import { useState, useCallback, useRef, useEffect } from 'react'
import { fetchAerialMedia } from '../services/aerialApi'
import type { AerialMediaItem } from '../services/aerialApi'

// ── Helpers ──

function formatDtm(dtm: string | null): string {
  if (!dtm) return '—'
  const d = new Date(dtm)
  return d.toISOString().slice(0, 16).replace('T', ' ')
}

const equipIcon = (t: string) => t === 'drone' ? '🛸' : t === 'plane' ? '✈' : '🛰'

const equipTagCls = (t: string) =>
  t === 'drone'
    ? 'bg-[rgba(59,130,246,0.12)] text-primary-blue'
    : t === 'plane'
      ? 'bg-[rgba(34,197,94,0.12)] text-status-green'
      : 'bg-[rgba(168,85,247,0.12)] text-primary-purple'

const mediaTagCls = (t: string) =>
  t === '영상'
    ? 'bg-[rgba(239,68,68,0.12)] text-status-red'
    : 'bg-[rgba(234,179,8,0.12)] text-status-yellow'

const FilterBtn = ({ label, active, onClick }: { label: string; active: boolean; onClick: () => void }) => (
  <button
    onClick={onClick}
    className={`px-2.5 py-1 text-[10px] font-semibold rounded font-korean transition-colors ${
      active
        ? 'bg-[rgba(6,182,212,0.15)] text-primary-cyan border border-primary-cyan/30'
        : 'bg-bg-3 border border-border text-text-2 hover:bg-bg-hover'
    }`}
  >
    {label}
  </button>
)

// ── Component ──

export function MediaManagement() {
  const [mediaItems, setMediaItems] = useState<AerialMediaItem[]>([])
  const [loading, setLoading] = useState(true)
  const [selectedIds, setSelectedIds] = useState<Set<number>>(new Set())
  const [equipFilter, setEquipFilter] = useState<string>('all')
  const [typeFilter, setTypeFilter] = useState<Set<string>>(new Set())
  const [searchTerm, setSearchTerm] = useState('')
  const [sortBy, setSortBy] = useState('latest')
  const [showUpload, setShowUpload] = useState(false)
  const modalRef = useRef<HTMLDivElement>(null)

  const loadData = useCallback(async () => {
    setLoading(true)
    try {
      const items = await fetchAerialMedia()
      setMediaItems(items)
    } catch (err) {
      console.error('[aerial] 미디어 목록 조회 실패:', err)
    } finally {
      setLoading(false)
    }
  }, [])

  useEffect(() => {
    loadData()
  }, [loadData])

  useEffect(() => {
    const handler = (e: MouseEvent) => {
      if (modalRef.current && !modalRef.current.contains(e.target as Node)) {
        setShowUpload(false)
      }
    }
    if (showUpload) document.addEventListener('mousedown', handler)
    return () => document.removeEventListener('mousedown', handler)
  }, [showUpload])

  const filtered = mediaItems.filter(f => {
    if (equipFilter !== 'all' && f.equipTpCd !== equipFilter) return false
    if (typeFilter.size > 0) {
      const isPhoto = f.mediaTpCd !== '영상'
      const isVideo = f.mediaTpCd === '영상'
      if (typeFilter.has('photo') && !isPhoto) return false
      if (typeFilter.has('video') && !isVideo) return false
    }
    if (searchTerm && !f.fileNm.toLowerCase().includes(searchTerm.toLowerCase())) return false
    return true
  })

  const sorted = [...filtered].sort((a, b) => {
    if (sortBy === 'name') return a.fileNm.localeCompare(b.fileNm)
    if (sortBy === 'size') return parseFloat(b.fileSz ?? '0') - parseFloat(a.fileSz ?? '0')
    return (b.takngDtm ?? '').localeCompare(a.takngDtm ?? '')
  })

  const toggleId = (id: number) => {
    setSelectedIds(prev => {
      const next = new Set(prev)
      if (next.has(id)) { next.delete(id) } else { next.add(id) }
      return next
    })
  }

