<?php
/**
 * 招新文章标记：ACF “招新文章标记” 字段组、is_recruitment_article 判定、
 * 编辑页 meta box、以及“加入我们”页顶部招新新闻 feed。
 * 抽离自主题 functions.php（lift-and-shift，逻辑未改）。
 */

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

function itstudio_register_acf_fields() {
    if (!function_exists('acf_add_local_field_group')) {
        return;
    }

    acf_add_local_field_group(array(
        'key' => 'group_itstudio_recruitment_article',
        'title' => '招新文章标记',
        'fields' => array(
            array(
                'key' => 'field_itstudio_is_recruitment_article',
                'label' => '是否为招新文章',
                'name' => 'itstudio_is_recruitment_article',
                'type' => 'true_false',
                'instructions' => '勾选后，该文章会在“加入我们”页面顶部新闻条中显示（按发布时间排序）。',
                'required' => 0,
                'default_value' => 0,
                'ui' => 1,
                'ui_on_text' => '是',
                'ui_off_text' => '否',
            ),
        ),
        'location' => array(
            array(
                array(
                    'param' => 'post_type',
                    'operator' => '==',
                    'value' => 'announcement',
                ),
            ),
            array(
                array(
                    'param' => 'post_type',
                    'operator' => '==',
                    'value' => 'news',
                ),
            ),
            array(
                array(
                    'param' => 'post_type',
                    'operator' => '==',
                    'value' => 'post',
                ),
            ),
        ),
        'position' => 'side',
        'style' => 'default',
        'active' => true,
        'show_in_rest' => 1,
    ));
}
add_action('acf/init', 'itstudio_register_acf_fields');

function itstudio_get_recruitment_article_meta_key() {
    return 'itstudio_is_recruitment_article';
}

function itstudio_normalize_recruitment_flag($value) {
    if (is_bool($value)) {
        return $value;
    }

    if (is_numeric($value)) {
        return ((int) $value) > 0;
    }

    $value = strtolower(trim((string) $value));
    return in_array($value, array('1', 'true', 'yes', 'on', 'y'), true);
}

function itstudio_is_recruitment_article($post_id) {
    $post_id = (int) $post_id;
    if ($post_id <= 0) {
        return false;
    }

    $meta_key = itstudio_get_recruitment_article_meta_key();
    $meta_keys = array(
        $meta_key,
        '_itstudio_is_recruitment_article',
        'itstudio_join_article',
        'join_recruitment_article',
        'is_recruitment_article',
    );

    foreach ($meta_keys as $key) {
        $raw = get_post_meta($post_id, $key, true);
        if ($raw !== '' && $raw !== null && itstudio_normalize_recruitment_flag($raw)) {
            return true;
        }
    }

    if (function_exists('get_field')) {
        $acf_keys = array(
            'itstudio_is_recruitment_article',
            'is_recruitment_article',
            'itstudio_join_article',
        );
        foreach ($acf_keys as $acf_key) {
            $raw = get_field($acf_key, $post_id, false);
            if ($raw !== '' && $raw !== null && itstudio_normalize_recruitment_flag($raw)) {
                return true;
            }
        }
    }

    return false;
}

function itstudio_add_recruitment_meta_boxes() {
    $screens = array('announcement', 'news', 'post');
    foreach ($screens as $screen) {
        add_meta_box(
            'itstudio_recruitment_flag',
            __('招新文章', 'itstudio'),
            'itstudio_render_recruitment_meta_box',
            $screen,
            'side',
            'high'
        );
    }
}
add_action('add_meta_boxes', 'itstudio_add_recruitment_meta_boxes');

function itstudio_render_recruitment_meta_box($post) {
    $meta_key = itstudio_get_recruitment_article_meta_key();
    $checked = itstudio_is_recruitment_article((int) $post->ID);
    wp_nonce_field('itstudio_save_recruitment_meta', 'itstudio_recruitment_meta_nonce');
    ?>
    <p>
        <label for="itstudio_is_recruitment_article">
            <input
                type="checkbox"
                id="itstudio_is_recruitment_article"
                name="itstudio_is_recruitment_article"
                value="1"
                <?php checked($checked); ?>
            >
            <?php esc_html_e('在加入我们页面显示为招新新闻', 'itstudio'); ?>
        </label>
    </p>
    <p style="color:#666;line-height:1.5;margin:0;">
        <?php esc_html_e('仅显示当年且已发布的招新文章，最多展示 5 篇。', 'itstudio'); ?>
    </p>
    <input type="hidden" name="itstudio_recruitment_meta_key" value="<?php echo esc_attr($meta_key); ?>">
    <?php
}

function itstudio_save_recruitment_meta_box($post_id) {
    if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
        return;
    }
    if (wp_is_post_revision($post_id) || wp_is_post_autosave($post_id)) {
        return;
    }
    if (!isset($_POST['itstudio_recruitment_meta_nonce'])) {
        return;
    }

