import { useState, type ReactNode } from "react";
import { View, Text, TouchableOpacity, ActivityIndicator } from "react-native";
import { Ionicons } from "@expo/vector-icons";

// Geteilter Schutz-Setup-Flow (Reihenfolge + Gating). Quelle der Wahrheit für
// Blocker UND Onboarding — NIE die Reihenfolge hier ändern ohne beide zu prüfen.
// Android: VPN → Geräteadmin → a11y (a11y zuletzt, sonst blockt der Tamper-Lock
// die Admin-Seite). iOS: App-Lock → Bildschirmzeit → URL-Filter.
// ─── iOS Unsupervised 3-Step Setup Flow ──────────────────────────────────────

type SetupFlowProps = {
  familyControlsActive: boolean;
  screentimeCode: string | null;
  screentimeConfirmed: boolean;
  screentimeSaving: boolean;
  urlFilterActive: boolean;
  onActivateFamilyControls: () => Promise<{ enabled: boolean; error?: string }>;
  onGenerateScreentimeCode: () => void;
  onConfirmScreentime: () => void;
  onActivateUrlFilter: () => Promise<{ enabled: boolean; error?: string }>;
  colors: ReturnType<typeof import('../../lib/theme').useColors>;
  t: ReturnType<typeof import('react-i18next').useTranslation>['t'];
};

export function IosUnsupervisedSetupFlow({
  familyControlsActive,
  screentimeCode,
  screentimeConfirmed,
  screentimeSaving,
  urlFilterActive,
  onActivateFamilyControls,
  onGenerateScreentimeCode,
  onConfirmScreentime,
  onActivateUrlFilter,
  colors,
  t,
}: SetupFlowProps) {
  const step1Done = familyControlsActive;
  const step2Done = screentimeConfirmed;
  const step3Done = urlFilterActive;

  return (
    <View style={{ gap: 10 }}>
      <SetupStep1
        done={step1Done}
        onActivate={onActivateFamilyControls}
        colors={colors}
        t={t}
      />
      <SetupStep2
        unlocked={step1Done}
        code={screentimeCode}
        confirmed={step2Done}
        saving={screentimeSaving}
        onGenerate={onGenerateScreentimeCode}
        onConfirm={onConfirmScreentime}
        colors={colors}
        t={t}
      />
      <SetupStep3
        unlocked={step2Done}
        done={step3Done}
        onActivate={onActivateUrlFilter}
        colors={colors}
        t={t}
      />
    </View>
  );
}

function SetupStep1({
  done,
  onActivate,
  colors,
  t,
}: {
  done: boolean;
  onActivate: () => Promise<{ enabled: boolean; error?: string }>;
  colors: ReturnType<typeof import('../../lib/theme').useColors>;
  t: ReturnType<typeof import('react-i18next').useTranslation>['t'];
}) {
  const [busy, setBusy] = useState(false);

  async function handlePress() {
    if (done || busy) return;
    setBusy(true);
    try { await onActivate(); } finally { setBusy(false); }
  }

  return (
    <SetupStepCard
      stepNumber={1}
      title={t('blocker.setup_step1_title')}
      subtitle={done ? t('blocker.setup_step1_subtitle_done') : t('blocker.setup_step1_subtitle_pending')}
      done={done}
      unlocked
      colors={colors}
    >
      {!done && (
        <TouchableOpacity
          onPress={handlePress}
          activeOpacity={0.8}
          style={{ backgroundColor: colors.brandOrange, borderRadius: 10, paddingVertical: 10, alignItems: 'center', marginTop: 10 }}
        >
          {busy
            ? <ActivityIndicator size="small" color="#fff" />
            : <Text style={{ fontSize: 14, fontFamily: 'Nunito_700Bold', color: '#fff' }}>{t('blocker.setup_step1_cta')}</Text>
          }
        </TouchableOpacity>
      )}
    </SetupStepCard>
  );
}

