<?php
/**
 * 空笺未寄 — functions.php
 */

// ── 主题设置 ──────────────────────────────────
add_action('after_setup_theme', 'kjweji_setup');
function kjweji_setup() {
    add_theme_support('title-tag');
    add_theme_support('post-thumbnails');
    add_image_size('kjweji-featured', 960, 400, true);
    add_image_size('kjweji-card', 600, 375, true);
    add_theme_support('custom-logo', array(
        'height' => 40,
        'width'  => 160,
        'flex-height' => true,
    ));
    add_theme_support('html5', array(
        'comment-form', 'comment-list', 'gallery', 'caption', 'style', 'script',
    ));
    register_nav_menus(array(
        'primary' => '主导航',
    ));
}

// ── 资源加载 ──────────────────────────────────
add_action('wp_enqueue_scripts', 'kjweji_enqueue_assets');
function kjweji_enqueue_assets() {
    wp_enqueue_style('kjweji-style', get_stylesheet_uri(), array(), '1.0.0');
    // 字体改用系统自带（Google Fonts 在中国大陆不可用）
    wp_enqueue_script('kjweji-lightbox',
        get_template_directory_uri() . '/assets/js/lightbox.js',
        array(), '1.0.0', true);
}

// ── 注册自定义文章类型: tucao（微言） ──────────
add_action('init', 'kjweji_register_tucao');
function kjweji_register_tucao() {
    register_post_type('tucao', array(
        'labels' => array(
            'name'               => '微言',
            'singular_name'      => '微言',
            'add_new'            => '写微言',
            'add_new_item'       => '写一条微言',
            'edit_item'          => '编辑微言',
            'new_item'           => '新微言',
            'view_item'          => '查看微言',
            'search_items'       => '搜索微言',
            'not_found'          => '暂无微言',
            'not_found_in_trash' => '回收站中暂无微言',
        ),
        'public'            => true,
        'has_archive'       => true,
        'rewrite'           => array('slug' => 'tucao'),
        'show_in_rest'      => true,
        'supports'          => array('title', 'editor', 'author', 'thumbnail', 'comments'),
        'menu_position'     => 25,
        'menu_icon'         => 'dashicons-format-chat',
        'supports'          => array('title', 'editor', 'author', 'thumbnail', 'comments'),
    ));
}

// 主题激活时，把已存在的 tucao 文章全部开放评论
add_action('after_switch_theme', 'kjweji_open_tucao_comments');
function kjweji_open_tucao_comments() {
    $posts = get_posts(array('post_type' => 'tucao', 'posts_per_page' => -1, 'post_status' => 'any'));
    foreach ($posts as $post) {
        wp_update_post(array('ID' => $post->ID, 'comment_status' => 'open'));
    }
}

// ── 摘要取前 2-3 句 ───────────────────────────
// 摘要：取文章内容的前 N 个字符（在句号处截断）
function kjweji_excerpt($max_sentences = 5, $max_chars = 300) {
    $content = get_the_content();
    $content = wp_strip_all_tags($content);
    if (empty($content)) return '';
    // 先按字符截断
    if (mb_strlen($content) > $max_chars) {
        $content = mb_substr($content, 0, $max_chars);
        // 回退到最后一个句号
        $last_period = mb_strrpos($content, '。');
        if ($last_period !== false && $last_period > $max_chars / 2) {
            $content = mb_substr($content, 0, $last_period + 1);
        }
    }
    return esc_html(trim($content));
}

// ── OG 标签 ───────────────────────────────────
add_action('wp_head', 'kjweji_og_tags');
function kjweji_og_tags() {
    if (is_singular()) {
        $title = get_the_title();
        $desc  = kjweji_excerpt(2);
        $url   = get_permalink();
    } else {
        $title = get_bloginfo('name');
        $desc  = get_bloginfo('description');
        $url   = home_url();
    }
    echo '<meta property="og:type" content="' . (is_singular() ? 'article' : 'website') . '" />' . "\n";
    echo '<meta property="og:title" content="' . esc_attr($title) . '" />' . "\n";
    echo '<meta property="og:description" content="' . esc_attr($desc) . '" />' . "\n";
    echo '<meta property="og:url" content="' . esc_url($url) . '" />' . "\n";
    if (is_singular() && has_post_thumbnail()) {
        $img = get_the_post_thumbnail_url(null, 'kjweji-featured');
        echo '<meta property="og:image" content="' . esc_url($img) . '" />' . "\n";
    }
    echo '<meta name="twitter:card" content="summary_large_image" />' . "\n";
}

// ── 首页只显示普通文章（非 tucao） ─────────────
add_action('pre_get_posts', 'kjweji_home_only_posts');
function kjweji_home_only_posts($query) {
    if (!is_admin() && $query->is_main_query() && $query->is_home()) {
        $query->set('post_type', 'post');
    }
}

