// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using System;
using System.Collections.Generic;
using System.Net.Http;
using Microsoft.AspNet.Http;
using Microsoft.AspNet.Http.Authentication;

namespace Microsoft.AspNet.Authentication.OAuth
{
    /// <summary>
    /// Configuration options for <see cref="OAuthMiddleware"/>.
    /// </summary>
    public class OAuthOptions : AuthenticationOptions
    {
        /// <summary>
        /// Gets or sets the provider-assigned client id.
        /// </summary>
        public string ClientId { get; set; }

        /// <summary>
        /// Gets or sets the provider-assigned client secret.
        /// </summary>
        public string ClientSecret { get; set; }

        /// <summary>
        /// Gets or sets the URI where the client will be redirected to authenticate.
        /// </summary>
        public string AuthorizationEndpoint { get; set; }

        /// <summary>
        /// Gets or sets the URI the middleware will access to exchange the OAuth token.
        /// </summary>
        public string TokenEndpoint { get; set; }

        /// <summary>
        /// Gets or sets the URI the middleware will access to obtain the user information.
        /// This value is not used in the default implementation, it is for use in custom implementations of
        /// IOAuthAuthenticationEvents.Authenticated or OAuthAuthenticationHandler.CreateTicketAsync.
        /// </summary>
        public string UserInformationEndpoint { get; set; }

        /// <summary>
        /// Get or sets the text that the user can display on a sign in user interface.
        /// </summary>
        public string Caption
        {
            get { return Description.Caption; }
            set { Description.Caption = value; }
        }

        /// <summary>
        /// Gets or sets timeout value in milliseconds for back channel communications with the auth provider.
        /// </summary>
        /// <value>
        /// The back channel timeout.
        /// </value>
        public TimeSpan BackchannelTimeout { get; set; } = TimeSpan.FromSeconds(60);

        /// <summary>
        /// The HttpMessageHandler used to communicate with the auth provider.
        /// This cannot be set at the same time as BackchannelCertificateValidator unless the value 
        /// can be downcast to a WebRequestHandler.
        /// </summary>
        public HttpMessageHandler BackchannelHttpHandler { get; set; }

        /// <summary>
        /// Gets or sets the <see cref="IOAuthEvents"/> used to handle authentication events.
        /// </summary>
        public IOAuthEvents Events { get; set; } = new OAuthEvents();

        /// <summary>
        /// A list of permissions to request.
        /// </summary>
        public IList<string> Scope { get; } = new List<string>();

        /// <summary>
        /// The request path within the application's base path where the user-agent will be returned.
        /// The middleware will process this request when it arrives.
        /// </summary>
        public PathString CallbackPath { get; set; }

        /// <summary>
        /// Gets or sets the authentication scheme corresponding to the middleware
        /// responsible of persisting user's identity after a successful authentication.
        /// This value typically corresponds to a cookie middleware registered in the Startup class.
        /// When omitted, <see cref="SharedAuthenticationOptions.SignInScheme"/> is used as a fallback value.
        /// </summary>
        public string SignInScheme { get; set; }

        /// <summary>
        /// Gets or sets the type used to secure data handled by the middleware.
        /// </summary>
        public ISecureDataFormat<AuthenticationProperties> StateDataFormat { get; set; }

        /// <summary>
        /// Defines whether access and refresh tokens should be stored in the
        /// <see cref="ClaimsPrincipal"/> after a successful authentication.
        /// You can set this property to <c>false</c> to reduce the size of the final
        /// authentication cookie. Note that social providers set this property to <c>false</c> by default.
        /// </summary>
        public bool SaveTokensAsClaims { get; set; } = true;
    }
}