package claude

import (
	"bytes"
	"context"
	"testing"
)

func TestConvertOpenAIResponseToClaude_StreamIgnoresNullToolNameDelta(t *testing.T) {
	originalRequest := []byte(`{"stream":true}`)
	var param any

	firstChunks := ConvertOpenAIResponseToClaude(
		context.Background(),
		"test-model",
		originalRequest,
		nil,
		[]byte(`data: {"id":"chatcmpl_1","model":"test-model","created":1,"choices":[{"index":0,"delta":{"role":"assistant","tool_calls":[{"index":0,"id":"call_1","type":"function","function":{"name":"read_file","arguments":""}}]},"finish_reason":null}]}`),
		&param,
	)
	firstOutput := bytes.Join(firstChunks, nil)
	if !bytes.Contains(firstOutput, []byte(`"name":"read_file"`)) {
		t.Fatalf("expected first chunk to start read_file tool block, got %s", string(firstOutput))
	}

	secondChunks := ConvertOpenAIResponseToClaude(
		context.Background(),
		"test-model",
		originalRequest,
		nil,
		[]byte(`data: {"id":"chatcmpl_1","model":"test-model","created":1,"choices":[{"index":0,"delta":{"tool_calls":[{"index":0,"function":{"name":null,"arguments":"{\"path\":\"/tmp/a\"}"}}]},"finish_reason":null}]}`),
		&param,
	)
	secondOutput := bytes.Join(secondChunks, nil)
	if bytes.Contains(secondOutput, []byte(`content_block_start`)) {
		t.Fatalf("did not expect null tool name delta to start a new content block, got %s", string(secondOutput))
	}
	if bytes.Contains(secondOutput, []byte(`"name":""`)) {
		t.Fatalf("did not expect null tool name delta to emit an empty tool name, got %s", string(secondOutput))
	}
}