format amount so it is align to fractional digitls

4 files changed, 210 insertions, 11 deletions

diff --git a/packages/taler-wallet-webextension/src/components/Amount.stories.tsx b/packages/taler-wallet-webextension/src/components/Amount.stories.tsx
new file mode 100644
index 000000000..caf35d57e
--- /dev/null
+++ b/packages/taler-wallet-webextension/src/components/Amount.stories.tsx
@@ -0,0 +1,114 @@
+/*
+ This file is part of GNU Taler
+ (C) 2022 Taler Systems S.A.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ *
+ * @author Sebastian Javier Marchano (sebasjm)
+ */
+
+import { styled } from "@linaria/react";
+import { Fragment, h, VNode } from "preact";
+import { Amount } from "./Amount.js";
+
+export default {
+  title: "components/amount",
+  component: Amount,
+};
+
+const Table = styled.table`
+  td {
+    padding: 4px;
+  }
+  td {
+    border-bottom: 1px solid black;
+  }
+`;
+
+function ProductTable(
+  prods: string[],
+  AmountRender: (p: { value: string; index: number }) => VNode = Amount,
+): VNode {
+  return (
+    <Table>
+      <tr>
+        <td>product</td>
+        <td>price</td>
+      </tr>
+      {prods.map((value, i) => {
+        return (
+          <tr key={i}>
+            <td>p{i}</td>
+            <td>
+              <AmountRender value={value} index={i} />
+              {/* <Amount value={value} fracSize={fracSize} /> */}
+            </td>
+          </tr>
+        );
+      })}
+    </Table>
+  );
+}
+
+export const WithoutFixedSizeDefault = (): VNode =>
+  ProductTable(["ARS:19", "ARS:0.1", "ARS:10.02"]);
+
+export const WithFixedSizeZero = (): VNode =>
+  ProductTable(["ARS:19", "ARS:0.1", "ARS:10.02"], ({ value }) => {
+    return <Amount value={value} maxFracSize={0} />;
+  });
+
+export const WithFixedSizeFour = (): VNode =>
+  ProductTable(
+    ["ARS:19", "ARS:0.1", "ARS:10.02", "ARS:10.0123", "ARS:10.0123123"],
+    ({ value }) => {
+      return <Amount value={value} maxFracSize={4} />;
+    },
+  );
+
+export const WithFixedSizeFourNegative = (): VNode =>
+  ProductTable(
+    ["ARS:19", "ARS:0.1", "ARS:10.02", "ARS:10.0123", "ARS:10.0123123"],
+    ({ value, index }) => {
+      return (
+        <Amount value={value} maxFracSize={4} negative={index % 2 === 0} />
+      );
+    },
+  );
+
+export const WithFixedSizeFourOverflow = (): VNode =>
+  ProductTable(
+    ["ARS:19", "ARS:0.1", "ARS:10123123.02", "ARS:10.0123", "ARS:10.0123123"],
+    ({ value, index }) => {
+      return (
+        <Amount value={value} maxFracSize={4} negative={index % 2 === 0} />
+      );
+    },
+  );
+
+export const WithFixedSizeFourAccounting = (): VNode =>
+  ProductTable(
+    ["ARS:19", "ARS:0.1", "ARS:10123123.02", "ARS:10.0123", "ARS:10.0123123"],
+    ({ value, index }) => {
+      return (
+        <Amount
+          value={value}
+          signType="accounting"
+          maxFracSize={4}
+          negative={index % 2 === 0}
+        />
+      );
+    },
+  );
diff --git a/packages/taler-wallet-webextension/src/components/Amount.tsx b/packages/taler-wallet-webextension/src/components/Amount.tsx
index 8b97896bb..09f65473c 100644
--- a/packages/taler-wallet-webextension/src/components/Amount.tsx
+++ b/packages/taler-wallet-webextension/src/components/Amount.tsx
@@ -13,15 +13,95 @@
  You should have received a copy of the GNU General Public License along with
  GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
  */
-import { AmountJson, Amounts, AmountString } from "@gnu-taler/taler-util";
-import { h, VNode, Fragment } from "preact";
+import {
+  amountFractionalBase,
+  amountFractionalLength,
+  AmountJson,
+  Amounts,
+  AmountString,
+} from "@gnu-taler/taler-util";
+import { Fragment, h, VNode } from "preact";
 