function SetupStep2({
  unlocked,
  code,
  confirmed,
  saving,
  onGenerate,
  onConfirm,
  colors,
  t,
}: {
  unlocked: boolean;
  code: string | null;
  confirmed: boolean;
  saving: boolean;
  onGenerate: () => void;
  onConfirm: () => void;
  colors: ReturnType<typeof import('../../lib/theme').useColors>;
  t: ReturnType<typeof import('react-i18next').useTranslation>['t'];
}) {
  return (
    <SetupStepCard
      stepNumber={2}
      title={t('blocker.setup_step2_title')}
      subtitle={confirmed ? t('blocker.setup_step2_subtitle_done') : t('blocker.setup_step2_subtitle_pending')}
      done={confirmed}
      unlocked={unlocked}
      lockedHint={unlocked ? undefined : t('blocker.setup_step_locked_hint', { step: 1 })}
      colors={colors}
    >
      {unlocked && !confirmed && (
        <View style={{ gap: 10, marginTop: 10 }}>
          {!code ? (
            <TouchableOpacity
              onPress={onGenerate}
              activeOpacity={0.8}
              style={{ backgroundColor: colors.brandOrange, borderRadius: 10, paddingVertical: 10, alignItems: 'center' }}
            >
              <Text style={{ fontSize: 14, fontFamily: 'Nunito_700Bold', color: '#fff' }}>
                {t('blocker.screentime_generate_cta')}
              </Text>
            </TouchableOpacity>
          ) : (
            <View style={{ gap: 10 }}>
              <View style={{ backgroundColor: colors.surfaceElevated, borderRadius: 12, padding: 16, alignItems: 'center', gap: 4 }}>
                <Text style={{ fontSize: 11, fontFamily: 'Nunito_600SemiBold', color: colors.textMuted }}>
                  {t('blocker.screentime_code_label')}
                </Text>
                <Text style={{ fontSize: 36, fontFamily: 'Nunito_700Bold', color: colors.brandOrange, letterSpacing: 12 }}>
                  {code}
                </Text>
              </View>
              <View style={{ backgroundColor: colors.surfaceElevated, borderRadius: 12, padding: 12, gap: 6 }}>
                {[
                  t('blocker.screentime_step1'),
                  t('blocker.screentime_step2'),
                  t('blocker.screentime_step3'),
                ].map((step, i) => (
                  <Text
                    key={i}
                    style={{
                      fontSize: 13,
                      fontFamily: i === 0 ? 'Nunito_700Bold' : 'Nunito_600SemiBold',
                      color: i === 0 ? colors.brandOrange : colors.text,
                      lineHeight: 18,
                    }}
                  >
                    {step}
                  </Text>
                ))}
                <Text style={{ fontSize: 11, fontFamily: 'Nunito_400Regular', color: colors.textMuted, lineHeight: 16, marginTop: 2 }}>
                  {t('blocker.screentime_step_note')}
                </Text>
              </View>
              <TouchableOpacity
                onPress={onConfirm}
                disabled={saving}
                activeOpacity={0.8}
                style={{ backgroundColor: colors.brandOrange, borderRadius: 10, paddingVertical: 10, alignItems: 'center' }}
              >
                {saving
                  ? <ActivityIndicator size="small" color="#fff" />
                  : <Text style={{ fontSize: 14, fontFamily: 'Nunito_700Bold', color: '#fff' }}>{t('blocker.screentime_confirm_cta')}</Text>
                }
              </TouchableOpacity>
            </View>
          )}
        </View>
      )}
    </SetupStepCard>
  );
}

function SetupStep3({
  unlocked,
  done,
  onActivate,
  colors,
  t,
}: {
  unlocked: boolean;
  done: boolean;
  onActivate: () => Promise<{ enabled: boolean; error?: string }>;
  colors: ReturnType<typeof import('../../lib/theme').useColors>;
  t: ReturnType<typeof import('react-i18next').useTranslation>['t'];
}) {
  const [busy, setBusy] = useState(false);

  async function handlePress() {
    if (done || busy) return;
    setBusy(true);
    try { await onActivate(); } finally { setBusy(false); }
  }

