import React, { useEffect, useRef } from 'react';
import { AlertTriangle } from 'lucide-react';

/**
 * ConfirmModal — themed replacement for window.confirm().
 *
 * Props:
 *   open        {boolean}  Whether the modal is visible
 *   title       {string}   Heading text (e.g. "Delete Document")
 *   message     {string|ReactNode}  Body text / description
 *   confirmText {string}   Label for the confirm button (default "Confirm")
 *   cancelText  {string}   Label for the cancel button  (default "Cancel")
 *   variant     {"danger"|"warning"|"default"}  Controls accent color (default "danger")
 *   onConfirm   {function} Called when user confirms
 *   onCancel    {function} Called when user cancels or presses Escape
 */
export default function ConfirmModal({
  open,
  title = 'Confirm',
  message = 'Are you sure?',
  confirmText = 'Confirm',
  cancelText = 'Cancel',
  variant = 'danger',
  onConfirm,
  onCancel,
}) {
  const confirmRef = useRef(null);

  // Focus the confirm button when the modal opens and handle Escape key
  useEffect(() => {
    if (!open) return;

    // Small delay so the DOM is painted before we focus
    const timer = setTimeout(() => confirmRef.current?.focus(), 50);

    const handleKey = (e) => {
      if (e.key === 'Escape') onCancel?.();
    };
    document.addEventListener('keydown', handleKey);
    return () => {
      clearTimeout(timer);
      document.removeEventListener('keydown', handleKey);
    };
  }, [open, onCancel]);

  if (!open) return null;

  const accentMap = {
    danger:  { color: '#EF4444', bg: 'rgba(239,68,68,0.10)', bgHover: 'rgba(239,68,68,0.18)', border: 'rgba(239,68,68,0.3)' },
    warning: { color: '#F59E0B', bg: 'rgba(245,158,11,0.10)', bgHover: 'rgba(245,158,11,0.18)', border: 'rgba(245,158,11,0.3)' },
    default: { color: '#0EA5E9', bg: 'rgba(14,165,233,0.10)', bgHover: 'rgba(14,165,233,0.18)', border: 'rgba(14,165,233,0.3)' },
  };
  const accent = accentMap[variant] || accentMap.danger;

  return (
    <div
      role="dialog"
      aria-modal="true"
      aria-labelledby="confirm-modal-title"
      style={{
        position: 'fixed', inset: 0, zIndex: 70,
        background: 'rgba(10, 14, 39, 0.95)',
        backdropFilter: 'blur(8px)',
        display: 'flex', alignItems: 'center', justifyContent: 'center',
        padding: '1rem',
        animation: 'confirmFadeIn 0.15s ease-out',
      }}
      onClick={(e) => { if (e.target === e.currentTarget) onCancel?.(); }}
    >
      <div style={{
        background: 'linear-gradient(135deg, rgba(30,41,59,0.98) 0%, rgba(15,23,42,0.99) 100%)',
        border: `1px solid ${accent.border}`,
        borderRadius: '0.75rem',
        boxShadow: `0 20px 60px rgba(0,0,0,0.7), 0 0 30px ${accent.color}10`,
        width: '100%', maxWidth: '420px',
        padding: '1.75rem 2rem',
        animation: 'confirmSlideUp 0.15s ease-out',
      }}>
        {/* Header */}
        <div style={{
          display: 'flex', alignItems: 'center', gap: '0.625rem',
          marginBottom: '1rem',
        }}>
          <div style={{
            width: '32px', height: '32px', borderRadius: '0.5rem',
            background: accent.bg,
            border: `1px solid ${accent.border}`,
            display: 'flex', alignItems: 'center', justifyContent: 'center',
            flexShrink: 0,
          }}>
            <AlertTriangle style={{ width: '16px', height: '16px', color: accent.color }} />
          </div>
          <div
            id="confirm-modal-title"
            style={{
              fontFamily: "'JetBrains Mono', monospace",
              fontSize: '0.95rem', fontWeight: '700',
              color: accent.color,
              textTransform: 'uppercase',
              letterSpacing: '0.08em',
            }}
          >
            {title}
          </div>
        </div>

        {/* Body */}
        <div style={{
          fontSize: '0.82rem', color: '#CBD5E1',
          lineHeight: '1.6', marginBottom: '1.5rem',
          fontFamily: "'Outfit', system-ui, sans-serif",
        }}>
          {message}
        </div>

        {/* Actions */}
        <div style={{ display: 'flex', gap: '0.75rem' }}>
          <button
            onClick={onCancel}
            style={{
              flex: 1, padding: '0.625rem',
              background: 'transparent',
              border: '1px solid rgba(100,116,139,0.4)',
              borderRadius: '0.375rem',
              color: '#94A3B8', cursor: 'pointer',
              fontFamily: "'JetBrains Mono', monospace",
              fontSize: '0.78rem',
              transition: 'all 0.2s ease',
            }}
            onMouseEnter={e => {
              e.currentTarget.style.borderColor = 'rgba(100,116,139,0.8)';
              e.currentTarget.style.color = '#CBD5E1';
            }}
            onMouseLeave={e => {
              e.currentTarget.style.borderColor = 'rgba(100,116,139,0.4)';
              e.currentTarget.style.color = '#94A3B8';
            }}
          >
            {cancelText}
          </button>
          <button
            ref={confirmRef}
            onClick={onConfirm}
            style={{
              flex: 1.5, padding: '0.625rem',
              background: accent.bg,
              border: `1px solid ${accent.color}`,
              borderRadius: '0.375rem',
              color: accent.color, cursor: 'pointer',
              fontFamily: "'JetBrains Mono', monospace",
              fontSize: '0.78rem', fontWeight: '600',
              textTransform: 'uppercase', letterSpacing: '0.05em',
              transition: 'all 0.2s ease',
              display: 'flex', alignItems: 'center', justifyContent: 'center', gap: '0.4rem',
            }}
            onMouseEnter={e => {
              e.currentTarget.style.background = accent.bgHover;
              e.currentTarget.style.boxShadow = `0 0 20px ${accent.color}25`;
            }}
            onMouseLeave={e => {
              e.currentTarget.style.background = accent.bg;
              e.currentTarget.style.boxShadow = 'none';
            }}
          >
            {confirmText}
          </button>
        </div>
      </div>
    </div>
  );
}