// Package testdata provides utilities and test data for testing the GeoIP API service.
//
// This package contains helper functions for creating test databases, managing test files,
// and providing sample IP addresses with expected results for comprehensive testing.
package testdata

import (
	"os"
	"path/filepath"
	"testing"
)

// TestDBPath returns the relative path to the testdata directory
// where test database files are stored.
func TestDBPath() string {
	return filepath.Join("testdata")
}

// CreateTempTestDB creates a temporary test database file with minimal MMDB format headers.
// It returns the path to the temporary directory containing the test database.
// The created file contains basic MaxMind DB format magic bytes for testing file operations.
func CreateTempTestDB(t *testing.T, filename string) string {
	t.Helper()
	
	tempDir := t.TempDir()
	dbPath := filepath.Join(tempDir, filename)
	
	// Create a minimal valid MMDB file header (this is just for testing file operations)
	// In real tests, we'd use actual MaxMind test database files
	content := []byte{
		0xab, 0xcd, 0xef, // Magic bytes for MaxMind DB format
		0x01, 0x00, 0x00, 0x00, // Version
	}
	
	err := os.WriteFile(dbPath, content, 0644)
	if err != nil {
		t.Fatalf("Failed to create test database: %v", err)
	}
	
	return tempDir
}

// TestIPs maps test IP addresses to their expected ISO country codes.
// This includes both IPv4 and IPv6 addresses, as well as special cases
// like localhost and private IPs that should be handled gracefully.
var TestIPs = map[string]string{
	"8.8.8.8":       "US", // Google DNS
	"1.1.1.1":       "US", // Cloudflare DNS
	"199.43.0.43":   "US", // Test IP used in health check
	"127.0.0.1":     "",   // Localhost - should handle gracefully
	"192.168.1.1":   "",   // Private IP - should handle gracefully
	"2001:4860:4860::8888": "US", // Google IPv6 DNS
}

// InvalidIPs contains a list of invalid IP address strings for testing error handling.
// These include empty strings, malformed addresses, and non-IP text that should
// cause parsing errors in the GeoIP lookup functions.
var InvalidIPs = []string{
	"",
	"invalid",
	"256.256.256.256",
	"1.2.3",
	"not.an.ip",
}