function draw_bytes(data) {
    const canvas = document.getElementById("blob");
    const ctx = canvas.getContext("2d");
    const colorScale = chroma.scale(['#4c6c81', '#9c2f2f']).mode('lch');

    const numBlocks = Math.ceil(data.meta.sizeb / 1200);
    const blockSize = canvas.width / numBlocks;

    ctx.fillStyle = "#ddd";
    ctx.fillRect(0, 0, canvas.width, canvas.height);

    // console.log("size: " + data.meta.sizeb);
    // console.log("numblocks: " + numBlocks);
    data.offsets.forEach((offset, idx) => {
        const start = Math.floor((offset.start / data.meta.sizeb) * numBlocks);
        const end = Math.ceil((offset.end / data.meta.sizeb) * numBlocks);
        // console.log(offset.d + ": " + start + ", " + end + " | " + offset.start + ", " + offset.end);
        ctx.fillStyle = colorScale(idx / data.offsets.length).alpha(0.2);
        ctx.fillRect(start * blockSize, 0, (end - start) * blockSize, canvas.height);
    });

    canvas.addEventListener('mousemove', function(event) {
        const rect = canvas.getBoundingClientRect();
        const mouseX = event.clientX - rect.left;
        const mouseY = event.clientY - rect.top;
    
        const tooltips = [];
    
        data.offsets.forEach((offset, idx) => {
            const start = Math.floor((offset.start / data.meta.sizeb) * numBlocks);
            const end = Math.ceil((offset.end / data.meta.sizeb) * numBlocks);
            const rectX = start * blockSize;
            const rectY = 0;
            const rectWidth = (end - start) * blockSize;
            const rectHeight = canvas.height;
    
            if (mouseX >= rectX && mouseX <= rectX + rectWidth && mouseY >= rectY && mouseY <= rectY + rectHeight) {
                const tooltipText = `     ${first_substr(offset.d)}`;
                const tooltipWidth = ctx.measureText(tooltipText).width + 20;
                const tooltipHeight = 30;
    
                let tooltipX = mouseX + 10;
                let tooltipY = mouseY - tooltipHeight - 10;
    
                if (tooltipX + tooltipWidth > canvas.width) {
                    tooltipX = canvas.width - tooltipWidth;
                }
    
                if (tooltipY < 0) {
                    tooltipY = 0;
                }
    
                // Check for overlapping tooltips
                for (let i = 0; i < tooltips.length; i++) {
                    const otherTooltip = tooltips[i];
    
                    if (tooltipX < otherTooltip.x + otherTooltip.width &&
                        tooltipX + tooltipWidth > otherTooltip.x &&
                        tooltipY < otherTooltip.y + otherTooltip.height &&
                        tooltipY + tooltipHeight > otherTooltip.y) {
    
                        // Overlapping, adjust the position
                        tooltipX = otherTooltip.x + otherTooltip.width + 10;
    
                        if (tooltipX + tooltipWidth > canvas.width) {
                            tooltipX = mouseX - tooltipWidth - 10;
                        }
    
                        if (tooltipX < 0) {
                            tooltipX = 0;
                        }
    
                        tooltipY = otherTooltip.y;
                    }
                }
    
                tooltips.push({
                    x: tooltipX,
                    y: tooltipY,
                    width: tooltipWidth,
                    height: tooltipHeight
                });
    
                ctx.fillStyle = '#fff';
                ctx.fillRect(tooltipX, tooltipY, tooltipWidth, tooltipHeight);
    
                ctx.fillStyle = '#000';
                ctx.font = '.6em Arial';
                ctx.fillText(tooltipText, tooltipX + 10, tooltipY + 20);
                // colored circle
                const circleSize = 10;
                ctx.fillStyle = colorScale(idx / data.offsets.length).alpha(0.2);
                ctx.beginPath();
                ctx.arc(tooltipX + 15, tooltipY + 15, circleSize / 2, 0, 2 * Math.PI);
                ctx.fill();
                // re-draw the rest
                ctx.fillStyle = colorScale(idx / data.offsets.length).alpha(0.2);
                ctx.fillRect(start * blockSize, 0, (end - start) * blockSize, canvas.height);
            }
        });
    });
    
    canvas.addEventListener('mouseout', function(event) {
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        data.offsets.forEach((offset, idx) => {
            const start = Math.floor((offset.start / data.meta.sizeb) * numBlocks);
            const end = Math.ceil((offset.end / data.meta.sizeb) * numBlocks);
            ctx.fillStyle = colorScale(idx / data.offsets.length).alpha(0.2);
            ctx.fillRect(start * blockSize, 0, (end - start) * blockSize, canvas.height);
        });
    });
}

// function create_listing(listing) {
//     const ul = document.createElement('ul');
//     ul.classList.add("tree-padding", "tree-vertical-lines", "tree-horizontal-lines", "tree-summaries", "tree-markers", "tree-buttons")

//     for (const key in listing) {
//         const value = listing[key];

//         if (typeof value == 'object') {
//             const li = document.createElement('li');
//             const summary = document.createElement('summary');
//             summary.innerText = key;
//             li.appendChild(summary);

