package tester

import (
	"bufio"
	"os"
	"testing"

	"github.com/alcionai/corso/src/internal/tester/aw"
)

func LoadAFile(t *testing.T, fileName string) []byte {
	// Preserves '\n' of original file. Uses incremental version when file too large
	bytes, err := os.ReadFile(fileName)
	if err != nil {
		f, err := os.Open(fileName)
		aw.MustNoErr(t, err, "opening file: "+fileName)

		defer f.Close()

		buffer := make([]byte, 0)
		reader := bufio.NewScanner(f)

		for reader.Scan() {
			temp := reader.Bytes()
			buffer = append(buffer, temp...)
		}

		aw.MustNoErr(t, reader.Err(), "reading file: "+fileName)

		return buffer
	}

	return bytes
}