format amount so it is align to fractional digitls

1 files changed, 87 insertions, 7 deletions

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>
   );
 }