<?php

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

final class ThreeDL_CC_Free_Admin {
    private $plugin;

    public function __construct(ThreeDL_CC_Free_Plugin $plugin) {
        $this->plugin = $plugin;
    }

    public function hooks(): void {
        add_action('admin_menu', [$this, 'menu']);
        add_action('admin_init', [$this, 'register_settings']);
        add_action('admin_notices', [$this, 'environment_notice']);
        add_action('admin_enqueue_scripts', [$this, 'enqueue_admin_assets']);
    }


    public function enqueue_admin_assets(string $hook_suffix): void {
        if ($hook_suffix !== 'woocommerce_page_3dl-central-checkout') {
            return;
        }

        wp_enqueue_script(
            '3dl-cc-free-admin',
            THREEDL_CC_FREE_URL . 'assets/js/admin.js',
            [],
            THREEDL_CC_FREE_VERSION,
            true
        );
    }

    public function menu(): void {
        if (!current_user_can('manage_woocommerce')) {
            return;
        }
        add_submenu_page(
            'woocommerce',
            __('3DL Central Checkout', '3dl-central-checkout-for-woocommerce'),
            __('3DL Central Checkout', '3dl-central-checkout-for-woocommerce'),
            'manage_woocommerce',
            '3dl-central-checkout',
            [$this, 'render_page']
        );
    }

    public function register_settings(): void {
        register_setting('3dl_cc_free_settings', ThreeDL_CC_Free_Plugin::OPTION_KEY, [
            'type' => 'array',
            'sanitize_callback' => [$this, 'sanitize_options'],
            'default' => ThreeDL_CC_Free_Plugin::default_options(),
        ]);
    }

    public function sanitize_options($input): array {
        $input = is_array($input) ? $input : [];
        $old = $this->plugin->get_options();
        $mode = isset($input['mode']) ? sanitize_key((string) $input['mode']) : 'disabled';
        if (!in_array($mode, ['disabled', 'main', 'source'], true)) {
            $mode = 'disabled';
        }

        $secret = isset($input['secret_key']) ? preg_replace('/[^A-Za-z0-9_\-]/', '', (string) $input['secret_key']) : '';
        $secret = substr((string) $secret, 0, 128);

        $trusted = isset($input['trusted_sources']) ? sanitize_textarea_field((string) $input['trusted_sources']) : '';
        $trusted_lines = preg_split('/\r\n|\r|\n/', $trusted) ?: [];
        $clean_trusted = [];
        foreach ($trusted_lines as $line) {
            $url = esc_url_raw(trim((string) $line));
            if ($url !== '') {
                $clean_trusted[] = trailingslashit(untrailingslashit($url));
            }
        }

        $result = [
            'mode' => $mode,
            'main_store_url' => isset($input['main_store_url']) ? esc_url_raw((string) $input['main_store_url']) : '',
            'secret_key' => $secret,
            'trusted_sources' => implode("\n", array_values(array_unique($clean_trusted))),
            'transfer_ttl' => min(1800, max(60, absint($input['transfer_ttl'] ?? 600))),
            'after_add' => isset($input['after_add']) && in_array(sanitize_key((string) $input['after_add']), ['return_source', 'cart'], true)
                ? sanitize_key((string) $input['after_add'])
                : 'return_source',
        ];

        // Keep role-specific settings clean so a Source store cannot accidentally retain a Main-store allow-list,
        // and a Main store always derives its own URL from WordPress rather than a stale saved value.
        if ($mode === 'main') {
            $result['main_store_url'] = '';
        } elseif ($mode === 'source') {
            $result['trusted_sources'] = '';
        } else {
            // Disabling the runtime should not destroy a configuration the administrator may want to re-enable later.
            $result['main_store_url'] = (string) ($old['main_store_url'] ?? $result['main_store_url']);
            $result['secret_key'] = (string) ($old['secret_key'] ?? $result['secret_key']);
            $result['trusted_sources'] = (string) ($old['trusted_sources'] ?? $result['trusted_sources']);
            $result['transfer_ttl'] = absint($old['transfer_ttl'] ?? $result['transfer_ttl']);
            $result['after_add'] = (string) ($old['after_add'] ?? $result['after_add']);
        }

        if ($mode === 'main' && $result['secret_key'] === '' && empty($old['secret_key'])) {
            $result['secret_key'] = wp_generate_password(64, false, false);
        }

