3 files changed, 93 insertions, 45 deletions
diff --git a/lib/getURLOfUser.js b/lib/getURLOfUser.js
new file mode 100644
index 0000000..2de48e6
--- /dev/null
+++ b/lib/getURLOfUser.js
@@ -0,0 +1,8 @@
+const leftPad = require('left-pad') // I imported this just to piss you off ;)
+
+function getURLOfUser (type, index, week) {
+  return `http://www.meetingpointmco.nl/Roosters-AL/doc/dagroosters/` +
+      `${leftPad(week, 2, '0')}/${type}/${type}${leftPad(index + 1, 5, '0')}.htm`
+}
+
+module.exports = getURLOfUser
diff --git a/lib/getURLOfUsers.js b/lib/getURLOfUsers.js
deleted file mode 100644
index 8590ee4..0000000
--- a/lib/getURLOfUsers.js
+++ /dev/null
@@ -1,45 +0,0 @@
-const leftPad = require('left-pad')
-
-// copied from http://www.meetingpointmco.nl/Roosters-AL/doc/dagroosters/untisscripts.js,
-// were using the same code as they do to be sure that we always get the same
-// week number.
-function getWeek () {
-  // Create a copy of this date object
-  var target = new Date()
-
-  // ISO week date weeks start on monday
-  // so correct the day number
-  var dayNr = (target.getDay() + 6) % 7
-
-  // ISO 8601 states that week 1 is the week
-  // with the first thursday of that year.
-  // Set the target date to the thursday in the target week
-  target.setDate(target.getDate() - dayNr + 3)
-
-  // Store the millisecond value of the target date
-  var firstThursday = target.valueOf()
-
-  // Set the target to the first thursday of the year
-  // First set the target to january first
-  target.setMonth(0, 1)
-  // Not a thursday? Correct the date to the next thursday
-  if (target.getDay() !== 4) {
-    target.setMonth(0, 1 + ((4 - target.getDay()) + 7) % 7)
-  }
-
-  // The weeknumber is the number of weeks between the
-  // first thursday of the year and the thursday in the target week
-  return 1 + Math.ceil((firstThursday - target) / 604800000) // 604800000 = 7 * 24 * 3600 * 1000
-}
-
-function getURLOfUsers (weekOffset, type, id) {
-  return `http://www.meetingpointmco.nl/Roosters-AL/doc/dagroosters/` +
-      `${getWeek() + weekOffset}/${type}/${type}${leftPad(id, 5, '0')}.htm`
-}
-
-module.exports = getURLOfUsers
-
-module.exports.CLASS = 'c'
-module.exports.TEACHERS = 't'
-module.exports.ROOMS = 'r'
-module.exports.STUDENTS = 's'
diff --git a/lib/getUserIndex.js b/lib/getUserIndex.js
new file mode 100644
index 0000000..db7daa8
--- /dev/null
+++ b/lib/getUserIndex.js
@@ -0,0 +1,85 @@
+'use strict'
+
+const Promise = require('bluebird')
+const cheerio = require('cheerio')
+const request = Promise.promisify(require('request'))
+
+let userIndex
+let lastUpdate
+
+function updateUserIndex () {
+  return new Promise(function (resolve, reject) {
+    process.stdout.write('Updating user index... ')
+    request(`http://www.meetingpointmco.nl/Roosters-AL/doc/dagroosters/frames/navbar.htm`)
+      .then(function (page) {
+        lastUpdate = new Date()
+        page = page.body
+
+        const $ = cheerio.load(page)
+        const $script = $('script').eq(1)
+        const scriptText = $script.text()
+
+        const regexs = [/var classes = \[(.+)];/, /var teachers = \[(.+)];/, /var rooms = \[(.+)];/, /var students = \[(.+)];/]
+        const items = regexs.map(function (regex) {
+          return scriptText.match(regex)[1].split(',').map(function (item) {
+            return item.replace(/"/g, '')
+          })
+        })
+
+        userIndex = ([]
+        .concat(items[0].map(function (item, index) {
+          return {
+            type: 'c',
+            value: item,
+            index: index
+          }
+        }))
+        .concat(items[1].map(function (item, index) {
+          return {
+            type: 't',
+            value: item,
+            index: index
+          }
+        }))
+        .concat(items[2].map(function (item, index) {
+          return {
+            type: 'r',
+            value: item,
+            index: index
+          }
+        }))
+        .concat(items[3].map(function (item, index) {
+          return {
+            type: 's',
+            value: item,
+            index: index
+          }
+        })))
+
+        process.stdout.write('done.\n')
+
+        resolve(userIndex)
+      })
+      .catch(error => {
+        process.stdout.write('failed.\n')
+        reject(error)
+      })
+  })
+}
+
+function getUserIndex () {
+  return new Promise((resolve, reject) => {
+    if (lastUpdate == null) {
+      updateUserIndex().then(resolve, reject)
+    } else if (new Date() - lastUpdate > 10 * 60 * 1000) { // 10 minutes
+      updateUserIndex().then(resolve, function () {
+        console.warn('Unable to update userIndex, using cached.')
+        resolve(userIndex)
+      })
+    } else {
+      resolve(userIndex)
+    }
+  })
+}
+
+module.exports = getUserIndex