'use client';

import { useMemo, useState } from 'react';
import {
  FoxListContainer,
  type FoxListColumn,
} from '@fox/core/components/fox-list-container';
import { FoxStatusIndicator } from '@fox/core/components/fox-status-indicator';
import {
  FoxCaretDownIcon,
  FoxCaretRightIcon,
  FoxFileIcon,
  FoxFolderIcon,
} from '@fox/core/icons';
import {
  buildMenuTree,
  collectNodeIds,
  collectRoleOptions,
  flattenOpenNodes,
  formatActiveLabel,
  formatOptionalValue,
  type SystemMenu,
  type SystemMenuNode,
} from '@/lib/domain/system-menu';
import { MenuFormModal } from './menu-form-modal';
import { MenuRowActions } from './menu-row-actions';
import styles from './menu-tree.module.scss';

interface MenuTreeListProps {
  items: SystemMenu[];
}

type FormTarget =
  | { mode: 'edit'; node: SystemMenuNode }
  | { mode: 'create'; parent: SystemMenuNode };

/** 깊이만큼 이름을 밀어 넣는다. 표 칸이라 여백은 인라인으로 준다. */
const INDENT_REM = 2;

export function MenuTreeList({ items }: MenuTreeListProps) {
  const tree = useMemo(() => buildMenuTree(items), [items]);
  const roleOptions = useMemo(() => collectRoleOptions(items), [items]);
  const byId = useMemo(() => new Map(items.map((item) => [item.id, item])), [items]);

  const [closedIds, setClosedIds] = useState<Set<string>>(new Set());
  const [target, setTarget] = useState<FormTarget | null>(null);

  const isOpen = (id: string) => !closedIds.has(id);

  function toggle(id: string) {
    setClosedIds((prev) => {
      const next = new Set(prev);
      if (next.has(id)) {
        next.delete(id);
      } else {
        next.add(id);
      }
      return next;
    });
  }

  const allBranchIds = useMemo(() => collectNodeIds(tree), [tree]);
  const isAllOpen = closedIds.size === 0;

  function toggleAll() {
    setClosedIds(isAllOpen ? new Set(allBranchIds) : new Set());
  }

  const rows = flattenOpenNodes(tree, isOpen);

  const columns: FoxListColumn<SystemMenuNode>[] = [
    { key: 'id', header: '번호', width: 100 },
    {
      key: 'toggle',
      header: (
        <button
          type="button"
          className={styles.toggle}
          aria-label={isAllOpen ? '모두 접기' : '모두 펼치기'}
          aria-expanded={isAllOpen}
          onClick={toggleAll}
        >
          {isAllOpen ? <FoxCaretDownIcon /> : <FoxCaretRightIcon />}
        </button>
      ),
      width: 60,
      render: (row) =>
        row.children.length > 0 ? (
          <button
            type="button"
            className={styles.toggle}
            aria-label={`${row.name} ${isOpen(row.id) ? '접기' : '펼치기'}`}
            aria-expanded={isOpen(row.id)}
            onClick={() => toggle(row.id)}
          >
            {isOpen(row.id) ? <FoxCaretDownIcon /> : <FoxCaretRightIcon />}
          </button>
        ) : null,
    },
    {
      key: 'name',
      header: '메뉴명',
      width: 420,
      emphasis: true,
      render: (row) => (
        <span
          className={styles.name}
          style={{ paddingInlineStart: `${row.depth * INDENT_REM}rem` }}
        >
          <span className={styles.icon}>
            {row.children.length > 0 ? <FoxFolderIcon /> : <FoxFileIcon />}
          </span>
          {row.name}
        </span>
      ),
    },
    { key: 'sortOrder', header: '메뉴순번', width: 120, align: 'center' },
    {
      key: 'isActive',
      header: '활성여부',
      width: 120,
      render: (row) => (
        <FoxStatusIndicator
          type={row.isActive ? 'success' : 'danger'}
          label={formatActiveLabel(row.isActive)}
        />
      ),
    },
    {
      key: 'roleName',
      header: '권한',
      width: 160,
      render: (row) => formatOptionalValue(row.roleName),
    },
    {
      key: 'actions',
      header: '관리',
      width: 140,
      render: (row) => (
        <MenuRowActions
          node={row}
          onEdit={(node) => setTarget({ mode: 'edit', node })}
          onAddChild={(node) => setTarget({ mode: 'create', parent: node })}
        />
      ),
    },
  ];

  return (
    <>
      <FoxListContainer<SystemMenuNode>
        title="메뉴관리"
        breadcrumb={[
          { label: '홈', href: '/' },
          { label: '시스템관리' },
          { label: '메뉴관리' },
        ]}
        caption="메뉴 목록"
        columns={columns}
        rows={rows}
        rowKey={(row) => row.id}
        totalCount={items.length}
        emptyMessage="등록된 메뉴가 없습니다."
        searchHidden
      />

      {target && (
        <MenuFormModal
          mode={target.mode}
          menu={target.mode === 'edit' ? target.node : undefined}
          parent={
            target.mode === 'edit'
              ? (target.node.parentId ? (byId.get(target.node.parentId) ?? null) : null)
              : target.parent
          }
          roleOptions={roleOptions}
          onClose={() => setTarget(null)}
        />
      )}
    </>
  );
}