<?php
/**
 * Plugin Name: Category Sync — Exporter (OLD SITE)
 * Description: Exposes a secure REST API endpoint so the new site can pull categories + post assignments. Install on OLD site only.
 * Version: 1.0
 * Author: Migration Tool
 */

if (!defined('ABSPATH')) exit;

class CategorySyncExporter {

    private $option_key = 'cat_sync_secret_key';

    public function __construct() {
        add_action('rest_api_init', [$this, 'register_routes']);
        add_action('admin_menu',    [$this, 'add_menu']);
        add_action('admin_init',    [$this, 'handle_key_generation']);
        add_action('admin_enqueue_scripts', [$this, 'enqueue_styles']);
    }

    public function enqueue_styles($hook) {
        if ($hook !== 'toplevel_page_cat-sync-exporter') return;
        wp_enqueue_style('google-fonts-exporter', 'https://fonts.googleapis.com/css2?family=Syne:wght@400;700;800&family=DM+Mono:wght@400;500&display=swap', [], null);
    }

    public function add_menu() {
        add_menu_page(
            'Category Sync Exporter',
            '📤 Cat Sync Exporter',
            'manage_options',
            'cat-sync-exporter',
            [$this, 'render_page'],
            'dashicons-database-export',
            80
        );
    }

    public function handle_key_generation() {
        if (isset($_POST['cat_sync_generate_key']) && check_admin_referer('cat_sync_generate')) {
            $key = 'cse_' . bin2hex(random_bytes(24));
            update_option($this->option_key, $key);
            add_action('admin_notices', function() {
                echo '<div class="notice notice-success"><p>New secret key generated!</p></div>';
            });
        }
    }

    public function register_routes() {
        register_rest_route('cat-sync/v1', '/export', [
            'methods'             => 'GET',
            'callback'            => [$this, 'export_data'],
            'permission_callback' => [$this, 'verify_key'],
        ]);
    }

    public function verify_key($request) {
        $stored_key = get_option($this->option_key, '');
        $provided   = $request->get_header('X-Cat-Sync-Key') ?: $request->get_param('key');
        return !empty($stored_key) && hash_equals($stored_key, (string) $provided);
    }

    public function export_data() {
        $categories = get_terms([
            'taxonomy'   => 'category',
            'hide_empty' => false,
        ]);

        $cat_data = [];
        foreach ($categories as $cat) {
            $cat_data[] = [
                'term_id'     => $cat->term_id,
                'name'        => $cat->name,
                'slug'        => $cat->slug,
                'description' => $cat->description,
                'count'       => $cat->count,
            ];
        }

        // Get all posts with their categories
        $posts = get_posts([
            'numberposts' => -1,
            'post_status' => ['publish', 'draft', 'private'],
            'fields'      => 'ids',
        ]);

        $post_category_map = [];
        foreach ($posts as $post_id) {
            $post_cats = wp_get_post_categories($post_id, ['fields' => 'slugs']);
            if (!empty($post_cats)) {
                $post_title = get_the_title($post_id);
                $post_slug  = get_post_field('post_name', $post_id);
                $post_category_map[] = [
                    'post_id'    => $post_id,
                    'post_title' => $post_title,
                    'post_slug'  => $post_slug,
                    'categories' => $post_cats,
                ];
            }
        }

        return rest_ensure_response([
            'success'           => true,
            'site_url'          => get_site_url(),
            'exported_at'       => current_time('mysql'),
            'categories'        => $cat_data,
            'post_category_map' => $post_category_map,
            'totals'            => [
                'categories' => count($cat_data),
                'posts'      => count($post_category_map),
            ],
        ]);
    }

    public function render_page() {
        $secret_key = get_option($this->option_key, '');
        $api_url    = get_rest_url(null, 'cat-sync/v1/export');
        ?>
        <style>
        * { box-sizing: border-box; margin: 0; padding: 0; }
        #cat-sync-exporter-wrap {
            font-family: 'Syne', sans-serif;
            background: #0a0a0f;
            min-height: 100vh;
            padding: 40px;
            color: #e8e8f0;
        }
        .cse-header {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-bottom: 40px;
        }
        .cse-badge {
            background: linear-gradient(135deg, #ff6b35, #f7c59f);
            color: #0a0a0f;
            font-size: 11px;
            font-weight: 700;
            letter-spacing: 2px;
            text-transform: uppercase;
            padding: 4px 12px;
            border-radius: 20px;
        }
        .cse-header h1 {
            font-size: 32px;
            font-weight: 800;
            background: linear-gradient(90deg, #ff6b35, #f7c59f);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .cse-subtitle { color: #666; font-size: 14px; margin-top: 4px; font-family: 'DM Mono', monospace; }

        .cse-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; max-width: 1000px; }
        .cse-card {
            background: #12121a;
            border: 1px solid #1e1e2e;
            border-radius: 16px;
            padding: 28px;
        }
        .cse-card h2 { font-size: 16px; font-weight: 700; color: #ff6b35; margin-bottom: 16px; text-transform: uppercase; letter-spacing: 1px; }

        .cse-key-box {
            background: #0a0a0f;
            border: 1px solid #2a2a3a;
            border-radius: 10px;
            padding: 14px 16px;
            font-family: 'DM Mono', monospace;
            font-size: 13px;
            color: #f7c59f;
            word-break: break-all;
            line-height: 1.6;
            margin-bottom: 16px;
        }
        .cse-key-box.empty { color: #444; font-style: italic; }

