using System;
using System.Collections.Generic;
using InnovEnergy.App.SinexcelCommunication.ESS;

namespace InnovEnergy.App.SinexcelCommunication.AggregationService;

public class HourlyAccumulator
{
    public DateTime HourStart { get; set; }

    public double StartSelfGeneratedElectricity   { get; set; }
    public double StartElectricityPurchased       { get; set; }
    public double StartElectricityFed             { get; set; }
    public double StartBatteryChargeEnergy        { get; set; }
    public double StartBatteryDischargeEnergy     { get; set; }
    public double StartLoadPowerConsumption       { get; set; }

    public double LastSelfGeneratedElectricity    { get; set; }
    public double LastElectricityPurchased        { get; set; }
    public double LastElectricityFed              { get; set; }
    public double LastBatteryChargeEnergy         { get; set; }
    public double LastBatteryDischargeEnergy      { get; set; }
    public double LastLoadPowerConsumption        { get; set; }
}

public static class EnergyAggregation
{
    private static HourlyAccumulator? _currentHourAccumulator;
    private static DateTime? _lastDailySaveDate;


    public static HourlyEnergyData? ProcessHourlyData(StatusRecord statusRecord, DateTime timestamp)
    {
        var r = statusRecord.InverterRecord;
        var hourStart = new DateTime(timestamp.Year, timestamp.Month, timestamp.Day, timestamp.Hour, 0, 0);

        // First call
        if (_currentHourAccumulator == null)
        {
            _currentHourAccumulator = new HourlyAccumulator
            {
                HourStart = hourStart,

                StartSelfGeneratedElectricity = r.SelfGeneratedElectricity,
                StartElectricityPurchased     = r.ElectricityPurchased,
                StartElectricityFed           = r.ElectricityFed,
                StartBatteryChargeEnergy      = r.BatteryChargeEnergy,
                StartBatteryDischargeEnergy   = r.BatteryDischargeEnergy,
                StartLoadPowerConsumption     = r.LoadPowerConsumption,

                LastSelfGeneratedElectricity  = r.SelfGeneratedElectricity,
                LastElectricityPurchased      = r.ElectricityPurchased,
                LastElectricityFed            = r.ElectricityFed,
                LastBatteryChargeEnergy       = r.BatteryChargeEnergy,
                LastBatteryDischargeEnergy    = r.BatteryDischargeEnergy,
                LastLoadPowerConsumption      = r.LoadPowerConsumption
            };

            return null;
        }

        // Still same hour → just update last values
        if (_currentHourAccumulator.HourStart == hourStart)
        {
            _currentHourAccumulator.LastSelfGeneratedElectricity = r.SelfGeneratedElectricity;
            _currentHourAccumulator.LastElectricityPurchased     = r.ElectricityPurchased;
            _currentHourAccumulator.LastElectricityFed           = r.ElectricityFed;
            _currentHourAccumulator.LastBatteryChargeEnergy      = r.BatteryChargeEnergy;
            _currentHourAccumulator.LastBatteryDischargeEnergy   = r.BatteryDischargeEnergy;
            _currentHourAccumulator.LastLoadPowerConsumption     = r.LoadPowerConsumption;

            return null;
        }

        // Hour changed → finalize previous hour
        var completedHour = new HourlyEnergyData
        {
            Timestamp = _currentHourAccumulator.HourStart,

            SelfGeneratedElectricity = SafeDiff(
                _currentHourAccumulator.LastSelfGeneratedElectricity,
                _currentHourAccumulator.StartSelfGeneratedElectricity),

            ElectricityPurchased = SafeDiff(
                _currentHourAccumulator.LastElectricityPurchased,
                _currentHourAccumulator.StartElectricityPurchased),

            ElectricityFed = SafeDiff(
                _currentHourAccumulator.LastElectricityFed,
                _currentHourAccumulator.StartElectricityFed),

            BatteryChargeEnergy = SafeDiff(
                _currentHourAccumulator.LastBatteryChargeEnergy,
                _currentHourAccumulator.StartBatteryChargeEnergy),

            BatteryDischargeEnergy = SafeDiff(
                _currentHourAccumulator.LastBatteryDischargeEnergy,
                _currentHourAccumulator.StartBatteryDischargeEnergy),

            LoadPowerConsumption = SafeDiff(
                _currentHourAccumulator.LastLoadPowerConsumption,
                _currentHourAccumulator.StartLoadPowerConsumption)
        };

        // Start new hour with current sample
        _currentHourAccumulator = new HourlyAccumulator
        {
            HourStart = hourStart,

            StartSelfGeneratedElectricity = r.SelfGeneratedElectricity,
            StartElectricityPurchased     = r.ElectricityPurchased,
            StartElectricityFed           = r.ElectricityFed,
            StartBatteryChargeEnergy      = r.BatteryChargeEnergy,
            StartBatteryDischargeEnergy   = r.BatteryDischargeEnergy,
            StartLoadPowerConsumption     = r.LoadPowerConsumption,

            LastSelfGeneratedElectricity  = r.SelfGeneratedElectricity,
            LastElectricityPurchased      = r.ElectricityPurchased,
            LastElectricityFed            = r.ElectricityFed,
            LastBatteryChargeEnergy       = r.BatteryChargeEnergy,
            LastBatteryDischargeEnergy    = r.BatteryDischargeEnergy,
            LastLoadPowerConsumption      = r.LoadPowerConsumption
        };

        return completedHour;
    }

    public static DailyEnergyData? TryCreateDailyData(StatusRecord statusRecord, DateTime timestamp)
    {
        if (timestamp is { Hour: 23, Minute: 59 })
        {
            if (_lastDailySaveDate != timestamp.Date)
            {
                _lastDailySaveDate = timestamp.Date;

                var r = statusRecord.InverterRecord;

                return new DailyEnergyData
                {
                    Timestamp = timestamp,

                    DailySelfGeneratedElectricity   = r.DailySelfGeneratedElectricity,
                    DailyElectricityPurchased       = r.DailyElectricityPurchased,
                    DailyElectricityFed             = r.DailyElectricityFed,
                    BatteryDailyChargeEnergy        = r.BatteryDailyChargeEnergy,
                    BatteryDailyDischargeEnergy     = r.BatteryDailyDischargeEnergy,
                    DailyLoadPowerConsumption       = r.DailyLoadPowerConsumption
                };
            }
        }

        return null;
    }

    private static double SafeDiff(double endValue, double startValue)
    {
        var diff = endValue - startValue;
        return diff < 0 ? 0 : diff;
    }
}