Implemented Several Features & Bug Fixes

- Fixed Jessicaward#76, Jessicaward#73, Jessicaward#70
- Implemented Jessicaward#75, Jessicaward#74, Jessicaward#72, Jessicaward#71, Jessicaward#69

SpotNetCore/SpotNetCore/Endpoints/AlbumEndpoint.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Threading.Tasks;
+using SpotNetCore.Models;
+
+namespace SpotNetCore.Endpoints
+{
+    public class AlbumEndpoint
+    {
+        private HttpClient _httpClient;
+
+        internal AlbumEndpoint(HttpClient httpClient)
+        {
+            _httpClient = httpClient;
+        }
+
+        public async Task<IEnumerable<SpotifyTrack>> GetAlbumTracks(String albumId)
+        {
+            return await _httpClient.GetFromSpotifyJsonAsync<IEnumerable<SpotifyTrack>>($"/v1/albums/{albumId}/tracks");
+        }
+
+        public async Task<IEnumerable<SpotifyTrack>> GetAlbumTracks(SpotifyAlbum album)
+        {
+            return await GetAlbumTracks(album.Id);
+        }
+    }
+}

SpotNetCore/SpotNetCore/Endpoints/ArtistEndpoint.cs

@@ -0,0 +1,27 @@
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Threading.Tasks;
+using SpotNetCore.Models;
+
+namespace SpotNetCore.Endpoints
+{
+    public class ArtistEndpoint
+    {
+        private HttpClient _httpClient;
+
+        public ArtistEndpoint(HttpClient httpClient)
+        {
+            _httpClient = httpClient;
+        }
+
+        public async Task<IEnumerable<SpotifyTrack>> GetArtistTopTracks(string artistId)
+        {
+            return await _httpClient.GetFromSpotifyJsonAsync<IEnumerable<SpotifyTrack>>($"/v1/artists/{artistId}/top-tracks");
+        }
+
+        public async Task<IEnumerable<SpotifyAlbum>> GetArtistAlbums(string artistId)
+        {
+            return await _httpClient.GetFromSpotifyJsonAsync<IEnumerable<SpotifyAlbum>>($"/v1/artists/{artistId}/albums?include_groups=album");
+        }
+    }
+}

SpotNetCore/SpotNetCore/Endpoints/PlayerEndpoint.cs

@@ -0,0 +1,63 @@
+using System.Net.Http;
+using System.Threading.Tasks;
+using SpotNetCore.Models;
+
+namespace SpotNetCore.Endpoints
+{
+    public class PlayerEndpoint
+    {
+        private readonly HttpClient _httpClient;
+
+        internal PlayerEndpoint(HttpClient httpClient)
+        {
+            _httpClient = httpClient;
+        }
+
+        public async Task<HttpResponseMessage> Play()
+        {
+            var response = await _httpClient.PutAsync("/v1/me/player/play", null);
+            return response;
+        }
+
+        public async Task<HttpResponseMessage> Pause()
+        {
+            var response = await _httpClient.PutAsync("/v1/me/player/pause", null);
+            return response;
+        }
+
+        public async Task<HttpResponseMessage> Next()
+        {
+            var response = await _httpClient.PostAsync("/v1/me/player/next", null);
+            return response;
+        }
+
+        public async Task<HttpResponseMessage> Previous()
+        {
+            var response = await _httpClient.PostAsync("/v1/me/player/previous", null);
+            return response;
+        }
+
+        public async Task<HttpResponseMessage> Seek(int milliseconds)
+        {
+            var response = await _httpClient.PutAsync($"/v1/me/player/seek?position_ms={milliseconds}", null);
+            return response;
+        }
+
+        public async Task<HttpResponseMessage> Shuffle(bool state)
+        {
+            var response = await _httpClient.PutAsync($"/v1/me/player/shuffle?state={state}", null);
+            return response;
+        }
+
+        public async Task<HttpResponseMessage> Queue(string trackUri)
+        {
+            var response = await _httpClient.PostAsync($"/v1/me/player/queue?uri={trackUri}", null);
+            return response;
+        }
+
+        public async Task<SpotifyPlayerContext> Player()
+        {
+            return await _httpClient.GetFromSpotifyJsonAsync<SpotifyPlayerContext>("/v1/me/player");
+        }
+    }
+}

