/**
 * PrintButton — reusable button with dropdown for Print and PDF export.
 * Uses lucide-react icons and clsx for styling.
 */

import React, { useState, useRef, useEffect, useCallback } from 'react';
import clsx from 'clsx';
import { Printer, FileDown, ChevronDown } from 'lucide-react';
import { printElement, printCurrentPage, exportToPDF } from '@/utils/print';

export interface PrintButtonProps {
  /** Element id to print. If omitted, prints the whole page. */
  targetId?: string;
  /** Filename suggestion for PDF export. */
  filename?: string;
  /** Additional Tailwind classes for the trigger button. */
  className?: string;
}

export function PrintButton({
  targetId,
  filename = 'export',
  className,
}: PrintButtonProps) {
  const [open, setOpen] = useState(false);
  const containerRef = useRef<HTMLDivElement>(null);

  // Close dropdown when clicking outside
  useEffect(() => {
    if (!open) return;
    const handleClickOutside = (e: MouseEvent) => {
      if (containerRef.current && !containerRef.current.contains(e.target as Node)) {
        setOpen(false);
      }
    };
    const handleEscape = (e: KeyboardEvent) => {
      if (e.key === 'Escape') setOpen(false);
    };
    document.addEventListener('mousedown', handleClickOutside);
    document.addEventListener('keydown', handleEscape);
    return () => {
      document.removeEventListener('mousedown', handleClickOutside);
      document.removeEventListener('keydown', handleEscape);
    };
  }, [open]);

  const handlePrint = useCallback(() => {
    setOpen(false);
    if (targetId) {
      printElement(targetId);
    } else {
      printCurrentPage();
    }
  }, [targetId]);

  const handleExportPDF = useCallback(() => {
    setOpen(false);
    if (targetId) {
      exportToPDF(targetId, filename);
    } else {
      // No specific element — use whole-page print which user can save as PDF
      printCurrentPage();
    }
  }, [targetId, filename]);

  return (
    <div ref={containerRef} className="relative inline-block" data-no-print>
      <button
        type="button"
        onClick={() => setOpen((v) => !v)}
        className={clsx(
          'inline-flex items-center gap-1.5 px-2.5 py-1.5 rounded-md',
          'text-sm font-medium text-secondary-700',
          'border border-secondary-300 bg-white',
          'hover:bg-secondary-50 transition-colors',
          'min-h-touch',
          open && 'ring-2 ring-primary-500 ring-offset-1',
          className,
        )}
        aria-haspopup="menu"
        aria-expanded={open}
        aria-label="Drucken oder als PDF exportieren"
        title="Drucken / PDF"
        data-testid="print-button-trigger"
      >
        <Printer className="w-4 h-4" aria-hidden="true" strokeWidth={2} />
        <span className="hidden sm:inline">Drucken</span>
        <ChevronDown
          className={clsx('w-3.5 h-3.5 transition-transform', open && 'rotate-180')}
          aria-hidden="true"
          strokeWidth={2}
        />
      </button>

      {open && (
        <div
          role="menu"
          className={clsx(
            'absolute right-0 mt-1 z-50',
            'min-w-[180px] rounded-md border border-secondary-200',
            'bg-white shadow-lg py-1',
          )}
          data-testid="print-button-dropdown"
        >
          <button
            type="button"
            onClick={handlePrint}
            className={clsx(
              'flex items-center gap-2 w-full px-3 py-2',
              'text-sm text-secondary-700 hover:bg-secondary-50',
              'transition-colors text-left',
            )}
            role="menuitem"
            data-testid="print-button-print"
          >
            <Printer className="w-4 h-4 text-secondary-500" aria-hidden="true" strokeWidth={2} />
            <span>Drucken</span>
          </button>
          <button
            type="button"
            onClick={handleExportPDF}
            className={clsx(
              'flex items-center gap-2 w-full px-3 py-2',
              'text-sm text-secondary-700 hover:bg-secondary-50',
              'transition-colors text-left',
            )}
            role="menuitem"
            data-testid="print-button-pdf"
          >
            <FileDown className="w-4 h-4 text-secondary-500" aria-hidden="true" strokeWidth={2} />
            <span>Als PDF</span>
          </button>
        </div>
      )}
    </div>
  );
}