'use client';

import { Copy, Share2, Image as ImageIcon, FileCode, QrCode } from 'lucide-react';
import { cn, actionBtn } from '@/lib/utils';
import type { ExportSize } from '@/types/qrcode';

interface QRPreviewProps {
  svgString: string;
  isGenerating: boolean;
  exportSize: ExportSize;
  onExportSizeChange: (size: ExportSize) => void;
  onCopyImage: () => void;
  onShare: () => void;
  onDownloadPng: () => void;
  onDownloadSvg: () => void;
}

const EXPORT_SIZES: { value: ExportSize; label: string }[] = [
  { value: 256, label: '256' },
  { value: 512, label: '512' },
  { value: 1024, label: '1k' },
  { value: 2048, label: '2k' },
];


export function QRPreview({
  svgString,
  isGenerating,
  exportSize,
  onExportSizeChange,
  onCopyImage,
  onShare,
  onDownloadPng,
  onDownloadSvg,
}: QRPreviewProps) {
  return (
    <div className="glass rounded-xl p-4 flex flex-col flex-1 min-h-0 overflow-hidden">

      {/* Action bar */}
      <div className="flex items-center gap-1.5 mb-4 shrink-0 flex-wrap">
        <span className="text-[10px] font-semibold text-muted-foreground uppercase tracking-widest mr-auto">
          Preview
        </span>

        <button onClick={onCopyImage} disabled={!svgString} className={actionBtn}>
          <Copy className="w-3 h-3" />Copy
        </button>

        <button onClick={onShare} disabled={!svgString} className={actionBtn}>
          <Share2 className="w-3 h-3" />Share
        </button>

        {/* PNG + inline size selector */}
        <div className="flex items-center glass rounded-md border border-border/30">
          <button
            onClick={onDownloadPng}
            disabled={!svgString}
            className="flex items-center gap-1 pl-2.5 pr-1.5 py-1 text-xs text-muted-foreground hover:text-primary transition-all disabled:opacity-40 disabled:cursor-not-allowed border-r border-border/20"
          >
            <ImageIcon className="w-3 h-3" />PNG
          </button>
          <div className="flex items-center px-1 gap-0.5">
            {EXPORT_SIZES.map(({ value, label }) => (
              <button
                key={value}
                onClick={() => onExportSizeChange(value)}
                className={cn(
                  'text-[9px] font-mono px-1.5 py-0.5 rounded transition-all',
                  exportSize === value
                    ? 'text-primary bg-primary/10'
                    : 'text-muted-foreground/40 hover:text-muted-foreground'
                )}
              >
                {label}
              </button>
            ))}
          </div>
        </div>

        <button onClick={onDownloadSvg} disabled={!svgString} className={actionBtn}>
          <FileCode className="w-3 h-3" />SVG
        </button>
      </div>

      {/* QR canvas */}
      <div
        className="flex-1 min-h-0 rounded-xl flex items-center justify-center"
        style={{
          backgroundImage: 'repeating-conic-gradient(rgba(255,255,255,0.025) 0% 25%, transparent 0% 50%)',
          backgroundSize: '16px 16px',
        }}
      >
        {isGenerating ? (
          <div className="w-56 h-56 rounded-xl bg-white/5 animate-pulse" />
        ) : svgString ? (
          <div
            className="w-full max-w-sm aspect-square [&>svg]:w-full [&>svg]:h-full p-6"
            dangerouslySetInnerHTML={{ __html: svgString }}
          />
        ) : (
          <div className="flex flex-col items-center gap-3 text-center">
            <div className="w-14 h-14 rounded-full bg-primary/10 flex items-center justify-center">
              <QrCode className="w-6 h-6 text-primary/40" />
            </div>
            <div>
              <p className="text-sm font-medium text-foreground/40">No QR code yet</p>
              <p className="text-[10px] text-muted-foreground/30 font-mono mt-1">Enter text or a URL to generate</p>
            </div>
          </div>
        )}
      </div>
    </div>
  );
}