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[#159] Add balance display, validation, and MAX button to Trade/Donate #164

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Merged
realproject7 merged 2 commits into from
Mar 16, 2026
Merged

[#159] Add balance display, validation, and MAX button to Trade/Donate #164

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c5d107c
[#159] Add balance display, validation, and MAX button to Trade/Donate
realproject7 Mar 16, 2026
7e8f55c
[#159] Hide MAX button on Buy tab — unit mismatch fix
realproject7 Mar 16, 2026
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67 changes: 53 additions & 14 deletions src/components/DonateWidget.tsx
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@

import { useState, useCallback } from "react";
import { useAccount, useWriteContract } from "wagmi";
import { useQuery } from "@tanstack/react-query";
import { parseUnits, formatUnits } from "viem";
import { publicClient } from "../../lib/rpc";
import { erc20Abi } from "../../lib/price";
Expand Down Expand Up @@ -29,6 +30,24 @@ export function DonateWidget({ storylineId }: DonateWidgetProps) {
? parseUnits(amount, 18)
: BigInt(0);

// Fetch reserve token balance
const { data: balance, refetch: refetchBalance } = useQuery({
queryKey: ["token-balance", PLOT_TOKEN, address],
queryFn: async () => {
return publicClient.readContract({
address: PLOT_TOKEN,
abi: erc20Abi,
functionName: "balanceOf",
args: [address!],
});
},
enabled: !!address,
refetchInterval: 15000,
});

const insufficientBalance =
balance !== undefined && parsedAmount > BigInt(0) && parsedAmount > balance;

const executeDonate = useCallback(async () => {
if (!address || parsedAmount === BigInt(0)) return;

Expand Down Expand Up @@ -82,11 +101,12 @@ export function DonateWidget({ storylineId }: DonateWidgetProps) {

setTxState("done");
setAmount("");
refetchBalance();
} catch (err) {
setError(err instanceof Error ? err.message : "Transaction failed");
setTxState("error");
}
}, [address, parsedAmount, storylineId, writeContractAsync]);
}, [address, parsedAmount, storylineId, writeContractAsync, refetchBalance]);

const reset = useCallback(() => {
setTxState("idle");
Expand All @@ -107,18 +127,37 @@ export function DonateWidget({ storylineId }: DonateWidgetProps) {
<label className="text-muted block text-[10px] uppercase tracking-wider">
Amount ({reserveLabel})
</label>
<input
type="text"
inputMode="decimal"
placeholder="0.0"
value={amount}
onChange={(e) => {
setAmount(e.target.value);
if (txState !== "idle") reset();
}}
disabled={txState !== "idle" && txState !== "error" && txState !== "done"}
className="border-border bg-background text-foreground mt-1 w-full rounded border px-3 py-2 text-sm focus:border-accent focus:outline-none disabled:opacity-50"
/>
<div className="relative mt-1">
<input
type="text"
inputMode="decimal"
placeholder="0.0"
value={amount}
onChange={(e) => {
setAmount(e.target.value);
if (txState !== "idle") reset();
}}
disabled={txState !== "idle" && txState !== "error" && txState !== "done"}
className="border-border bg-background text-foreground w-full rounded border px-3 py-2 pr-14 text-sm focus:border-accent focus:outline-none disabled:opacity-50"
/>
{balance !== undefined && (
<button
type="button"
onClick={() => setAmount(formatUnits(balance, 18))}
className="text-accent hover:text-foreground absolute right-2 top-1/2 -translate-y-1/2 text-[10px] font-bold"
>
MAX
</button>
)}
</div>
{balance !== undefined && (
<p className="text-muted mt-1 text-[10px]">
Balance: {formatUnits(balance, 18)} {reserveLabel}
</p>
)}
{insufficientBalance && (
<p className="mt-1 text-[10px] text-red-400">Insufficient balance</p>
)}
</div>

{parsedAmount > BigInt(0) && (
Expand All @@ -134,7 +173,7 @@ export function DonateWidget({ storylineId }: DonateWidgetProps) {
<button
onClick={txState === "done" || txState === "error" ? reset : executeDonate}
disabled={
(txState === "idle" && parsedAmount === BigInt(0)) ||
(txState === "idle" && (parsedAmount === BigInt(0) || insufficientBalance)) ||
(txState !== "idle" && txState !== "done" && txState !== "error")
}
className="bg-accent text-background mt-3 w-full rounded py-2 text-xs font-medium transition-opacity disabled:opacity-40"
Expand Down
72 changes: 58 additions & 14 deletions src/components/TradingWidget.tsx
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,22 @@ export function TradingWidget({ tokenAddress }: { tokenAddress: Address }) {
? parseUnits(amount, 18)
: BigInt(0);

