import React, { useEffect, useState } from 'react';
import { Modal, Input, Row, Col, Spin, message } from 'antd';
import type { ModalProps } from 'antd';
import { request } from '@umijs/max';

interface JobTitle {
  id: number;
  label: string;
  children?: JobTitle[];
}

export interface JobTitleSelectorProps extends Omit<ModalProps, 'onOk'|'onCancel'> {
  open: boolean;
  value?: {id:number, label:string};
  onOk: (job: {id:number, label:string})=>void;
  onCancel: ()=>void;
}

const JobTitleSelector: React.FC<JobTitleSelectorProps> = ({ open, onOk, onCancel, value }) => {
  const [loading, setLoading] = useState(false);
  const [data, setData] = useState<JobTitle[]>([]);
  const [search, setSearch] = useState('');
  const [filtered, setFiltered] = useState<JobTitle[]>([]); // 筛选后数据
  const [selectedCat, setSelectedCat] = useState<JobTitle|null>(null); // 左列选中一级
  const [showSubId, setShowSubId] = useState<number|null>(null);       // 右列当前展开二级ID
  const [selected, setSelected] = useState<{id:number, label:string}|null>(value||null);

  useEffect(()=>{
    if(open){
      setLoading(true);
      request('/api/app/common/jobTitle/treeselect').then(res=>{
        setData(res.data||[]);
        setFiltered(res.data||[]);
        setSelectedCat(null);
        setShowSubId(null);
        setSelected(value||null);
        setSearch('');
      }).catch(()=>message.error('加载岗位数据失败')).finally(()=>setLoading(false));
    }
  },[open]);

  // 搜索时过滤全部三级，依然保持原树结构
  useEffect(()=>{
    if(search&&search.length>0){
      // 返回新的树，只在三级岗位匹配关键词的二/一级保留
      function filterTree(nodes:JobTitle[]):JobTitle[]{
        return nodes.map(cat=>{
          // cat: 一级
          if(!cat.children)return null;
          const subFiltered=cat.children.map(sub=>{
            if(!sub.children)return null;
            const jobs=sub.children.filter(j=>j.label.includes(search));
            if(jobs.length>0){ return {...sub,children:jobs}; }
            return null;
          }).filter(Boolean) as JobTitle[];
          if(subFiltered.length>0)return {...cat,children:subFiltered};
          return null;
        }).filter(Boolean) as JobTitle[];
      }
      setFiltered(filterTree(data));
      setSelectedCat(null);
      setShowSubId(null);
    }else{
      setFiltered(data);
    }
  },[search,data]);

  // 左列，一级点击切换
  const handleCat = (cat:JobTitle) => {
    setSelectedCat(cat); setShowSubId(null);
  };
  // 右列，点二级分类
  const handleSub = (sub:JobTitle) => {
    setShowSubId(sub.id===showSubId?null:sub.id);
  };
  // 右列，选三级岗位
  const handleJob = (job:JobTitle) => {
    setSelected({id:job.id,label:job.label});
  };
  const handleOk = () => {
    if(selected){ onOk(selected); } else { message.warning('请选择岗位'); }
  };

  // 获取当前分类下所有二级
  const curSubs = selectedCat?.children || [];

  // 搜索时过滤所有二级岗位的分组，全局（不再依赖selectedCat）
  const getGlobalSearchGroups = ()=>{
    if (!search) return [];
    const groups: {cat:JobTitle, sub: JobTitle, jobs: JobTitle[]}[] = [];
    data.forEach(cat=>{
      cat.children?.forEach(sub=>{
        if(sub.children){
          const jobs=sub.children.filter(j=>j.label.includes(search));
          if(jobs.length>0)groups.push({cat,sub,jobs});
        }
      });
    });
    return groups;
  };

