import { useCallback, useEffect, useMemo, useState } from 'react'
import { fetchWithRefresh } from '../../lib/api'
import { crmUrl } from '../../lib/endpoints'
import EfficiencyScatter from './EfficiencyScatter'
import DistanceStrip from './DistanceStrip'
import DriverHistoryLine from './DriverHistoryLine'
import './DriverDailyStat.css'

const POLL_MS = 5 * 60 * 1000 // 5분

const localToday = () => {
  const d = new Date()
  return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')}`
}
const asList = (json) => (Array.isArray(json) ? json : (json?.data ?? []))
const asObject = (json) => (json?.data ?? json ?? null)

export default function DriverDailyStatPage() {
  const [date, setDate] = useState(localToday())
  const [driverId, setDriverId] = useState('') // '' = 선택 안 함
  const [rows, setRows] = useState([])
  const [history, setHistory] = useState(null)
  const [ovLoading, setOvLoading] = useState(true)
  const [histLoading, setHistLoading] = useState(false)
  const [error, setError] = useState(null)
  const [updatedAt, setUpdatedAt] = useState(null)

  // 개요(전체) — 날짜에만 의존. 드라이버 선택은 여기 안 건드림.
  const loadOverview = useCallback(async (signal) => {
    try {
      const res = await fetchWithRefresh(crmUrl(`/driver-daily-stat?date=${date}`))
      if (!res.ok) throw new Error(`개요 요청 실패 (${res.status})`)
      const list = asList(await res.json())
      if (signal?.aborted) return
      setRows(list)
      setUpdatedAt(new Date())
      setError(null)
    } catch (e) {
      if (!signal?.aborted) setError(e.message)
    } finally {
      if (!signal?.aborted) setOvLoading(false)
    }
  }, [date])

  useEffect(() => {
    const ctrl = new AbortController()
    setOvLoading(true)
    loadOverview(ctrl.signal)
    const id = setInterval(() => loadOverview(ctrl.signal), POLL_MS)
    return () => { ctrl.abort(); clearInterval(id) }
  }, [loadOverview])

  // 드릴다운(단일 드라이버) — 선택됐을 때만, 아래에 따로.
  const loadHistory = useCallback(async (signal) => {
    if (!driverId) { setHistory(null); return }
    try {
      setHistLoading(true)
      const res = await fetchWithRefresh(crmUrl(`/driver-daily-stat/history?driverId=${driverId}&date=${date}`))
      if (!res.ok) throw new Error(`이력 요청 실패 (${res.status})`)
      const h = asObject(await res.json())
      if (signal?.aborted) return
      setHistory(h)
    } catch (e) {
      if (!signal?.aborted) setError(e.message)
    } finally {
      if (!signal?.aborted) setHistLoading(false)
    }
  }, [date, driverId])

  useEffect(() => {
    const ctrl = new AbortController()
    loadHistory(ctrl.signal)
    const id = setInterval(() => loadHistory(ctrl.signal), POLL_MS)
    return () => { ctrl.abort(); clearInterval(id) }
  }, [loadHistory])

  const drivers = useMemo(() => {
    const seen = new Map()
    for (const r of rows) {
      if (r.ddsDriverId != null && !seen.has(r.ddsDriverId)) {
        seen.set(r.ddsDriverId, r.ddsMainDriver ?? `드라이버 ${r.ddsDriverId}`)
      }
    }
    return [...seen.entries()].map(([id, name]) => ({ id, name }))
  }, [rows])

  const selectedName = drivers.find((d) => String(d.id) === String(driverId))?.name

  // 픽업 있음(산점도) / 픽업 0(칩) 분리
  const activeRows = useMemo(() => rows.filter((r) => Number(r.ddsTotalQty ?? 0) > 0), [rows])
  const zeroRows = useMemo(() => rows.filter((r) => Number(r.ddsTotalQty ?? 0) <= 0), [rows])

  // 전체 요약 (선택과 무관, 날짜 기준 전체 합)
  const summary = useMemo(() => {
    let plannedQty = 0, totalQty = 0, completed = 0, target = 0
    for (const r of rows) {
      plannedQty += Number(r.ddsPlannedQty ?? 0)
      totalQty += Number(r.ddsTotalQty ?? 0)
      completed += Number(r.ddsCompletedCount ?? 0)
      target += Number(r.ddsPlannedCount ?? 0)
    }
    const rate = plannedQty > 0 ? Math.round((totalQty / plannedQty) * 100) : null
    return {
      plannedQty: Math.round(plannedQty),
      totalQty: Math.round(totalQty),
      completed,
      target,
      rate,
    }
  }, [rows])

  return (
    <div>
      <div className="dstat-head">
        <h2 className="dstat-title">드라이버 운행 현황</h2>
        <span className="dstat-sub">
          <span className="dstat-dot">●</span>
          5분마다 자동 갱신
          {updatedAt && ` · 업데이트 ${updatedAt.toLocaleTimeString('ko-KR', { hour: '2-digit', minute: '2-digit' })}`}
          {ovLoading && rows.length > 0 && ' · 갱신 중…'}
        </span>
      </div>

