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
`

		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 be overridden by config file

		// Values from config file should be used
		assert.Equal(t, "testhost", cfg.Server.Host)
		assert.Equal(t, 1234, cfg.Server.Port, "port from config file should override parameter")
		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")
	})
}