// 浏览量
function kjweji_get_views() {
    $count = get_post_meta(get_the_ID(), 'post_views', true);
    return $count ? (int) $count : 0;
}

// 禁用 WP emoji 转图片
remove_action('wp_head', 'print_emoji_detection_script', 7);
remove_action('wp_print_styles', 'print_emoji_styles');
remove_action('admin_print_scripts', 'print_emoji_detection_script');
remove_action('admin_print_styles', 'print_emoji_styles');

add_filter('emoji_svg_url', '__return_false');

// 隐藏顶部 admin bar
add_filter('show_admin_bar', '__return_false');

// 评论表单中文化
add_filter('comment_form_default_fields', function($fields) {
    $fields['author'] = '<p class="comment-form-author"><label for="author">显示名称</label><input id="author" name="author" type="text" size="30" /></p>';
    $fields['email'] = '<p class="comment-form-email"><label for="email">邮箱</label><input id="email" name="email" type="email" size="30" /></p>';
    $fields['url'] = '<p class="comment-form-url"><label for="url">网站</label><input id="url" name="url" type="url" size="30" /></p>';
    $fields['cookies'] = '<p class="comment-form-cookies-consent"><input id="wp-comment-cookies-consent" name="wp-comment-cookies-consent" type="checkbox" value="yes" /><label for="wp-comment-cookies-consent">在此浏览器中保存我的信息</label></p>';
    return $fields;
});

// 评论无需审核直接发布
add_filter('pre_comment_approved', function() { return 1; });

add_action('template_include', function($template) {
    if (get_query_var('post_type') === 'post' && !is_home() && !is_singular()) {
        $t = locate_template('archive.php');
        if ($t) return $t;
    }
    return $template;
});


// ── 本地头像：用户资料页上传 ─────────────────────
add_action('show_user_profile', 'kjweji_avatar_field');
add_action('edit_user_profile', 'kjweji_avatar_field');
function kjweji_avatar_field($user) {
    wp_enqueue_media();
    $att_id = get_user_meta($user->ID, 'custom_avatar', true);
    $preview = $att_id ? wp_get_attachment_image_url($att_id, 'medium') : '';
    wp_nonce_field('kjweji_avatar_nonce', 'kjweji_avatar_nonce_field');
    echo '<h3>自定义头像</h3>';
    echo '<table class="form-table"><tr><th><label>上传本地头像</label></th><td>';
    echo '<input type="hidden" id="custom_avatar" name="custom_avatar" value="' . esc_attr($att_id) . '" />';
    echo '<div id="avatar_preview" style="margin-bottom:10px">';
    if ($preview) echo '<img src="' . esc_url($preview) . '" style="max-width:120px;border-radius:8px;" />';
    echo '</div>';
    echo '<button type="button" class="button" id="upload_avatar_btn">选择图片</button>';
    echo '<button type="button" class="button" id="remove_avatar_btn" style="margin-left:5px;' . ($att_id ? '' : 'display:none;') . '">移除</button>';
    echo '</td></tr></table>';
    echo '<script>
        jQuery(function($) {
            var frame;
            $("#upload_avatar_btn").click(function(e) {
                e.preventDefault();
                if (frame) { frame.open(); return; }
                frame = wp.media({ title: "选择头像", button: { text: "设为头像" }, multiple: false });
                frame.on("select", function() {
                    var att = frame.state().get("selection").first().toJSON();
                    $("#custom_avatar").val(att.id);
                    $("#avatar_preview").html("<img src=\'" + att.url + "\' style=\'max-width:120px;border-radius:8px;\' />");
                    $("#remove_avatar_btn").show();
                });
                frame.open();
            });
            $("#remove_avatar_btn").click(function() {
                $("#custom_avatar").val("");
                $("#avatar_preview").html("");
                $(this).hide();
            });
        });
    </script>';
}
add_action('personal_options_update', 'kjweji_save_avatar');
add_action('edit_user_profile_update', 'kjweji_save_avatar');
function kjweji_save_avatar($user_id) {
    if (!current_user_can('edit_user', $user_id)) return;
    if (!isset($_POST['kjweji_avatar_nonce_field']) || !wp_verify_nonce($_POST['kjweji_avatar_nonce_field'], 'kjweji_avatar_nonce')) return;
    if (isset($_POST['custom_avatar'])) {
        $att_id = intval($_POST['custom_avatar']);
        if ($att_id) {
            update_user_meta($user_id, 'custom_avatar', $att_id);
        } else {
            delete_user_meta($user_id, 'custom_avatar');
        }
    }
}

