package rpc

import (
	"encoding/json"
	"errors"
	"fmt"
	"os"
	"path/filepath"
)

func writeRPCJournal(path string, value any) error {
	directory := filepath.Dir(path)
	if err := os.MkdirAll(directory, 0700); err != nil {
		return err
	}
	file, err := os.CreateTemp(directory, ".rpc-journal-*")
	if err != nil {
		return err
	}
	name := file.Name()
	defer os.Remove(name)
	if err := file.Chmod(0600); err != nil {
		_ = file.Close()
		return err
	}
	if err := json.NewEncoder(file).Encode(value); err != nil {
		_ = file.Close()
		return err
	}
	if err := file.Sync(); err != nil {
		_ = file.Close()
		return err
	}
	if err := file.Close(); err != nil {
		return err
	}
	if err := os.Rename(name, path); err != nil {
		return err
	}
	dir, err := os.Open(directory)
	if err != nil {
		return err
	}
	syncErr := dir.Sync()
	closeErr := dir.Close()
	if err := errors.Join(syncErr, closeErr); err != nil {
		return fmt.Errorf("sync journal directory: %w", err)
	}
	return nil
}