/**
 * Local cost calculation for Factory Droid usage.
 *
 * Mirrors pi-ai's `calculateCost` arithmetic exactly (same as the Command Code
 * backend). Factory is billed via subscription credits (multipliers), not
 * per-token USD, so the pricing table is all zeros — but the arithmetic must
 * still be correct if a host injects real per-token costs via onPayload.
 */

import type { ModelLike, Usage } from "./types.ts"

export function calculateFactoryDroidCost(model: ModelLike, usage: Usage): void {
	usage.cost.input = (model.cost.input / 1_000_000) * usage.input
	usage.cost.output = (model.cost.output / 1_000_000) * usage.output
	usage.cost.cacheRead = (model.cost.cacheRead / 1_000_000) * usage.cacheRead
	usage.cost.cacheWrite = (model.cost.cacheWrite * usage.cacheWrite) / 1_000_000
	usage.cost.total =
		usage.cost.input +
		usage.cost.output +
		usage.cost.cacheRead +
		usage.cost.cacheWrite
}