// 本地头像（团队证件照）
add_filter('get_avatar', function($avatar, $id_or_email, $size, $default, $alt) {
    $uid = 0;
    if (is_numeric($id_or_email)) $uid = (int) $id_or_email;
    elseif (is_object($id_or_email) && isset($id_or_email->user_id)) $uid = (int) $id_or_email->user_id;
    elseif (is_object($id_or_email) && $id_or_email instanceof WP_Comment) {
        $uid = (int) $id_or_email->user_id;
    }
    // 如果传的是 email 但找不到用户，尝试用 email 找
    if (!$uid && is_string($id_or_email) && strpos($id_or_email, '@') !== false) {
        $u = get_user_by('email', $id_or_email);
        if ($u) $uid = $u->ID;
    }
    $att_id = get_user_meta($uid, 'custom_avatar', true);
    if ($att_id) {
        $url = wp_get_attachment_image_url($att_id, 'medium');
        if ($url) {
            return '<img src="' . esc_url($url) . '" class="avatar avatar-' . $size . ' photo" width="' . $size . '" height="' . $size . '" alt="" />';
        }
    }
    return $avatar; // fallback
}, 10, 5);

// 激活主题时自动初始化
add_action('after_switch_theme', 'kjweji_setup_pages');
function kjweji_setup_pages() {
    // 创建笺文页
    if (!get_page_by_path('articles')) {
        wp_insert_post([
            'post_title' => '笺文', 'post_name' => 'articles',
            'post_type' => 'page', 'post_status' => 'publish',
            'meta_input' => ['_wp_page_template' => 'page-articles.php'],
        ]);
    }
    // 创建拾影页
    if (!get_page_by_path('photos')) {
        wp_insert_post([
            'post_title' => '拾影', 'post_name' => 'photos',
            'post_type' => 'page', 'post_status' => 'publish',
            'meta_input' => ['_wp_page_template' => 'page-photos.php'],
        ]);
    }
    // 创建导航菜单
    if (!wp_get_nav_menu_object('主导航')) {
        $menu_id = wp_create_nav_menu('主导航');
        foreach ([
            ['首页', '/'],
            ['笺文', '/articles/'],
            ['微言', '/tucao/'],
            ['拾影', '/photos/'],
        ] as $item) {
            wp_update_nav_menu_item($menu_id, 0, [
                'menu-item-title' => $item[0],
                'menu-item-url' => $item[1],
                'menu-item-status' => 'publish',
            ]);
        }
        $locations = get_theme_mod('nav_menu_locations') ?: [];
        $locations['primary'] = $menu_id;
        set_theme_mod('nav_menu_locations', $locations);
    }
    flush_rewrite_rules();
}

// ── 检查固定链接格式 ──────────────────────────
// 如果启用了 /index.php/ 前缀，自定义文章类型的路由会失效
add_action('admin_notices', 'kjweji_permalink_notice');
function kjweji_permalink_notice() {
    $permalink = get_option('permalink_structure');
    if ($permalink && strpos($permalink, 'index.php') !== false) {
        echo '<div class="notice notice-warning is-dismissible"><p><strong>空笺未寄主题提示：</strong>检测到固定链接包含 <code>/index.php/</code>，会导致「微言」和「拾影」页面无法访问。建议在「设置 → 固定链接」中改用不含 <code>index.php</code> 的格式（如 <code>/%postname%/</code>）。</p></div>';
    }
}

// 自定义文章类型：拾影
add_action('init', 'kjweji_register_photo');
function kjweji_register_photo() {
    register_post_type('photo', array(
        'labels' => array(
            'name' => '拾影',
            'singular_name' => '拾影',
            'add_new' => '发拾影',
            'add_new_item' => '发新拾影',
            'edit_item' => '编辑拾影',
        ),
        'public' => true,
        'has_archive' => false,
        'rewrite' => array('slug' => 'photo/%post_id%'),
        'show_in_rest' => true,
        'supports' => array('title', 'editor', 'author', 'thumbnail'),
        'menu_position' => 26,
        'menu_icon' => 'dashicons-format-gallery',
    ));
}


add_filter('post_type_link', function($link, $post) {
    if ($post->post_type === 'photo' && $post->post_status === 'publish') {
        return home_url(user_trailingslashit('/photo/' . $post->ID . '/' . $post->post_name));
    }
    return $link;
}, 10, 2);

// 匹配 /photo/123/slug/ 格式
add_action('init', function() {
    add_rewrite_rule('^photo/([0-9]+)/([^/]+)/?$', 'index.php?post_type=photo&p=$matches[1]', 'top');
    add_rewrite_rule('^photo/([0-9]+)/?$', 'index.php?post_type=photo&p=$matches[1]', 'top');
});

// 允许通过 REST API 创建评论
add_filter('rest_allow_anonymous_comments', '__return_false');

