class ImpactsTracker:
    """Simple tracker for environmental impacts"""
    
    def __init__(self):
        self.reset()
    
    def reset(self):
        """Reset all counters to zero"""
        self.total_energy = 0.0
        self.total_carbon = 0.0  # GWP in CO2 equivalent
        self.generation_count = 0
        self.last_energy = 0.0
        self.last_carbon = 0.0
    
    def add_impact(self, impacts):
        """Add new impact data from API response"""
        # Calculate energy impact (use average of min/max)
        energy_impact = (impacts.energy.value.min + impacts.energy.value.max) / 2
        
        # Calculate carbon impact (use average of min/max)
        carbon_impact = (impacts.gwp.value.min + impacts.gwp.value.max) / 2
        
        # Store last impact for display
        self.last_energy = energy_impact
        self.last_carbon = carbon_impact
        
        # Add to totals
        self.total_energy += energy_impact
        self.total_carbon += carbon_impact
        self.generation_count += 1
    
    def get_summary(self):
        """Get a simple summary of impacts"""
        return {
            'last_energy': self.last_energy,
            'last_carbon': self.last_carbon,
            'total_energy': self.total_energy,
            'total_carbon': self.total_carbon,
            'generation_count': self.generation_count
        }