import { Server } from "@/lib/api";

/*
 * The browser's copy of services.ResolveTargets.
 *
 * This is a deliberate duplication: the authority is UnionTargets/MatchesTags in
 * server/internal/services/targets.go, and this exists only so a screen can
 * answer "how many servers?" without a round trip, since the browser already
 * holds the fleet. It must stay identical in MEANING to the Go version and
 * change in the same commit as it.
 *
 * It lives here rather than in a component because it had already been written
 * twice — once in the designer and once, wrongly, on the workflows list, where
 * the count ignored tags entirely and a tag-only workflow reported zero targets.
 */

/** True when srv carries every pair in sel. Tag keys AND together. */
export function matchesTags(srv: Server, sel: Record<string, string>): boolean {
    // An EMPTY selector matches NOTHING, not everything. The alternative turns a
    // cleared field in the editor into a fleet-wide run.
    if (Object.keys(sel).length === 0) return false;
    return Object.entries(sel).every(([k, v]) => srv.tags?.[k] === v);
}

/** The distinct union of the named servers and the tag matches, in fleet order. */
export function resolveTargets(servers: Server[], ids: string[], sel: Record<string, string>): Server[] {
    return servers.filter((s) => ids.includes(s.server_id) || matchesTags(s, sel));
}