      <div className="dstat-filters">
        <div className="dstat-field">
          <label htmlFor="dstat-date">날짜</label>
          <input id="dstat-date" type="date" className="dstat-input"
            value={date} onChange={(e) => setDate(e.target.value)} />
        </div>
        <div className="dstat-field">
          <label htmlFor="dstat-driver">드라이버</label>
          <select id="dstat-driver" className="dstat-select"
            value={driverId} onChange={(e) => setDriverId(e.target.value)}>
            <option value="">선택 안 함</option>
            {drivers.map((d) => (
              <option key={d.id} value={d.id}>{d.name}</option>
            ))}
          </select>
        </div>
      </div>

      {error && <div className="dstat-msg error">불러오기 오류: {error}</div>}
      {ovLoading && rows.length === 0 && <div className="dstat-msg">불러오는 중…</div>}

      {/* 전체 요약 */}
      {rows.length > 0 && (
        <div className="dstat-summary">
          <div className="dstat-sumcard">
            <div className="k">전체 예상량</div>
            <div className="v">{summary.plannedQty.toLocaleString()} <span className="u">L</span></div>
          </div>
          <div className="dstat-sumcard primary">
            <div className="k">전체 픽업량</div>
            <div className="v">{summary.totalQty.toLocaleString()} <span className="u">L</span></div>
            {summary.rate != null && <div className="sub">예상 대비 {summary.rate}%</div>}
          </div>
          <div className="dstat-sumcard">
            <div className="k">전체 방문 수</div>
            <div className="v">
              {summary.completed.toLocaleString()} <span className="u">/ {summary.target.toLocaleString()}</span>
            </div>
          </div>
        </div>
      )}

      {/* 전체 개요 — 선택과 무관하게 항상 유지 */}
      {(!ovLoading || rows.length > 0) && (
        <div className="dstat-card">
          <div className="dstat-card-head">
            <span className="dstat-card-title">전체 드라이버 — 거리 대비 픽업량</span>
          </div>
          <EfficiencyScatter
            rows={activeRows}
            selectedId={driverId || null}
            onSelect={(id) => setDriverId(String(id))}
          />
          <div className="dstat-legend">
            <span className="item">
              <svg width="18" height="16">
                <clipPath id="lgRun"><circle cx="9" cy="8" r="6" /></clipPath>
                <circle cx="9" cy="8" r="6" fill="#eef3ef" />
                <rect x="3" y="9" width="12" height="6" fill="#2e7d32" clipPath="url(#lgRun)" />
                <circle cx="9" cy="8" r="6" fill="none" stroke="#2e7d32" strokeWidth="1.4" />
              </svg>운행 중
            </span>
            <span className="item">
              <svg width="20" height="16">
                <clipPath id="lgEnd"><circle cx="9" cy="8" r="6" /></clipPath>
                <circle cx="9" cy="8" r="6" fill="#eef3ef" />
                <rect x="3" y="6" width="12" height="9" fill="#2e7d32" clipPath="url(#lgEnd)" />
                <circle cx="9" cy="8" r="6" fill="none" stroke="#2e7d32" strokeWidth="1.4" />
                <circle cx="14" cy="3.5" r="3" fill="#2e7d32" stroke="#fff" strokeWidth="0.8" />
                <path d="M12.7 3.5 l0.9 0.9 l1.6 -1.9" fill="none" stroke="#fff" strokeWidth="0.9" strokeLinecap="round" strokeLinejoin="round" />
              </svg>운행 종료
            </span>
            <span>채움 = 예상 대비 픽업량 · 마커 클릭 → 아래에 누적 차트</span>
          </div>
        </div>
      )}

      {/* 기타 운행 (오일 픽업 없음) — 거리 스트립 */}
      {zeroRows.length > 0 && (
        <div className="dstat-card" style={{ marginTop: 16 }}>
          <div className="dstat-card-head">
            <span className="dstat-card-title">기타 운행 (오일 픽업 없음) — 이동거리</span>
          </div>
          <DistanceStrip rows={zeroRows} />
        </div>
      )}

      {/* 단일 드라이버 드릴다운 — 아래에 추가로 등장 */}
      {driverId && (
        <div className="dstat-card" style={{ marginTop: 16 }}>
          <div className="dstat-card-head">
            <span className="dstat-card-title">
              {selectedName} · 시간대별 누적{histLoading && ' · 불러오는 중…'}
            </span>
            <button className="dstat-btn ghost" onClick={() => setDriverId('')}>닫기 ✕</button>
          </div>
          <DriverHistoryLine history={history} />
        </div>
      )}
    </div>
  )
}