using Elsa.Common;
using Elsa.Scheduling;
using Elsa.Scheduling.Activities;
using Elsa.Scheduling.Bookmarks;
using Elsa.Testing.Shared;
using Elsa.Workflows;
using Microsoft.Extensions.DependencyInjection;
using NSubstitute;

namespace Elsa.Activities.UnitTests.Scheduling;

public class DelayTests
{
    [Theory]
    [InlineData(1, 0, 0)]    // 1 hour
    [InlineData(0, 30, 0)]   // 30 minutes
    [InlineData(0, 0, 45)]   // 45 seconds
    [InlineData(24, 0, 0)]   // 1 day
    public async Task CreatesBookmark_WithCorrectResumeTime(int hours, int minutes, int seconds)
    {
        // Arrange
        var now = new DateTimeOffset(2025, 1, 6, 12, 0, 0, TimeSpan.Zero);
        var delay = new TimeSpan(hours, minutes, seconds);
        var expectedResumeAt = now.Add(delay);
        var clock = CreateClock(now);

        var activity = new Delay(delay);

        // Act
        var context = await ExecuteAsync(activity, clock);

        // Assert
        Assert.Equal(ActivityStatus.Running, context.Status);
        var payload = GetDelayPayload(context);
        Assert.Equal(expectedResumeAt, payload.ResumeAt);
    }

    [Theory]
    [MemberData(nameof(FactoryMethodTestCases))]
    public async Task FactoryMethods_CreateCorrectTimeSpans(Delay activity, TimeSpan expected)
    {
        // Arrange
        var now = new DateTimeOffset(2025, 1, 6, 12, 0, 0, TimeSpan.Zero);
        var clock = CreateClock(now);

        // Act
        var context = await ExecuteAsync(activity, clock);

        // Assert
        var payload = GetDelayPayload(context);
        Assert.Equal(now.Add(expected), payload.ResumeAt);
    }

    public static TheoryData<Delay, TimeSpan> FactoryMethodTestCases() => new()
    {
        { Delay.FromSeconds(30), TimeSpan.FromSeconds(30) },
        { Delay.FromMinutes(5), TimeSpan.FromMinutes(5) },
        { Delay.FromHours(2), TimeSpan.FromHours(2) },
        { Delay.FromDays(1), TimeSpan.FromDays(1) }
    };

    private static async Task<ActivityExecutionContext> ExecuteAsync(Delay activity, ISystemClock clock)
    {
        return await new ActivityTestFixture(activity)
            .ConfigureServices(services => services.AddSingleton(clock))
            .ExecuteAsync();
    }

    private static ISystemClock CreateClock(DateTimeOffset now)
    {
        var clock = Substitute.For<ISystemClock>();
        clock.UtcNow.Returns(now);
        return clock;
    }

    private static DelayPayload GetDelayPayload(ActivityExecutionContext context)
    {
        var bookmark = Assert.Single(context.WorkflowExecutionContext.Bookmarks);
        Assert.Equal(SchedulingStimulusNames.Delay, bookmark.Name);
        return Assert.IsType<DelayPayload>(bookmark.Payload);
    }
}