// Example, fetching current firmware version
// In production, the variable current version can be referenced
// to the actual version in production. Using dummy value for now.

//let currentVersion = getVersion();
//document.querySelector('#currentVersion').innerHTML = currentVersion;
// Scenario descriptions
const scenarioOne =
  '<p class="lead mb-4">Current application firmware can process images generated with a simple application binary (not encrypted) and an integrity tag</p>';
const scenarioTwo =
  '<p class="lead mb-4">Current application firmware can process images generated with a cipher application binary (encrypted) and an authentication tag</p>';
const scenarioThree =
  '<p class="lead mb-4">Current application firmware can process images generated with a cipher application binary (encrypted) and a signature</p>';

document.getElementById("scenarioDesc").innerHTML = scenarioOne;

getVersion();

// Accessing metadata about the currently selected file.
let files = null;

async function updateSize() {
  let nBytes = 0,
    oFiles = this.files, // How many files
    nFiles = oFiles.length; // Length of file in bytes
  for (let nFileId = 0; nFileId < nFiles; nFileId++) {
    nBytes += oFiles[nFileId].size; // accumulator to get the final size
  }
  let sOutput = nBytes + " bytes"; // Formatting a nice message
  // optional code for multiples approximation
  const aMultiples = ["KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB"];
  for (
    nMultiple = 0, nApprox = nBytes / 1024;
    nApprox > 1;
    nApprox /= 1024, nMultiple++
  ) {
    sOutput =
      nApprox.toFixed(3) +
      " " +
      aMultiples[nMultiple] +
      " (" +
      nBytes +
      " bytes)";
  }

  files = this.files;

  let ext = this.files[0].name.includes(".img");
  if (ext) {
    //document.getElementById("fileName").innerHTML = this.files[0].name; // Inserting the file name to the DOM
    document.getElementById("fileSize").innerHTML = sOutput; // Inserting the file size to the DOM
    document.getElementById("failure").innerHTML = "";
    document.getElementById("submit").classList.remove("disabled");
    document.getElementById("submit").classList.remove("btn-outline-secondary");
    document.getElementById("submit").classList.add("btn-success");

    document
      .getElementById("step1")
      .classList.remove("list-group-item-success");
    document.getElementById("step2").classList.add("list-group-item-success");
    document
      .getElementById("step3")
      .classList.remove("list-group-item-success");
  } else {
    document.getElementById("success").innerHTML = "";
    document.getElementById("failure").innerHTML =
      "Unknown filetype. Please upload a binary (.img) file.";
    document.getElementById("submit").classList.remove("btn-success");
    document.getElementById("submit").classList.add("btn-outline-secondary");
    document.getElementById("submit").classList.add("disabled");
    this.files = null;
  }
}

function sendFile(file) {
  const uri = "/upload";
  const xhr = new XMLHttpRequest();
  const fd = new FormData();

  xhr.open("POST", uri, true);

  xhr.onreadystatechange = function () {
    if (xhr.readyState === XMLHttpRequest.DONE) {
      let status = xhr.status;
      if (status >= 200 && status < 400) {
        let jsonResponse = JSON.parse(xhr.responseText);
        console.log(jsonResponse);
        document.getElementById("success").innerHTML =
          "Uploaded. Page will reload in 15 seconds...";
      } else {
        document
          .getElementById("step3")
          .classList.remove("list-group-item-success");
        document.getElementById("submit").classList.remove("btn-success");
        document
          .getElementById("submit")
          .classList.add("btn-outline-secondary");
        document.getElementById("submit").classList.add("disabled");
        document.getElementById("failure").innerHTML =
          "An error occurred uploading file.";
      }
    } else {
      document
        .getElementById("step3")
        .classList.remove("list-group-item-success");
      document.getElementById("submit").classList.remove("btn-success");
      document.getElementById("submit").classList.add("btn-outline-secondary");
      document.getElementById("submit").classList.add("disabled");
      document.getElementById("failure").innerHTML =
        "An error occurred uploading file.";
    }
  };

  fd.append("myFile", file);

  // Initiate a multipart/form-data upload
  xhr.send(fd);
}

function getVersion() {
  const uri = "/data.json";
  const xhr = new XMLHttpRequest();

  xhr.open("GET", uri, true);

  xhr.onreadystatechange = function () {
    if (xhr.readyState === XMLHttpRequest.DONE) {
      let status = xhr.status;
      if (status === 0 || (status >= 200 && status < 400)) {
        let jsonResponse = JSON.parse(xhr.responseText);
        let scenarioNo = parseInt(jsonResponse.data.scenario);

        document.getElementById("currentVersion").innerHTML =
          jsonResponse.data.version;
        document.getElementById("success").innerHTML =
          "Current firmware version: " + jsonResponse.data.version;

