package greeter_test

import (
	"testing"

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

	"github.com/your-org/go-template/internal/greeter"
	"github.com/your-org/go-template/internal/logger"
)

// ── Service (unit tests) ──────────────────────────────────────────────────────

func TestGreet(t *testing.T) {
	svc := greeter.New(logger.NewNop())

	t.Run("returns personalised greeting", func(t *testing.T) {
		msg, err := svc.Greet("World")
		require.NoError(t, err)
		assert.Equal(t, "Hello, World!", msg)
	})

	t.Run("rejects empty name", func(t *testing.T) {
		_, err := svc.Greet("")
		require.Error(t, err)
		assert.Contains(t, err.Error(), "name must not be empty")
	})
}

// ── Mock usage example ────────────────────────────────────────────────────────
// The mock lives in mocks/greeter/mock_greeter.go and is generated by:
//
//	make mocks
//
// This test shows how a *consumer* of the Greeter interface would use the mock.
// It lives here only for proximity to the interface definition — in a real
// project, consumer packages write their own tests with the mock.

func TestMockUsageExample(t *testing.T) {
	// Import path when used in another package:
	//   mocks "github.com/your-org/go-template/mocks/greeter"
	//
	// mock := mocks.NewMockGreeter(t)
	// mock.EXPECT().Greet("Alice").Return("Hello, Alice!", nil)
	//
	// result, err := someConsumer(mock)
	// require.NoError(t, err)
	// assert.Equal(t, "Hello, Alice!", result)
	t.Skip("mock usage — see comment above for pattern")
}