<?php
/**
 * Plugin Name: Dumpster Rentals Dynamic Pages
 * Description: Dynamic dumpster rental city pages + 1 sub-services (porta potty) + virtual sitemap (max 15K URLs/file)
 * Version: 1.1
 * Author: Grok (adapted)
 * License: GPL2
 */

if (!defined('ABSPATH')) exit;

class DumpsterRentalsDynamicPages {
    private $cities = [];
    private $cities_file = 'cities.json'; // or use us-cities.json / ca-cities.json later

    private $sub_services = [
        'porta-potty-rentals' => [
            'name'     => 'Porta Potty Rentals',
            'template' => 'template-sub-porta-potty-rentals.html'
        ],
        ];

    private static $template_cache = [];
    private static $instance = null;

    const MAX_URLS_PER_SITEMAP = 15000;

    public function __construct() {
        self::$instance = $this;

        add_action('init', [$this, 'load_cities'], 5);
        add_action('init', [$this, 'add_rewrite_rules'], 20);
        add_action('init', [$this, 'add_sitemap_rewrites']);
        add_filter('query_vars', [$this, 'add_query_vars']);
        add_action('template_redirect', [$this, 'handle_template_redirect']);
    }

    public static function get_instance() {
        return self::$instance;
    }

    public function load_cities() {
        $file_path = plugin_dir_path(__FILE__) . $this->cities_file;
        if (file_exists($file_path)) {
            $json = file_get_contents($file_path);
            $data = json_decode($json, true);
            if (is_array($data)) {
                foreach ($data as $city) {
                    if (isset($city['slug'], $city['name'], $city['state'])) {
                        $slug = strtolower($city['slug']);
                        $this->cities[$slug] = [
                            'name'  => $city['name'],
                            'state' => strtoupper($city['state']),
                            'full'  => $city['name'] . ', ' . strtoupper($city['state'])
                        ];
                    }
                }
            }
        }
    }

    public function add_rewrite_rules() {
        // City home → dumpster-rentals-los-angeles/
        add_rewrite_rule(
            '^dumpster-rentals-([^/]+)/?$',
            'index.php?dumpster_city=$matches[1]',
            'top'
        );

        // Sub-service → porta-potty-rentals-los-angeles/ etc.
        $sub_slugs = array_keys($this->sub_services);
        $escaped   = array_map('preg_quote', $sub_slugs);
        $pattern   = '^(' . implode('|', $escaped) . ')-([^/]+)/?$';

        add_rewrite_rule(
            $pattern,
            'index.php?dumpster_sub_service=$matches[1]&dumpster_city=$matches[2]',
            'top'
        );
    }

    public function add_sitemap_rewrites() {
        add_rewrite_rule('^sitemap-dumpster-index\.xml$',   'index.php?dumpster_sitemap=index', 'top');
        add_rewrite_rule('^sitemap-dumpster-([0-9]+)\.xml$', 'index.php?dumpster_sitemap=$matches[1]', 'top');
    }

    public function add_query_vars($vars) {
        $vars[] = 'dumpster_city';
        $vars[] = 'dumpster_sub_service';
        $vars[] = 'dumpster_sitemap';
        return $vars;
    }

    public function handle_template_redirect() {
        $sitemap = get_query_var('dumpster_sitemap');
        if ($sitemap !== '') {
            if ($sitemap === 'index') {
                $this->render_sitemap_index();
            } else {
                $page = intval($sitemap);
                if ($page > 0) $this->render_sitemap_page($page);
            }
            exit;
        }

        $city_slug = get_query_var('dumpster_city');
        $sub_slug  = get_query_var('dumpster_sub_service');

        $city_slug = strtolower($city_slug);

        if ($city_slug && isset($this->cities[$city_slug])) {
            if ($sub_slug && array_key_exists($sub_slug, $this->sub_services)) {
                $this->render_sub_service_page($city_slug, $sub_slug);
            } elseif (!$sub_slug) {
                $this->render_city_home_page($city_slug);
            } else {
                $this->set_404();
            }
            exit;
        }
    }

    private function set_404() {
        global $wp_query;
        $wp_query->set_404();
        status_header(404);
        include get_404_template();
        exit;
    }

    private function render_city_home_page($city_lower) {
        $city = $this->cities[$city_lower];
        $city_full = $city['full'];

