package utils

import (
	"bufio"
	"errors"
	"os"
	"testing"

	"github.com/rs/zerolog"
	"github.com/stretchr/testify/assert"
)

func TestErrorWrapper(t *testing.T) {
	scanner, _, writer := mockLogger(t)
	log := zerolog.New(writer)

	TestError1 := errors.New("first error")
	TestError2 := errors.New("secound error")

	resulterror := WrapError(TestError1, TestError2, log)

	assert.Equal(t, "first error: secound error", resulterror.Error())

	scanner.Scan()
	got := scanner.Text()
	assert.Equal(t, "{\"level\":\"error\",\"error\":\"secound error\",\"message\":\"first error\"}", got)

	assert.ErrorIs(t, resulterror, TestError1)
	assert.NotErrorIs(t, resulterror, TestError2)
}

// https://stackoverflow.com/questions/44119951/how-to-check-a-log-output-in-go-test
func mockLogger(t *testing.T) (*bufio.Scanner, *os.File, *os.File) {
	reader, writer, err := os.Pipe()
	if err != nil {
		assert.Fail(t, "couldn't get os Pipe: %v", err)
	}

	return bufio.NewScanner(reader), reader, writer
}