = [
                'label' => 'theme.json',
                'path' => 'themes/' . $theme->get_stylesheet() . '/theme.json',
                'icon' => '📄'
            ];
        }
        
        // Functions.php
        if (file_exists(get_stylesheet_directory() . '/functions.php')) {
            $links[] = [
                'label' => 'functions.php',
                'path' => 'themes/' . $theme->get_stylesheet() . '/functions.php',
                'icon' => '⚙️'
            ];
        }
        
        // Style.css
        if (file_exists(get_stylesheet_directory() . '/style.css')) {
            $links[] = [
                'label' => 'style.css',
                'path' => 'themes/' . $theme->get_stylesheet() . '/style.css',
                'icon' => '🎨'
            ];
        }
        
        return $links;
    }
    
    /**
     * Render quick access section
     */
    private function render_quick_access() {
        $default_links = $this->get_default_quick_links();
        $all_links = array_merge($default_links, $this->custom_quick_links);
        
        if (empty($all_links)) {
            return;
        }
        
        ?>
        <div class="sfe-quick-access">
            <h4>Quick Access</h4>
            <?php foreach ($all_links as $link): ?>
                <a href="#" class="sfe-quick-link" data-file-path="<?php echo esc_attr($link['path']); ?>">
                    <?php echo esc_html($link['icon']); ?> <?php echo esc_html($link['label']); ?>
                </a>
            <?php endforeach; ?>
        </div>
        <?php
    }
    
    /**
     * Render manual path section
     */
    private function render_manual_path() {
        ?>
        <div class="sfe-manual-path-section">
            <h4>Manual File Path</h4>
            <div class="sfe-file-path-input">
                <input type="text" id="sfe-manual-path" placeholder="e.g., themes/twentytwentyfour/theme.json" />
                <button type="button" id="sfe-load-manual">Load</button>
            </div>
            <p style="font-size: 12px; color: #646970; margin-top: 5px;">
                Enter path format: <code>themes/your-theme/file.php</code><br>
                or <code>plugins/plugin-name/config.json</code>
            </p>
        </div>
        <?php
    }
    
    /**
     * Render settings section
     */
    private function render_settings() {
        ?>
        <div class="sfe-settings">
            <h4>Editor Settings</h4>
            <div class="sfe-setting-row">
                <label for="sfe-dark-mode">Dark Mode</label>
                <label class="sfe-toggle">
                    <input type="checkbox" id="sfe-dark-mode">
                    <span class="sfe-toggle-slider"></span>
                </label>
            </div>
            <div class="sfe-setting-row">
                <label for="sfe-line-numbers">Line Numbers</label>
                <label class="sfe-toggle">
                    <input type="checkbox" id="sfe-line-numbers" checked>
                    <span class="sfe-toggle-slider"></span>
                </label>
            </div>
            <div class="sfe-setting-row">
                <label for="sfe-word-wrap">Word Wrap</label>
                <label class="sfe-toggle">
                    <input type="checkbox" id="sfe-word-wrap" checked>
                    <span class="sfe-toggle-slider"></span>
                </label>
            </div>
        </div>
        <?php
    }
    
    /**
     * Render the editor page
     */
    public function render_editor_page() {
        if (!current_user_can($this->capability_required)) {
            wp_die(__('You do not have sufficient permissions to access this page.'));
        }
        
        ?>
        <div class="wrap">
            <h1>
                Secure File Editor
                <span class="sfe-version">v<?php echo esc_html(self::VERSION); ?></span>
            </h1>
            <p>Edit theme files, plugin files, and text-based content with a modern interface and security controls.</p>
            
            <div class="sfe-container">
                <div class="sfe-sidebar">
                    <?php
                    // Render sidebar sections in configured order
                    foreach ($this->sidebar_sections as $section) {
                        switch ($section) {
                            case 'quick_access':
                                $this->render_quick_access();
                                break;
                            case 'manual_path':
                                $this->render_manual_path();
                                break;
                            case 'settings':
                                $this->render_settings();
                                break;
                        }
                    }
                    ?>
                </div>
                
                <div class="sfe-editor-area">
                    <div class="sfe-editor-header">
                        <div class="sfe-file-info" id="sfe-file-info">No file loaded</div>
                        <div class="sfe-editor-actions">
                            <button type="button" class="button button-primary" id="sfe-save-button">Save Changes</button>
                            <button type="button" class="button" id="sfe-validate-button" style="display: none;">Validate JSON</button>
                        </div>
                    </div>
                    
                    <div class="sfe-editor-content">
                        <textarea id="sfe-editor-textarea" placeholder="Load a file to begin editing..."></textarea>
                    </div>
                </div>
            </div>
            
