using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using EnVisage.Code;

namespace EnVisage.Models
{
    public class VacationModel : IBaseModel<Vacation>, IValidatableObject
    {
        public Guid Id { get; set; }
        public Guid PeopleResourceId { get; set; }
        [Required]
        [Display(Name = "Start Date")]
        [DataType(DataType.Date), DisplayFormat(DataFormatString = "{0:MM/dd/yy}", ApplyFormatInEditMode = true)]
        public DateTime? StartDate { get; set; }
        [Required]
        [Display(Name = "End Date")]
        [DataType(DataType.Date), DisplayFormat(DataFormatString = "{0:MM/dd/yy}", ApplyFormatInEditMode = true)]
        public DateTime? EndDate { get; set; }
        [Required]
        [Display(Name = "Hours Off")]
        [Range(0, 100)]
        [UIHint("Slider")]
        public short HoursOff { get; set; }
        public decimal UOMValue { get; set; }
        public int? Duration {
            get { return StartDate.HasValue && EndDate.HasValue ? (EndDate.Value.Subtract(StartDate.Value).Days + 1) : (int?)null; }
        }
        public List<PeopleResourceVacationModel> PeopleResourceVacations { get; set; }
        /// <summary>
        /// Gets or sets a collection of weekend days during vacation.
        /// </summary>
        /// <remarks>
        /// Usually it is all Saturdays and Sundays, but can be overriden.
        /// </remarks>
        [Display(Name = "Weekends")]
        [UIHint("Weekends")]
        public List<DateTime> Weekends { get; set; }
        /// <summary>
        /// Gets or sets a day of the week when the week ends, according to system settings. Integer representation of <see cref="DayOfWeek"/> enum, 0 - Sunday.
        /// </summary>
        public short WeekendingDay { get; set; }

        public VacationModel()
        {
            PeopleResourceVacations = new List<PeopleResourceVacationModel>();
            Weekends = new List<DateTime>();
        }
        public void CopyTo(Vacation obj)
        {
            if (obj == null)
                throw new ArgumentNullException();

            obj.StartDate = StartDate.Value;
            obj.EndDate = EndDate.Value;
            obj.PeopleResourceId = PeopleResourceId;
            obj.HoursOff = HoursOff / 100.0M;
            obj.PeopleResourceVacations = PeopleResourceVacations.Select(t =>
                {
                    var o = new PeopleResourceVacation();
                    t.CopyTo(o);
                    return o;
                }).ToList();
            obj.Weekends = string.Join(",", Weekends.Select(t=>t.ToShortDateString()));
        }
        public static explicit operator VacationModel(Vacation obj)
        {
            if (obj == null)
                return null;
            var model = new VacationModel
            {
                Id = obj.Id,
                PeopleResourceId = obj.PeopleResourceId,
                StartDate = obj.StartDate,
                EndDate = obj.EndDate,
                HoursOff = Convert.ToInt16(obj.HoursOff * 100),
                Weekends = obj.Weekends.Split(new []{','}, StringSplitOptions.RemoveEmptyEntries).Select(c =>
                    {
                        DateTime dt;
                        return DateTime.TryParse(c, out dt) ? dt : DateTime.MinValue;
                    }).Where(t=>t != DateTime.MinValue).ToList()
            };
            var str = string.Empty;
            foreach (var dateTime in model.Weekends)
            {
                if (!string.IsNullOrEmpty(str))
                    str += ",";
                str += "'" + dateTime.ToShortDateString() + "'";
            }
            
            model.TrimStringProperties();
            return model;
        }
        public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
        {
            if (StartDate.Value > EndDate.Value)
                yield return new ValidationResult("End Date should be greater than Start Date", new[] { "StartDate", "EndDate" });
        }
    }
    public class PeopleResourceVacationModel : IBaseModel<PeopleResourceVacation>
    {
        public Guid Id { get; set; }
        public Guid PeopleResourceId { get; set; }
        public DateTime WeekEndingDate { get; set; }
        public int HoursOff { get; set; }
        public DateTime LastUpdate { get; set; }

        public void CopyTo(PeopleResourceVacation obj)
        {
            if (obj == null)
                throw new ArgumentNullException();

            obj.HoursOff = HoursOff;
            obj.LastUpdate = LastUpdate;
            obj.PeopleResourceId = PeopleResourceId;
            obj.WeekEndingDate = WeekEndingDate;
        }
    }
}