package common

import (
	"encoding/json"
	"fmt"
)

// Patch selected top-level fields against the latest file, under the same lock
// used by game saves. Raw JSON retains 64-bit scores and unknown save sections.
func PatchPersistentFields(patch map[string]json.RawMessage) error {
	if patch == nil {
		return fmt.Errorf("persistent patch must be a JSON object")
	}
	for _, raw := range patch {
		if !json.Valid(raw) {
			return fmt.Errorf("invalid persistent field JSON")
		}
	}
	persistentWriteMu.Lock()
	defer persistentWriteMu.Unlock()
	unlock, err := lockPersistentFile()
	if err != nil {
		return err
	}
	defer unlock()
	root, err := readCurrencyWarsPersistentRoot()
	if err != nil {
		return err
	}
	for key, value := range patch {
		root[key] = value
	}
	return writeJSONAtomic("persistent", root)
}