/* eslint-disable max-lines-per-function -- 列表卡包含筛选态、行菜单与骨架，集中在一处便于对齐状态 */
import { Button, Dropdown, Skeleton } from '@douyinfe/semi-ui-19';
import type { RoleListItem } from '@lingxi/shared';
import { ErrorState, PageEmpty } from '@lingxi/ui';
import {
  IconCopy,
  IconDelete,
  IconEdit,
  IconMore,
  IconPause,
  IconPlay,
  IconShield,
  IconView,
} from '@lingxi/ui/icons';
import type { ReactNode } from 'react';
import { useState } from 'react';

import { scopeLabelOf } from './role-display';
import { RoleStatusTag } from './RoleStatusTag';

export type RoleRowAction = 'view' | 'rename' | 'edit' | 'copy' | 'disable' | 'enable' | 'delete';

export interface RoleListPanelProps {
  roles: readonly RoleListItem[];
  /** 未筛选的角色总数，用于区分「没有匹配」与「还没有自定义角色」 */
  totalCount: number;
  loading: boolean;
  error: Error | null;
  selectedRoleId: string | null;
  /** 卡头右侧说明：内置 / 自定义计数或「当前：角色名」 */
  note: string;
  footerNote?: string;
  canManage: boolean;
  showRowMenu: boolean;
  isFiltered: boolean;
  onSelect: (roleId: string) => void;
  onRowAction: (action: RoleRowAction, role: RoleListItem) => void;
  onCreate: () => void;
  onResetFilters: () => void;
  onRetry: () => void;
}

function rolePermissionText(role: RoleListItem): ReactNode {
  return (
    <>
      <b>{role.permissionCount}</b> 普通
      {role.specialPermissionCount > 0 ? (
        <span className="lx-role-row__special"> · ★{role.specialPermissionCount}</span>
      ) : null}
    </>
  );
}

function RowMenu({
  role,
  canManage,
  onRowAction,
}: {
  role: RoleListItem;
  canManage: boolean;
  onRowAction: (action: RoleRowAction, role: RoleListItem) => void;
}): ReactNode {
  const [visible, setVisible] = useState(false);
  if (!canManage) {
    return null;
  }
  const trigger = (action: RoleRowAction): void => {
    setVisible(false);
    onRowAction(action, role);
  };
  const menuItems: ReactNode[] = role.isSystem
    ? [
        <Dropdown.Item
          key="view"
          icon={<IconView size={14} />}
          onClick={() => {
            trigger('view');
          }}
        >
          查看角色
        </Dropdown.Item>,
        <Dropdown.Item
          key="rename"
          icon={<IconEdit size={14} />}
          onClick={() => {
            trigger('rename');
          }}
        >
          改名
        </Dropdown.Item>,
      ]
    : [
        <Dropdown.Item
          key="edit"
          icon={<IconEdit size={14} />}
          onClick={() => {
            trigger('edit');
          }}
        >
          编辑
        </Dropdown.Item>,
        <Dropdown.Item
          key="copy"
          icon={<IconCopy size={14} />}
          onClick={() => {
            trigger('copy');
          }}
        >
          复制
        </Dropdown.Item>,
        <Dropdown.Item
          key="toggle"
          icon={role.status === 'active' ? <IconPause size={14} /> : <IconPlay size={14} />}
          onClick={() => {
            trigger(role.status === 'active' ? 'disable' : 'enable');
          }}
        >
          {role.status === 'active' ? '停用' : '启用'}
        </Dropdown.Item>,
        <Dropdown.Divider key="divider" />,
        <Dropdown.Item
          key="delete"
          type="danger"
          icon={<IconDelete size={14} />}
          disabled={role.userCount > 0}
          onClick={() => {
            trigger('delete');
          }}
        >
          {role.userCount > 0 ? '删除（有绑定用户）' : '删除'}
        </Dropdown.Item>,
      ];
  return (
    <Dropdown
      trigger="click"
      position="bottomRight"
      visible={visible}
      onVisibleChange={setVisible}
      render={<Dropdown.Menu>{menuItems}</Dropdown.Menu>}
    >
      <Button
        className="lx-role-row__more"
        theme="borderless"
        size="small"
        icon={<IconMore size={16} />}
        aria-label={`${role.name} 更多操作`}
      />
    </Dropdown>
  );
}

