using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using LCU.API.Internal.Operations.IncentiveApiLib.Persistence;
using LCU.API.Internal.Operations.IncentiveApiLib.Repositories;
using LCU.API.Internal.Operations.IncentiveApi.Services;
using LCU.Library.Internal.IncentiveApiModels.Entities;
using LCU.Library.Internal.IncentiveApiModels.Enums;
using Microsoft.EntityFrameworkCore;
using Moq;
using NUnit.Framework;
using LCU.API.Internal.Operations.IncentiveApi.Exceptions;

namespace Application.UnitTests.Services
{
    public class DepartmentServiceTest
    {
        private DepartmentService _departmentService;
        private IDepartmentRepository _departmentRepository;
        private ICurrentUserService _currentUserService;
        private IUserAssignmentService _userAssignmentService;
        private ApplicationDbContext _context;

        [SetUp]
        public void Setup()
        {
            var mockDateTime = new DateTimeService();
            _currentUserService = Mock.Of<ICurrentUserService>();
            _userAssignmentService = Mock.Of<IUserAssignmentService>();

            Mock.Get(_currentUserService).Setup(s => s.GetCurrentUser()).Returns(new ApplicationUser()
            {
                Email = "JohnTest@test.com"
            });
            var options = new DbContextOptionsBuilder<ApplicationDbContext>()
                .UseInMemoryDatabase(Guid.NewGuid().ToString())
                .EnableSensitiveDataLogging(true)
                .Options;
            _context = new ApplicationDbContext(options, _currentUserService, mockDateTime);
            _departmentRepository = new DepartmentRepository(_context);

            _departmentService =
                new DepartmentService(_departmentRepository, _userAssignmentService, new UnitOfWork(_context));
        }

        [Test]
        public async Task Basic_Flow()
        {
            //Retrieve Empty
            var departments = await _departmentService.GetAllDepartmentsAsync();
            Assert.IsNotNull(departments);
            Assert.IsEmpty(departments);

            //Add New Department
            var department = await _departmentService.SaveDepartmentAsync(new Department()
            {
                BusinessLineCode = "1",
                DayforceDepartmentName = "TestName",
                DayForceGlCode = "1",
                DepartmentName = "TestName",
                DnaOrgNbr = "1"
            });
            Assert.NotNull(department);
            Assert.True(department.DepartmentName == "TestName");

            //New Department Can Be Retrieved
            departments = await _departmentService.GetAllDepartmentsAsync();
            Assert.IsNotNull(departments);
            Assert.True(departments.Count == 1);
            Assert.True(departments.SingleOrDefault()?.DepartmentName == "TestName");

            var id = departments.SingleOrDefault()?.Id;
            if (id == null)
            {
                Assert.Fail("Department ID was null, a save failed");
                return;
            }

            //Department can be updated
            department =
                await _departmentService.UpdateDepartmentAsync(
                    new Department()
                    {
                        DepartmentName = "NewName", State = DepartmentState.Active, BusinessLineCode = "BUS",
                        RegionCode = "CENTRAL"
                    }, (int)id);
            Assert.NotNull(department);
            Assert.True(department.DepartmentName == "NewName");
            Assert.True(department.BusinessLineCode == "BUS");
            Assert.True(department.RegionCode == "CENTRAL");
            Assert.True(department.State == DepartmentState.Active);

            //Updated department can be retrieved individually
            department = await _departmentService.GetDepartmentByIdAsync((int)id);
            Assert.True(department.DepartmentName == "NewName");

            //Updated department can be retrieved by all
            departments = await _departmentService.GetAllDepartmentsAsync();
            Assert.IsNotNull(departments);
            Assert.True(departments.Count == 1);
        }

        [Test]
        public async Task Throws_Duplicate_Exception()
        {
            //Add New Department
            var testDepartment = await _departmentService.SaveDepartmentAsync(new Department()
            {
                BusinessLineCode = "1",
                DayforceDepartmentName = "TestName",
                DayForceGlCode = "1",
                DepartmentName = "TestName",
                DnaOrgNbr = "1"
            });
            Assert.NotNull(testDepartment);
            Assert.True(testDepartment.DepartmentName == "TestName");

            //Add New Department
            var testDepartment2 = await _departmentService.SaveDepartmentAsync(new Department()
            {
                BusinessLineCode = "1",
                DayforceDepartmentName = "TestName2",
                DayForceGlCode = "1",
                DepartmentName = "TestName2",
                DnaOrgNbr = "1"
            });
            Assert.NotNull(testDepartment2);
            Assert.True(testDepartment2.DepartmentName == "TestName2");

