Initial

Tailspin.SpaceGame.Web.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Tailspin.SpaceGame.Web", "Tailspin.SpaceGame.Web\Tailspin.SpaceGame.Web.csproj", "{A0C4E31E-AC75-4F39-9F59-0AA19D9B8F46}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A0C4E31E-AC75-4F39-9F59-0AA19D9B8F46}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A0C4E31E-AC75-4F39-9F59-0AA19D9B8F46}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A0C4E31E-AC75-4F39-9F59-0AA19D9B8F46}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A0C4E31E-AC75-4F39-9F59-0AA19D9B8F46}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

Tailspin.SpaceGame.Web/Controllers/HomeController.cs

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+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using TailSpin.SpaceGame.Web.Models;
+
+namespace TailSpin.SpaceGame.Web.Controllers
+{
+    public class HomeController : Controller
+    {
+        // High score repository.
+        private readonly IDocumentDBRepository<Score> _scoreRepository;
+        // User profile repository.
+        private readonly IDocumentDBRepository<Profile> _profileRespository;
+
+        public HomeController(
+            IDocumentDBRepository<Score> scoreRepository,
+            IDocumentDBRepository<Profile> profileRespository
+            )
+        {
+            _scoreRepository = scoreRepository;
+            _profileRespository = profileRespository;
+        }
+
+        public async Task<IActionResult> Index(
+            int page = 1, 
+            int pageSize = 10, 
+            string mode = "",
+            string region = ""
+            )
+        {
+            // Create the view model with initial values we already know.
+            var vm = new LeaderboardViewModel
+            {
+                Page = page,
+                PageSize = pageSize,
+                SelectedMode = mode,
+                SelectedRegion = region,
+
+                GameModes = new List<string>()
+                {
+                    "Solo",
+                    "Duo",
+                    "Trio"
+                },
+
+                    GameRegions = new List<string>()
+                {
+                    "Milky Way",
+                    "Andromeda",
+                    "Pinwheel",
+                    "NGC 1300",
+                    "Messier 82",
+                }
+            };
+
+            try
+            {
+                // Form the query predicate.
+                // This expression selects all scores that match the provided game 
+                // mode and region (map).
+                // Select the score if the game mode or region is empty.
+                Expression<Func<Score, bool>> queryPredicate = score =>
+                    (string.IsNullOrEmpty(mode) || score.GameMode == mode) &&
+                    (string.IsNullOrEmpty(region) || score.GameRegion == region);
+
+                // Fetch the total number of results in the background.
+                var countItemsTask = _scoreRepository.CountItemsAsync(queryPredicate);
+
+                // Fetch the scores that match the current filter.
+                IEnumerable<Score> scores = await _scoreRepository.GetItemsAsync(
+                    queryPredicate, // the predicate defined above
+                    score => score.HighScore, // sort descending by high score
+                    page - 1, // subtract 1 to make the query 0-based
+                    pageSize
+                  );
+
+                // Wait for the total count.
+                vm.TotalResults = await countItemsTask;
+
+                // Set previous and next hyperlinks.
+                if (page > 1)
+                {
+                    vm.PrevLink = $"/?page={page - 1}&pageSize={pageSize}&mode={mode}&region={region}#leaderboard";
+                }
+                if (vm.TotalResults > page * pageSize)
+                {
+                    vm.NextLink = $"/?page={page + 1}&pageSize={pageSize}&mode={mode}&region={region}#leaderboard";
+                }
+
+                // Fetch the user profile for each score.
+                // This creates a list that's parallel with the scores collection.
+                var profiles = new List<Task<Profile>>();
+                foreach (var score in scores)
+                {
+                    profiles.Add(_profileRespository.GetItemAsync(score.ProfileId));
+                }
+                Task<Profile>.WaitAll(profiles.ToArray());
+
+                // Combine each score with its profile.
+                vm.Scores = scores.Zip(profiles, (score, profile) => new ScoreProfile { Score = score, Profile = profile.Result });
+
+                return View(vm);
+            }
+            catch (Exception ex)
+            {
+                return View(vm);
+            }
+        }
+
+        [Route("/profile/{id}")]
+        public async Task<IActionResult> Profile(string id, string rank="")
+        {
+            try
+            {
+                // Fetch the user profile with the given identifier.
+                return View(new ProfileViewModel { Profile = await _profileRespository.GetItemAsync(id), Rank = rank });
+            }
+            catch (Exception ex)
+            {
+                return RedirectToAction("/");
+            }
+        }
+
+        public IActionResult Privacy()
+        {
+            return View();
+        }
+
+        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+        public IActionResult Error()
+        {
+            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
+        }
+    }
+}

