// 4-7-8 Atemübung: Card (in-chat) + Drawer (bottom sheet).
import { useEffect, useRef, useState } from 'react';
import { View, Text, TouchableOpacity, Animated, StyleSheet } from 'react-native';
import { BREATH_PHASES, TOTAL_ROUNDS, type BreathState } from '../../lib/sosConstants';
import { useColors } from '../../lib/theme';

type Props = { onDone: () => void; onSpeak?: (text: string) => Promise<void> | void };

export function BreathingCard({ onDone, onSpeak }: Props) {
  const colors = useColors();
  const [breathState, setBreathState] = useState<BreathState>('idle');
  const [countdown, setCountdown] = useState(3);
  const [round, setRound] = useState(1);
  const [phaseIndex, setPhaseIndex] = useState(0);
  const [count, setCount] = useState(BREATH_PHASES[0]!.duration);
  const pulse = useRef(new Animated.Value(1)).current;
  const timerRef = useRef<ReturnType<typeof setInterval> | null>(null);
  const animRef = useRef<Animated.CompositeAnimation | null>(null);
  const currentPhase = BREATH_PHASES[phaseIndex]!;

  function runPulse(target: number, seconds: number) {
    animRef.current?.stop();
    animRef.current = Animated.timing(pulse, { toValue: target, duration: seconds * 1000, useNativeDriver: true });
    animRef.current.start();
  }

  // Countdown: visually 3 → 2 → 1 → 0 ("Los!"), then transition to active
  useEffect(() => {
    if (breathState !== 'countdown') return;
    if (countdown > 0) {
      const t = setTimeout(() => setCountdown((c) => c - 1), 1000);
      return () => clearTimeout(t);
    } else {
      // Kein "Los!" sprechen — würde laufende Lyra-Antwort abbrechen
      const t = setTimeout(() => setBreathState('active'), 500);
      return () => clearTimeout(t);
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [breathState, countdown]);

  // Breathing phases with TTS guidance
  useEffect(() => {
    if (breathState !== 'active') return;
    let remaining = currentPhase.duration;
    setCount(remaining);
    runPulse(currentPhase.phase === 'exhale' ? 1 : 1.22, currentPhase.duration);

    // Speak only if speakLine defined — short words avoid overlap (inhale=4s, exhale=8s)
    let speakTimer: ReturnType<typeof setTimeout> | null = null;
    if (currentPhase.speakLine) {
      speakTimer = setTimeout(() => onSpeak?.(currentPhase.speakLine!), 350);
    }

    timerRef.current = setInterval(() => {
      remaining -= 1;
      setCount(remaining);
      if (remaining <= 0) {
        clearInterval(timerRef.current!);
        const next = phaseIndex + 1;
        if (next >= BREATH_PHASES.length) {
          if (round >= TOTAL_ROUNDS) {
            // Lob ZUERST komplett ausspielen, DANN onDone (das triggert Lyras nächste Frage)
            (async () => {
              try { await onSpeak?.('Sehr gut! Du hast alle drei Runden geschafft. Wunderbar gemacht!'); } catch {}
              onDone();
            })();
            return;
          }
          // Nächste Runde still starten
          setRound((r) => r + 1);
          setPhaseIndex(0);
        } else {
          setPhaseIndex(next);
        }
      }
    }, 1000);
    return () => {
      if (timerRef.current) clearInterval(timerRef.current);
      if (speakTimer) clearTimeout(speakTimer);
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [breathState, phaseIndex, round]);

