import type { ProblemSpec } from "../spec/types";
import type { MethodDefinition } from "./types";
import { FD_METHOD } from "./fd";

export const METHODS: MethodDefinition[] = [FD_METHOD];

export function getMethod(id: string): MethodDefinition {
  const m = METHODS.find((x) => x.id === id);
  if (!m) throw new Error(`unknown method ${id}`);
  return m;
}

/** Reasons the method cannot run this spec, in plain words; empty when it can. */
export function methodBlockers(method: MethodDefinition, spec: ProblemSpec): string[] {
  const out: string[] = [];
  if (!method.supports.shape.includes(spec.plate.shape))
    out.push(`${method.name} has no ${spec.plate.shape} solution`);
  if (!method.supports.mount.includes(spec.mount.type))
    out.push(`${method.name} cannot handle the ${spec.mount.type} mount`);
  if (!method.supports.excitation.includes(spec.excitation.type))
    out.push(`${method.name} cannot handle the ${spec.excitation.type} excitation`);
  return out;
}