Tailspin.SpaceGame.Web/IDocumentDBRepository.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq.Expressions;
+using System.Threading.Tasks;
+using TailSpin.SpaceGame.Web.Models;
+
+namespace TailSpin.SpaceGame.Web
+{
+    public interface IDocumentDBRepository<T> where T : Model
+    {
+        /// <summary>
+        /// Retrieves the item from the store with the given identifier.
+        /// </summary>
+        /// <returns>
+        /// A task that represents the asynchronous operation.
+        /// The task result contains the retrieved item.
+        /// </returns>
+        /// <param name="id">The identifier of the item to retrieve.</param>
+        Task<T> GetItemAsync(string id);
+
+        /// <summary>
+        /// Retrieves items from the store that match the given query predicate.
+        /// Results are given in descending order by the given ordering predicate.
+        /// </summary>
+        /// <returns>
+        /// A task that represents the asynchronous operation.
+        /// The task result contains the collection of retrieved items.
+        /// </returns>
+        /// <param name="queryPredicate">Predicate that specifies which items to select.</param>
+        /// <param name="orderDescendingPredicate">Predicate that specifies how to sort the results in descending order.</param>
+        /// <param name="page">The 1-based page of results to return.</param>
+        /// <param name="pageSize">The number of items on a page.</param>
+        Task<IEnumerable<T>> GetItemsAsync(
+            Expression<Func<T, bool>> queryPredicate,
+            Expression<Func<T, int>> orderDescendingPredicate,
+            int page = 1,
+            int pageSize = 10
+        );
+
+        /// <summary>
+        /// Retrieves the number of items that match the given query predicate.
+        /// </summary>
+        /// <returns>
+        /// A task that represents the asynchronous operation.
+        /// The task result contains the number of items that match the query predicate.
+        /// </returns>
+        /// <param name="queryPredicate">Predicate that specifies which items to select.</param>
+        Task<int> CountItemsAsync(Expression<Func<T, bool>> queryPredicate);
+    }
+}

Tailspin.SpaceGame.Web/LocalDocumentDBRepository.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Threading.Tasks;
+using Newtonsoft.Json;
+using TailSpin.SpaceGame.Web.Models;
+
+namespace TailSpin.SpaceGame.Web
+{
+    public class LocalDocumentDBRepository<T> : IDocumentDBRepository<T> where T : Model
+    {
+        // An in-memory list of all items in the collection.
+        private readonly List<T> _items;
+
+        public LocalDocumentDBRepository(string fileName)
+        {
+            // Serialize the items from the provided JSON document.
+            _items = JsonConvert.DeserializeObject<List<T>>(File.ReadAllText(fileName));
+        }
+
+        /// <summary>
+        /// Retrieves the item from the store with the given identifier.
+        /// </summary>
+        /// <returns>
+        /// A task that represents the asynchronous operation.
+        /// The task result contains the retrieved item.
+        /// </returns>
+        /// <param name="id">The identifier of the item to retrieve.</param>
+        public Task<T> GetItemAsync(string id)
+        {
+            return Task<T>.FromResult(_items.Single(item => item.Id == id));
+        }
+
+        /// <summary>
+        /// Retrieves items from the store that match the given query predicate.
+        /// Results are given in descending order by the given ordering predicate.
+        /// </summary>
+        /// <returns>
+        /// A task that represents the asynchronous operation.
+        /// The task result contains the collection of retrieved items.
+        /// </returns>
+        /// <param name="queryPredicate">Predicate that specifies which items to select.</param>
+        /// <param name="orderDescendingPredicate">Predicate that specifies how to sort the results in descending order.</param>
+        /// <param name="page">The 1-based page of results to return.</param>
+        /// <param name="pageSize">The number of items on a page.</param>
+        public Task<IEnumerable<T>> GetItemsAsync(
+            Expression<Func<T, bool>> queryPredicate,
+            Expression<Func<T, int>> orderDescendingPredicate,
+            int page = 1, int pageSize = 10
+        )
+        {
+            var result = _items.AsQueryable()
+                .Where(queryPredicate) // filter
+                .OrderByDescending(orderDescendingPredicate) // sort
+                .Skip(page * pageSize) // find page
+                .Take(pageSize) // take items
+                .AsEnumerable(); // make enumeratable
+
+            return Task<IEnumerable<T>>.FromResult(result);
+        }
+
+        /// <summary>
+        /// Retrieves the number of items that match the given query predicate.
+        /// </summary>
+        /// <returns>
+        /// A task that represents the asynchronous operation.
+        /// The task result contains the number of items that match the query predicate.
+        /// </returns>
+        /// <param name="queryPredicate">Predicate that specifies which items to select.</param>
+        public Task<int> CountItemsAsync(Expression<Func<T, bool>> queryPredicate)
+        {
+            var count = _items.AsQueryable()
+                .Where(queryPredicate) // filter
+                .Count(); // count
+
+            return Task<int>.FromResult(count);
+        }
+    }
+}

