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

namespace EnVisage.Models
{
    public class FiscalCalendarModel : IValidatableObject
    {
        #region Classes and enums
        /// <summary>
        /// Represents a fiscal calendar type. 
        /// </summary>
        public enum FiscalCalendarType
        {
            /// <summary>
            /// Undefined = -1.
            /// </summary>
            //[DisplayValue("")]
            //Undefined = -1,
            /// <summary>
            /// Calendar Year = 0.
            /// </summary>
            [DisplayValue("Calendar Year")]
            CalendarYear = 0,
            /// <summary>
            /// 4-4-5 weeks calendar where each quarter contains of 3 months with 4, 4 and 5 weeks.  
            /// </summary>
            [DisplayValue("4,4,5 weeks Calendar")]
            Calendar445 = 1,
            /// <summary>
            /// 4-5-4 weeks calendar where each quarter contains of 3 months with 4, 5 and 4 weeks.  
            /// </summary>
            [DisplayValue("4,5,4 weeks Calendar")]
            Calendar454 = 2,
            /// <summary>
            /// 5-4-4 weeks calendar where each quarter contains of 3 months with 5, 4 and 4 weeks.  
            /// </summary>
            [DisplayValue("5,4,4 weeks Calendar")]
            Calendar544 = 3,
        }

        /// <summary>
        /// Represents a way of ending the calendar year and distribution of weeks between quarters.
        /// </summary>
        public enum CalendarYearType
        {
            [DisplayValue("52 weeks only")]
            Only52Weeks = 0,
            [DisplayValue("Last <Week ending day> of the month")]
            LastWeekDay = 1,
            [DisplayValue("Standard Year")]
            StandardYear = 2
        }

        /// <summary>
        /// Represents a fiscal year record type.
        /// </summary>
        public enum FiscalYearType
        {
            Week = 0,
            Month = 1,
            Quarter = 2,
            Year = 3
        }

        #endregion

        #region Constructors
        public FiscalCalendarModel()
        {
            TypeSettingId = StartDateSettingId = WeekEndingSettingId = WeekEndingTypeSettingId = Guid.Empty;
        }
        #endregion

        #region Properties
        public Guid TypeSettingId { get; set; }
        public Guid StartDateSettingId { get; set; }
        public Guid WeekEndingSettingId { get; set; }
        public Guid WeekEndingTypeSettingId { get; set; }

        [Required]
        [Display(Name = "Calendar Type")]
        public FiscalCalendarType? Type { get; set; }

        [DataType(DataType.Date), DisplayFormat(DataFormatString = "{0:MM/dd/yy}", ApplyFormatInEditMode = true)]
        [Display(Name = "Current Year Start Date")]
        public DateTime? CurrentYearStartDate { get; set; }

        [Display(Name = "Week Ending")]
        public DayOfWeek? WeekEnding { get; set; }

        [Display(Name = "Year Type")]
        public CalendarYearType? WeekEndingType { get; set; }

        [Display(Name = "Adjust Period")]
        public bool Adjustingperiod { get; set; }

        #endregion

        #region Methods

        /// <summary>
        /// Validates an object and returns a collection that holds failed-validation information.
        /// </summary>
        /// <returns>
        /// A collection that holds failed-validation information.
        /// </returns>
        /// <param name="validationContext">The validation context.</param>
        public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
        {
            switch (Type)
            {
                case FiscalCalendarType.CalendarYear:
                    yield break;
                default:
                    if (this.WeekEndingType == null)
                        yield return new ValidationResult(string.Format(Constants.ERROR_TEMPLATE_REQUIRED, "Week Ending Type"), new [] { "WeekEndingType" });
                    if (this.CurrentYearStartDate == null)
                        yield return new ValidationResult(string.Format(Constants.ERROR_TEMPLATE_REQUIRED, "Current Year Start Date"), new[] { "CurrentYearStartDate" });
                    break;
            }
        }
        #endregion
    }
}