import React, { useState, useCallback } from 'react'
import { View, Text, ScrollView, StyleSheet, RefreshControl } from 'react-native'
import { useFocusEffect } from 'expo-router'
import { COLORS } from '../../constants/Config'
import client from '../../services/api'

export default function SecurityScoreScreen() {
  const [data, setData] = useState<any>(null)
  const [loading, setLoading] = useState(false)

  const load = useCallback(async () => {
    setLoading(true)
    try { const r = await client.get('/api/ai-soc/security-score'); setData(r.data) }
    catch { setData(null) } finally { setLoading(false) }
  }, [])

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

  if (!data) return <Text style={s.empty}>보안 점수를 불러올 수 없습니다.</Text>

  const score = data.total_score ?? data.score ?? 0
  const color = score >= 80 ? COLORS.success : score >= 60 ? COLORS.warning : COLORS.danger

  const domains = data.domains ?? [
    { name: 'Zero Trust 정책', score: data.zt_score ?? 0 },
    { name: '취약점 관리', score: data.vuln_score ?? 0 },
    { name: '감사 로그 완전성', score: data.audit_score ?? 0 },
    { name: '패치 적용률', score: data.patch_score ?? 0 },
    { name: 'CSAP 준수', score: data.csap_score ?? 0 },
  ]

  return (
    <ScrollView style={s.container} refreshControl={<RefreshControl refreshing={loading} onRefresh={load} />} contentContainerStyle={{ padding: 16 }}>
      <View style={[s.hero, { borderColor: color }]}>
        <Text style={s.heroLabel}>보안 점수</Text>
        <Text style={[s.heroScore, { color }]}>{score}</Text>
        <Text style={[s.heroGrade, { color }]}>{score >= 80 ? 'A등급' : score >= 60 ? 'B등급' : 'C등급'}</Text>
      </View>

      {domains.map((d: any) => {
        const c = d.score >= 80 ? COLORS.success : d.score >= 60 ? COLORS.warning : COLORS.danger
        return (
          <View key={d.name} style={s.row}>
            <Text style={s.dname}>{d.name}</Text>
            <View style={s.bar}><View style={[s.fill, { width: `${d.score}%`, backgroundColor: c }]} /></View>
            <Text style={[s.dscore, { color: c }]}>{d.score}</Text>
          </View>
        )
      })}

      {data.findings?.length > 0 && (
        <View style={s.findingsCard}>
          <Text style={s.findingsTitle}>주요 발견 사항</Text>
          {data.findings.map((f: string, i: number) => <Text key={i} style={s.finding}>• {f}</Text>)}
        </View>
      )}
    </ScrollView>
  )
}

const s = StyleSheet.create({
  container:    { flex: 1, backgroundColor: COLORS.bg },
  empty:        { textAlign: 'center', color: COLORS.muted, marginTop: 40 },
  hero:         { alignItems: 'center', borderWidth: 2, borderRadius: 16, padding: 24, marginBottom: 16, backgroundColor: '#fff', elevation: 2 },
  heroLabel:    { fontSize: 13, color: COLORS.muted },
  heroScore:    { fontSize: 64, fontWeight: '900', lineHeight: 72 },
  heroGrade:    { fontSize: 16, fontWeight: '700', marginTop: 4 },
  row:          { flexDirection: 'row', alignItems: 'center', gap: 10, backgroundColor: '#fff', borderRadius: 10, padding: 12, marginBottom: 6, elevation: 1 },
  dname:        { fontSize: 12, color: COLORS.text, width: 100 },
  bar:          { flex: 1, height: 6, backgroundColor: COLORS.border, borderRadius: 3, overflow: 'hidden' },
  fill:         { height: '100%', borderRadius: 3 },
  dscore:       { fontSize: 13, fontWeight: '700', width: 28 },
  findingsCard: { backgroundColor: '#fff', borderRadius: 12, padding: 14, marginTop: 8, elevation: 1 },
  findingsTitle:{ fontSize: 14, fontWeight: '700', color: COLORS.danger, marginBottom: 8 },
  finding:      { fontSize: 12, color: COLORS.text, marginBottom: 4 },
})