  return (
    <View style={st.breathCardInner}>
      {breathState === 'idle' ? (
        <View style={{ alignItems: 'center', gap: 16 }}>
          <Text style={st.breathTitle}>4-7-8 Atemübung</Text>
          <Text style={st.breathSub}>3 Runden · beruhigt dein Nervensystem</Text>
          <TouchableOpacity activeOpacity={0.7} style={[st.breathStartBtn, { backgroundColor: colors.brandOrange }]} onPress={() => { setCountdown(3); setBreathState('countdown'); }}>
            <Text style={st.breathStartTxt}>Starten</Text>
          </TouchableOpacity>
        </View>
      ) : breathState === 'countdown' ? (
        <View style={{ alignItems: 'center', gap: 20 }}>
          <Text style={st.breathSub}>Gleich geht's los...</Text>
          <View style={[st.breathCircleLg, { borderColor: '#6366f1', backgroundColor: '#6366f118' }]}>
            <Text style={st.breathCountLg}>{countdown > 0 ? countdown : '✓'}</Text>
          </View>
        </View>
      ) : (
        <View style={{ alignItems: 'center', gap: 20 }}>
          <Text style={st.breathRound}>Runde {round} / {TOTAL_ROUNDS}</Text>
          <Animated.View style={{ transform: [{ scale: pulse }] }}>
            <View style={[st.breathCircleLg, { borderColor: currentPhase.color, backgroundColor: currentPhase.color + '22' }]}>
              <Text style={st.breathCountLg}>{count}</Text>
              <Text style={[st.breathPhaseLabel, { color: currentPhase.color, fontSize: 18, marginTop: 4 }]}>{currentPhase.label}</Text>
            </View>
          </Animated.View>
        </View>
      )}
    </View>
  );
}

// ── BreathingDrawer (bottom sheet, covers input, slides up) ───────────────────
export function BreathingDrawer({ onDone, onSpeak }: Props) {
  const colors = useColors();
  const slideAnim = useRef(new Animated.Value(500)).current;
  useEffect(() => {
    Animated.spring(slideAnim, { toValue: 0, useNativeDriver: true, damping: 22, mass: 1, stiffness: 200 }).start();
  }, []);
  return (
    <>
      <View style={st.breathBackdrop} pointerEvents="none" />
      <Animated.View style={[st.breathDrawerContainer, { transform: [{ translateY: slideAnim }], backgroundColor: colors.bg }]}>
        <View style={st.breathDrawerHandle} />
        <BreathingCard onDone={onDone} onSpeak={onSpeak} />
      </Animated.View>
    </>
  );
}

const st = StyleSheet.create({
  breathBackdrop: { position: 'absolute', top: 0, left: 0, right: 0, bottom: 0, backgroundColor: 'rgba(0,0,0,0.28)', zIndex: 20 },
  breathDrawerContainer: { position: 'absolute', bottom: 0, left: 0, right: 0, zIndex: 21, borderTopLeftRadius: 28, borderTopRightRadius: 28, paddingBottom: 36, shadowColor: '#000', shadowOffset: { width: 0, height: -4 }, shadowOpacity: 0.18, shadowRadius: 20, elevation: 24 },
  breathDrawerHandle: { width: 40, height: 4, borderRadius: 2, backgroundColor: '#d1d5db', alignSelf: 'center', marginTop: 14, marginBottom: 4 },
  breathCardInner: { paddingHorizontal: 24, paddingTop: 20, paddingBottom: 8, alignItems: 'center', gap: 16 },
  breathCircleLg: { width: 190, height: 190, borderRadius: 95, alignItems: 'center', justifyContent: 'center', borderWidth: 5 },
  breathCountLg: { fontFamily: 'Nunito_800ExtraBold', fontSize: 60, color: '#111827', lineHeight: 68 },
  breathTitle: { fontFamily: 'Nunito_700Bold', fontSize: 15, color: '#111827' },
  breathSub: { fontFamily: 'Nunito_400Regular', fontSize: 13, color: '#6b7280', textAlign: 'center' },
  breathStartBtn: { borderRadius: 12, paddingHorizontal: 28, paddingVertical: 10, marginTop: 4 },
  breathStartTxt: { color: '#fff', fontFamily: 'Nunito_700Bold', fontSize: 14 },
  breathRound: { fontFamily: 'Nunito_600SemiBold', fontSize: 12, color: '#9ca3af' },
  breathPhaseLabel: { fontFamily: 'Nunito_700Bold', fontSize: 13 },
});