package utils

import (
	"testing"

	"gophergate/internal/models"
)

func TestCalculateCost_NotFound(t *testing.T) {
	r := &models.ModelRegistry{Providers: make(map[string]models.ProviderInfo)}
	cost := CalculateCost(r, "unknown-model", 100, 50, 0, 0, 0)
	if cost != 0.0 {
		t.Fatalf("expected 0 cost for unknown model, got %f", cost)
	}
}

func TestCalculateCost_KnownModel(t *testing.T) {
	inputCost := 2.5   // $2.50 per 1M tokens
	outputCost := 10.0 // $10.00 per 1M tokens
	r := &models.ModelRegistry{
		Providers: map[string]models.ProviderInfo{
			"openai": {
				Models: map[string]models.ModelMetadata{
					"gpt-4o": {
						Cost: &models.ModelCost{
							Input:  inputCost,
							Output: outputCost,
						},
					},
				},
			},
		},
	}

	cost := CalculateCost(r, "gpt-4o", 1000, 500, 0, 0, 0)
	expected := (1000 * inputCost / 1000000.0) + (500 * outputCost / 1000000.0)
	if cost != expected {
		t.Fatalf("expected %f, got %f", expected, cost)
	}
}