  const toggleAll = () => {
    if (selectedIds.size === sorted.length) {
      setSelectedIds(new Set())
    } else {
      setSelectedIds(new Set(sorted.map(f => f.aerialMediaSn)))
    }
  }

  const toggleTypeFilter = (t: string) => {
    setTypeFilter(prev => {
      const next = new Set(prev)
      if (next.has(t)) { next.delete(t) } else { next.add(t) }
      return next
    })
  }

  const droneCount = mediaItems.filter(f => f.equipTpCd === 'drone').length
  const planeCount = mediaItems.filter(f => f.equipTpCd === 'plane').length
  const satCount = mediaItems.filter(f => f.equipTpCd === 'satellite').length

  return (
    <div className="flex flex-col h-full">
      {/* Filters */}
      <div className="flex items-center justify-between mb-4">
        <div className="flex gap-1.5 items-center">
          <span className="text-[11px] text-text-3 font-korean">촬영 장비:</span>
          <FilterBtn label="전체" active={equipFilter === 'all'} onClick={() => setEquipFilter('all')} />
          <FilterBtn label="🛸 드론" active={equipFilter === 'drone'} onClick={() => setEquipFilter('drone')} />
          <FilterBtn label="✈ 유인항공기" active={equipFilter === 'plane'} onClick={() => setEquipFilter('plane')} />
          <FilterBtn label="🛰 위성" active={equipFilter === 'satellite'} onClick={() => setEquipFilter('satellite')} />
          <span className="w-px h-4 bg-border mx-1" />
          <span className="text-[11px] text-text-3 font-korean">유형:</span>
          <FilterBtn label="📷 사진" active={typeFilter.has('photo')} onClick={() => toggleTypeFilter('photo')} />
          <FilterBtn label="🎬 영상" active={typeFilter.has('video')} onClick={() => toggleTypeFilter('video')} />
        </div>
        <div className="flex gap-2 items-center">
          <input
            type="text"
            placeholder="파일명 검색..."
            value={searchTerm}
            onChange={e => setSearchTerm(e.target.value)}
            className="px-3 py-1.5 bg-bg-0 border border-border rounded-sm text-text-1 font-korean text-[11px] outline-none w-40 focus:border-primary-cyan"
          />
          <select
            value={sortBy}
            onChange={e => setSortBy(e.target.value)}
            className="prd-i py-1.5 w-auto"
          >
            <option value="latest">최신순</option>
            <option value="name">이름순</option>
            <option value="size">크기순</option>
          </select>
        </div>
      </div>

      {/* Summary Stats */}
      <div className="flex gap-2.5 mb-4">
        {[
          { icon: '📸', value: loading ? '…' : String(mediaItems.length), label: '총 파일', color: 'text-primary-cyan' },
          { icon: '🛸', value: loading ? '…' : String(droneCount), label: '드론', color: 'text-text-1' },
          { icon: '✈', value: loading ? '…' : String(planeCount), label: '유인항공기', color: 'text-text-1' },
          { icon: '🛰', value: loading ? '…' : String(satCount), label: '위성', color: 'text-text-1' },
          { icon: '💾', value: '—', label: '총 용량', color: 'text-text-1' },
        ].map((s, i) => (
          <div key={i} className="flex-1 flex items-center gap-2.5 px-4 py-3 bg-bg-3 border border-border rounded-sm">
            <span className="text-xl">{s.icon}</span>
            <div>
              <div className={`text-base font-bold font-mono ${s.color}`}>{s.value}</div>
              <div className="text-[10px] text-text-3 font-korean">{s.label}</div>
            </div>
          </div>
        ))}
      </div>