// Fetch relevant balance: reserve token for buy, storyline token for sell
const balanceToken = tab === "buy" ? PLOT_TOKEN : tokenAddress;
const { data: balance, refetch: refetchBalance } = useQuery({
queryKey: ["token-balance", balanceToken, address],
queryFn: async () => {
return publicClient.readContract({
address: balanceToken,
abi: erc20Abi,
functionName: "balanceOf",
args: [address!],
});
},
enabled: !!address,
refetchInterval: 15000,
});

// Fetch price estimate
const { data: estimate } = useQuery({
queryKey: ["trade-estimate", tab, tokenAddress, amount],
Expand Down Expand Up @@ -135,18 +151,27 @@ export function TradingWidget({ tokenAddress }: { tokenAddress: Address }) {

setTxState("done");
setAmount("");
refetchBalance();
} catch (err) {
setError(err instanceof Error ? err.message : "Transaction failed");
setTxState("error");
}
}, [address, parsedAmount, estimate, tab, tokenAddress, writeContractAsync]);
}, [address, parsedAmount, estimate, tab, tokenAddress, writeContractAsync, refetchBalance]);

const reset = useCallback(() => {
setTxState("idle");
setError(null);
setTxHash(null);
}, []);

// Pre-validate balance
const insufficientBalance =
balance !== undefined &&
parsedAmount > BigInt(0) &&
(tab === "buy"
? estimate != null && applySlippage(estimate, true) > balance
: parsedAmount > balance);

if (!isConnected) return null;

return (
Expand Down Expand Up @@ -179,18 +204,37 @@ export function TradingWidget({ tokenAddress }: { tokenAddress: Address }) {
<label className="text-muted block text-[10px] uppercase tracking-wider">
{tab === "buy" ? "Tokens to buy" : "Tokens to sell"}
</label>
<input
type="text"
inputMode="decimal"
placeholder="0.0"
value={amount}
onChange={(e) => {
setAmount(e.target.value);
if (txState !== "idle") reset();
}}
disabled={txState !== "idle" && txState !== "error" && txState !== "done"}
className="border-border bg-background text-foreground mt-1 w-full rounded border px-3 py-2 text-sm focus:border-accent focus:outline-none disabled:opacity-50"
/>
<div className="relative mt-1">
<input
type="text"
inputMode="decimal"
placeholder="0.0"
value={amount}
onChange={(e) => {
setAmount(e.target.value);
if (txState !== "idle") reset();
}}
disabled={txState !== "idle" && txState !== "error" && txState !== "done"}
className={`border-border bg-background text-foreground w-full rounded border px-3 py-2 text-sm focus:border-accent focus:outline-none disabled:opacity-50 ${tab === "sell" ? "pr-14" : ""}`}
/>
{tab === "sell" && balance !== undefined && (
<button
type="button"
onClick={() => setAmount(formatUnits(balance, 18))}
className="text-accent hover:text-foreground absolute right-2 top-1/2 -translate-y-1/2 text-[10px] font-bold"
>
MAX
</button>
)}
</div>
{balance !== undefined && (
<p className="text-muted mt-1 text-[10px]">
Balance: {formatUnits(balance, 18)} {tab === "buy" ? reserveLabel : "tokens"}
</p>
)}
{insufficientBalance && (
<p className="mt-1 text-[10px] text-red-400">Insufficient balance</p>
)}
</div>

{/* Estimate */}
Expand All @@ -208,7 +252,7 @@ export function TradingWidget({ tokenAddress }: { tokenAddress: Address }) {
<button
onClick={txState === "done" || txState === "error" ? reset : executeTrade}
disabled={
(txState === "idle" && (parsedAmount === BigInt(0) || !estimate)) ||
(txState === "idle" && (parsedAmount === BigInt(0) || !estimate || insufficientBalance)) ||
(txState !== "idle" && txState !== "done" && txState !== "error")
}
className="bg-accent text-background mt-3 w-full rounded py-2 text-xs font-medium transition-opacity disabled:opacity-40"
Expand Down
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