[Backend] Type semesters.ts

services/backend/src/models/semester.ts

@@ -1,6 +1,7 @@
 import { Column, CreatedAt, DataType, HasMany, Model, PrimaryKey, Table, UpdatedAt } from 'sequelize-typescript'
 
 import { SemesterEnrollment } from './semesterEnrollment'
+import { Name } from '../types/name'
 
 @Table({
   underscored: true,
@@ -19,7 +20,7 @@ export class Semester extends Model {
   semestercode: number
 
   @Column(DataType.JSONB)
-  name: object
+  name: Name
 
   @Column(DataType.INTEGER)
   startYear: number

services/backend/src/services/semesters.ts

@@ -0,0 +1,57 @@
+import moment from 'moment'
+import { Op } from 'sequelize'
+
+import { Semester } from '../models'
+import { Name } from '../types/name'
+
+type SemestersAndYears = {
+  years: {
+    [yearcode: string]: { yearcode: number; yearname: string; startdate: moment.Moment; enddate: moment.Moment }
+  }
+  semesters: {
+    [semestercode: string]: { semestercode: number; name: Name; yearcode: number; startdate: Date; enddate: Date }
+  }
+}
+
+export const getCurrentSemester = async () => {
+  const today = new Date()
+  const currentSemester = await Semester.findOne({
+    where: {
+      startdate: {
+        [Op.lte]: today,
+      },
+      enddate: {
+        [Op.gte]: today,
+      },
+    },
+  })
+  return currentSemester
+}
+
+export const getSemestersAndYears = async () => {
+  const semesters = await Semester.findAll()
+  const result = semesters.reduce(
+    (acc, semester) => {
+      const { semestercode, name, yearcode, yearname, startdate, enddate } = semester
+      acc.semesters[semestercode] = { semestercode, name, yearcode, startdate, enddate }
+      if (!acc.years[yearcode]) {
+        acc.years[yearcode] = {
+          yearcode,
+          yearname,
+          startdate: moment(startdate),
+          enddate: moment(enddate),
+        }
+      } else {
+        acc.years[yearcode] = {
+          yearcode,
+          yearname,
+          startdate: moment.min(acc.years[yearcode].startdate, moment(startdate)),
+          enddate: moment.max(acc.years[yearcode].enddate, moment(enddate)),
+        }
+      }
+      return acc
+    },
+    { years: {}, semesters: {} } as SemestersAndYears
+  )
+  return result
+}