using System;
using System.Collections.Generic;

namespace Comal.Classes
{
    public static class EmployeeRosterExtensions
    {
        private static readonly Dictionary<string, Func<IEmployeeRosterItem, TimeSpan>> times = new Dictionary<string, Func<IEmployeeRosterItem, TimeSpan>>()
        {
            { "Start", x => x.Start },
            { "Finish", x => x.Finish },
            { "Break", x => x.Break },
            { "Start2", x => x.Start2 },
            { "Finish2", x => x.Finish2 },
            { "Break2", x => x.Break2 }
        };

        private static double GetTime(IEmployeeRosterItem item, string column, string name, TimeSpan after)
        {
            if (string.Equals(column, name))
                return after.TotalHours;
            return times[column].Invoke(item).TotalHours;
        }

        private static double RecalculateTimes(IEmployeeRosterItem item, string name, TimeSpan after)
        {
            double result = 0.0F;
            result = GetTime(item, "Finish", name, after) - (GetTime(item, "Start", name, after) + GetTime(item, "Break", name, after));
            result = result + GetTime(item, "Finish2", name, after) - (GetTime(item, "Start2", name, after) + GetTime(item, "Break2", name, after));
            return result;
        }

        public static void DoPropertyChanged(this IEmployeeRosterItem item, string name, object? before, object? after)
        {
            if (times.ContainsKey(name) && after is TimeSpan afterTime)
                item.Duration = RecalculateTimes(item, name, afterTime);
        }

        /*public static EmployeeRosterItem[] FromJSON(String? json)
        {
            return !String.IsNullOrWhiteSpace(json)
                ? Serialization.Deserialize<List<EmployeeRosterItem>>(json)?.OrderBy(x => x.Day).ToArray()
                  ?? new EmployeeRosterItem[] { }
                : new EmployeeRosterItem[] { };
        }

        public static String ToJSON(EmployeeRosterItem[] items)
        {
            return Serialization.Serialize(items);
        }*/
    }
}