<?php
if ( ! defined( 'ABSPATH' ) ) exit;

class WMW_Ajax {

    public function init() {
        // Admin AJAX
        add_action( 'wp_ajax_wmw_save_wiki',       array( $this, 'save_wiki' ) );
        add_action( 'wp_ajax_wmw_delete_wiki',     array( $this, 'delete_wiki' ) );
        add_action( 'wp_ajax_wmw_save_article',    array( $this, 'save_article' ) );
        add_action( 'wp_ajax_wmw_delete_article',  array( $this, 'delete_article' ) );
        add_action( 'wp_ajax_wmw_reindex',       array( $this, 'reindex' ) );
        add_action( 'wp_ajax_wmw_reorder',         array( $this, 'reorder_articles' ) );

        // Public AJAX
        add_action( 'wp_ajax_wmw_search',        array( $this, 'ajax_search' ) );
        add_action( 'wp_ajax_nopriv_wmw_search', array( $this, 'ajax_search' ) );
        add_action( 'wp_ajax_wmw_track_view',        array( $this, 'track_view' ) );
        add_action( 'wp_ajax_nopriv_wmw_track_view', array( $this, 'track_view' ) );
    }

    private function verify_nonce( $action = 'wmw_admin_nonce' ) {
        if ( ! isset( $_POST['nonce'] ) || ! wp_verify_nonce( $_POST['nonce'], $action ) ) {
            wp_send_json_error( array( 'message' => 'Ungültige Anfrage.' ) );
        }
        if ( ! current_user_can( 'manage_options' ) ) {
            wp_send_json_error( array( 'message' => 'Keine Berechtigung.' ) );
        }
    }

    public function save_wiki() {
        $this->verify_nonce();

        $id    = absint( $_POST['id'] ?? 0 );
        $title = sanitize_text_field( $_POST['title'] ?? '' );
        $desc  = wp_kses_post( $_POST['description'] ?? '' );
        $icon  = sanitize_text_field( $_POST['icon'] ?? '📖' );
        $color = sanitize_hex_color( $_POST['color'] ?? '#2271b1' );
        $ver   = sanitize_text_field( $_POST['version'] ?? '1.0.0' );

        if ( empty( $title ) ) {
            wp_send_json_error( array( 'message' => 'Titel darf nicht leer sein.' ) );
        }

        $data = array(
            'post_type'    => 'wmw_wiki',
            'post_title'   => $title,
            'post_content' => $desc,
            'post_status'  => 'publish',
        );

        if ( $id ) {
            $data['ID'] = $id;
            $result = wp_update_post( $data, true );
        } else {
            $result = wp_insert_post( $data, true );
        }

        if ( is_wp_error( $result ) ) {
            wp_send_json_error( array( 'message' => $result->get_error_message() ) );
        }

        update_post_meta( $result, '_wmw_icon',    $icon );
        update_post_meta( $result, '_wmw_color',   $color );
        update_post_meta( $result, '_wmw_version', $ver );

        wp_send_json_success( array(
            'id'    => $result,
            'title' => $title,
            'url'   => get_permalink( $result ),
        ) );
    }

    public function delete_wiki() {
        $this->verify_nonce();
        $id = absint( $_POST['id'] ?? 0 );
        if ( ! $id ) wp_send_json_error();

        // Delete all articles in this wiki
        $articles = wmw_get_articles( $id );
        foreach ( $articles as $article ) {
            wp_delete_post( $article->ID, true );
        }

        wp_delete_post( $id, true );
        wp_send_json_success();
    }

    public function save_article() {
        $this->verify_nonce();

        $id      = absint( $_POST['id'] ?? 0 );
        $title   = sanitize_text_field( $_POST['title'] ?? '' );
        $content = wp_kses_post( $_POST['content'] ?? '' );
        $excerpt = sanitize_textarea_field( $_POST['excerpt'] ?? '' );
        $wiki_id = absint( $_POST['wiki_id'] ?? 0 );
        $order   = absint( $_POST['order'] ?? 0 );
        $cats    = array_map( 'absint', (array) ( $_POST['categories'] ?? array() ) );
        $tags    = sanitize_text_field( $_POST['tags'] ?? '' );
        $status  = in_array( $_POST['status'] ?? 'publish', array( 'publish', 'draft' ) ) ? $_POST['status'] : 'publish';

        if ( empty( $title ) ) {
            wp_send_json_error( array( 'message' => 'Titel darf nicht leer sein.' ) );
        }

