import React, { createContext, useContext, useState, useCallback, useEffect, ReactNode } from 'react';
import { AlertTriangle, HelpCircle } from 'lucide-react';

interface ConfirmOptions {
  title?: string;
  message: string;
  confirmText?: string;
  cancelText?: string;
  danger?: boolean;
}
type ConfirmInput = string | ConfirmOptions;

interface ConfirmContextType {
  confirm: (input: ConfirmInput) => Promise<boolean>;
}

const ConfirmContext = createContext<ConfirmContextType | undefined>(undefined);

// Detecta ações destrutivas pelo texto → estilo de alerta (vermelho).
const DANGER_RE = /EXCLUIR|REMOVER|APAGAR|PERMANENTE|LIMPAR|CANCELAR|SAIR|DELETE|DESFEIT|RESETAR/i;

export const ConfirmProvider: React.FC<{ children: ReactNode }> = ({ children }) => {
  const [state, setState] = useState<{ opts: ConfirmOptions; resolve: (v: boolean) => void } | null>(null);

  const confirm = useCallback((input: ConfirmInput) => {
    const opts: ConfirmOptions = typeof input === 'string' ? { message: input } : input;
    return new Promise<boolean>((resolve) => setState({ opts, resolve }));
  }, []);

  const close = useCallback((v: boolean) => {
    setState((s) => { s?.resolve(v); return null; });
  }, []);

  useEffect(() => {
    if (!state) return;
    const onKey = (e: KeyboardEvent) => {
      if (e.key === 'Escape') close(false);
      if (e.key === 'Enter') close(true);
    };
    document.addEventListener('keydown', onKey);
    return () => document.removeEventListener('keydown', onKey);
  }, [state, close]);

  const o = state?.opts;
  const danger = o ? (o.danger ?? DANGER_RE.test(`${o.title || ''} ${o.message}`)) : false;

  return (
    <ConfirmContext.Provider value={{ confirm }}>
      {children}
      {o && (
        <div
          className="fixed inset-0 z-[100] flex items-center justify-center bg-black/60 backdrop-blur-sm p-4 animate-in fade-in duration-150"
          onMouseDown={(e) => { if (e.target === e.currentTarget) close(false); }}
        >
          <div className="bg-white rounded-2xl w-full max-w-sm shadow-2xl overflow-hidden animate-in zoom-in-95 slide-in-from-bottom-2 duration-200">
            <div className="p-6 text-center">
              <div className={`w-14 h-14 rounded-2xl flex items-center justify-center mx-auto mb-4 ${danger ? 'bg-red-50' : 'bg-teal-50'}`}>
                {danger ? <AlertTriangle size={26} className="text-red-500" /> : <HelpCircle size={26} className="text-teal-600" />}
              </div>
              {o.title && <h3 className="text-base font-black uppercase tracking-tight text-gray-900 mb-1.5">{o.title}</h3>}
              <p className="text-sm text-gray-600 font-medium leading-relaxed whitespace-pre-line">{o.message}</p>
            </div>
            <div className="px-6 pb-6 flex gap-3">
              <button
                onClick={() => close(false)}
                className="flex-1 py-3 border border-gray-200 rounded-xl text-xs font-black uppercase tracking-widest text-gray-500 hover:bg-gray-50 transition-colors"
              >
                {o.cancelText || 'Cancelar'}
              </button>
              <button
                onClick={() => close(true)}
                autoFocus
                className={`flex-1 py-3 rounded-xl text-xs font-black uppercase tracking-widest text-white transition-opacity hover:opacity-90 ${danger ? 'bg-red-500' : 'bg-teal-600'}`}
              >
                {o.confirmText || 'Confirmar'}
              </button>
            </div>
          </div>
        </div>
      )}
    </ConfirmContext.Provider>
  );
};

export const useConfirm = (): ((input: ConfirmInput) => Promise<boolean>) => {
  const ctx = useContext(ConfirmContext);
  if (!ctx) throw new Error('useConfirm must be used within a ConfirmProvider');
  return ctx.confirm;
};