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

namespace GreenHome.Infrastructure.Services.Alert;

public sealed class AlertConditionService : IAlertConditionService
{
    private readonly GreenHomeDbContext _dbContext;
    private readonly IMapper _mapper;

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

    public async Task<IReadOnlyList<AlertConditionDto>> GetByDeviceIdAsync(int deviceId, CancellationToken cancellationToken)
    {
        var conditions = await _dbContext.AlertConditions
            .Include(x => x.Device)
            .Include(x => x.Rules)
            .Where(x => x.DeviceId == deviceId)
            .OrderByDescending(x => x.CreatedAt)
            .AsNoTracking()
            .ToListAsync(cancellationToken);

        return _mapper.Map<List<AlertConditionDto>>(conditions);
    }

    public async Task<AlertConditionDto?> GetByIdAsync(int id, CancellationToken cancellationToken)
    {
        var condition = await _dbContext.AlertConditions
            .Include(x => x.Device)
            .Include(x => x.Rules)
            .AsNoTracking()
            .FirstOrDefaultAsync(x => x.Id == id, cancellationToken);

        return condition != null ? _mapper.Map<AlertConditionDto>(condition) : null;
    }

    public async Task<int> CreateAsync(CreateAlertConditionRequest request, CancellationToken cancellationToken)
    {
        var condition = new Domain.AlertCondition
        {
            DeviceId = request.DeviceId,
            NotificationType = request.NotificationType,
            TimeType = request.TimeType,
            CallCooldownMinutes = request.CallCooldownMinutes,
            SmsCooldownMinutes = request.SmsCooldownMinutes,
            IsEnabled = request.IsEnabled,
            CreatedAt = DateTime.UtcNow,
            UpdatedAt = DateTime.UtcNow
        };

        var rules = _mapper.Map<List<Domain.AlertRule>>(request.Rules);
        foreach (var rule in rules)
        {
            condition.Rules.Add(rule);
        }

        _dbContext.AlertConditions.Add(condition);
        await _dbContext.SaveChangesAsync(cancellationToken);

        return condition.Id;
    }

    public async Task UpdateAsync(UpdateAlertConditionRequest request, CancellationToken cancellationToken)
    {
        var condition = await _dbContext.AlertConditions
            .Include(x => x.Rules)
            .FirstOrDefaultAsync(x => x.Id == request.Id, cancellationToken);

        if (condition == null)
            throw new InvalidOperationException($"Alert condition not found: {request.Id}");

        condition.NotificationType = request.NotificationType;
        condition.TimeType = request.TimeType;
        condition.CallCooldownMinutes = request.CallCooldownMinutes;
        condition.SmsCooldownMinutes = request.SmsCooldownMinutes;
        condition.IsEnabled = request.IsEnabled;
        condition.UpdatedAt = DateTime.UtcNow;

        _dbContext.AlertRules.RemoveRange(condition.Rules);
        condition.Rules.Clear();

        var newRules = _mapper.Map<List<Domain.AlertRule>>(request.Rules);
        foreach (var rule in newRules)
        {
            condition.Rules.Add(rule);
        }

        await _dbContext.SaveChangesAsync(cancellationToken);
    }

    public async Task DeleteAsync(int id, CancellationToken cancellationToken)
    {
        var condition = await _dbContext.AlertConditions
            .FirstOrDefaultAsync(x => x.Id == id, cancellationToken);

        if (condition == null)
            throw new InvalidOperationException($"Alert condition not found: {id}");

        _dbContext.AlertConditions.Remove(condition);
        await _dbContext.SaveChangesAsync(cancellationToken);
    }

    public async Task<bool> ToggleEnabledAsync(int id, bool isEnabled, CancellationToken cancellationToken)
    {
        var condition = await _dbContext.AlertConditions
            .FirstOrDefaultAsync(x => x.Id == id, cancellationToken);

        if (condition == null)
            return false;

        condition.IsEnabled = isEnabled;
        condition.UpdatedAt = DateTime.UtcNow;

        await _dbContext.SaveChangesAsync(cancellationToken);
        return true;
    }

    public async Task<IReadOnlyList<RelayConditionDto>> GetRelayConditionsAsync(int deviceId, CancellationToken cancellationToken)
    {
        var conditions = await _dbContext.AlertConditions
            .Include(x => x.Rules)
            .Where(x => x.DeviceId == deviceId && (int)x.NotificationType > 0)
            .OrderByDescending(x => x.CreatedAt)
            .AsNoTracking()
            .ToListAsync(cancellationToken);

        var result = conditions.Select(c => new RelayConditionDto
        {
            Enabled = c.IsEnabled ? 1 : 0,
            TimeType = (int)c.TimeType,
            Relay = "R" + (int)c.NotificationType,
            Rules = c.Rules.OrderBy(r => r.Order).Select(r => new RelayRuleDto
            {
                Sensor = ((int)r.SensorType).ToString(),
                Op = ((int)r.ComparisonType).ToString(),
                V1 = r.Value1,
                V2 = r.Value2
            }).ToList()
        }).ToList();

        return result;
    }

    public async Task<IReadOnlyList<RelayConditionDto>> GetUpdatedRelayConditionsAsync(int deviceId, DateTime? lastUpdateDate, CancellationToken cancellationToken)
    {
        if (lastUpdateDate == null)
            return await GetRelayConditionsAsync(deviceId, cancellationToken);

        var hasUpdates = await _dbContext.AlertConditions
            .AnyAsync(x => x.DeviceId == deviceId && (int)x.NotificationType > 0 && x.UpdatedAt > lastUpdateDate, cancellationToken);

        if (!hasUpdates)
            return Array.Empty<RelayConditionDto>();

        return await GetRelayConditionsAsync(deviceId, cancellationToken);
    }

    public async Task<bool> HasUpdatedConditionsAsync(int deviceId, DateTime? lastUpdateDate, CancellationToken cancellationToken)
    {
        if (lastUpdateDate == null) return true;

        return await _dbContext.AlertConditions
            .AnyAsync(x => x.DeviceId == deviceId && (int)x.NotificationType > 0 && x.UpdatedAt > lastUpdateDate, cancellationToken);
    }
}