'use client';

import * as React from 'react';
import { Upload, X, FileImage, HardDrive } from 'lucide-react';
import { cn } from '@/lib/utils/cn';
import { Button } from '@/components/ui/button';

export interface FaviconFileUploadProps {
  onFileSelect: (file: File) => void;
  onFileRemove: () => void;
  selectedFile?: File | null;
  disabled?: boolean;
}

export function FaviconFileUpload({
  onFileSelect,
  onFileRemove,
  selectedFile,
  disabled = false,
}: FaviconFileUploadProps) {
  const [isDragging, setIsDragging] = React.useState(false);
  const [dimensions, setDimensions] = React.useState<string | null>(null);
  const fileInputRef = React.useRef<HTMLInputElement>(null);

  React.useEffect(() => {
    if (selectedFile) {
      const img = new Image();
      img.onload = () => {
        setDimensions(`${img.width} × ${img.height}`);
        URL.revokeObjectURL(img.src);
      };
      img.src = URL.createObjectURL(selectedFile);
    } else {
      setDimensions(null);
    }
  }, [selectedFile]);

  const handleDragEnter = (e: React.DragEvent) => {
    e.preventDefault();
    e.stopPropagation();
    if (!disabled) setIsDragging(true);
  };

  const handleDragLeave = (e: React.DragEvent) => {
    e.preventDefault();
    e.stopPropagation();
    setIsDragging(false);
  };

  const handleDragOver = (e: React.DragEvent) => {
    e.preventDefault();
    e.stopPropagation();
  };

  const handleDrop = (e: React.DragEvent) => {
    e.preventDefault();
    e.stopPropagation();
    setIsDragging(false);

    if (disabled) return;

    const files = Array.from(e.dataTransfer.files);
    if (files.length > 0 && files[0].type.startsWith('image/')) {
      onFileSelect(files[0]);
    }
  };

  const handleFileInput = (e: React.ChangeEvent<HTMLInputElement>) => {
    const files = Array.from(e.target.files || []);
    if (files.length > 0 && files[0].type.startsWith('image/')) {
      onFileSelect(files[0]);
    }
  };

  const handleClick = () => {
    if (!disabled) fileInputRef.current?.click();
  };

  return (
    <div className="w-full space-y-3">
      <input
        ref={fileInputRef}
        type="file"
        className="hidden"
        accept="image/*"
        onChange={handleFileInput}
        disabled={disabled}
      />

      {selectedFile ? (
        <div className="border border-border rounded-lg p-4 bg-card/50 backdrop-blur-sm">
          <div className="flex items-start gap-4">
            <div className="p-2 bg-primary/10 rounded-lg">
              <FileImage className="h-6 w-6 text-primary" />
            </div>
            <div className="flex-1 min-w-0">
              <div className="flex items-start justify-between gap-2">
                <p className="text-sm font-semibold text-foreground truncate" title={selectedFile.name}>
                  {selectedFile.name}
                </p>
                <Button
                  variant="ghost"
                  size="icon-xs"
                  onClick={onFileRemove}
                  disabled={disabled}
                  className="rounded-full hover:bg-destructive/10 hover:text-destructive"
                >
                  <X className="h-3.5 w-3.5" />
                </Button>
              </div>
              <div className="mt-2 flex gap-4 text-[10px] text-muted-foreground uppercase tracking-wider font-bold">
                <div className="flex items-center gap-1.5">
                  <HardDrive className="h-3 w-3" />
                  <span>{(selectedFile.size / 1024).toFixed(1)} KB</span>
                </div>
                {dimensions && (
                  <div className="flex items-center gap-1.5">
                    <FileImage className="h-3 w-3" />
                    <span>{dimensions}</span>
                  </div>
                )}
              </div>
            </div>
          </div>
        </div>
      ) : (
        <div
          onClick={handleClick}
          onDragEnter={handleDragEnter}
          onDragOver={handleDragOver}
          onDragLeave={handleDragLeave}
          onDrop={handleDrop}
          className={cn(
            'border-2 border-dashed rounded-xl p-10 text-center cursor-pointer transition-all duration-300',
            'hover:border-primary/50 hover:bg-primary/5',
            {
              'border-primary bg-primary/10 scale-[0.98]': isDragging,
              'border-border bg-muted/30': !isDragging,
              'opacity-50 cursor-not-allowed': disabled,
            }
          )}
        >
          <div className="bg-primary/10 w-16 h-16 rounded-full flex items-center justify-center mx-auto mb-4">
            <Upload className="h-8 w-8 text-primary" />
          </div>
          <p className="text-sm font-semibold text-foreground mb-1">
            Drop icon source here
          </p>
          <p className="text-xs text-muted-foreground">
            Recommended: 512x512 PNG or SVG
          </p>
        </div>
      )}
    </div>
  );
}