// jshint asi:true

var teamId
var heartbeatInterval = 40000

function toast(message, timeout=5000) {
  let p = document.createElement("p")
  
  p.innerText = message
  document.getElementById("messages").appendChild(p)
  setTimeout(
    e => { p.remove() },
    timeout
  )
}

function renderPuzzles(obj) {
  let puzzlesElement = document.createElement('div')
  
  // Create a sorted list of category names
  let cats = Object.keys(obj)
  cats.sort()
  for (let cat of cats) {
    if (cat.startsWith("__")) {
      // Skip metadata
      continue
    }
    let puzzles = obj[cat]
    
    let pdiv = document.createElement('div')
    pdiv.className = 'category'
    
    let h = document.createElement('h2')
    pdiv.appendChild(h)
    h.textContent = cat
    
    // Extras if we're running a devel server
    if (obj.__devel__) {
      let a = document.createElement('a')
      h.insertBefore(a, h.firstChild)
      a.textContent = "⬇️"
      a.href = "mothballer/" + cat + ".mb"
      a.classList.add("mothball")
      a.title = "Download a compiled puzzle for this category"
    }
    
    // List out puzzles in this category
    let l = document.createElement('ul')
    pdiv.appendChild(l)
    for (let puzzle of puzzles) {
      let points = puzzle[0]
      let id = puzzle[1]
  
      let i = document.createElement('li')
      l.appendChild(i)
      i.textContent = " "
  
      if (points === 0) {
        // Sentry: there are no more puzzles in this category
        i.textContent = "✿"
      } else {
        let a = document.createElement('a')
        i.appendChild(a)
        a.textContent = points
        a.href = "puzzle.html?cat=" + cat + "&points=" + points + "&pid=" + id
      }
    }
    
    puzzlesElement.appendChild(pdiv)
  }
    
  // Drop that thing in
  let container = document.getElementById("puzzles")
  while (container.firstChild) {
    container.firstChild.remove()
  }
  container.appendChild(puzzlesElement)
}

function heartbeat(teamId) {
  fetch("puzzles.json?id=" + teamId)
  .then(resp => {
    if (resp.ok) {
      resp.json()
      .then(renderPuzzles)
      .catch(err => {
        toast("Error fetching recent puzzles. I'll try again in a moment.")
        console.log(err)
      })
    }
  })
  .catch(err => {
    toast("Error fetching recent puzzles. I'll try again in a moment.")
    console.log(err)
  })
}

function showPuzzles(teamId) {
  let spinner = document.createElement("span")
  spinner.classList.add("spinner")

  sessionStorage.setItem("id", teamId)

  document.getElementById("login").style.display = "none"
  document.getElementById("puzzles").appendChild(spinner)
  heartbeat(teamId)
  setInterval(e => { heartbeat(teamId) }, 40000)
  drawCacheButton(teamId)
}

function drawCacheButton(teamId) {
  let cacher = document.createElement("li")
  let cache_button = document.createElement("a")
  cache_button.innerText = "Cache"
  cache_button.title = "Cache an offine copy of current content"
  cache_button.href = "#"
  cache_button.addEventListener("click", async function() {
    toast("Caching all currently-open content")
    await fetchAll(teamId)
    toast("Done caching content")
  })
  cacher.appendChild(cache_button)
  document.getElementsByTagName("nav")[0].getElementsByTagName("ul")[0].appendChild(cacher)

  function updateCacheButton() {
    let headers = new Headers()
    headers.append("pragma", "no-cache")
    headers.append("cache-control", "no-cache")
    fetch("current_manifest.json?id=" + teamId, {method: "HEAD", headers: headers})
      .then(resp => {
        if (resp.ok) {
          cacher.style.disply = "initial"
        } else {
          cacher.style.display = "none"
        }
      })
      .catch(ex => {
          cacher.style.display = "none"
      })
  }

  setInterval ( updateCacheButton , 30000)
  updateCacheButton()
}

async function fetchAll(teamId) {
  let headers = new Headers()
  headers.append("pragma", "no-cache")
  headers.append("cache-control", "no-cache")
  requests = []

  requests.push( fetch("current_manifest.json?id=" + teamId, {headers: headers})
   .then(resp => {
    if (resp.ok) {
      resp.json()
       .then(contents => {
        console.log("Processing manifest")
        for (let resource of contents) {
          if (resource == "puzzles.json") {
            continue
          }
          fetch(resource)
           .then(e => {
            console.log("Fetched " + resource)
          })
        }
      })
   }
  }))

  let resp = await fetch("puzzles.json?id=" + teamId, {headers: headers})
	
  if (resp.ok) {
    let categories = await resp.json()
    let cat_names = Object.keys(categories)
    cat_names.sort()
    for (let cat_name of cat_names) {
      if (cat_name.startsWith("__")) {
        // Skip metadata
        continue
      }
      let puzzles = categories[cat_name]
      for (let puzzle of puzzles) {
        let url = "puzzle.html?cat=" + cat_name + "&points=" + puzzle[0] + "&pid=" + puzzle[1]
        requests.push( fetch(url)
         .then(e => {
          console.log("Fetched " + url)
        }))
      }
    }
  }
  return Promise.all(requests)
}

function login(e) {
  e.preventDefault()
  let name = document.querySelector("[name=name]").value
  let id = document.querySelector("[name=id]").value
  
  fetch("register", {
    method: "POST",
    body: new FormData(e.target),
  })
  .then(resp => {
    if (resp.ok) {
      resp.json()
      .then(obj => {
        if (obj.status == "success") {
          toast("Team registered")
          showPuzzles(id)
        } else if (obj.data.short == "Already registered") {
          toast("Logged in with previously-registered team name")
          showPuzzles(id)
        } else {
          toast(obj.data.description)
        }
      })
      .catch(err => {
        toast("Oops, the server has lost its mind. You probably need to tell someone so they can fix it.")
        console.log(err, resp)
      })
    } else {
      toast("Oops, something's wrong with the server. Try again in a few seconds.")
      console.log(resp)
    }
  })
  .catch(err => {
    toast("Oops, something went wrong. Try again in a few seconds.")
    console.log(err)
  })
}

function init() {
  // Already signed in?
  let id = sessionStorage.getItem("id")
  if (id) {
    showPuzzles(id)
  }

  document.getElementById("login").addEventListener("submit", login)
}

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