// Copyright 2015 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package vtracelib_test

import (
	"io"
	"testing"

	"v.io/v23"
	s_vtrace "v.io/v23/services/vtrace"
	"v.io/v23/vtrace"
	"v.io/x/ref/services/internal/vtracelib"
	"v.io/x/ref/test"

	_ "v.io/x/ref/runtime/factories/generic"
)

//go:generate v23 test generate

func TestVtraceServer(t *testing.T) {
	ctx, shutdown := test.V23Init()
	defer shutdown()

	server, err := v23.NewServer(ctx)
	if err != nil {
		t.Fatalf("Could not create server: %s", err)
	}
	endpoints, err := server.Listen(v23.GetListenSpec(ctx))
	if err != nil {
		t.Fatalf("Listen failed: %s", err)
	}
	if err := server.Serve("", vtracelib.NewVtraceService(), nil); err != nil {
		t.Fatalf("Serve failed: %s", err)
	}

	sctx, span := vtrace.WithNewSpan(ctx, "The Span")
	vtrace.ForceCollect(sctx)
	span.Finish()
	id := span.Trace()

	client := s_vtrace.StoreClient(endpoints[0].Name())

	sctx, _ = vtrace.WithNewTrace(sctx)
	trace, err := client.Trace(sctx, id)
	if err != nil {
		t.Fatalf("Unexpected error getting trace: %s", err)
	}
	if len(trace.Spans) != 1 {
		t.Errorf("Returned trace should have 1 span, found %#v", trace)
	}
	if trace.Spans[0].Name != "The Span" {
		t.Errorf("Returned span has wrong name: %#v", trace)
	}

	sctx, _ = vtrace.WithNewTrace(sctx)
	call, err := client.AllTraces(sctx)
	if err != nil {
		t.Fatalf("Unexpected error getting traces: %s", err)
	}
	ntraces := 0
	stream := call.RecvStream()
	var tr *vtrace.TraceRecord
	for stream.Advance() {
		trace := stream.Value()
		if trace.Id == id {
			tr = &trace
		}
		ntraces++
	}
	if err = stream.Err(); err != nil && err != io.EOF {
		t.Fatalf("Unexpected error reading trace stream: %s", err)
	}
	if ntraces != 1 {
		t.Fatalf("Expected 1 trace, got %#v", ntraces)
	}
	if tr == nil {
		t.Fatalf("Desired trace %x not found.", id)
	}
	if len(tr.Spans) != 1 {
		t.Errorf("Returned trace should have 1 span, found %#v", tr)
	}
	if tr.Spans[0].Name != "The Span" {
		t.Fatalf("Returned span has wrong name: %#v", tr)
	}
}