package logging

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

func TestNewWritesStructuredLog(t *testing.T) {
	var output bytes.Buffer
	logger := New(&output)
	logger.Info("test event", "component", "test")

	value := output.String()
	if !strings.Contains(value, `"msg":"test event"`) || !strings.Contains(value, `"component":"test"`) {
		t.Fatalf("log output = %q", value)
	}
}

func TestNewNilWriterDoesNotPanic(t *testing.T) {
	New(nil).Info("discarded")
}

func TestOpenFileWritesInsideConfiguredDirectory(t *testing.T) {
	directory := filepath.Join(t.TempDir(), "logs")
	logger, closer, err := OpenFile(directory)
	if err != nil {
		t.Fatal(err)
	}
	logger.Info("file event")
	if err := closer.Close(); err != nil {
		t.Fatal(err)
	}
	contents, err := os.ReadFile(filepath.Join(directory, "chub.log"))
	if err != nil || !strings.Contains(string(contents), `"msg":"file event"`) {
		t.Fatalf("log contents = %q, error = %v", contents, err)
	}
}