using gehGassi.Core.Interfaces;
using gehGassi.Web.Auth.Requirements;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using System.Threading.Tasks;
using System;

namespace gehGassi.Web.Auth.AuthorizationHandlers
{
    public class HasHeaderHandler : AuthorizationHandler<HasHeaderRequirement>
    {
        readonly IHttpContextAccessor _httpContextAccessor = null;

        public HasHeaderHandler(IHttpContextAccessor httpContextAccessor)
        {
            _httpContextAccessor = httpContextAccessor;
        }

        protected override async Task HandleRequirementAsync(AuthorizationHandlerContext context, HasHeaderRequirement requirement)
        {
            if (_httpContextAccessor.HttpContext != null)
            {
                if (_httpContextAccessor.HttpContext.Request.Headers.ContainsKey(requirement.HeaderName))
                {
                    var headerValue = _httpContextAccessor.HttpContext.Request.Headers[requirement.HeaderName];
                    if (headerValue == requirement.HeaderValue)
                    {
                        context.Succeed(requirement);
                        return;
                    }
                }
            }

            await Task.Delay(1);
            context.Fail();
        }
    }
}