using ECMJobRunner.Application.Common.Constants;
using ECMJobRunner.Application.Common.Dtos;
using ECMJobRunner.Application.Common.Exceptions;
using ECMJobRunner.Application.Common.Interfaces;
using ECMJobRunner.Application.Common.Options;
using ECMJobRunner.Application.DEXJob.Commands;
using ECMJobRunner.Application.DEXJob.Commands.Behaviors;
using ECMJobRunner.Domain.Entities;
using FluentAssertions;
using MediatR;
using Microsoft.Extensions.Options;
using Moq;
using System;
using System.Threading;
using System.Threading.Tasks;
using Xunit;

namespace ECMJobRunner.Tests.Application
{
    public class MainQueryExecutionBehaviorTests
    {
        private readonly Mock<ISQLExecutor> _mockExecutor;
        private readonly Mock<IOptions<DexJobOptions>> _mockOptions;
        private readonly MainQueryExecutionBehavior<TriggeringDEXJobCommand, Unit> _behavior;
        private readonly Mock<RequestHandlerDelegate<Unit>> _mockNext;

        public MainQueryExecutionBehaviorTests()
        {
            _mockExecutor = new Mock<ISQLExecutor>();
            _mockOptions = new Mock<IOptions<DexJobOptions>>();
            _mockOptions.Setup(o => o.Value).Returns(new DexJobOptions());
            _behavior = new MainQueryExecutionBehavior<TriggeringDEXJobCommand, Unit>(_mockExecutor.Object, _mockOptions.Object);
            _mockNext = new Mock<RequestHandlerDelegate<Unit>>();
            _mockNext.Setup(n => n()).ReturnsAsync(Unit.Value);
        }

        [Fact]
        public async Task Handle_WithValidMainQuery_ExecutesSuccessfully()
        {
            // Arrange
            var command = new TriggeringDEXJobCommand
            {
                Job = new ProfileSqlJob { SqlMainQuery = "INSERT INTO Table VALUES (1)" },
                BatchId = "20260711143025123456"
            };

            _mockExecutor
                .Setup(e => e.ExecuteQueryAsync<MainQueryResult>(It.IsAny<string>(), It.IsAny<CancellationToken>()))
                .ReturnsAsync(new MainQueryResult { ReturnValue = null });

            // Act
#if NET48
            var result = await _behavior.Handle(command, CancellationToken.None, _mockNext.Object);
#else
            var result = await _behavior.Handle(command, _mockNext.Object, CancellationToken.None);
#endif

            // Assert
            result.Should().Be(Unit.Value);
            _mockExecutor.Verify(e => e.ExecuteQueryAsync<MainQueryResult>(It.IsAny<string>(), It.IsAny<CancellationToken>()), Times.Once);
            _mockNext.Verify(n => n(), Times.Once);
        }

        [Fact]
        public async Task Handle_WithNullReturnValue_DoesNotThrow()
        {
            // Arrange
            var command = new TriggeringDEXJobCommand
            {
                Job = new ProfileSqlJob { SqlMainQuery = "INSERT INTO Table VALUES (1)" },
                BatchId = "20260711143025123456"
            };

            _mockExecutor
                .Setup(e => e.ExecuteQueryAsync<MainQueryResult>(It.IsAny<string>(), It.IsAny<CancellationToken>()))
                .ReturnsAsync(new MainQueryResult { ReturnValue = null });

            // Act
#if NET48
            Func<Task> act = async () => await _behavior.Handle(command, CancellationToken.None, _mockNext.Object);
#else
            Func<Task> act = async () => await _behavior.Handle(command, _mockNext.Object, CancellationToken.None);
#endif

            // Assert
            await act.Should().NotThrowAsync();
        }

        [Fact]
        public async Task Handle_WithNonNullReturnValue_ThrowsDEXJobException()
        {
            // Arrange
            var command = new TriggeringDEXJobCommand
            {
                Job = new ProfileSqlJob { SqlMainQuery = "INSERT INTO Table VALUES (1)" },
                BatchId = "20260711143025123456"
            };

            _mockExecutor
                .Setup(e => e.ExecuteQueryAsync<MainQueryResult>(It.IsAny<string>(), It.IsAny<CancellationToken>()))
                .ReturnsAsync(new MainQueryResult { ReturnValue = 1 });

            // Act
#if NET48
            Func<Task> act = async () => await _behavior.Handle(command, CancellationToken.None, _mockNext.Object);
#else
            Func<Task> act = async () => await _behavior.Handle(command, _mockNext.Object, CancellationToken.None);
#endif

            // Assert
            await act.Should().ThrowAsync<JobException>()
                .WithMessage("*unexpectedly returned the value 1*");
        }

        [Fact]
        public async Task Handle_WithNullMainQuery_IgnoresByDefault()
        {
            // Arrange
            var command = new TriggeringDEXJobCommand
            {
                Job = new ProfileSqlJob { SqlMainQuery = null },
                BatchId = "20260711143025123456"
            };

