"use client";

import { useState, useEffect } from 'react';
import { motion, AnimatePresence } from 'framer-motion';
import { 
  CheckCircle, 
  XCircle, 
  AlertTriangle, 
  Info, 
  X,
} from 'lucide-react';

export type ToastType = 'success' | 'error' | 'warning' | 'info';

export interface Toast {
  id: string;
  type: ToastType;
  title: string;
  message: string;
  duration?: number;
  action?: {
    label: string;
    onClick: () => void;
  };
}

interface ToastProps {
  toast: Toast;
  onRemove: (id: string) => void;
}

const ToastItem = ({ toast, onRemove }: ToastProps) => {

  useEffect(() => {
    if (toast.duration !== 0) {
      const timer = setTimeout(() => {
        setTimeout(() => onRemove(toast.id), 200);
      }, toast.duration || 3000);

      return () => clearTimeout(timer);
    }
  }, [toast.duration, toast.id, onRemove]);

  const getIcon = () => {
    switch (toast.type) {
      case 'success':
        return <CheckCircle className="w-5 h-5 text-green-400" />;
      case 'error':
        return <XCircle className="w-5 h-5 text-red-400" />;
      case 'warning':
        return <AlertTriangle className="w-5 h-5 text-yellow-400" />;
      case 'info':
        return <Info className="w-5 h-5 text-stone-400" />;
      default:
        return <Info className="w-5 h-5 text-stone-400" />;
    }
  };

  const getColors = () => {
    switch (toast.type) {
      case 'success':
        return 'bg-stone-50 border-green-300 text-green-900 shadow-md';
      case 'error':
        return 'bg-stone-50 border-red-200 text-red-800 shadow-md';
      case 'warning':
        return 'bg-stone-50 border-yellow-200 text-yellow-800 shadow-md';
      case 'info':
        return 'bg-stone-50 border-stone-200 text-stone-800 shadow-md';
      default:
        return 'bg-stone-50 border-stone-200 text-stone-800 shadow-md';
    }
  };

  return (
    <motion.div
      initial={{ opacity: 0, y: -20, scale: 0.95 }}
      animate={{ opacity: 1, y: 0, scale: 1 }}
      exit={{ opacity: 0, y: -10, scale: 0.95 }}
      transition={{ duration: 0.2, ease: "easeOut" }}
      className={`relative p-3 rounded-lg border ${getColors()} shadow-lg hover:shadow-xl transition-all duration-200 max-w-xs text-sm`}
    >
      <div className="flex items-start space-x-2">
        <div className="flex-shrink-0 mt-0.5">
          {getIcon()}
        </div>
        
        <div className="flex-1 min-w-0">
          <h4 className="text-xs font-semibold mb-0.5 leading-tight">{toast.title}</h4>
          <p className="text-xs opacity-90 leading-tight">{toast.message}</p>
          
          {toast.action && (
            <button
              onClick={toast.action.onClick}
              className="mt-1.5 text-xs font-medium underline hover:no-underline transition-all"
            >
              {toast.action.label}
            </button>
          )}
        </div>
        
        <button
          onClick={() => onRemove(toast.id)}
          className="flex-shrink-0 p-0.5 rounded hover:bg-gray-100/50 transition-colors"
        >
          <X className="w-3 h-3 text-gray-500" />
        </button>
      </div>
      
      {/* Progress bar */}
      {toast.duration !== 0 && (
        <motion.div
          initial={{ width: '100%' }}
          animate={{ width: '0%' }}
          transition={{ duration: (toast.duration || 3000) / 1000, ease: "linear" }}
          className="absolute bottom-0 left-0 h-0.5 bg-gradient-to-r from-stone-400 to-stone-600 rounded-b-lg"
        />
      )}
    </motion.div>
  );
};

// Toast context and provider
import { createContext, useContext, useCallback } from 'react';

interface ToastContextType {
  addToast: (toast: Omit<Toast, 'id'>) => void;
  showToast: (toast: Omit<Toast, 'id'>) => void;
  showSuccess: (title: string, message?: string) => void;
  showError: (title: string, message?: string) => void;
  showWarning: (title: string, message?: string) => void;
  showInfo: (title: string, message?: string) => void;
  showEmailSent: (email: string) => void;
  showEmailError: (error: string) => void;
  showProjectSaved: (title: string) => void;
  showProjectDeleted: (title: string) => void;
  showImportSuccess: (count: number) => void;
  showImportError: (error: string) => void;
}

const ToastContext = createContext<ToastContextType | undefined>(undefined);

