Aberwyn/Aberwyn/Data/IdentityDataInitializer.cs

using Microsoft.AspNetCore.Identity;
using Microsoft.Extensions.DependencyInjection;
using Aberwyn.Models;

namespace Aberwyn.Data
{
    public static class IdentityDataInitializer
    {
        public static async Task SeedData(IServiceProvider serviceProvider)
        {
            var userManager = serviceProvider.GetRequiredService<UserManager<ApplicationUser>>();
            var roleManager = serviceProvider.GetRequiredService<RoleManager<IdentityRole>>();

            string[] roles = { "Admin", "Chef", "Budget" };

            foreach (var role in roles)
            {
                if (!await roleManager.RoleExistsAsync(role))
                    await roleManager.CreateAsync(new IdentityRole(role));
            }

            string adminUsername = "admin";
            string adminEmail = "admin@localhost";
            string password = "Admin123!";

            if (await userManager.FindByEmailAsync(adminEmail) == null)
            {
                var user = new ApplicationUser
                {
                    UserName = adminUsername,
                    Email = adminEmail,
                    EmailConfirmed = true
                };

                var result = await userManager.CreateAsync(user, password);

                if (result.Succeeded)
                {
                    await userManager.AddToRoleAsync(user, "Admin");
                }
            }
        }
    }
}