        .cse-url-box {
            background: #0a0a0f;
            border: 1px solid #2a2a3a;
            border-radius: 10px;
            padding: 14px 16px;
            font-family: 'DM Mono', monospace;
            font-size: 12px;
            color: #8888cc;
            word-break: break-all;
            line-height: 1.6;
            margin-bottom: 16px;
        }

        .cse-btn {
            display: inline-block;
            padding: 10px 20px;
            border-radius: 8px;
            font-family: 'Syne', sans-serif;
            font-size: 13px;
            font-weight: 700;
            cursor: pointer;
            border: none;
            transition: opacity 0.2s;
            text-decoration: none;
        }
        .cse-btn:hover { opacity: 0.85; }
        .cse-btn-primary { background: linear-gradient(135deg, #ff6b35, #f7c59f); color: #0a0a0f; }
        .cse-btn-copy { background: #1e1e2e; color: #8888cc; border: 1px solid #2a2a3a; margin-left: 8px; }

        .cse-steps { counter-reset: steps; list-style: none; }
        .cse-steps li {
            counter-increment: steps;
            display: flex;
            gap: 14px;
            align-items: flex-start;
            margin-bottom: 16px;
            font-size: 14px;
            color: #aaa;
            line-height: 1.5;
        }
        .cse-steps li::before {
            content: counter(steps);
            background: #ff6b35;
            color: #0a0a0f;
            font-weight: 800;
            font-size: 11px;
            min-width: 22px;
            height: 22px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-top: 1px;
        }
        .cse-steps li strong { color: #e8e8f0; }

        .cse-stat {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 10px 0;
            border-bottom: 1px solid #1e1e2e;
            font-size: 14px;
        }
        .cse-stat:last-child { border-bottom: none; }
        .cse-stat-val { font-family: 'DM Mono', monospace; color: #ff6b35; font-weight: 700; font-size: 18px; }

        .cse-full { grid-column: span 2; }
        </style>

        <div id="cat-sync-exporter-wrap">
            <div class="cse-header">
                <div>
                    <span class="cse-badge">Old Site</span>
                    <h1>Category Sync — Exporter</h1>
                    <p class="cse-subtitle">Exposes your categories via a secure API for the new site to consume</p>
                </div>
            </div>

            <div class="cse-grid">
                <!-- Stats -->
                <div class="cse-card">
                    <h2>📊 Current Stats</h2>
                    <?php
                    $all_cats = get_terms(['taxonomy' => 'category', 'hide_empty' => false]);
                    $all_posts = wp_count_posts();
                    ?>
                    <div class="cse-stat">
                        <span>Total Categories</span>
                        <span class="cse-stat-val"><?= count($all_cats) ?></span>
                    </div>
                    <div class="cse-stat">
                        <span>Published Posts</span>
                        <span class="cse-stat-val"><?= $all_posts->publish ?></span>
                    </div>
                    <div class="cse-stat">
                        <span>API Status</span>
                        <span class="cse-stat-val" style="color:<?= $secret_key ? '#4ade80' : '#f87171' ?>"><?= $secret_key ? '🟢 Ready' : '🔴 No Key' ?></span>
                    </div>
                </div>

                <!-- Key Generation -->
                <div class="cse-card">
                    <h2>🔑 Secret Key</h2>
                    <?php if ($secret_key): ?>
                        <div class="cse-key-box"><?= esc_html($secret_key) ?></div>
                        <button class="cse-btn cse-btn-copy" onclick="navigator.clipboard.writeText('<?= esc_js($secret_key) ?>');this.textContent='Copied!'">📋 Copy Key</button>
                    <?php else: ?>
                        <div class="cse-key-box empty">No key generated yet. Generate one below.</div>
                    <?php endif; ?>
                    <br><br>
                    <form method="post">
                        <?php wp_nonce_field('cat_sync_generate'); ?>
                        <button type="submit" name="cat_sync_generate_key" class="cse-btn cse-btn-primary">
                            <?= $secret_key ? '🔄 Regenerate Key' : '⚡ Generate Secret Key' ?>
                        </button>
                    </form>
                </div>

                <!-- API Endpoint -->
                <div class="cse-card cse-full">
                    <h2>🌐 API Endpoint (copy to new site)</h2>
                    <div class="cse-url-box"><?= esc_html($api_url) ?></div>
                    <button class="cse-btn cse-btn-copy" onclick="navigator.clipboard.writeText('<?= esc_js($api_url) ?>');this.textContent='Copied!'">📋 Copy URL</button>

                    <br><br>
                    <h2 style="margin-top:8px;">📋 How to Use</h2>
                    <ul class="cse-steps" style="margin-top:16px;">
                        <li><span><strong>Generate a secret key</strong> above — copy it</span></li>
                        <li><span>Copy the <strong>API Endpoint URL</strong> above</span></li>
                        <li><span>Go to your <strong>new site</strong> → install the <strong>Category Sync Importer</strong> plugin</span></li>
                        <li><span>Paste the URL + Key into the importer and click <strong>Run Sync</strong></span></li>
                        <li><span>All done! Posts will be auto-reassigned to correct categories 🎉</span></li>
                    </ul>
                </div>
            </div>
        </div>
        <?php
    }
}

new CategorySyncExporter();