<?php

namespace AskTamMCP\Tools;

defined('ABSPATH') || exit;

class PostTools {

    public static function listPosts(array $args): array {
        $queryArgs = [
            'post_type'      => $args['post_type'] ?? 'post',
            'post_status'    => $args['status'] ?? 'publish',
            'posts_per_page' => min((int) ($args['per_page'] ?? 20), 100),
            'paged'          => (int) ($args['page'] ?? 1),
            'orderby'        => $args['orderby'] ?? 'date',
            'order'          => $args['order'] ?? 'DESC',
        ];

        if (!empty($args['search']))      $queryArgs['s']           = $args['search'];
        if (!empty($args['author']))      $queryArgs['author']      = (int) $args['author'];
        if (!empty($args['category_id'])) $queryArgs['cat']         = (int) $args['category_id'];
        if (!empty($args['tag_id']))      $queryArgs['tag_id']      = (int) $args['tag_id'];
        if (!empty($args['after']))       $queryArgs['date_query'][]= ['after' => $args['after'], 'inclusive' => true];
        if (!empty($args['before']))      $queryArgs['date_query'][]= ['before' => $args['before'], 'inclusive' => true];

        $query = new \WP_Query($queryArgs);
        $posts = [];

        foreach ($query->posts as $post) {
            $posts[] = [
                'id'     => $post->ID,
                'title'  => $post->post_title,
                'status' => $post->post_status,
                'date'   => $post->post_date,
                'author' => (int) $post->post_author,
                'link'   => get_permalink($post->ID),
                'slug'   => $post->post_name,
            ];
        }

        return [
            'posts' => $posts,
            'total' => $query->found_posts,
            'pages' => $query->max_num_pages,
        ];
    }

    public static function getPost(array $args): array {
        $post = get_post((int) $args['post_id']);
        if (!$post) {
            throw new \RuntimeException("Post not found: {$args['post_id']}");
        }

        $categories = wp_get_post_categories($post->ID, ['fields' => 'all']);
        $tags       = wp_get_post_tags($post->ID);
        $meta       = get_post_meta($post->ID);
        $thumbnail  = get_the_post_thumbnail_url($post->ID, 'full');

        return [
            'id'             => $post->ID,
            'title'          => $post->post_title,
            'content'        => $post->post_content,
            'excerpt'        => $post->post_excerpt,
            'status'         => $post->post_status,
            'date'           => $post->post_date,
            'modified'       => $post->post_modified,
            'author'         => (int) $post->post_author,
            'slug'           => $post->post_name,
            'link'           => get_permalink($post->ID),
            'featured_image' => $thumbnail ?: null,
            'categories'     => array_map(fn($c) => ['id' => $c->term_id, 'name' => $c->name, 'slug' => $c->slug], $categories),
            'tags'           => array_map(fn($t) => ['id' => $t->term_id, 'name' => $t->name, 'slug' => $t->slug], $tags),
            'meta'           => array_map(fn($v) => count($v) === 1 ? $v[0] : $v, $meta),
        ];
    }

    public static function createPost(array $args): array {
        $postData = [
            'post_title'   => $args['title'],
            'post_content' => $args['content'] ?? '',
            'post_excerpt' => $args['excerpt'] ?? '',
            'post_status'  => $args['status'] ?? 'draft',
            'post_author'  => $args['author'] ?? get_current_user_id() ?: 1,
            'post_name'    => $args['slug'] ?? '',
            'post_type'    => $args['post_type'] ?? 'post',
        ];

        $postId = wp_insert_post($postData, true);
        if (is_wp_error($postId)) {
            throw new \RuntimeException($postId->get_error_message());
        }

        if (!empty($args['categories'])) wp_set_post_categories($postId, array_map('intval', $args['categories']));
        if (!empty($args['tags']))       wp_set_post_tags($postId, array_map('intval', $args['tags']));
        if (!empty($args['meta']))       foreach ($args['meta'] as $k => $v) update_post_meta($postId, $k, $v);
        if (!empty($args['featured_media'])) set_post_thumbnail($postId, (int) $args['featured_media']);

        return ['id' => $postId, 'link' => get_permalink($postId), 'status' => $args['status'] ?? 'draft'];
    }

    public static function updatePost(array $args): array {
        $postId = (int) $args['post_id'];
        if (!get_post($postId)) {
            throw new \RuntimeException("Post not found: {$postId}");
        }

        $postData = ['ID' => $postId];
        if (isset($args['title']))   $postData['post_title']   = $args['title'];
        if (isset($args['content'])) $postData['post_content'] = $args['content'];
        if (isset($args['excerpt'])) $postData['post_excerpt'] = $args['excerpt'];
        if (isset($args['status']))  $postData['post_status']  = $args['status'];
        if (isset($args['slug']))    $postData['post_name']    = $args['slug'];

        $result = wp_update_post($postData, true);
        if (is_wp_error($result)) {
            throw new \RuntimeException($result->get_error_message());
        }

        if (!empty($args['categories'])) wp_set_post_categories($postId, array_map('intval', $args['categories']));
        if (!empty($args['tags']))       wp_set_post_tags($postId, array_map('intval', $args['tags']));
        if (!empty($args['meta']))       foreach ($args['meta'] as $k => $v) update_post_meta($postId, $k, $v);
        if (!empty($args['featured_media'])) set_post_thumbnail($postId, (int) $args['featured_media']);

        return ['id' => $postId, 'updated' => true, 'link' => get_permalink($postId)];
    }

    public static function deletePost(array $args): array {
        $postId = (int) $args['post_id'];
        $force  = (bool) ($args['force'] ?? false);
        $result = wp_delete_post($postId, $force);

        if (!$result) {
            throw new \RuntimeException("Failed to delete post: {$postId}");
        }

        return ['id' => $postId, 'deleted' => true, 'permanent' => $force];
    }
}