<?php
/**
 * WooCommerce Settings Integration
 *
 * Adds Tier & Package Prices settings to WooCommerce Settings with sub-tabs
 *
 * @package WC_Tier_Package_Prices
 */

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

if (!class_exists('WC_Settings_Page')) {
    return;
}

/**
 * WC_TPP_Settings class
 */
if (!class_exists('WC_TPP_Settings')) {
    class WC_TPP_Settings extends WC_Settings_Page {

        /**
         * Constructor
         */
        public function __construct() {
            $this->id    = 'tier_package_prices';
            $this->label = __('Tier & Package Prices', 'wc-tier-package-prices');

            parent::__construct();

            // Add AJAX handlers for license validation
            add_action('wp_ajax_wc_tpp_validate_license', array($this, 'ajax_validate_license'));
            add_action('wp_ajax_wc_tpp_activate_license', array($this, 'ajax_activate_license'));
        }

        /**
         * Get own sections - Modern WooCommerce pattern
         *
         * @return array
         */
        protected function get_own_sections() {
            return array(
                ''        => __('General', 'wc-tier-package-prices'),
                'license' => __('License', 'wc-tier-package-prices'),
            );
        }

        /**
         * Get settings for the default (General) section
         *
         * @return array
         */
        protected function get_settings_for_default_section() {
            return array(
                array(
                    'title' => __('Tier & Package Prices Settings', 'wc-tier-package-prices'),
                    'type'  => 'title',
                    'desc'  => __('Configure tier pricing and package pricing options for your WooCommerce products.', 'wc-tier-package-prices'),
                    'id'    => 'wc_tpp_settings',
                ),

                array(
                    'title'    => __('Enable Tier Pricing', 'wc-tier-package-prices'),
                    'desc'     => __('Enable tier pricing for products', 'wc-tier-package-prices'),
                    'id'       => 'wc_tpp_enable_tier_pricing',
                    'default'  => 'yes',
                    'type'     => 'checkbox',
                    'desc_tip' => __('Allow quantity-based pricing tiers. Customers get discounted prices when buying in larger quantities.', 'wc-tier-package-prices'),
                ),

                array(
                    'title'    => __('Enable Package Pricing', 'wc-tier-package-prices'),
                    'desc'     => __('Enable fixed-price packages for products', 'wc-tier-package-prices'),
                    'id'       => 'wc_tpp_enable_package_pricing',
                    'default'  => 'yes',
                    'type'     => 'checkbox',
                    'desc_tip' => __('Allow fixed-price packages with specific quantities. For example: 10 pieces for $50, 25 pieces for $100.', 'wc-tier-package-prices'),
                ),

                array(
                    'title'    => __('Display Pricing Table', 'wc-tier-package-prices'),
                    'desc'     => __('Show tier and package pricing table on product pages', 'wc-tier-package-prices'),
                    'id'       => 'wc_tpp_display_table',
                    'default'  => 'yes',
                    'type'     => 'checkbox',
                    'desc_tip' => __('Display the pricing table to customers on product pages.', 'wc-tier-package-prices'),
                ),

                array(
                    'title'    => __('Display Position', 'wc-tier-package-prices'),
                    'desc'     => __('Choose where to display the pricing table on product pages.', 'wc-tier-package-prices'),
                    'id'       => 'wc_tpp_display_position',
                    'default'  => 'after_add_to_cart',
                    'type'     => 'select',
                    'class'    => 'wc-enhanced-select',
                    'css'      => 'min-width:300px;',
                    'desc_tip' => true,
                    'options'  => array(
                        'before_add_to_cart' => __('Before Add to Cart Button', 'wc-tier-package-prices'),
                        'after_add_to_cart'  => __('After Add to Cart Button', 'wc-tier-package-prices'),
                        'after_price'        => __('After Price', 'wc-tier-package-prices'),
                    ),
                ),

                array(
                    'title'    => __('Restrict to Package Quantities', 'wc-tier-package-prices'),
                    'desc'     => __('Limit quantities to defined package sizes only', 'wc-tier-package-prices'),
                    'id'       => 'wc_tpp_restrict_package_quantities',
                    'default'  => 'no',
                    'type'     => 'checkbox',
                    'desc_tip' => __('When enabled, customers can only purchase products in the exact quantities defined in packages. The quantity input field will be hidden and replaced with package selection buttons.', 'wc-tier-package-prices'),
                ),

                array(
                    'type' => 'sectionend',
                    'id'   => 'wc_tpp_settings',
                ),
            );
        }

