// 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 Microsoft.AspNet.Http;

namespace Microsoft.AspNet.Authentication.OAuth
{
    /// <summary>
    /// Base class used for certain event contexts
    /// </summary>
    public abstract class BaseValidatingContext<TOptions> : BaseContext<TOptions>
    {
        /// <summary>
        /// Initializes base class used for certain event contexts
        /// </summary>
        protected BaseValidatingContext(
            HttpContext context,
            TOptions options)
            : base(context, options)
        {
        }

        /// <summary>
        /// True if application code has called any of the Validate methods on this context.
        /// </summary>
        public bool IsValidated { get; private set; }

        /// <summary>
        /// True if application code has called any of the SetError methods on this context.
        /// </summary>
        public bool HasError { get; private set; }

        /// <summary>
        /// The error argument provided when SetError was called on this context. This is eventually
        /// returned to the client app as the OAuth "error" parameter.
        /// </summary>
        public string Error { get; private set; }

        /// <summary>
        /// The optional errorDescription argument provided when SetError was called on this context. This is eventually
        /// returned to the client app as the OAuth "error_description" parameter.
        /// </summary>
        public string ErrorDescription { get; private set; }

        /// <summary>
        /// The optional errorUri argument provided when SetError was called on this context. This is eventually
        /// returned to the client app as the OAuth "error_uri" parameter.
        /// </summary>
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1056:UriPropertiesShouldNotBeStrings", Justification = "error_uri is a string value in the protocol")]
        public string ErrorUri { get; private set; }

        /// <summary>
        /// Marks this context as validated by the application. IsValidated becomes true and HasError becomes false as a result of calling.
        /// </summary>
        /// <returns>True if the validation has taken effect.</returns>
        public virtual bool Validated()
        {
            IsValidated = true;
            HasError = false;
            return true;
        }

        /// <summary>
        /// Marks this context as not validated by the application. IsValidated and HasError become false as a result of calling.
        /// </summary>
        public virtual void Rejected()
        {
            IsValidated = false;
            HasError = false;
        }

        /// <summary>
        /// Marks this context as not validated by the application and assigns various error information properties. 
        /// HasError becomes true and IsValidated becomes false as a result of calling.
        /// </summary>
        /// <param name="error">Assigned to the Error property</param>
        public void SetError(string error)
        {
            SetError(error, null);
        }

        /// <summary>
        /// Marks this context as not validated by the application and assigns various error information properties. 
        /// HasError becomes true and IsValidated becomes false as a result of calling.
        /// </summary>
        /// <param name="error">Assigned to the Error property</param>
        /// <param name="errorDescription">Assigned to the ErrorDescription property</param>
        public void SetError(string error,
            string errorDescription)
        {
            SetError(error, errorDescription, null);
        }

        /// <summary>
        /// Marks this context as not validated by the application and assigns various error information properties. 
        /// HasError becomes true and IsValidated becomes false as a result of calling.
        /// </summary>
        /// <param name="error">Assigned to the Error property</param>
        /// <param name="errorDescription">Assigned to the ErrorDescription property</param>
        /// <param name="errorUri">Assigned to the ErrorUri property</param>
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "2#", Justification = "error_uri is a string value in the protocol")]
        public void SetError(string error,
            string errorDescription,
            string errorUri)
        {
            Error = error;
            ErrorDescription = errorDescription;
            ErrorUri = errorUri;
            Rejected();
            HasError = true;
        }
    }
}