using System;
using LCU.Library.Internal.IncentiveApiModels.Common;

namespace LCU.Library.Internal.IncentiveApiModels.Entities
{
    public class UserDepartment : Auditable
    {
        public const int PayoutMax = 100;
        public int Id { get; set; }
        public Guid AppUserId { get; set; }
        public int DepartmentId { get; set; }
        public Role Role { get; set; }
        public DateTime StartDate { get; set; }
        public DateTime? EndDate { get; set; }
        public string? Note { get; set; }
        public bool IsHome { get; set; }
        public decimal SlidingPayout { get; set; }
        public AppUser Employee { get; set; }
        public Department Department { get; set; }

        public int SafeGetDepartmentId()
        {
            return Department?.Id ?? DepartmentId;
        }

        public bool IsConflictingAssignment(UserDepartment newAssignment, out string message)
        {
            message = string.Empty;
            if (newAssignment.Employee.EmployeeId != Employee.EmployeeId || newAssignment.Department.Id != DepartmentId)
            {
                return false;
            }

            if (EndDate == null)
            {
                message = $"Current assignment to department: {newAssignment.Department.DepartmentName} exists.";
                return true;
            }

            if (newAssignment.EndDate == null)
            {
                var startsBeforeEndDate = newAssignment.StartDate.Date <= EndDate.Value.Date;
                message = startsBeforeEndDate ? $"Assignment would overlap existing assignment to department: {newAssignment.Department.DepartmentName}" : string.Empty;
                return startsBeforeEndDate;
            }

            if (newAssignment.StartDate.Date > EndDate.Value.Date || newAssignment.EndDate.Value.Date < StartDate.Date)
            {
                return false;
            }

            message = $"Assignment would overlap existing assignment to department: {newAssignment.Department.DepartmentName}";
            return true;
        }
    }
}