-export function Amount({ value }: { value: AmountJson | AmountString }): VNode {
+export function Amount({
+  value,
+  maxFracSize,
+  negative,
+  hideCurrency,
+  signType = "standard",
+  signDisplay = "auto",
+}: {
+  negative?: boolean;
+  value: AmountJson | AmountString;
+  maxFracSize?: number;
+  hideCurrency?: boolean;
+  signType?: "accounting" | "standard";
+  signDisplay?: "auto" | "always" | "never" | "exceptZero";
+}): VNode {
   const aj = Amounts.jsonifyAmount(value);
-  const amount = Amounts.stringifyValue(aj, 2);
+  const minFractional =
+    maxFracSize !== undefined && maxFracSize < 2 ? maxFracSize : 2;
+  const af = aj.fraction % amountFractionalBase;
+  let s = "";
+  if ((af && maxFracSize) || minFractional > 0) {
+    s += ".";
+    let n = af;
+    for (
+      let i = 0;
+      (maxFracSize === undefined || i < maxFracSize) &&
+      i < amountFractionalLength;
+      i++
+    ) {
+      if (!n && i >= minFractional) {
+        break;
+      }
+      s = s + Math.floor((n / amountFractionalBase) * 10).toString();
+      n = (n * 10) % amountFractionalBase;
+    }
+  }
+  const fontSize = 18;
+  const letterSpacing = 0;
+  const mult = 0.7;
   return (
-    <Fragment>
-      {amount}&nbsp;{aj.currency}
-    </Fragment>
+    <span style={{ textAlign: "right", whiteSpace: "nowrap" }}>
+      <span
+        style={{
+          display: "inline-block",
+          fontFamily: "monospace",
+          fontSize,
+        }}
+      >
+        {negative ? (signType === "accounting" ? "(" : "-") : ""}
+        <span
+          style={{
+            display: "inline-block",
+            textAlign: "right",
+            fontFamily: "monospace",
+            fontSize,
+            letterSpacing,
+          }}
+        >
+          {aj.value}
+        </span>
+        <span
+          style={{
+            display: "inline-block",
+            width: !maxFracSize ? undefined : `${(maxFracSize + 1) * mult}em`,
+            textAlign: "left",
+            fontFamily: "monospace",
+            fontSize,
+            letterSpacing,
+          }}
+        >
+          {s}
+          {negative && signType === "accounting" ? ")" : ""}
+        </span>
+      </span>
+      {hideCurrency ? undefined : (
+        <Fragment>
+          &nbsp;
+          <span>{aj.currency}</span>
+        </Fragment>
+      )}
+    </span>
   );
 }
diff --git a/packages/taler-wallet-webextension/src/components/BankDetailsByPaytoType.tsx b/packages/taler-wallet-webextension/src/components/BankDetailsByPaytoType.tsx
index ef2a9f243..ec5d1e7aa 100644
--- a/packages/taler-wallet-webextension/src/components/BankDetailsByPaytoType.tsx
+++ b/packages/taler-wallet-webextension/src/components/BankDetailsByPaytoType.tsx
@@ -77,12 +77,16 @@ export function BankDetailsByPaytoType({
         <table>
           <tr>
             <td>{payto.targetPath}</td>
-            <td>{Amounts.stringifyValue(amount)} BTC</td>
+            <td>
+              <Amount value={amount} hideCurrency /> BTC
+            </td>
           </tr>
           {payto.segwitAddrs.map((addr, i) => (
             <tr key={i}>
               <td>{addr}</td>
-              <td>{Amounts.stringifyValue(min)} BTC</td>
+              <td>
+                <Amount value={min} hideCurrency /> BTC
+              </td>
             </tr>
           ))}
         </table>
diff --git a/packages/taler-wallet-webextension/src/components/index.stories.tsx b/packages/taler-wallet-webextension/src/components/index.stories.tsx
index b98606f6f..053b27f79 100644
--- a/packages/taler-wallet-webextension/src/components/index.stories.tsx
+++ b/packages/taler-wallet-webextension/src/components/index.stories.tsx
@@ -19,7 +19,8 @@
  * @author Sebastian Javier Marchano (sebasjm)
  */
 
-import * as a1 from "./Banner.stories.js";
+ import * as a1 from "./Banner.stories.js";
 import * as a2 from "./PendingTransactions.stories.js";
+import * as a3 from "./Amount.stories.js";
 
-export default [a1, a2];
+export default [a1, a2, a3];