From 4b71413f7cbb9543d58f02efb453cd5462f2a3bf Mon Sep 17 00:00:00 2001
From: Kalle <38327916+Sendouc@users.noreply.github.com>
Date: Sun, 22 May 2022 00:06:44 +0300
Subject: [PATCH] Add lastCompletedVoting function

---
 app/core/plus.test.ts | 28 +++++++++++++++++++++++++
 app/core/plus.ts      | 49 +++++++++++++++++++++++++++++++++++++++++++
 package-lock.json     | 28 ++++++++++++++++++++++++-
 package.json          |  5 ++++-
 4 files changed, 108 insertions(+), 2 deletions(-)
 create mode 100644 app/core/plus.test.ts
 create mode 100644 app/core/plus.ts

diff --git a/app/core/plus.test.ts b/app/core/plus.test.ts
new file mode 100644
index 000000000..6e047f217
--- /dev/null
+++ b/app/core/plus.test.ts
@@ -0,0 +1,28 @@
+import { suite } from "uvu";
+import * as assert from "uvu/assert";
+import { lastCompletedVoting } from "./plus";
+
+const LastCompletedVoting = suite("lastCompletedVoting()");
+
+LastCompletedVoting("Previous month if voting yet to happen", () => {
+  assert.equal(lastCompletedVoting(new Date(Date.UTC(2022, 4, 1))), {
+    month: 3,
+    year: 2022,
+  });
+});
+
+LastCompletedVoting("Previous month if voting in progress", () => {
+  assert.equal(lastCompletedVoting(new Date(Date.UTC(2022, 4, 7))), {
+    month: 3,
+    year: 2022,
+  });
+});
+
+LastCompletedVoting("Same month if voting over", () => {
+  assert.equal(lastCompletedVoting(new Date(Date.UTC(2022, 4, 15))), {
+    month: 4,
+    year: 2022,
+  });
+});
+
+LastCompletedVoting.run();
diff --git a/app/core/plus.ts b/app/core/plus.ts
new file mode 100644
index 000000000..01e9e5dfd
--- /dev/null
+++ b/app/core/plus.ts
@@ -0,0 +1,49 @@
+interface MonthYear {
+  month: number;
+  year: number;
+}
+
+export function lastCompletedVoting(now: Date): MonthYear {
+  const thisMonthsRange = monthsVotingRange({
+    month: now.getMonth(),
+    year: now.getFullYear(),
+  });
+
+  if (thisMonthsRange.endDate.getTime() < now.getTime()) {
+    return {
+      month: thisMonthsRange.endDate.getMonth(),
+      year: thisMonthsRange.endDate.getFullYear(),
+    };
+  }
+
+  return previousMonth({
+    month: thisMonthsRange.endDate.getMonth(),
+    year: thisMonthsRange.endDate.getFullYear(),
+  });
+}
+
+/** Range of first Friday of a month to the following Monday (this range is when voting is active) */
+function monthsVotingRange({ month, year }: MonthYear) {
+  const startDate = new Date(Date.UTC(year, month, 1, 10));
+
+  while (startDate.getDay() !== 5) {
+    startDate.setDate(startDate.getDate() + 1);
+  }
+
+  const endDate = new Date(startDate.getTime());
+  endDate.setDate(endDate.getDate() + 3);
+
+  return { startDate, endDate };
+}
+
+function previousMonth(input: MonthYear): MonthYear {
+  let { month, year } = input;
+
+  month--;
+  if (month < 0) {
+    month = 11;
+    year--;
+  }
+
+  return { month, year };
+}
diff --git a/package-lock.json b/package-lock.json
index 821e5f8d4..48722eb2b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -44,7 +44,9 @@
         "stylelint-order": "^5.0.0",
         "ts-node": "^10.7.0",
         "tsconfig-paths": "^4.0.0",
-        "typescript": "^4.5.5"
+        "tsm": "^2.2.1",
+        "typescript": "^4.5.5",
+        "uvu": "^0.5.3"
       },
       "engines": {
         "node": ">=14"
@@ -13403,6 +13405,21 @@
       "integrity": "sha512-d6xOpEDfsi2CZVlPQzGeux8XMwLT9hssAsaPYExaQMuYskwb+x1x7J371tWlbBdWHroy99KnVB6qIkUbs5X3UQ==",
       "dev": true
     },
+    "node_modules/tsm": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/tsm/-/tsm-2.2.1.tgz",
+      "integrity": "sha512-qvJB0baPnxQJolZru11mRgGTdNlx17WqgJnle7eht3Vhb+VUR4/zFA5hFl6NqRe7m8BD9w/6yu0B2XciRrdoJA==",
+      "dev": true,
+      "dependencies": {
+        "esbuild": "^0.14.0"
+      },
+      "bin": {
+        "tsm": "bin.js"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/tsutils": {
       "version": "3.21.0",
       "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-3.21.0.tgz",
@@ -24231,6 +24248,15 @@
       "integrity": "sha512-d6xOpEDfsi2CZVlPQzGeux8XMwLT9hssAsaPYExaQMuYskwb+x1x7J371tWlbBdWHroy99KnVB6qIkUbs5X3UQ==",
       "dev": true
     },
+    "tsm": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/tsm/-/tsm-2.2.1.tgz",
+      "integrity": "sha512-qvJB0baPnxQJolZru11mRgGTdNlx17WqgJnle7eht3Vhb+VUR4/zFA5hFl6NqRe7m8BD9w/6yu0B2XciRrdoJA==",
+      "dev": true,
+      "requires": {
+        "esbuild": "^0.14.0"
+      }
+    },
     "tsutils": {
       "version": "3.21.0",
       "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-3.21.0.tgz",
diff --git a/package.json b/package.json
index 44a36237e..5303c32b3 100644
--- a/package.json
+++ b/package.json
@@ -16,6 +16,7 @@
     "prettier:check": "prettier --check .",
     "prettier:write": "prettier --write .",
     "typecheck": "tsc --noEmit",
+    "test:unit": "uvu -r tsm -r tsconfig-paths/register -i cypress",
     "cy:open": "cypress open",
     "checks": "npm run lint:styles && npm run lint:ts && npm run prettier:check && npm run typecheck"
   },
@@ -58,7 +59,9 @@
     "stylelint-order": "^5.0.0",
     "ts-node": "^10.7.0",
     "tsconfig-paths": "^4.0.0",
-    "typescript": "^4.5.5"
+    "tsm": "^2.2.1",
+    "typescript": "^4.5.5",
+    "uvu": "^0.5.3"
   },
   "engines": {
     "node": ">=14"