import { queryDepartTreeSync, getUserList } from '/@/api/common/api';

interface NameFieldConfig {
  /** Names 后缀的基础字段名，如 'measureResDept' → 写入 target['measureResDeptNames'] */
  field: string;
  /** 'dept' | 'user' */
  type: 'dept' | 'user';
  /** 自定义取值器，默认读取 target[field] */
  getValue?: () => string;
}

function flatDeptTree(list: any[]): Record<string, string> {
  const map: Record<string, string> = {};
  for (const item of list) {
    if (item.id && item.departName) {
      map[item.id] = item.departName;
    }
    if (item.children?.length) {
      Object.assign(map, flatDeptTree(item.children));
    }
  }
  return map;
}

/**
 * 选人/选部门字段名称翻译器。
 * - resolveAll() 通过 API 批量翻译，在表单数据加载后调用
 * - selectHandler(field) 生成 @select 事件处理器，用于运行时更新
 */
export function useSelectNameResolver(
  target: Record<string, any>,
  configs: NameFieldConfig[]
) {
  async function resolveAll() {
    try {
      const deptConfigs = configs.filter(c => c.type === 'dept');
      const userConfigs = configs.filter(c => c.type === 'user');

      if (deptConfigs.length) {
        // 收集所有 dept IDs
        const allDeptIds = new Set<string>();
        for (const c of deptConfigs) {
          const val = c.getValue ? c.getValue() : target[c.field];
          const ids = String(val || '').split(',').map((s: string) => s.trim()).filter(Boolean);
          ids.forEach(id => allDeptIds.add(id));
        }
        if (allDeptIds.size) {
          const tree = await queryDepartTreeSync({ ids: [...allDeptIds].join(',') });
          const deptMap = flatDeptTree(tree || []);
          for (const c of deptConfigs) {
            const val = c.getValue ? c.getValue() : target[c.field];
            const ids = String(val || '').split(',').map((s: string) => s.trim()).filter(Boolean);
            target[c.field + 'Names'] = ids.map(id => deptMap[id] || id).join('、');
          }
        }
      }

      if (userConfigs.length) {
        const allUserIds = new Set<string>();
        for (const c of userConfigs) {
          const val = c.getValue ? c.getValue() : target[c.field];
          const ids = String(val || '').split(',').map((s: string) => s.trim()).filter(Boolean);
          ids.forEach(id => allUserIds.add(id));
        }
        if (allUserIds.size) {
          const idList = [...allUserIds];
          const userMap: Record<string, string> = {};

          // 先按 id 查
          const idRes = await getUserList({ id: idList.join(','), isMultiTranslate: 'true', pageNo: 1, pageSize: 999 });
          const idRecords = idRes?.records || idRes?.result?.records || [];
          for (const u of idRecords) {
            if (u.id && u.realname) userMap[String(u.id)] = u.realname;
            if (u.username && u.realname) userMap[u.username] = u.realname;
          }

          // 未匹配到的再按 username 查
          const unmatched = idList.filter(id => !userMap[id]);
          if (unmatched.length) {
            const nameRes = await getUserList({ username: unmatched.join(','), isMultiTranslate: 'true', pageNo: 1, pageSize: 999 });
            const nameRecords = nameRes?.records || nameRes?.result?.records || [];
            for (const u of nameRecords) {
              if (u.username && u.realname) userMap[u.username] = u.realname;
            }
          }

          for (const c of userConfigs) {
            const val = c.getValue ? c.getValue() : target[c.field];
            const ids = String(val || '').split(',').map((s: string) => s.trim()).filter(Boolean);
            target[c.field + 'Names'] = ids.map(id => userMap[id] || id).join('、');
          }
        }
      }
    } catch (e) {
      console.warn('【Name解析】resolveAll 翻译失败，占位符将显示 ID:', e);
    }
  }

  function selectHandler(field: string) {
    const cfg = configs.find(c => c.field === field);
    const nameKey = cfg?.type === 'user' ? 'realname' : cfg?.type === 'dept' ? 'departName' : 'label';
    return (options: Array<Record<string, any>>) => {
      target[field + 'Names'] = options?.length ? options.map(o => o[nameKey] || o.label || '').join('、') : '';
    };
  }

  return { resolveAll, selectHandler };
}