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package com.structurizr.dsl;

import com.structurizr.Workspace;
import com.structurizr.util.StringUtils;

import java.nio.charset.StandardCharsets;
import java.util.Base64;

/**
 * Utility methods to get/set DSL on a workspace.
 */
public class DslUtils {

    static final String STRUCTURIZR_DSL_PROPERTY_NAME = "structurizr.dsl";
    static final String STRUCTURIZR_DSL_RETAIN_SOURCE_PROPERTY_NAME = "structurizr.dsl.source";

    /**
     * Gets the DSL associated with a workspace.
     *
     * @param workspace     a Workspace object
     * @return  a DSL string
     */
    public static String getDsl(Workspace workspace) {
        String base64 = workspace.getProperties().get(STRUCTURIZR_DSL_PROPERTY_NAME);
        if (!StringUtils.isNullOrEmpty(base64)) {
            return new String(Base64.getDecoder().decode(base64));
        }

        return "";
    }

    /**
     * Sets the DSL associated with a workspace.
     *
     * @param workspace     a Workspace object
     * @param dsl   the DSL string
     */
    public static void setDsl(Workspace workspace, String dsl) {
        if (!StringUtils.isNullOrEmpty(dsl)) {
            String base64 = Base64.getEncoder().encodeToString(dsl.getBytes(StandardCharsets.UTF_8));
            workspace.addProperty(STRUCTURIZR_DSL_PROPERTY_NAME, base64);
        }
    }

}