using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.Logging;

using System;

using System.Collections.Generic;

using System.Net.Http;

using System.Net.Http.Json;

using System.Threading.Tasks;

​

internal class Program

{

    public static async Task Main()

    {

        IServiceCollection services = new ServiceCollection();

        services.AddLogging(d => d.AddConsole());

        services.AddHttpClient<ICustomerSupportClient, CustomerSupportClient>(d =>

        {

            d.BaseAddress = new Uri("https://f6b15272-4aef-4b16-9582-71f6074bb4ed.mock.pstmn.io");

        });

        services.AddSingleton<Program>();

        services.AddScoped<ICustomerSupportRepository, CustomerSupportRepository>();

        IServiceProvider serviceProvider = services.BuildServiceProvider();

        ILogger logger = serviceProvider.GetService<ILogger<Program>>();

        ICustomerSupportClient client = serviceProvider.GetService<ICustomerSupportClient>();

​

        logger.LogInformation("Demonstrating that server is live and actively returning results.");

        IEnumerable<Customer> customers = await client.GetAllCustomersAsync();

        foreach (var customer in customers)

        {

            logger.LogInformation("Id: {CustomerId}, Name: {Name}", customer.Id, customer.Name);

        }

​

        try

        {

            Program app = serviceProvider.GetRequiredService<Program>();

            app.Run();

        }

        catch (Exception ex)

        {

            logger.LogError(ex, "Application failed.");

        }

    }

    private readonly ILogger _logger;

    private readonly ICustomerSupportRepository _customerSupportRepository;

    public Program(ILogger<Program> logger, ICustomerSupportRepository customerSupportRepository)

    {

        _logger = logger;

        _customerSupportRepository = customerSupportRepository;

    }

    public void Run()

    {

        _logger.LogInformation("Running application tasks");

        ////** TASKS **////

        // 1: Log each ticket id and its status

        // 2: Log the customer id(s) of the customers with the most tickets

        // 3: Log the total number of tickets

        // 3: Log only tickets with the "Open" status

        // 4: Log an ordered list of tickets by severity level, 1's being first

    }

}

​

internal interface ICustomerSupportRepository

{

}

​

internal class CustomerSupportRepository : ICustomerSupportRepository

{

    private readonly ICustomerSupportClient _customerSupportClient;

    public CustomerSupportRepository(ICustomerSupportClient customerSupportClient)

    {

        _customerSupportClient = customerSupportClient;

    }

}

​

public class Customer

{

    public int? Id { get; set; }

​

    public string Name { get; set; }

}

​

public class SupportTicket

{

    public int CustomerId { get; set; }

​

    public int CreatedByUserId { get; set; }

​

    public DateTime CreatedDate { get; set; }

​

    /// <summary>

    /// 1-5 with 1 being very important and 5 being completely ignored

    /// </summary>

    public int Severity { get; set; }

​

    public string Description { get; set; }

​

    public string Status { get; set; }

}

​

public class SupportComment

{

    public int UserId { get; set; }

​

    public DateTime CreatedDate { get; set; }

​

    public string Comment { get; set; }

}

​

internal interface ICustomerSupportClient

{

    Task<IEnumerable<Customer>> GetAllCustomersAsync();

    Task<IEnumerable<SupportTicket>> GetAllTicketsAsync();

}

​

internal class CustomerSupportClient : ICustomerSupportClient

{

    private readonly HttpClient _httpClient;

    public CustomerSupportClient(HttpClient httpClient)

    {

        _httpClient = httpClient;

    }

​

    /// https://f6b15272-4aef-4b16-9582-71f6074bb4ed.mock.pstmn.io/support/customers

    public async Task<IEnumerable<Customer>> GetAllCustomersAsync()

    {

        return await _httpClient.GetFromJsonAsync<List<Customer>>("support/customers");

    }

​

    /// https://f6b15272-4aef-4b16-9582-71f6074bb4ed.mock.pstmn.io/support/tickets

    public async Task<IEnumerable<SupportTicket>> GetAllTicketsAsync()

    {

        return await _httpClient.GetFromJsonAsync<List<SupportTicket>>("support/tickets");

    }

}