import React, { useState, useEffect, useCallback } from 'react';
import axiosInstance from '../src/axiosSecure'; // Adjust the import path as needed
import { CircularProgress } from '@mui/material'; // Import MUI CircularProgress for loading indicator

const FileUploadWithPreview = ({ name, value, prefix, onUpload, label }) => {
    // Function to transform the original image URL to its corresponding thumbnail URL
    function transformToThumbnailUrl(originalUrl) {
        if (!originalUrl) return null;
        if (originalUrl.includes("thumb")) return originalUrl; // If the URL already contains 'thumb', return it as-is
        const parts = originalUrl.split('/');
        parts.splice(parts.length - 1, 0, 'thumb'); // Insert 'thumb' before the filename
        return parts.join('/');
    }

    // State for the thumbnail URL
    const [thumbnail, setThumbnail] = useState(value ? transformToThumbnailUrl(value) : null);
    const [isDragging, setIsDragging] = useState(false);
    const [isUploading, setIsUploading] = useState(false); // New state for tracking upload status

    useEffect(() => {
        setThumbnail(value ? transformToThumbnailUrl(value) : null);
    }, [value]);

    const handleDragEnter = useCallback((e) => {
        e.preventDefault();
        e.stopPropagation();
        setIsDragging(true);
    }, []);

    const handleDragLeave = useCallback((e) => {
        e.preventDefault();
        e.stopPropagation();
        setIsDragging(false);
    }, []);

    const handleDragOver = useCallback((e) => {
        e.preventDefault();
        e.stopPropagation();
    }, []);

    const handleDrop = useCallback((e) => {
        e.preventDefault();
        e.stopPropagation();
        setIsDragging(false);
        const { files: droppedFiles } = e.dataTransfer;
        processFile(droppedFiles[0]); // Process only the first dropped file
    }, []);

    const processFile = async (file) => {
        if (!file) return;

        setIsUploading(true); // Start uploading
        const formData = new FormData();
        formData.append('image', file);
        formData.append('prefix', prefix);
        setThumbnail("/");

        try {
            const response = await axiosInstance.post('upload', formData);
            const uploadedFile = response.data[0];

            // Update state with the new thumbnail URL
            setThumbnail(uploadedFile.thumbUrl);

            // Invoke callback if provided
            if (onUpload) {
                onUpload(name, uploadedFile.originalUrl);
            }
        } catch (error) {
            console.error('Error uploading image:', error);
        } finally {
            setIsUploading(false); // End uploading
        }
    };

    const handleFilesChange = (e) => {
        processFile(e.target.files[0]); // Process only the first selected file
    };

    return (
        <div className="p-2 border-dashed border-2 border-gray-200 dark:border-gray-600 rounded-lg">
            <label htmlFor={`${name}-file-upload`} className="block text-sm font-medium text-gray-700 mb-1">
                {label || 'Upload Image'}
            </label>
            <input id={`${name}-file-upload`} type="file" accept="image/*" onChange={handleFilesChange} className="hidden" />
            <div className={`flex flex-col items-center justify-center p-4 ${isDragging ? 'bg-gray-100 dark:bg-gray-700' : 'bg-white dark:bg-gray-800'}`}
                onDragEnter={handleDragEnter}
                onDragLeave={handleDragLeave}
                onDragOver={handleDragOver}
                onDrop={handleDrop}>
                {isUploading ? (
                    <CircularProgress /> // Show loading indicator while uploading
                ) : (
                    <>
                        <p className="text-gray-600 dark:text-gray-300 text-xs mb-2">Поставете сникма тук, или изберете файл с бутона</p>
                        <button className="btn bg-blue-500 hover:bg-blue-700 text-white font-bold text-xs py-1 px-2 rounded"
                            onClick={(e) => { e.preventDefault(); document.getElementById(`${name}-file-upload`).click(); }}>
                            Избери сникма
                        </button>
                    </>
                )}
                {
                    thumbnail && (
                        <div className="mt-2 flex justify-center">
                            <div className="max-w-xs max-h-64 overflow-hidden rounded-md">
                                <img src={thumbnail} alt="Thumbnail" className="object-contain w-full h-full" />
                            </div>
                        </div>
                    )
                }
            </div>
        </div>
    );
};

export default FileUploadWithPreview;