Tailspin.SpaceGame.Web/Models/ErrorViewModel.cs

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+namespace TailSpin.SpaceGame.Web.Models
+{
+    public class ErrorViewModel
+    {
+        public string RequestId { get; set; }
+
+        public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+    }
+}

Tailspin.SpaceGame.Web/Models/LeaderboardViewModel.cs

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+using System.Collections.Generic;
+
+namespace TailSpin.SpaceGame.Web.Models
+{
+    public class LeaderboardViewModel
+    {
+        // The game mode selected in the view.
+        public string SelectedMode { get; set; }
+        // The game region (map) selected in the view.
+        public string SelectedRegion { get; set; }
+        // The current page to be shown in the view.
+        public int Page { get; set; }
+        // The number of items to show per page in the view.
+        public int PageSize { get; set; }
+
+        // The scores to display in the view.
+        public IEnumerable<ScoreProfile> Scores { get; set; }
+        // The game modes to display in the view.
+        public IEnumerable<string> GameModes { get; set; }
+        // The game regions (maps) to display in the view.
+        public IEnumerable<string> GameRegions { get; set; }
+
+        // Hyperlink to the previous page of results.
+        // This is empty if this is the first page.
+        public string PrevLink { get; set; }
+        // Hyperlink to the next page of results.
+        // This is empty if this is the last page.
+        public string NextLink { get; set; }
+        // The total number of results for the selected game mode and region in the view.
+        public int TotalResults { get; set; }
+    }
+
+    /// <summary>
+    /// Combines a score and a user profile.
+    /// </summary>
+    public struct ScoreProfile
+    {
+        // The player's score.
+        public Score Score;
+        // The player's profile.
+        public Profile Profile;
+    }
+}

Tailspin.SpaceGame.Web/Models/Model.cs

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+using Newtonsoft.Json;
+
+namespace TailSpin.SpaceGame.Web.Models
+{
+    /// <summary>
+    /// Base class for data models.
+    /// </summary>
+    public abstract class Model
+    {
+        // The value that uniquely identifies this object.
+        [JsonProperty(PropertyName = "id")]
+        public string Id { get; set; }
+    }
+}

Tailspin.SpaceGame.Web/Models/Profile.cs

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+using Newtonsoft.Json;
+
+namespace TailSpin.SpaceGame.Web.Models
+{
+    public class Profile : Model
+    {
+        // The player's user name.
+        [JsonProperty(PropertyName = "userName")]
+        public string UserName { get; set; }
+
+        // The URL of the player's avatar image.
+        [JsonProperty(PropertyName = "avatarUrl")]
+        public string AvatarUrl { get; set; }
+
+        // The achievements the player earned.
+        [JsonProperty(PropertyName = "achievements")]
+        public string[] Achievements { get; set; }
+    }
+}

Tailspin.SpaceGame.Web/Models/ProfileViewModel.cs

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+namespace TailSpin.SpaceGame.Web.Models
+{
+    public class ProfileViewModel
+    {
+        // The player profile.
+        public Profile Profile;
+        // The player's rank according to the active filter.
+        public string Rank;
+    }
+}