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package grpclog

import (
	"context"
	"flag"
	"log/slog"
	"os"
	"testing"

	"github.com/googleapis/gax-go/v2/internallog/internal"
	"github.com/googleapis/gax-go/v2/internallog/internal/bookpb"
	"github.com/googleapis/gax-go/v2/internallog/internal/logtest"
	"google.golang.org/grpc/metadata"
)

// To update conformance tests in this package run `go test -update_golden`
func TestMain(m *testing.M) {
	flag.Parse()
	os.Exit(m.Run())
}

func TestLog_protoMessageRequest(t *testing.T) {
	golden := "request.log"
	t.Setenv(internal.LoggingLevelEnvVar, "debug")
	logger, f := setupLogger(t, golden)
	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs("foo", "bar"))
	book := &bookpb.Book{
		Title:  "The book",
		Author: "The author",
	}
	logger.DebugContext(ctx, "msg", "request", ProtoMessageRequest(ctx, book))
	f.Close()
	logtest.DiffTest(t, f.Name(), golden)
}

func TestLog_protoMessageResponse(t *testing.T) {
	golden := "response.log"
	t.Setenv(internal.LoggingLevelEnvVar, "debug")
	logger, f := setupLogger(t, golden)
	ctx := context.Background()
	book := &bookpb.Book{
		Title:  "The book",
		Author: "The author",
	}
	logger.DebugContext(ctx, "msg", "response", ProtoMessageResponse(book))
	f.Close()
	logtest.DiffTest(t, f.Name(), golden)
}

func setupLogger(t *testing.T, golden string) (*slog.Logger, *os.File) {
	t.Helper()
	f, err := os.CreateTemp(t.TempDir(), golden)
	if err != nil {
		t.Fatal(err)
	}
	logger := internal.NewLoggerWithWriter(f)
	return logger, f
}