import type { BackendMetricsRow } from "./backend-metrics-client";

export type BackendMetricsSearchRequestMessage = {
  type: "backend-metrics:search";
  value: {
    starIds: string[];
  };
};

export type BackendMetricsResponseMessage =
  | {
      ok: true;
      type: "backend-metrics:result";
      value: {
        rows: BackendMetricsRow[];
      };
    }
  | {
      error: string;
      ok: false;
      type: "backend-metrics:error";
    };

export function isBackendMetricsSearchRequestMessage(
  value: unknown
): value is BackendMetricsSearchRequestMessage {
  if (!value || typeof value !== "object") {
    return false;
  }

  const candidate = value as Partial<BackendMetricsSearchRequestMessage>;
  return (
    candidate.type === "backend-metrics:search" &&
    Boolean(
      candidate.value &&
        typeof candidate.value === "object" &&
        Array.isArray((candidate.value as { starIds?: unknown }).starIds) &&
        (candidate.value as { starIds: unknown[] }).starIds.every(
          (starId) => typeof starId === "string"
        )
    )
  );
}

export function isBackendMetricsResponseMessage(
  value: unknown
): value is BackendMetricsResponseMessage {
  if (!value || typeof value !== "object") {
    return false;
  }

  const candidate = value as Partial<BackendMetricsResponseMessage>;
  if (candidate.ok === false) {
    return (
      candidate.type === "backend-metrics:error" &&
      typeof candidate.error === "string"
    );
  }

  return Boolean(
    candidate.ok === true &&
      candidate.type === "backend-metrics:result" &&
      candidate.value &&
      typeof candidate.value === "object" &&
      Array.isArray((candidate.value as { rows?: unknown }).rows)
  );
}