/**
 * ProfileScreen — zoomer-profil, stats, badges
 */
import { useCallback, useEffect, useState } from 'react'
import {
  View, Text, ScrollView, TouchableOpacity,
  StyleSheet, ActivityIndicator, Alert, RefreshControl,
} from 'react-native'
import { auth, profile, type Zoomer } from '../lib/api'

const LEVEL_LABELS: Record<number, string> = {
  1: 'Rookie Zoomer',
  2: 'Junior Zoomer',
  3: 'Zoomer',
  4: 'Senior Zoomer',
  5: 'Elite Zoomer',
  6: 'Legend Zoomer',
}

const LEVEL_COLOR: Record<number, string> = {
  1: '#6b7280',
  2: '#10b981',
  3: '#3b82f6',
  4: '#8b5cf6',
  5: '#f59e0b',
  6: '#ef4444',
}

function levelProgress(level: number, totalEarned: number): number {
  // Simple XP curve: each level needs level*500 kr more
  const levelThreshold = level * 50000 // in öre = level * 500 SEK
  const prevThreshold = (level - 1) * 50000
  const progress = (totalEarned - prevThreshold) / (levelThreshold - prevThreshold)
  return Math.min(Math.max(progress, 0), 1)
}

export function ProfileScreen() {
  const [zoomer, setZoomer] = useState<Zoomer | null>(null)
  const [loading, setLoading] = useState(true)
  const [refreshing, setRefreshing] = useState(false)

  const load = useCallback(async () => {
    try {
      const data = await profile.get()
      setZoomer(data)
    } catch {
      // silent
    } finally {
      setLoading(false)
      setRefreshing(false)
    }
  }, [])

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

  const onRefresh = useCallback(() => { setRefreshing(true); load() }, [load])

  const handleSignOut = () => {
    Alert.alert(
      'Logga ut',
      'Är du säker på att du vill logga ut?',
      [
        { text: 'Avbryt', style: 'cancel' },
        {
          text: 'Logga ut',
          style: 'destructive',
          onPress: async () => {
            await auth.logout()
            // AppNavigator will detect missing token and show AuthScreen
          },
        },
      ],
    )
  }

  if (loading) {
    return (
      <View style={styles.center}>
        <ActivityIndicator color="#6366f1" size="large" />
      </View>
    )
  }

  const level = zoomer?.level ?? 1
  const levelLabel = LEVEL_LABELS[level] ?? `Nivå ${level}`
  const levelColor = LEVEL_COLOR[level] ?? '#6366f1'
  const progress = zoomer ? levelProgress(level, zoomer.total_earned) : 0
  const initial = (zoomer?.display_name ?? zoomer?.email ?? '?')[0].toUpperCase()

  return (
    <ScrollView
      style={styles.container}
      contentContainerStyle={{ paddingBottom: 40 }}
      refreshControl={<RefreshControl refreshing={refreshing} onRefresh={onRefresh} tintColor="#6366f1" />}
    >
      {/* Avatar + name */}
      <View style={styles.headerSection}>
        <View style={[styles.avatar, { borderColor: levelColor }]}>
          <Text style={styles.avatarText}>{initial}</Text>
        </View>
        <Text style={styles.displayName}>
          {zoomer?.display_name || 'Namnlös zoomer'}
        </Text>
        <Text style={styles.email}>{zoomer?.email}</Text>

        {/* Level badge */}
        <View style={[styles.levelBadge, { backgroundColor: levelColor + '22', borderColor: levelColor + '55' }]}>
          <Text style={[styles.levelBadgeText, { color: levelColor }]}>
            ⭐ {levelLabel}
          </Text>
        </View>

        {/* XP bar */}
        <View style={styles.xpBarWrap}>
          <View style={styles.xpBarBg}>
            <View style={[styles.xpBarFill, { width: `${(progress * 100).toFixed(0)}%` as any, backgroundColor: levelColor }]} />
          </View>
          <Text style={styles.xpLabel}>
            Nivå {level} → {level + 1}  ({(progress * 100).toFixed(0)}%)
          </Text>
        </View>
      </View>

      {/* Stats */}
      <View style={styles.statsGrid}>
        <View style={styles.statCard}>
          <Text style={styles.statValue}>
            {zoomer ? (zoomer.total_earned / 100).toFixed(0) : '0'} kr
          </Text>
          <Text style={styles.statLabel}>Totalt intjänat</Text>
        </View>
        <View style={styles.statCard}>
          <Text style={[styles.statValue, { color: '#10b981' }]}>
            {zoomer?.missions_completed ?? 0}
          </Text>
          <Text style={styles.statLabel}>Uppdrag klara</Text>
        </View>
        <View style={styles.statCard}>
          <Text style={[styles.statValue, { color: levelColor }]}>
            {level}
          </Text>
          <Text style={styles.statLabel}>Nivå</Text>
        </View>
        <View style={styles.statCard}>
          <Text style={[styles.statValue, { color: '#f59e0b' }]}>
            {zoomer?.missions_completed ?? 0}
          </Text>
          <Text style={styles.statLabel}>Uppdrag</Text>
        </View>
      </View>

