package testserver

import (
	"os"
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestCreateTestConfig(t *testing.T) {
	// Test 1: Default config (no test config file)
	t.Run("DefaultConfig", func(t *testing.T) {
		cfg := createTestConfig(9999)

		assert.Equal(t, "localhost", cfg.Server.Host)
		assert.Equal(t, 9999, cfg.Server.Port)
		assert.Equal(t, true, cfg.API.V2Enabled, "v2 should be enabled by default")
		assert.Equal(t, "default-secret-key-please-change-in-production", cfg.Auth.JWTSecret)
		assert.Equal(t, "admin123", cfg.Auth.AdminMasterPassword)
		assert.Equal(t, "dance_lessons_coach_bdd_test", cfg.Database.Name)
	})

	// Test 2: Config with environment variable override should NOT affect test config
	t.Run("EnvironmentVariableIsolation", func(t *testing.T) {
		// Set environment variables that would normally override config
		os.Setenv("DLC_API_V2_ENABLED", "false")
		os.Setenv("DLC_AUTH_JWT_SECRET", "env-secret")
		defer func() {
			os.Unsetenv("DLC_API_V2_ENABLED")
			os.Unsetenv("DLC_AUTH_JWT_SECRET")
		}()

		cfg := createTestConfig(8888)

		// These should NOT be affected by environment variables
		assert.Equal(t, true, cfg.API.V2Enabled, "v2 should still be enabled despite env var")
		assert.Equal(t, "default-secret-key-please-change-in-production", cfg.Auth.JWTSecret, "should use default secret, not env var")
	})

	// Test 3: Test config file loading
	t.Run("TestConfigFileLoading", func(t *testing.T) {
		// Create a temporary test config file
		testConfig := `server:
  host: testhost
  port: 1234
api:
  v2_enabled: false
auth:
  jwt_secret: test-secret
  admin_master_password: test-admin
database:
  name: test_db
`

		tempFile := "test-config-test.yaml"
		if err := os.WriteFile(tempFile, []byte(testConfig), 0644); err != nil {
			t.Fatal("Failed to create test config file:", err)
		}
		defer os.Remove(tempFile)

		// Set FEATURE env to trigger config file loading
		os.Setenv("FEATURE", "test")
		defer os.Unsetenv("FEATURE")

		// Create a feature-specific config file that points to our test file
		featureConfigDir := "features/test"
		os.MkdirAll(featureConfigDir, 0755)
		defer os.RemoveAll(featureConfigDir)

		if err := os.Symlink("../../"+tempFile, featureConfigDir+"/test-test-config.yaml"); err != nil {
			t.Fatal("Failed to create symlink:", err)
		}
		defer os.Remove(featureConfigDir + "/test-test-config.yaml")

		cfg := createTestConfig(7777) // This port should override config file port

		// Values from config file should be used, except port which is overridden by parameter
		assert.Equal(t, "testhost", cfg.Server.Host)
		assert.Equal(t, 7777, cfg.Server.Port, "parameter port should override config file port")
		assert.Equal(t, false, cfg.API.V2Enabled, "v2_enabled from config file should be used")
		assert.Equal(t, "test-secret", cfg.Auth.JWTSecret, "jwt_secret from config file should be used")
		assert.Equal(t, "test-admin", cfg.Auth.AdminMasterPassword, "admin_master_password from config file should be used")
		assert.Equal(t, "test_db", cfg.Database.Name, "database name from config file should be used")
	})
}