// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

import { autoSignInStore } from '../../../client/utils/store';
import { AuthError } from '../../../errors/AuthError';
import { AUTO_SIGN_IN_EXCEPTION } from '../../../errors/constants';
import { AutoSignInCallback } from '../../../types/models';
import { SignInOutput } from '../types';

const initialAutoSignIn: AutoSignInCallback =
	async (): Promise<SignInOutput> => {
		throw new AuthError({
			name: AUTO_SIGN_IN_EXCEPTION,
			message:
				'The autoSignIn flow has not started, or has been cancelled/completed.',
			recoverySuggestion:
				'Please try to use the signIn API or log out before starting a new autoSignIn flow.',
		});
	};

/**
 * Signs a user in automatically after finishing the sign-up process.
 *
 * This API will automatically sign a user in if the autoSignIn flow has been completed in the following cases:
 * - User confirmed their account with a verification code sent to their phone or email (default option).
 * - User confirmed their account with a verification link sent to their phone or email. In order to
 * enable this option you need to go to the Amazon Cognito [console](https://aws.amazon.com/pm/cognito),
 * look for your userpool, then go to the `Messaging` tab and enable `link` mode inside the `Verification message` option.
 * Finally you need to define the `signUpVerificationMethod` in your `Auth` config.
 *
 * @example
 * ```typescript
 *  Amplify.configure({
 *    Auth: {
 *     Cognito: {
 *    ...cognitoConfig,
 *    signUpVerificationMethod: "link" // the default value is "code"
 *   }
 *	}});
 * ```
 *
 * @throws AutoSignInException - Thrown when the autoSignIn flow has not started, or has been cancelled/completed.
 * @returns The signInOutput.
 *
 * @example
 * ```typescript
 *  // handleSignUp.ts
 * async function handleSignUp(
 *   username:string,
 *   password:string
 * ){
 *   try {
 *     const { nextStep } = await signUp({
 *       username,
 *       password,
 *       options: {
 *         userAttributes:{ email:'email@email.com'},
 *         autoSignIn: true // This enables the auto sign-in flow.
 *       },
 *     });
 *
 *     handleSignUpStep(nextStep);
 *
 *   } catch (error) {
 *     console.log(error);
 *   }
 * }
 *
 * // handleConfirmSignUp.ts
 * async function handleConfirmSignUp(username:string, confirmationCode:string) {
 *   try {
 *     const { nextStep } = await confirmSignUp({
 *       username,
 *       confirmationCode,
 *     });
 *
 *     handleSignUpStep(nextStep);
 *   } catch (error) {
 *     console.log(error);
 *   }
 * }
 *
 * // signUpUtils.ts
 * async function handleSignUpStep( step: SignUpOutput["nextStep"]) {
 * switch (step.signUpStep) {
 *   case "CONFIRM_SIGN_UP":
 *
 *    // Redirect end-user to confirm-sign up screen.
 *
 *   case "COMPLETE_AUTO_SIGN_IN":
 *	   const codeDeliveryDetails = step.codeDeliveryDetails;
 *     if (codeDeliveryDetails) {
 *      // Redirect user to confirm-sign-up with link screen.
 *     }
 *     const signInOutput = await autoSignIn();
 *   // handle sign-in steps
 * }
 *
 * ```
 */
// TODO(Eslint): can this be refactored not using `let` on exported member?
// eslint-disable-next-line import/no-mutable-exports
export let autoSignIn: AutoSignInCallback = initialAutoSignIn;

/**
 * Sets the context of autoSignIn at run time.
 * @internal
 */
export function setAutoSignIn(callback: AutoSignInCallback) {
	autoSignIn = callback;
}

/**
 * Resets the context
 *
 * @internal
 */
export function resetAutoSignIn(resetCallback = true) {
	if (resetCallback) {
		autoSignIn = initialAutoSignIn;
	}
	autoSignInStore.dispatch({ type: 'RESET' });
}