// Call SampleData.Initialize(app.ApplicationServices).Wait(); in Startup.cs

public class SampleData
{
	public static async Task InitializeAsync(IServiceProvider serviceProvider)
	{
		IServiceScope serviceScope = serviceProvider.GetService<IServiceScopeFactory>().CreateScope();
		var context = serviceProvider.GetService<ApplicationDbContext>();
		var userManager = serviceProvider.GetService<UserManager<IdentityUser>>();
		var roleManager = serviceProvider.GetService<RoleManager<IdentityRole>>();

		string[] roles = new string[] { "Administrator", "User"};

		foreach (string roleName in roles)
		{
			var isExist = await roleManager.RoleExistsAsync(roleName);
			if (!isExist)
			{
				await roleManager.CreateAsync(new IdentityRole(roleName));
			}
		}
		var user = new IdentityUser
		{
			Email = "utharn.b@rmutsb.ac.th",
			UserName = "utharn.b@rmutsb.ac.th",
			SecurityStamp = Guid.NewGuid().ToString()
		};
		var currentUser = await userManager.FindByEmailAsync(user.Email);
		if (currentUser == null)
		{
			var result = await userManager.CreateAsync(user, "Secret123!");
			currentUser = await userManager.FindByEmailAsync(user.Email);
		}
		var isAdmin = await userManager.IsInRoleAsync(currentUser, "Administrator");
		if (!isAdmin)
		{
			await userManager.AddToRoleAsync(user, "Administrator");
		}
		var isUser = await userManager.IsInRoleAsync(currentUser, "User");
		if (!isUser)
		{
			await userManager.AddToRoleAsync(user, "User");
		}
		var containSampleBook = await context.Books.AnyAsync(b => b.Name == "Sample Book");
		if (!containSampleBook)
		{
			context.Books.Add(new Models.Book
			{
				Name = "Sample Book",
				Price = 100.00m
			});
		}
		await context.SaveChangesAsync();
	}
}