import React, { useState, useEffect } from 'react';
import { View, Pressable, StyleSheet, Platform } from 'react-native';
import Text from '~/components/atoms/Text';
import { useTheme } from '~/features/theme/ThemeProvider';
import BaseModal from '~/components/atoms/BaseModal';
import BaseLanguageSelector, { LanguageItem } from '~/components/molecules/BaseLanguageSelector';
import { useTranslation } from 'react-i18next';
import Icon from '~/components/atoms/Icon';

const tailwindConfig = require('../../tailwind.config.js');

interface Language {
  nativeName: string;
  emoji: string;
  locale?: string;
}

interface MultiLanguageSelectorProps {
  isVisible?: boolean;
  onClose?: () => void;
  languages: Record<string, Language>;
  selectedLanguages?: string[];
  onToggleLanguage: (language: string) => void;
  title?: string;

  // Eigenschaften für den Button-Modus
  buttonMode?: boolean;
  size?: number;
  onButtonPress?: () => void;
}

const MultiLanguageSelector: React.FC<MultiLanguageSelectorProps> = ({
  isVisible = false,
  onClose = () => {},
  languages,
  selectedLanguages = [],
  onToggleLanguage,
  title,
  buttonMode = false,
  size = 40,
  onButtonPress,
}) => {
  const { isDark, themeVariant } = useTheme();
  const { t } = useTranslation();
  const [modalVisible, setModalVisible] = useState(isVisible);
  
  // Aktualisiere modalVisible, wenn sich isVisible ändert
  useEffect(() => {
    setModalVisible(isVisible);
  }, [isVisible]);
  
  // Get theme colors
  const getThemeColors = () => {
    try {
      if (tailwindConfig?.theme?.extend?.colors) {
        const colors = tailwindConfig.theme.extend.colors;
        
        if (isDark && colors.dark?.[themeVariant]) {
          return {
            text: colors.dark[themeVariant].text || '#FFFFFF',
            primary: colors.dark[themeVariant].primary || '#f8d62b',
            primaryButton: colors.dark[themeVariant].primaryButton || '#f8d62b',
            contentBackground: colors.dark[themeVariant].contentBackground || '#1E1E1E',
            contentBackgroundHover: colors.dark[themeVariant].contentBackgroundHover || '#333333',
            menuBackground: colors.dark[themeVariant].menuBackground || '#252525',
            border: colors.dark[themeVariant].borderLight || '#333333',
          };
        } else if (colors[themeVariant]) {
          return {
            text: colors[themeVariant].text || '#000000',
            primary: colors[themeVariant].primary || '#f8d62b',
            primaryButton: colors[themeVariant].primaryButton || '#f8d62b',
            contentBackground: colors[themeVariant].contentBackground || '#ffffff',
            contentBackgroundHover: colors[themeVariant].contentBackgroundHover || '#f5f5f5',
            menuBackground: colors[themeVariant].menuBackground || '#dddddd',
            border: colors[themeVariant].borderLight || '#f2f2f2',
          };
        }
      }
      
      // Fallback colors
      return {
        text: isDark ? '#FFFFFF' : '#000000',
        primary: '#f8d62b',
        primaryButton: '#f8d62b',
        contentBackground: isDark ? '#1E1E1E' : '#ffffff',
        contentBackgroundHover: isDark ? '#333333' : '#f5f5f5',
        menuBackground: isDark ? '#252525' : '#dddddd',
        border: isDark ? '#333333' : '#f2f2f2',
      };
    } catch (e) {
      console.debug('Error loading theme colors:', e);
      return {
        text: isDark ? '#FFFFFF' : '#000000',
        primary: '#f8d62b',
        primaryButton: '#f8d62b',
        contentBackground: isDark ? '#1E1E1E' : '#ffffff',
        contentBackgroundHover: isDark ? '#333333' : '#f5f5f5',
        menuBackground: isDark ? '#252525' : '#dddddd',
        border: isDark ? '#333333' : '#f2f2f2',
      };
    }
  };

  const themeColors = getThemeColors();
  
  // Convert languages to BaseLanguageSelector format
  const languageItems: Record<string, LanguageItem> = Object.entries(languages).reduce(
    (acc, [code, lang]) => {
      acc[code] = {
        code,
        ...lang,
      };
      return acc;
    },
    {} as Record<string, LanguageItem>
  );

  // Handler for selection changes
  const handleSelectionChange = (newSelection: string[]) => {
    // Ensure selectedLanguages is always an array - defensive check for undefined/null
    const safeSelectedLanguages = Array.isArray(selectedLanguages) ? selectedLanguages : [];
    // Find the difference to determine which language was toggled
    const added = newSelection.find(lang => !safeSelectedLanguages.includes(lang));
    const removed = safeSelectedLanguages.find(lang => !newSelection.includes(lang));

    if (added) {
      onToggleLanguage(added);
    } else if (removed) {
      onToggleLanguage(removed);
    }
  };
  
  const handleOpenModal = () => {
    setModalVisible(true);
    if (onButtonPress) onButtonPress();
  };
  
  const handleCloseModal = () => {
    setModalVisible(false);
    if (onClose) onClose();
  };
  
  // Bestimme den Titel des Modals
  const getModalTitle = () => {
    return title || t('language.select_recording_language', 'Aufnahmesprache auswählen');
  };
  