            //Add New Department With Same Name
            Assert.ThrowsAsync<DuplicateDataException>(async () =>
            {
                await _departmentService.SaveDepartmentAsync(new Department() { BusinessLineCode = "1",
                    DayforceDepartmentName = "TestName",
                    DayForceGlCode = "1",
                    DepartmentName = "TestName",
                    DnaOrgNbr = "1" });
            });

            //Add New Department With Same Name Ignore Case
            Assert.ThrowsAsync<DuplicateDataException>(async () =>
            {
                await _departmentService.SaveDepartmentAsync(new Department() { BusinessLineCode = "1",
                    DayforceDepartmentName = "TestName",
                    DayForceGlCode = "1",
                    DepartmentName = "testname",
                    DnaOrgNbr = "1" });
            });


            //Update Department To Already Existing Name
            Assert.ThrowsAsync<DuplicateDataException>(async () =>
            {
                await _departmentService.UpdateDepartmentAsync(new Department() { DepartmentName = "TestName" },
                    testDepartment2.Id ?? 1);
            });

            //Allow Update to Update itself (Same Name), should not throw
            try
            {
                var updatedDepartment = await _departmentService.UpdateDepartmentAsync(
                    new Department() { DepartmentName = "TestName2", BusinessLineCode = "2" }, testDepartment2.Id ?? 1);
                Assert.AreEqual("TestName2", updatedDepartment.DepartmentName);
            }
            catch (Exception)
            {
                Assert.Fail();
            }
        }

        [Test]
        public async Task GetDepartmentDetailsAsync_Basic()
        {
            var department = new Department()
            {
                DepartmentName = "Dept1",
                Id = 55,
                State = DepartmentState.Active
            };

            var user = new AppUser
            {
                HomeDepartment = "Home",
                Role = Role.Admin,
                AdEmail = "AbrahamTestAssociate1@test.com",
                EmployeeId = "11771",
                FullName = "Abraham TestAssociate1",
                BaseRole = "UNKNOWN",
                Departments = new List<UserDepartment>()
            };

            user.Departments.ForEach(x => x.Employee = user);

            var yesterday = DateTime.Now.AddDays(-1);

            var testDepartment = await _departmentService.SaveDepartmentAsync(new Department()
            {
                BusinessLineCode = "1",
                DayforceDepartmentName = "TestName",
                DayForceGlCode = "1",
                DepartmentName = "TestName",
                DnaOrgNbr = "1",
                Assignments = new List<UserDepartment>
                {
                    new UserDepartment()
                    {
                        Id = 11,
                        Department = department,
                        Employee = user,
                        Role = Role.BM,
                        IsHome = true,
                        StartDate = yesterday,
                        EndDate = null
                    },
                    new UserDepartment()
                    {
                        Id = 12,
                        Department = department,
                        Employee = user,
                        Role = Role.BM,
                        IsHome = false,
                        StartDate = yesterday,
                        EndDate = null
                    }
                }
            });

            var result = await _departmentService.GetDepartmentDetailsAsync(testDepartment.Id.Value);

            Assert.AreEqual("TestName", result.Department.DepartmentName);
            Assert.AreEqual(testDepartment.Assignments.Count, result.Assignments.Count);
            Assert.AreEqual(11, result.Assignments.ElementAt(0).Id);
            Assert.AreEqual(12, result.Assignments.ElementAt(1).Id);
            Assert.IsNull(result.RegionalManager);

            Mock.Get(_userAssignmentService).Verify(
                mock => mock.GetUserAssignment(AssignmentType.RegionalManager, It.IsAny<string>()),
                Times.Never);
        }

        [Test]
        public void GetDepartmentDetailsAsync_NotFoundException()
        {
            var exception = Assert.ThrowsAsync<NotFoundException>(async () => { await _departmentService.GetDepartmentDetailsAsync(1); });

            Assert.AreEqual("Could Not Find Department With ID 1", exception.Message);
        }