        $data = array(
            'post_type'    => 'wmw_article',
            'post_title'   => $title,
            'post_content' => $content,
            'post_excerpt' => $excerpt,
            'post_status'  => $status,
        );

        if ( $id ) {
            $data['ID'] = $id;
            $result = wp_update_post( $data, true );
        } else {
            $result = wp_insert_post( $data, true );
        }

        if ( is_wp_error( $result ) ) {
            wp_send_json_error( array( 'message' => $result->get_error_message() ) );
        }

        update_post_meta( $result, '_wmw_wiki_id', $wiki_id );
        update_post_meta( $result, '_wmw_order',   $order );

        if ( ! empty( $cats ) ) {
            wp_set_object_terms( $result, $cats, 'wmw_category' );
        }
        if ( ! empty( $tags ) ) {
            $tag_arr = array_map( 'trim', explode( ',', $tags ) );
            wp_set_object_terms( $result, $tag_arr, 'wmw_tag' );
        }

        wp_send_json_success( array(
            'id'    => $result,
            'title' => $title,
            'url'   => get_permalink( $result ),
        ) );
    }

    public function delete_article() {
        $this->verify_nonce();
        $id = absint( $_POST['id'] ?? 0 );
        if ( ! $id ) wp_send_json_error();
        wp_delete_post( $id, true );
        wp_send_json_success();
    }

    public function reorder_articles() {
        $this->verify_nonce();
        $order = (array) ( $_POST['order'] ?? array() );
        foreach ( $order as $position => $article_id ) {
            update_post_meta( absint( $article_id ), '_wmw_order', absint( $position ) );
        }
        wp_send_json_success();
    }

    public function ajax_search() {
        $query   = sanitize_text_field( $_POST['query'] ?? $_GET['query'] ?? '' );
        $wiki_id = absint( $_POST['wiki_id'] ?? $_GET['wiki_id'] ?? 0 );

        if ( strlen( $query ) < 2 ) {
            wp_send_json_success( array( 'results' => array(), 'count' => 0 ) );
        }

        $results = WMW_Search::search( $query, $wiki_id );
        $output  = array();

        foreach ( $results as $post ) {
            $wiki    = wmw_get_article_wiki( $post->ID );
            $output[] = array(
                'id'      => $post->ID,
                'title'   => $post->wmw_title,
                'excerpt' => $post->wmw_excerpt,
                'url'     => get_permalink( $post->ID ),
                'wiki'    => $wiki ? $wiki->post_title : '',
                'icon'    => $wiki ? wmw_get_wiki_icon( $wiki->ID ) : '📄',
            );
        }

        wp_send_json_success( array( 'results' => $output, 'count' => count( $output ) ) );
    }

    public function reindex() {
        $this->verify_nonce();
        $count = WMW_Search::reindex_all();
        wp_send_json_success( array( 'count' => $count, 'message' => $count . ' Artikel neu indiziert.' ) );
    }

    public function track_view() {
        global $wpdb;
        $article_id = absint( $_POST['article_id'] ?? 0 );
        if ( ! $article_id ) wp_send_json_error();

        $table = $wpdb->prefix . 'wmw_views';
        $existing = $wpdb->get_var( $wpdb->prepare( "SELECT id FROM $table WHERE article_id = %d", $article_id ) );

        if ( $existing ) {
            $wpdb->query( $wpdb->prepare( "UPDATE $table SET view_count = view_count + 1 WHERE article_id = %d", $article_id ) );
        } else {
            $wpdb->insert( $table, array( 'article_id' => $article_id, 'view_count' => 1 ), array( '%d', '%d' ) );
        }

        wp_send_json_success();
    }
}