using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Reflection;
using LCU.Library.Internal.IncentiveApiModels.Enums;
using LCU.Library.Internal.IncentiveApiModels.Common;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;

namespace LCU.Library.Internal.IncentiveApiModels.Entities
{
    public class Department : Auditable, IValidatableObject
    {
        public int? Id { get; set; }

        [Required]
        [StringLength(255, MinimumLength = 3)]
        public string DepartmentName { get; set; }

        [Required]
        [StringLength(255, MinimumLength = 3)]
        public string DayforceDepartmentName { get; set; }

        public string? DnaOrgNbr { get; set; }

        [Required]
        public string? DayForceGlCode { get; set; }

        [Required]
        public string? BusinessLineCode { get; set; }

        public string? RegionCode { get; set; }

        [Required]
        [JsonConverter(typeof(StringEnumConverter))]
        public DepartmentState State { get; set; }

        public List<UserDepartment> Assignments { get; set; }

        public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
        {
            var results = new List<ValidationResult>();

            if (!typeof(BusinessLine).GetFields(BindingFlags.Static | BindingFlags.Public)
                .Where(x => x.FieldType == typeof(BusinessLine))
                .Select(x => (x.GetValue(x.Name) as BusinessLine)?.Code).Contains(BusinessLineCode))
            {
                results.Add(new ValidationResult("The supplied BusinessLineCode is not associated with any known BusinessLine", new[] { "BusinessLine" }));
            }

            if (RegionCode != null && Region.FindByCode(RegionCode) == null)
            {
                results.Add(new ValidationResult("The supplied RegionCode is not associated with any known Region", new[] { "Region" }));
            }

            return results;
        }
    }
}