using Microsoft.EntityFrameworkCore;
using PARR.DAL.Context;
using PARR.DAL.Contracts;
using PARR.DAL.Models.Schedule;
using PARR.DAL.Services.Interfaces.Schedule;

namespace PARR.DAL.Services.Implementations.Schedule
{
    internal sealed class ScheduleResponseAreaTimeOffsetService : IScheduleResponseAreaTimeOffsetService
    {
        private readonly IReadOnlyDictionary<string, ScheduleResponseAreaTimeOffset> offsetList;
        /// <summary>
        /// ЗО по умолчанию
        /// </summary>
        private readonly string defaultResponseArea;
        /// <summary>
        /// Настройки, если не нашли в offsetList
        /// </summary>
        private readonly ScheduleResponseAreaTimeOffset defaultOffset;

        public ScheduleResponseAreaTimeOffsetService(DataContext dataContext, SettingsFromDb settingsFromDb)
        {
            offsetList = dataContext.ScheduleResponseAreaTimeOffsets
                .AsNoTracking()
                .ToDictionary(t => t.ResponseArea, t => t, StringComparer.OrdinalIgnoreCase);

            if (string.IsNullOrEmpty(settingsFromDb.DefaultResponseAreaToTimeOffset))
                defaultResponseArea = "17-МСК";
            else
                defaultResponseArea = settingsFromDb.DefaultResponseAreaToTimeOffset;


            defaultOffset = new ScheduleResponseAreaTimeOffset
            {
                ResponseArea = "17-МСК",
                EsppValue = "",
                UtcTimeOffset = new TimeSpan(3, 0, 0)
            };
        }


        public IReadOnlyDictionary<string, ScheduleResponseAreaTimeOffset> GetAll => offsetList;

        public ScheduleResponseAreaTimeOffset GetDefault => GetByResponseAreaOrDefault(defaultResponseArea);

        public ScheduleResponseAreaTimeOffset GetByResponseAreaOrDefault(string responseArea)
        {
            return offsetList.TryGetValue(responseArea, out var value) ? value : defaultOffset;
        }


        //public IQueryable<ScheduleResponseAreaTimeOffset> Get()
        //{
        //    return dataContext.ScheduleResponseAreaTimeOffsets;
        //}

        //public async Task<string?> GetTimeOffsetByResponseAreaAsync(string responseArea)
        //{
        //    var result = await dataContext.ScheduleResponseAreaTimeOffsets.FirstOrDefaultAsync(t => t.ResponseArea == responseArea);

        //    return result != null ? result.TimeOffset : null;
        //}
    }
}