        //let backgroundColor = "linear-gradient("+ jsonResponse.data.color + ", pink);"
        let backgroundColor = jsonResponse.data.color;
        document.body.setAttribute(
          "style",
          "background-color: " + backgroundColor
        );
        //document.getElementsByClassName("main-block"). =

        if (scenarioNo === 2) {
          document.getElementById("scenarioDesc").innerHTML = scenarioTwo;
        } else if (scenarioNo === 3) {
          document.getElementById("scenarioDesc").innerHTML = scenarioThree;
        } else {
          document.getElementById("scenarioDesc").innerHTML = scenarioOne;
        }
      } else {
        document.getElementById("failure").innerHTML =
          "An error occurred fetching current version.";
      }
    } else {
    }
  };

  //End of request
  xhr.send(null);
}

function fileToByteArray(file) {
  return new Promise((resolve, reject) => {
    try {
      let reader = new FileReader();
      let fileByteArray = [];
      reader.readAsArrayBuffer(file);
      reader.onloadend = (evt) => {
        if (evt.target.readyState == FileReader.DONE) {
          let arrayBuffer = evt.target.result,
            array = new Uint8Array(arrayBuffer);
          for (byte of array) {
            fileByteArray.push(byte);
          }
        }
        resolve(fileByteArray);
      };
    } catch (e) {
      reject(e);
    }
  });
}

function hexToRgbA(hex) {
  var c;
  if (/^#([A-Fa-f0-9]{3}){1,2}$/.test(hex)) {
    c = hex.substring(1).split("");
    if (c.length == 3) {
      c = [c[0], c[0], c[1], c[1], c[2], c[2]];
    }
    c = "0x" + c.join("");
    return (
      "rgba(" + [(c >> 16) & 255, (c >> 8) & 255, c & 255].join(",") + ",1)"
    );
  }
  throw new Error("Bad Hex");
}

// Function to convert a file to bytearray
async function getByteArray(file) {
  //Wait for the file to be converted to a byteArray
  let byteArray = await fileToByteArray(file);

  //Do something with the byteArray
  return byteArray;
  //return res;
}

async function sendFileAsBinary(file) {
  let oReq = new XMLHttpRequest();

  oReq.onload = function (oEvent) {
    // Uploaded.
    //document.getElementById('success').innerHTML = 'Uploaded. Please Click on "Reboot" to proceed.';
  };

  oReq.onreadystatechange = function () {
    let status = oReq.status;
    if (oReq.readyState === XMLHttpRequest.DONE) {
      if (status >= 200 && status < 400) {
        document.getElementById("success").innerHTML =
          "Uploaded. Page will reload in 15 seconds...";
        document.getElementById("failure").innerHTML = "";

        setTimeout(function () {
          document.location.reload();
        }, 15000);
      } else {
        document.getElementById("failure").innerHTML =
          "Unable to upload binary! Please try again.";
        document.getElementById("success").innerHTML = "";
      }
    } else {
    }
  };

  let buffer = await getByteArray(file);
  var blob = new Blob([new Uint8Array(buffer)], {
    type: "application/octet-stream",
  });

  oReq.open("POST", "/upload/binary", true);
  oReq.send(blob);
}

// updateSize() will listen to the "change" event on the file select button.
document
  .getElementById("uploadInput")
  .addEventListener("change", updateSize, false);

let submit = document.getElementById("submit");

submit.addEventListener("click", function (e) {
  e.preventDefault();
  //submit.disabled = true;
  try {
    //sendFile(files[0]) // This is the normal way to upload a file as multi-part form data
    sendFileAsBinary(files[0]); // This is the way to upload if you need a byte stream
    document.getElementById("success").innerHTML = "Uploading file...";
    document.getElementById("submit").classList.remove("btn-success");
    document.getElementById("submit").classList.add("btn-outline-secondary");
    document.getElementById("submit").classList.add("disabled");
  } catch (error) {
    document.getElementById("failure").innerHTML =
      "An error occurred. Please try again.";
    document.getElementById("submit").classList.remove("btn-success");
    document.getElementById("submit").classList.add("btn-outline-secondary");
    document.getElementById("submit").classList.add("disabled");
    document
      .getElementById("step3")
      .classList.remove("list-group-item-success");
  }
});
