/*
 * Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
 * See https://github.com/openiddict/openiddict-core for more information concerning
 * the license and the contributors participating to this project.
 */

using System;
using System.Collections.Generic;
using System.Security.Claims;
using JetBrains.Annotations;
using System.Text.Json;
using OpenIddict.Abstractions;

namespace OpenIddict.Server
{
    public static partial class OpenIddictServerEvents
    {
        /// <summary>
        /// Represents an event called for each request to the userinfo endpoint to give the user code
        /// a chance to manually extract the userinfo request from the ambient HTTP context.
        /// </summary>
        public class ExtractUserinfoRequestContext : BaseValidatingContext
        {
            /// <summary>
            /// Creates a new instance of the <see cref="ExtractUserinfoRequestContext"/> class.
            /// </summary>
            public ExtractUserinfoRequestContext([NotNull] OpenIddictServerTransaction transaction)
                : base(transaction)
            {
            }
        }

        /// <summary>
        /// Represents an event called for each request to the userinfo endpoint
        /// to determine if the request is valid and should continue to be processed.
        /// </summary>
        public class ValidateUserinfoRequestContext : BaseValidatingContext
        {
            /// <summary>
            /// Creates a new instance of the <see cref="ValidateUserinfoRequestContext"/> class.
            /// </summary>
            public ValidateUserinfoRequestContext([NotNull] OpenIddictServerTransaction transaction)
                : base(transaction)
            {
            }

            /// <summary>
            /// Gets or sets the security principal extracted from the access token, if available.
            /// </summary>
            public ClaimsPrincipal Principal { get; set; }
        }

        /// <summary>
        /// Represents an event called for each validated userinfo request
        /// to allow the user code to decide how the request should be handled.
        /// </summary>
        public class HandleUserinfoRequestContext : BaseValidatingContext
        {
            /// <summary>
            /// Creates a new instance of the <see cref="HandleUserinfoRequestContext"/> class.
            /// </summary>
            public HandleUserinfoRequestContext([NotNull] OpenIddictServerTransaction transaction)
                : base(transaction)
            {
            }

            /// <summary>
            /// Gets or sets the security principal extracted from the access token.
            /// </summary>
            public ClaimsPrincipal Principal { get; set; }

            /// <summary>
            /// Gets the additional claims returned to the client application.
            /// </summary>
            public IDictionary<string, OpenIddictParameter> Claims { get; } =
                new Dictionary<string, OpenIddictParameter>(StringComparer.Ordinal);

            /// <summary>
            /// Gets or sets the value used for the "address" claim.
            /// Note: this value should only be populated if the "address"
            /// scope was requested and accepted by the resource owner.
            /// </summary>
            public JsonElement Address { get; set; }

            /// <summary>
            /// Gets or sets the values used for the "aud" claim.
            /// </summary>
            public HashSet<string> Audiences { get; } = new HashSet<string>(StringComparer.Ordinal);

            /// <summary>
            /// Gets or sets the value used for the "birthdate" claim.
            /// Note: this value should only be populated if the "profile"
            /// scope was requested and accepted by the resource owner.
            /// </summary>
            public string BirthDate { get; set; }

            /// <summary>
            /// Gets or sets the value used for the "email" claim.
            /// Note: this value should only be populated if the "email"
            /// scope was requested and accepted by the resource owner.
            /// </summary>
            public string Email { get; set; }

            /// <summary>
            /// Gets or sets the value used for the "email_verified" claim.
            /// Note: this value should only be populated if the "email"
            /// scope was requested and accepted by the resource owner.
            /// </summary>
            public bool? EmailVerified { get; set; }

            /// <summary>
            /// Gets or sets the value used for the "family_name" claim.
            /// Note: this value should only be populated if the "profile"
            /// scope was requested and accepted by the resource owner.
            /// </summary>
            public string FamilyName { get; set; }

            /// <summary>
            /// Gets or sets the value used for the "given_name" claim.
            /// Note: this value should only be populated if the "profile"
            /// scope was requested and accepted by the resource owner.
            /// </summary>
            public string GivenName { get; set; }

            /// <summary>
            /// Gets or sets the value used for the "phone_number" claim.
            /// Note: this value should only be populated if the "phone"
            /// scope was requested and accepted by the resource owner.
            /// </summary>
            public string PhoneNumber { get; set; }

            /// <summary>
            /// Gets or sets the value used for the "phone_number_verified" claim.
            /// Note: this value should only be populated if the "phone"
            /// scope was requested and accepted by the resource owner.
            /// </summary>
            public bool? PhoneNumberVerified { get; set; }

            /// <summary>
            /// Gets or sets the value used for the "preferred_username" claim.
            /// Note: this value should only be populated if the "profile"
            /// scope was requested and accepted by the resource owner.
            /// </summary>
            public string PreferredUsername { get; set; }

            /// <summary>
            /// Gets or sets the value used for the "profile" claim.
            /// Note: this value should only be populated if the "profile"
            /// scope was requested and accepted by the resource owner.
            /// </summary>
            public string Profile { get; set; }

            /// <summary>
            /// Gets or sets the unique value
            /// used for the mandatory "sub" claim.
            /// </summary>
            public string Subject { get; set; }

            /// <summary>
            /// Gets or sets the value used for the "website" claim.
            /// Note: this value should only be populated if the "profile"
            /// scope was requested and accepted by the resource owner.
            /// </summary>
            public string Website { get; set; }
        }

        /// <summary>
        /// Represents an event called before the userinfo response is returned to the caller.
        /// </summary>
        public class ApplyUserinfoResponseContext : BaseRequestContext
        {
            /// <summary>
            /// Creates a new instance of the <see cref="ApplyUserinfoResponseContext"/> class.
            /// </summary>
            public ApplyUserinfoResponseContext([NotNull] OpenIddictServerTransaction transaction)
                : base(transaction)
            {
            }

            /// <summary>
            /// Gets the error code returned to the client application.
            /// When the response indicates a successful response,
            /// this property returns <c>null</c>.
            /// </summary>
            public string Error => Response.Error;
        }
    }
}