using System.Linq.Expressions;

using VberZero.BaseSystem;

namespace VberZero.DomainService.Calendar;

public class NullCalendarManger : ICalendarManger
{
    private static NullCalendarManger _instance;
    public static NullCalendarManger Instance => _instance ??= new NullCalendarManger();

    public NullCalendarManger()
    {
        var date = DateTime.Today;
        int y = date.Year, m = date.Month, d = date.Day;
        _calendars = new List<SysCalendar>(new List<SysCalendar>()
        {
            new SysCalendar()
            {
                Id = 1, Title = "Demo01", Description = "----Demo01----", Colors = "#fff|#28a745|#28a745",
                Start = new DateTime(y, m, d, 12, 0, 0).AddDays(4), End = new DateTime(y, m, d, 16, 0, 0).AddDays(4)
            },
            new SysCalendar()
            {
                Id = 2, Title = "Demo02", Description = "----Demo02----", Colors = "#333|#fd7e14|#fd7e14",
                Start = new DateTime(y, m, d, 8, 30, 0).AddDays(2), End = new DateTime(y, m, d, 10, 0, 0).AddDays(2)
            },
            new SysCalendar()
            {
                Id = 3, Title = "Demo03", Description = "----Demo03----", Colors = "#fff|#dc3545|#dc3545",
                Start = new DateTime(y, m, d, 9, 30, 0).AddDays(-3),
                End = new DateTime(y, m, d, 10, 0, 0).AddDays(-2)
            },
            new SysCalendar()
            {
                Id = 4, Title = "Demo04", Description = "----Demo04----", Colors = "#fff|#007bff|#007bff",
                Start = new DateTime(y, m, d).AddDays(4), End = new DateTime(y, m, d).AddDays(13)
            },
            new SysCalendar()
            {
                Id = 5, Title = "Demo05", Description = "----Demo05----", Colors = "#333|#ffc107|#ffc107",
                Start = new DateTime(y, m, d).AddDays(8), AllDay = true
            },
            new SysCalendar()
            {
                Id = 6, Title = "Demo06", Description = "----Demo06----", Colors = "#fff|#e83e8c|#e83e8c",
                Start = new DateTime(y, m, d).AddDays(-4), AllDay = true
            },
            new SysCalendar()
            {
                Id = 7, Title = "Demo07", Description = "----Demo07----", Colors = "#fff|#dc3545|#dc3545",
            },
            new SysCalendar()
            {
                Id = 8, Title = "Demo08", Description = "----Demo08----", Colors = "#333|#ffc107|#ffc107",
            },
            new SysCalendar()
            {
                Id = 9, Title = "Demo09", Description = "----Demo09----", Colors = "#fff|#28a745|#28a745",
            }
        });
    }

    private static List<SysCalendar> _calendars = new List<SysCalendar>();

    public Task<List<SysCalendar>> GetAllList()
    {
        throw new NotImplementedException();
    }

    public Task<List<SysCalendar>> GetAllList(Expression<Func<SysCalendar, bool>> expression)
    {
        return Task.FromResult(_calendars.Where(a => a.Start != null).ToList());
    }

    public Task<List<SysCalendar>> GetNotStartList()
    {
        return Task.FromResult(_calendars.Where(a => a.Start == null).ToList());
    }

    public Task<SysCalendar> GetById(int id)
    {
        return Task.FromResult(_calendars.FirstOrDefault(a => a.Id == id));
    }

    public Task<SysCalendar> Create(SysCalendar info)
    {
        info.Id = (int)(DateTime.Now.Ticks);
        _calendars.Add(info);
        return Task.FromResult(info);
    }

    public async Task<SysCalendar> Update(SysCalendar info)
    {
        await Delete(info.Id);
        return await Create(info);
    }

    public async Task<SysCalendar> CreateOrUpdate(SysCalendar info)
    {
        if (info.Id != 0)
        {
            await Delete(info.Id);
        }
        else
        {
            info.Id = (int)(DateTime.Now.Ticks);
        }
        _calendars.Add(info);
        return info;
    }

    public Task Delete(int id)
    {
        var old = _calendars.FirstOrDefault(a => a.Id == id);
        if (old != null)
        {
            _calendars.Remove(old);
        }
        return Task.CompletedTask;
    }
}