/**
 * Install-level client config loading and InspectorClient auth option wiring
 * for Node runners (TUI, CLI).
 */

import type { SecretStore } from "../auth/node/secret-store.js";
import { defaultSecretStore } from "../auth/node/secret-store-selection.js";
import type {
  InspectorClientOptions,
  InspectorServerSettings,
} from "../mcp/types.js";
import {
  oauthAuthorizationParamsFromSettings,
  oauthEndpointOverridesFromSettings,
} from "../mcp/serverList.js";
import { loadClientConfig } from "./config.js";
import type { ClientConfig } from "./types.js";
import {
  getActiveCimdClientMetadataUrl,
  getActiveEnterpriseManagedAuthIdp,
} from "./types.js";

export interface LoadRunnerClientConfigOptions {
  /** Explicit path from `--client-config` (or MCP_CLIENT_CONFIG_PATH when unset). */
  clientConfigPath?: string;
  /** Secret store for the IdP clientSecret; defaults to the store selected for
   * this host (OS keychain, or its file/memory fallback). Tests inject an
   * in-memory store for determinism. */
  secretStore?: SecretStore;
}

/** Load install-level client.json with keychain-backed IdP secrets. */
export async function loadRunnerClientConfig(
  options?: LoadRunnerClientConfigOptions,
): Promise<ClientConfig> {
  const customPath =
    options?.clientConfigPath?.trim() ||
    process.env.MCP_CLIENT_CONFIG_PATH?.trim() ||
    undefined;
  const secretStore = options?.secretStore ?? defaultSecretStore();
  return loadClientConfig({ filePath: customPath, secretStore });
}

export interface RunnerClientConfigOverrides {
  clientId?: string;
  clientSecret?: string;
  clientMetadataUrl?: string;
}

/** HTTP transports (SSE, streamable-http) can use OAuth. */
export function isOAuthCapableServerConfig(
  config: { type?: string } | null | undefined,
): boolean {
  if (!config) return false;
  return config.type === "sse" || config.type === "streamable-http";
}

/**
 * Derive OAuth / EMA / CIMD InspectorClient options from install client.json,
 * per-server settings, and CLI flag overrides (flags win over client.json).
 */
export function buildRunnerClientAuthOptions(
  clientConfig: ClientConfig,
  savedSettings?: InspectorServerSettings,
  cliOverrides?: RunnerClientConfigOverrides,
): Pick<
  InspectorClientOptions,
  | "oauth"
  | "enterpriseManagedAuth"
  | "installEnterpriseManagedAuth"
  | "directAuthRecovery"
> {
  const activeIdp = getActiveEnterpriseManagedAuthIdp(clientConfig);
  const activeCimdUrl = getActiveCimdClientMetadataUrl(clientConfig);

  const serverAuthorizationParams = savedSettings
    ? oauthAuthorizationParamsFromSettings(savedSettings)
    : undefined;
  const serverEndpointOverrides = savedSettings
    ? oauthEndpointOverridesFromSettings(savedSettings)
    : undefined;

  const oauthFromServer =
    savedSettings &&
    (savedSettings.oauthClientId ||
      savedSettings.oauthClientSecret ||
      savedSettings.oauthScopes ||
      serverAuthorizationParams ||
      serverEndpointOverrides ||
      savedSettings.enterpriseManaged ||
      savedSettings.oauthRequestRefreshToken === false)
      ? {
          ...(savedSettings.oauthClientId && {
            clientId: savedSettings.oauthClientId,
          }),
          ...(savedSettings.oauthClientSecret && {
            clientSecret: savedSettings.oauthClientSecret,
          }),
          ...(savedSettings.oauthScopes && {
            scope: savedSettings.oauthScopes,
          }),
          ...(serverAuthorizationParams && {
            authorizationParams: serverAuthorizationParams,
          }),
          ...serverEndpointOverrides,
          ...(savedSettings.enterpriseManaged && {
            enterpriseManaged: true,
          }),
          // #2068: only the explicit opt-out is forwarded; omitting the key
          // leaves the provider's default (declare `refresh_token`) in place.
          ...(savedSettings.oauthRequestRefreshToken === false && {
            requestRefreshToken: false,
          }),
        }
      : undefined;

  const clientMetadataUrl =
    cliOverrides?.clientMetadataUrl?.trim() || activeCimdUrl;

  const oauthFromCli =
    cliOverrides?.clientId || cliOverrides?.clientSecret || clientMetadataUrl
      ? {
          ...(cliOverrides?.clientId && { clientId: cliOverrides.clientId }),
          ...(cliOverrides?.clientSecret && {
            clientSecret: cliOverrides.clientSecret,
          }),
          ...(clientMetadataUrl && { clientMetadataUrl }),
        }
      : undefined;

  const oauth =
    oauthFromServer || oauthFromCli
      ? {
          ...(oauthFromServer ?? {}),
          ...(oauthFromCli ?? {}),
        }
      : undefined;

  return {
    ...(oauth && { oauth }),
    ...(activeIdp && {
      enterpriseManagedAuth: { idp: activeIdp },
    }),
    ...(clientConfig.enterpriseManagedAuth && {
      installEnterpriseManagedAuth: clientConfig.enterpriseManagedAuth,
    }),
    ...(oauth && { directAuthRecovery: true }),
  };
}