        $templates = ['template-city1.html', 'template-city2.html', 'template-city3.html', 'template-city4.html'];
        $chosen = $templates[array_rand($templates)];

        $content = $this->load_template($chosen);

        $content = str_replace(
            ['Enigma, GA', 'Enigma', 'GA'],
            [esc_html($city_full), esc_html($city['name']), esc_html($city['state'])],
            $content
        );

        $content = str_replace('Porta Potty Rentals', 'Dumpster Rentals', $content);

        $content .= $this->get_sub_services_list($city_lower);
        $content .= $this->get_random_cities_footer();

        echo $content;
    }

    private function render_sub_service_page($city_lower, $sub_slug) {
        $city = $this->cities[$city_lower];
        $city_full = $city['full'];
        $service = $this->sub_services[$sub_slug];

        $content = $this->load_template($service['template']);

        $content = str_replace(
            ['Enigma, GA', 'Enigma', 'GA', '#ServiceName'],
            [esc_html($city_full), esc_html($city['name']), esc_html($city['state']), esc_html($service['name'])],
            $content
        );

        $content .= $this->get_sub_services_list($city_lower);
        $content .= $this->get_random_cities_footer();

        echo $content;
    }

    private function load_template($filename) {
        if (!isset(self::$template_cache[$filename])) {
            $file_path = plugin_dir_path(__FILE__) . $filename;
            if (!file_exists($file_path)) {
                wp_die("Template missing: $filename");
            }
            self::$template_cache[$filename] = file_get_contents($file_path);
        }
        return self::$template_cache[$filename];
    }

    private function get_sub_services_list($city_lower) {
        $list = '<div class="sub-services-list" style="padding: 40px; background: #f8f8f8; text-align: center; margin: 40px 0 60px;"><h2>Our Waste Management Services in ' . esc_html($this->cities[$city_lower]['full']) . '</h2><div style="display: flex; flex-wrap: wrap; justify-content: center; gap: 20px; margin-top: 30px;">';
        foreach ($this->sub_services as $slug => $service) {
            $link = home_url("/{$slug}-{$city_lower}/");
            $list .= '<a href="' . esc_url($link) . '" style="padding: 15px 25px; background: #1e40af; color: white; border-radius: 8px; text-decoration: none; font-weight: 600;">' . esc_html($service['name']) . '</a>';
        }
        $list .= '</div></div>';
        return $list;
    }

    private function get_random_cities_footer() {
        $all_slugs = array_keys($this->cities);
        shuffle($all_slugs);
        $selected = array_slice($all_slugs, 0, 50);
        $footer = '<div style="padding: 60px 40px; background: #111827; color: white; text-align: center;"><h2 style="margin-bottom: 40px;">We Serve These Areas</h2><div style="display: flex; flex-wrap: wrap; justify-content: center; gap: 15px; max-width: 1200px; margin: 0 auto;">';
        foreach ($selected as $slug) {
            $name = $this->cities[$slug]['full'];
            $link = home_url("/dumpster-rentals-{$slug}/");
            $footer .= '<a href="' . esc_url($link) . '" style="color: #60a5fa; font-weight: 600; text-decoration: underline;">Dumpster Rentals ' . esc_html($name) . '</a>';
        }
        $footer .= '</div></div>';
        return $footer;
    }

    private function render_sitemap_index() {
        header('Content-Type: application/xml; charset=UTF-8');
        echo '<?xml version="1.0" encoding="UTF-8"?>';
        echo '<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">';
        $total_urls = count($this->cities) * (1 + count($this->sub_services));
        $pages = ceil($total_urls / self::MAX_URLS_PER_SITEMAP);
        for ($i = 1; $i <= $pages; $i++) {
            echo '<sitemap><loc>' . esc_url(home_url("/sitemap-dumpster-{$i}.xml")) . '</loc><lastmod>' . current_time('c') . '</lastmod></sitemap>';
        }
        echo '</sitemapindex>';
        exit;
    }

    private function render_sitemap_page($page) {
        header('Content-Type: application/xml; charset=UTF-8');
        echo '<?xml version="1.0" encoding="UTF-8"?>';
        echo '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">';

