/**
 * # 模块 Elementor 文档瘦身
 * WordPress 导入的 Elementor JSON 包含大量桌面/平板/移动端响应式字段与空值，
 * 整份文档会随 TanStack Router 脱水序列化进 SSR HTML（首页曾达 391KB），
 * 严重影响 SEO 与首字节体积。本模块只保留渲染器实际读取的字段。
 */

/** # 成员变量 渲染器（Renderer.tsx）实际读取的 settings 字段白名单 **/
const SETTING_KEYS = new Set([
  // 通用布局/背景/边框
  "__globals__",
  "align",
  "background_background",
  "background_color",
  "background_color_b",
  "background_color_stop_b",
  "background_image",
  // section 级背景定位/平铺（H11 底图 bottom center + no-repeat）
  "background_position",
  "background_repeat",
  // 背景尺寸（initial → 100% auto，H13 列背景楼体图）
  "background_size",
  // icon-list 视图（inline = 横排链接条，H13）
  "view",
  "border_border",
  "border_color",
  "border_radius",
  "border_width",
  "content_width",
  "custom_height",
  "padding",
  "layout",
  "height",
  "size",
  "space",
  "color",
  "text_color",
  "title_color",
  "button_text_color",
  "button_background_hover_color",
  "hover_color",
  "text_padding",
  // image-box 系列：图定位（position 默认 top）与标题标签（title_size 默认 h3）
  "position",
  "title_size",
  // image-box 行布局（H11）：图宽 image_size%、标题底距、内容垂直对齐
  "image_size",
  "title_bottom_space",
  "content_vertical_alignment",
  // image-box 图标间距/文本对齐/标题与描述排版（H13.5 counter 条）
  "image_space",
  "text_align",
  "title_typography_typography",
  "title_typography_font_size",
  "title_typography_font_size_mobile",
  "title_typography_font_size_tablet",
  "title_typography_font_weight",
  "description_typography_typography",
  "description_typography_font_size",
  "description_typography_font_size_mobile",
  "description_typography_font_size_tablet",
  "gradient_angle",
  "color_a",
  "color_b",
  "header_size",
  // 组件自带盒间距与列 margin（heading/text-editor 的 _padding；内层列 margin）
  "_padding",
  "margin",
  // Typography 组合字段（typography_typography=custom 时逐键采用）
  "typography_typography",
  "typography_font_family",
  "typography_font_size",
  "typography_font_size_tablet",
  "typography_font_size_mobile",
  "typography_font_weight",
  "typography_line_height",
  "typography_letter_spacing",
  "typography_word_spacing",
  "typography_text_transform",
  "typography_font_style",
  "typography_text_decoration",
  // 列结构
  "_column_size",
  "_inline_size",
  // section 间隙档位（决定子列默认 populated padding：no 0 / default 10 / …）
  "gap",
  // 各 widget 数据
  "heading_title",
  "title",
  "title_text",
  "description",
  "description_text",
  "selected_icon",
  "url",
  "width",
  "text",
  "editor",
  "html",
  "source_code",
  "image",
  "link",
  "prefix",
  "suffix",
  "ending_number",
  "icon_list",
  "social_icon_list",
  "slides",
  "slides_height",
  "tabs",
  "tabs_align_horizontal",
  "tab_active_color",
  "video_url",
  "youtube_url",
  "map",
  "posts_per_page",
  "cards_posts_per_page",
  "post_type",
  "eael_ticker_tag_text",
  // EAEL Infobox / flip-box / 高级标签页 / 数据表 / 评价等（Renderer 对应组件读取）
  "custom_css",
  "_css_classes",
  "eael_infobox_title",
  "eael_infobox_text",
  "eael_infobox_title_tag",
  "eael_infobox_image",
  "eael_infobox_img_type",
  "eael_infobox_img_margin",
  "eael_infobox_title_margin",
  "eael_infobox_title_margin_mobile",
  "eael_infobox_title_typography_typography",
  "eael_infobox_title_typography_font_size",
  "hover_animation",
  // widget 高级盒模型（如 eael-info-box 边框卡：_border_* + _padding/_margin）
  "_margin",
  // widget 宽度模式（auto → 按内容宽横排，如 H7 图标行）
  "_element_width",
  // widget 容器背景（如 H4 标题下的橙线图）
  "_background_image",
  "_background_position",
  "_background_repeat",
  // section 背景遮罩（.elementor-background-overlay，H11 电路板图+渐变）
  "background_overlay_background",
  "background_overlay_color",
  "background_overlay_color_b",
  "background_overlay_opacity",
  "background_overlay_gradient_angle",
  "_border_border",
  "_border_color",
  "_border_width",
  "_border_radius",
  "title_text_a",
  "description_text_a",
  "button_text",
  "background_a_image",
  "eael_adv_tabs_tab",
  "eael_data_table_header_cols_data",
  "eael_data_table_content_rows",
  "eael_testimonial_name",
  "eael_testimonial_company_title",
  "eael_testimonial_description",
]);

