using System;
using LCU.Library.Internal.IncentiveApiModels.Entities;
using LCU.Library.Internal.IncentiveApiModels.Enums;
using NUnit.Framework;

namespace Application.UnitTests.Entities
{
    public class UserDepartmentTest
    {
        private readonly AppUser _employee = new AppUser()
        {
            EmployeeId = "5",
            PersonId = 0,
            AdEmail = "nobody@nowhere.com"
        };

        [Test]
        public void NonConflictingAssignment_Diff_Dept()
        {
            var existingAssignment = new UserDepartment()
            {
                DepartmentId = 5,
                Employee = _employee,
                StartDate = DateTime.Today,
                EndDate = null
            };

            var newAssignment = new UserDepartment()
            {
                // DepartmentID will be NULL.
                Department = new Department()
                {
                    Id = 6,
                    State = DepartmentState.Active,
                    DepartmentName = "Test",
                    BusinessLineCode = BusinessLine.Operations.Code
                },
                Employee = _employee,
                StartDate = DateTime.Today,
                EndDate = null
            };

            Assert.False(existingAssignment.IsConflictingAssignment(newAssignment, out string message));
            Assert.AreEqual(string.Empty, message);
        }

        [Test]
        public void NonConflictingAssignment_Diff_User()
        {
            var employee2 = new AppUser()
            {
                EmployeeId = "6",
                PersonId = 0,
                AdEmail = "nobody2@nowhere.com"
            };
            var existingAssignment = new UserDepartment()
            {
                DepartmentId = 5,
                Employee = _employee,
                StartDate = DateTime.Today,
                EndDate = null
            };

            var newAssignment = new UserDepartment()
            {
                // DepartmentID will be NULL.
                Department = new Department()
                {
                    Id = 5,
                    State = DepartmentState.Active,
                    DepartmentName = "Test",
                    BusinessLineCode = BusinessLine.Operations.Code
                },
                Employee = employee2,
                StartDate = DateTime.Today,
                EndDate = null
            };

            Assert.False(existingAssignment.IsConflictingAssignment(newAssignment, out string message));
            Assert.AreEqual(string.Empty, message);
        }

        [Test]
        public void ConflictingAssignment_Case_Null_Null()
        {
            var existingAssignment = new UserDepartment()
            {
                DepartmentId = 5,
                Employee = _employee,
                StartDate = DateTime.Today,
                EndDate = null
            };

            var newAssignment = new UserDepartment()
            {
                // DepartmentID will be NULL.
                Department = new Department()
                {
                    Id = 5,
                    State = DepartmentState.Active,
                    DepartmentName = "Test",
                    BusinessLineCode = BusinessLine.Operations.Code
                },
                Employee = _employee,
                StartDate = DateTime.Today,
                EndDate = null
            };

            Assert.True(existingAssignment.IsConflictingAssignment(newAssignment, out string message));
        }

        [Test]
        public void ConflictingAssignment_Case_Null_Valid()
        {
            var existingAssignment = new UserDepartment()
            {
                DepartmentId = 5,
                Employee = _employee,
                StartDate = DateTime.Parse("2021-01-01T00:00:00.000Z").ToUniversalTime(),
                EndDate = null
            };

            var newAssignment = new UserDepartment()
            {
                // DepartmentID will be NULL.
                Department = new Department()
                {
                    Id = 5,
                    State = DepartmentState.Active,
                    DepartmentName = "Test",
                    BusinessLineCode = BusinessLine.Operations.Code
                },
                Employee = _employee,
                StartDate = DateTime.Parse("2021-07-01T00:00:00.000Z").ToUniversalTime(),
                EndDate = DateTime.Parse("2021-07-31T23:59:00.000Z").ToUniversalTime()
            };

            Assert.True(existingAssignment.IsConflictingAssignment(newAssignment, out string message));
        }

        [Test]
        public void ConflictingAssignment_Case_Valid_Null_Before()
        {
            var existingAssignment = new UserDepartment()
            {
                DepartmentId = 5,
                Employee = _employee,
                StartDate = DateTime.Today,
                EndDate = DateTime.Today.AddDays(1)
            };

            var newAssignment = new UserDepartment()
            {
                // DepartmentID will be NULL.
                Department = new Department()
                {
                    Id = 5,
                    State = DepartmentState.Active,
                    DepartmentName = "Test",
                    BusinessLineCode = BusinessLine.Operations.Code
                },
                Employee = _employee,
                StartDate = DateTime.Today.AddDays(1),
                EndDate = null
            };

            Assert.True(existingAssignment.IsConflictingAssignment(newAssignment, out string message));
        }

