"use strict";

function getApplicationId() {
  const match = window.location.hash.match(/^#\/job-procedures\/record\/([0-9a-z]{8}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{12})/)
  if (match != null) {
    return match[1]
  }
  throw "Unable to retrieve Application ID";
}

async function getXSRFToken() {
  // we need to go through the background script to get the XSRF-TOKEN cookie
  return browser.runtime.sendMessage(
    { type: "COOKIE", url: "https://personal.uni-graz.at", key: "XSRF-TOKEN" }
  ).then((cookie) => {
    return cookie.value;
  })
}

async function getApplicant(applicant, token) {
  return content.fetch(`https://personal.uni-graz.at/api/erec/job-applications/${applicant.id}`,
    {
      headers: { "X-XSRF-TOKEN": token }
    })
    .then((response) => {
      if (response.ok) {
        return response.json()
      }
      throw `Failed to get applicant ${applicant.id}`
    })
    .then(async (jsonData) => {
      const files = jsonData.application_files ?? []

      await Promise.all(files.map(async (afile) => {
        const response = await content.fetch(
          `https://personal.uni-graz.at/api/erec/download-file/${afile.file_id}`,
          {
            credentials: "same-origin",
            headers: { "X-XSRF-TOKEN": token }
          }
        )

        if (!response.ok) {
          throw `Failed to download file ${afile.file_id} for applicant ${applicant.id}`
        }

        afile.blob = await response.blob()
      }))

      return jsonData
    })
}

async function getApplicants() {
  const aid = getApplicationId()
  const token = await getXSRFToken()
  return content.fetch(`https://personal.uni-graz.at/api/erec/job-applications/procedure/${aid}`,
    {
      credentials: "same-origin",
      headers: { "X-XSRF-TOKEN": token }
    }
  )
    .then((response) => {
      if (response.ok) {
        return response.json()
      }
      throw "Failed to get list of applications"
    })
    .then((jsonData) => {
      const sliced = jsonData.slice(0, 2);
      return Promise.allSettled(sliced.map(async (applicant) => getApplicant(applicant, token)))
    })
}

function sanitizeZipPathSegment(value, fallback = "unnamed") {
  const sanitized = String(value ?? "")
    .replace(/[\/\\:*?"<>|]/g, "_")
    .trim()

  return sanitized === "" ? fallback : sanitized
}

function downloadBlob(blob, fileName) {
  const url = URL.createObjectURL(blob)
  const link = document.createElement("a")

  link.href = url
  link.download = fileName
  link.click()

  setTimeout(() => URL.revokeObjectURL(url), 0)
}

function rip(event) {
  const btn = event.target;
  btn.textContent = "working ..."
  btn.classList.add("loading")
  btn.disabled = true;
  getApplicants()
    .then(async (applicants) => {
      const zip = new JSZip()

      applicants.forEach((result) => {
        if (result.status !== "fulfilled") {
          throw result.reason
        }

        const applicant = result.value
        const dirName = `${applicant.last_name}_${applicant.first_name}`
        // const dirName = `${sanitizeZipPathSegment(applicant.last_name)}_${sanitizeZipPathSegment(applicant.first_name)}`
        const applicantDir = zip.folder(dirName)
        const files = applicant.application_files ?? []

        files.forEach((afile) => {
          if (afile.blob.size > 2_000_000) return;
          const ext = afile.file_name.split(".").slice(-1)
          const filename = `${afile.field_name}.${ext}`
          // const filename = sanitizeZipPathSegment(afile.file_name)
          console.log(filename)
          console.log(afile.blob)
          applicantDir.file(filename, afile.blob)
        })
      })

      const zipBlob = await zip.generateAsync({ type: "blob" })
      downloadBlob(zipBlob, `applications_${getApplicationId()}.zip`)
      btn.textContent = "done"
    })
    // .catch((error) => {
    //   console.error(error)
    //   btn.textContent = "failed"
    //   btn.disabled = false
    // })
    .finally(() => {
      btn.classList.remove("loading")
    })
}

// injection of rip button
function install() {
  const titleTag = document.querySelector("scrm-module-title")

  if (titleTag != null) {
    const a = document.createElement("button")
    a.textContent = "rip"
    a.classList.add("ripper-btn")
    a.addEventListener("click", rip, {
      once: true
    })
    titleTag.append(" (", a, ")")
  } else {
    console.log("could not install button")
  }
}

// we need the observer to restore the button after each page load
const contentObserver = new MutationObserver((mutations) => {
  mutations.forEach(mu => {
    for (const node of mu.removedNodes) {
      if (node.nodeName == "APP-FULL-PAGE-SPINNER") {
        install();
      }
    }
  });
})

contentObserver.observe(document.querySelector("app-root"), { subtree: true, childList: true });

console.log(JSZip.support)