      {/* File Table */}
      <div className="flex-1 bg-bg-3 border border-border rounded-md overflow-hidden flex flex-col">
        <div className="overflow-auto flex-1">
          <table className="w-full text-left" style={{ tableLayout: 'fixed' }}>
            <colgroup>
              <col style={{ width: 36 }} />
              <col style={{ width: 36 }} />
              <col style={{ width: 120 }} />
              <col style={{ width: 130 }} />
              <col />
              <col style={{ width: 95 }} />
              <col style={{ width: 85 }} />
              <col style={{ width: 145 }} />
              <col style={{ width: 85 }} />
              <col style={{ width: 95 }} />
              <col style={{ width: 50 }} />
            </colgroup>
            <thead>
              <tr className="border-b border-border bg-bg-2">
                <th className="px-2 py-2.5 text-center">
                  <input
                    type="checkbox"
                    checked={selectedIds.size === sorted.length && sorted.length > 0}
                    onChange={toggleAll}
                    className="accent-primary-blue"
                  />
                </th>
                <th className="px-1 py-2.5" />
                <th className="px-2 py-2.5 text-[10px] font-semibold text-text-3 font-korean whitespace-nowrap">사고명</th>
                <th className="px-2 py-2.5 text-[10px] font-semibold text-text-3 font-korean whitespace-nowrap">위치</th>
                <th className="px-2 py-2.5 text-[10px] font-semibold text-text-3 font-korean">파일명</th>
                <th className="px-2 py-2.5 text-[10px] font-semibold text-text-3 font-korean">장비</th>
                <th className="px-2 py-2.5 text-[10px] font-semibold text-text-3 font-korean">유형</th>
                <th className="px-2 py-2.5 text-[10px] font-semibold text-text-3 font-korean whitespace-nowrap">촬영일시</th>
                <th className="px-2 py-2.5 text-[10px] font-semibold text-text-3 font-korean whitespace-nowrap">용량</th>
                <th className="px-2 py-2.5 text-[10px] font-semibold text-text-3 font-korean whitespace-nowrap">해상도</th>
                <th className="px-2 py-2.5 text-[10px] font-semibold text-text-3 text-center">📥</th>
              </tr>
            </thead>
            <tbody>
              {loading ? (
                <tr>
                  <td colSpan={11} className="px-4 py-8 text-center text-[11px] text-text-3 font-korean">불러오는 중...</td>
                </tr>
              ) : sorted.map(f => (
                <tr
                  key={f.aerialMediaSn}
                  onClick={() => toggleId(f.aerialMediaSn)}
                  className={`border-b border-border/50 cursor-pointer transition-colors hover:bg-[rgba(255,255,255,0.02)] ${
                    selectedIds.has(f.aerialMediaSn) ? 'bg-[rgba(6,182,212,0.06)]' : ''
                  }`}
                >
                  <td className="px-2 py-2 text-center" onClick={e => e.stopPropagation()}>
                    <input
                      type="checkbox"
                      checked={selectedIds.has(f.aerialMediaSn)}
                      onChange={() => toggleId(f.aerialMediaSn)}
                      className="accent-primary-blue"
                    />
                  </td>
                  <td className="px-1 py-2 text-base">{equipIcon(f.equipTpCd)}</td>
                  <td className="px-2 py-2 text-[10px] font-semibold text-text-1 font-korean truncate">{f.acdntSn != null ? String(f.acdntSn) : '—'}</td>
                  <td className="px-2 py-2 text-[10px] text-primary-cyan font-mono truncate">{f.locDc ?? '—'}</td>
                  <td className="px-2 py-2 text-[11px] font-semibold text-text-1 font-korean truncate">{f.fileNm}</td>
                  <td className="px-2 py-2">
                    <span className={`px-1.5 py-0.5 rounded text-[9px] font-semibold font-korean ${equipTagCls(f.equipTpCd)}`}>
                      {f.equipNm}
                    </span>
                  </td>
                  <td className="px-2 py-2">
                    <span className={`px-1.5 py-0.5 rounded text-[9px] font-semibold font-korean ${mediaTagCls(f.mediaTpCd)}`}>
                      {f.mediaTpCd === '영상' ? '🎬' : '📷'} {f.mediaTpCd}
                    </span>
                  </td>
                  <td className="px-2 py-2 text-[11px] font-mono">{formatDtm(f.takngDtm)}</td>
                  <td className="px-2 py-2 text-[11px] font-mono">{f.fileSz ?? '—'}</td>
                  <td className="px-2 py-2 text-[11px] font-mono">{f.resolution ?? '—'}</td>
                  <td className="px-2 py-2 text-center" onClick={e => e.stopPropagation()}>
                    <button className="px-2 py-1 text-[10px] rounded bg-[rgba(6,182,212,0.1)] text-primary-cyan border border-primary-cyan/20 hover:bg-[rgba(6,182,212,0.2)] transition-colors">
                      📥
                    </button>
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      </div>