            <div style="margin-top: 20px; padding: 15px; background: #fff3cd; border-left: 4px solid #ffc107;">
                <strong>⚠️ Security Warning:</strong> Only authorized administrators should use this tool. Always backup files before editing. Invalid code can break your site.
            </div>
        </div>
        <?php
    }
    
    /**
     * AJAX: Load file content
     */
    public function ajax_load_file() {
        check_ajax_referer('sfe_editor_nonce', 'nonce');
        
        if (!current_user_can($this->capability_required)) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        $file = sanitize_text_field($_POST['file']);
        $real_path = $this->validate_file_path($file);
        
        if (!$real_path) {
            wp_send_json_error(['message' => 'Invalid file path']);
        }
        
        if (!file_exists($real_path)) {
            wp_send_json_error(['message' => 'File does not exist']);
        }
        
        if (!is_readable($real_path)) {
            wp_send_json_error(['message' => 'File is not readable']);
        }
        
        $content = file_get_contents($real_path);
        
        if ($content === false) {
            wp_send_json_error(['message' => 'Failed to read file']);
        }
        
        wp_send_json_success([
            'file' => $file,
            'content' => $content,
            'size' => filesize($real_path),
            'modified' => date('Y-m-d H:i:s', filemtime($real_path))
        ]);
    }
    
    /**
     * AJAX: Save file content
     */
    public function ajax_save_file() {
        check_ajax_referer('sfe_editor_nonce', 'nonce');
        
        if (!current_user_can($this->capability_required)) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        $file = sanitize_text_field($_POST['file']);
        $content = wp_unslash($_POST['content']);
        
        $real_path = $this->validate_file_path($file);
        
        if (!$real_path) {
            wp_send_json_error(['message' => 'Invalid file path']);
        }
        
        if (!file_exists($real_path)) {
            wp_send_json_error(['message' => 'File does not exist']);
        }
        
        if (!is_writable($real_path)) {
            wp_send_json_error(['message' => 'File is not writable']);
        }
        
        // Validate JSON files
        if (pathinfo($real_path, PATHINFO_EXTENSION) === 'json') {
            json_decode($content);
            if (json_last_error() !== JSON_ERROR_NONE) {
                wp_send_json_error(['message' => 'Invalid JSON: ' . json_last_error_msg()]);
            }
        }
        
        // Create backup
        $backup_path = $real_path . '.backup-' . date('Y-m-d-His');
        copy($real_path, $backup_path);
        
        $result = file_put_contents($real_path, $content);
        
        if ($result === false) {
            wp_send_json_error(['message' => 'Failed to save file']);
        }
        
        wp_send_json_success([
            'message' => 'File saved successfully',
            'backup' => basename($backup_path)
        ]);
    }
    
    /**
     * AJAX: Browse files
     */
    public function ajax_browse_files() {
        check_ajax_referer('sfe_editor_nonce', 'nonce');
        
        if (!current_user_can($this->capability_required)) {
            wp_send_json_error(['message' => 'Insufficient permissions']);
        }
        
        $path = sanitize_text_field($_POST['path']);
        $real_path = $this->validate_file_path($path);
        
        if (!$real_path || !is_dir($real_path)) {
            wp_send_json_error(['message' => 'Invalid directory']);
        }
        
        $files = scandir($real_path);
        $items = [];
        
        foreach ($files as $file) {
            if ($file === '.' || $file === '..') {
                continue;
            }
            
            $full_path = $real_path . '/' . $file;
            $items[] = [
                'name' => $file,
                'type' => is_dir($full_path) ? 'dir' : 'file',
                'path' => $path . '/' . $file
            ];
        }
        
        wp_send_json_success($items);
    }
    
    /**
     * Validate and resolve file path
     */
    private function validate_file_path($file) {
        // Parse the path
        $parts = explode('/', trim($file, '/'));
        
        if (count($parts) < 2) {
            return false;
        }
        
        $base_type = array_shift($parts);
        
        if (!isset($this->base_paths[$base_type])) {
            return false;
        }
        
        $base_path = $this->base_paths[$base_type];
        $real_path = realpath($base_path . '/' . implode('/', $parts));
        
        if (!$real_path || strpos($real_path, $base_path) !== 0) {
            return false;
        }
        
        $extension = pathinfo($real_path, PATHINFO_EXTENSION);
        if (!in_array($extension, $this->allowed_extensions)) {
            return false;
        }
        
        return $real_path;
    }
}

endif;

if (class_exists('WP_Secure_Admin_File_Editor')):
    new WP_Secure_Admin_File_Editor();
endif;