import type { MapProviderId } from "./contracts.js";
import { MapRuntimeError } from "./runtime.js";

export type ProviderEndpoint = {
  assetId: string;
  type: "IMAGERY" | "TERRAIN" | "3DTILES";
  externalType?: "BING";
  credentialMode: "gateway";
  url?: string;
  options?: {
    url?: string;
    mapStyle?: string;
  };
  attributions: readonly {
    html?: string;
    collapsible?: boolean;
  }[];
};

export function parseProviderEndpoint(
  document: Record<string, unknown>,
  expectedAssetId: number,
  providerId: MapProviderId,
): ProviderEndpoint {
  const expectedType =
    providerId === "imagery"
      ? "IMAGERY"
      : providerId === "terrain"
        ? "TERRAIN"
        : "3DTILES";
  if (
    document.assetId !== String(expectedAssetId) ||
    document.type !== expectedType ||
    document.credentialMode !== "gateway" ||
    !Array.isArray(document.attributions)
  ) {
    throw new MapRuntimeError("map_provider_contract_mismatch");
  }
  if (
    (providerId === "imagery" &&
      (document.externalType !== "BING" ||
        !isEndpointOptions(document.options) ||
        typeof document.options.url !== "string")) ||
    (providerId !== "imagery" && typeof document.url !== "string")
  ) {
    throw new MapRuntimeError("map_provider_contract_mismatch");
  }
  return document as ProviderEndpoint;
}

function isEndpointOptions(
  value: unknown,
): value is NonNullable<ProviderEndpoint["options"]> {
  return typeof value === "object" && value !== null && !Array.isArray(value);
}