    $nonce = sanitize_text_field(wp_unslash($_POST['itstudio_recruitment_meta_nonce']));
    if (!wp_verify_nonce($nonce, 'itstudio_save_recruitment_meta')) {
        return;
    }

    $post_type = get_post_type($post_id);
    if (!in_array($post_type, array('announcement', 'news', 'post'), true)) {
        return;
    }

    if (!current_user_can('edit_post', $post_id)) {
        return;
    }

    $meta_key = itstudio_get_recruitment_article_meta_key();
    $checked = isset($_POST['itstudio_is_recruitment_article'])
        ? sanitize_text_field(wp_unslash($_POST['itstudio_is_recruitment_article']))
        : '';
    if (itstudio_normalize_recruitment_flag($checked)) {
        update_post_meta($post_id, $meta_key, '1');
    } else {
        delete_post_meta($post_id, $meta_key);
    }
}
add_action('save_post', 'itstudio_save_recruitment_meta_box');

function itstudio_join_get_recruitment_feed_items($join_runtime = array(), $limit = 5) {
    $limit = max(1, min(10, (int) $limit));
    $join_runtime = is_array($join_runtime) ? $join_runtime : array();

    $now = new DateTimeImmutable('now', wp_timezone());
    $now_year = (int) $now->format('Y');
    $display_year = isset($join_runtime['recruitment_year']) && is_numeric($join_runtime['recruitment_year'])
        ? (int) $join_runtime['recruitment_year']
        : $now_year;

    $season_start_ts = null;
    $season_end_ts = null;
    $stages = isset($join_runtime['stages']) && is_array($join_runtime['stages']) ? $join_runtime['stages'] : array();
    foreach ($stages as $stage) {
        if (!is_array($stage)) {
            continue;
        }
        $start_ts = isset($stage['start_ts']) && is_numeric($stage['start_ts']) ? (int) $stage['start_ts'] : null;
        $end_ts = isset($stage['end_ts']) && is_numeric($stage['end_ts']) ? (int) $stage['end_ts'] : null;
        if ($start_ts !== null && ($season_start_ts === null || $start_ts < $season_start_ts)) {
            $season_start_ts = $start_ts;
        }
        if ($end_ts !== null && ($season_end_ts === null || $end_ts > $season_end_ts)) {
            $season_end_ts = $end_ts;
        }
    }

    $now_ts = (int) (isset($join_runtime['now_ts']) && is_numeric($join_runtime['now_ts']) ? $join_runtime['now_ts'] : ((int) $now->format('U') * 1000));
    if ($season_start_ts !== null && $now_ts < $season_start_ts && $display_year > $now_year) {
        // 下年招新未开始：继续展示本年招新资讯
        $display_year = $now_year;
    }

    $query = new WP_Query(array(
        'post_type' => array('announcement', 'news', 'post'),
        'post_status' => 'publish',
        'posts_per_page' => 80,
        'orderby' => 'date',
        'order' => 'DESC',
        'no_found_rows' => true,
        'ignore_sticky_posts' => true,
        'date_query' => array(
            array(
                'year' => $display_year,
            ),
        ),
    ));

    $items = array();
    if ($query->have_posts()) {
        foreach ($query->posts as $post) {
            if (count($items) >= $limit) {
                break;
            }

            $post_id = (int) $post->ID;
            if (!itstudio_is_recruitment_article($post_id)) {
                continue;
            }

            $title = trim((string) get_the_title($post_id));
            $url = (string) get_permalink($post_id);
            if ($title === '' || $url === '') {
                continue;
            }

            $excerpt = function_exists('itstudio_get_post_excerpt_chars')
                ? itstudio_get_post_excerpt_chars($post_id, 72)
                : wp_html_excerpt(trim(wp_strip_all_tags((string) get_post_field('post_excerpt', $post_id))), 72, '...');

            if ($excerpt === '') {
                $excerpt = '...';
            }

            $author_id = (int) get_post_field('post_author', $post_id);
            $author = trim((string) get_the_author_meta('display_name', $author_id));
            if ($author === '') {
                $author = 'Unknown';
            }

            $items[] = array(
                'id' => $post_id,
                'title' => $title,
                'excerpt' => $excerpt,
                'url' => $url,
                'date' => get_the_date('Y-m-d H:i', $post_id),
                'date_iso' => get_the_date('c', $post_id),
                'author' => $author,
                'type' => get_post_type($post_id),
            );
        }
    }
    wp_reset_postdata();

    return array(
        'display_year' => $display_year,
        'items' => $items,
    );
}