portal/web/portal.mjs

import * as Stat from "./stat.mjs"

const Millisecond = 1
const Second = 1000 * Millisecond
const Minute = 60 * Second

class StatApp {
  constructor(parent) {
    this.parent= parent
    this.stat = new Stat.Stat()
    this.chart = new Stat.PieChart(parent, this.stat)

    setInterval(()=>this.update(), 2 * Second)
    setTimeout(()=>this.update(), 500 * Millisecond)
    this.update()
  }

  async update() {
    // Use non-standard checkVisibility method to avoid a pointless update
    if (this.parent.checkVisibility && !this.parent.checkVisibility()) {
      return
    }
    await this.stat.update()
    this.chart.update()
  }
}

let frames = {}
function activate(event, element) {
  event.preventDefault()

  let parent = element.parentElement
  for (let e of parent.getElementsByClassName("active")) {
    e.classList.remove("active")
  }
  element.classList.add("active")
  let href = element.href
  let app = document.querySelector("#app")

  let frame = frames[href]
  if (frame) {
    frame.dispatchEvent(new Event("load"))
  } else {
    frame = app.appendChild(document.createElement("iframe"))
    frame.addEventListener("load", e => frameLoaded(frame))
    frame.src = href
    frames[href] = frame
  }

  for (let fhref in frames) {
    let f = frames[fhref]
    if (fhref == href) {
      f.classList.remove("hidden")
    } else {
      f.classList.add("hidden")
    }
  }
}


function frameLoaded(frame) {
  let doc = frame.contentDocument
  if (doc.title.length > 0) {
    document.title = doc.title
  }
  let icon = document.querySelector("link[rel~='icon']")
  let dicon = doc.querySelector("link[rel~='icon']")
  if (dicon) {
    icon.href = dicon.href
  } else {
    icon.href = defaultIcon
  }
}

let defaultIcon = null
async function init() {
  let doc = document.querySelector("iframe").contentDocument

  defaultIcon = document.querySelector("link[rel~='icon']").href

  for (let l of document.head.querySelectorAll("style")) {
    doc.head.appendChild(l.cloneNode(true))
  }
  for (let l of document.head.querySelectorAll("link[rel='stylesheet']")) {
    doc.head.appendChild(l.cloneNode())
  }
  for (let f of document.querySelectorAll("#app iframe")) {
    frames[f.src] = f
  }


  let icons = doc.body.appendChild(doc.createElement("section"))
  icons.classList.add("icons")

  let nav = document.querySelector("nav")
  let resp = await fetch("portal.json")
  let obj = await resp.json()
  for (let app of obj) {
    let hlink = null
    if (app.target != "_blank") {
      hlink = nav.appendChild(document.createElement("a"))
      hlink.href = app.href
      hlink.textContent = app.title
      if (app.target) {
        hlink.target = app.target
      } else {
        hlink.addEventListener("click", event => activate(event, hlink))
      }
    }

    let dlink = icons.appendChild(doc.createElement("a"))
    dlink.href = app.href
    if (app.target) {
      dlink.target = app.target
    } else {
      dlink.addEventListener("click", event => activate(event, hlink))
    }
    if (app.icon) {
      let icon = dlink.appendChild(doc.createElement("img"))
      icon.src = app.icon
      icon.alt = app.title
      icon.title = app.title
      icon.style.objectFit = "cover"
    } else if (app.app) {
      if (app.app == "stat") {
        new StatApp(dlink)
      }
    } else {
      let text = dlink.appendChild(doc.createElement("div"))
      text.textContent = app.title
    }
  }
}

if (document.readyState === "loading") {
  document.addEventListener("DOMContentLoaded", init)
} else {
  init()
}