import { applyAuthChoiceLoadedPluginProvider } from "../plugins/provider-auth-choice.js";
import type { ApplyAuthChoiceParams, ApplyAuthChoiceResult } from "./auth-choice.apply.types.js";
import type { AuthChoice } from "./onboard-types.js";

export type { ApplyAuthChoiceParams, ApplyAuthChoiceResult } from "./auth-choice.apply.types.js";

async function normalizeLegacyChoice(
  authChoice: AuthChoice | undefined,
  params: Pick<ApplyAuthChoiceParams, "config" | "env">,
): Promise<AuthChoice | undefined> {
  if (authChoice === "oauth") {
    return "setup-token";
  }
  if (typeof authChoice !== "string" || !authChoice.endsWith("-cli")) {
    return authChoice;
  }
  const { normalizeLegacyOnboardAuthChoice } = await import("./auth-choice-legacy.js");
  return normalizeLegacyOnboardAuthChoice(authChoice, params);
}

async function normalizeTokenProviderChoice(params: {
  authChoice: AuthChoice;
  source: ApplyAuthChoiceParams;
}): Promise<AuthChoice> {
  if (!params.source.opts?.tokenProvider) {
    return params.authChoice;
  }
  if (
    params.authChoice !== "apiKey" &&
    params.authChoice !== "token" &&
    params.authChoice !== "setup-token"
  ) {
    return params.authChoice;
  }
  const { normalizeApiKeyTokenProviderAuthChoice } =
    await import("./auth-choice.apply.api-providers.js");
  return normalizeApiKeyTokenProviderAuthChoice({
    authChoice: params.authChoice,
    tokenProvider: params.source.opts.tokenProvider,
    config: params.source.config,
    env: params.source.env,
  });
}

export async function applyAuthChoice(
  params: ApplyAuthChoiceParams,
): Promise<ApplyAuthChoiceResult> {
  const normalizedAuthChoice =
    (await normalizeLegacyChoice(params.authChoice, {
      config: params.config,
      env: params.env,
    })) ?? params.authChoice;
  const normalizedProviderAuthChoice = await normalizeTokenProviderChoice({
    authChoice: normalizedAuthChoice,
    source: params,
  });
  const normalizedParams =
    normalizedProviderAuthChoice === params.authChoice
      ? params
      : { ...params, authChoice: normalizedProviderAuthChoice };
  const result = await applyAuthChoiceLoadedPluginProvider(normalizedParams);
  if (result) {
    return result;
  }

  if (normalizedParams.authChoice === "token" || normalizedParams.authChoice === "setup-token") {
    throw new Error(
      [
        `Auth choice "${normalizedParams.authChoice}" was not matched to a provider setup flow.`,
        'For Anthropic legacy token auth, use "setup-token" with tokenProvider="anthropic" or choose the Anthropic setup-token entry explicitly.',
      ].join("\n"),
    );
  }

  if (normalizedParams.authChoice === "oauth") {
    throw new Error(
      'Auth choice "oauth" is no longer supported directly. Use "setup-token" for Anthropic legacy token auth or a provider-specific OAuth entry.',
    );
  }

  return { config: normalizedParams.config };
}