'use client';

import * as React from 'react';
import { X, CheckCircle2, AlertCircle, Info } from 'lucide-react';
import { cn } from '@/lib/utils/cn';

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

export interface Toast {
  id: string;
  message: string;
  type: ToastType;
}

interface ToastContextType {
  toasts: Toast[];
  addToast: (message: string, type?: ToastType) => void;
  removeToast: (id: string) => void;
}

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

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

  const addToast = React.useCallback((message: string, type: ToastType = 'success') => {
    const id = Math.random().toString(36).substring(7);
    setToasts((prev) => [...prev, { id, message, type }]);

    // Auto remove after 3 seconds
    setTimeout(() => {
      setToasts((prev) => prev.filter((t) => t.id !== id));
    }, 3000);
  }, []);

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

  return (
    <ToastContext.Provider value={{ toasts, addToast, removeToast }}>
      {children}
      <div className="fixed bottom-4 right-4 z-50 flex flex-col gap-2 pointer-events-none">
        {toasts.map((toast) => (
          <ToastItem key={toast.id} toast={toast} onClose={() => removeToast(toast.id)} />
        ))}
      </div>
    </ToastContext.Provider>
  );
}

function ToastItem({ toast, onClose }: { toast: Toast; onClose: () => void }) {
  const Icon = toast.type === 'success' ? CheckCircle2 : toast.type === 'error' ? AlertCircle : Info;

  return (
    <div
      className={cn(
        'flex items-center gap-3 px-4 py-3 rounded-lg shadow-lg pointer-events-auto',
        'animate-in slide-in-from-right-full duration-300',
        'min-w-[300px] max-w-[400px]',
        {
          'bg-green-50 text-green-900 border border-green-200 dark:bg-green-900/20 dark:text-green-100 dark:border-green-800':
            toast.type === 'success',
          'bg-red-50 text-red-900 border border-red-200 dark:bg-red-900/20 dark:text-red-100 dark:border-red-800':
            toast.type === 'error',
          'bg-blue-50 text-blue-900 border border-blue-200 dark:bg-blue-900/20 dark:text-blue-100 dark:border-blue-800':
            toast.type === 'info',
        }
      )}
    >
      <Icon className="h-5 w-5 flex-shrink-0" />
      <p className="text-sm font-medium flex-1">{toast.message}</p>
      <button
        onClick={onClose}
        className="flex-shrink-0 opacity-70 hover:opacity-100 transition-opacity"
        aria-label="Close"
      >
        <X className="h-4 w-4" />
      </button>
    </div>
  );
}

export function useToast() {
  const context = React.useContext(ToastContext);
  if (!context) {
    throw new Error('useToast must be used within ToastProvider');
  }
  return context;
}