using System;
using System.ComponentModel;

using TSLab.Script.Handlers;
using TSLab.Script.Handlers.Options;

namespace GanovCubes
{
    public enum IntervalType { Дней, Часов, Минут };

    #region CubeDescription
    [Obsolete]

    [HandlerCategory("Ganov Cubes. DateTime")]
    [HandlerName("IntervalsBetweenDates", Language = "ru-ru")]
    [Description("Считает количество интервалов: Дней, Часов, Минут между датами")]
    [HelperLink("http://forum.tslab.ru/ubb/ubbthreads.php?ubb=showflat&Number=86894&page=1", "Страница на форуме TSLab", "ru-ru")]

    [InputsCount(2)]
    [Input(0, TemplateTypes.DOUBLE, Name = "StartDate (меньшая дата)")]
    [Input(1, TemplateTypes.DOUBLE, Name = "EndDate (бОльшая дата)")]

    [OutputsCount(1)]
    [OutputType(TemplateTypes.DOUBLE)]
    #endregion

    public class IntervalsBetweenDates : IContextUses, IValuesHandler
    {
        /// <summary>
        /// Минимальная дата для тестировании на истории
        /// </summary>
        private const double minHistoryData = 10101; // 01.01.2001

        public IContext Context { set; get; }

        [HandlerParameter(true, "Дней", NotOptimized = true, Name = "Интервал", IsVisibleInBlock = true)]
        [Description("Интервал: Дней, Часов, Минут")]
        public IntervalType IntType { get; set; }

        public double Execute() => CalculateInterval(0, 0);
        public double Execute(double startDate) => CalculateInterval(startDate, 0);
        public double Execute(double startDate, double endDate) => CalculateInterval(startDate, endDate);

        private double CalculateInterval(double startDate, double endDate)
        {
            if (startDate == 0 || endDate == 0
                || startDate.ToString().Length < 5 || endDate.ToString().Length < 5
                || startDate < minHistoryData || endDate < minHistoryData
                || startDate % 1 != 0 || endDate % 1 != 0) return 0;

            var dtStartDate = ((int)startDate).ConvertTSLabDateToDateTime();
            var dtEndDate = ((int)endDate).ConvertTSLabDateToDateTime();

            if (dtStartDate > dtEndDate) return 0;

            var interval = dtEndDate - dtStartDate;
            return IntType switch
            {
                IntervalType.Дней => interval.TotalDays,
                IntervalType.Часов => interval.TotalHours,
                IntervalType.Минут => interval.TotalMinutes,
                _ => 0
            };
        }
    }
}