import slugify from 'limax';

import { SITE, BLOG } from '~/config.mjs';

const trim = (str = '', ch?: string) => {
	let start = 0,
		end = str.length || 0;
	while (start < end && str[start] === ch) ++start;
	while (end > start && str[end - 1] === ch) --end;
	return start > 0 || end < str.length ? str.substring(start, end) : str;
};

const trimSlash = (s: string) => trim(trim(s, '/'));
const createPath = (...params: string[]) => {
	const paths = params.filter((el) => !!el).join('/');
	return '/' + paths + (SITE.trailingSlash && paths ? '/' : '');
};

const basePathname = trimSlash(SITE.basePathname);

export const cleanSlug = (text: string) =>
	trimSlash(text)
		.split('/')
		.map((slug) => slugify(slug))
		.join('/');

export const BLOG_BASE = cleanSlug(BLOG?.blog?.pathname);
export const POST_BASE = cleanSlug(BLOG?.post?.pathname);
export const CATEGORY_BASE = cleanSlug(BLOG?.category?.pathname);
export const TAG_BASE = cleanSlug(BLOG?.tag?.pathname);

/** */
export const getCanonical = (path = ''): string | URL => new URL(path, SITE.origin);

/** */
export const getPermalink = (slug = '', type = 'page'): string => {
	switch (type) {
		case 'category':
			return createPath(basePathname, CATEGORY_BASE, cleanSlug(slug));

		case 'tag':
			return createPath(basePathname, TAG_BASE, cleanSlug(slug));

		case 'post':
			return createPath(basePathname, POST_BASE, cleanSlug(slug));
	}

	return createPath(basePathname, trimSlash(slug));
};

/** */
export const getHomePermalink = (): string => {
	const permalink = getPermalink();
	return !permalink.startsWith('/') ? '/' + permalink : permalink;
};

/** */
export const getBlogPermalink = (): string => getPermalink(BLOG_BASE);