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import type { PluginNode } from "./types";
/**
* Whether unloading `targetId` would remove the LAST loaded provider — the
* §8 hard lock (the one unload the server refuses outright, never force-able).
* The UI disables the control with an explanatory tooltip; the server still
* enforces the rule. Pure input → output.
*/
export function isLastProvider(targetId: string, nodes: readonly PluginNode[]): boolean {
const target = nodes.find((n) => n.id === targetId);
if (target === undefined || !target.loaded || target.tier !== "providers") return false;
const loadedProviders = nodes.filter((n) => n.loaded && n.tier === "providers");
return loadedProviders.length <= 1;
}
/**
* Why the row's load/unload control is disabled, or null when it is
* interactive. Composes the two client-mirrored locks:
* - tier "core" (`locked`) → the server refuses to unload it (§3/§5);
* - the last loaded provider → the §8 hard lock.
* Missing rows have no control at all (handled separately by the UI).
*/
export function unloadBlockReason(targetId: string, nodes: readonly PluginNode[]): string | null {
const target = nodes.find((n) => n.id === targetId);
if (target === undefined) return null;
if (target.locked) return "Core plugins cannot be unloaded — they are part of the runtime.";
if (isLastProvider(targetId, nodes)) {
return "Cannot unload the last provider — Dispatch needs at least one to pick models.";
}
return null;
}
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