import { AuthenticationClient, Scopes, TwoLeggedToken } from "@aps_sdk/authentication";

export interface IAuthenticationProvider {
    getToken(scopes: Scopes[]): Promise<string>;
}

export class BasicAuthenticationProvider implements IAuthenticationProvider {
    constructor(protected accessToken: string) { }

    async getToken(scopes: Scopes[]): Promise<string> {
        // TODO: check if the hard-coded token has all the needed scopes
        return this.accessToken;
    }
}

export class TwoLeggedAuthenticationProvider implements IAuthenticationProvider {
    protected authenticationClient: AuthenticationClient;
    protected lastCredentials: TwoLeggedToken | null = null;

    constructor(protected clientId: string, protected clientSecret: string) {
        this.authenticationClient = new AuthenticationClient();
    }

    async getToken(scopes: Scopes[]): Promise<string> {
        if (!this.lastCredentials || Date.now() > this.lastCredentials.expires_at!) {
            console.log('Refreshing token...');
            this.lastCredentials = await this.authenticationClient.getTwoLeggedToken(this.clientId, this.clientSecret, scopes);
        }
        return this.lastCredentials.access_token;
    }
}