using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;
using RestSharp;

namespace SsoExample
{
    public static class SsoUserVerification
    {
        public static RestClient RestClient = new RestClient("https://company.myabsorb.com/api/Rest/v1");
        private const string REST_USER = "<Username>";
        private const string REST_USER_PASSWORD = "<Password>";
        private const string API_KEY = "<API_KEY>";

        public static bool VerifyUser(string user)
        {
            //Generate authentication token
            var token = GetToken(REST_USER, REST_USER_PASSWORD, API_KEY);

            //Check if the user exists
            var doesUserExist = LookUpUser(token, user);

            if (!doesUserExist)
            {
                //Default department to place users in.
                var defaultDepartment = Guid.Parse("c0b49894-4674-4faf-ba6a-be86b4f7078e");
                doesUserExist = CreateUser(token, user, defaultDepartment);
            }

            return doesUserExist;
        }

        private static string GetToken(string username, string restPass, string restPrivateKey)
        {
            var request = new RestRequest("Authenticate", Method.POST);
            var authenticateModel = new {Username = username, Password = restPass, PrivateKey = restPrivateKey};

            request.AddJsonBody(authenticateModel);
            var response = RestClient.Execute(request);

            return response.Content.Trim('"');
        }

        private static bool LookUpUser(string token, string userName)
        {

            var request = new RestRequest("users", Method.GET);
            request.AddHeader("Authorization", token);

            request.AddQueryParameter("username", userName);

            var response = RestClient.Execute<List<UserModel>>(request);
            if (response.StatusCode == HttpStatusCode.OK)
            {
                //Ensure only 1 user is returned. The username should be unique so this is just a precaution. 
                return response.Data.Count == 1;
            }
            else
            {
                return false;
            }
        }

        private static bool CreateUser(string token, string username, Guid departmentId)
        {
            var userModel = new UserModel()
            {
                DepartmentId = departmentId,
                EmailAddress = username + "@company.com",
                Username = username,
                Password = "ab5orb!ap1",
                FirstName = "Firstname",
                LastName = "Lastname"
            };

            var request = new RestRequest("users", Method.POST);

            request.AddHeader("Authorization", token);
            request.AddJsonBody(userModel);

            var response = RestClient.Execute(request);

            return response.StatusCode == HttpStatusCode.Created;
        }

        private class UserModel
        {
            public Guid DepartmentId { get; set; }
            public string FirstName { get; set; }
            public string LastName { get; set; }
            public string Username { get; set; }
            public string Password { get; set; } 
            public string EmailAddress { get; set; }
        }
    }
}