#region Header

// *************************************************
// Project:       RENAPI
// File name:     OverrideRec.cs
// Developer:     Marc Simkin
// Creation Date: 07/02/2014 12:02 PM
// Last Changed:  07/09/2014 2:54 PM
// *************************************************

#endregion

#region Using

using System;
using System.ComponentModel.DataAnnotations;
using System.Collections.Generic;
using System.Web.Script.Serialization;
using MongoDB.Bson.Serialization.Attributes;

#endregion

namespace bn.pds.ren.RENAPI.objects.ren
{
    public enum OverrideType
    {
        NoChange = 0,
        Exclude = 1,
        Replace = 2,
        Move = 3,
        Add = 4,
        GlobalExclude = 5,
        Include = 6,
        UndoAdd = 7,
        BatchAdd = 8,
        GlobalExcludeDelete = 98,
        SavePoint = 99,
        Audit = 100
    }

    public class OverrideRec : IValidatableObject
    {
        public OverrideRec()
        {
            OverrideType = OverrideType.NoChange;
        }

        public OverrideRec(long ean, int position)
            : this()
        {
            Ean = ean;
            Position = position;
        }

        public long Ean { get; set; }
        public int Position { get; set; }
        public OverrideType OverrideType { get; set; }
        public string Reason { get; set; }
        public long Score { get; set; }
        public int OriginalPosition { get; set; }

        [BsonIgnore]
        public bool IsFixed { get; set; }

        public UserInfo ModifiedBy { get; set; }

        [BsonDateTimeOptions(Kind = DateTimeKind.Local)]
        public DateTime ModifiedOn { get; set; }

        public override string ToString()
        {
            return new JavaScriptSerializer().Serialize(this);
        }

        public static OverrideRec CreateSavePoint()
        {
            return new OverrideRec { Ean = 0, OriginalPosition = 0, OverrideType = OverrideType.SavePoint, Position = 0 };
        }

        public static OverrideRec CreateAuditEntry(UserInfo userInfo, DateTime modifiedTime)
        {
            if (userInfo == null)
                throw new ArgumentNullException("userInfo", "The user info needs to be provided.");

            if (modifiedTime == DateTime.MinValue || modifiedTime == DateTime.MaxValue)
                throw new ArgumentNullException("modifiedTime", "A valid modification time must be supplied.");

            return new OverrideRec { Ean = 0, OriginalPosition = 0, OverrideType = OverrideType.Audit, Position = 0, ModifiedBy = userInfo, ModifiedOn = modifiedTime };
        }

        #region IValidateObject Interface Methods
        public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
        {
            // position = rank and should never be 0;check that the required fields are present.
            if (Position <= 0)
            {
                ValidationResult error = new ValidationResult("The Position is required and needs to be greater than 0.", new[] { "Position" });
                yield return error;
            }

            if (Position <= 0)
            {
                ValidationResult error = new ValidationResult("The OriginalPosition is required and needs to be greater than 0.", new[] { "OriginalPosition" });
                yield return error;
            }

            if (!IsFixed)
            {
                if (OverrideType == OverrideType.Move && OriginalPosition <= 0)
                {
                    ValidationResult error = new ValidationResult("The OriginalPosition needs to be greater than 0 when the operation type is move.", new[] { "OriginalPosition" });
                    yield return error;
                }

                if (OverrideType == OverrideType.Move && OriginalPosition == Position)
                {
                    ValidationResult error = new ValidationResult("You can't place the recommendation on top of itself.", new[] { "Position" });
                    yield return error;
                }                
            }                
        }
        #endregion IValidateObject Interface Methods
    }
}