SpotNetCore/SpotNetCore/Endpoints/PlaylistEndpoint.cs

@@ -0,0 +1,22 @@
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Threading.Tasks;
+using SpotNetCore.Models;
+
+namespace SpotNetCore.Endpoints
+{
+    public class PlaylistEndpoint
+    {
+        private HttpClient _httpClient;
+
+        public PlaylistEndpoint(HttpClient httpClient)
+        {
+            _httpClient = httpClient;
+        }
+
+        public Task<IEnumerable<SpotifyPlaylistTrack>> GetPlaylistTracks(string playlistId)
+        {
+            return _httpClient.GetFromSpotifyJsonAsync<IEnumerable<SpotifyPlaylistTrack>>($"/v1/playlists/{playlistId}/tracks");
+        }
+    }
+}

SpotNetCore/SpotNetCore/Endpoints/SearchEndpoint.cs

@@ -0,0 +1,46 @@
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Threading.Tasks;
+using SpotNetCore.Models;
+
+namespace SpotNetCore.Endpoints
+{
+    public class SearchEndpoint
+    {
+        private HttpClient _httpClient;
+
+        public SearchEndpoint(HttpClient httpClient)
+        {
+            _httpClient = httpClient;
+        }
+
+        private async Task<SpotifySearchResult> Search(string query, string type, int limit = 10, int offset = 0)
+        {
+            return await _httpClient.GetFromSpotifyJsonAsync<SpotifySearchResult>($"/v1/search?q={query}&type={type}&limit={limit}&offset={offset}");
+        }
+
+        public async Task<IEnumerable<SpotifyTrack>> SearchTracks(string query, int limit = 10, int offset = 0)
+        {
+            var data = await Search(query, "track", limit, offset);
+            return data.Tracks.Items;
+        } 
+
+        public async Task<IEnumerable<SpotifyAlbum>> SearchAlbums(string query, int limit = 10, int offset = 0)
+        {
+            var data = await Search(query, "album", limit, offset);
+            return data.Albums.Items;
+        } 
+
+        public async Task<IEnumerable<SpotifyPlaylist>> SearchPlaylists(string query, int limit = 10, int offset = 0)
+        {
+            var data = await Search(query, "playlist", limit, offset);
+            return data.Playlists.Items;
+        } 
+
+        public async Task<IEnumerable<SpotifyArtist>> SearchArtists(string query, int limit = 10, int offset = 0)
+        {
+            var data = await Search(query, "artist", limit, offset);
+            return data.Artists.Items;
+        } 
+    }
+}

SpotNetCore/SpotNetCore/Implementation/AppConstants.cs

@@ -0,0 +1,37 @@
+namespace SpotNetCore.Implementation
+{
+    public class AppConstants
+    {
+        public static readonly int CallbackPort = 5000;
+        public static readonly string Prompt = "Spotify> ";
+        public static readonly string SuccessHtml = @"
+            <html style='font-family: sans-serif;'>
+                <head><title>SpotNetCore - Spotify | Authentication Succeed</title></head>
+                <body style='text-align: center;'>
+                    <header>
+                        <h1>SpotNetCore</h1>
+                    </header>
+                    <main style='border: 1px solid lightgrey; margin: auto; width: 600px; padding-bottom: 15px;'>
+                        <h2 style='color: limegreen;'>Authentication complete</h2>
+                        <div>You can return to the application. Feel free to close this browser tab.</div>
+                    </main>
+                </body>
+            </html>";
+
+        public static readonly string ErrorHtml = @"
+            <html style='font-family: sans-serif;'>
+                <head><title>SpotNetCore - Spotify | Authentication Failed</title></head>
+                <body style='text-align: center;'>
+                    <header>
+                        <h1>SpotNetCore</h1>
+                    </header>
+                    <main style='border: 1px solid lightgrey; margin: auto; width: 600px; padding-bottom: 15px;'>
+                        <h2 style='color: salmon;'>Authentication failed</h2>
+                        <div><b>Error details:</b> error {0} error_description: {1}</div>
+                        <br>
+                        <div>You can return to the application. Feel free to close this browser tab.</div>
+                    </main>
+                </body>
+            </html>";
+    }
+}