using ECMJobRunner.Application.Common.Dtos;
using ECMJobRunner.Application.Common.Interfaces;
using ECMJobRunner.Application.Common.Options;
using ECMJobRunner.Application.DEXJob.Commands;
using ECMJobRunner.Domain.Entities;
using ECMJobRunner.Domain.Interfaces;
using FluentAssertions;
using MediatR;
using Microsoft.Extensions.Options;
using Moq;
using ReC.Client;
using ReC.Client.Api;
using System;
using System.Linq.Expressions;
using System.Threading;
using System.Threading.Tasks;
using Xunit;

namespace ECMJobRunner.Tests.Application
{
    public class TriggeringDEXJobBatchCommandTests
    {
        private readonly Mock<IProfileSqlJobRepository> _mockJobRepo;
        private readonly Mock<ISender> _mockSender;
        private readonly TriggeringDEXJobBatchCommandHandler _handler;

        public TriggeringDEXJobBatchCommandTests()
        {
            _mockJobRepo = new Mock<IProfileSqlJobRepository>();
            _mockSender = new Mock<ISender>();
            _handler = new TriggeringDEXJobBatchCommandHandler(_mockJobRepo.Object, _mockSender.Object);
        }

        [Fact]
        public async Task Handle_WithValidProfileId_ExecutesAllJobs()
        {
            // Arrange
            var profileId = 123;
            var jobs = new[]
            {
                new ProfileSqlJob { Id = 1, ProfileId = profileId, SqlMainQuery = "SELECT 1", SqlCheckQuery = "SELECT 2" },
                new ProfileSqlJob { Id = 2, ProfileId = profileId, SqlMainQuery = "SELECT 3", SqlCheckQuery = "SELECT 4" }
            };

            _mockJobRepo
                .Setup(r => r.FindAsync(It.IsAny<Expression<Func<ProfileSqlJob, bool>>>(), It.IsAny<CancellationToken>()))
                .ReturnsAsync(jobs);

            var command = new TriggeringProfileJobBatchCommand { ProfileId = profileId };

            // Act
            var result = await _handler.Handle(command, CancellationToken.None);

            // Assert
            result.Should().Be(Unit.Value);
            _mockSender.Verify(
                s => s.Send(It.IsAny<TriggeringProfileJobCommand>(), It.IsAny<CancellationToken>()),
                Times.Exactly(2),
                "Should send command for each job");
        }

        [Fact]
        public async Task Handle_WithNoJobs_CompletesWithoutError()
        {
            // Arrange
            var profileId = 999;
            _mockJobRepo
                .Setup(r => r.FindAsync(It.IsAny<Expression<Func<ProfileSqlJob, bool>>>(), It.IsAny<CancellationToken>()))
                .ReturnsAsync(Array.Empty<ProfileSqlJob>());

            var command = new TriggeringProfileJobBatchCommand { ProfileId = profileId };

            // Act
            var result = await _handler.Handle(command, CancellationToken.None);

            // Assert
            result.Should().Be(Unit.Value);
            _mockSender.Verify(
                s => s.Send(It.IsAny<TriggeringProfileJobCommand>(), It.IsAny<CancellationToken>()),
                Times.Never,
                "Should not send any commands when no jobs found");
        }

        [Fact]
        public void CreateBatchId_ReturnsValidFormat()
        {
            // Act
            var batchId = TriggeringDEXJobBatchCommandHandler.CreateBatchId();

            // Assert
            batchId.Should().NotBeNullOrEmpty();
            batchId.Should().HaveLength(20, "BatchId should be exactly 20 characters");
            batchId.Should().MatchRegex(@"^\d{20}$", "BatchId should contain only digits");
        }

        [Fact]
        public void CreateBatchId_GeneratesUniqueBatchIds()
        {
            // Act
            var batchId1 = TriggeringDEXJobBatchCommandHandler.CreateBatchId();
            var batchId2 = TriggeringDEXJobBatchCommandHandler.CreateBatchId();

            // Assert
            batchId1.Should().NotBe(batchId2, "Consecutive batch IDs should be different");
        }

        [Fact]
        public async Task Handle_PassesBatchIdToCommands()
        {
            // Arrange
            var profileId = 123;
            var job = new ProfileSqlJob { Id = 1, ProfileId = profileId, SqlMainQuery = "SELECT 1" };

            _mockJobRepo
                .Setup(r => r.FindAsync(It.IsAny<Expression<Func<ProfileSqlJob, bool>>>(), It.IsAny<CancellationToken>()))
                .ReturnsAsync(new[] { job });

            TriggeringProfileJobCommand? capturedCommand = null;
            _mockSender
                .Setup(s => s.Send(It.IsAny<TriggeringProfileJobCommand>(), It.IsAny<CancellationToken>()))
                .Callback<IRequest<Unit>, CancellationToken>((cmd, _) => capturedCommand = cmd as TriggeringProfileJobCommand)
                .ReturnsAsync(Unit.Value);

            var command = new TriggeringProfileJobBatchCommand { ProfileId = profileId };

            // Act
            await _handler.Handle(command, CancellationToken.None);

            // Assert
            capturedCommand.Should().NotBeNull();
            capturedCommand!.BatchId.Should().NotBeNullOrEmpty();
            capturedCommand.BatchId.Should().HaveLength(20);
            capturedCommand.Job.Should().Be(job);
        }
    }
}