/** # 函数 收窄对象型 settings 值（渲染器只读 url/alt/target 等少数字段）
 * 参数 key settings 键名；val 原始值
 * 返回值 收窄后的值；非命中键原样返回
 */
function slimSettingValue(key: string, val: unknown): unknown {
  if (!val || typeof val !== "object" || Array.isArray(val)) return val;
  const v = val as Record<string, unknown>;
  if (key === "image" || key === "background_image" || key === "background_a_image" || key === "eael_infobox_image") {
    // 渲染器只读 url / alt
    return { url: v.url, alt: v.alt };
  }
  if (key === "link") {
    // 渲染器只读 url / target / is_external（is_external=on → target=_blank，与原站 link_attributes 一致）
    return { url: v.url, target: v.target, is_external: v.is_external };
  }
  return val;
}

/** # 函数 递归瘦身单个 Elementor 元素
 * 参数 el 原始元素（section/column/widget 通用结构）
 * 返回值 仅含 id/elType/widgetType/isInner/白名单 settings/elements 的新对象
 */
function slimElement(el: unknown): unknown {
  if (!el || typeof el !== "object") return el;
  const src = el as Record<string, unknown>;
  const out: Record<string, unknown> = {};
  if (src.id != null) out.id = src.id;
  if (src.elType != null) out.elType = src.elType;
  if (src.widgetType != null) out.widgetType = src.widgetType;
  if (src.isInner) out.isInner = true;
  const st = src.settings;
  if (st && typeof st === "object" && !Array.isArray(st)) {
    const slim: Record<string, unknown> = {};
    for (const key of Object.keys(st as Record<string, unknown>)) {
      if (SETTING_KEYS.has(key)) slim[key] = slimSettingValue(key, (st as Record<string, unknown>)[key]);
    }
    if (Object.keys(slim).length > 0) out.settings = slim;
  }
  if (Array.isArray(src.elements) && src.elements.length > 0) {
    out.elements = src.elements.map(slimElement);
  }
  return out;
}

/** # 函数 瘦身整份 Elementor 文档（数组或 {elements:[]} 包装均支持）
 * 参数 doc 原始文档（来自 meta.elementor）
 * 返回值 瘦身后的文档；非对象/数组输入原样返回
 */
export function slimElementorDoc(doc: unknown): unknown {
  if (Array.isArray(doc)) return doc.map(slimElement);
  if (doc && typeof doc === "object" && Array.isArray((doc as Record<string, unknown>).elements)) {
    const wrapped = doc as Record<string, unknown>;
    return { elements: (wrapped.elements as unknown[]).map(slimElement) };
  }
  return doc;
}

/** # 函数 瘦身内容 meta：替换 meta.elementor 为瘦身版（原 meta 其余字段保留）
 * 参数 meta 原始 meta JSON（可能为 null）
 * 返回值 elementor 已瘦身的 meta；无 elementor 时原样返回
 */
export function slimMetaElementor<T>(meta: T): T {
  if (!meta || typeof meta !== "object") return meta;
  const m = meta as Record<string, unknown>;
  if (!m.elementor) return meta;
  return { ...m, elementor: slimElementorDoc(m.elementor) } as T;
}