//             const nestedUl = create_listing(value);
//             li.appendChild(nestedUl);
//             ul.appendChild(li);
//         } else {
//             const li = document.createElement('li');
//             const summary = document.createElement('summary');
//             summary.classList.add('no-pico');
//             summary.innerText = `${key} (${value.s})`;
//             li.appendChild(summary);
//             ul.appendChild(li);
//         }
//     }
//     return ul;
// }

function file_summaries(data) {
    const ul = document.createElement('ul');
    for (const [key, val] of Object.entries(data.ql)) {
        const li = document.createElement('li');
        li.textContent = `${val}`;
        ul.appendChild(li);
    }
    return ul;
}

function create_listing(listing) {
    const ul = document.createElement('ul');

    for (const key in listing) {
        const value = listing[key];

        if ('s' in value) {
            const li = document.createElement('li');
            li.innerText = `${key} (${bytes_to_human(value.s)})`;
            ul.appendChild(li);
        }
        else { // (typeof value === 'object') {
            const li = document.createElement('li');

            li.innerText = `${key}/`;

            const nestedUl = create_listing(value);

            li.appendChild(nestedUl);
            ul.appendChild(li);
        }
    }
    return ul;
}

function bytes_to_human(bytes) {
    num = parseInt(bytes);
	const units = ["B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"];
	let i =0;
	while (num >= 1024 && i < units.length - 1) {
		num /= 1024;
		i++;
	}
	return num.toFixed(2) + " " + units[i];
}

function first_substr(description) {
    const index = description.indexOf(',');
    if (index === -1) {
        return description;
    } else {
        return description.substring(0, index);
    }
}

async function process_upload(file) {
    const formData = new FormData();
    formData.append('file', file);

    const button = document.querySelector('button');
    button.setAttribute('aria-busy', 'true');
    button.textContent = `processing ${file.name}...`;
  
    const response = await fetch('api/upload_file', {
      method: 'POST',
      body: formData,
      timeout: 600000 // 10 minutes
    });
  
    if (response.ok) {
    // if (1 === 1) {
      const data = await response.json();
    //   const json = '{"meta":{"name":"miwifi_r4av2_firmware_6bdd4_2.30.500.bin","sizeb":13632488,"sha1":"6cefd9d5de3b80799d0341b19043d108624dcaca","md5":"639616a5b70983903ccdd019a7a6bdd4","sig_quant":411,"duration":"00:05.457"},"offsets":[{"start":960,"end":13630770,"d":"LZMA compressed data"},{"start":1704660,"end":13621866,"d":"Squashfs filesystem"},{"start":4534008,"end":5267984,"d":"xz compressed data"},{"start":5258380,"end":5267984,"d":"ASCII cpio archive"}]}';
    //   const data = JSON.parse(json);

      const container = document.querySelector('.container');
  
      // visualization
      container.innerHTML = `
<div id="blob-row">
<canvas id="blob" width="1200px" height="60px" style="background-color: #18232c;"></canvas>
</div>
<div id="info-row">
<h4 style="margin-bottom:0.5em;">${data.meta.name}</h4>
<details open>
    <summary>blob meta</summary>
    <figure>
        <table role="grid">
            <tr>
                <th><strong>input filename:</strong></th>
                <td>${data.meta.name}</td>
            </tr>
            <tr>
                <th><strong>process duration:</strong></th>
                <td>${data.meta.duration}</td>
            </tr>
            <tr>
                <th><strong>file size in bytes:</strong></th>
                <td>${data.meta.sizeb} (${bytes_to_human(data.meta.sizeb)})</td>
            </tr>
            <tr>
                <th><strong>files discovered:</strong></th>
                <td>${data.meta.files}</td>
            </tr>
            <tr>
                <th><strong>directories unpacked:</strong></th>
                <td>${data.meta.dirs}</td>
            </tr>
            <tr>
                <th><strong>signatures tried:</strong></th>
                <td>${data.meta.sig_quant}</td>
            </tr>
            <tr>
                <th><strong>sha1 hash:</strong></th>
                <td>${data.meta.sha1}</td>
            </tr>
            <tr>
                <th><strong>md5 hash:</strong></th>
                <td>${data.meta.md5}</td>
            </tr>
        </table>
    </figure>
</details>

<details open>
    <summary>binwalk extraction log</summary>
    <small>
    <div id="quick-look"></div>
    </small>
</details>

<details>
    <summary>full file listing</summary>
    <small>
    <div id="file-list"></div>
    </small>
</details>

<details>
    <summary>raw json response (dev)</summary>
    <pre>${JSON.stringify(data, null, 2)}</pre>
</details>
</div>`;
    draw_bytes(data);

    const file_list = document.getElementById('file-list');
    file_list.appendChild(create_listing(data.ls[Object.keys(data.ls)[0]]));

    const quick_look = document.getElementById('quick-look');
    quick_look.appendChild(file_summaries(data));
    } else {
      console.error('error uploading file');
    }
  }
  
  function upload_file() {
    const fileInput = document.createElement('input');
    fileInput.type = 'file';
    fileInput.addEventListener('change', (event) => {
      const file = event.target.files[0];
      process_upload(file);
    });
    fileInput.click();
  }