package financial

import (
	"testing"
)

func TestDefaultConfig(t *testing.T) {
	config := DefaultConfig()

	if config == nil {
		t.Fatal("DefaultConfig() returned nil")
	}

	// Check default values
	if config.DefaultDiscountRate != 0.08 {
		t.Errorf("DefaultDiscountRate = %v, want 0.08", config.DefaultDiscountRate)
	}

	if config.DefaultProjectLife != 10 {
		t.Errorf("DefaultProjectLife = %v, want 10", config.DefaultProjectLife)
	}

	if config.GridEmissionFactor != 0.3 {
		t.Errorf("GridEmissionFactor = %v, want 0.3", config.GridEmissionFactor)
	}

	if config.OpexPctOfCapex != 0.03 {
		t.Errorf("OpexPctOfCapex = %v, want 0.03", config.OpexPctOfCapex)
	}
}

// Config validation not implemented - no Validate method exists

func TestNewCalculator(t *testing.T) {
	config := DefaultConfig()
	calc := NewCalculator(config)

	if calc == nil {
		t.Error("NewCalculator() returned nil")
	}

	// Test that we can call methods
	data := &ResourceFlowData{
		ResourceType: "heat",
		DistanceKm:   10.0,
		AnnualVolume: 1000.0,
		CostIn:       100.0,
		CostOut:      20.0,
	}

	assumptions := &EconomicAssumptions{
		DiscountRate:     0.08,
		ProjectLifeYears: 10,
	}

	result, err := calc.Calculate(AnalysisTypeBasic, data, assumptions)
	if err != nil {
		t.Fatalf("Calculate() error = %v", err)
	}

	if result == nil {
		t.Error("Calculate() returned nil result")
	}
}