<?php
/**
 * Operacions de contingut sol·licitades per Abency a través del plugin.
 *
 * El plugin corre dins de WordPress, així que crea/edita contingut directament
 * (wp_insert_post / wp_update_post) sense necessitat d'Application Passwords ni de
 * la capçalera Authorization. "Mai toca el viu": create força esborrany i update
 * només toca esborranys (un post publicat es rebutja; l'edició de publicats va pel
 * flux de propostes).
 *
 * @package Abency\Connector
 */

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

class Abency_Content {

    /**
     * Mapeja el "type" d'Abency (posts|pages) al post_type de WP.
     */
    private static function post_type($type) {
        return ('pages' === $type) ? 'page' : 'post';
    }

    /**
     * Autor per defecte del contingut creat pel plugin (definit al pairing).
     */
    private static function author_id() {
        $id = (int) Abency_Settings::get(Abency_Settings::OPT_AUTHOR_ID);
        if ($id > 0) {
            return $id;
        }

        $admins = get_users(array('role' => 'administrator', 'number' => 1, 'fields' => 'ID'));

        return ! empty($admins) ? (int) $admins[0] : 0;
    }

    /**
     * GET /posts
     */
    public static function list_posts(WP_REST_Request $request) {
        $type   = self::post_type($request->get_param('type'));
        $status = $request->get_param('status');
        $status = $status && 'any' !== $status ? sanitize_text_field($status) : 'any';

        $query = new WP_Query(array(
            'post_type'      => $type,
            'post_status'    => $status,
            's'              => (string) $request->get_param('search'),
            'posts_per_page' => min(max((int) $request->get_param('per_page'), 1), 100),
            'paged'          => max((int) $request->get_param('page'), 1),
            'orderby'        => 'modified',
            'order'          => 'DESC',
        ));

        $posts = array();
        foreach ($query->posts as $post) {
            $posts[] = self::summary($post);
        }

        return new WP_REST_Response(array(
            'count' => (int) $query->found_posts,
            'posts' => $posts,
        ), 200);
    }

    /**
     * GET /posts/{id}
     */
    public static function get_post(WP_REST_Request $request) {
        $post = get_post((int) $request['id']);

        if (! $post) {
            return new WP_REST_Response(array('message' => 'Contingut no trobat.'), 404);
        }

        return new WP_REST_Response(self::detail($post), 200);
    }

    /**
     * POST /posts — crea un esborrany (status sempre draft).
     */
    public static function create_post(WP_REST_Request $request) {
        $p = $request->get_json_params();

        if (empty($p['title']) && empty($p['content'])) {
            return new WP_REST_Response(array('message' => 'Cal com a mínim title o content.'), 422);
        }

        $postarr = array(
            'post_type'    => self::post_type($p['type'] ?? 'posts'),
            'post_status'  => 'draft',
            'post_title'   => isset($p['title']) ? wp_kses_post($p['title']) : '',
            'post_content' => isset($p['content']) ? wp_kses_post($p['content']) : '',
            'post_excerpt' => isset($p['excerpt']) ? wp_kses_post($p['excerpt']) : '',
            'post_author'  => self::author_id(),
        );
        if (! empty($p['slug'])) {
            $postarr['post_name'] = sanitize_title($p['slug']);
        }

        $id = wp_insert_post($postarr, true);
        if (is_wp_error($id)) {
            return new WP_REST_Response(array('message' => $id->get_error_message()), 400);
        }

        self::apply_terms($id, $p);
        if (! empty($p['seo']) && is_array($p['seo'])) {
            Abency_Seo::write($id, $p['seo']);
        }

        return new WP_REST_Response(self::detail(get_post($id)), 201);
    }

    /**
     * POST /posts/{id} — actualitza un ESBORRANY. Rebutja si està publicat.
     */
    public static function update_post(WP_REST_Request $request) {
        $post = get_post((int) $request['id']);

        if (! $post) {
            return new WP_REST_Response(array('message' => 'Contingut no trobat.'), 404);
        }

        if ('publish' === $post->post_status) {
            return new WP_REST_Response(array(
                'message' => 'Aquest contingut està publicat: no s\'edita en viu. Usa el flux de propostes.',
            ), 409);
        }

        $p = $request->get_json_params();

        $postarr = array('ID' => $post->ID);
        if (isset($p['title'])) {
            $postarr['post_title'] = wp_kses_post($p['title']);
        }
        if (isset($p['content'])) {
            $postarr['post_content'] = wp_kses_post($p['content']);
        }
        if (isset($p['excerpt'])) {
            $postarr['post_excerpt'] = wp_kses_post($p['excerpt']);
        }
        if (! empty($p['slug'])) {
            $postarr['post_name'] = sanitize_title($p['slug']);
        }

        $result = wp_update_post($postarr, true);
        if (is_wp_error($result)) {
            return new WP_REST_Response(array('message' => $result->get_error_message()), 400);
        }

        self::apply_terms($post->ID, $p);
        if (! empty($p['seo']) && is_array($p['seo'])) {
            Abency_Seo::write($post->ID, $p['seo']);
        }

        return new WP_REST_Response(self::detail(get_post($post->ID)), 200);
    }

    /**
     * GET /terms — categories o etiquetes.
     */
    public static function list_terms(WP_REST_Request $request) {
        $taxonomy = 'tags' === $request->get_param('taxonomy') ? 'post_tag' : 'category';

        $terms = get_terms(array(
            'taxonomy'   => $taxonomy,
            'hide_empty' => false,
            'search'     => (string) $request->get_param('search'),
            'number'     => 100,
        ));

        $out = array();
        if (! is_wp_error($terms)) {
            foreach ($terms as $t) {
                $out[] = array(
                    'id'    => (int) $t->term_id,
                    'name'  => $t->name,
                    'slug'  => $t->slug,
                    'count' => (int) $t->count,
                );
            }
        }

        return new WP_REST_Response(array('terms' => $out), 200);
    }

    // ── Helpers ───────────────────────────────────────────────────────────────

    private static function apply_terms($post_id, array $p) {
        if (! empty($p['categories']) && is_array($p['categories'])) {
            wp_set_post_terms($post_id, array_map('intval', $p['categories']), 'category');
        }
        if (! empty($p['tags']) && is_array($p['tags'])) {
            wp_set_post_terms($post_id, array_map('intval', $p['tags']), 'post_tag');
        }
    }

    private static function summary($post) {
        return array(
            'id'       => (int) $post->ID,
            'title'    => get_the_title($post),
            'status'   => $post->post_status,
            'type'     => ('page' === $post->post_type) ? 'pages' : 'posts',
            'slug'     => $post->post_name,
            'link'     => get_permalink($post),
            'modified' => $post->post_modified_gmt,
            'date'     => $post->post_date_gmt,
        );
    }

    private static function detail($post) {
        $data = self::summary($post);
        $data['content_raw']  = $post->post_content;
        $data['content_html'] = apply_filters('the_content', $post->post_content);
        $data['excerpt']      = $post->post_excerpt;
        $data['categories']   = wp_get_post_categories($post->ID);
        $data['tags']         = wp_get_post_tags($post->ID, array('fields' => 'ids'));
        $data['seo']          = Abency_Seo::read($post->ID);

        return $data;
    }
}