        $this->plugin->clear_options_cache();
        return $result;
    }

    public function environment_notice(): void {
        if (!current_user_can('manage_woocommerce')) {
            return;
        }
        if (!is_multisite()) {
            echo '<div class="notice notice-warning"><p><strong>' . esc_html__('3DL Central Checkout:', '3dl-central-checkout-for-woocommerce') . '</strong> ' . esc_html__('This free plugin is designed for WordPress Multisite.', '3dl-central-checkout-for-woocommerce') . '</p></div>';
        }
        if (!$this->plugin->woocommerce_active()) {
            echo '<div class="notice notice-warning"><p><strong>' . esc_html__('3DL Central Checkout:', '3dl-central-checkout-for-woocommerce') . '</strong> ' . esc_html__('WooCommerce must be active on every store that participates in the central cart.', '3dl-central-checkout-for-woocommerce') . '</p></div>';
        }
        if ($this->plugin->pro_active()) {
            echo '<div class="notice notice-info"><p><strong>' . esc_html__('3DL Central Checkout:', '3dl-central-checkout-for-woocommerce') . '</strong> ' . esc_html__('PRO is active on this site, so the free runtime is paused to avoid duplicate cart handlers.', '3dl-central-checkout-for-woocommerce') . '</p></div>';
        }
    }

    private function configuration_ready(string $mode, array $options): bool {
        if ($mode === 'main') {
            return $this->plugin->get_secret() !== '' && !empty($this->plugin->trusted_sources());
        }
        if ($mode === 'source') {
            return $this->plugin->get_secret() !== '' && $this->plugin->main_store_url() !== '';
        }
        return false;
    }

    public function render_page(): void {
        if (!current_user_can('manage_woocommerce')) {
            wp_die(esc_html__('You do not have permission to manage this plugin.', '3dl-central-checkout-for-woocommerce'));
        }

        $o = $this->plugin->get_options();
        $mode = $this->plugin->get_mode();
        $configuration_ready = $this->configuration_ready($mode, $o);
        $current_url = trailingslashit(home_url('/'));
        ?>
        <div class="wrap">
            <h1><?php echo esc_html__('3DL Central Checkout for WooCommerce', '3dl-central-checkout-for-woocommerce'); ?></h1>
            <p><?php echo esc_html__('FREE creates one central WooCommerce cart and checkout for stores inside a WordPress Multisite network. The Main store owns the real cart, checkout and final order; Source stores send products to it.', '3dl-central-checkout-for-woocommerce'); ?></p>

