// Copyright (c) Mysten Labs, Inc.
// SPDX-License-Identifier: Apache-2.0

import { useTimeAgo } from '@mysten/core';
import { useSuiClientQuery } from '@mysten/dapp-kit';

export function useEpochProgress(suffix: string = 'left') {
	const { data } = useSuiClientQuery('getLatestSuiSystemState');
	const start = data?.epochStartTimestampMs ? Number(data.epochStartTimestampMs) : undefined;
	const duration = data?.epochDurationMs ? Number(data.epochDurationMs) : undefined;
	const end = start !== undefined && duration !== undefined ? start + duration : undefined;
	const time = useTimeAgo({
		timeFrom: end || null,
		shortedTimeLabel: true,
		shouldEnd: true,
	});

	if (!start || !end) {
		return {};
	}

	const progress =
		start && duration ? Math.min(((Date.now() - start) / (end - start)) * 100, 100) : 0;

	const timeLeftMs = Date.now() - end;
	const timeLeftMin = Math.floor(timeLeftMs / 60000);

	let label;
	if (timeLeftMs >= 0) {
		label = 'Ending soon';
	} else if (timeLeftMin >= -1) {
		label = 'About a min left';
	} else {
		label = `${time} ${suffix}`;
	}

	return {
		epoch: data?.epoch,
		progress,
		label,
		end,
		start,
	};
}

export function getElapsedTime(start: number, end: number) {
	const diff = end - start;

	const seconds = Math.floor(diff / 1000);
	const minutes = Math.floor(seconds / 60);
	const hours = Math.floor(minutes / 60);

	const displayMinutes = minutes - hours * 60;
	const displaySeconds = seconds - minutes * 60;

	const renderTime = [];

	if (hours > 0) {
		renderTime.push(`${hours}h`);
	}
	if (displayMinutes > 0) {
		renderTime.push(`${displayMinutes}m`);
	}
	if (displaySeconds > 0) {
		renderTime.push(`${displaySeconds}s`);
	}

	return renderTime.join(' ');
}