function ListBody({
  roles,
  loading,
  error,
  selectedRoleId,
  canManage,
  showRowMenu,
  isFiltered,
  onSelect,
  onRowAction,
  onCreate,
  onResetFilters,
  onRetry,
}: Pick<
  RoleListPanelProps,
  | 'roles'
  | 'loading'
  | 'error'
  | 'selectedRoleId'
  | 'canManage'
  | 'showRowMenu'
  | 'isFiltered'
  | 'onSelect'
  | 'onRowAction'
  | 'onCreate'
  | 'onResetFilters'
  | 'onRetry'
>): ReactNode {
  if (loading) {
    return (
      <div className="lx-role-list__state" aria-busy="true">
        <Skeleton placeholder={<Skeleton.Paragraph rows={9} />} loading />
      </div>
    );
  }
  if (error !== null) {
    return (
      <ErrorState
        className="lx-role-list__state"
        title="角色列表加载失败"
        message={error.message}
        onRetry={onRetry}
      />
    );
  }
  if (roles.length === 0) {
    if (isFiltered) {
      return (
        <PageEmpty
          title="没有匹配的角色"
          description="换个角色名称、编码或说明再试，也可以清除当前筛选。"
          action={<Button onClick={onResetFilters}>清除筛选</Button>}
        />
      );
    }
    return (
      <PageEmpty
        title="还没有自定义角色"
        description="内置角色由系统维护不可删除；可按岗位新建自定义角色并分配权限。"
        action={
          <Button theme="solid" type="primary" onClick={onCreate}>
            新建角色
          </Button>
        }
      />
    );
  }
  return (
    <ul className="lx-role-list__items" role="listbox" aria-label="角色">
      {roles.map((role) => {
        const selected = role.id === selectedRoleId;
        return (
          <li key={role.id}>
            <div
              role="option"
              aria-selected={selected}
              tabIndex={0}
              className={[
                'lx-role-row',
                selected ? 'is-selected' : '',
                role.status === 'disabled' ? 'is-disabled' : '',
              ]
                .filter((item) => item !== '')
                .join(' ')}
              onClick={() => {
                onSelect(role.id);
              }}
              onKeyDown={(event) => {
                if (event.key === 'Enter' || event.key === ' ') {
                  event.preventDefault();
                  onSelect(role.id);
                }
              }}
            >
              <span className="lx-role-row__icon" aria-hidden="true">
                <IconShield size={16} />
              </span>
              <span className="lx-role-row__main">
                <span className="lx-role-row__name">
                  <RoleStatusTag status={role.status} dotOnly />
                  <b>{role.name}</b>
                  {role.isSystem ? (
                    <span className="lx-role-tag lx-role-tag--builtin">内置</span>
                  ) : null}
                  {role.status === 'disabled' ? <span className="lx-role-tag">停用</span> : null}
                </span>
                <span className="lx-role-row__meta">
                  {role.code}
                  <span className="lx-role-row__dot">·</span>
                  {scopeLabelOf(role.dataScope.type)}
                </span>
              </span>
              <span className="lx-role-row__side">
                <span className="lx-role-row__perm">{rolePermissionText(role)}</span>
                <span className="lx-role-row__users">{role.userCount} 人绑定</span>
              </span>
              {showRowMenu ? (
                <span
                  className="lx-role-row__menu"
                  onClick={(event) => {
                    event.stopPropagation();
                  }}
                >
                  <RowMenu role={role} canManage={canManage} onRowAction={onRowAction} />
                </span>
              ) : null}
            </div>
          </li>
        );
      })}
    </ul>
  );
}

/** 左侧角色列表卡：卡头说明 + 列表 / 三态 + 页脚统计 */
export function RoleListPanel(props: RoleListPanelProps): ReactNode {
  return (
    <section className="lx-role-list" aria-label="角色列表">
      <header className="lx-role-list__head">
        <span className="lx-role-list__title">角色</span>
        <span className="lx-role-list__note">{props.note}</span>
      </header>
      <div className="lx-role-list__body">
        <ListBody {...props} />
      </div>
      <footer className="lx-role-list__foot">
        <span className="lx-role-list__range">共 {props.roles.length} 个角色</span>
        <span className="lx-role-list__foot-note">
          {props.footerNote ??
            `启用 ${String(props.roles.filter((role) => role.status === 'active').length)} · 停用 ${String(props.roles.filter((role) => role.status === 'disabled').length)}`}
        </span>
      </footer>
    </section>
  );
}