using FluentAssertions;
using Microsoft.AspNetCore.Mvc;
using Moq;
using NUnit.Framework;
using Strata.ContinuousImprovement.Api.Controllers;
using Strata.ContinuousImprovement.Biz.StrategicOpportunities;
using Strata.ContinuousImprovement.Biz.StrategicOpportunities.Dtos;
using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Reflection;
using System.Threading;
using System.Threading.Tasks;

namespace Strata.ContinuousImprovement.Api.Test.Unit.Controllers
{
    [ExcludeFromCodeCoverage]
    [TestFixture, Category("Unit"), Category("Controller")]
    public class StrategicChargeCodeControllerTests
    {
        private StrategicChargeCodeController _controller;
        private Mock<IStrategicOpportunityService> _mockOpportunityService;
        private Mock<IStrategicChargeCodeOpportunityDetailService> _mockDetailService;

        [SetUp]
        public void SetUp()
        {
            _mockOpportunityService = new Mock<IStrategicOpportunityService>();
            _mockDetailService = new Mock<IStrategicChargeCodeOpportunityDetailService>();
            _controller = new StrategicChargeCodeController(_mockOpportunityService.Object, _mockDetailService.Object);
        }

        // --- GetOpportunityChargeCode ---

        [Test]
        public async Task GetOpportunityChargeCode_ReturnsOk_WhenFound()
        {
            const long opportunityId = 1;
            var data = new StrategicOpportunityChargeCodeEditData();
            _mockOpportunityService
                .Setup(s => s.GetStrategicOpportunityChargeCode(opportunityId, It.IsAny<CancellationToken>()))
                .ReturnsAsync(data);

            var result = await _controller.GetOpportunityChargeCode(opportunityId, CancellationToken.None);

            result.Result.Should().BeOfType<OkObjectResult>()
                .Which.Value.Should().Be(data);
        }

        [Test]
        public async Task GetOpportunityChargeCode_ReturnsNotFound_WhenMissing()
        {
            _mockOpportunityService
                .Setup(s => s.GetStrategicOpportunityChargeCode(It.IsAny<long>(), It.IsAny<CancellationToken>()))
                .ReturnsAsync((StrategicOpportunityChargeCodeEditData)null);

            var result = await _controller.GetOpportunityChargeCode(99, CancellationToken.None);

            result.Result.Should().BeOfType<NotFoundResult>();
        }

        // --- CreateOpportunityChargeCode ---

        [Test]
        public async Task CreateOpportunityChargeCode_ReturnsOk_WithNewId_WhenSuccessful()
        {
            const long newId = 42;
            var dto = new StrategicOpportunityChargeCodeDto();
            _mockOpportunityService
                .Setup(s => s.CreateOpportunityChargeCodeAsync(dto, It.IsAny<CancellationToken>()))
                .ReturnsAsync(newId);

            var result = await _controller.CreateOpportunityChargeCode(dto, CancellationToken.None);

            result.Result.Should().BeOfType<OkObjectResult>()
                .Which.Value.Should().Be(newId);
        }

        [Test]
        public async Task CreateOpportunityChargeCode_ReturnsBadRequest_WhenServiceReturnsZero()
        {
            _mockOpportunityService
                .Setup(s => s.CreateOpportunityChargeCodeAsync(It.IsAny<StrategicOpportunityChargeCodeDto>(), It.IsAny<CancellationToken>()))
                .ReturnsAsync(0L);

            var result = await _controller.CreateOpportunityChargeCode(new StrategicOpportunityChargeCodeDto(), CancellationToken.None);

            result.Result.Should().BeOfType<BadRequestResult>();
        }

        // --- UpdateOpportunityChargeCode ---

        [Test]
        public async Task UpdateOpportunityChargeCode_ReturnsOk_WhenSuccessful()
        {
            const long opportunityId = 5;
            _mockOpportunityService
                .Setup(s => s.UpdateOpportunityChargeCode(opportunityId, It.IsAny<StrategicOpportunityChargeCodeUpdateDto>(), It.IsAny<CancellationToken>()))
                .ReturnsAsync(opportunityId);

