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feat: simplify topup to VND-only, add bid/ask spread to convert

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Topup now only accepts VND — users must convert to get other currencies.
Convert uses a 0.5% bid/ask spread: buying USD costs more VND (ask),
selling USD back gives less VND (bid). Simulates real forex behavior.
This commit is contained in:
tiennm99
2026-04-14 16:06:36 +07:00
parent c8ce28a15b
commit f3aaf16d6a
4 changed files with 70 additions and 48 deletions
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52
tests/modules/trading/handlers.test.js
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@@ -68,22 +68,19 @@ describe("trading/handlers", () => {
describe("handleTopup", () => {
it("tops up VND", async () => {
const ctx = makeCtx("5000000 VND");
const ctx = makeCtx("5000000");
await handleTopup(ctx, db);
expect(ctx.reply).toHaveBeenCalledOnce();
expect(ctx.replies[0]).toContain("5.000.000 VND");
});
it("tops up USD and tracks VND equivalent in totalvnd", async () => {
const ctx = makeCtx("100 USD");
await handleTopup(ctx, db);
expect(ctx.replies[0]).toContain("$100.00");
});
it("defaults to VND when currency omitted", async () => {
it("tracks totalvnd", async () => {
const ctx = makeCtx("1000000");
await handleTopup(ctx, db);
expect(ctx.replies[0]).toContain("VND");
const { getPortfolio } = await import("../../../src/modules/trading/portfolio.js");
const p = await getPortfolio(db, 42);
expect(p.totalvnd).toBe(1000000);
expect(p.currency.VND).toBe(1000000);
});
it("rejects missing args", async () => {
@@ -93,16 +90,10 @@ describe("trading/handlers", () => {
});
it("rejects negative amount", async () => {
const ctx = makeCtx("-100 VND");
const ctx = makeCtx("-100");
await handleTopup(ctx, db);
expect(ctx.replies[0]).toContain("positive");
});
it("rejects unsupported currency", async () => {
const ctx = makeCtx("100 EUR");
await handleTopup(ctx, db);
expect(ctx.replies[0]).toContain("Unsupported");
});
});
describe("handleBuy", () => {
@@ -166,8 +157,10 @@ describe("trading/handlers", () => {
});
describe("handleConvert", () => {
it("converts USD to VND", async () => {
const { emptyPortfolio } = await import("../../../src/modules/trading/portfolio.js");
it("converts USD to VND at bid rate (less than mid)", async () => {
const { emptyPortfolio, getPortfolio } = await import(
"../../../src/modules/trading/portfolio.js"
);
const p = emptyPortfolio();
p.currency.USD = 100;
await savePortfolio(db, 42, p);
@@ -175,7 +168,28 @@ describe("trading/handlers", () => {
const ctx = makeCtx("50 USD VND");
await handleConvert(ctx, db);
expect(ctx.replies[0]).toContain("Converted");
expect(ctx.replies[0]).toContain("VND");
// bid rate = 25400 * 0.995 = 25273 VND/USD → 50 * 25273 = 1,263,650
const loaded = await getPortfolio(db, 42);
expect(loaded.currency.VND).toBeLessThan(50 * 25400); // less than mid rate
expect(loaded.currency.VND).toBeGreaterThan(0);
expect(ctx.replies[0]).toContain("spread");
});
it("converts VND to USD at ask rate (costs more VND)", async () => {
const { emptyPortfolio, getPortfolio } = await import(
"../../../src/modules/trading/portfolio.js"
);
const p = emptyPortfolio();
p.currency.VND = 30000000;
await savePortfolio(db, 42, p);
const ctx = makeCtx("1000000 VND USD");
await handleConvert(ctx, db);
expect(ctx.replies[0]).toContain("Converted");
// ask rate = 25400 * 1.005 = 25527 VND/USD → 1M / 25527 ≈ 39.17 USD
const loaded = await getPortfolio(db, 42);
expect(loaded.currency.USD).toBeLessThan(1000000 / 25400); // less USD than mid
expect(loaded.currency.USD).toBeGreaterThan(0);
});
it("rejects same currency conversion", async () => {