  return (
    <Modal open={open} width={800} onCancel={onCancel} onOk={handleOk} title="请选择岗位名称" okText="确定" cancelText="取消">
      <Spin spinning={loading}>
        <Input
          placeholder="请输入职位关键词"
          allowClear
          value={search}
          onChange={e=>setSearch(e.target.value)}
          style={{marginBottom:10,width:280}}
        />
        <div style={{display:'flex',minHeight:410, maxHeight:520, overflow:'hidden'}}>
          {/* 左侧一级分类 */}
          <div style={{width:180,borderRight:'1px solid #f0f0f0',overflowY:'auto',paddingTop:2,maxHeight:500}}>
            {filtered.map(cat=>(
              <div
                key={cat.id}
                style={{padding:'10px 16px', cursor:'pointer', background:selectedCat?.id===cat.id?'#e6f7ff':'', fontWeight:selectedCat?.id===cat.id?'bold':undefined}}
                onClick={()=>handleCat(cat)}
              >{cat.label}</div>
            ))}
          </div>
          {/* 右侧内容区优化 */}
          <div style={{flex:1, padding:'16px 20px 10px 20px', minHeight:380, maxHeight:500,overflowY:'auto'}}>
            {(search) ? (
              (()=>{
                const groups = getGlobalSearchGroups();
                return groups.length===0?
                  <div style={{color:'#bbb',textAlign:'center'}}>无相关岗位</div>:
                  groups.map(({cat,sub,jobs})=>(
                    <div key={cat.id+'-'+sub.id} style={{marginBottom:16}}>
                      <div style={{fontWeight:600,margin:'4px 0'}}>
                        {cat.label} / {sub.label}
                      </div>
                      <div style={{display:'flex',flexWrap:'wrap',flexDirection:'row',gap:'8px 6px',marginTop: 8}}>
                        {jobs.map(job=>(
                          <div key={job.id}
                            style={{padding:'6px 18px',borderRadius:16,background:selected?.id===job.id?'#1890ff':'#f6f6f6',color:selected?.id===job.id?'#fff':'#222',cursor:'pointer',whiteSpace:'nowrap',fontSize:14}}
                            onClick={()=>handleJob(job)}
                          >{job.label}</div>
                        ))}
                      </div>
                    </div>
                  ));
              })()
            ) : (
              !selectedCat?
                <div style={{color:'#bbb',padding:'100px 0',textAlign:'center'}}>请先选择左侧所属行业类别</div>:
                <div>
                  {curSubs.length===0?
                    <div style={{color:'#bbb',textAlign:'center'}}>暂无子分类</div>:
                    <div style={{overflow:'visible',maxWidth:'100%'}}>
                      <div style={{display:'flex',flexWrap:'wrap',paddingBottom:12,gap:'0 36px'}}>
                        {curSubs.map(sub=>(
                          <div key={sub.id} style={{marginBottom:16, minWidth:150}}>
                            <div
                              style={{display:'flex',alignItems:'center', cursor:sub.children?'pointer':'default',fontWeight:600,padding:'4px 0',color:showSubId===sub.id?'#1890ff':'#333'}}
                              onClick={()=>sub.children&&handleSub(sub)}
                            >
                              <span>{sub.label}</span>
                              {sub.children && (
                                <span style={{fontSize:20, color:'#999', marginLeft:4, fontWeight:'bold'}}>
                                  {showSubId===sub.id?'－':'＋'}
                                </span>
                              )}
                            </div>
                            {/* 只在当前展开的二级下 横向显示三级 */}
                            {showSubId===sub.id&&sub.children&&(
                              <div style={{display:'flex',flexWrap:'wrap',flexDirection:'row',gap:'8px 6px',marginTop: 8}}>
                                {sub.children.map(job=>(
                                  <div key={job.id}
                                    style={{padding:'6px 18px',borderRadius:16,background:selected?.id===job.id?'#1890ff':'#f6f6f6',color:selected?.id===job.id?'#fff':'#222',cursor:'pointer',whiteSpace:'nowrap',fontSize:14}}
                                    onClick={()=>handleJob(job)}
                                  >{job.label}</div>
                                ))}
                              </div>
                            )}
                          </div>
                        ))}
                      </div>
                    </div>
                  }
                </div>
            )}
          </div>
        </div>
      </Spin>
    </Modal>
  );
};
export default JobTitleSelector;