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import { Song } from "../types/song";
const SALT = import.meta.env.VITE_HEARDLE_SALT ?? 'changeme';
const API_URL = import.meta.env.VITE_HEARDLE_API_URL ?? 'http://localhost:3001';
function hexToBytes(hex: string): Uint8Array {
const bytes = new Uint8Array(hex.length / 2);
for (let i = 0; i < hex.length; i += 2) {
bytes[i / 2] = parseInt(hex.slice(i, i + 2), 16);
}
return bytes;
}
function xor(data: Uint8Array, key: Uint8Array): Uint8Array {
const output = new Uint8Array(data.length);
for (let i = 0; i < data.length; i++) {
output[i] = data[i] ^ key[i % key.length];
}
return output;
}
function getObfuscationKey(): Uint8Array {
const date = new Date().toISOString().split('T')[0];
return new TextEncoder().encode(SALT + date);
}
export async function getDailySolution(): Promise<Song> {
const solutionData = await fetch(`${API_URL}/today`);
if (!solutionData.ok) {
throw new Error(`Failed to fetch solution: ${solutionData.statusText}`);
}
const { data } = await solutionData.json();
const obfuscationKey = getObfuscationKey();
const obfuscatedBytes = hexToBytes(data);
const decrypted = xor(obfuscatedBytes, obfuscationKey);
return JSON.parse(new TextDecoder().decode(decrypted)) as Song;
}
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