import { useCallback, useState } from 'react'
import { View, Text, FlatList, TouchableOpacity, StyleSheet, RefreshControl } from 'react-native'
import { useFocusEffect, router } from 'expo-router'
import { useTheme } from '../../constants/ThemeContext'
import { type ThemeTokens } from '../../constants/ItmsTheme'
import { EmptyState } from '../../components/ui'
import { rowTitle, rowDate, rowAuthor } from '../../constants/rows'
import { itmsBoardList, listRows, itmsErrorMessage, type RowMap } from '../itmsApi'

/*
 * 공지/게시판 목록(BBSAdminManageController /bbs/admin/selectBoardList.do).
 * 서버 미기동/무권한 시 빈 상태.
 */
export default function Notices() {
  const { t } = useTheme()
  const s = makeStyles(t)
  const [rows, setRows] = useState<RowMap[]>([])
  const [loading, setLoading] = useState(false)
  const [err, setErr] = useState('')

  const load = useCallback(async () => {
    setLoading(true); setErr('')
    try { setRows(listRows(await itmsBoardList())) }
    catch (e) { setErr(itmsErrorMessage(e)); setRows([]) }
    finally { setLoading(false) }
  }, [])

  useFocusEffect(useCallback(() => { load() }, [load]))

  return (
    <View style={s.wrap}>
      <View style={s.head}><Text style={s.title}>공지사항</Text></View>
      <FlatList
        data={rows}
        keyExtractor={(_, i) => String(i)}
        contentContainerStyle={rows.length === 0 ? { flexGrow: 1 } : { padding: 16 }}
        refreshControl={<RefreshControl refreshing={loading} onRefresh={load} tintColor={t.accent} />}
        ListEmptyComponent={loading ? null : <EmptyState icon="bell" text={err || '표시할 공지가 없습니다.'} />}
        renderItem={({ item }) => (
          <TouchableOpacity
            style={s.card}
            onPress={() => router.push({ pathname: '/notice-detail', params: { raw: JSON.stringify(item) } })}
          >
            <Text style={s.cardTitle} numberOfLines={2}>{rowTitle(item)}</Text>
            <Text style={s.cardSub}>{[rowAuthor(item), rowDate(item)].filter(Boolean).join(' · ')}</Text>
          </TouchableOpacity>
        )}
      />
    </View>
  )
}

const makeStyles = (t: ThemeTokens) => StyleSheet.create({
  wrap: { flex: 1, backgroundColor: t.bg },
  head: { paddingHorizontal: 16, paddingTop: 16, paddingBottom: 8 },
  title: { color: t.text, fontSize: 22, fontWeight: '900' },
  card: { backgroundColor: t.card, borderRadius: 12, borderWidth: 1, borderColor: t.border, padding: 14, marginBottom: 10 },
  cardTitle: { color: t.text, fontSize: 15, fontWeight: '700' },
  cardSub: { color: t.muted, fontSize: 12, marginTop: 4 },
})