From 4b2f6371a360d1089d22fade19e7ca7a93812aa0 Mon Sep 17 00:00:00 2001
From: Carlo <carlo.panzi@gmail.com>
Date: Sun, 21 Nov 2021 18:36:30 +0100
Subject: [PATCH] feat: accounts are returned sorted by usage

---
 backend/config/index.ts                |  3 ++-
 backend/helpers/get-accounts-sorted.ts | 21 +++++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 backend/helpers/get-accounts-sorted.ts

diff --git a/backend/config/index.ts b/backend/config/index.ts
index 377ac2a..1e565cd 100644
--- a/backend/config/index.ts
+++ b/backend/config/index.ts
@@ -1,4 +1,5 @@
 import { filename, readFile } from '../dal';
+import getAccountsSorted from '../helpers/get-accounts-sorted';
 
 export default function (fastify, opts, done) {
   const routes = [
@@ -9,7 +10,7 @@ export default function (fastify, opts, done) {
         const data = await readFile();
         return {
           file: filename,
-          accounts: data.accounts,
+          accounts: getAccountsSorted(data.transactions),
           commodities: data.commodities,
         };
       },
diff --git a/backend/helpers/get-accounts-sorted.ts b/backend/helpers/get-accounts-sorted.ts
new file mode 100644
index 0000000..d5de5cd
--- /dev/null
+++ b/backend/helpers/get-accounts-sorted.ts
@@ -0,0 +1,21 @@
+import { Transaction } from 'pta-journal';
+
+type Temp = { k: string; n: number };
+
+function getAccountsSorted(trxs: Transaction[]): string[] {
+  const obj = trxs
+    .flatMap((trx) => trx.entries.map((entry) => entry.account))
+    .reduce((acc, cur) => {
+      acc[cur] = (acc[cur] || 0) + 1;
+      return acc;
+    }, {} as Record<string, number>);
+
+  let a: Temp[] = [];
+  for (let k in obj) {
+    a.push({ k: k, n: obj[k] });
+  }
+
+  return a.sort((a, b) => b.n - a.n).map((a) => a.k);
+}
+
+export default getAccountsSorted;