        [Test]
        public void NonConflictingAssignment_Case_Valid_Null_After()
        {
            var existingAssignment = new UserDepartment()
            {
                DepartmentId = 5,
                Employee = _employee,
                StartDate = DateTime.Today,
                EndDate = DateTime.Today.AddDays(1)
            };

            var newAssignment = new UserDepartment()
            {
                // DepartmentID will be NULL.
                Department = new Department()
                {
                    Id = 5,
                    State = DepartmentState.Active,
                    DepartmentName = "Test",
                    BusinessLineCode = BusinessLine.Operations.Code
                },
                Employee = _employee,
                StartDate = DateTime.Today.AddDays(2),
                EndDate = null
            };

            Assert.False(existingAssignment.IsConflictingAssignment(newAssignment, out string message));
        }

        [Test]
        public void NonConflictingAssignment_Case_Valid_Valid_After()
        {
            var existingAssignment = new UserDepartment()
            {
                DepartmentId = 5,
                Employee = _employee,
                StartDate = DateTime.Parse("2021-07-01T00:00:00.000Z").ToUniversalTime(),
                EndDate = DateTime.Parse("2021-07-31T23:59:00.000Z").ToUniversalTime()
            };

            var newAssignment = new UserDepartment()
            {
                // DepartmentID will be NULL.
                Department = new Department()
                {
                    Id = 5,
                    State = DepartmentState.Active,
                    DepartmentName = "Test",
                    BusinessLineCode = BusinessLine.Operations.Code
                },
                Employee = _employee,
                StartDate = DateTime.Parse("2021-08-01T00:00:00.000Z").ToUniversalTime(),
                EndDate = DateTime.Parse("2021-08-31T23:59:00.000Z").ToUniversalTime()
            };

            Assert.False(existingAssignment.IsConflictingAssignment(newAssignment, out string message));
        }

        [Test]
        public void NonConflictingAssignment_Case_Valid_Valid_Before()
        {
            var existingAssignment = new UserDepartment()
            {
                DepartmentId = 5,
                Employee = _employee,
                StartDate = DateTime.Parse("2021-07-01T00:00:00.000Z").ToUniversalTime(),
                EndDate = DateTime.Parse("2021-07-31T23:59:00.000Z").ToUniversalTime()
            };

            var newAssignment = new UserDepartment()
            {
                // DepartmentID will be NULL.
                Department = new Department()
                {
                    Id = 5,
                    State = DepartmentState.Active,
                    DepartmentName = "Test",
                    BusinessLineCode = BusinessLine.Operations.Code
                },
                Employee = _employee,
                StartDate = DateTime.Parse("2021-06-01T00:00:00.000Z").ToUniversalTime(),
                EndDate = DateTime.Parse("2021-06-30T23:59:00.000Z").ToUniversalTime()
            };

            Assert.False(existingAssignment.IsConflictingAssignment(newAssignment, out string message));
        }

        [Test]
        public void ConflictingAssignment_Case_Valid_Valid_Overlap()
        {
            var existingAssignment = new UserDepartment()
            {
                DepartmentId = 5,
                Employee = _employee,
                StartDate = DateTime.Today,
                EndDate = DateTime.Today.AddDays(5)
            };

            var newAssignment = new UserDepartment()
            {
                // DepartmentID will be NULL.
                Department = new Department()
                {
                    Id = 5,
                    State = DepartmentState.Active,
                    DepartmentName = "Test",
                    BusinessLineCode = BusinessLine.Operations.Code
                },
                Employee = _employee,
                StartDate = DateTime.Today.AddDays(2),
                EndDate = DateTime.Today.AddDays(10)
            };

            Assert.True(existingAssignment.IsConflictingAssignment(newAssignment, out string message));
        }

        [Test]
        public void ConflictingAssignment_Case_Overlap_IgnoreTimestamp()
        {
            var existingAssignment = new UserDepartment()
            {
                DepartmentId = 5,
                Employee = _employee,
                StartDate = DateTime.Parse("2021-07-01T00:00:00.000Z").ToUniversalTime(),
                EndDate = DateTime.Parse("2021-07-05T12:00:00.000Z").ToUniversalTime()
            };

            var newAssignment = new UserDepartment()
            {
                // DepartmentID will be NULL.
                Department = new Department()
                {
                    Id = 5,
                    State = DepartmentState.Active,
                    DepartmentName = "Test",
                    BusinessLineCode = BusinessLine.Operations.Code
                },
                Employee = _employee,
                StartDate = DateTime.Parse("2021-07-05T15:00:00.000Z").ToUniversalTime(),
                EndDate = DateTime.Parse("2021-07-08T00:00:00.000Z").ToUniversalTime()
            };

            Assert.True(existingAssignment.IsConflictingAssignment(newAssignment, out string message));
        }
    }
}