        [Test]
        public async Task GetDepartmentDetailsAsync_RegionCodeLookup()
        {
            var user = new AppUser
            {
                HomeDepartment = "Home",
                Role = Role.Admin,
                AdEmail = "user@landmarkcu.com",
                EmployeeId = "C0000",
                FullName = "Abraham TestAssociate1",
                BaseRole = "UNKNOWN",
                PersonId = 0,
                Departments = new List<UserDepartment>()
            };
            var yesterday = DateTime.Now.AddDays(-1);
            var testDepartment = await _departmentService.SaveDepartmentAsync(new Department()
            {
                BusinessLineCode = "1",
                DayforceDepartmentName = "TestName",
                DayForceGlCode = "1",
                DepartmentName = "TestName",
                DnaOrgNbr = "1",
                Assignments = new List<UserDepartment>
                {
                    new UserDepartment { Id = 11, StartDate = yesterday, Employee = user, IsHome = true, Role = Role.Admin},
                    new UserDepartment { Id = 12, StartDate = yesterday, Employee = user, IsHome = false, Role = Role.Admin}
                },
                RegionCode = "NORTH"
            });
            var regionalManager = new AppUser
                { AdEmail = "regionalManager@landmarkcu.com", EmployeeId = "RM000", PersonId = 1 };
            var regionalManagerAssignment = new UserAssignment
            {
                Type = AssignmentType.RegionalManager,
                Key = testDepartment.RegionCode,
                AppUser = regionalManager
            };
            Mock.Get(_userAssignmentService)
                .Setup(mock => mock.GetUserAssignment(AssignmentType.RegionalManager, It.IsAny<string>()))
                .ReturnsAsync(regionalManagerAssignment);


            var result = await _departmentService.GetDepartmentDetailsAsync(testDepartment.Id.Value);

            Assert.AreEqual("regionalManager@landmarkcu.com", result.RegionalManager.AdEmail);
            Assert.AreEqual("RM000", result.RegionalManager.EmployeeId);
            Assert.AreEqual(1, result.RegionalManager.PersonId);

            Mock.Get(_userAssignmentService).Verify(
                mock => mock.GetUserAssignment(AssignmentType.RegionalManager, It.IsAny<string>()),
                Times.Once);
        }

        [Test]
        public async Task GetHierarchicalDepartmentsForEmployeeAsync_Basic_ADMIN()
        {
            var departmentRepository = Mock.Of<IDepartmentRepository>();
            var userAssignmentService = Mock.Of<IUserAssignmentService>();
            var mockUnitOfWork = new Mock<IUnitOfWork>();
            var departmentService =
                new DepartmentService(departmentRepository, userAssignmentService, mockUnitOfWork.Object);

            var user = new AppUser()
            {
                AdEmail = "tester@test.com",
                BaseRole = "Tester",
                EmployeeId = "11771",
                FullName = "Test McTester",
                HomeDepartment = "HOME",
                PersonId = 565,
                Departments = new List<UserDepartment>()
                {
                    new UserDepartment()
                    {
                        DepartmentId = 55,
                        Role = Role.Admin
                    }
                }
            };

            Mock.Get(departmentRepository).Setup(s => s.GetAllDepartmentsAsync()).ReturnsAsync(new List<Department>()
            {
                new Department()
                {
                    DepartmentName = "testdep1"
                }
            });

            Mock.Get(departmentRepository).Setup(s => s.FindDepartmentsByRegionAsync(It.IsAny<Region>())).ReturnsAsync(new List<Department>()
            {
                new Department()
                {
                    DepartmentName = "testdep2"
                }
            });

            var results = await departmentService.GetHierarchicalDepartmentsForEmployeeAsync(user, false);
            Assert.NotNull(results);
            Assert.IsNotEmpty(results);
            Mock.Get(departmentRepository).Verify(s => s.GetAllDepartmentsAsync(), Times.Once);
            Mock.Get(departmentRepository).Verify(s => s.FindDepartmentsByRegionAsync(It.IsAny<Region>()), Times.Never);
        }

        [Test]
        public async Task GetHierarchicalDepartmentsForEmployeeAsync_Basic_RM()
        {
            var departmentRepository = Mock.Of<IDepartmentRepository>();
            var userAssignmentService = Mock.Of<IUserAssignmentService>();
            var mockUnitOfWork = new Mock<IUnitOfWork>();
            var departmentService =
                new DepartmentService(departmentRepository, userAssignmentService, mockUnitOfWork.Object);

            var user = new AppUser()
            {
                AdEmail = "tester@test.com",
                BaseRole = "Tester",
                EmployeeId = "11771",
                FullName = "Test McTester",
                HomeDepartment = "HOME",
                PersonId = 565,
                Departments = new List<UserDepartment>()
                {
                    new UserDepartment()
                    {
                        DepartmentId = 55,
                        Role = Role.RegionalManager,
                        Department = new Department()
                        {
                            RegionCode = Region.East.Code
                        }
                    }
                }
            };

            Mock.Get(departmentRepository).Setup(s => s.GetAllDepartmentsAsync()).ReturnsAsync(new List<Department>()
            {
                new Department()
                {
                    DepartmentName = "testdep1"
                }
            });

