export type ImportRunLifecycle = {
  label: string;
  tone: "info" | "success" | "warning" | "inactive";
  canApply: boolean;
  canRollback: boolean;
  guidance: string;
};

export function importRunIdFromSearch(search: URLSearchParams): string {
  return search.get("import_run")?.trim() ?? "";
}

export function withImportRunSearch(search: URLSearchParams, runId?: string | null): URLSearchParams {
  const next = new URLSearchParams(search);
  const normalized = runId?.trim();
  if (normalized) next.set("import_run", normalized);
  else next.delete("import_run");
  return next;
}

export function importRunLifecycle(status: string): ImportRunLifecycle {
  if (status === "previewed") {
    return {
      label: "Ready for review",
      tone: "info",
      canApply: true,
      canRollback: false,
      guidance: "Review the persisted effects and diagnostics before applying this plan."
    };
  }
  if (status === "applied") {
    return {
      label: "Applied",
      tone: "success",
      canApply: false,
      canRollback: true,
      guidance: "The plan has already been applied. Rollback remains guarded by its recorded plan hash and contact evidence."
    };
  }
  if (status === "rolled_back") {
    return {
      label: "Rolled back",
      tone: "inactive",
      canApply: false,
      canRollback: false,
      guidance: "This run was rolled back and cannot be applied again. Create a new preview to import the source again."
    };
  }
  if (status === "expired") {
    return {
      label: "Expired",
      tone: "warning",
      canApply: false,
      canRollback: false,
      guidance: "This preview is no longer actionable. Create a new preview from the original source."
    };
  }
  return {
    label: status || "Unavailable",
    tone: "warning",
    canApply: false,
    canRollback: false,
    guidance: "This run is not actionable in its current lifecycle state."
  };
}

export function unavailableImportRunMessage(status?: number): string {
  if (status === 404 || status === 410) {
    return "This import run is missing, expired, or not available to your tenant. No source data was loaded.";
  }
  return "The persisted import run could not be loaded. Reload it after the service becomes available.";
}