// No-op fallback for SSR or when outside provider
const noopToast: ToastContextType = {
  addToast: () => {},
  showToast: () => {},
  showSuccess: () => {},
  showError: () => {},
  showWarning: () => {},
  showInfo: () => {},
  showEmailSent: () => {},
  showEmailError: () => {},
  showProjectSaved: () => {},
  showProjectDeleted: () => {},
  showImportSuccess: () => {},
  showImportError: () => {},
};

export const useToast = () => {
  const context = useContext(ToastContext);
  // Return no-op fallback during SSR or if used outside provider
  if (!context) {
    return noopToast;
  }
  return context;
};

export const ToastProvider = ({ children }: { children: React.ReactNode }) => {
  const [toasts, setToasts] = useState<Toast[]>([]);

  const addToast = useCallback((toast: Omit<Toast, 'id'>) => {
    const id = Math.random().toString(36).substr(2, 9);
    const newToast = { ...toast, id };
    setToasts(prev => [...prev, newToast]);
  }, []);

  const removeToast = useCallback((id: string) => {
    setToasts(prev => prev.filter(toast => toast.id !== id));
  }, []);

  const showToast = useCallback((toast: Omit<Toast, 'id'>) => {
    addToast(toast);
  }, [addToast]);

  const showSuccess = useCallback((title: string, message?: string) => {
    addToast({
      type: 'success',
      title,
      message: message || '',
      duration: 4000
    });
  }, [addToast]);

  const showError = useCallback((title: string, message?: string) => {
    addToast({
      type: 'error',
      title,
      message: message || '',
      duration: 4000 // Shorter duration
    });
  }, [addToast]);

  const showWarning = useCallback((title: string, message?: string) => {
    addToast({
      type: 'warning',
      title,
      message: message || '',
      duration: 5000
    });
  }, [addToast]);

  const showInfo = useCallback((title: string, message?: string) => {
    addToast({
      type: 'info',
      title,
      message: message || '',
      duration: 4000
    });
  }, [addToast]);

  const showEmailSent = useCallback((email: string) => {
    addToast({
      type: 'success',
      title: 'E-Mail gesendet! 📧',
      message: `Deine Nachricht an ${email} wurde erfolgreich versendet.`,
      duration: 5000,
    });
  }, [addToast]);

  const showEmailError = useCallback((error: string) => {
    addToast({
      type: 'error',
      title: 'E-Mail Fehler! ❌',
      message: `Fehler beim Senden: ${error}`,
      duration: 8000
    });
  }, [addToast]);

  const showProjectSaved = useCallback((title: string) => {
    addToast({
      type: 'success',
      title: 'Projekt gespeichert! 💾',
      message: `"${title}" wurde erfolgreich in der Datenbank gespeichert.`,
      duration: 4000,
    });
  }, [addToast]);

  const showProjectDeleted = useCallback((title: string) => {
    addToast({
      type: 'warning',
      title: 'Projekt gelöscht! 🗑️',
      message: `"${title}" wurde aus der Datenbank entfernt.`,
      duration: 4000,
    });
  }, [addToast]);

  const showImportSuccess = useCallback((count: number) => {
    addToast({
      type: 'success',
      title: 'Import erfolgreich! 📥',
      message: `${count} Projekte wurden erfolgreich importiert.`,
      duration: 5000,
    });
  }, [addToast]);

  const showImportError = useCallback((error: string) => {
    addToast({
      type: 'error',
      title: 'Import Fehler! ❌',
      message: `Fehler beim Importieren: ${error}`,
      duration: 8000,
    });
  }, [addToast]);

  const contextValue: ToastContextType = {
    addToast,
    showToast,
    showSuccess,
    showError,
    showWarning,
    showInfo,
    showEmailSent,
    showEmailError,
    showProjectSaved,
    showProjectDeleted,
    showImportSuccess,
    showImportError
  };

  return (
    <ToastContext.Provider value={contextValue}>
      {children}
      
      {/* Toast Container */}
      <div className="fixed top-4 right-4 z-50 space-y-3 max-w-sm">
        <AnimatePresence>
          {toasts.map((toast) => (
            <ToastItem
              key={toast.id}
              toast={toast}
              onRemove={removeToast}
            />
          ))}
        </AnimatePresence>
      </div>
    </ToastContext.Provider>
  );
};

export { ToastItem as Toast };
export default ToastItem;