import type { MeResponse, OrgMembership } from './api';

/** Alpha Silo host prefix: <slug>.educraft[.dev].… */
export function hostOrgSlug(hostname: string = typeof window !== 'undefined' ? window.location.hostname : ''): string | null {
	const host = hostname.toLowerCase();
	const m = host.match(/^([a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?)\.educraft(?:-dev)?\./);
	return m?.[1] ?? null;
}

export function isOrgAdmin(org: OrgMembership | null | undefined): boolean {
	if (!org) return false;
	const role = String(org.role ?? '').toUpperCase();
	return role === 'OWNER' || role === 'ADMIN';
}

/**
 * Resolve the tenancy for this browser session.
 * Prefers hostname slug (silo), then ?org=, then first admin membership, then first membership.
 */
export function resolveOrg(me: MeResponse | null | undefined, search: string = ''): OrgMembership | null {
	if (!me || me.organizations.length === 0) return null;
	const host = hostOrgSlug();
	if (host) {
		const byHost = me.organizations.find((o) => o.slug === host);
		if (byHost) return byHost;
	}
	const q = new URLSearchParams(search).get('org')?.trim();
	if (q) {
		const byQuery = me.organizations.find((o) => o.slug === q);
		if (byQuery) return byQuery;
	}
	const admin = me.organizations.find((o) => isOrgAdmin(o));
	return admin ?? me.organizations[0] ?? null;
}

/** SPA paths no longer embed org slug (subdomain carries tenancy). */
export function adminPath(rest: string = ''): string {
	const cleaned = rest.replace(/^\/+/, '');
	return cleaned === '' ? '/admin' : `/admin/${cleaned}`;
}