import {
  Alert,
  Platform,
  Pressable,
  ScrollView,
  Text,
  View,
} from 'react-native';
import { useRef, useState } from 'react';
import { useSafeAreaInsets } from 'react-native-safe-area-context';
import { useRouter } from 'expo-router';
import { Ionicons } from '@expo/vector-icons';
import { MenuView, type MenuAction } from '@react-native-menu/menu';
import { TrueSheet } from '@lodev09/react-native-true-sheet';
import { useTranslation } from 'react-i18next';
import { LanguageIcon } from '../components/icons/LanguageIcon';
import { useColors } from '../lib/theme';
import { useAuthStore } from '../stores/auth';
import { useThemeStore, type ThemeMode } from '../stores/theme';
import { useLanguageStore, type AppLanguage } from '../stores/language';
import { useUserPlan } from '../hooks/useUserPlan';
import { AppHeader } from '../components/AppHeader';

// ─── Settings Screen ───────────────────────────────────────────────────────

type PickerOption<T extends string> = { value: T; label: string };

type SectionRow = {
  /** Ionicons-name ODER eigenes SVG-Component (für custom icons wie LanguageIcon) */
  icon: React.ComponentProps<typeof Ionicons>['name'] | React.ComponentType<{ size?: number; color?: string }>;
  label: string;
  sublabel: string;
  soon?: boolean;
  destructive?: boolean;
  value?: string;
  onPress?: () => void;
  /** Wenn gesetzt, wrappt UIMenu (anchored Pull-Down) statt onPress-trigger */
  menu?: {
    title: string;
    actions: MenuAction[];
    onSelect: (id: string) => void;
  };
};

type Section = {
  key: string;
  title: string;
  rows: SectionRow[];
};

export default function SettingsScreen() {
  const router = useRouter();
  const insets = useSafeAreaInsets();
  const { t } = useTranslation();
  const { signOut } = useAuthStore();
  const { mode: themeMode, setMode: setThemeMode } = useThemeStore();
  const { language, setLanguage } = useLanguageStore();
  const { plan } = useUserPlan();
  const colors = useColors();

  // Lyra Voice: hardcoded ElevenLabs voice IDs (expandable by user later)
  // Backend endpoint PATCH /api/profile/me/demographics does NOT accept lyraVoiceId.
  // A dedicated PATCH /api/profile/me/lyra-voice endpoint is needed from backend-agent.
  // For now: picker is wired to local state only, changes are NOT persisted.
  const [selectedVoice, setSelectedVoice] = useState('EXAVITQu4vr4xnSDxMaL');

  // TrueSheet ref for Lyra-Voice picker (UISheetPresentationController bottom-sheet)
  const voiceSheetRef = useRef<TrueSheet>(null);

  async function handleSignOut() {
    Alert.alert(t('auth.signOut'), '', [
      { text: t('common.cancel'), style: 'cancel' },
      {
        text: t('auth.signOut'),
        style: 'cancel',
        onPress: async () => {
          await signOut();
          router.replace('/');
        },
      },
    ]);
  }

  const themeOptions: PickerOption<ThemeMode>[] = [
    { value: 'system', label: t('settings.theme_system') },
    { value: 'light', label: t('settings.theme_light') },
    { value: 'dark', label: t('settings.theme_dark') },
  ];

  const themeLabel =
    themeMode === 'system'
      ? t('settings.theme_system')
      : themeMode === 'light'
        ? t('settings.theme_light')
        : t('settings.theme_dark');

  const langOptions: PickerOption<AppLanguage>[] = [
    { value: 'de', label: t('settings.language_de') },
    { value: 'en', label: t('settings.language_en') },
  ];

  const voiceOptions: PickerOption<string>[] = [
    { value: 'EXAVITQu4vr4xnSDxMaL', label: t('settings.lyra_voice_sarah') },
    { value: 'ThT5KcBeYPX3keUQqHPh', label: t('settings.lyra_voice_aria') },
    { value: 'XB0fDUnXU5powFXDhCwa', label: t('settings.lyra_voice_charlotte') },
    { value: 'Xb7hH8MSUJpSbSDYk0k2', label: t('settings.lyra_voice_alice') },
    { value: 'pqHfZKP75CvOlQylNhV4', label: t('settings.lyra_voice_bill') },
  ];