            var result = await _controller.UpdateOpportunityChargeCode(opportunityId, new StrategicOpportunityChargeCodeUpdateDto(), CancellationToken.None);

            result.Result.Should().BeOfType<OkObjectResult>();
        }

        [Test]
        public async Task UpdateOpportunityChargeCode_ReturnsNotFound_WhenServiceReturnsZero()
        {
            _mockOpportunityService
                .Setup(s => s.UpdateOpportunityChargeCode(It.IsAny<long>(), It.IsAny<StrategicOpportunityChargeCodeUpdateDto>(), It.IsAny<CancellationToken>()))
                .ReturnsAsync(0L);

            var result = await _controller.UpdateOpportunityChargeCode(99, new StrategicOpportunityChargeCodeUpdateDto(), CancellationToken.None);

            result.Result.Should().BeOfType<NotFoundResult>();
        }

        // --- DeleteOpportunityChargeCode ---

        [Test]
        public async Task DeleteOpportunityChargeCode_ReturnsNotFound_WhenOpportunityDoesNotExist()
        {
            _mockOpportunityService
                .Setup(s => s.ContainsAsync(It.IsAny<long>(), It.IsAny<CancellationToken>()))
                .ReturnsAsync(false);

            var result = await _controller.DeleteOpportunityChargeCode(99, CancellationToken.None);

            result.Should().BeOfType<NotFoundResult>();
            _mockOpportunityService.Verify(s => s.DeleteChargeCodeOpportunityAsync(It.IsAny<long>(), It.IsAny<CancellationToken>()), Times.Never);
        }

        [Test]
        public async Task DeleteOpportunityChargeCode_ReturnsNoContent_WhenDeleted()
        {
            const long opportunityId = 7;
            _mockOpportunityService.Setup(s => s.ContainsAsync(opportunityId, It.IsAny<CancellationToken>())).ReturnsAsync(true);
            _mockOpportunityService.Setup(s => s.DeleteChargeCodeOpportunityAsync(opportunityId, It.IsAny<CancellationToken>())).ReturnsAsync(true);

            var result = await _controller.DeleteOpportunityChargeCode(opportunityId, CancellationToken.None);

            result.Should().BeOfType<NoContentResult>();
        }

        [Test]
        public async Task DeleteOpportunityChargeCode_ReturnsBadRequest_WhenDeleteFails()
        {
            const long opportunityId = 7;
            _mockOpportunityService.Setup(s => s.ContainsAsync(opportunityId, It.IsAny<CancellationToken>())).ReturnsAsync(true);
            _mockOpportunityService.Setup(s => s.DeleteChargeCodeOpportunityAsync(opportunityId, It.IsAny<CancellationToken>())).ReturnsAsync(false);

            var result = await _controller.DeleteOpportunityChargeCode(opportunityId, CancellationToken.None);

            result.Should().BeOfType<BadRequestResult>();
        }

        // --- GetGoalDetail ---

        [Test]
        public async Task GetGoalDetail_ReturnsOk_WhenFound()
        {
            const long opportunityId = 3;
            var getData = new StrategicOpportunityGetDetailData();
            var data = new StrategicOpportunityDetailData();
            _mockDetailService
                .Setup(s => s.GetStrategicOpportunityDetailData(opportunityId, false, getData, It.IsAny<CancellationToken>()))
                .ReturnsAsync(data);

            var result = await _controller.GetGoalDetail(opportunityId, getData, CancellationToken.None);

            result.Result.Should().BeOfType<OkObjectResult>()
                .Which.Value.Should().Be(data);
        }

