import { api } from './client';
import type { FlightParameters, RawPrediction } from '$domain';

/**
 * GFS datasets are published every 6 hours with a ~6 hour processing lag.
 * Round down to the most recent available slot.
 */
export function getLatestDataset(now: Date = new Date()): string {
	// const rounded = new Date(now);
	// rounded.setUTCHours(Math.floor(rounded.getUTCHours() / 6) * 6, 0, 0, 0);
	// rounded.setUTCHours(rounded.getUTCHours() - 6);
	// return rounded.toISOString();
	return "2025-04-06T00:00:00Z";
}

export function buildLaunchDateTime(date: string, time: string): string {
	const fullTime = time.split(':').length === 2 ? `${time}:00` : time;
	return new Date(`${date}T${fullTime}Z`).toISOString();
}

export interface PredictionResponse {
	result: RawPrediction;
}

export const predictionsApi = {
	run: (params: FlightParameters, launchDateTime: string) => {
		const payload: FlightParameters & { launch_datetime: string } = {
			...params,
			dataset: params.dataset || getLatestDataset(),
			launch_datetime: launchDateTime,
		};
		if (payload.start_point === -1) delete payload.start_point;
		return api.post<PredictionResponse>('/predictions/', payload);
	},
};