const IN_PER_M = 3.00;
const OUT_PER_M = 15.00;
const CACHE_READ_PER_M = 0.30;
const CACHE_WRITE_PER_M = 3.75;

export function estimateCost({ tokens_input = 0, tokens_output = 0, cache_read = 0, cache_write = 0 }) {
    const usd =
        (tokens_input / 1_000_000) * IN_PER_M +
        (tokens_output / 1_000_000) * OUT_PER_M +
        (cache_read / 1_000_000) * CACHE_READ_PER_M +
        (cache_write / 1_000_000) * CACHE_WRITE_PER_M;
    return usd;
}

export function fmtUsd(usd) {
    if (usd < 0.01) return `$${usd.toFixed(4)}`;
    return `$${usd.toFixed(3)}`;
}

export function fmtTokens(n) {
    if (n >= 1000) return `${(n / 1000).toFixed(1)}K`;
    return String(n);
}