public boolean isButtonEnabled(int skill, Player player) {
if (player == null) return false;
if (player.hasSkill(skill)) return false;
if (player.getSkillPoints() < getSkillXpCost(skill, player)) return false;
if (!hasRequiredSkills(skill, player)) return false;
return true;
}
private boolean hasRequiredSkills(int skill, Player player) {
String prereqs = skillPrereqs[skill];
for (int i = 0; i < prereqs.length(); i++) {
int prereqIndex = prereqs.charAt(i) - 65;
if (!player.hasSkill(prereqIndex)) return false;
}
return true;
}
public boolean isButtonSelected(int skill, Player player) {
return (player != null && player.hasSkill(skill));
}