            <div style="max-width:1080px;display:grid;grid-template-columns:minmax(0,2fr) minmax(300px,1fr);gap:24px;align-items:start">
                <div>
                    <form method="post" action="options.php">
                        <?php settings_fields('3dl_cc_free_settings'); ?>
                        <table class="form-table" role="presentation">
                            <tr>
                                <th scope="row"><label for="3dl-cc-mode"><?php echo esc_html__('Store role', '3dl-central-checkout-for-woocommerce'); ?></label></th>
                                <td>
                                    <select id="3dl-cc-mode" name="<?php echo esc_attr(ThreeDL_CC_Free_Plugin::OPTION_KEY); ?>[mode]">
                                        <option value="disabled" <?php selected($mode, 'disabled'); ?>><?php echo esc_html__('Disabled', '3dl-central-checkout-for-woocommerce'); ?></option>
                                        <option value="main" <?php selected($mode, 'main'); ?>><?php echo esc_html__('Main store — central cart and checkout', '3dl-central-checkout-for-woocommerce'); ?></option>
                                        <option value="source" <?php selected($mode, 'source'); ?>><?php echo esc_html__('Source store — sends products to the main store', '3dl-central-checkout-for-woocommerce'); ?></option>
                                    </select>
                                    <p class="description"><?php echo esc_html__('Install and activate the same free plugin on the Main store and every Source store. Configure each site with the correct role.', '3dl-central-checkout-for-woocommerce'); ?></p>
                                </td>
                            </tr>
                            <tr data-3dl-role="source">
                                <th scope="row"><label for="3dl-cc-main-url"><?php echo esc_html__('Main store URL', '3dl-central-checkout-for-woocommerce'); ?></label></th>
                                <td>
                                    <input id="3dl-cc-main-url" class="regular-text code" type="url" name="<?php echo esc_attr(ThreeDL_CC_Free_Plugin::OPTION_KEY); ?>[main_store_url]" value="<?php echo esc_attr((string) ($o['main_store_url'] ?? '')); ?>" placeholder="https://example.com/">
                                    <p class="description"><?php echo esc_html__('Enter the exact home URL of the Main store, including https://. Example: https://example.com/', '3dl-central-checkout-for-woocommerce'); ?></p>
                                </td>
                            </tr>
                            <tr data-3dl-role="main,source">
                                <th scope="row"><label for="3dl-cc-secret"><?php echo esc_html__('Shared secret key', '3dl-central-checkout-for-woocommerce'); ?></label></th>
                                <td>
                                    <input id="3dl-cc-secret" class="large-text code" autocomplete="off" type="text" name="<?php echo esc_attr(ThreeDL_CC_Free_Plugin::OPTION_KEY); ?>[secret_key]" value="<?php echo esc_attr((string) ($o['secret_key'] ?? '')); ?>">
                                    <p class="description" data-3dl-role="main"><?php echo esc_html__('Generate the key on the Main store, then copy exactly the same key to every Source store.', '3dl-central-checkout-for-woocommerce'); ?></p>
                                    <p class="description" data-3dl-role="source"><?php echo esc_html__('Paste the exact key from the Main store. Do not create a different key on a Source store.', '3dl-central-checkout-for-woocommerce'); ?></p>
                                    <span data-3dl-role="main"><button type="button" class="button" id="3dl-cc-generate-secret"><?php echo esc_html__('Generate new key', '3dl-central-checkout-for-woocommerce'); ?></button></span>
                                </td>
                            </tr>
                            <tr data-3dl-role="main">
                                <th scope="row"><label for="3dl-cc-trusted"><?php echo esc_html__('Trusted source store URLs', '3dl-central-checkout-for-woocommerce'); ?></label></th>
                                <td>
                                    <textarea id="3dl-cc-trusted" class="large-text code" rows="6" name="<?php echo esc_attr(ThreeDL_CC_Free_Plugin::OPTION_KEY); ?>[trusted_sources]" placeholder="https://example.com/shop-a/&#10;https://example.com/shop-b/"><?php echo esc_textarea((string) ($o['trusted_sources'] ?? '')); ?></textarea>
                                    <p class="description"><?php echo esc_html__('Main store only. Put the exact home URL of each allowed Source store on its own line. This is a security allow-list.', '3dl-central-checkout-for-woocommerce'); ?></p>
                                </td>
                            </tr>
                            <tr data-3dl-role="source">
                                <th scope="row"><label for="3dl-cc-after-add"><?php echo esc_html__('After adding a product', '3dl-central-checkout-for-woocommerce'); ?></label></th>
                                <td>
                                    <select id="3dl-cc-after-add" name="<?php echo esc_attr(ThreeDL_CC_Free_Plugin::OPTION_KEY); ?>[after_add]">
                                        <option value="return_source" <?php selected((string) ($o['after_add'] ?? 'return_source'), 'return_source'); ?>><?php echo esc_html__('Return to the Source store (recommended)', '3dl-central-checkout-for-woocommerce'); ?></option>
                                        <option value="cart" <?php selected((string) ($o['after_add'] ?? 'return_source'), 'cart'); ?>><?php echo esc_html__('Open the central cart', '3dl-central-checkout-for-woocommerce'); ?></option>
                                    </select>
                                    <p class="description"><?php echo esc_html__('The product is always added to the Main-store cart. Choose whether the customer returns to the Source store to continue shopping or sees the central cart immediately.', '3dl-central-checkout-for-woocommerce'); ?></p>
                                </td>
                            </tr>
                            <tr data-3dl-role="main,source">
                                <th scope="row"><label for="3dl-cc-ttl"><?php echo esc_html__('Transfer link lifetime', '3dl-central-checkout-for-woocommerce'); ?></label></th>
                                <td>
                                    <input id="3dl-cc-ttl" type="number" min="60" max="1800" step="30" name="<?php echo esc_attr(ThreeDL_CC_Free_Plugin::OPTION_KEY); ?>[transfer_ttl]" value="<?php echo esc_attr((string) absint($o['transfer_ttl'] ?? 600)); ?>"> <?php echo esc_html__('seconds', '3dl-central-checkout-for-woocommerce'); ?>
                                    <p class="description"><?php echo esc_html__('Signed product transfer links expire automatically. The default 600 seconds is suitable for most stores.', '3dl-central-checkout-for-woocommerce'); ?></p>
                                </td>
                            </tr>
                        </table>
                        <?php submit_button(); ?>
                    </form>

