/**
 * Pure classify helpers for executeTarget's retry loop.
 * Lift-as-is from combo.ts #8375 / #2101 / #4279. No I/O.
 *
 * @internal — not part of the public combo.ts barrel.
 */
import {
  isContextOverflow400,
  isInputBoundRequestFailure,
  isModelScoped400,
  isParamValidation400,
} from "./comboPredicates.ts";

export function remainderIsHomogeneous(
  orderedTargets: { modelStr: string }[],
  index: number,
  modelStr: string
): boolean {
  return orderedTargets.slice(index + 1).every((nextInPool) => nextInPool.modelStr === modelStr);
}

export function shouldAbortOnInputBoundFailure(opts: {
  structuredError: unknown;
  remainderIsHomogeneous: boolean;
}): boolean {
  const structured = opts.structuredError as
    { code?: string | null; type?: string | null } | undefined;
  return isInputBoundRequestFailure(structured) && opts.remainderIsHomogeneous;
}

/**
 * #2101 / #4279: body-specific 400 must surface via {ok,response}, not null.
 * Same predicate chain as combo.ts (overflow / param / model-scoped excluded).
 */
export function shouldSurfaceBodySpecific400(opts: {
  status: number;
  errorText: string;
  shouldFallback: boolean;
}): boolean {
  const errorText = opts.errorText;
  return (
    opts.status === 400 &&
    opts.shouldFallback &&
    !isContextOverflow400(errorText) &&
    !isParamValidation400(errorText) &&
    !isModelScoped400(errorText) &&
    (errorText.toLowerCase().includes("context") ||
      errorText.toLowerCase().includes("prompt") ||
      errorText.toLowerCase().includes("token") ||
      errorText.toLowerCase().includes("malformed") ||
      errorText.toLowerCase().includes("invalid") ||
      errorText.toLowerCase().includes("bad request"))
  );
}