package mining

import (
	"os"
	"path/filepath"
)

// AtomicWriteFile("profiles.json", data, 0644)
func AtomicWriteFile(path string, data []byte, perm os.FileMode) error {
	dir := filepath.Dir(path)

	tmpFile, err := os.CreateTemp(dir, ".tmp-*")
	if err != nil {
		return ErrInternal("create temp file").WithCause(err)
	}
	tmpPath := tmpFile.Name()

	success := false
	defer func() {
		if !success {
			os.Remove(tmpPath)
		}
	}()

	if _, err := tmpFile.Write(data); err != nil {
		tmpFile.Close()
		return ErrInternal("write temp file").WithCause(err)
	}

	if err := tmpFile.Sync(); err != nil {
		tmpFile.Close()
		return ErrInternal("sync temp file").WithCause(err)
	}

	if err := tmpFile.Close(); err != nil {
		return ErrInternal("close temp file").WithCause(err)
	}

	if err := os.Chmod(tmpPath, perm); err != nil {
		return ErrInternal("set file permissions").WithCause(err)
	}

	if err := os.Rename(tmpPath, path); err != nil {
		return ErrInternal("rename temp file").WithCause(err)
	}

	success = true
	return nil
}