/**
 * MessageActionMenu — WhatsApp-Style Long-Press-Kontextmenü für Chat-Bubbles.
 *
 * Ersetzt den zentriert gerenderten @expo/react-native-action-sheet. Wird an
 * der gedrückten Bubble verankert (per measureInWindow gelieferte `anchor`-Rect):
 *  - Emoji-Reaktions-Leiste OBEN (nur bei fremden Nachrichten)
 *  - Aktions-Liste UNTEN (fremd: Antworten + Kopieren / eigen: Kopieren + Löschen)
 * Blur-Backdrop (iOS) / semi-transparent (Android). Smart-Position: Menü unter
 * der Bubble, oder darüber wenn unten kein Platz ist.
 */
import { useMemo, type ReactNode } from 'react';
import {
  Dimensions,
  Modal,
  Platform,
  Pressable,
  StyleSheet,
  Text,
  TouchableOpacity,
  View,
  useColorScheme,
} from 'react-native';
import { BlurView } from 'expo-blur';
import { Ionicons } from '@expo/vector-icons';
import { useTranslation } from 'react-i18next';
import { useColors } from '../../lib/theme';

const IS_IOS = Platform.OS === 'ios';
const REACTION_EMOJIS = ['👍', '❤️', '😂', '😮', '😢', '🙏', '👏'];

export type AnchorRect = { x: number; y: number; width: number; height: number };

type Props = {
  visible: boolean;
  anchor: AnchorRect | null;
  isOwn: boolean;
  hasContent: boolean;
  /** Aktuelles eigenes Reaktions-Emoji auf dieser Message (für Highlight). */
  myReaction?: string | null;
  /** Scharfe Kopie der gedrückten Bubble — bleibt über dem Blur sichtbar (WA-Stil). */
  preview?: ReactNode;
  onClose: () => void;
  onReact: (emoji: string) => void;
  onReply: () => void;
  onCopy: () => void;
  onDelete: () => void;
};

export function MessageActionMenu({
  visible,
  anchor,
  isOwn,
  hasContent,
  myReaction,
  preview,
  onClose,
  onReact,
  onReply,
  onCopy,
  onDelete,
}: Props) {
  const { t } = useTranslation();
  const colors = useColors();
  const scheme = useColorScheme();

  const actions = useMemo(() => {
    const list: {
      key: string;
      label: string;
      icon: React.ComponentProps<typeof Ionicons>['name'];
      danger?: boolean;
      onPress: () => void;
    }[] = [];
    if (!isOwn) {
      list.push({ key: 'reply', label: t('chat.reply'), icon: 'arrow-undo-outline', onPress: onReply });
    }
    if (hasContent) {
      list.push({ key: 'copy', label: t('chat.copy'), icon: 'copy-outline', onPress: onCopy });
    }
    if (isOwn) {
      list.push({ key: 'delete', label: t('chat.delete'), icon: 'trash-outline', danger: true, onPress: onDelete });
    }
    return list;
  }, [isOwn, hasContent, t, onReply, onCopy, onDelete]);

  if (!anchor) return null;

  const screenW = Dimensions.get('window').width;
  const screenH = Dimensions.get('window').height;
  const topSafe = 60;
  const showReactions = !isOwn;
  const barH = showReactions ? 60 : 0;
  const estMenuH = actions.length * 52 + 12;

  // Input-Bar + Safe-Area am unteren Bildschirmrand (Popup darf nie darunter)
  const bottomInset = 90;
  const usableH = screenH - bottomInset;

  // Menü unter der Bubble wenn genug Platz, sonst darüber — Input-Bar berücksichtigt
  const belowSpace = usableH - (anchor.y + anchor.height);
  const placeBelow = belowSpace >= estMenuH + 8;

  const menuTopIdeal = placeBelow
    ? anchor.y + anchor.height + 8
    : anchor.y - estMenuH - 8;
  // Clampen: nie über Safe-Area oben, nie unter Input-Bar unten
  const menuTop = Math.min(
    Math.max(topSafe + barH + 8, menuTopIdeal),
    usableH - estMenuH,
  );