        [Test]
        public async Task GetGoalDetail_ReturnsNotFound_WhenMissing()
        {
            _mockDetailService
                .Setup(s => s.GetStrategicOpportunityDetailData(It.IsAny<long>(), false, It.IsAny<StrategicOpportunityGetDetailData>(), It.IsAny<CancellationToken>()))
                .ReturnsAsync((StrategicOpportunityDetailData)null);

            var result = await _controller.GetGoalDetail(99, new StrategicOpportunityGetDetailData(), CancellationToken.None);

            result.Result.Should().BeOfType<NotFoundResult>();
        }

        [Test]
        public async Task GetGoalDetail_PassesIsTrackingFalse_ToService()
        {
            const long opportunityId = 3;
            var getData = new StrategicOpportunityGetDetailData();
            _mockDetailService
                .Setup(s => s.GetStrategicOpportunityDetailData(opportunityId, false, getData, It.IsAny<CancellationToken>()))
                .ReturnsAsync(new StrategicOpportunityDetailData());

            await _controller.GetGoalDetail(opportunityId, getData, CancellationToken.None);

            _mockDetailService.Verify(s => s.GetStrategicOpportunityDetailData(opportunityId, false, getData, CancellationToken.None), Times.Once);
        }

        // --- GetTrackingDetail ---

        [Test]
        public async Task GetTrackingDetail_ReturnsOk_WhenFound()
        {
            const long opportunityId = 4;
            var getData = new StrategicOpportunityGetDetailData();
            var data = new StrategicOpportunityDetailData();
            _mockDetailService
                .Setup(s => s.GetStrategicOpportunityDetailData(opportunityId, true, getData, It.IsAny<CancellationToken>()))
                .ReturnsAsync(data);

            var result = await _controller.GetTrackingDetail(opportunityId, getData, CancellationToken.None);

            result.Result.Should().BeOfType<OkObjectResult>()
                .Which.Value.Should().Be(data);
        }

        [Test]
        public async Task GetTrackingDetail_ReturnsNotFound_WhenMissing()
        {
            _mockDetailService
                .Setup(s => s.GetStrategicOpportunityDetailData(It.IsAny<long>(), true, It.IsAny<StrategicOpportunityGetDetailData>(), It.IsAny<CancellationToken>()))
                .ReturnsAsync((StrategicOpportunityDetailData)null);

            var result = await _controller.GetTrackingDetail(99, new StrategicOpportunityGetDetailData(), CancellationToken.None);

            result.Result.Should().BeOfType<NotFoundResult>();
        }

        [Test]
        public async Task GetTrackingDetail_PassesIsTrackingTrue_ToService()
        {
            const long opportunityId = 4;
            var getData = new StrategicOpportunityGetDetailData();
            _mockDetailService
                .Setup(s => s.GetStrategicOpportunityDetailData(opportunityId, true, getData, It.IsAny<CancellationToken>()))
                .ReturnsAsync(new StrategicOpportunityDetailData());

            await _controller.GetTrackingDetail(opportunityId, getData, CancellationToken.None);

            _mockDetailService.Verify(s => s.GetStrategicOpportunityDetailData(opportunityId, true, getData, CancellationToken.None), Times.Once);
        }

        // --- UpdateDetails ---

        [Test]
        public async Task UpdateDetails_ReturnsBadRequest_WhenDtoIsNull()
        {
            var result = await _controller.UpdateDetails(1, null, CancellationToken.None);

            result.Should().BeOfType<BadRequestResult>();
            _mockDetailService.Verify(s => s.UpdateStrategicOpportunityDetailsData(
                It.IsAny<long>(), It.IsAny<IEnumerable<StrategicOpportunityChargeCodeAdjustment>>(), It.IsAny<IEnumerable<string>>(), It.IsAny<CancellationToken>()), Times.Never);
        }

        [Test]
        public async Task UpdateDetails_ReturnsBadRequest_WhenAdjustmentsIsEmpty()
        {
            var dto = new StrategicChargeCodeController.UpdateDetailsDto
            {
                Adjustments = new List<StrategicOpportunityChargeCodeAdjustment>(),
                Rows = new List<string> { "system", "entity" }
            };

            var result = await _controller.UpdateDetails(1, dto, CancellationToken.None);

            result.Should().BeOfType<BadRequestResult>();
            _mockDetailService.Verify(s => s.UpdateStrategicOpportunityDetailsData(
                It.IsAny<long>(), It.IsAny<IEnumerable<StrategicOpportunityChargeCodeAdjustment>>(), It.IsAny<IEnumerable<string>>(), It.IsAny<CancellationToken>()), Times.Never);
        }

