// apps/mobile/app/(tabs)/settings.tsx
// 설정 탭 — 계정, 백엔드, 환경설정
// Phase M-2에서 디자인(docs/v3/designs/settings.html) 정밀 적용

import { View, ScrollView, StyleSheet, Alert, Switch } from 'react-native'
import { useSafeAreaInsets } from 'react-native-safe-area-context'
import { MetalCard, PhosphorText, PhysicalButton, Led, d3roNativePalette } from '@d3ro/ui-native'
import { useAuth } from '../../lib/auth-context'
import { supabase } from '../../lib/supabase'

export default function SettingsScreen(): React.ReactElement {
  const insets = useSafeAreaInsets()
  const { user } = useAuth()

  async function handleLogout(): Promise<void> {
    Alert.alert('Logout', 'Are you sure you want to log out?', [
      { text: 'Cancel', style: 'cancel' },
      {
        text: 'Logout',
        style: 'destructive',
        onPress: async () => {
          await supabase.auth.signOut()
        }
      }
    ])
  }

  const initials = user?.email
    ? user.email.substring(0, 2).toUpperCase()
    : 'US'

  return (
    <ScrollView style={styles.container} contentContainerStyle={styles.content}>
      {/* Header */}
      <PhosphorText variant="title" color="primary" style={[styles.title, { paddingTop: insets.top + 8 }]}>
        Settings
      </PhosphorText>

      {/* Account Section */}
      <PhosphorText variant="label" color="muted" style={styles.sectionLabel}>
        ACCOUNT & PLAN
      </PhosphorText>
      <MetalCard style={styles.section}>
        <View style={styles.profileRow}>
          <View style={styles.avatar}>
            <PhosphorText variant="body" color="amber">{initials}</PhosphorText>
          </View>
          <View style={styles.profileInfo}>
            <PhosphorText variant="body" color="primary">
              {user?.email?.split('@')[0] ?? 'User'}
            </PhosphorText>
            <PhosphorText variant="label" color="muted">
              {user?.email ?? '—'}
            </PhosphorText>
          </View>
        </View>
        <View style={[styles.row, { backgroundColor: d3roNativePalette.bg.inset }]}>
          <PhosphorText variant="small" color="muted">TIER</PhosphorText>
          <View style={styles.rowRight}>
            <Led color="amber" size={6} />
            <PhosphorText variant="body" color="amber" style={{ marginLeft: 8 }}>
              FREE
            </PhosphorText>
          </View>
        </View>
      </MetalCard>

      {/* Backend Section */}
      <PhosphorText variant="label" color="muted" style={styles.sectionLabel}>
        BACKEND CONFIG
      </PhosphorText>
      <MetalCard style={styles.section}>
        <View style={styles.row}>
          <View>
            <PhosphorText variant="body" color="primary">LLM Model</PhosphorText>
            <PhosphorText variant="label" color="muted">AI processing backend</PhosphorText>
          </View>
          <PhosphorText variant="body" color="amber">CLAUDE</PhosphorText>
        </View>
        <View style={[styles.row, styles.rowBorder]}>
          <View>
            <PhosphorText variant="body" color="primary">Cloud STT</PhosphorText>
            <PhosphorText variant="label" color="muted">Google Cloud Speech</PhosphorText>
          </View>
          <Switch
            value={true}
            trackColor={{
              false: d3roNativePalette.bg.inset,
              true: d3roNativePalette.accent.amber
            }}
            thumbColor="#ffffff"
          />
        </View>
      </MetalCard>

      {/* Preferences Section */}
      <PhosphorText variant="label" color="muted" style={styles.sectionLabel}>
        PREFERENCES
      </PhosphorText>
      <MetalCard style={styles.section}>
        <View style={styles.row}>
          <PhosphorText variant="body" color="primary">Language</PhosphorText>
          <PhosphorText variant="body" color="muted">Korean</PhosphorText>
        </View>
        <View style={[styles.row, styles.rowBorder]}>
          <PhosphorText variant="body" color="primary">Auto Polish</PhosphorText>
          <Switch
            value={true}
            trackColor={{
              false: d3roNativePalette.bg.inset,
              true: d3roNativePalette.accent.amber
            }}
            thumbColor="#ffffff"
          />
        </View>
        <View style={[styles.row, styles.rowBorder]}>
          <PhosphorText variant="body" color="primary">Haptic Feedback</PhosphorText>
          <Switch
            value={true}
            trackColor={{
              false: d3roNativePalette.bg.inset,
              true: d3roNativePalette.accent.amber
            }}
            thumbColor="#ffffff"
          />
        </View>
      </MetalCard>

      {/* Logout */}
      <View style={styles.logoutWrap}>
        <PhysicalButton label="LOGOUT" variant="secondary" onPress={() => void handleLogout()} />
      </View>

      {/* Status Footer */}
      <View style={styles.footer}>
        <Led color="green" size={6} />
        <PhosphorText variant="label" color="muted" style={{ marginLeft: 6, letterSpacing: 1 }}>
          CLOUD CONNECTED
        </PhosphorText>
      </View>
    </ScrollView>
  )
}

const styles = StyleSheet.create({
  container: { flex: 1, backgroundColor: d3roNativePalette.bg.app },
  content: { paddingBottom: 120 },
  title: {
    paddingHorizontal: 20,
    paddingBottom: 12,
    borderBottomWidth: 1,
    borderBottomColor: 'rgba(46, 46, 50, 0.5)',
    fontFamily: undefined
  },
  sectionLabel: {
    paddingHorizontal: 24,
    paddingTop: 20,
    paddingBottom: 8,
    letterSpacing: 3
  },
  section: {
    marginHorizontal: 20,
    padding: 0,
    overflow: 'hidden'
  },
  profileRow: {
    flexDirection: 'row',
    alignItems: 'center',
    padding: 16,
    gap: 12,
    borderBottomWidth: 1,
    borderBottomColor: 'rgba(46, 46, 50, 0.5)'
  },
  avatar: {
    width: 40,
    height: 40,
    borderRadius: 20,
    backgroundColor: d3roNativePalette.bg.inset,
    borderWidth: 1,
    borderColor: d3roNativePalette.border.default,
    justifyContent: 'center',
    alignItems: 'center'
  },
  profileInfo: { gap: 2 },
  row: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    padding: 16
  },
  rowBorder: {
    borderTopWidth: 1,
    borderTopColor: 'rgba(46, 46, 50, 0.5)'
  },
  rowRight: { flexDirection: 'row', alignItems: 'center' },
  logoutWrap: { margin: 20 },
  footer: {
    flexDirection: 'row',
    justifyContent: 'center',
    alignItems: 'center',
    opacity: 0.5,
    marginTop: 16
  }
})