package org.expeditee.auth;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;

import org.expeditee.items.Text;

public enum AuthenticationTag {
	Username ("txtUsername", System.getProperty("user.name")), 
	Password ("txtPassword", System.getProperty("user.password")), 
	PasswordAgain ("txtPasswordAgain", System.getProperty("user.password.again")), 
	NewPassword ("txtNewPassword", System.getProperty("user.new.password")), 
	NewPasswordAgain ("txtNewPasswordAgain", System.getProperty("user.new.password.again")), 
	Email ("txtEmail", System.getProperty("user.email")), 
	ColleagueOne ("txtColleagueOne", System.getProperty("user.colleague.one")), 
	ColleagueTwo ("txtColleagueTwo", System.getProperty("user.colleague.two"));
	
	public String val;
	public String def;

	private AuthenticationTag(final String tag, final String def) {
		this.val = tag;
		this.def = def;		
	}
	
	public static Optional<Map<AuthenticationTag, String>> fetchUserData(final Collection<Text> from, final AuthenticationTag... tags) {
		final Map<AuthenticationTag, String> fetchedData = new HashMap<AuthenticationTag, String>();
		
		for (final AuthenticationTag tag: tags) {
			for (final Text canditate: from) {
				// use the canditate if it exists
				if (canditate.hasData(tag.val)) {
					fetchedData.put(tag, canditate.getText());
					break;
				}
				// otherwise try use the default
				final String property = tag.def;
				if (property != null && !property.isEmpty()) { 
					fetchedData.put(tag, property); 
				}
			}
		}
		
		if (fetchedData.entrySet().size() == tags.length) {
			return Optional.of(fetchedData);
		} else { 
			return Optional.empty();
		}
	}
}