'use client';

import { createContext, useContext, useEffect, useState, ReactNode } from 'react';
import { useUserPreferences } from './UserPreferencesContext';
import { PRESET_BACKGROUNDS, BACKGROUND_NAMES, TOAST_ICONS, getNextBackground } from '@/lib/ui-config';
import { useSession } from 'next-auth/react';
import { useToast } from '@/components/ui/Toast';

interface BackgroundContextType {
  backgroundImage: string | undefined;
  setBackgroundImage: (image: string | undefined) => void;
  cycleBackground: () => void;
}

const BackgroundContext = createContext<BackgroundContextType | undefined>(undefined);

interface BackgroundProviderProps {
  children: ReactNode;
}

export function BackgroundProvider({ children }: BackgroundProviderProps) {
  const { preferences, updateViewPreferences } = useUserPreferences();
  const { data: session } = useSession();
  const { showToast } = useToast();
  const [backgroundImage, setBackgroundImageState] = useState<string | undefined>(
    preferences?.viewPreferences?.backgroundImage
  );
  const [backgroundBlur, setBackgroundBlurState] = useState<number>(
    preferences?.viewPreferences?.backgroundBlur || 0
  );
  const [backgroundOpacity, setBackgroundOpacityState] = useState<number>(
    preferences?.viewPreferences?.backgroundOpacity || 100
  );
  const [mounted, setMounted] = useState(false);

  // Hydration safe initialization
  useEffect(() => {
    setMounted(true);
  }, []);

  // Sync with preferences (only for authenticated users)
  useEffect(() => {
    // Only sync if user is authenticated
    if (session?.user?.id && preferences?.viewPreferences?.backgroundImage !== backgroundImage) {
      setBackgroundImageState(preferences?.viewPreferences?.backgroundImage);
    }
    if (preferences?.viewPreferences?.backgroundBlur !== backgroundBlur) {
      setBackgroundBlurState(preferences?.viewPreferences?.backgroundBlur || 0);
    }
    if (preferences?.viewPreferences?.backgroundOpacity !== backgroundOpacity) {
      setBackgroundOpacityState(preferences?.viewPreferences?.backgroundOpacity || 100);
    }
  }, [preferences?.viewPreferences?.backgroundImage, preferences?.viewPreferences?.backgroundBlur, preferences?.viewPreferences?.backgroundOpacity, backgroundImage, backgroundBlur, backgroundOpacity, session?.user?.id]);

  // Apply background image to document body
  useEffect(() => {
    if (mounted) {
      const body = document.body;
      
      // Supprimer l'ancien élément de fond s'il existe
      const existingBackground = document.getElementById('custom-background');
      if (existingBackground) {
        existingBackground.remove();
      }
      
      if (backgroundImage) {
        console.log('Creating background element for:', backgroundImage);
        // Créer un élément div pour l'image de fond avec les effets
        const backgroundElement = document.createElement('div');
        backgroundElement.id = 'custom-background';
        backgroundElement.style.position = 'fixed';
        backgroundElement.style.top = '0';
        backgroundElement.style.left = '0';
        backgroundElement.style.width = '100%';
        backgroundElement.style.height = '100%';
        backgroundElement.style.zIndex = '-1';
        backgroundElement.style.pointerEvents = 'none';
        
        // Vérifier si c'est une URL d'image ou un preset
        const presetIds = PRESET_BACKGROUNDS.map(preset => preset.id);
        
        if (backgroundImage && presetIds.includes(backgroundImage as typeof presetIds[number])) {
          // Trouver le preset correspondant
          const preset = PRESET_BACKGROUNDS.find(p => p.id === backgroundImage);
          if (preset) {
            // Appliquer le gradient directement
            backgroundElement.style.background = preset.preview;
            // Ajouter une classe pour identifier le type de background
            backgroundElement.className = `preset-background preset-${preset.id}`;
          }
        } else {
          // Appliquer l'URL d'image personnalisée
          backgroundElement.style.backgroundImage = `url(${backgroundImage})`;
          backgroundElement.className = 'custom-background';
        }
        
        // Appliquer les propriétés communes
        backgroundElement.style.backgroundSize = 'cover';
        backgroundElement.style.backgroundPosition = 'center';
        backgroundElement.style.backgroundRepeat = 'no-repeat';
        backgroundElement.style.filter = `blur(${backgroundBlur}px)`;
        backgroundElement.style.opacity = `${backgroundOpacity / 100}`;
        
        // Ajouter l'élément au body
        body.appendChild(backgroundElement);
        body.classList.add('has-background-image');
      } else {
        // Supprimer l'image de fond
        body.classList.remove('has-background-image');
      }
    }
  }, [backgroundImage, backgroundBlur, backgroundOpacity, mounted]);

  const setBackgroundImage = (image: string | undefined) => {
    setBackgroundImageState(image);
  };

  const cycleBackground = () => {
    const currentBackground = backgroundImage; // Utiliser le state local au lieu des préférences
    const customImages = preferences?.viewPreferences?.customImages || [];
    
    const nextBackground = getNextBackground(currentBackground || 'none', customImages);
    const newBackgroundImage = nextBackground === 'none' ? undefined : nextBackground;
    
    setBackgroundImageState(newBackgroundImage);
    
    // Sauvegarder seulement si l'utilisateur est authentifié
    if (session?.user?.id) {
      updateViewPreferences({ backgroundImage: newBackgroundImage });
    }
    
    // Afficher le toast avec le nom du background
    const backgroundName = BACKGROUND_NAMES[nextBackground] || 'Image personnalisée';
    showToast(`Background: ${backgroundName}`, 2000, TOAST_ICONS.background);
  };

  return (
    <BackgroundContext.Provider value={{ backgroundImage, setBackgroundImage, cycleBackground }}>
      {children}
    </BackgroundContext.Provider>
  );
}

export function useBackground() {
  const context = useContext(BackgroundContext);
  if (context === undefined) {
    throw new Error('useBackground must be used within a BackgroundProvider');
  }
  return context;
}
