<?php
/**
 * Plugin coordinator.
 *
 * @package 7sky-internal-post-linker
 */

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

/**
 * Wires WordPress editor hooks to focused plugin services.
 */
final class skyinpo_Internal_Post_Linker {
    /**
     * REST namespace.
     *
     * @var string
     */
    private $namespace = 'skyinpo-internal-post-linker/v1';

    /**
     * Content search service.
     *
     * @var skyinpo_Content_Search
     */
    private $content_search;

    /**
     * Suggestion service.
     *
     * @var skyinpo_Link_Suggestions
     */
    private $link_suggestions;

    /**
     * Constructor.
     */
    private function __construct() {
        $this->content_search = new skyinpo_Content_Search();
        $this->link_suggestions = new skyinpo_Link_Suggestions($this->content_search, new skyinpo_Keyword_Matcher());
    }

    /**
     * Boot the plugin.
     */
    public static function init() {
        $plugin = new self();
        add_action('enqueue_block_editor_assets', array($plugin, 'enqueue_block_editor_assets'));
        add_action('admin_enqueue_scripts', array($plugin, 'enqueue_classic_editor_assets'));
        add_action('rest_api_init', array($plugin, 'register_rest_routes'));
        add_action('wp_ajax_skyinpo_search_posts', array($plugin, 'ajax_search_posts'));
        add_action('wp_ajax_skyinpo_suggest_links', array($plugin, 'ajax_suggest_links'));
        add_action('post_submitbox_misc_actions', array($plugin, 'render_classic_suggestion_button'));
        add_filter('mce_external_plugins', array($plugin, 'register_tinymce_plugin'));
        add_filter('mce_buttons', array($plugin, 'register_tinymce_button'));
    }

    /**
     * Add the inline editor search/link tool.
     */
    public function enqueue_block_editor_assets() {
        $asset_path = SKYINPO_PLUGIN_PATH . 'assets/js/editor.js';
        $style_path = SKYINPO_PLUGIN_PATH . 'assets/css/editor.css';

        wp_enqueue_script(
            'skyinpo-internal-post-linker-editor',
            SKYINPO_PLUGIN_URL . 'assets/js/editor.js',
            array(
                'wp-block-editor',
                'wp-components',
                'wp-compose',
                'wp-editor',
                'wp-element',
                'wp-html-entities',
                'wp-i18n',
                'wp-rich-text',
                'wp-url',
                'wp-data',
                'wp-plugins',
                'wp-edit-post',
            ),
            file_exists($asset_path) ? filemtime($asset_path) : SKYINPO_VERSION,
            true
        );

        wp_enqueue_style(
            'skyinpo-internal-post-linker-editor',
            SKYINPO_PLUGIN_URL . 'assets/css/editor.css',
            array('wp-components'),
            file_exists($style_path) ? filemtime($style_path) : SKYINPO_VERSION
        );

        wp_localize_script(
            'skyinpo-internal-post-linker-editor',
            'skyinpo_InternalPostLinker',
            $this->get_editor_settings()
        );
    }

    /**
     * Add Classic Editor assets on post editing screens.
     *
     * @param string $hook Current admin hook.
     */
    public function enqueue_classic_editor_assets($hook) {
        if (!in_array($hook, array('post.php', 'post-new.php'), true)) {
            return;
        }

        $script_path = SKYINPO_PLUGIN_PATH . 'assets/js/classic-editor.js';
        $style_path = SKYINPO_PLUGIN_PATH . 'assets/css/classic-editor.css';

        wp_register_script(
            'skyinpo-internal-post-linker-classic-editor',
            SKYINPO_PLUGIN_URL . 'assets/js/classic-editor.js',
            array(),
            file_exists($script_path) ? filemtime($script_path) : SKYINPO_VERSION,
            false
        );

        wp_add_inline_script(
            'skyinpo-internal-post-linker-classic-editor',
            'window.skyinpo_InternalPostLinkerClassic = ' . wp_json_encode($this->get_editor_settings()) . ';',
            'before'
        );

        wp_enqueue_script('skyinpo-internal-post-linker-classic-editor');

        wp_enqueue_style(
            'skyinpo-internal-post-linker-classic-editor',
            SKYINPO_PLUGIN_URL . 'assets/css/classic-editor.css',
            array(),
            file_exists($style_path) ? filemtime($style_path) : SKYINPO_VERSION
        );
    }

    /**
     * Register the TinyMCE plugin script.
     *
     * @param array<string, string> $plugins TinyMCE plugins.
     * @return array<string, string>
     */
    public function register_tinymce_plugin($plugins) {
        if (!current_user_can('edit_posts') && !current_user_can('edit_pages')) {
            return $plugins;
        }

