package envoy.server.data;

import static java.util.function.Function.identity;

import envoy.data.Config;

/**
 * @author Leon Hofmeister
 * @since Envoy Server v0.2-beta
 */
public final class ServerConfig extends Config {

	private static ServerConfig config;

	/**
	 * @return the singleton instance of the server config
	 * @since Envoy Client v0.1-beta
	 */
	public static ServerConfig getInstance() {
		return config == null ? config = new ServerConfig() : config;
	}

	private ServerConfig() {
		super(".envoy-server");
		put("enter-to-stop", "dev-stop", Boolean::parseBoolean);
		// parameters for issue reporting
		put("issueCreationURL", "i-url", identity());
		put("issueAuthToken", "i-token", identity());
		put("userMadeLabel", "l-um", identity());
		put("bugLabel", "l-b", identity());
		put("featureLabel", "l-f", identity());
		// enabling/ disabling several processors
		put("enableIssueReporting", "e-ir", Boolean::parseBoolean);
		put("enableGroups", "e-g", Boolean::parseBoolean);
		put("enableAttachments", "e-a", Boolean::parseBoolean);
		// user authentication
		put("authTokenExpiration", "tok-exp", Integer::parseInt);
	}

	/**
	 * @return true if this server should be stoppable by pressing enter
	 * @since Envoy Server v0.2-beta
	 */
	public Boolean isEnterToStop() { return (Boolean) items.get("enter-to-stop").get(); }

	/**
	 * @return {@code true} if issue reporting is enabled
	 * @since Envoy Client v0.3-alpha
	 */
	public Boolean isIssueReportingEnabled() {
		return (Boolean) items.get("enableIssueReporting").get();
	}

	/**
	 * @return {@code true} if attachment support has been enabled
	 * @since Envoy Client v0.3-alpha
	 */
	public Boolean isAttachmentSupportEnabled() {
		return (Boolean) items.get("enableAttachments").get();
	}

	/**
	 * @return {@code true} if group support has been enabled
	 * @since Envoy Client v0.3-alpha
	 */
	public Boolean isGroupSupportEnabled() { return (Boolean) items.get("enableGroups").get(); }

	/**
	 * @return the URL where issues should be uploaded to
	 * @since Envoy Client v0.1-alpha
	 */
	public String getIssueReportingURL() { return (String) items.get("issueCreationURL").get(); }

	/**
	 * @return the String representation for the "{@code user made}" - label
	 * @since Envoy Client v0.1-alpha
	 */
	public String getUserMadeLabel() { return (String) items.get("userMadeLabel").get(); }

	/**
	 * @return the String representation for the "{@code user made}" - label
	 * @since Envoy Client v0.1-alpha
	 */
	public String getBugLabel() { return (String) items.get("bugLabel").get(); }

	/**
	 * @return the String representation for the "{@code user made}" - label
	 * @since Envoy Client v0.1-alpha
	 */
	public String getFeatureLabel() { return (String) items.get("featureLabel").get(); }

	/**
	 * @return the authorization token used to authenticate to
	 *         {@link ServerConfig#getIssueReportingURL()}. If null, authorization is expected to
	 *         occur via a query_param or via a basic user-password-combination
	 * @since Envoy Server v0.2-beta
	 */
	public String getIssueAuthToken() { return (String) items.get("issueAuthToken").get(); }

	/**
	 * @return the amount of days after which user authentication tokens expire
	 * @since Envoy Server v0.2-beta
	 */
	public Integer getAuthTokenExpiration() {
		return (Integer) items.get("authTokenExpiration").get();
	}
}