package common

import (
	"encoding/json"
	"fmt"
)

func ReadWarpUnlockMode() (*int, error) {
	root, err := readCurrencyWarsPersistentRoot()
	if err != nil {
		return nil, err
	}
	raw, ok := root["warp_unlock_mode"]
	if !ok {
		return nil, nil
	}
	var mode int
	if err := json.Unmarshal(raw, &mode); err != nil {
		return nil, err
	}
	if mode < 0 || mode > 3 {
		return nil, fmt.Errorf("invalid saved Warp visibility mode")
	}
	return &mode, nil
}