/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the "Elastic License
 * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
 * Public License v 1"; you may not use this file except in compliance with, at
 * your election, the "Elastic License 2.0", the "GNU Affero General Public
 * License v3.0 only", or the "Server Side Public License, v 1".
 */

package org.elasticsearch.script;

import org.elasticsearch.core.TimeValue;

import java.util.Map;

/**
 * A string template rendered as a script.
 */
public abstract class TemplateScript {

    private final Map<String, Object> params;

    public TemplateScript(Map<String, Object> params) {
        this.params = params;
    }

    /** Return the parameters for this script. */
    public Map<String, Object> getParams() {
        return params;
    }

    public static final String[] PARAMETERS = {};

    /** Run a template and return the resulting string, encoded in utf8 bytes. */
    public abstract String execute();

    public interface Factory {
        TemplateScript newInstance(Map<String, Object> params);
    }

    public static final ScriptContext<Factory> CONTEXT = new ScriptContext<>("template", Factory.class);

    // Remove compilation rate limit for ingest. Ingest pipelines may use many mustache templates, triggering compilation
    // rate limiting. MustacheScriptEngine explicitly checks for TemplateScript. Rather than complicating the implementation there by
    // creating a new Script class (as would be customary), this context is used to avoid the default rate limit.
    public static final ScriptContext<Factory> INGEST_CONTEXT = new ScriptContext<>(
        "ingest_template",
        Factory.class,
        200,
        TimeValue.timeValueMillis(0),
        false,
        true
    );
}