  return (
    <SetupStepCard
      stepNumber={3}
      title={t('blocker.setup_step3_title')}
      subtitle={done ? t('blocker.setup_step3_subtitle_done') : t('blocker.setup_step3_subtitle_pending')}
      done={done}
      unlocked={unlocked}
      lockedHint={unlocked ? undefined : t('blocker.setup_step_locked_hint', { step: 2 })}
      colors={colors}
    >
      {unlocked && !done && (
        <View style={{ gap: 10, marginTop: 10 }}>
          <View style={{ backgroundColor: colors.surfaceElevated, borderRadius: 10, padding: 10, flexDirection: 'row', gap: 8 }}>
            <Ionicons name="information-circle-outline" size={15} color={colors.textMuted} style={{ marginTop: 1 }} />
            <Text style={{ flex: 1, fontSize: 12, fontFamily: 'Nunito_400Regular', color: colors.textMuted, lineHeight: 17 }}>
              {t('blocker.setup_step3_warning')}
            </Text>
          </View>
          <TouchableOpacity
            onPress={handlePress}
            activeOpacity={0.8}
            style={{ backgroundColor: colors.success, borderRadius: 10, paddingVertical: 10, alignItems: 'center' }}
          >
            {busy
              ? <ActivityIndicator size="small" color="#fff" />
              : <Text style={{ fontSize: 14, fontFamily: 'Nunito_700Bold', color: '#fff' }}>{t('blocker.setup_step3_cta')}</Text>
            }
          </TouchableOpacity>
        </View>
      )}
    </SetupStepCard>
  );
}

// ─── Android 3-Step Setup Flow ───────────────────────────────────────────────

type AndroidSetupFlowProps = {
  vpnActive: boolean;
  // = a11y-Service enabled UND Tamper-Lock armed (appDeletionLock). Nur "enabled"
  // reicht NICHT — der a11y-Service ist ohne armed-Flag komplett passiv.
  accessibilityLocked: boolean;
  deviceAdminActive: boolean;
  onActivateVpn: () => Promise<{ enabled: boolean; error?: string }>;
  onActivateAccessibility: () => Promise<unknown>;
  onRequestDeviceAdmin: () => Promise<{ launched: boolean }>;
  colors: ReturnType<typeof import('../../lib/theme').useColors>;
  t: ReturnType<typeof import('react-i18next').useTranslation>['t'];
};

export function AndroidSetupFlow({
  vpnActive,
  accessibilityLocked,
  deviceAdminActive,
  onActivateVpn,
  onActivateAccessibility,
  onRequestDeviceAdmin,
  colors,
  t,
}: AndroidSetupFlowProps) {
  // Reihenfolge KRITISCH: VPN → Geräteadmin → a11y. a11y MUSS zuletzt, weil der
  // Tamper-Lock (sobald armed) die Geräteadmin-Seite blockt — sonst kann der
  // User den Admin gar nicht mehr aktivieren.
  const vpnDone = vpnActive;
  const adminDone = deviceAdminActive;
  const a11yDone = accessibilityLocked;

  return (
    <View style={{ gap: 10 }}>
      <AndroidStep1
        done={vpnDone}
        onActivate={onActivateVpn}
        colors={colors}
        t={t}
      />
      {/* Display-Step 2 = Geräteadmin (Komponente AndroidStep3, i18n android_step3_*). */}
      <AndroidStep3
        unlocked={vpnDone}
        done={adminDone}
        onRequestAdmin={onRequestDeviceAdmin}
        colors={colors}
        t={t}
      />
      {/* Display-Step 3 = a11y / ReBreak-Schutz (Komponente AndroidStep2, i18n android_step2_*). */}
      <AndroidStep2
        unlocked={adminDone}
        done={a11yDone}
        onActivate={onActivateAccessibility}
        colors={colors}
        t={t}
      />
    </View>
  );
}

function AndroidStep1({
  done,
  onActivate,
  colors,
  t,
}: {
  done: boolean;
  onActivate: () => Promise<{ enabled: boolean; error?: string }>;
  colors: ReturnType<typeof import('../../lib/theme').useColors>;
  t: ReturnType<typeof import('react-i18next').useTranslation>['t'];
}) {
  const [busy, setBusy] = useState(false);