  // Reaktions-Leiste über der Bubble — nie über topSafe, nie das Menü überlappen
  const barTopIdeal = Math.max(topSafe, anchor.y - barH - 4);
  const barTop = Math.min(barTopIdeal, menuTop - barH - 8);

  // Horizontale Ausrichtung an der Bubble-Seite.
  const sideStyle = isOwn
    ? { right: Math.max(12, screenW - (anchor.x + anchor.width)) }
    : { left: Math.max(12, anchor.x) };

  return (
    <Modal visible={visible} transparent animationType="fade" statusBarTranslucent onRequestClose={onClose}>
      <Pressable style={StyleSheet.absoluteFill} onPress={onClose}>
        {IS_IOS ? (
          <BlurView
            intensity={24}
            tint={scheme === 'dark' ? 'dark' : 'light'}
            style={StyleSheet.absoluteFill}
          />
        ) : (
          <View style={[StyleSheet.absoluteFill, { backgroundColor: 'rgba(0,0,0,0.28)' }]} />
        )}

        {/* Scharfe Kopie der gedrückten Bubble — bleibt über dem Blur sichtbar (WA-Stil) */}
        {preview && (
          <View
            pointerEvents="none"
            style={[
              { position: 'absolute', top: anchor.y, width: anchor.width },
              isOwn
                ? { right: Math.max(12, screenW - (anchor.x + anchor.width)) }
                : { left: Math.max(12, anchor.x) },
            ]}
          >
            {preview}
          </View>
        )}

        {/* Emoji-Reaktions-Leiste (nur fremde Nachrichten) */}
        {showReactions && (
          <View style={[styles.reactionBar, sideStyle, { top: barTop, backgroundColor: colors.surface }]}>
            {REACTION_EMOJIS.map((emoji) => (
              <TouchableOpacity
                key={emoji}
                activeOpacity={0.5}
                onPress={() => {
                  onReact(emoji);
                  onClose();
                }}
                style={styles.reactionBtn}
              >
                <Text style={[styles.reactionEmoji, myReaction === emoji && styles.reactionEmojiActive]}>
                  {emoji}
                </Text>
              </TouchableOpacity>
            ))}
          </View>
        )}

        {/* Aktions-Liste */}
        <View style={[styles.menu, sideStyle, { top: menuTop, backgroundColor: colors.surface }]}>
          {actions.map((a, i) => (
            <TouchableOpacity
              key={a.key}
              activeOpacity={0.6}
              onPress={() => {
                a.onPress();
                onClose();
              }}
              style={[
                styles.menuItem,
                i < actions.length - 1 && { borderBottomWidth: StyleSheet.hairlineWidth, borderBottomColor: colors.border },
              ]}
            >
              <Text
                style={[
                  styles.menuLabel,
                  { color: a.danger ? '#dc2626' : colors.text },
                ]}
              >
                {a.label}
              </Text>
              <Ionicons name={a.icon} size={19} color={a.danger ? '#dc2626' : colors.textMuted} />
            </TouchableOpacity>
          ))}
        </View>
      </Pressable>
    </Modal>
  );
}

const styles = StyleSheet.create({
  reactionBar: {
    position: 'absolute',
    flexDirection: 'row',
    alignItems: 'center',
    borderRadius: 26,
    paddingHorizontal: 6,
    paddingVertical: 5,
    gap: 2,
    shadowColor: '#000',
    shadowOffset: { width: 0, height: 4 },
    shadowOpacity: 0.15,
    shadowRadius: 12,
    elevation: 8,
  },
  reactionBtn: {
    width: 40,
    height: 40,
    borderRadius: 20,
    alignItems: 'center',
    justifyContent: 'center',
  },
  reactionEmoji: { fontSize: 26 },
  reactionEmojiActive: { fontSize: 30 },
  menu: {
    position: 'absolute',
    minWidth: 200,
    borderRadius: 14,
    overflow: 'hidden',
    shadowColor: '#000',
    shadowOffset: { width: 0, height: 6 },
    shadowOpacity: 0.16,
    shadowRadius: 16,
    elevation: 10,
  },
  menuItem: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    paddingHorizontal: 18,
    paddingVertical: 15,
  },
  menuLabel: { fontSize: 15, fontFamily: 'Nunito_600SemiBold' },
});