Add default mandate dates (Closes #151) (#967)

* Added default values for mandate periods

* Added default null value for memberId in form

* Fixed default mandate dates

* Added comment explaining the add month logic

* Fixed formatting

---------

Co-authored-by: erikekberg <er7030ek-s@student.lu.se>

Author: erikekberg

src/database/prisma/migrations/20251110171304_add_mandate_dates/migration.sql

@@ -0,0 +1,3 @@
+-- AlterTable
+ALTER TABLE "positions" ADD COLUMN     "end_month" INTEGER NOT NULL DEFAULT 11,
+ADD COLUMN     "start_month" INTEGER NOT NULL DEFAULT 0;

src/database/prisma/schema.prisma

@@ -603,6 +603,8 @@ model Position {
   boardMember   Boolean      @default(false) @map("board_member")
   descriptionSv String?      @map("description_sv")
   descriptionEn String?      @map("description_en")
+  startMonth    Int          @default(0) @map("start_month")
+  endMonth      Int          @default(11) @map("end_month")
   committee     Committee?   @relation(fields: [committeeId], references: [id], onDelete: NoAction, onUpdate: NoAction, map: "positions_committee_id_foreign")
   emailAliases  EmailAlias[]
   mandates      Mandate[]

src/database/schema.zmodel

@@ -723,6 +723,8 @@ model Position {
   boardMember   Boolean      @default(false) @map("board_member")
   descriptionSv String?      @map("description_sv")
   descriptionEn String?      @map("description_en")
+  startMonth    Int          @default(0) @map("start_month")
+  endMonth      Int          @default(11) @map("end_month")
   committee     Committee?   @relation(fields: [committeeId], references: [id], onDelete: NoAction, onUpdate: NoAction, map: "positions_committee_id_foreign")
   emailAliases  EmailAlias[]
   mandates      Mandate[]

src/database/seed/.snaplet/dataModel.json

@@ -7668,6 +7668,34 @@
           "isId": false,
           "maxLength": null
         },
+        {
+          "id": "public.positions.end_month",
+          "name": "end_month",
+          "columnName": "end_month",
+          "type": "int4",
+          "isRequired": true,
+          "kind": "scalar",
+          "isList": false,
+          "isGenerated": false,
+          "sequence": false,
+          "hasDefaultValue": true,
+          "isId": false,
+          "maxLength": null
+        },
+        {
+          "id": "public.positions.start_month",
+          "name": "start_month",
+          "columnName": "start_month",
+          "type": "int4",
+          "isRequired": true,
+          "kind": "scalar",
+          "isList": false,
+          "isGenerated": false,
+          "sequence": false,
+          "hasDefaultValue": true,
+          "isId": false,
+          "maxLength": null
+        },
         {
           "name": "committees",
           "type": "committees",

src/routes/(app)/positions/[id]/+page.server.ts

@@ -12,6 +12,10 @@ import authentik from "$lib/server/authentik";
 import type { Actions, PageServerLoad } from "./$types";
 import * as m from "$paraglide/messages";
 import { languageTag } from "$paraglide/runtime";
+import dayjs from "dayjs";
+import utc from "dayjs/plugin/utc";
+
+dayjs.extend(utc);
 
 export const load: PageServerLoad = async ({ locals, params }) => {
   const { prisma } = locals;
@@ -48,9 +52,40 @@ export const load: PageServerLoad = async ({ locals, params }) => {
   if (!position) {
     throw error(404, m.positions_errors_positionNotFound());
   }
+
+  //Logic for startMonth and endMonth that can wrap over new years
+
+  //If the mandateperiod is within a year the endMonth will be greater than the startMonth which gives the difference:
+  //(position.endMonth - position.startMonth) to be added.
+
+  //If the mandateperiod wraps into a new year (and is a year or less) the endMonth will be smaller than the startMonth.
+  //The months that need to be added in this case is a full year minus the difference between the months:
+  //12 - Math.abs(position.endMonth - position.startMonth)
+
+  const addMandateMonthDifference =
+    position.endMonth > position.startMonth
+      ? position.endMonth - position.startMonth
+      : 12 - Math.abs(position.endMonth - position.startMonth);
+
   return {
     updateForm: superValidate(position, zod(updateSchema)),
-    addMandateForm: superValidate(zod(addManadateSchema)),
+    addMandateForm: superValidate(zod(addManadateSchema), {
+      defaults: {
+        memberId: "",
+        startDate: dayjs()
+          .month(position.startMonth)
+          .utc()
+          .startOf("month")
+          .toDate(),
+        endDate: dayjs()
+          .month(position.startMonth)
+          .utc()
+          .startOf("month")
+          .add(addMandateMonthDifference, "months")
+          .endOf("month")
+          .toDate(),
+      },
+    }),
     updateMandateForm: superValidate(zod(updateMandateSchema)),
     deleteMandateForm: superValidate(zod(deleteMandateSchema)),
     position,