using AutoMapper;
using GreenHome.Application;
using GreenHome.Infrastructure.Data;
using Microsoft.EntityFrameworkCore;

namespace GreenHome.Infrastructure.Services.Device;

public sealed class DeviceSettingsService : IDeviceSettingsService
{
    private readonly GreenHomeDbContext _dbContext;
    private readonly IMapper _mapper;

    public DeviceSettingsService(GreenHomeDbContext dbContext, IMapper mapper)
    {
        _dbContext = dbContext;
        _mapper = mapper;
    }

    public async Task<DeviceSettingsDto?> GetByDeviceIdAsync(int deviceId, CancellationToken cancellationToken)
    {
        var settings = await _dbContext.DeviceSettings
            .Include(x => x.Device)
            .Include(x => x.Relays)
                .ThenInclude(r => r.Rules)
            .AsNoTracking()
            .FirstOrDefaultAsync(x => x.DeviceId == deviceId, cancellationToken);

        if (settings == null)
            return null;

        var dto = _mapper.Map<DeviceSettingsDto>(settings);
        OrderRelays(dto);
        return dto;
    }

    public async Task<int> CreateAsync(DeviceSettingsDto dto, CancellationToken cancellationToken)
    {
        var entity = _mapper.Map<Domain.DeviceSettings>(dto);
        entity.CreatedAt = DateTime.UtcNow;
        entity.UpdatedAt = DateTime.UtcNow;

        SyncRelays(entity, dto.Relays ?? new List<DeviceRelayDto>());

        _dbContext.DeviceSettings.Add(entity);
        await _dbContext.SaveChangesAsync(cancellationToken);
        return entity.Id;
    }

    public async Task UpdateAsync(DeviceSettingsDto dto, CancellationToken cancellationToken)
    {
        var entity = await _dbContext.DeviceSettings
            .Include(x => x.Relays)
                .ThenInclude(r => r.Rules)
            .FirstOrDefaultAsync(x => x.DeviceId == dto.DeviceId, cancellationToken);

        if (entity == null)
            throw new InvalidOperationException($"Device settings not found for device ID {dto.DeviceId}");

        _mapper.Map(dto, entity);
        entity.UpdatedAt = DateTime.UtcNow;

        SyncRelays(entity, dto.Relays ?? new List<DeviceRelayDto>());

        await _dbContext.SaveChangesAsync(cancellationToken);
    }

    private static void OrderRelays(DeviceSettingsDto dto)
    {
        if (dto.Relays == null)
            return;

        dto.Relays = dto.Relays
            .OrderBy(r => r.RelayIndex)
            .ToList();

        foreach (var relay in dto.Relays)
        {
            relay.Rules = relay.Rules?
                .OrderBy(r => r.Order)
                .ToList() ?? new List<DeviceRelayRuleDto>();
        }
    }

    private static void SyncRelays(Domain.DeviceSettings entity, List<DeviceRelayDto> relayDtos)
    {
        var now = DateTime.UtcNow;
        var dtoIndexes = relayDtos.Select(r => r.RelayIndex).ToHashSet();

        // حذف رله‌هایی که دیگر در لیست نیستند
        foreach (var relay in entity.Relays.Where(r => !dtoIndexes.Contains(r.RelayIndex)).ToList())
        {
            entity.Relays.Remove(relay);
        }

        foreach (var dto in relayDtos)
        {
            var relay = entity.Relays.FirstOrDefault(r => r.RelayIndex == dto.RelayIndex);
            if (relay == null)
            {
                relay = new Domain.DeviceRelay
                {
                    RelayIndex = dto.RelayIndex,
                    CreatedAt = now
                };
                entity.Relays.Add(relay);
            }

            relay.Name = dto.Name ?? string.Empty;
            relay.IsEnabled = dto.IsEnabled;
            relay.RelayKind = dto.RelayKind;
            relay.Mode = dto.Mode;
            relay.MinOnMinutes = dto.MinOnMinutes;
            relay.MinOffMinutes = dto.MinOffMinutes;
            relay.UpdatedAt = now;

            SyncRules(relay, dto.Rules ?? new List<DeviceRelayRuleDto>());
        }
    }

    private static void SyncRules(Domain.DeviceRelay relay, List<DeviceRelayRuleDto> ruleDtos)
    {
        relay.Rules.Clear();

        foreach (var dto in ruleDtos.OrderBy(r => r.Order))
        {
            relay.Rules.Add(new Domain.RelayRule
            {
                SensorType = dto.SensorType,
                ComparisonType = dto.ComparisonType,
                Value1 = dto.Value1,
                Value2 = dto.Value2,
                Action = dto.Action,
                TimeType = dto.TimeType,
                Order = dto.Order
            });
        }
    }
}