        /**
         * Get settings for the License section
         *
         * @return array
         */
        protected function get_settings_for_license_section() {
            return array(
                array(
                    'title' => __('License Management', 'wc-tier-package-prices'),
                    'type'  => 'title',
                    'desc'  => __('Enter your license key to receive updates and support.', 'wc-tier-package-prices'),
                    'id'    => 'wc_tpp_license_settings',
                ),

                array(
                    'title'    => __('License Server URL', 'wc-tier-package-prices'),
                    'desc'     => __('The URL of the license server.', 'wc-tier-package-prices'),
                    'id'       => 'wc_tpp_license_server_url',
                    'type'     => 'url',
                    'default'  => '',
                    'css'      => 'min-width:400px;',
                    'desc_tip' => true,
                ),

                array(
                    'title'    => __('License Key', 'wc-tier-package-prices'),
                    'desc'     => __('Your license key for this plugin.', 'wc-tier-package-prices'),
                    'id'       => 'wc_tpp_license_key',
                    'type'     => 'text',
                    'default'  => '',
                    'css'      => 'min-width:400px;',
                    'desc_tip' => true,
                ),

                array(
                    'title' => __('License Status', 'wc-tier-package-prices'),
                    'type'  => 'wc_tpp_license_status',
                    'id'    => 'wc_tpp_license_status_display',
                ),

                array(
                    'type' => 'sectionend',
                    'id'   => 'wc_tpp_license_settings',
                ),
            );
        }

        /**
         * Get cached license status
         *
         * @return array|false
         */
        private function get_cached_license_status() {
            return get_transient('wc_tpp_license_status');
        }

        /**
         * AJAX handler for license validation
         */
        public function ajax_validate_license() {
            check_ajax_referer('wc_tpp_license_nonce', 'nonce');

            if (!current_user_can('manage_woocommerce')) {
                wp_send_json_error(array('message' => __('Permission denied.', 'wc-tier-package-prices')));
            }

            $license_key = sanitize_text_field(wp_unslash($_POST['license_key'] ?? ''));
            $server_url = esc_url_raw(wp_unslash($_POST['server_url'] ?? ''));

            if (empty($license_key) || empty($server_url)) {
                wp_send_json_error(array('message' => __('License key and server URL are required.', 'wc-tier-package-prices')));
            }

            try {
                $client = $this->get_license_client($server_url);
                $domain = $this->get_current_domain();
                $result = $client->validate($license_key, $domain);

                // Cache the status
                set_transient('wc_tpp_license_status', array(
                    'valid'      => true,
                    'product_id' => $result->productId,
                    'expires_at' => $result->expiresAt?->format('Y-m-d H:i:s'),
                    'is_lifetime' => $result->isLifetime(),
                    'checked_at' => current_time('mysql'),
                ), DAY_IN_SECONDS);

                wp_send_json_success(array(
                    'message' => __('License is valid!', 'wc-tier-package-prices'),
                    'status'  => $this->get_cached_license_status(),
                ));

            } catch (\Magdev\WcLicensedProductClient\Exception\LicenseException $e) {
                delete_transient('wc_tpp_license_status');
                wp_send_json_error(array(
                    'message' => $e->getMessage(),
                    'code'    => $e->errorCode ?? 'unknown',
                ));
            } catch (\Exception $e) {
                delete_transient('wc_tpp_license_status');
                wp_send_json_error(array(
                    'message' => $e->getMessage(),
                    'code'    => 'exception',
                ));
            }
        }

