/**
 * # 路由 /admin/permissions 权限管理（仅管理员可编辑）
 * 按角色配置：菜单功能权限（树形勾选）+ MCP / API 访问开关。
 * admin 角色恒为全量且不可编辑（防锁死）；customer 未勾选任何菜单即无后台权限。
 * 配置存 settings.permissions；服务端 requireCapability 叠加校验（域内至少一个菜单）。
 */
import { createFileRoute, useRouter } from "@tanstack/react-router";
import { App, Alert, Button, Card, Space, Spin, Switch, Tag, Tree, Typography } from "antd";
import { Save } from "lucide-react";
import { useEffect, useMemo, useState } from "react";
import { adminGetPermissions, adminSavePermissions } from "~/server/permissions";
import { Forbidden, PageHeader, guardAdmin } from "~/components/admin/common";
import { ADMIN_MENU_GROUPS } from "~/admin-menus";
import { useAdminT } from "~/admin-i18n";

export const Route = createFileRoute("/admin/permissions")({
  loader: () => guardAdmin(() => adminGetPermissions()),
  component: PermissionsPage,
});

/** # 类型 权限页数据（loader 返回：各角色有效授权 + 是否已显式配置） **/
type PermData = Record<string, { menus: string[]; mcp: boolean; api: boolean; configured: boolean }>;

/** # 成员变量 可编辑角色（admin 恒全量，不在此列） **/
const EDITABLE_ROLES = ["manager", "editor", "customer"] as const;

/** # 成员变量 角色中文标签与说明 **/
const ROLE_META: Record<string, { label: string; desc: string }> = {
  manager: { label: "经理", desc: "默认：内容 + 商务全部菜单，MCP / API 开启" },
  editor: { label: "编辑", desc: "默认：内容全部菜单，MCP / API 关闭" },
  customer: { label: "客户", desc: "商城注册用户，默认无任何后台权限" },
};

/** # 成员变量 分组 key → 该组全部菜单 key（父子联动勾选换算用） **/
const GROUP_CHILDREN = new Map(ADMIN_MENU_GROUPS.map((g) => [`group:${g.label}`, g.children.map((m) => m.key)]));

/** # 函数 菜单树数据（分组 → 菜单；标题经 t() 翻译，key 即菜单路由） */
function buildMenuTree(t: (s: string) => string) {
  return ADMIN_MENU_GROUPS.map((g) => ({
    title: t(g.label),
    key: `group:${g.label}`,
    children: g.children.map((m) => ({ title: t(m.label), key: m.key })),
  }));
}

/** # 函数 权限管理页面组件 */
function PermissionsPage() {
  const t = useAdminT();
  const data = Route.useLoaderData() as PermData | null;
  const router = useRouter();
  const { message } = App.useApp();
  /** # 成员变量 各角色草稿（勾选菜单 + MCP/API 开关） **/
  const [draft, setDraft] = useState<Record<string, { menus: Set<string>; mcp: boolean; api: boolean }>>({});
  /** # 成员变量 保存中 **/
  const [saving, setSaving] = useState(false);

  useEffect(() => {
    if (!data) return;
    setDraft(
      Object.fromEntries(
        EDITABLE_ROLES.map((role) => [
          role,
          { menus: new Set(data[role]?.menus ?? []), mcp: data[role]?.mcp ?? false, api: data[role]?.api ?? false },
        ]),
      ),
    );
  }, [data]);

  /** # 成员变量 未登录/无权限（非 admin）占位 **/
  const forbidden = useMemo(() => !data, [data]);
  if (forbidden) return <Forbidden />;

  /** # 函数 Tree 勾选变化：父子联动后把「整组全选」折叠回分组 key 存储（等价语义） */
  function handleCheck(role: string, checked: { checked: string[] }) {
    setDraft((d) => {
      const menus = new Set<string>();
      for (const k of checked.checked) {
        if (k.startsWith("group:")) {
          const children = GROUP_CHILDREN.get(k) ?? [];
          children.forEach((c) => menus.add(c));
        } else menus.add(k);
      }
      return { ...d, [role]: { ...d[role]!, menus } };
    });
  }

  /** # 函数 Tree 默认勾选项（整组全选渲染为分组勾选） */
  function checkedKeys(role: string): string[] {
    const menus = draft[role]?.menus ?? new Set<string>();
    const keys: string[] = [];
    for (const [gk, children] of GROUP_CHILDREN) {
      if (children.every((c) => menus.has(c))) keys.push(gk);
      else children.forEach((c) => menus.has(c) && keys.push(c));
    }
    return keys;
  }

  /** # 函数 保存：提交全部角色草稿 */
  async function handleSave() {
    setSaving(true);
    try {
      await adminSavePermissions({
        data: {
          roles: Object.fromEntries(
            EDITABLE_ROLES.map((role) => [
              role,
              { menus: [...(draft[role]?.menus ?? [])], mcp: draft[role]?.mcp ?? false, api: draft[role]?.api ?? false },
            ]),
          ),
        },
      });
      message.success(t("权限配置已保存"));
      await router.invalidate();
    } catch (e) {
      message.error(e instanceof Error ? e.message : t("保存失败"));
    } finally {
      setSaving(false);
    }
  }

  return (
    <Card size="small">
      <PageHeader
        title={t("权限管理")}
        extra={
          <Button type="primary" icon={<Save size={14} aria-hidden />} loading={saving} onClick={() => void handleSave()}>
            {t("保存")}
          </Button>
        }
      />
      <Alert
        type="info"
        showIcon
        style={{ marginBottom: 16 }}
        message={t("按角色配置菜单功能权限与 MCP / API 访问。admin 角色恒为全量，不可编辑；未勾选任何菜单的角色无法访问对应后台页面。")}
      />
      <Space orientation="vertical" size={16} style={{ display: "flex" }}>
        {EDITABLE_ROLES.map((role) =>
          draft[role] ? (
            <Card
              key={role}
              type="inner"
              size="small"
              title={
                <Space size={8}>
                  <Tag color={role === "manager" ? "geekblue" : role === "editor" ? "cyan" : "default"}>{t(ROLE_META[role]!.label)}</Tag>
                  <Typography.Text type="secondary" style={{ fontSize: 13, fontWeight: 400 }}>{t(ROLE_META[role]!.desc)}</Typography.Text>
                </Space>
              }
              extra={
                <Space size={16}>
                  <Space size={6}>
                    <Typography.Text style={{ fontSize: 13 }}>MCP</Typography.Text>
                    <Switch size="small" checked={draft[role]!.mcp} onChange={(v) => setDraft((d) => ({ ...d, [role]: { ...d[role]!, mcp: v } }))} />
                  </Space>
                  <Space size={6}>
                    <Typography.Text style={{ fontSize: 13 }}>API</Typography.Text>
                    <Switch size="small" checked={draft[role]!.api} onChange={(v) => setDraft((d) => ({ ...d, [role]: { ...d[role]!, api: v } }))} />
                  </Space>
                </Space>
              }
            >
              <Tree
                checkable
                selectable={false}
                defaultExpandAll
                checkedKeys={checkedKeys(role)}
                onCheck={(_, info) => handleCheck(role, { checked: (info as unknown as { checked: string[] }).checked })}
                treeData={buildMenuTree(t)}
                style={{ maxWidth: 560 }}
              />
            </Card>
          ) : (
            <Spin key={role} />
          ),
        )}
      </Space>
    </Card>
  );
}