  const selectedVoiceName =
    voiceOptions.find((v) => v.value === selectedVoice)?.label ?? t('settings.lyra_voice_sarah');

  const sections: Section[] = [
    // Profile-Section entfernt — Profile-Edits sind in /profile-Page direkt
    {
      key: 'theme',
      title: t('settings.section_theme'),
      rows: [
        {
          icon: 'color-palette-outline',
          label: t('settings.theme'),
          sublabel: t('settings.theme_desc'),
          value: themeLabel,
          menu: {
            title: t('settings.theme'),
            // Bewusst KEINE `image`-Props (SF-Symbols) — sonst rendert UIMenu mit
            // Icon-Slot reserviert und das Menu wird breiter/höher als bei Sprache.
            actions: themeOptions.map((opt) => ({
              id: opt.value,
              title: opt.label,
              state: opt.value === themeMode ? 'on' : 'off',
            })),
            onSelect: (id) => setThemeMode(id as ThemeMode),
          },
        },
        {
          icon: LanguageIcon,
          label: t('settings.language'),
          sublabel: t('settings.language_desc'),
          value: language === 'de' ? t('settings.language_de') : t('settings.language_en'),
          menu: {
            title: t('settings.language'),
            actions: langOptions.map((opt) => ({
              id: opt.value,
              title: opt.label,
              state: opt.value === language ? 'on' : 'off',
            })),
            onSelect: (id) => setLanguage(id as AppLanguage),
          },
        },
      ],
    },
    {
      key: 'notifications',
      title: t('settings.section_notifications'),
      rows: [
        {
          icon: 'notifications-outline',
          label: t('settings.notifications_push'),
          sublabel: t('settings.notifications_push_desc'),
          soon: true,
        },
        {
          icon: 'flame-outline',
          label: t('settings.notifications_streak'),
          sublabel: t('settings.notifications_streak_desc'),
          soon: true,
        },
      ],
    },
    {
      key: 'devices',
      title: t('settings.section_devices'),
      rows: [
        {
          icon: 'phone-portrait-outline',
          label: t('settings.devices'),
          sublabel: t('settings.devices_desc'),
          onPress: () => router.push('/devices'),
        },
        {
          icon: 'star-outline',
          label: t('settings.subscription'),
          sublabel: t('settings.subscription_desc'),
          soon: true,
        },
      ],
    },
    {
      key: 'lyra',
      title: t('settings.section_lyra'),
      rows: [
        {
          icon: 'mic-outline',
          label: t('settings.lyra_voice'),
          sublabel:
            plan === 'legend'
              ? t('settings.lyra_voice_desc')
              : t('settings.lyra_voice_only_legend'),
          value: plan === 'legend' ? selectedVoiceName : undefined,
          // Voice picker is wired but changes are local-only until
          // PATCH /api/profile/me/lyra-voice endpoint is added by backend-agent.
          onPress:
            plan === 'legend' ? () => voiceSheetRef.current?.present() : undefined,
          soon: plan !== 'legend',
        },
      ],
    },
    {
      key: 'account',
      title: t('settings.danger_section'),
      rows: [
        {
          icon: 'log-out-outline',
          label: t('settings.sign_out'),
          sublabel: '',
          onPress: handleSignOut,
        },
        {
          icon: 'trash-outline',
          label: t('settings.delete_account'),
          sublabel: t('settings.delete_desc'),
          destructive: true,
          soon: true,
        },
      ],
    },
  ];

  if (__DEV__) {
    sections.push({
      key: 'debug',
      title: t('settings.section_debug'),
      rows: [
        {
          icon: 'bug-outline',
          label: t('settings.debug_llm'),
          sublabel: t('settings.debug_llm_desc'),
          soon: true,
        },
        {
          icon: 'volume-high-outline',
          label: t('settings.debug_tts'),
          sublabel: t('settings.debug_tts_desc'),
          soon: true,
        },
      ],
    });
  }

  return (
    <View style={{ flex: 1, backgroundColor: colors.bg }}>
      <AppHeader showBack title={t('settings.title')} />

