public string Produce()
    {
        double neededEnergy = 0;
        double oreProducedCurrentDay = 0;

        var fullModeEnergyRequirement = this.harvesters.Sum(h => h.EnergyRequirement);
        var fullModeOreProductoin = this.harvesters.Sum(h => h.OreOutput);

        switch (this.Mode)
        {
            case FullMode:
                neededEnergy = fullModeEnergyRequirement;
                oreProducedCurrentDay = fullModeOreProductoin;
                break;
            case HalfMode:
                var halfModeEnergyRequirement = fullModeEnergyRequirement * HalfEnergyRequirementPrecentage;
                var halfModeOreProduction = fullModeOreProductoin * HalfEnergyRequirementPrecentage;

                neededEnergy = halfModeEnergyRequirement;
                oreProducedCurrentDay = halfModeOreProduction;
                break;
            case EnergyMode:
                var energyModeRequirement = fullModeEnergyRequirement * EnergyRequirementPrecentage;
                var energyModeOreProduction = fullModeOreProductoin * EnergyRequirementPrecentage;

                neededEnergy = energyModeRequirement;
                oreProducedCurrentDay = energyModeOreProduction;
                break;
        }

        if (this.energyRepository.TakeEnergy(neededEnergy))
        {
            this.OreProduced += oreProducedCurrentDay;
            return string.Format(Constants.OreProductionCurrentDay, oreProducedCurrentDay);
        }
        return string.Format(Constants.OreProductionCurrentDay, NotEnoghtEnergyProductionValue);
    }