  // Bestimme, welches Icon/Emoji für den Button angezeigt werden soll
  const renderSelectorContent = () => {
    // Ensure selectedLanguages is always an array - defensive check for undefined/null
    const safeSelectedLanguages = Array.isArray(selectedLanguages) ? selectedLanguages : [];
    const hasSelection = safeSelectedLanguages.length > 0;

    if (safeSelectedLanguages.length === 0) {
      // Kein Sprachfilter ausgewählt
      return (
        <View style={{ opacity: 0.6 }}>
          <Icon name="language-outline" size={size * 0.6} color={themeColors.text} />
        </View>
      );
    } else if (safeSelectedLanguages.includes('auto')) {
      // Auto-Modus ausgewählt
      return (
        <View style={{
          justifyContent: 'center',
          alignItems: 'center',
          width: '100%',
          height: '100%',
        }}>
          <Text style={{
            fontSize: size * 0.65,
            lineHeight: size * 0.75,
            textAlign: 'center',
            includeFontPadding: false,
            marginTop: 2,
          }}>🌐</Text>
        </View>
      );
    } else if (safeSelectedLanguages.length === 1) {
      // Eine Sprache ausgewählt
      const language = safeSelectedLanguages[0];
      const languageData = languages[language];
      const emoji = languageData?.emoji || '🌐';
      return (
        <View style={{
          justifyContent: 'center',
          alignItems: 'center',
          width: '100%',
          height: '100%',
        }}>
          <Text style={{
            fontSize: size * 0.65,
            lineHeight: size * 0.75,
            textAlign: 'center',
            includeFontPadding: false,
            marginTop: 2,
          }}>{emoji}</Text>
        </View>
      );
    } else {
      // Mehrere Sprachen ausgewählt - zeige alle Flaggen vertikal
      // Größere Flaggen bei 2-3 Sprachen
      const flagSize = safeSelectedLanguages.length <= 3 ? size * 0.5 : size * 0.35;

      return (
        <View style={{
          justifyContent: 'center',
          alignItems: 'center',
          flexDirection: 'column',
        }}>
          {safeSelectedLanguages.map((lang, index) => {
            const languageData = languages[lang];
            const emoji = languageData?.emoji || '🌐';
            return (
              <Text 
                key={lang} 
                style={{ 
                  fontSize: flagSize,
                  lineHeight: flagSize,
                  marginTop: index === 0 ? 0 : 4, // Mehr Abstand zwischen Flaggen
                  includeFontPadding: false,
                }}
              >
                {emoji}
              </Text>
            );
          })}
        </View>
      );
    }
  };
  

  // Im Button-Modus zeigen wir nur den Button an, der das Modal öffnet
  if (buttonMode) {
    const safeSelectedLanguages = Array.isArray(selectedLanguages) ? selectedLanguages : [];
    const hasSelection = safeSelectedLanguages.length > 0;

    const buttonStyles = StyleSheet.create({
      buttonContainer: {
        justifyContent: 'center',
        alignItems: 'center',
        backgroundColor: 'transparent',
      },
      selectorButton: {
        borderRadius: size / 2,
        justifyContent: 'center',
        alignItems: 'center',
        backgroundColor: 'transparent',
        shadowColor: '#000',
        shadowOffset: { width: 0, height: 1 },
        shadowOpacity: 0,
        shadowRadius: 2,
        ...(Platform.OS === 'android' && {
          elevation: 0,
        }),
      },
    });

    // Dynamische Höhe für mehrere Flaggen
    const buttonHeight = safeSelectedLanguages.length > 1 && !safeSelectedLanguages.includes('auto')
      ? Math.min(size + (safeSelectedLanguages.length - 1) * size * 0.25, size * 2)  // Dynamisch basierend auf Anzahl, max 2x size
      : size;
    
    return (
      <View style={[buttonStyles.buttonContainer, { width: size, height: buttonHeight }]}>
        <Pressable
          style={[buttonStyles.selectorButton, { width: size, height: buttonHeight, borderRadius: buttonHeight / 2 }]}
          onPress={handleOpenModal}
          android_ripple={{ 
            color: isDark ? 'rgba(255, 255, 255, 0.1)' : 'rgba(0, 0, 0, 0.1)',
            borderless: true,
            radius: size / 2
          }}
        >
          {renderSelectorContent()}
        </Pressable>
        
        <BaseModal
          isVisible={modalVisible}
          onClose={handleCloseModal}
          title={getModalTitle()}
          animationType="fade"
          closeOnOverlayPress={true}
          showCloseButton={true}
          hideFooter={true}
          scrollable={false}
          noPadding={true}
          size="medium"
        >
          <BaseLanguageSelector
            languages={languageItems}
            selectedLanguages={selectedLanguages}
            onSelect={handleSelectionChange}
            mode="multi"
            showAutoDetect={true}
            height={450}
            priorityLanguages={['de', 'en', 'it', 'fr', 'es']}
          />
        </BaseModal>
      </View>
    );
  }
  
  // Standard-Modus: Nur das Modal anzeigen
  return (
    <BaseModal
      isVisible={modalVisible}
      onClose={handleCloseModal}
      title={getModalTitle()}
      animationType="fade"
      closeOnOverlayPress={true}
      showCloseButton={true}
      hideFooter={true}
      scrollable={false}
      noPadding={true}
      size="medium"
    >
      <BaseLanguageSelector
        languages={languageItems}
        selectedLanguages={selectedLanguages}
        onSelect={handleSelectionChange}
        mode="multi"
        showAutoDetect={true}
        height={450}
        priorityLanguages={['de', 'en', 'it', 'fr', 'es']}
      />
    </BaseModal>
  );
};

export default MultiLanguageSelector;