using System.Collections.Generic;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using Mvc.Server.Models;
using OpenIddict.Abstractions;
using OpenIddict.Validation.AspNetCore;
using static OpenIddict.Abstractions.OpenIddictConstants;

namespace Mvc.Server.Controllers
{
    [Route("api")]
    public class ResourceController : Controller
    {
        private readonly UserManager<ApplicationUser> _userManager;

        public ResourceController(UserManager<ApplicationUser> userManager)
            => _userManager = userManager;

        [Authorize(AuthenticationSchemes = OpenIddictValidationAspNetCoreDefaults.AuthenticationScheme)]
        [HttpGet("message")]
        public async Task<IActionResult> GetMessage()
        {
            // This demo action requires that the client application be granted the "demo_api" scope.
            // If it was not granted, a detailed error is returned to the client application to inform it
            // that the authorization process must be restarted with the specified scope to access this API.
            if (!User.HasScope("demo_api"))
            {
                return Forbid(
                    authenticationSchemes: OpenIddictValidationAspNetCoreDefaults.AuthenticationScheme,
                    properties: new AuthenticationProperties(new Dictionary<string, string>
                    {
                        [OpenIddictValidationAspNetCoreConstants.Properties.Scope] = "demo_api",
                        [OpenIddictValidationAspNetCoreConstants.Properties.Error] = Errors.InsufficientScope,
                        [OpenIddictValidationAspNetCoreConstants.Properties.ErrorDescription] =
                            "The 'demo_api' scope is required to perform this action."
                    }));
            }

            var user = await _userManager.GetUserAsync(User);
            if (user == null)
            {
                return Challenge(OpenIddictValidationAspNetCoreDefaults.AuthenticationScheme);
            }

            return Content($"{user.UserName} has been successfully authenticated.");
        }
    }
}