// 侧栏管理：内置块元数据与默认布局（管理页与前台注册表共用，勿在此引入组件）

export type SidebarScope = "home" | "board" | "post";

export interface SidebarBlockRef {
  key?: string;
  widget?: number;
}

export interface SidebarScopeConfig {
  left?: SidebarBlockRef[] | null;
  right?: SidebarBlockRef[] | null;
}

export interface SidebarConfig {
  version: number;
  scopes: Partial<Record<SidebarScope, SidebarScopeConfig>>;
}

export interface SidebarWidgetPublic {
  id: number;
  name: string;
  html: string;
  css: string;
  js: string;
}

export interface SidebarPublicPayload {
  config: SidebarConfig;
  widgets: SidebarWidgetPublic[];
}

export interface SidebarWidgetRecord {
  id: number;
  name: string;
  html: string;
  css: string;
  js: string;
  enabled: boolean;
  created_at: string;
  updated_at: string;
}

// 每侧最多放置块数（与后端 SidebarMaxBlocksPerSide 一致）
export const SIDEBAR_MAX_BLOCKS_PER_SIDE = 24;

export const SIDEBAR_SCOPE_LABELS: Record<SidebarScope, string> = {
  home: "首页",
  board: "板块页",
  post: "帖子详情",
};

export const SIDEBAR_SIDE_LABELS: Record<"left" | "right", string> = {
  left: "左栏",
  right: "右栏",
};

// 各页面范围可用的内置块（key → 展示名），与后端 sidebarBuiltinKeys 保持一致
export const SIDEBAR_WIDGET_META: Record<SidebarScope, Record<string, string>> = {
  home: {
    board_nav: "板块目录",
    pulse: "站点数据",
    announcements: "站点公告",
    ads: "自助推广",
    sponsors: "赞助商",
    hot: "热门讨论",
    new_users: "最新注册",
    active_users: "活跃成员",
    friend_links: "友情链接",
    about_site: "关于本站",
  },
  board: {
    board_moderators: "板块管理员",
    board_intro: "板块概况",
    board_pulse: "板块数据",
    board_hot: "本板热门",
    board_active: "活跃成员",
  },
  post: {
    post_board: "所属板块",
    post_author: "作者名片",
    post_author_posts: "作者其他帖",
    post_toc: "文章目录",
  },
};

// 内置块 icon（字符串引用，渲染方 import lucide-react 时映射）
// 保持轻量：不在 sidebarMeta 里引入组件
export const SIDEBAR_BLOCK_ICON: Record<string, string> = {
  board_nav: "layout-grid",
  pulse: "bar-chart-3",
  announcements: "megaphone",
  ads: "circle-dollar-sign",
  sponsors: "handshake",
  hot: "flame",
  new_users: "user-plus",
  active_users: "users",
  friend_links: "link2",
  about_site: "info",
  board_moderators: "shield-check",
  board_intro: "file-text",
  board_pulse: "bar-chart-3",
  board_hot: "flame",
  board_active: "users",
  post_board: "layers",
  post_author: "user",
  post_author_posts: "pen-line",
  post_toc: "list",
};

// 默认布局（= 历史硬编码渲染；后端 DefaultSidebarConfig 的前端镜像）
export function defaultSidebarConfig(): SidebarConfig {
  const refs = (keys: string[]): SidebarBlockRef[] => keys.map((key) => ({ key }));
  return {
    version: 1,
    scopes: {
      home: {
        left: refs(["board_nav"]),
        right: refs([
          "pulse",
          "announcements",
          "ads",
          "sponsors",
          "hot",
          "new_users",
          "active_users",
          "friend_links",
          "about_site",
        ]),
      },
      board: {
        left: [],
        right: refs(["board_moderators", "board_intro", "board_pulse", "board_hot", "board_active"]),
      },
      post: {
        left: refs(["post_board", "post_author", "post_author_posts"]),
        right: refs(["post_toc"]),
      },
    },
  };
}

// 按页面范围解析左右两列的块列表：
// - 未配置（nil）的侧回落默认布局，显式空数组 = 站长清空该侧；
// - board 范围左栏跟随 home.left（板块态仅管理右栏）。
export function sidebarScopeLists(
  config: SidebarConfig,
  scope: SidebarScope
): { left: SidebarBlockRef[]; right: SidebarBlockRef[] } {
  const def = defaultSidebarConfig().scopes;
  if (scope === "board") {
    return {
      left: config.scopes.home?.left ?? def.home?.left ?? [],
      right: config.scopes.board?.right ?? def.board?.right ?? [],
    };
  }
  return {
    left: config.scopes[scope]?.left ?? def[scope]?.left ?? [],
    right: config.scopes[scope]?.right ?? def[scope]?.right ?? [],
  };
}

// 块的展示名：内置取 META，自定义取备注名；未知返回 null（渲染时跳过）
export function sidebarBlockLabel(
  ref: SidebarBlockRef,
  widgets: { id: number; name: string }[]
): { label: string; custom: boolean } | null {
  if (ref.widget) {
    const w = widgets.find((x) => x.id === ref.widget);
    return w ? { label: w.name, custom: true } : null;
  }
  if (ref.key) {
    for (const scope of Object.keys(SIDEBAR_WIDGET_META) as SidebarScope[]) {
      const label = SIDEBAR_WIDGET_META[scope][ref.key];
      if (label) return { label, custom: false };
    }
  }
  return null;
}