package services

import (
	"os"
	"testing"

	"go.uber.org/zap"
)

func TestNewGeoIPServiceDisabled(t *testing.T) {
	os.Unsetenv("GEOIP_DB_PATH")
	logger := zap.NewNop()
	svc := NewGeoIPService(logger)
	if svc.IsEnabled() {
		t.Error("expected GeoIP to be disabled when GEOIP_DB_PATH not set")
	}

	country, city := svc.Lookup("1.2.3.4")
	if country != "" || city != "" {
		t.Error("expected empty results when disabled")
	}
}

func TestNewGeoIPServiceMissingDB(t *testing.T) {
	os.Setenv("GEOIP_DB_PATH", "/nonexistent/path.mmdb")
	defer os.Unsetenv("GEOIP_DB_PATH")

	logger := zap.NewNop()
	svc := NewGeoIPService(logger)
	if svc.IsEnabled() {
		t.Error("expected GeoIP to be disabled when DB file doesn't exist")
	}
}

func TestGeoIPLookupPrivateIPs(t *testing.T) {
	// Even if enabled, private IPs should return empty
	svc := &GeoIPService{logger: zap.NewNop(), enabled: true}

	tests := []string{"127.0.0.1", "::1", "192.168.1.1", "10.0.0.1", "0.0.0.0"}
	for _, ip := range tests {
		country, city := svc.Lookup(ip)
		if country != "" || city != "" {
			t.Errorf("expected empty for private IP %s, got country=%q city=%q", ip, country, city)
		}
	}
}

func TestGeoIPLookupInvalidIP(t *testing.T) {
	svc := &GeoIPService{logger: zap.NewNop(), enabled: true}
	country, city := svc.Lookup("not-an-ip")
	if country != "" || city != "" {
		t.Error("expected empty for invalid IP")
	}
}

// TestGeoIPResolverInterface verifies GeoIPService satisfies GeoIPResolver.
func TestGeoIPResolverInterface(t *testing.T) {
	var _ GeoIPResolver = &GeoIPService{}
}