/* eslint-disable max-lines-per-function -- 详情面板按头部/摘要/范围/特殊/绑定用户分区，集中便于对齐原型 */
import { Button } from '@douyinfe/semi-ui-19';
import type { PermissionTree, RoleDetail } from '@lingxi/shared';
import { ErrorState, PageEmpty, PageSkeleton } from '@lingxi/ui';
import {
  IconCopy,
  IconEdit,
  IconPause,
  IconPlay,
  IconShield,
  IconStar,
  IconView,
} from '@lingxi/ui/icons';
import type { ReactNode } from 'react';
import { useState } from 'react';

import {
  buildPermissionMetaMap,
  formatRoleDateTime,
  permissionNameOf,
  scopeDescriptionOf,
  scopeLabelOf,
  summarizePermissionModules,
} from './role-display';
import { RoleStatusTag } from './RoleStatusTag';

export interface RoleDetailPanelProps {
  roleId: string | null;
  detail: RoleDetail | undefined;
  tree: PermissionTree | undefined;
  loading: boolean;
  error: Error | null;
  canManage: boolean;
  onRetry: () => void;
  onEdit: (roleId: string) => void;
  onCopy: (role: RoleDetail) => void;
  onRename: (role: RoleDetail) => void;
  onDisable: (role: RoleDetail) => void;
  onEnable: (role: RoleDetail) => void;
}

function RoleAvatar({ status }: { status: 'active' | 'disabled' }): ReactNode {
  return (
    <span
      className={
        status === 'active' ? 'lx-role-detail__avatar' : 'lx-role-detail__avatar is-disabled'
      }
      aria-hidden="true"
    >
      <IconShield size={22} />
    </span>
  );
}

function DetailHead({
  role,
  canManage,
  onEdit,
  onCopy,
  onRename,
  onDisable,
  onEnable,
}: Pick<
  RoleDetailPanelProps,
  'canManage' | 'onEdit' | 'onCopy' | 'onRename' | 'onDisable' | 'onEnable'
> & {
  role: RoleDetail;
}): ReactNode {
  return (
    <header className="lx-role-detail__head">
      <RoleAvatar status={role.status} />
      <div className="lx-role-detail__ident">
        <div className="lx-role-detail__name">
          <h2>{role.name}</h2>
          <RoleStatusTag status={role.status} />
          {role.isSystem ? <span className="lx-role-tag lx-role-tag--builtin">内置</span> : null}
        </div>
        <p className="lx-role-detail__desc">{role.description}</p>
      </div>
      <div className="lx-role-detail__actions">
        {canManage ? (
          <>
            <Button
              icon={<IconCopy size={14} />}
              onClick={() => {
                onCopy(role);
              }}
            >
              复制
            </Button>
            {role.isSystem ? (
              <Button
                icon={<IconEdit size={14} />}
                onClick={() => {
                  onRename(role);
                }}
              >
                改名
              </Button>
            ) : role.status === 'active' ? (
              <Button
                type="danger"
                icon={<IconPause size={14} />}
                onClick={() => {
                  onDisable(role);
                }}
              >
                停用
              </Button>
            ) : (
              <Button
                icon={<IconPlay size={14} />}
                onClick={() => {
                  onEnable(role);
                }}
              >
                启用
              </Button>
            )}
          </>
        ) : null}
        <Button
          theme="solid"
          type="primary"
          icon={canManage && !role.isSystem ? <IconEdit size={14} /> : <IconView size={14} />}
          onClick={() => {
            onEdit(role.id);
          }}
        >
          {canManage && !role.isSystem ? '编辑角色' : '查看角色'}
        </Button>
      </div>
    </header>
  );
}

function PermissionSummary({
  role,
  tree,
}: {
  role: RoleDetail;
  tree: PermissionTree | undefined;
}): ReactNode {
  const selected = [...role.permissions, ...role.specialPermissions];
  const modules = tree === undefined ? [] : summarizePermissionModules(tree, selected);
  return (
    <section className="lx-role-detail__section">
      <div className="lx-role-detail__section-head">
        <h3>权限点摘要</h3>
        <span className="lx-role-detail__count">
          已选 {role.permissionCount + role.specialPermissionCount} /{' '}
          {tree?.totalPermissions ?? '—'}
        </span>
      </div>
      {modules.length === 0 ? (
        <p className="lx-role-detail__muted">权限点目录加载中…</p>
      ) : (
        <div className="lx-role-detail__modules">
          {modules.map((module) => (
            <div
              key={module.module}
              className={
                module.selected === 0 ? 'lx-role-detail__module is-zero' : 'lx-role-detail__module'
              }
            >
              <span className="lx-role-detail__module-name">{module.moduleLabel}</span>
              <span className="lx-role-detail__module-count">
                <b>{module.selected}</b> / {module.total}
              </span>
            </div>
          ))}
        </div>
      )}
    </section>
  );
}

