import type { HttpSearchInit } from './types';

export function normalizeSearch(input: HttpSearchInit | undefined): URLSearchParams | undefined {
	if (input === undefined) return undefined;

	if (input instanceof URLSearchParams) return new URLSearchParams(input);

	if (typeof input === 'string') {
		return new URLSearchParams(input.startsWith('?') ? input.slice(1) : input);
	}

	const out = new URLSearchParams();

	if (Array.isArray(input)) {
		for (const [key, value] of input) out.append(key, String(value));
		return out;
	}

	for (const [key, value] of Object.entries(input)) {
		if (value === null || value === undefined) continue;
		out.append(key, String(value));
	}
	return out;
}

export function appendSearch(url: string, params: URLSearchParams | undefined): string {
	if (params === undefined || params.size === 0) return url;
	const separator = url.includes('?') ? '&' : '?';
	return `${url}${separator}${params.toString()}`;
}

export function resolveUrl(url: string, baseUrl: string | undefined): string {
	if (baseUrl === undefined || baseUrl === '') return url;
	if (/^[a-zA-Z][a-zA-Z\d+\-.]*:/.test(url)) return url;

	const trimmedBase = baseUrl.split('?')[0].split('#')[0].replace(/\/+$/, '');
	const trimmedUrl = url.replace(/^\/+/, '');
	return `${trimmedBase}/${trimmedUrl}`;
}