From 8b830be2835186ce8a348c6eb469ba614852f31e Mon Sep 17 00:00:00 2001
From: Carlo <carlo.panzi@gmail.com>
Date: Mon, 8 Nov 2021 15:07:00 +0100
Subject: [PATCH] feat: amounts and commodities auto suggestion

---
 frontend/src/pages/dashboard/entry-row.tsx | 17 ++++++--
 frontend/src/pages/dashboard/index.tsx     | 46 +++++++++++++++++-----
 2 files changed, 51 insertions(+), 12 deletions(-)

diff --git a/frontend/src/pages/dashboard/entry-row.tsx b/frontend/src/pages/dashboard/entry-row.tsx
index 9d23aa6..f6ee852 100644
--- a/frontend/src/pages/dashboard/entry-row.tsx
+++ b/frontend/src/pages/dashboard/entry-row.tsx
@@ -21,12 +21,23 @@ const useStyles = createStyles((theme) => {
 
 const EntryRow: FC<{
   accounts: string[];
+  amountPlaceholder: string | null;
   canDelete: boolean;
   commodities: string[];
   entry: TransactionEntry;
+  suggestedCommodity: string | undefined;
   removeRow: () => void;
   updateRow: (field: string, value: string) => void;
-}> = ({ accounts, canDelete, commodities, entry, removeRow, updateRow }) => {
+}> = ({
+  accounts,
+  amountPlaceholder,
+  canDelete,
+  commodities,
+  entry,
+  suggestedCommodity,
+  removeRow,
+  updateRow,
+}) => {
   const { classes } = useStyles();
   return (
     <Group className={classes.wrapper}>
@@ -41,13 +52,13 @@ const EntryRow: FC<{
         onChange={(value) => updateRow("account", value)}
       />
       <TextInput
-        placeholder="Amount"
+        placeholder={amountPlaceholder || "Amount"}
         value={entry.amount}
         style={{ flex: 2 }}
         onChange={(event) => updateRow("amount", event.currentTarget.value)}
       />
       <Autocomplete
-        placeholder="Commodity"
+        placeholder={suggestedCommodity || "Commodity"}
         value={entry.commodity}
         style={{ flex: 1 }}
         onChange={(value) => updateRow("commodity", value)}
diff --git a/frontend/src/pages/dashboard/index.tsx b/frontend/src/pages/dashboard/index.tsx
index 2846ae1..0ee6e2d 100644
--- a/frontend/src/pages/dashboard/index.tsx
+++ b/frontend/src/pages/dashboard/index.tsx
@@ -7,24 +7,34 @@ import { DatePicker } from '@mantine/dates';
 import { useForm } from '@mantine/hooks';
 import { useNotifications } from '@mantine/notifications';
 
-import { Transaction } from 'pta-journal';
+import { Transaction, TransactionEntry } from 'pta-journal';
 import { Api } from 'types';
 
 import ConfirmationModal from './confirmation-modal';
 import EntryRow from './entry-row';
 
-const EMPTY_ENTRY = { account: "", amount: "", commodity: "" };
+const EMPTY_ENTRY: TransactionEntry = {
+  account: "",
+  amount: "",
+};
+
+function allValuesAreEqual<T>(values: T[]): T | undefined {
+  if (values.every((value) => value == null || value === values[0])) {
+    return values[0];
+  }
+}
 
 const Dashboard: FC<{ journal: Api.BootstrapResponse }> = ({ journal }) => {
   const notifications = useNotifications();
 
-  const { onSubmit, values, setFieldValue, setValues, reset } = useForm({
-    initialValues: {
-      date: new Date(),
-      description: "",
-      entries: [EMPTY_ENTRY, EMPTY_ENTRY],
-    },
-  });
+  const { onSubmit, values, setFieldValue, setValues, reset } =
+    useForm<Transaction>({
+      initialValues: {
+        date: new Date(),
+        description: "",
+        entries: [EMPTY_ENTRY, EMPTY_ENTRY],
+      },
+    });
 
   const [modalOpen, setModalOpen] = useState(false);
   const [showOverlay, setOverlay] = useState(false);
@@ -88,6 +98,22 @@ const Dashboard: FC<{ journal: Api.BootstrapResponse }> = ({ journal }) => {
     });
   }
 
+  const outBalance = values.entries.reduce(
+    (acc, e) => acc + Number(e.amount),
+    0
+  );
+
+  const amountPlaceholder =
+    !isNaN(outBalance) && outBalance !== 0
+      ? (outBalance * -1).toString()
+      : null;
+
+  const singleCommodity = allValuesAreEqual(
+    values.entries.map((e) => e.commodity)
+  );
+
+  console.log("suggestedCommodity", singleCommodity);
+
   return (
     <div>
       <Paper padding="md" shadow="sm" component="section">
@@ -121,6 +147,8 @@ const Dashboard: FC<{ journal: Api.BootstrapResponse }> = ({ journal }) => {
               key={i}
               removeRow={removeRow(i)}
               updateRow={updateRow(i)}
+              amountPlaceholder={amountPlaceholder}
+              suggestedCommodity={singleCommodity}
             />
           ))}
           <Group position="right" style={{ marginTop: "25px" }}>