function ScopeAndSpecial({
  role,
  tree,
}: {
  role: RoleDetail;
  tree: PermissionTree | undefined;
}): ReactNode {
  const meta = tree === undefined ? undefined : buildPermissionMetaMap(tree);
  return (
    <section className="lx-role-detail__section">
      <div className="lx-role-detail__cols">
        <div className="lx-role-detail__col">
          <div className="lx-role-detail__section-head">
            <h3>数据范围</h3>
          </div>
          <p className="lx-role-detail__scope">
            <b>{scopeLabelOf(role.dataScope.type)}</b>
            <span>{scopeDescriptionOf(role.dataScope.type)}</span>
          </p>
          {role.dataScope.type === 'customer_groups' ? (
            <p className="lx-role-detail__muted">
              {(role.dataScope.targetIds ?? []).length === 0
                ? '暂未指定客户组，客户组将在客户模块上线后可选择。'
                : `已指定 ${String((role.dataScope.targetIds ?? []).length)} 个客户组，客户组名称将在客户模块上线后展示。`}
            </p>
          ) : null}
        </div>
        <div className="lx-role-detail__col">
          <div className="lx-role-detail__section-head">
            <h3>特殊权限</h3>
            <span className="lx-role-detail__count">{role.specialPermissions.length} / 6</span>
          </div>
          {role.specialPermissions.length === 0 ? (
            <p className="lx-role-detail__muted">
              未授予特殊权限，6 项均默认关闭，需单独授予并记录审计。
            </p>
          ) : (
            <div className="lx-role-detail__special-chips">
              {role.specialPermissions.map((code) => (
                <span key={code} className="lx-role-detail__special-chip" title={code}>
                  <IconStar size={12} />
                  {meta === undefined ? code : permissionNameOf(meta, code)}
                </span>
              ))}
            </div>
          )}
        </div>
      </div>
    </section>
  );
}

function BoundUsers({ role }: { role: RoleDetail }): ReactNode {
  const [expanded, setExpanded] = useState(false);
  const shown = expanded ? role.boundUsers : role.boundUsers.slice(0, 3);
  return (
    <section className="lx-role-detail__section">
      <div className="lx-role-detail__section-head">
        <h3>绑定用户</h3>
        {role.boundUsers.length > 3 ? (
          <Button
            theme="borderless"
            size="small"
            onClick={() => {
              setExpanded((value) => !value);
            }}
          >
            {expanded ? '收起' : `查看全部 ${String(role.boundUsers.length)} 名`}
          </Button>
        ) : null}
      </div>
      {role.boundUsers.length === 0 ? (
        <p className="lx-role-detail__muted">暂未绑定用户，可停用或删除该角色。</p>
      ) : (
        <ul className="lx-role-detail__users">
          {shown.map((user) => (
            <li key={user.id} className="lx-role-detail__user">
              <span
                className={
                  user.status === 'disabled'
                    ? 'lx-role-detail__user-avatar is-disabled'
                    : 'lx-role-detail__user-avatar'
                }
              >
                {user.name.slice(0, 1)}
              </span>
              <span className="lx-role-detail__user-name">{user.name}</span>
              <span className="lx-role-detail__user-account">{user.account}</span>
              <span className="lx-role-detail__user-dept">{user.departmentName}</span>
              <span
                className={
                  user.status === 'active' ? 'lx-status-tag is-active' : 'lx-status-tag is-disabled'
                }
              >
                {user.status === 'active' ? '在职' : '停用'}
              </span>
            </li>
          ))}
        </ul>
      )}
    </section>
  );
}

function DetailState({
  roleId,
  loading,
  error,
  onRetry,
}: Pick<RoleDetailPanelProps, 'roleId' | 'loading' | 'error' | 'onRetry'>): ReactNode {
  if (roleId === null) {
    return (
      <PageEmpty
        title="请选择一个角色"
        description="左侧列表支持搜索与状态筛选，选中角色后在此查看权限详情。"
      />
    );
  }
  if (loading) {
    return (
      <div className="lx-role-detail__state">
        <PageSkeleton rows={8} />
      </div>
    );
  }
  if (error !== null) {
    return (
      <ErrorState
        className="lx-role-detail__state"
        title="角色详情加载失败"
        message={error.message}
        onRetry={onRetry}
      />
    );
  }
  return null;
}

/** 右侧角色详情面板（只读）：权限摘要、数据范围、特殊权限、绑定用户与编辑入口 */
export function RoleDetailPanel(props: RoleDetailPanelProps): ReactNode {
  const ready = props.roleId !== null && props.detail !== undefined && props.error === null;
  const detail = props.detail;
  return (
    <section className="lx-role-detail" aria-label="角色详情">
      {ready && detail !== undefined ? (
        <>
          <DetailHead
            role={detail}
            canManage={props.canManage}
            onEdit={props.onEdit}
            onCopy={props.onCopy}
            onRename={props.onRename}
            onDisable={props.onDisable}
            onEnable={props.onEnable}
          />
          <div className="lx-role-detail__body">
            <div className="lx-role-detail__meta">
              <span>
                <em>编码</em>
                <code>{detail.code}</code>
              </span>
              <span>
                <em>绑定用户</em>
                {detail.userCount} 名
              </span>
              <span>
                <em>最近更新</em>
                {formatRoleDateTime(detail.updatedAt)}
              </span>
            </div>
            <PermissionSummary role={detail} tree={props.tree} />
            <ScopeAndSpecial role={detail} tree={props.tree} />
            <BoundUsers role={detail} />
          </div>
        </>
      ) : (
        <div className="lx-role-detail__empty">
          <DetailState
            roleId={props.roleId}
            loading={props.loading}
            error={props.error}
            onRetry={props.onRetry}
          />
        </div>
      )}
    </section>
  );
}