                    <div class="postbox" style="margin-top:24px;padding:18px">
                        <h2 style="margin-top:0"><?php echo esc_html__('Quick setup guide', '3dl-central-checkout-for-woocommerce'); ?></h2>

                        <div data-3dl-role="disabled">
                            <p><?php echo esc_html__('Choose whether this site is the Main store or a Source store. The page will then show only the settings needed for that role.', '3dl-central-checkout-for-woocommerce'); ?></p>
                        </div>

                        <div data-3dl-role="main">
                            <ol>
                                <li><?php echo esc_html__('Set this site to Main store.', '3dl-central-checkout-for-woocommerce'); ?></li>
                                <li><?php echo esc_html__('Generate a shared secret key here. Copy it to every Source store.', '3dl-central-checkout-for-woocommerce'); ?></li>
                                <li><?php echo esc_html__('Add each Source store home URL to Trusted source store URLs, one URL per line.', '3dl-central-checkout-for-woocommerce'); ?></li>
                                <li><?php echo esc_html__('Save the settings.', '3dl-central-checkout-for-woocommerce'); ?></li>
                                <li><?php echo esc_html__('Configure every Source store with this Main store URL and the same secret key.', '3dl-central-checkout-for-woocommerce'); ?></li>
                            </ol>
                            <p><strong><?php echo esc_html__('This Main store URL:', '3dl-central-checkout-for-woocommerce'); ?></strong> <code><?php echo esc_html($current_url); ?></code></p>
                        </div>

                        <div data-3dl-role="source">
                            <ol>
                                <li><?php echo esc_html__('Set this site to Source store.', '3dl-central-checkout-for-woocommerce'); ?></li>
                                <li><?php echo esc_html__('Enter the Main store home URL.', '3dl-central-checkout-for-woocommerce'); ?></li>
                                <li><?php echo esc_html__('Paste the same secret key that was generated on the Main store.', '3dl-central-checkout-for-woocommerce'); ?></li>
                                <li><?php echo esc_html__('Save the settings.', '3dl-central-checkout-for-woocommerce'); ?></li>
                                <li><?php echo esc_html__('On the Main store, add this Source store URL to the trusted-source list.', '3dl-central-checkout-for-woocommerce'); ?></li>
                                <li><?php echo esc_html__('Choose what should happen after add-to-cart. Returning to the Source store is recommended so the customer can keep shopping.', '3dl-central-checkout-for-woocommerce'); ?></li>
                                <li><?php echo esc_html__('Test by adding one product on this Source store, then open the cart. The product should be present in the Main-store central cart.', '3dl-central-checkout-for-woocommerce'); ?></li>
                                <li><?php echo esc_html__('The Source-store cart badge is only a read-only count of the Main-store cart when available. The real cart and checkout remain on the Main store; FREE does not create a second editable cart.', '3dl-central-checkout-for-woocommerce'); ?></li>
                            </ol>
                            <p><strong><?php echo esc_html__('This Source store URL:', '3dl-central-checkout-for-woocommerce'); ?></strong> <code><?php echo esc_html($current_url); ?></code></p>
                        </div>
                    </div>
                </div>