      {/* Bottom Actions */}
      <div className="flex justify-between items-center mt-4 pt-3.5 border-t border-border">
        <div className="text-[11px] text-text-3 font-korean">
          선택된 파일: <span className="text-primary-cyan font-semibold">{selectedIds.size}</span>건
        </div>
        <div className="flex gap-2">
          <button onClick={toggleAll} className="px-3 py-1.5 text-[11px] font-semibold rounded bg-bg-3 border border-border text-text-2 hover:bg-bg-hover transition-colors font-korean">
            ☑ 전체선택
          </button>
          <button className="px-3 py-1.5 text-[11px] font-semibold rounded bg-[rgba(6,182,212,0.1)] text-primary-cyan border border-primary-cyan/30 hover:bg-[rgba(6,182,212,0.2)] transition-colors font-korean">
            📥 선택 다운로드
          </button>
          <button className="px-3 py-1.5 text-[11px] font-semibold rounded bg-[rgba(168,85,247,0.1)] text-primary-purple border border-primary-purple/30 hover:bg-[rgba(168,85,247,0.2)] transition-colors font-korean">
            🧩 유출유면적분석으로 →
          </button>
        </div>
      </div>

      {/* Upload Modal */}
      {showUpload && (
        <div className="fixed inset-0 z-[200] bg-black/60 backdrop-blur-sm flex items-center justify-center">
          <div ref={modalRef} className="bg-bg-1 border border-border rounded-md w-[480px] max-h-[80vh] overflow-y-auto p-6">
            <div className="flex justify-between items-center mb-4">
              <span className="text-base font-bold font-korean">📤 영상·사진 업로드</span>
              <button onClick={() => setShowUpload(false)} className="text-text-3 text-lg hover:text-text-1">✕</button>
            </div>
            <div className="border-2 border-dashed border-border-light rounded-md py-8 px-4 text-center mb-4 cursor-pointer hover:border-primary-cyan/40 transition-colors">
              <div className="text-3xl mb-2 opacity-50">📁</div>
              <div className="text-[13px] font-semibold mb-1 font-korean">파일을 드래그하거나 클릭하여 업로드</div>
              <div className="text-[11px] text-text-3 font-korean">JPG, TIFF, GeoTIFF, MP4, MOV 지원 · 최대 2GB</div>
            </div>
            <div className="mb-3">
              <label className="block text-xs font-semibold mb-1.5 text-text-2 font-korean">촬영 장비</label>
              <select className="prd-i w-full">
                <option>드론 (DJI M300 RTK)</option>
                <option>드론 (DJI Mavic 3E)</option>
                <option>유인항공기 (CN-235)</option>
                <option>유인항공기 (헬기 B-512)</option>
                <option>위성 (Sentinel-1)</option>
                <option>위성 (다목적위성5호)</option>
                <option>기타</option>
              </select>
            </div>
            <div className="mb-3">
              <label className="block text-xs font-semibold mb-1.5 text-text-2 font-korean">연관 사고</label>
              <select className="prd-i w-full">
                <option>여수항 유류유출 (2026-01-18)</option>
                <option>통영 해역 기름오염 (2026-01-18)</option>
                <option>군산항 인근 오염 (2026-01-18)</option>
              </select>
            </div>
            <div className="mb-4">
              <label className="block text-xs font-semibold mb-1.5 text-text-2 font-korean">메모</label>
              <textarea
                className="prd-i w-full h-[60px] resize-y"
                placeholder="촬영 조건, 비고 등..."
              />
            </div>
            <button className="w-full py-3 rounded-sm text-sm font-bold font-korean text-white border-none cursor-pointer" style={{ background: 'linear-gradient(135deg, var(--cyan), var(--blue))' }}>
              📤 업로드 실행
            </button>
          </div>
        </div>
      )}
    </div>
  )
}