        /**
         * AJAX handler for license activation
         */
        public function ajax_activate_license() {
            check_ajax_referer('wc_tpp_license_nonce', 'nonce');

            if (!current_user_can('manage_woocommerce')) {
                wp_send_json_error(array('message' => __('Permission denied.', 'wc-tier-package-prices')));
            }

            $license_key = sanitize_text_field(wp_unslash($_POST['license_key'] ?? ''));
            $server_url = esc_url_raw(wp_unslash($_POST['server_url'] ?? ''));

            if (empty($license_key) || empty($server_url)) {
                wp_send_json_error(array('message' => __('License key and server URL are required.', 'wc-tier-package-prices')));
            }

            try {
                $client = $this->get_license_client($server_url);
                $domain = $this->get_current_domain();
                $result = $client->activate($license_key, $domain);

                if ($result->success) {
                    // Validate to get full status after activation
                    $validate_result = $client->validate($license_key, $domain);

                    set_transient('wc_tpp_license_status', array(
                        'valid'      => true,
                        'product_id' => $validate_result->productId,
                        'expires_at' => $validate_result->expiresAt?->format('Y-m-d H:i:s'),
                        'is_lifetime' => $validate_result->isLifetime(),
                        'checked_at' => current_time('mysql'),
                    ), DAY_IN_SECONDS);

                    wp_send_json_success(array(
                        'message' => __('License activated successfully!', 'wc-tier-package-prices'),
                        'status'  => $this->get_cached_license_status(),
                    ));
                }

                wp_send_json_error(array('message' => $result->message));

            } catch (\Magdev\WcLicensedProductClient\Exception\LicenseException $e) {
                wp_send_json_error(array(
                    'message' => $e->getMessage(),
                    'code'    => $e->errorCode ?? 'unknown',
                ));
            } catch (\Exception $e) {
                wp_send_json_error(array(
                    'message' => $e->getMessage(),
                    'code'    => 'exception',
                ));
            }
        }

        /**
         * Get license client instance
         *
         * @param string $server_url License server URL.
         * @return \Magdev\WcLicensedProductClient\LicenseClientInterface
         */
        private function get_license_client(string $server_url): \Magdev\WcLicensedProductClient\LicenseClientInterface {
            $httpClient = \Symfony\Component\HttpClient\HttpClient::create();
            return new \Magdev\WcLicensedProductClient\LicenseClient(
                httpClient: $httpClient,
                baseUrl: $server_url,
            );
        }

        /**
         * Get current domain for license validation
         *
         * @return string
         */
        private function get_current_domain(): string {
            return wp_parse_url(home_url(), PHP_URL_HOST);
        }

        /**
         * Output the settings
         */
        public function output() {
            global $current_section;

            // Register custom field type for license status display
            add_action('woocommerce_admin_field_wc_tpp_license_status', array($this, 'output_license_status_field'));

            parent::output();

            // Add JavaScript for license section
            if ('license' === $current_section) {
                $this->output_license_scripts();
            }
        }

        /**
         * Output license status custom field
         *
         * @param array $value Field configuration.
         */
        public function output_license_status_field($value) {
            $status = $this->get_cached_license_status();
            ?>
            <tr valign="top">
                <th scope="row" class="titledesc">
                    <label><?php esc_html_e('License Status', 'wc-tier-package-prices'); ?></label>
                </th>
                <td class="forminp">
                    <div id="wc-tpp-license-status-container" class="<?php echo !empty($status['valid']) ? 'valid' : 'invalid'; ?>">
                        <?php $this->render_license_status_html($status); ?>
                    </div>
                    <p class="description" style="margin-top: 10px;">
                        <button type="button" class="button" id="wc-tpp-validate-license">
                            <?php esc_html_e('Validate License', 'wc-tier-package-prices'); ?>
                        </button>
                        <button type="button" class="button" id="wc-tpp-activate-license">
                            <?php esc_html_e('Activate License', 'wc-tier-package-prices'); ?>
                        </button>
                        <span class="spinner" id="wc-tpp-license-spinner"></span>
                    </p>
                </td>
            </tr>
            <?php
        }

