import React, { useEffect, useState } from 'react';
import { getListings, collectListings, getListingsCollectStatus } from '../../../api';
import { tierMeta, formatMoney, formatRatio } from '../listingsUtils';

const DEAL_TYPES = ['전체', '전세', '반전세', '매매'];

const ListingCard = ({ l }) => {
  const isSale = l.deal_type === '매매';
  const tv = isSale ? l.valuation_tier : l.safety_tier;
  const meta = tierMeta(isSale ? 'valuation' : 'safety', tv);
  const price = l.price ?? l.deposit ?? l.amount;
  const flags = Array.isArray(l.regulation_flags) ? l.regulation_flags : [];
  const reasons = Array.isArray(l.reasons) ? l.reasons : [];
  return (
    <div className="lst-card">
      <div className="lst-card__head">
        {tv && <span className="lst-tier" style={{ color: meta.color }}>{meta.emoji} {meta.label}</span>}
        <strong className="lst-card__name">{l.complex_name || l.name || l.dong || '(매물)'}</strong>
        {l.deal_type && <span className="lst-card__deal">{l.deal_type}</span>}
        {l.dong && <span className="lst-card__dong">{l.dong}</span>}
      </div>
      <div className="lst-card__body">
        {price != null && <span className="lst-card__price">{formatMoney(price)}</span>}
        {l.area != null && <span className="lst-card__area">{l.area}m²</span>}
        {l.ratio != null && <span className="lst-card__ratio">비율 {formatRatio(l.ratio)}</span>}
      </div>
      {flags.length > 0 && (
        <div className="lst-flags">{flags.map((f, i) => <span key={i} className="lst-flag">{f}</span>)}</div>
      )}
      {reasons.length > 0 && <div className="lst-card__reasons">{reasons.join(' · ')}</div>}
    </div>
  );
};

const ListingsTab = () => {
  const [listings, setListings] = useState([]);
  const [dealType, setDealType] = useState('전체');
  const [matchedOnly, setMatchedOnly] = useState(false);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState('');
  const [collectStatus, setCollectStatus] = useState(null);
  const [collecting, setCollecting] = useState(false);

  const load = async () => {
    setLoading(true);
    setError('');
    try {
      const data = await getListings({
        deal_type: dealType === '전체' ? undefined : dealType,
        matched_only: matchedOnly,
        size: 50,
      });
      setListings(Array.isArray(data) ? data : (data.listings ?? []));
    } catch (e) {
      setError(e?.message ?? String(e));
      setListings([]);
    } finally {
      setLoading(false);
    }
  };

  const loadStatus = async () => {
    try { setCollectStatus(await getListingsCollectStatus()); } catch { /* noop */ }
  };

  useEffect(() => { load(); }, [dealType, matchedOnly]); // eslint-disable-line react-hooks/exhaustive-deps
  useEffect(() => { loadStatus(); }, []);

  const handleCollect = async () => {
    setCollecting(true);
    setError('');
    const prevAt = collectStatus?.collected_at ?? null;
    try {
      await collectListings();
    } catch (e) {
      setError(e?.message ?? String(e));
      setCollecting(false);
      return;
    }
    let tries = 0;
    const poll = async () => {
      tries += 1;
      let st = null;
      try { st = await getListingsCollectStatus(); } catch { /* noop */ }
      if (st) setCollectStatus(st);
      const done = st && (st.collected_at !== prevAt || st.error);
      if (done || tries >= 12) {
        setCollecting(false);
        load();
        return;
      }
      window.setTimeout(poll, 5000);
    };
    window.setTimeout(poll, 5000);
  };

  return (
    <div className="lst-tab">
      <div className="lst-toolbar">
        <div className="lst-filter">
          {DEAL_TYPES.map((d) => (
            <button key={d} type="button" className={`lst-filter-btn ${dealType === d ? 'is-active' : ''}`}
              onClick={() => setDealType(d)}>{d}</button>
          ))}
        </div>
        <div className="lst-toolbar__right">
          <button type="button" className={`lst-filter-btn ${matchedOnly ? 'is-active' : ''}`}
            onClick={() => setMatchedOnly((v) => !v)}>매칭만</button>
          <button type="button" className="lst-filter-btn is-primary" onClick={handleCollect} disabled={collecting}>
            {collecting ? '수집 중…' : '수집 실행'}
          </button>
        </div>
      </div>

      {collectStatus && (
        <p className="lst-status">
          수집 상태: {collectStatus.status === 'never_run' ? '미실행' : collectStatus.status}
          {collectStatus.total_count != null && ` · 총 ${collectStatus.total_count}건`}
          {collectStatus.error && <span style={{ color: '#f87171' }}> · 오류: {collectStatus.error}</span>}
        </p>
      )}

      {error && <p className="lst-error">{error}</p>}

      {loading ? (
        <p className="lst-empty">불러오는 중…</p>
      ) : listings.length === 0 ? (
        <p className="lst-empty">조건에 맞는 매물이 없습니다. ‘수집 실행’으로 매물을 모아보세요.</p>
      ) : (
        <div className="lst-grid">
          {listings.map((l) => <ListingCard key={l.id ?? `${l.complex_name}-${l.dong}`} l={l} />)}
        </div>
      )}
    </div>
  );
};

export default ListingsTab;