      <ScrollView
        style={{ flex: 1 }}
        contentContainerStyle={{
          paddingHorizontal: 16,
          paddingTop: 16,
          paddingBottom: insets.bottom + 40,
        }}
        showsVerticalScrollIndicator={false}
      >
        {sections.map((section) => (
          <View key={section.key} style={{ marginBottom: 24 }}>
            <Text
              style={{
                fontSize: 11,
                color: colors.textMuted,
                fontFamily: 'Nunito_600SemiBold',
                textTransform: 'uppercase',
                letterSpacing: 1,
                marginBottom: 8,
                marginLeft: 4,
              }}
            >
              {section.title}
            </Text>
            <View
              style={{
                backgroundColor: colors.surface,
                borderRadius: 14,
                overflow: 'hidden',
                shadowColor: '#000',
                shadowOffset: { width: 0, height: 1 },
                shadowOpacity: 0.04,
                shadowRadius: 3,
                elevation: 1,
              }}
            >
              {section.rows.map((row, i) => {
                // Visual content of the row (icon + label + sublabel)
                const iconColor = row.destructive ? colors.error : colors.textMuted;
                const IconComponent = typeof row.icon === 'string' ? null : row.icon;
                const rowLeft = (
                  <>
                    {IconComponent ? (
                      <IconComponent size={18} color={iconColor} />
                    ) : (
                      <Ionicons
                        name={row.icon as React.ComponentProps<typeof Ionicons>['name']}
                        size={18}
                        color={iconColor}
                      />
                    )}
                    <View style={{ flex: 1 }}>
                      <Text
                        numberOfLines={1}
                        style={{
                          fontSize: 15,
                          color: row.destructive ? colors.error : colors.text,
                          fontFamily: 'Nunito_600SemiBold',
                        }}
                      >
                        {row.label}
                      </Text>
                      {row.sublabel ? (
                        <Text
                          numberOfLines={1}
                          style={{
                            fontSize: 12,
                            color: colors.textMuted,
                            fontFamily: 'Nunito_400Regular',
                            marginTop: 2,
                          }}
                        >
                          {row.sublabel}
                        </Text>
                      ) : null}
                    </View>
                  </>
                );

                const containerStyle = {
                  flexDirection: 'row' as const,
                  alignItems: 'center' as const,
                  gap: 12,
                  paddingHorizontal: 14,
                  paddingVertical: 12,
                  minHeight: 56,
                  borderBottomWidth: i < section.rows.length - 1 ? 1 : 0,
                  borderBottomColor: colors.border,
                  opacity: row.soon ? 0.5 : 1,
                };

                // Row mit Menu: Label-Bereich nicht tappable, MenuView nur am End-Anchor
                if (row.menu) {
                  return (
                    <View key={row.label} style={containerStyle}>
                      {rowLeft}
                      <MenuView
                        title={row.menu.title}
                        actions={row.menu.actions}
                        onPressAction={({ nativeEvent: { event } }) =>
                          row.menu!.onSelect(event)
                        }
                        shouldOpenOnLongPress={false}
                      >
                        <Pressable
                          hitSlop={8}
                          style={({ pressed }) => ({ opacity: pressed ? 0.6 : 1 })}
                        >
                          <View
                            style={{
                              flexDirection: 'row',
                              alignItems: 'center',
                              gap: 4,
                              paddingHorizontal: 8,
                              paddingVertical: 6,
                              borderRadius: 8,
                              backgroundColor: colors.surfaceElevated,
                            }}
                          >
                            {row.value ? (
                              <Text
                                style={{
                                  fontSize: 13,
                                  color: colors.textMuted,
                                  fontFamily: 'Nunito_400Regular',
                                }}
                                numberOfLines={1}
                              >
                                {row.value}
                              </Text>
                            ) : null}
                            <Ionicons
                              name="chevron-forward"
                              size={14}
                              color={colors.textMuted}
                            />
                          </View>
                        </Pressable>
                      </MenuView>
                    </View>
                  );
                }