  async function handlePress() {
    if (done || busy) return;
    setBusy(true);
    try { await onActivate(); } finally { setBusy(false); }
  }

  return (
    <SetupStepCard
      stepNumber={1}
      title={t('blocker.android_step1_title')}
      subtitle={done ? t('blocker.android_step1_subtitle_done') : t('blocker.android_step1_subtitle_pending')}
      done={done}
      unlocked
      colors={colors}
    >
      {!done && (
        <TouchableOpacity
          onPress={handlePress}
          activeOpacity={0.8}
          style={{ backgroundColor: colors.brandOrange, borderRadius: 10, paddingVertical: 10, alignItems: 'center', marginTop: 10 }}
        >
          {busy
            ? <ActivityIndicator size="small" color="#fff" />
            : <Text style={{ fontSize: 14, fontFamily: 'Nunito_700Bold', color: '#fff' }}>{t('blocker.android_step1_cta')}</Text>
          }
        </TouchableOpacity>
      )}
    </SetupStepCard>
  );
}

function AndroidStep2({
  unlocked,
  done,
  onActivate,
  colors,
  t,
}: {
  unlocked: boolean;
  done: boolean;
  onActivate: () => Promise<unknown>;
  colors: ReturnType<typeof import('../../lib/theme').useColors>;
  t: ReturnType<typeof import('react-i18next').useTranslation>['t'];
}) {
  const [busy, setBusy] = useState(false);

  async function handlePress() {
    if (busy) return;
    setBusy(true);
    try { await onActivate(); } finally { setBusy(false); }
  }

  return (
    <SetupStepCard
      stepNumber={3}
      title={t('blocker.android_step2_title')}
      subtitle={done ? t('blocker.android_step2_subtitle_done') : t('blocker.android_step2_subtitle_pending')}
      done={done}
      unlocked={unlocked}
      lockedHint={unlocked ? undefined : t('blocker.setup_step_locked_hint', { step: 2 })}
      colors={colors}
    >
      {unlocked && !done && (
        <View style={{ gap: 8, marginTop: 10 }}>
          <View style={{ backgroundColor: colors.surfaceElevated, borderRadius: 12, padding: 12, gap: 6 }}>
            {[
              t('blocker.android_step2_instruction1'),
              t('blocker.android_step2_instruction2'),
              t('blocker.android_step2_instruction3'),
            ].map((line, i) => (
              <Text
                key={i}
                style={{
                  fontSize: 13,
                  fontFamily: i === 0 ? 'Nunito_700Bold' : 'Nunito_600SemiBold',
                  color: i === 0 ? colors.brandOrange : colors.text,
                  lineHeight: 18,
                }}
              >
                {line}
              </Text>
            ))}
          </View>
          <TouchableOpacity
            onPress={handlePress}
            activeOpacity={0.8}
            style={{ backgroundColor: colors.brandOrange, borderRadius: 10, paddingVertical: 10, alignItems: 'center', marginTop: 2 }}
          >
            {busy
              ? <ActivityIndicator size="small" color="#fff" />
              : <Text style={{ fontSize: 14, fontFamily: 'Nunito_700Bold', color: '#fff' }}>{t('blocker.android_step2_cta')}</Text>
            }
          </TouchableOpacity>
          <Text style={{ fontSize: 11, fontFamily: 'Nunito_400Regular', color: colors.textMuted, lineHeight: 16 }}>
            {t('blocker.android_step2_note')}
          </Text>
        </View>
      )}
    </SetupStepCard>
  );
}

function AndroidStep3({
  unlocked,
  done,
  onRequestAdmin,
  colors,
  t,
}: {
  unlocked: boolean;
  done: boolean;
  onRequestAdmin: () => Promise<{ launched: boolean }>;
  colors: ReturnType<typeof import('../../lib/theme').useColors>;
  t: ReturnType<typeof import('react-i18next').useTranslation>['t'];
}) {
  const [busy, setBusy] = useState(false);

