Merge branch 'trunk' of github.com:UniversityOfHelsinkiCS/oodikone into trunk

services/backend/oodikone2-backend/src/sisoodi_diff/students/matchExactlyOneCourse.js

@@ -0,0 +1,50 @@
+// Idea here is to find exactly one matching course or fail otherwise.
+const { mayhemifiedDatesMatch } = require('../utils')
+
+const filterByDate = (date, courses) => courses.filter(course => mayhemifiedDatesMatch(course.date, date))
+
+const filterByCode = (code, courses) => courses.filter(({ course }) => course.code === code)
+
+const filterByCredits = (credits, courses) => courses.filter(course => course.credits === credits)
+
+const coursesMatch = (a, b) =>
+  a.course.code === b.course.code && a.credits === b.credits && mayhemifiedDatesMatch(a.date, b.date)
+
+const matchExactlyOneCourse = (courseToPair, courses) => {
+  const { code } = courseToPair.course
+  const codeMatches = filterByCode(code, courses)
+
+  if (codeMatches.length === 0) {
+    console.log('ERROR! Could not match courses.')
+    throw new Error()
+  }
+
+  if (codeMatches.length === 1 && coursesMatch(courseToPair, codeMatches[0])) {
+    return codeMatches[0]
+  }
+
+  // Need to filter by date.
+  const { date, credits } = courseToPair
+  const dateMatches = filterByDate(date, codeMatches)
+
+  if (dateMatches.length === 0) {
+    console.log('ERROR! Could not match courses.')
+    throw new Error()
+  }
+
+  if (dateMatches.length === 1 && coursesMatch(courseToPair, dateMatches[0])) {
+    return dateMatches[0]
+  }
+
+  // Need to filter by credit.
+  const creditsMatches = filterByCredits(credits, dateMatches)
+
+  if (creditsMatches.length !== 1) {
+    console.log('ERROR! Could not match courses.')
+    throw new Error()
+  }
+
+  return creditsMatches[0]
+}
+
+module.exports = matchExactlyOneCourse

services/backend/oodikone2-backend/src/sisoodi_diff/utils.js

@@ -0,0 +1,24 @@
+const moment = require('moment')
+
+// Because seriously omfg
+const mayhemifiedDatesMatch = (a, b) => {
+  // Figure out which one is from oodi.
+  let oodi, sis
+  if (moment(a).hour() === 0) {
+    sis = a
+    oodi = b
+  } else {
+    oodi = a
+    sis = b
+  }
+
+  // Then figure out if it's DST and fix the "timezone".
+  const dst = moment(oodi).hour() === 21
+  const tzFix = dst ? 3 : 2
+  const oodiDate = moment(oodi).add(tzFix, 'hours')
+  return oodiDate.isSame(sis)
+}
+
+module.exports = {
+  mayhemifiedDatesMatch
+}