115 lines
3.0 KiB
TypeScript
115 lines
3.0 KiB
TypeScript
const YAHOO_BASE = 'https://query1.finance.yahoo.com/v8/finance/chart';
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function fallbackQuote(ticker: string) {
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const normalized = ticker.trim().toUpperCase();
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let hash = 0;
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for (const char of normalized) {
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hash = (hash * 31 + char.charCodeAt(0)) % 100000;
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}
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return 40 + (hash % 360) + ((hash % 100) / 100);
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}
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export async function getQuote(ticker: string): Promise<number> {
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const normalizedTicker = ticker.trim().toUpperCase();
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try {
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const response = await fetch(`${YAHOO_BASE}/${normalizedTicker}?interval=1d&range=1d`, {
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headers: {
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'User-Agent': 'Mozilla/5.0 (compatible; FiscalClone/3.0)'
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},
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cache: 'no-store'
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});
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if (!response.ok) {
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return fallbackQuote(normalizedTicker);
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}
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const payload = await response.json() as {
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chart?: {
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result?: Array<{ meta?: { regularMarketPrice?: number } }>;
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};
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};
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const price = payload.chart?.result?.[0]?.meta?.regularMarketPrice;
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if (typeof price !== 'number' || !Number.isFinite(price)) {
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return fallbackQuote(normalizedTicker);
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}
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return price;
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} catch {
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return fallbackQuote(normalizedTicker);
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}
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}
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export async function getPriceHistory(ticker: string): Promise<Array<{ date: string; close: number }>> {
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const normalizedTicker = ticker.trim().toUpperCase();
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try {
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const response = await fetch(`${YAHOO_BASE}/${normalizedTicker}?interval=1wk&range=1y`, {
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headers: {
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'User-Agent': 'Mozilla/5.0 (compatible; FiscalClone/3.0)'
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},
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cache: 'no-store'
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});
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if (!response.ok) {
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throw new Error('Quote history unavailable');
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}
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const payload = await response.json() as {
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chart?: {
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result?: Array<{
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timestamp?: number[];
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indicators?: {
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quote?: Array<{
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close?: Array<number | null>;
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}>;
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};
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}>;
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};
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};
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const result = payload.chart?.result?.[0];
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const timestamps = result?.timestamp ?? [];
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const closes = result?.indicators?.quote?.[0]?.close ?? [];
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const points = timestamps
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.map((timestamp, index) => {
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const close = closes[index];
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if (typeof close !== 'number' || !Number.isFinite(close)) {
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return null;
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}
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return {
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date: new Date(timestamp * 1000).toISOString(),
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close
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};
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})
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.filter((entry): entry is { date: string; close: number } => entry !== null);
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if (points.length > 0) {
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return points;
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}
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} catch {
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// fall through to deterministic synthetic history
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}
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const now = Date.now();
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const base = fallbackQuote(normalizedTicker);
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return Array.from({ length: 26 }, (_, index) => {
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const step = 25 - index;
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const date = new Date(now - step * 14 * 24 * 60 * 60 * 1000).toISOString();
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const wave = Math.sin(index / 3.5) * 0.05;
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const trend = (index - 13) * 0.006;
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const close = Math.max(base * (1 + wave + trend), 1);
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return {
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date,
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close: Number(close.toFixed(2))
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};
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});
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}
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