<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>File Upload with Drag and Drop</title>
<style>
    body {
        font-family: Arial, sans-serif;
        display: flex;
        justify-content: center;
        align-items: center;
        height: 100vh;
        margin: 0;
    }
    .drop-area-container {
        text-align: center;
    }
    .drop-area {
        width: 300px;
        height: 200px;
        border: 2px dashed #ccc;
        border-radius: 10px;
        display: inline-flex;
        justify-content: center;
        align-items: center;
        color: #888;
        font-size: 1.2rem;
        margin-bottom: 20px;
    }
    .drop-area.active {
        border-color: #38a169;
        color: #38a169;
    }
    .file-input {
        display: none;
    }
    .file-input-label {
        display: inline-block;
        padding: 10px 15px;
        background-color: #007bff;
        color: #fff;
        border-radius: 5px;
        cursor: pointer;
        margin-right: 10px;
    }
    .upload-button {
        padding: 10px 20px;
        background-color: #38a169;
        color: #fff;
        border: none;
        border-radius: 5px;
        cursor: pointer;
        margin-top: 10px;
    }
    .file-list {
        margin-top: 20px;
        text-align: left;
    }
    .file-item {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 5px;
        padding: 5px;
        border: 1px solid #ccc;
        border-radius: 5px;
    }
    .cancel-button {
        background-color: #dc3545;
        color: #fff;
        border: none;
        border-radius: 5px;
        padding: 5px;
        cursor: pointer;
    }
</style>
</head>
<body>
<div class="drop-area-container">
    <div class="drop-area" id="dropArea">
        <p>Drag & Drop files here</p>
    </div>
    <label for="fileInput" class="file-input-label">Select files</label>
    <input type="file" id="fileInput" class="file-input" multiple>
    <button id="uploadButton" class="upload-button">Upload</button>

    <div class="file-list" id="fileList"></div>
</div>

<script>
    const dropArea = document.getElementById('dropArea');
    const fileInput = document.getElementById('fileInput');
    const uploadButton = document.getElementById('uploadButton');
    const fileList = document.getElementById('fileList');
    let filesToUpload = []; // Array to store files to upload

    ['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
        dropArea.addEventListener(eventName, preventDefaults, false);
    });

    function preventDefaults(e) {
        e.preventDefault();
        e.stopPropagation();
    }

    ['dragenter', 'dragover'].forEach(eventName => {
        dropArea.addEventListener(eventName, highlight, false);
    });

    ['dragleave', 'drop'].forEach(eventName => {
        dropArea.addEventListener(eventName, unhighlight, false);
    });

    function highlight() {
        dropArea.classList.add('active');
    }

    function unhighlight() {
        dropArea.classList.remove('active');
    }

    dropArea.addEventListener('drop', handleDrop, false);

    function handleDrop(e) {
        let dt = e.dataTransfer;
        let files = dt.files;

        addFilesToUpload(files);
        updateFileList();
    }

    fileInput.addEventListener('change', function(e) {
        let files = this.files;

        addFilesToUpload(files);
        updateFileList();
    });

    function addFilesToUpload(newFiles) {
        filesToUpload = [...filesToUpload, ...newFiles];
    }

    function updateFileList() {
        fileList.innerHTML = ''; // Clear previous file list

        filesToUpload.forEach((file, index) => {
            const fileSize = getFileSize(file.size);
            const listItem = document.createElement('div');
            listItem.classList.add('file-item');
            listItem.innerHTML = `
                <span>${file.name} (${fileSize})</span>
                <button class="cancel-button" data-index="${index}">Cancel</button>
            `;
            fileList.appendChild(listItem);
        });

        document.querySelectorAll('.cancel-button').forEach(button => {
            button.addEventListener('click', removeFile, false);
        });
    }

    function removeFile(e) {
        const index = e.target.dataset.index;
        filesToUpload.splice(index, 1);
        updateFileList();
    }

    function getFileSize(size) {
        if (size === 0) return '0 Bytes';
        const k = 1024;
        const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
        const i = Math.floor(Math.log(size) / Math.log(k));
        return parseFloat((size / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
    }

    uploadButton.addEventListener('click', function() {
        if (filesToUpload.length > 0) {
            // Here you can send filesToUpload to the server or perform other actions
            console.log('Uploading files:', filesToUpload);
            alert('Files uploaded successfully!');
            // Clear the filesToUpload array and update the file list display
            filesToUpload = [];
            updateFileList();
        } else {
            alert('Please select files to upload.');
        }
    });
</script>

</body>
</html>