        [Test]
        public async Task UpdateDetails_ReturnsBadRequest_WhenRowsIsEmpty()
        {
            var dto = new StrategicChargeCodeController.UpdateDetailsDto
            {
                Adjustments = new List<StrategicOpportunityChargeCodeAdjustment> { new() { NodeKey = "101", CostsValue = 5000m } },
                Rows = new List<string>()
            };

            var result = await _controller.UpdateDetails(1, dto, CancellationToken.None);

            result.Should().BeOfType<BadRequestResult>();
            _mockDetailService.Verify(s => s.UpdateStrategicOpportunityDetailsData(
                It.IsAny<long>(), It.IsAny<IEnumerable<StrategicOpportunityChargeCodeAdjustment>>(), It.IsAny<IEnumerable<string>>(), It.IsAny<CancellationToken>()), Times.Never);
        }

        [Test]
        public async Task UpdateDetails_ReturnsOk_AndCallsService_WhenDtoIsValid()
        {
            const long opportunityId = 42;
            var dto = new StrategicChargeCodeController.UpdateDetailsDto
            {
                Adjustments = new List<StrategicOpportunityChargeCodeAdjustment> { new() { NodeKey = "101", CostsValue = 5000m } },
                Rows = new List<string> { "system", "entity", "chargeCode" }
            };

            var result = await _controller.UpdateDetails(opportunityId, dto, CancellationToken.None);

            result.Should().BeOfType<OkResult>();
            _mockDetailService.Verify(s => s.UpdateStrategicOpportunityDetailsData(
                opportunityId, dto.Adjustments, dto.Rows, CancellationToken.None), Times.Once);
        }

        // --- Route attribute assertions ---

        [Test]
        public void Controller_HasExpectedRouteTemplate()
        {
            var routeAttr = typeof(StrategicChargeCodeController).GetCustomAttribute<RouteAttribute>();

            routeAttr.Should().NotBeNull();
            routeAttr.Template.Should().Be("api/v{api-version:apiVersion}/[controller]");
        }

        [TestCase(nameof(StrategicChargeCodeController.GetOpportunityChargeCode),  typeof(HttpGetAttribute),    "{opportunityId}/[action]")]
        [TestCase(nameof(StrategicChargeCodeController.CreateOpportunityChargeCode), typeof(HttpPostAttribute),  null)]
        [TestCase(nameof(StrategicChargeCodeController.UpdateOpportunityChargeCode), typeof(HttpPutAttribute),   "{opportunityId}")]
        [TestCase(nameof(StrategicChargeCodeController.DeleteOpportunityChargeCode), typeof(HttpDeleteAttribute), "{opportunityId}")]
        [TestCase(nameof(StrategicChargeCodeController.GetGoalDetail),              typeof(HttpPostAttribute),   "{opportunityId}/goal-detail")]
        [TestCase(nameof(StrategicChargeCodeController.ExportInitiative),           typeof(HttpPostAttribute),   "{opportunityId}/export")]
        [TestCase(nameof(StrategicChargeCodeController.ExportOpportunity),         typeof(HttpPostAttribute),   "{opportunityId}/export-opportunity")]
        [TestCase(nameof(StrategicChargeCodeController.GetTrackingDetail),          typeof(HttpPostAttribute),   "{opportunityId}/tracking-detail")]
        [TestCase(nameof(StrategicChargeCodeController.UpdateDetails),              typeof(HttpPutAttribute),    "{opportunityId}/details")]
        public void ActionRoute_HasExpectedHttpMethodAndTemplate(string methodName, Type httpAttrType, string expectedTemplate)
        {
            var method = typeof(StrategicChargeCodeController).GetMethod(methodName);
            method.Should().NotBeNull($"method '{methodName}' should exist on {nameof(StrategicChargeCodeController)}");

            var attr = method.GetCustomAttribute(httpAttrType);
            attr.Should().NotBeNull($"{methodName} should be decorated with [{httpAttrType.Name}]");
            var template = (string)attr.GetType().GetProperty("Template").GetValue(attr);
            template.Should().Be(expectedTemplate);
        }
    }
}