        /**
         * Render license status HTML
         *
         * @param array|false $status License status data.
         */
        private function render_license_status_html($status) {
            if (empty($status)) {
                echo '<span class="wc-tpp-license-inactive">' . esc_html__('No license activated', 'wc-tier-package-prices') . '</span>';
                return;
            }

            if (!empty($status['valid'])) {
                echo '<span class="wc-tpp-license-active">' . esc_html__('License Active', 'wc-tier-package-prices') . '</span>';
                if (!empty($status['expires_at']) && empty($status['is_lifetime'])) {
                    echo '<br><small>' . sprintf(
                        /* translators: %s: Expiration date */
                        esc_html__('Expires: %s', 'wc-tier-package-prices'),
                        esc_html($status['expires_at'])
                    ) . '</small>';
                } elseif (!empty($status['is_lifetime'])) {
                    echo '<br><small>' . esc_html__('Lifetime License', 'wc-tier-package-prices') . '</small>';
                }
                if (!empty($status['checked_at'])) {
                    echo '<br><small>' . sprintf(
                        /* translators: %s: Last check timestamp */
                        esc_html__('Last checked: %s', 'wc-tier-package-prices'),
                        esc_html($status['checked_at'])
                    ) . '</small>';
                }
            } else {
                echo '<span class="wc-tpp-license-inactive">' . esc_html__('License Invalid', 'wc-tier-package-prices') . '</span>';
            }
        }

        /**
         * Output JavaScript for license management
         */
        private function output_license_scripts() {
            $nonce = wp_create_nonce('wc_tpp_license_nonce');
            ?>
            <script type="text/javascript">
            jQuery(function($) {
                var $validateBtn = $('#wc-tpp-validate-license');
                var $activateBtn = $('#wc-tpp-activate-license');
                var $spinner = $('#wc-tpp-license-spinner');

                function getLicenseData() {
                    return {
                        license_key: $('#wc_tpp_license_key').val(),
                        server_url: $('#wc_tpp_license_server_url').val(),
                        nonce: '<?php echo esc_js($nonce); ?>'
                    };
                }

                function showSpinner() {
                    $spinner.addClass('is-active');
                    $validateBtn.prop('disabled', true);
                    $activateBtn.prop('disabled', true);
                }

                function hideSpinner() {
                    $spinner.removeClass('is-active');
                    $validateBtn.prop('disabled', false);
                    $activateBtn.prop('disabled', false);
                }

                $validateBtn.on('click', function() {
                    var data = getLicenseData();
                    if (!data.license_key || !data.server_url) {
                        alert('<?php echo esc_js(__('Please enter both license server URL and license key.', 'wc-tier-package-prices')); ?>');
                        return;
                    }

                    showSpinner();
                    $.post(ajaxurl, $.extend({action: 'wc_tpp_validate_license'}, data))
                        .done(function(response) {
                            if (response.success) {
                                alert(response.data.message);
                                location.reload();
                            } else {
                                alert(response.data.message || '<?php echo esc_js(__('Validation failed.', 'wc-tier-package-prices')); ?>');
                            }
                        })
                        .fail(function() {
                            alert('<?php echo esc_js(__('Request failed. Please try again.', 'wc-tier-package-prices')); ?>');
                        })
                        .always(hideSpinner);
                });

                $activateBtn.on('click', function() {
                    var data = getLicenseData();
                    if (!data.license_key || !data.server_url) {
                        alert('<?php echo esc_js(__('Please enter both license server URL and license key.', 'wc-tier-package-prices')); ?>');
                        return;
                    }

                    showSpinner();
                    $.post(ajaxurl, $.extend({action: 'wc_tpp_activate_license'}, data))
                        .done(function(response) {
                            if (response.success) {
                                alert(response.data.message);
                                location.reload();
                            } else {
                                alert(response.data.message || '<?php echo esc_js(__('Activation failed.', 'wc-tier-package-prices')); ?>');
                            }
                        })
                        .fail(function() {
                            alert('<?php echo esc_js(__('Request failed. Please try again.', 'wc-tier-package-prices')); ?>');
                        })
                        .always(hideSpinner);
                });
            });
            </script>
            <?php
        }
    }
}