            // Act
#if NET48
            var result = await _behavior.Handle(command, CancellationToken.None, _mockNext.Object);
#else
            var result = await _behavior.Handle(command, _mockNext.Object, CancellationToken.None);
#endif

            // Assert
            result.Should().Be(Unit.Value);
            _mockExecutor.Verify(e => e.ExecuteQueryAsync<MainQueryResult>(It.IsAny<string>(), It.IsAny<CancellationToken>()), Times.Never);
            _mockNext.Verify(n => n(), Times.Once);
        }

        [Fact]
        public async Task Handle_WithNullMainQueryAndStopOption_ThrowsDEXJobException()
        {
            // Arrange
            var options = new DexJobOptions
            {
                Error = new DexJobOptions.DexJobErrorHandlingOptions
                {
                    MainQuery = new DexJobOptions.DexJobErrorHandlingOptions.SqlQueryErrorHandlingOptions
                    {
                        IfNullOrWhiteSpace = ErrorAction.Stop
                    }
                }
            };
            _mockOptions.Setup(o => o.Value).Returns(options);

            var behavior = new MainQueryExecutionBehavior<TriggeringDEXJobCommand, Unit>(_mockExecutor.Object, _mockOptions.Object);
            var command = new TriggeringDEXJobCommand
            {
                Job = new ProfileSqlJob { SqlMainQuery = null },
                BatchId = "20260711143025123456"
            };

            // Act
#if NET48
            Func<Task> act = async () => await behavior.Handle(command, CancellationToken.None, _mockNext.Object);
#else
            Func<Task> act = async () => await behavior.Handle(command, _mockNext.Object, CancellationToken.None);
#endif

            // Assert
            await act.Should().ThrowAsync<JobException>()
                .WithMessage("*SQL Main Query is null or empty*");
        }

        [Fact]
        public async Task Handle_WithBatchIdPlaceholder_ReplacesCorrectly()
        {
            // Arrange
            var batchId = "20260711143025123456";
            var command = new TriggeringDEXJobCommand
            {
                Job = new ProfileSqlJob { SqlMainQuery = "INSERT INTO Table (BatchId) VALUES ('#INT#BATCH_ID')" },
                BatchId = batchId
            };

            string? capturedSql = null;
            _mockExecutor
                .Setup(e => e.ExecuteQueryAsync<MainQueryResult>(It.IsAny<string>(), It.IsAny<CancellationToken>()))
                .Callback<string, CancellationToken>((sql, _) => capturedSql = sql)
                .ReturnsAsync(new MainQueryResult { ReturnValue = null });

            // Act
#if NET48
            await _behavior.Handle(command, CancellationToken.None, _mockNext.Object);
#else
            await _behavior.Handle(command, _mockNext.Object, CancellationToken.None);
#endif

            // Assert
            capturedSql.Should().Contain(batchId);
            capturedSql.Should().NotContain("#INT#BATCH_ID");
        }

        [Fact]
        public async Task Handle_WithExecutionError_ThrowsDEXJobException()
        {
            // Arrange
            var command = new TriggeringDEXJobCommand
            {
                Job = new ProfileSqlJob { SqlMainQuery = "INVALID SQL" },
                BatchId = "20260711143025123456"
            };

            _mockExecutor
                .Setup(e => e.ExecuteQueryAsync<MainQueryResult>(It.IsAny<string>(), It.IsAny<CancellationToken>()))
                .ThrowsAsync(new InvalidOperationException("SQL error"));

            // Act
#if NET48
            Func<Task> act = async () => await _behavior.Handle(command, CancellationToken.None, _mockNext.Object);
#else
            Func<Task> act = async () => await _behavior.Handle(command, _mockNext.Object, CancellationToken.None);
#endif

            // Assert
            await act.Should().ThrowAsync<JobException>()
                .WithMessage("*SQL Main Query*");
        }

        [Fact]
        public async Task Handle_WithNonDEXJobCommand_SkipsExecution()
        {
            // Arrange
            var otherCommand = new OtherCommand();
            var behavior = new MainQueryExecutionBehavior<OtherCommand, Unit>(_mockExecutor.Object, _mockOptions.Object);
            var mockNext = new Mock<RequestHandlerDelegate<Unit>>();
            mockNext.Setup(n => n()).ReturnsAsync(Unit.Value);

            // Act
#if NET48
            var result = await behavior.Handle(otherCommand, CancellationToken.None, mockNext.Object);
#else
            var result = await behavior.Handle(otherCommand, mockNext.Object, CancellationToken.None);
#endif

            // Assert
            result.Should().Be(Unit.Value);
            _mockExecutor.Verify(e => e.ExecuteQueryAsync<MainQueryResult>(It.IsAny<string>(), It.IsAny<CancellationToken>()), Times.Never);
            mockNext.Verify(n => n(), Times.Once);
        }

        private class OtherCommand : IRequest<Unit> { }
    }
}