            Mock.Get(departmentRepository).Setup(s => s.FindDepartmentsByRegionAsync(It.IsAny<Region>())).ReturnsAsync(new List<Department>()
            {
                new Department()
                {
                    DepartmentName = "testdep2"
                }
            });

            var results = await departmentService.GetHierarchicalDepartmentsForEmployeeAsync(user, false);
            Assert.NotNull(results);
            Assert.IsNotEmpty(results);
            Mock.Get(departmentRepository).Verify(s => s.GetAllDepartmentsAsync(), Times.Never);
            Mock.Get(departmentRepository).Verify(s => s.FindDepartmentsByRegionAsync(It.IsAny<Region>()), Times.Once);
        }

        // if you are RM but there is no region, you'll just get the branch where you are RM back...
        [Test]
        public async Task GetHierarchicalDepartmentsForEmployeeAsync_Basic_RM_null_region()
        {
            var departmentRepository = Mock.Of<IDepartmentRepository>();
            var userAssignmentService = Mock.Of<IUserAssignmentService>();
            var mockUnitOfWork = new Mock<IUnitOfWork>();
            var departmentService =
                new DepartmentService(departmentRepository, userAssignmentService, mockUnitOfWork.Object);

            var user = new AppUser()
            {
                AdEmail = "tester@test.com",
                BaseRole = "Tester",
                EmployeeId = "11771",
                FullName = "Test McTester",
                HomeDepartment = "HOME",
                PersonId = 565,
                Departments = new List<UserDepartment>()
                {
                    new UserDepartment()
                    {
                        DepartmentId = 55,
                        Role = Role.RegionalManager,
                        Department = new Department()
                        {
                            DepartmentName = "testdep3"
                            // No Region.
                        },
                        StartDate = DateTime.Today
                    }
                }
            };

            Mock.Get(departmentRepository).Setup(s => s.GetAllDepartmentsAsync()).ReturnsAsync(new List<Department>()
            {
                new Department()
                {
                    DepartmentName = "testdep1"
                }
            });

            Mock.Get(departmentRepository).Setup(s => s.FindDepartmentsByRegionAsync(It.IsAny<Region>())).ReturnsAsync(new List<Department>()
            {
                new Department()
                {
                    DepartmentName = "testdep2"
                }
            });

            var results = await departmentService.GetHierarchicalDepartmentsForEmployeeAsync(user, false);
            Assert.NotNull(results);
            Assert.IsNotEmpty(results);
            Mock.Get(departmentRepository).Verify(s => s.GetAllDepartmentsAsync(), Times.Never);
            Mock.Get(departmentRepository).Verify(s => s.FindDepartmentsByRegionAsync(It.IsAny<Region>()), Times.Never);
        }

        [Test]
        public async Task GetHierarchicalDepartmentsForEmployeeAsync_Basic_ABM_MANAGER_BM()
        {
            var departmentRepository = Mock.Of<IDepartmentRepository>();
            var userAssignmentService = Mock.Of<IUserAssignmentService>();
            var mockUnitOfWork = new Mock<IUnitOfWork>();
            var departmentService =
                new DepartmentService(departmentRepository, userAssignmentService, mockUnitOfWork.Object);

            var user = new AppUser()
            {
                AdEmail = "tester@test.com",
                BaseRole = "Tester",
                EmployeeId = "11771",
                FullName = "Test McTester",
                HomeDepartment = "HOME",
                PersonId = 565,
                Departments = new List<UserDepartment>()
                {
                    new UserDepartment()
                    {
                        DepartmentId = 55,
                        Role = Role.ABM,
                        Department = new Department()
                        {
                            DepartmentName = "testdeptabm"
                        }
                    }
                }
            };

            Mock.Get(departmentRepository).Setup(s => s.GetAllDepartmentsAsync()).ReturnsAsync(new List<Department>()
            {
                new Department()
                {
                    DepartmentName = "testdep1"
                }
            });

            Mock.Get(departmentRepository).Setup(s => s.FindDepartmentsByRegionAsync(It.IsAny<Region>())).ReturnsAsync(new List<Department>()
            {
                new Department()
                {
                    DepartmentName = "testdep2"
                }
            });

            var results = await departmentService.GetHierarchicalDepartmentsForEmployeeAsync(user, true);
            Assert.NotNull(results);
            Assert.IsNotEmpty(results);
            Mock.Get(departmentRepository).Verify(s => s.GetAllDepartmentsAsync(), Times.Never);
            Mock.Get(departmentRepository).Verify(s => s.FindDepartmentsByRegionAsync(It.IsAny<Region>()), Times.Never);

            results = await departmentService.GetHierarchicalDepartmentsForEmployeeAsync(user, false);
            Assert.NotNull(results);
            Assert.IsEmpty(results);
        }
    }
}