  async function handlePress() {
    if (done || busy) return;
    setBusy(true);
    try { await onRequestAdmin(); } finally { setBusy(false); }
  }

  return (
    <SetupStepCard
      stepNumber={2}
      title={t('blocker.android_step3_title')}
      subtitle={done ? t('blocker.android_step3_subtitle_done') : t('blocker.android_step3_subtitle_pending')}
      done={done}
      unlocked={unlocked}
      lockedHint={unlocked ? undefined : t('blocker.setup_step_locked_hint', { step: 1 })}
      colors={colors}
    >
      {unlocked && !done && (
        <View style={{ gap: 10, marginTop: 10 }}>
          <View style={{ backgroundColor: colors.surfaceElevated, borderRadius: 10, padding: 10, flexDirection: 'row', gap: 8 }}>
            <Ionicons name="information-circle-outline" size={15} color={colors.textMuted} style={{ marginTop: 1 }} />
            <Text style={{ flex: 1, fontSize: 12, fontFamily: 'Nunito_400Regular', color: colors.textMuted, lineHeight: 17 }}>
              {t('blocker.android_step3_warning')}
            </Text>
          </View>
          <TouchableOpacity
            onPress={handlePress}
            activeOpacity={0.8}
            style={{ backgroundColor: colors.success, borderRadius: 10, paddingVertical: 10, alignItems: 'center' }}
          >
            {busy
              ? <ActivityIndicator size="small" color="#fff" />
              : <Text style={{ fontSize: 14, fontFamily: 'Nunito_700Bold', color: '#fff' }}>{t('blocker.android_step3_cta')}</Text>
            }
          </TouchableOpacity>
        </View>
      )}
    </SetupStepCard>
  );
}

function SetupStepCard({
  stepNumber,
  title,
  subtitle,
  done,
  unlocked,
  lockedHint,
  colors,
  children,
}: {
  stepNumber: number;
  title: string;
  subtitle: string;
  done: boolean;
  unlocked: boolean;
  lockedHint?: string;
  colors: ReturnType<typeof import('../../lib/theme').useColors>;
  children?: ReactNode;
}) {
  const borderColor = done ? '#86efac' : unlocked ? colors.border : colors.border;
  const cardBg = done ? '#f0fdf4' : colors.surface;
  const numberBg = done ? '#dcfce7' : unlocked ? colors.surfaceElevated : colors.surfaceElevated;
  const numberColor = done ? colors.success : unlocked ? colors.text : colors.textMuted;
  const titleColor = done ? colors.success : unlocked ? colors.text : colors.textMuted;

  return (
    <View style={{ backgroundColor: cardBg, borderWidth: 1, borderColor, borderRadius: 16, padding: 14 }}>
      <View style={{ flexDirection: 'row', alignItems: 'center', gap: 12 }}>
        <View style={{ width: 36, height: 36, borderRadius: 18, backgroundColor: numberBg, alignItems: 'center', justifyContent: 'center' }}>
          {done
            ? <Ionicons name="checkmark" size={18} color={colors.success} />
            : <Text style={{ fontSize: 14, fontFamily: 'Nunito_700Bold', color: numberColor }}>{stepNumber}</Text>
          }
        </View>
        <View style={{ flex: 1 }}>
          <Text style={{ fontSize: 14, fontFamily: 'Nunito_700Bold', color: titleColor }}>{title}</Text>
          {!!subtitle && (
            <Text style={{ fontSize: 12, fontFamily: 'Nunito_400Regular', color: colors.textMuted, marginTop: 2, lineHeight: 17 }}>{subtitle}</Text>
          )}
        </View>
        {done && <Ionicons name="checkmark-circle" size={24} color={colors.success} />}
      </View>
      {lockedHint && !done && (
        <View style={{ marginTop: 8, flexDirection: 'row', gap: 6, alignItems: 'center' }}>
          <Ionicons name="lock-closed-outline" size={13} color={colors.textMuted} />
          <Text style={{ fontSize: 11, fontFamily: 'Nunito_400Regular', color: colors.textMuted }}>{lockedHint}</Text>
        </View>
      )}
      {children}
    </View>
  );
}