// 评论后重定向回当前页


// tucao 不要详情页，直接回 archive
add_action('template_redirect', function() {
    if (is_singular('tucao')) {
        wp_redirect(get_post_type_archive_link('tucao'), 301);
        exit;
    }
});

// 评论后送回微言列表并锚点定位
add_filter('comment_post_redirect', function($loc, $comment) {
    $post = get_post($comment->comment_post_ID);
    if ($post && $post->post_type === 'tucao') {
        return get_post_type_archive_link('tucao') . '#tucao-' . $comment->comment_post_ID;
    }
    return $loc;
}, 99, 2);

// 中国时区
date_default_timezone_set('Asia/Shanghai');

// 评论回复标题中文化
add_filter('comment_form_defaults', function($defaults) {
    $defaults['title_reply_to'] = '回复 %s';
    $defaults['cancel_reply_link'] = '取消回复';
    $defaults['title_reply_before'] = '<h3 class="comment-reply-title">';
    $defaults['title_reply_after'] = '</h3>';
    return $defaults;
});

// ── Customizer（外观 → 自定义 → 空笺未寄设置） ────
add_action('customize_register', 'kjweji_customize_register');
function kjweji_customize_register($wp_customize) {
    // 注册 section
    $wp_customize->add_section('kjweji_settings', array(
        'title'    => '空笺未寄设置',
        'priority' => 30,
    ));

    // ── 首页 ──
    $wp_customize->add_setting('kjweji_hero_intro', array(
        'default'           => "这里是自白者的栖息地。\n吐槽，落笔，沉思，接住那一缕若有的情绪。\n片语只言，皆是存在。",
        'sanitize_callback' => 'sanitize_textarea_field',
    ));
    $wp_customize->add_control('kjweji_hero_intro', array(
        'label'   => '首页介绍文字',
        'section' => 'kjweji_settings',
        'type'    => 'textarea',
    ));

    $wp_customize->add_setting('kjweji_hero_couplet', array(
        'default'           => '空笺待写千般意，未寄先存一寸心',
        'sanitize_callback' => 'sanitize_text_field',
    ));
    $wp_customize->add_control('kjweji_hero_couplet', array(
        'label'   => '首页对联',
        'section' => 'kjweji_settings',
        'type'    => 'text',
    ));

    $wp_customize->add_setting('kjweji_hero_couplet_hl1', array(
        'default'           => '千般意',
        'sanitize_callback' => 'sanitize_text_field',
    ));
    $wp_customize->add_control('kjweji_hero_couplet_hl1', array(
        'label'   => '对联高亮词1',
        'section' => 'kjweji_settings',
        'type'    => 'text',
    ));

    $wp_customize->add_setting('kjweji_hero_couplet_hl2', array(
        'default'           => '一寸心',
        'sanitize_callback' => 'sanitize_text_field',
    ));
    $wp_customize->add_control('kjweji_hero_couplet_hl2', array(
        'label'   => '对联高亮词2',
        'section' => 'kjweji_settings',
        'type'    => 'text',
    ));

    // ── 页脚 ──
    $wp_customize->add_setting('kjweji_footer_motto', array(
        'default'           => '空笺待写千般意，未寄先存一寸心',
        'sanitize_callback' => 'sanitize_text_field',
    ));
    $wp_customize->add_control('kjweji_footer_motto', array(
        'label'   => '页脚格言',
        'section' => 'kjweji_settings',
        'type'    => 'text',
    ));

    $wp_customize->add_setting('kjweji_footer_text', array(
        'default'           => '每一段文字，都在时光里等待回音',
        'sanitize_callback' => 'sanitize_text_field',
    ));
    $wp_customize->add_control('kjweji_footer_text', array(
        'label'   => '页脚版权文案',
        'section' => 'kjweji_settings',
        'type'    => 'text',
    ));

    // ── 页面副标题 ──
    $wp_customize->add_setting('kjweji_articles_subtitle', array(
        'default'           => '字里行间，尽是岁月',
        'sanitize_callback' => 'sanitize_text_field',
    ));
    $wp_customize->add_control('kjweji_articles_subtitle', array(
        'label'   => '笺文页副标题',
        'section' => 'kjweji_settings',
        'type'    => 'text',
    ));

    $wp_customize->add_setting('kjweji_photos_subtitle', array(
        'default'           => '在时光里截图',
        'sanitize_callback' => 'sanitize_text_field',
    ));
    $wp_customize->add_control('kjweji_photos_subtitle', array(
        'label'   => '拾影页副标题',
        'section' => 'kjweji_settings',
        'type'    => 'text',
    ));
}

// tucao 自动生成标题
add_filter('wp_insert_post_data', function($data) {
    if ($data['post_type'] === 'tucao' && empty($data['post_title'])) {
        $data['post_title'] = '微言-' . time();
    }
    return $data;
});