                <div>
                    <div class="postbox" style="padding:16px">
                        <h2 style="margin-top:0"><?php echo esc_html__('Status', '3dl-central-checkout-for-woocommerce'); ?></h2>
                        <p><strong><?php echo esc_html__('WordPress Multisite:', '3dl-central-checkout-for-woocommerce'); ?></strong> <?php echo is_multisite() ? esc_html__('Yes', '3dl-central-checkout-for-woocommerce') : esc_html__('No', '3dl-central-checkout-for-woocommerce'); ?></p>
                        <p><strong><?php echo esc_html__('WooCommerce:', '3dl-central-checkout-for-woocommerce'); ?></strong> <?php echo $this->plugin->woocommerce_active() ? esc_html__('Active', '3dl-central-checkout-for-woocommerce') : esc_html__('Not active', '3dl-central-checkout-for-woocommerce'); ?></p>
                        <?php $mode_label = $mode === 'main' ? __('Main store', '3dl-central-checkout-for-woocommerce') : ($mode === 'source' ? __('Source store', '3dl-central-checkout-for-woocommerce') : __('Disabled', '3dl-central-checkout-for-woocommerce')); ?>
                        <p><strong><?php echo esc_html__('Role:', '3dl-central-checkout-for-woocommerce'); ?></strong> <?php echo esc_html($mode_label); ?></p>
                        <p><strong><?php echo esc_html__('Secret key:', '3dl-central-checkout-for-woocommerce'); ?></strong> <?php echo $this->plugin->get_secret() !== '' ? esc_html__('Configured', '3dl-central-checkout-for-woocommerce') : esc_html__('Missing', '3dl-central-checkout-for-woocommerce'); ?></p>
                        <p><strong><?php echo esc_html__('Configuration:', '3dl-central-checkout-for-woocommerce'); ?></strong> <?php echo $configuration_ready ? esc_html__('Ready', '3dl-central-checkout-for-woocommerce') : esc_html__('Incomplete', '3dl-central-checkout-for-woocommerce'); ?></p>
                    </div>

                    <div class="postbox" style="padding:16px">
                        <h2 style="margin-top:0"><?php echo esc_html__('What the free version does', '3dl-central-checkout-for-woocommerce'); ?></h2>
                        <p><?php echo esc_html__('A product added on a Source store is securely transferred to the Main store, where it joins products from other stores in one WooCommerce cart and checkout. FREE supports simple products, variable products, selected variations and requested quantities, subject to the Source-store checks.', '3dl-central-checkout-for-woocommerce'); ?></p>
                        <p><strong><?php echo esc_html__('Important:', '3dl-central-checkout-for-woocommerce'); ?></strong> <?php echo esc_html__('FREE does not reserve or deduct stock on Source stores, create Source-side order records, or synchronize refunds and order statuses back to Source stores.', '3dl-central-checkout-for-woocommerce'); ?></p>
                    </div>

                    <div class="postbox" style="padding:16px">
                        <h2 style="margin-top:0"><?php echo esc_html__('After a FREE order', '3dl-central-checkout-for-woocommerce'); ?></h2>
                        <p><?php echo esc_html__('The final WooCommerce order is created only on the Main store. Remote order items keep their Source store URL and original product ID so their origin remains visible.', '3dl-central-checkout-for-woocommerce'); ?></p>
                        <p><?php echo esc_html__('Source-store stock is not reserved or deducted by FREE. Use PRO when Source stores must receive order records and stock, refund or status synchronization.', '3dl-central-checkout-for-woocommerce'); ?></p>
                    </div>

                    <div class="postbox" style="padding:16px">
                        <h2 style="margin-top:0"><?php echo esc_html__('Need production synchronization?', '3dl-central-checkout-for-woocommerce'); ?></h2>
                        <p><?php echo esc_html__('3DL Central Checkout PRO adds a live editable cart across stores, source-stock deduction and restocking, Source-side order records, refund and order-status synchronization, diagnostics and maintenance tools.', '3dl-central-checkout-for-woocommerce'); ?></p>
                        <p><a class="button" href="https://3dragonlabs.com/" target="_blank" rel="noopener noreferrer"><?php echo esc_html__('Learn about PRO', '3dl-central-checkout-for-woocommerce'); ?></a></p>
                    </div>
                </div>
            </div>
        </div>
        <?php
    }
}