        $cities      = array_keys($this->cities);
        $sub_services = array_keys($this->sub_services);

        $start = ($page - 1) * self::MAX_URLS_PER_SITEMAP;
        $end   = $start + self::MAX_URLS_PER_SITEMAP;
        $current = 0;

        // City pages first
        foreach ($cities as $city_slug) {
            if ($current >= $end) break;
            if ($current >= $start) {
                echo '<url><loc>' . esc_url(home_url("/dumpster-rentals-{$city_slug}/")) . '</loc><lastmod>' . current_time('c') . '</lastmod><changefreq>weekly</changefreq><priority>0.8</priority></url>';
            }
            $current++;
        }

        // Sub-service pages
        foreach ($cities as $city_slug) {
            foreach ($sub_services as $sub_slug) {
                if ($current >= $end) break 2;
                if ($current >= $start) {
                    echo '<url><loc>' . esc_url(home_url("/{$sub_slug}-{$city_slug}/")) . '</loc><lastmod>' . current_time('c') . '</lastmod><changefreq>weekly</changefreq><priority>0.6</priority></url>';
                }
                $current++;
            }
        }

        echo '</urlset>';
        exit;
    }

    public function get_random_links($count = 300) {
        $count = min(intval($count), 1000);
        $slugs = array_keys($this->cities);
        $sub_slugs = array_keys($this->sub_services);

        if (empty($slugs)) return '<!-- No cities loaded -->';

        $output = '<div style="columns: 3; column-gap: 30px; line-height: 1.8; font-size: 0.95em;">';
        $used = [];

        for ($i = 0; $i < $count; $i++) {
            if (mt_rand(0, 3) === 0) { // ~25% main page
                $city_slug = $slugs[array_rand($slugs)];
                $url  = home_url("/dumpster-rentals-{$city_slug}/");
                $text = "Dumpster Rentals " . $this->cities[$city_slug]['full'];
            } else {
                $city_slug = $slugs[array_rand($slugs)];
                $sub_slug  = $sub_slugs[array_rand($sub_slugs)];
                $url  = home_url("/{$sub_slug}-{$city_slug}/");
                $text = $this->sub_services[$sub_slug]['name'] . " " . $this->cities[$city_slug]['full'];
            }

            if (in_array($url, $used)) { $i--; continue; }
            $used[] = $url;

            $output .= '<a href="' . esc_url($url) . '" style="display: block;">' . esc_html($text) . '</a>';
        }

        $output .= '</div>';
        return $output;
    }
}

// Shortcode
add_shortcode('random_dumpster_links', function($atts) {
    $atts = shortcode_atts(['count' => 300], $atts);
    $instance = DumpsterRentalsDynamicPages::get_instance();
    return $instance ? $instance->get_random_links($atts['count']) : '';
});

new DumpsterRentalsDynamicPages();

register_activation_hook(__FILE__, 'flush_rewrite_rules');
register_deactivation_hook(__FILE__, 'flush_rewrite_rules');


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font-weight: 600; text-decoration: underline;">Porta Potty Rentals Chillum, MD</a><a href="https://dumpsterservicesshelton.com/porta-potty-rentals-odem-tx/" style="color: #60a5fa; font-weight: 600; text-decoration: underline;">Porta Potty Rentals Odem, TX</a><a href="https://dumpsterservicesshelton.com/porta-potty-rentals-mendota-il/" style="color: #60a5fa; font-weight: 600; text-decoration: underline;">Porta Potty Rentals Mendota, IL</a><a href="https://dumpsterservicesshelton.com/porta-potty-rentals-floydada-tx/" style="color: #60a5fa; font-weight: 600; text-decoration: underline;">Porta Potty Rentals Floydada, TX</a><a href="https://dumpsterservicesshelton.com/porta-potty-rentals-albion-ne/" style="color: #60a5fa; font-weight: 600; text-decoration: underline;">Porta Potty Rentals Albion, NE</a><a href="https://dumpsterservicesshelton.com/porta-potty-rentals-ocean-park-wa/" style="color: #60a5fa; font-weight: 600; text-decoration: underline;">Porta Potty Rentals Ocean Park, WA</a><a href="https://dumpsterservicesshelton.com/porta-potty-rentals-cochranton-pa/" style="color: #60a5fa; 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