using System;
using System.IO;
using System.Threading;
using Google;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Calendar.v3;
using Google.Apis.Calendar.v3.Data;
using Google.Apis.Services;

public class CalendarApiTest
{
    public static async Task GetLatestEventAsync(string calendarId, string credentialsFilePath)
    {
        try
        {
            CalendarService service = getCalendarService(credentialsFilePath);

            // イベントリストのリクエストを作成
            var request = service.Events.List(calendarId);
            request.TimeMin = DateTime.UtcNow;
            request.ShowDeleted = false;
            request.SingleEvents = true;
            request.MaxResults = 10;
            request.OrderBy = EventsResource.ListRequest.OrderByEnum.StartTime;

            // イベントリストのリクエストを実行
            var events = await request.ExecuteAsync();

            if (events.Items != null && events.Items.Count > 0)
            {
                Console.WriteLine("最新の予定:");
                foreach (var eventItem in events.Items)
                {
                    var when = eventItem.Start.DateTime.ToString() ?? eventItem.Start.Date;
                    Console.WriteLine($"{eventItem.Summary} ({when})");
                }
            }
            else
            {
                Console.WriteLine("近日中の予定はありません。");
            }
        }
        catch (GoogleApiException ex)
        {
            Console.WriteLine($"Error: {ex.Message}");
            Console.WriteLine($"HttpStatusCode: {ex.HttpStatusCode}");
            Console.WriteLine($"ErrorDetails: {ex.Error}");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error: {ex.Message}");
        }
    }

    public static CalendarService getCalendarService(string credentialsFilePath)
    {
        // サービスアカウントの認証情報を読み込む
        GoogleCredential credential;
        using (var stream = new FileStream(credentialsFilePath, FileMode.Open, FileAccess.Read))
        {
            credential = GoogleCredential.FromStream(stream).CreateScoped(CalendarService.Scope.CalendarReadonly);
        }

        // GoogleカレンダーAPIのサービスを作成
        var service = new CalendarService(new BaseClientService.Initializer
        {
            HttpClientInitializer = credential,
            ApplicationName = "VQCalendarAttention",
        });
        return service;
    }
}