package financial

// Config holds all financial calculation configuration
type Config struct {
	// NPV/IRR parameters
	DefaultDiscountRate float64 `json:"default_discount_rate"`
	DefaultProjectLife  int     `json:"default_project_life"`

	// CAPEX estimation parameters (€/km)
	CapexPerKm map[string]float64 `json:"capex_per_km"`

	// Transport cost rates (€/km/unit)
	TransportRates map[string]float64 `json:"transport_rates"`

	// CO2 calculation parameters
	GridEmissionFactor float64 `json:"grid_emission_factor"` // t CO₂/MWh
	HeatEfficiency     float64 `json:"heat_efficiency"`
	UtilizationRate    float64 `json:"utilization_rate"`
	WaterTreatmentKwh  float64 `json:"water_treatment_kwh"` // kWh/m³
	WasteDiversionCo2  float64 `json:"waste_diversion_co2"` // t CO₂/tonne
	CompostCarbonSeq   float64 `json:"compost_carbon_seq"`  // t CO₂/tonne compost

	// OPEX parameters
	OpexPctOfCapex float64 `json:"opex_pct_of_capex"`

	// Sensitivity analysis parameters
	SensitivityVariations []float64 `json:"sensitivity_variations"`

	// Risk assessment parameters
	RiskThresholds RiskThresholds `json:"risk_thresholds"`
}

// RiskThresholds defines risk level boundaries
type RiskThresholds struct {
	Low    float64 `json:"low"`
	Medium float64 `json:"medium"`
	High   float64 `json:"high"`
}

// DefaultConfig returns the default configuration
func DefaultConfig() *Config {
	return &Config{
		DefaultDiscountRate: 0.08, // 8%
		DefaultProjectLife:  10,

		CapexPerKm: map[string]float64{
			"heat":      50000,
			"water":     30000,
			"steam":     60000,
			"CO2":       10000,
			"biowaste":  5000,
			"cooling":   50000,
			"materials": 5000,
			"logistics": 1000,
			"service":   0,
		},

		TransportRates: map[string]float64{
			"heat":      0.0005,
			"water":     0.001,
			"steam":     0.0005,
			"CO2":       0.002,
			"biowaste":  0.003,
			"cooling":   0.0005,
			"materials": 0.002,
			"logistics": 0.001,
			"service":   0.0,
		},

		GridEmissionFactor: 0.3,
		HeatEfficiency:     0.9,
		UtilizationRate:    0.7,
		WaterTreatmentKwh:  1.0,
		WasteDiversionCo2:  0.5,
		CompostCarbonSeq:   0.1,

		OpexPctOfCapex: 0.03,

		SensitivityVariations: []float64{-0.2, -0.1, 0.1, 0.2},

		RiskThresholds: RiskThresholds{
			Low:    0.3,
			Medium: 0.6,
			High:   0.8,
		},
	}
}