        $plugins['skyinpo_internal_post_linker'] = SKYINPO_PLUGIN_URL . 'assets/js/classic-editor.js';
        return $plugins;
    }

    /**
     * Register the TinyMCE toolbar button.
     *
     * @param string[] $buttons TinyMCE buttons.
     * @return string[]
     */
    public function register_tinymce_button($buttons) {
        if (!current_user_can('edit_posts') && !current_user_can('edit_pages')) {
            return $buttons;
        }

        $link_position = array_search('link', $buttons, true);
        if (false === $link_position) {
            $buttons[] = 'skyinpo_internal_post_linker';
            return $buttons;
        }

        array_splice($buttons, $link_position + 1, 0, 'skyinpo_internal_post_linker');
        return $buttons;
    }

    /**
     * Register REST routes used by the editor UI.
     */
    public function register_rest_routes() {
        register_rest_route(
            $this->namespace,
            '/search',
            array(
                'methods' => WP_REST_Server::READABLE,
                'callback' => array($this, 'search_posts'),
                'permission_callback' => array($this, 'can_search_posts'),
                'args' => array(
                    'term' => array(
                        'type' => 'string',
                        'sanitize_callback' => 'sanitize_text_field',
                        'default' => '',
                    ),
                    'post_id' => array(
                        'type' => 'integer',
                        'sanitize_callback' => 'absint',
                        'default' => 0,
                    ),
                ),
            )
        );
    }

    /**
     * Confirm the current user can use the post editor.
     *
     * @return bool
     */
    public function can_search_posts() {
        return current_user_can('edit_posts');
    }

    /**
     * Search linkable posts over admin-ajax for editor requests.
     */
    public function ajax_search_posts() {
        check_ajax_referer('skyinpo_search_posts', 'nonce');

        if (!$this->can_search_posts()) {
            wp_send_json_error(
                array('message' => __('You are not allowed to search posts.', '7sky-internal-post-linker')),
                403
            );
        }

        $results = $this->content_search->get_search_results(
            isset($_GET['term']) ? sanitize_text_field(wp_unslash($_GET['term'])) : '',
            isset($_GET['post_id']) ? absint(wp_unslash($_GET['post_id'])) : 0
        );

        wp_send_json_success($results);
    }

    /**
     * Suggest internal links for the current editor content.
     */
    public function ajax_suggest_links() {
        check_ajax_referer('skyinpo_suggest_links', 'nonce');

        if (!$this->can_search_posts()) {
            wp_send_json_error(
                array('message' => __('You are not allowed to scan posts.', '7sky-internal-post-linker')),
                403
            );
        }

        $content = isset($_POST['content']) ? wp_kses_post(wp_unslash((string) $_POST['content'])) : '';
        $current_post_id = isset($_POST['post_id']) ? absint(wp_unslash($_POST['post_id'])) : 0;

        wp_send_json_success($this->link_suggestions->get_link_suggestions($content, $current_post_id));
    }

    /**
     * Render a Classic Editor publish-box entry for link suggestions.
     */
    public function render_classic_suggestion_button() {
        if (!$this->can_search_posts()) {
            return;
        }

        printf(
            '<div class="misc-pub-section skyinpo-classic-suggest-action"><button type="button" class="button" id="skyinpo-classic-suggest-links">%s</button></div>',
            esc_html__('Suggest internal links', '7sky-internal-post-linker')
        );
    }

    /**
     * Search linkable internal content.
     *
     * @param WP_REST_Request $request Request object.
     * @return WP_REST_Response
     */
    public function search_posts(WP_REST_Request $request) {
        $term = trim((string) $request->get_param('term'));
        $current_post_id = absint($request->get_param('post_id'));

        return rest_ensure_response($this->content_search->get_search_results($term, $current_post_id));
    }

    /**
     * Return shared editor settings.
     *
     * @return array<string, mixed>
     */
    private function get_editor_settings() {
        return array(
            'searchPath' => '/' . $this->namespace . '/search',
            'ajaxUrl' => admin_url('admin-ajax.php'),
            'nonce' => wp_create_nonce('skyinpo_search_posts'),
            'suggestNonce' => wp_create_nonce('skyinpo_suggest_links'),
            'currentPostId' => get_the_ID() ? absint(get_the_ID()) : 0,
            'minSearchLength' => 2,
            'searchTimeoutMs' => 8000,
            'suggestionLimit' => 20,
        );
    }
}