1 files changed, 146 insertions, 0 deletions
diff --git a/docker/crupest-api/CrupestApi/Services/TodoService.cs b/docker/crupest-api/CrupestApi/Services/TodoService.cs
new file mode 100644
index 0000000..eb4fef6
--- /dev/null
+++ b/docker/crupest-api/CrupestApi/Services/TodoService.cs
@@ -0,0 +1,146 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Net.Mime;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+using CrupestApi.Config;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+
+namespace CrupestApi.Services
+{
+    public class TodoItem
+    {
+        public string Status { get; set; } = default!;
+        public string Title { get; set; } = default!;
+        public bool Closed { get; set; }
+        public string color { get; set; } = default!;
+    }
+
+    public class TodoService
+    {
+        private readonly IOptionsSnapshot<TodoConfiguration> _options;
+        private readonly ILogger<TodoService> _logger;
+
+        public TodoService(IOptionsSnapshot<TodoConfiguration> options, ILogger<TodoService> logger)
+        {
+            _options = options;
+            _logger = logger;
+        }
+
+        private static string CreateGraphQLQuery(TodoConfiguration todoConfiguration)
+        {
+            return $$"""
+{
+    user(login: "{{todoConfiguration.Username}}") {
+        projectV2(number: {{todoConfiguration.ProjectNumber}}) {
+            items(last: {{todoConfiguration.Count}}) {
+                nodes {
+                    __typename
+                    content {
+                        __typename
+                        ... on Issue {
+                            title
+                            closed
+                        }
+                        ... on PullRequest {
+                            title
+                            closed
+                        }
+                        ... on DraftIssue {
+                            title
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+""";
+        }
+
+
+        public async Task<List<TodoItem>> GetTodosAsync()
+        {
+            var todoOptions = _options.Value;
+            if (todoOptions is null)
+            {
+                throw new Exception("Fail to get todos configuration.");
+            }
+
+            _logger.LogInformation("Username: {}; ProjectNumber: {}; Count: {}", todoOptions.Username, todoOptions.ProjectNumber, todoOptions.Count);
+            _logger.LogInformation("Getting todos from GitHub GraphQL API...");
+
+            using var httpClient = new HttpClient();
+
+            using var requestContent = new StringContent(JsonSerializer.Serialize(new
+            {
+                query = CreateGraphQLQuery(todoOptions)
+            }));
+            requestContent.Headers.ContentType = new MediaTypeHeaderValue(MediaTypeNames.Application.Json, Encoding.UTF8.WebName);
+
+            using var request = new HttpRequestMessage(HttpMethod.Post, "https://api.github.com/graphql");
+            request.Content = requestContent;
+            request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", todoOptions.Token);
+            request.Headers.TryAddWithoutValidation("User-Agent", todoOptions.Username);
+
+            using var response = await httpClient.SendAsync(request);
+            var responseBody = await response.Content.ReadAsStringAsync();
+
+            _logger.LogInformation("GitHub server returned status code: {}", response.StatusCode);
+            _logger.LogInformation("GitHub server returned body: {}", responseBody);
+
+            if (response.IsSuccessStatusCode)
+            {
+                using var responseJson = JsonSerializer.Deserialize<JsonDocument>(responseBody);
+                if (responseJson is null)
+                {
+                    throw new Exception("Fail to deserialize response body.");
+                }
+
+                var nodes = responseJson.RootElement.GetProperty("data").GetProperty("user").GetProperty("projectV2").GetProperty("items").GetProperty("nodes").EnumerateArray();
+
+                var result = new List<TodoItem>();
+
+                foreach (var node in nodes)
+                {
+                    var content = node.GetProperty("content");
+                    var title = content.GetProperty("title").GetString();
+                    if (title is null)
+                    {
+                        throw new Exception("Fail to get title.");
+                    }
+                    JsonElement closedElement;
+                    bool closed;
+                    if (content.TryGetProperty("closed", out closedElement))
+                    {
+                        closed = closedElement.GetBoolean();
+                    }
+                    else
+                    {
+                        closed = false;
+                    }
+
+                    result.Add(new TodoItem
+                    {
+                        Title = title,
+                        Status = closed ? "Done" : "Todo",
+                        Closed = closed,
+                        color = closed ? "green" : "blue"
+                    });
+                }
+
+                return result;
+            }
+            else
+            {
+                const string message = "Fail to get todos from GitHub.";
+                _logger.LogError(message);
+                throw new Exception(message);
+            }
+        }
+    }
+}
+\ No newline at end of file