      {/* Badges — kommer när backend har stöd */}
      <View style={styles.section}>
        <Text style={styles.sectionTitle}>Badges</Text>
        <View style={styles.emptyBadges}>
          <Text style={styles.emptyEmoji}>🏅</Text>
          <Text style={styles.emptyText}>
            Slutför ditt första uppdrag för att låsa upp din första badge!
          </Text>
        </View>
      </View>

      {/* Member since */}
      {zoomer?.joined_at && (
        <Text style={styles.memberSince}>
          Zoomer sedan {new Date(zoomer.joined_at).toLocaleDateString('sv-SE', { month: 'long', year: 'numeric' })}
        </Text>
      )}

      {/* Sign out */}
      <View style={styles.section}>
        <TouchableOpacity style={styles.signOutBtn} onPress={handleSignOut}>
          <Text style={styles.signOutText}>Logga ut</Text>
        </TouchableOpacity>
      </View>
    </ScrollView>
  )
}

const styles = StyleSheet.create({
  container: { flex: 1, backgroundColor: '#0A0A1B' },
  center: { flex: 1, backgroundColor: '#0A0A1B', alignItems: 'center', justifyContent: 'center' },

  headerSection: {
    alignItems: 'center',
    paddingTop: 64,
    paddingHorizontal: 24,
    paddingBottom: 24,
    borderBottomWidth: 1,
    borderBottomColor: 'rgba(255,255,255,0.06)',
  },
  avatar: {
    width: 88, height: 88, borderRadius: 44,
    backgroundColor: 'rgba(99,102,241,0.3)',
    alignItems: 'center', justifyContent: 'center',
    marginBottom: 16,
    borderWidth: 3,
  },
  avatarText: { color: '#fff', fontSize: 36, fontWeight: '800' },
  displayName: { color: '#fff', fontSize: 22, fontWeight: '800', marginBottom: 4 },
  email: { color: 'rgba(255,255,255,0.4)', fontSize: 14, marginBottom: 16 },

  levelBadge: {
    borderRadius: 20, paddingHorizontal: 16, paddingVertical: 8,
    borderWidth: 1, marginBottom: 16,
  },
  levelBadgeText: { fontWeight: '700', fontSize: 13 },

  xpBarWrap: { width: '100%', gap: 6 },
  xpBarBg: {
    height: 6, backgroundColor: 'rgba(255,255,255,0.08)',
    borderRadius: 3, overflow: 'hidden',
  },
  xpBarFill: { height: '100%', borderRadius: 3 },
  xpLabel: { color: 'rgba(255,255,255,0.3)', fontSize: 11, textAlign: 'center' },

  statsGrid: {
    flexDirection: 'row', flexWrap: 'wrap',
    padding: 16, gap: 10,
  },
  statCard: {
    width: '47%',
    backgroundColor: 'rgba(255,255,255,0.04)',
    borderRadius: 16, padding: 16,
    borderWidth: 1, borderColor: 'rgba(255,255,255,0.07)',
    alignItems: 'center',
  },
  statValue: { color: '#fff', fontSize: 24, fontWeight: '800', marginBottom: 4 },
  statLabel: { color: 'rgba(255,255,255,0.35)', fontSize: 12 },

  section: { paddingHorizontal: 16, marginTop: 8 },
  sectionTitle: {
    color: 'rgba(255,255,255,0.35)', fontSize: 12, fontWeight: '700',
    letterSpacing: 1, textTransform: 'uppercase', marginBottom: 12,
  },

  badgesGrid: { flexDirection: 'row', flexWrap: 'wrap', gap: 10 },
  badgeCard: {
    width: '30%',
    backgroundColor: 'rgba(255,255,255,0.04)',
    borderRadius: 14, padding: 12,
    borderWidth: 1, borderColor: 'rgba(255,255,255,0.07)',
    alignItems: 'center', gap: 4,
  },
  badgeEmoji: { fontSize: 28 },
  badgeLabel: { color: '#fff', fontSize: 11, fontWeight: '600', textAlign: 'center' },
  badgeDate: { color: 'rgba(255,255,255,0.3)', fontSize: 9 },

  emptyBadges: {
    backgroundColor: 'rgba(255,255,255,0.03)',
    borderRadius: 16, padding: 24,
    alignItems: 'center', gap: 8,
    borderWidth: 1, borderColor: 'rgba(255,255,255,0.06)',
  },
  emptyEmoji: { fontSize: 36 },
  emptyText: { color: 'rgba(255,255,255,0.4)', fontSize: 13, textAlign: 'center', lineHeight: 20 },

  memberSince: {
    color: 'rgba(255,255,255,0.2)', fontSize: 12, textAlign: 'center',
    marginTop: 16, marginBottom: 8,
  },

  signOutBtn: {
    borderWidth: 1, borderColor: 'rgba(239,68,68,0.35)',
    borderRadius: 14, paddingVertical: 14,
    alignItems: 'center', marginTop: 8,
  },
  signOutText: { color: '#ef4444', fontWeight: '700', fontSize: 15 },
})