                // Standard-Row: ganze Pressable als Tap-Target
                return (
                  <Pressable
                    key={row.label}
                    onPress={row.soon ? undefined : row.onPress}
                    disabled={row.soon}
                    style={({ pressed }) => ({
                      opacity: row.soon ? 0.5 : pressed ? 0.7 : 1,
                    })}
                  >
                    <View style={containerStyle}>
                      {rowLeft}
                      {row.soon ? (
                        <Text
                          style={{
                            fontSize: 10,
                            color: colors.textMuted,
                            fontFamily: 'Nunito_600SemiBold',
                            textTransform: 'uppercase',
                            letterSpacing: 0.5,
                          }}
                        >
                          {t('settings.soon_badge')}
                        </Text>
                      ) : row.value ? (
                        <Text
                          style={{
                            fontSize: 13,
                            color: colors.textMuted,
                            fontFamily: 'Nunito_400Regular',
                            marginLeft: 4,
                          }}
                          numberOfLines={1}
                        >
                          {row.value}
                        </Text>
                      ) : (
                        <Ionicons
                          name="chevron-forward"
                          size={16}
                          color={colors.border}
                        />
                      )}
                    </View>
                  </Pressable>
                );
              })}
            </View>
          </View>
        ))}

        <Text
          style={{
            textAlign: 'center',
            fontSize: 11,
            color: colors.textMuted,
            fontFamily: 'Nunito_400Regular',
            marginTop: 6,
            opacity: 0.7,
          }}
        >
          {t('settings.skeleton_footer')}
        </Text>
        <Text
          style={{
            textAlign: 'center',
            fontSize: 10,
            color: colors.textMuted,
            fontFamily: 'Nunito_400Regular',
            marginTop: 4,
            opacity: 0.5,
          }}
        >
          {Platform.OS}
        </Text>
      </ScrollView>

      <TrueSheet
        ref={voiceSheetRef}
        detents={['auto', 1]}
        cornerRadius={20}
        grabber
        backgroundColor={colors.surface}
      >
        <View style={{ paddingHorizontal: 20, paddingTop: 8, paddingBottom: 24, backgroundColor: colors.surface }}>
          <Text
            style={{
              fontSize: 22,
              color: colors.text,
              fontFamily: 'Nunito_700Bold',
              marginBottom: 8,
            }}
          >
            {t('settings.lyra_voice')}
          </Text>
          <Text
            style={{
              fontSize: 13,
              color: colors.textMuted,
              fontFamily: 'Nunito_400Regular',
              marginBottom: 20,
              lineHeight: 18,
            }}
          >
            {t('settings.lyra_voice_desc')}
          </Text>
          {voiceOptions.map((opt, idx) => {
            const isSelected = opt.value === selectedVoice;
            return (
              <Pressable
                key={opt.value}
                onPress={() => {
                  setSelectedVoice(opt.value);
                  voiceSheetRef.current?.dismiss();
                }}
                style={({ pressed }) => ({ opacity: pressed ? 0.6 : 1 })}
              >
                <View
                  style={{
                    flexDirection: 'row',
                    alignItems: 'center',
                    justifyContent: 'space-between',
                    paddingVertical: 16,
                    borderBottomWidth: idx < voiceOptions.length - 1 ? 1 : 0,
                    borderBottomColor: colors.border,
                  }}
                >
                  <Text
                    style={{
                      fontSize: 16,
                      color: colors.text,
                      fontFamily: isSelected ? 'Nunito_700Bold' : 'Nunito_400Regular',
                    }}
                  >
                    {opt.label}
                  </Text>
                  {isSelected ? (
                    <Ionicons name="checkmark" size={20} color={colors.brandOrange} />
                  ) : null}
                </View>
              </Pressable>
            );
          })}
        </View>
      </TrueSheet>
    </View>
  );
}