using System;
using System.Collections.Generic;
using System.Net;
using System.Reactive.Linq;
using System.Threading.Tasks;
using NSubstitute;
using Octokit.Internal;
using Octokit.Reactive;
using Xunit;

using static Octokit.Internal.TestSetup;

namespace Octokit.Tests.Reactive
{
    public class ObservableIssueTimelineClientTests
    {
        public class TheCtor
        {
            [Fact]
            public void EnsuresNonNullArguments()
            {
                Assert.Throws<ArgumentNullException>(
                    () => new ObservableIssueTimelineClient(null));
            }
        }

        public class TheGetAllForIssueMethod
        {
            [Fact]
            public async Task RequestsCorrectUrl()
            {
                var result = new List<TimelineEventInfo> { new TimelineEventInfo() };

                var connection = Substitute.For<IConnection>();
                var gitHubClient = new GitHubClient(connection);
                var client = new ObservableIssueTimelineClient(gitHubClient);

                IApiResponse<List<TimelineEventInfo>> response = new ApiResponse<List<TimelineEventInfo>>(
                    CreateResponse(HttpStatusCode.OK),
                    result);
                gitHubClient.Connection.Get<List<TimelineEventInfo>>(Args.Uri, Args.EmptyDictionary)
                    .Returns(Task.FromResult(response));

                var timelineEvents = await client.GetAllForIssue("fake", "repo", 42).ToList();

                connection.Received().Get<List<TimelineEventInfo>>(
                    Arg.Is<Uri>(u => u.ToString() == "repos/fake/repo/issues/42/timeline"),
                    Arg.Any<Dictionary<string, string>>());
                Assert.Single(timelineEvents);
            }

            [Fact]
            public async Task RequestsCorrectUrlWithApiOptions()
            {
                var result = new List<TimelineEventInfo> { new TimelineEventInfo() };

                var connection = Substitute.For<IConnection>();
                var gitHubClient = new GitHubClient(connection);
                var client = new ObservableIssueTimelineClient(gitHubClient);

                IApiResponse<List<TimelineEventInfo>> response = new ApiResponse<List<TimelineEventInfo>>(CreateResponse(HttpStatusCode.OK), result);
                gitHubClient.Connection.Get<List<TimelineEventInfo>>(Args.Uri, Arg.Is<Dictionary<string, string>>(d => d.Count == 1))
                    .Returns(Task.FromResult(response));

                var timelineEvents = await client.GetAllForIssue("fake", "repo", 42, new ApiOptions { PageSize = 30 }).ToList();

                connection.Received().Get<List<TimelineEventInfo>>(
                    Arg.Is<Uri>(u => u.ToString() == "repos/fake/repo/issues/42/timeline"),
                    Arg.Is<Dictionary<string, string>>(d => d.Count == 1 && d["per_page"] == "30"));
                Assert.Single(timelineEvents);
            }

            [Fact]
            public async Task RequestCorrectUrlWithRepositoryId()
            {
                var result = new List<TimelineEventInfo> { new TimelineEventInfo() };
                var connection = Substitute.For<IConnection>();
                var githubClient = new GitHubClient(connection);
                var client = new ObservableIssueTimelineClient(githubClient);

                IApiResponse<List<TimelineEventInfo>> response = new ApiResponse<List<TimelineEventInfo>>(CreateResponse(HttpStatusCode.OK), result);
                githubClient.Connection.Get<List<TimelineEventInfo>>(Args.Uri, Args.EmptyDictionary)
                    .Returns(Task.FromResult(response));

                var timelineEvents = await client.GetAllForIssue(1, 42).ToList();

                connection.Received().Get<List<TimelineEventInfo>>(
                    Arg.Is<Uri>(u => u.ToString() == "repositories/1/issues/42/timeline"),
                    Arg.Any<Dictionary<string, string>>());
                Assert.Single(timelineEvents);
            }

            [Fact]
            public async Task RequestCorrectUrlWithRepositoryIdAndApiOptions()
            {
                var result = new List<TimelineEventInfo> { new TimelineEventInfo() };
                var connection = Substitute.For<IConnection>();
                var githubClient = new GitHubClient(connection);
                var client = new ObservableIssueTimelineClient(githubClient);

                IApiResponse<List<TimelineEventInfo>> response = new ApiResponse<List<TimelineEventInfo>>(CreateResponse(HttpStatusCode.OK), result);
                githubClient.Connection.Get<List<TimelineEventInfo>>(Args.Uri, Arg.Is<Dictionary<string, string>>(d => d.Count == 1))
                    .Returns(Task.FromResult(response));

                var timelineEvents = await client.GetAllForIssue(1, 42, new ApiOptions { PageSize = 30 }).ToList();

                connection.Received().Get<List<TimelineEventInfo>>(
                    Arg.Is<Uri>(u => u.ToString() == "repositories/1/issues/42/timeline"),
                    Arg.Is<Dictionary<string, string>>(d => d.Count == 1 && d["per_page"] == "30"));
                Assert.Single(timelineEvents);
            }

            [Fact]
            public async Task EnsuresNonNullArguments()
            {
                var client = new ObservableIssueTimelineClient(Substitute.For<IGitHubClient>());

                Assert.Throws<ArgumentNullException>(() => client.GetAllForIssue(null, "repo", 42));
                Assert.Throws<ArgumentNullException>(() => client.GetAllForIssue("owner", null, 42));
                Assert.Throws<ArgumentNullException>(() => client.GetAllForIssue("owner", "repo", 42, null));
                Assert.Throws<ArgumentNullException>(() => client.GetAllForIssue(1, 42, null));

                Assert.Throws<ArgumentException>(() => client.GetAllForIssue("", "repo", 42));
                Assert.Throws<ArgumentException>(() => client.GetAllForIssue("owner", "", 42));
            }
        }
    }
}