<?php

namespace DaftPlug\Rankify\Features\Editor;

use DaftPlug\Rankify\Features\Meta\Context;
use DaftPlug\Rankify\Features\Meta\Resolver;
use DaftPlug\Rankify\Features\Meta\Variables;

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

/**
 * SEO overrides on term and author edit screens.
 *
 * `Resolver::override()` has read term meta and user meta since Phase 1 — a
 * category archive with a written description was already supported, there was
 * simply no way to write one. These are the two missing forms.
 *
 * Reuses PostMeta's field list and sanitizer rather than defining its own: a
 * term override and a post override are the same value stored against a
 * different object, and two field lists would drift.
 */
class TermMeta
{
  const NONCE_ACTION = 'rankify_save_term_meta';
  const NONCE_NAME = 'rankify_term_meta_nonce';

  /**
   * Only the fields that mean something for an archive. Focus keywords and the
   * social image are per-page editorial decisions that do not apply to a
   * generated listing page.
   */
  const FIELDS = ['title', 'description', 'canonical', 'noindex', 'nofollow'];

  public function __construct()
  {
    foreach (get_taxonomies(['public' => true], 'names') as $taxonomy) {
      add_action("{$taxonomy}_edit_form_fields", [$this, 'renderTermFields'], 10, 2);
      add_action("edited_{$taxonomy}", [$this, 'saveTerm']);
      // No add_form_fields hook: a term being created has no ID yet, and the
      // SEO fields are far more useful once there is content to describe.
    }

    add_action('show_user_profile', [$this, 'renderUserFields']);
    add_action('edit_user_profile', [$this, 'renderUserFields']);
    add_action('personal_options_update', [$this, 'saveUser']);
    add_action('edit_user_profile_update', [$this, 'saveUser']);
  }

  // ────────────────────────────────────────────────────────────
  // Terms
  // ────────────────────────────────────────────────────────────

  public function renderTermFields($term, $taxonomy = '')
  {
    if (!($term instanceof \WP_Term)) {
      return;
    }

    $context = new Context();
    $context->type = Context::TYPE_TAXONOMY;
    $context->object = $term;
    $context->objectId = (int) $term->term_id;
    $context->taxonomy = $term->taxonomy;
    $context->settingsKey = 'tax_' . $term->taxonomy;

    $values = [];
    foreach (self::FIELDS as $field) {
      $stored = get_term_meta($term->term_id, PostMeta::metaKey($field), true);
      $values[$field] = is_string($stored) ? $stored : '';
    }

    $inheritedTitle = Variables::resolve(Resolver::template($context, 'title'), $context);
    $inheritedDescription = Variables::resolve(Resolver::template($context, 'description'), $context);

    wp_nonce_field(self::NONCE_ACTION, self::NONCE_NAME);
    $this->renderRows($values, $inheritedTitle, $inheritedDescription, get_term_link($term));
  }

  public function saveTerm($termId)
  {
    if (!isset($_POST[self::NONCE_NAME]) || !wp_verify_nonce(sanitize_text_field(wp_unslash($_POST[self::NONCE_NAME])), self::NONCE_ACTION)) {
      return;
    }

    if (!current_user_can('manage_categories')) {
      return;
    }

    // phpcs:ignore WordPress.Security.NonceVerification.Missing -- Verified above.
    $submitted = isset($_POST['rankify']) && is_array($_POST['rankify']) ? wp_unslash($_POST['rankify']) : [];

    foreach (self::FIELDS as $field) {
      $raw = array_key_exists($field, $submitted) ? $submitted[$field] : '';
      $value = PostMeta::sanitize($field, $raw);

      // Delete rather than store '' — Resolver reads a missing key as "fall
      // back to the template", and an empty string would be indistinguishable
      // from a deliberate blank.
      if ('' === $value) {
        delete_term_meta((int) $termId, PostMeta::metaKey($field));
        continue;
      }

      update_term_meta((int) $termId, PostMeta::metaKey($field), $value);
    }
  }

  // ────────────────────────────────────────────────────────────
  // Authors
  // ────────────────────────────────────────────────────────────

  public function renderUserFields($user)
  {
    if (!($user instanceof \WP_User) || !current_user_can('edit_user', $user->ID)) {
      return;
    }

    $context = new Context();
    $context->type = Context::TYPE_AUTHOR;
    $context->object = $user;
    $context->objectId = (int) $user->ID;
    $context->settingsKey = 'author';

    $values = [];
    foreach (self::FIELDS as $field) {
      $stored = get_user_meta($user->ID, PostMeta::metaKey($field), true);
      $values[$field] = is_string($stored) ? $stored : '';
    }

