/*
 * 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.Security.Claims;

namespace OpenIddict.Server;

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

        /// <summary>
        /// Gets or sets the request, or <see langword="null"/> if it wasn't extracted yet.
        /// </summary>
        public OpenIddictRequest? Request
        {
            get => Transaction.Request;
            set => Transaction.Request = value;
        }
    }

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

        /// <summary>
        /// Gets or sets the request.
        /// </summary>
        public OpenIddictRequest Request
        {
            get => Transaction.Request!;
            set => Transaction.Request = value;
        }

        /// <summary>
        /// Gets or sets the security principal extracted from the actor token, if applicable.
        /// </summary>
        public ClaimsPrincipal? ActorTokenPrincipal { get; set; }

        /// <summary>
        /// Gets or sets the security principal extracted from the authorization code, if applicable.
        /// </summary>
        public ClaimsPrincipal? AuthorizationCodePrincipal { get; set; }

        /// <summary>
        /// Gets or sets the security principal extracted from the device code, if applicable.
        /// </summary>
        public ClaimsPrincipal? DeviceCodePrincipal { get; set; }

        /// <summary>
        /// Gets or sets the security principal extracted from the refresh token, if applicable.
        /// </summary>
        public ClaimsPrincipal? RefreshTokenPrincipal { get; set; }

        /// <summary>
        /// Gets or sets the security principal extracted from the subject token, if applicable.
        /// </summary>
        public ClaimsPrincipal? SubjectTokenPrincipal { get; set; }
    }

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

        /// <summary>
        /// Gets or sets the request.
        /// </summary>
        public OpenIddictRequest Request
        {
            get => Transaction.Request!;
            set => Transaction.Request = value;
        }

        /// <summary>
        /// Gets or sets the security principal extracted from the actor token, if applicable.
        /// </summary>
        public ClaimsPrincipal? ActorTokenPrincipal { get; set; }

        /// <summary>
        /// Gets or sets the security principal extracted from the authorization code, if applicable.
        /// </summary>
        public ClaimsPrincipal? AuthorizationCodePrincipal { get; set; }

        /// <summary>
        /// Gets or sets the security principal extracted from the device code, if applicable.
        /// </summary>
        public ClaimsPrincipal? DeviceCodePrincipal { get; set; }

        /// <summary>
        /// Gets or sets the security principal extracted from the refresh token, if applicable.
        /// </summary>
        public ClaimsPrincipal? RefreshTokenPrincipal { get; set; }

        /// <summary>
        /// Gets or sets the security principal extracted from the subject token, if applicable.
        /// </summary>
        public ClaimsPrincipal? SubjectTokenPrincipal { get; set; }

        /// <summary>
        /// Gets the additional parameters returned to the client application.
        /// </summary>
        public Dictionary<string, OpenIddictParameter> Parameters { get; private set; }
            = new(StringComparer.Ordinal);

        /// <summary>
        /// Allows OpenIddict to return a sign-in response using the specified principal.
        /// </summary>
        /// <param name="principal">The claims principal.</param>
        public void SignIn(ClaimsPrincipal principal) => Principal = principal;

        /// <summary>
        /// Allows OpenIddict to return a sign-in response using the specified principal.
        /// </summary>
        /// <param name="principal">The claims principal.</param>
        /// <param name="parameters">The additional parameters returned to the client application.</param>
        public void SignIn(ClaimsPrincipal principal, IDictionary<string, OpenIddictParameter> parameters)
        {
            Principal = principal;
            Parameters = new(parameters, StringComparer.Ordinal);
        }
    }

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

        /// <summary>
        /// Gets or sets the request, or <see langword="null"/> if it couldn't be extracted.
        /// </summary>
        public OpenIddictRequest? Request
        {
            get => Transaction.Request;
            set => Transaction.Request = value;
        }

        /// <summary>
        /// Gets or sets the response.
        /// </summary>
        public OpenIddictResponse Response
        {
            get => Transaction.Response!;
            set => Transaction.Response = value;
        }

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