package geospatial

import (
	"testing"
)

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

	if config.EarthRadiusKm != 6371.0 {
		t.Errorf("DefaultConfig() EarthRadiusKm = %v, want 6371.0", config.EarthRadiusKm)
	}

	if config.DefaultDistanceMethod != "haversine" {
		t.Errorf("DefaultConfig() DefaultDistanceMethod = %v, want haversine", config.DefaultDistanceMethod)
	}

	if config.DefaultCoordinateSystem != WGS84 {
		t.Errorf("DefaultConfig() DefaultCoordinateSystem = %v, want WGS84", config.DefaultCoordinateSystem)
	}
}

func TestConfig_Validate(t *testing.T) {
	tests := []struct {
		name    string
		config  *Config
		wantErr bool
	}{
		{
			name:    "Valid config",
			config:  DefaultConfig(),
			wantErr: false,
		},
		{
			name: "Invalid earth radius",
			config: &Config{
				EarthRadiusKm: -1,
			},
			wantErr: true,
		},
		{
			name: "Invalid latitude range",
			config: &Config{
				EarthRadiusKm: 6371.0,
				MaxLatitude:   50.0,
				MinLatitude:   60.0, // Max < Min
			},
			wantErr: true,
		},
		{
			name: "Invalid longitude range",
			config: &Config{
				EarthRadiusKm: 6371.0,
				MaxLongitude:  -10.0,
				MinLongitude:  10.0, // Max < Min
			},
			wantErr: true,
		},
		{
			name: "Invalid distance method",
			config: &Config{
				EarthRadiusKm:         6371.0,
				DefaultDistanceMethod: "invalid",
			},
			wantErr: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			err := tt.config.Validate()
			if (err != nil) != tt.wantErr {
				t.Errorf("Config.Validate() error = %v, wantErr %v", err, tt.wantErr)
			}
		})
	}
}