    $inheritedTitle = Variables::resolve(Resolver::template($context, 'title'), $context);
    $inheritedDescription = Variables::resolve(Resolver::template($context, 'description'), $context);
    ?>
    <h2><?php esc_html_e('Crownify SEO', 'crownify'); ?></h2>
    <p class="description"><?php esc_html_e('How this author’s archive page appears in search results.', 'crownify'); ?></p>
    <table class="form-table" role="presentation">
      <?php
      wp_nonce_field(self::NONCE_ACTION, self::NONCE_NAME);
      $this->renderRows($values, $inheritedTitle, $inheritedDescription, get_author_posts_url($user->ID));?>
    </table>
    <?php
  }

  public function saveUser($userId)
  {
    if (!isset($_POST[self::NONCE_NAME]) || !wp_verify_nonce(sanitize_text_field(wp_unslash($_POST[self::NONCE_NAME])), self::NONCE_ACTION)) {
      return;
    }

    if (!current_user_can('edit_user', $userId)) {
      return;
    }

    // phpcs:ignore WordPress.Security.NonceVerification.Missing -- Verified above.
    $submitted = isset($_POST['rankify']) && is_array($_POST['rankify']) ? wp_unslash($_POST['rankify']) : [];

    foreach (self::FIELDS as $field) {
      $raw = array_key_exists($field, $submitted) ? $submitted[$field] : '';
      $value = PostMeta::sanitize($field, $raw);

      if ('' === $value) {
        delete_user_meta((int) $userId, PostMeta::metaKey($field));
        continue;
      }

      update_user_meta((int) $userId, PostMeta::metaKey($field), $value);
    }
  }

  // ────────────────────────────────────────────────────────────
  // Shared markup
  // ────────────────────────────────────────────────────────────

  /**
   * Both screens are core's own `form-table` layout, so these are plain rows
   * with no styling of our own — a custom-styled panel dropped into the middle
   * of the term edit screen looks like a different plugin.
   */
  protected function renderRows(array $values, $inheritedTitle, $inheritedDescription, $permalink)
  {
    $permalink = is_wp_error($permalink) ? '' : (string) $permalink; ?>
    <tr class="form-field">
      <th scope="row"><label for="rankifyTermTitle"><?php esc_html_e('SEO Title', 'crownify'); ?></label></th>
      <td>
        <input type="text" id="rankifyTermTitle" name="rankify[title]" value="<?php echo esc_attr($values['title']); ?>" placeholder="<?php echo esc_attr($inheritedTitle); ?>" class="regular-text" autocomplete="off">
        <p class="description"><?php esc_html_e('Leave blank to use the template. %%variables%% work here.', 'crownify'); ?></p>
      </td>
    </tr>
    <tr class="form-field">
      <th scope="row"><label for="rankifyTermDescription"><?php esc_html_e('Meta Description', 'crownify'); ?></label></th>
      <td>
        <textarea id="rankifyTermDescription" name="rankify[description]" rows="3" class="large-text" placeholder="<?php echo esc_attr($inheritedDescription); ?>"><?php echo esc_textarea($values['description']); ?></textarea>
        <p class="description"><?php esc_html_e('Write it so it reads on its own. That is how an AI assistant will quote it.', 'crownify'); ?></p>
      </td>
    </tr>
    <tr class="form-field">
      <th scope="row"><label for="rankifyTermCanonical"><?php esc_html_e('Canonical URL', 'crownify'); ?></label></th>
      <td>
        <input type="url" id="rankifyTermCanonical" name="rankify[canonical]" value="<?php echo esc_attr($values['canonical']); ?>" placeholder="<?php echo esc_attr($permalink); ?>" class="regular-text" autocomplete="off">
      </td>
    </tr>
    <tr class="form-field">
      <th scope="row"><?php esc_html_e('Search Engines', 'crownify'); ?></th>
      <td>
        <label for="rankifyTermNoindex">
          <input type="checkbox" id="rankifyTermNoindex" name="rankify[noindex]" value="on" <?php checked($values['noindex'], 'on'); ?>>
          <?php esc_html_e('Keep this page out of search results (noindex)', 'crownify'); ?>
        </label>
        <br>
        <label for="rankifyTermNofollow">
          <input type="checkbox" id="rankifyTermNofollow" name="rankify[nofollow]" value="on" <?php checked($values['nofollow'], 'on'); ?>>
          <?php esc_html_e('Do not follow links on this page (nofollow)', 'crownify'); ?>
        </label>
      </td>
    </tr>
    <?php
  }
}