/*
 * Copyright (c) 2011-2025, baomidou (jobob@qq.com).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.baomidou.mybatisplus.generator.engine;

import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.generator.config.ConstVal;
import com.baomidou.mybatisplus.generator.config.builder.ConfigBuilder;
import freemarker.template.Configuration;
import freemarker.template.Template;
import org.jetbrains.annotations.NotNull;

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.io.StringWriter;
import java.util.Map;

/**
 * Freemarker 模板引擎实现文件输出
 *
 * @author nieqiurong
 * @since 2018-01-11
 */
public class FreemarkerTemplateEngine extends AbstractTemplateEngine {
    private Configuration configuration;

    @Override
    public @NotNull FreemarkerTemplateEngine init(@NotNull ConfigBuilder configBuilder) {
        configuration = new Configuration(Configuration.DEFAULT_INCOMPATIBLE_IMPROVEMENTS);
        configuration.setDefaultEncoding(ConstVal.UTF8);
        configuration.setClassForTemplateLoading(FreemarkerTemplateEngine.class, StringPool.SLASH);
        return this;
    }

    @Override
    public String writer(@NotNull Map<String, Object> objectMap, @NotNull String templateName, @NotNull String templateString) throws Exception {
        Template template = new Template(templateName, templateString, configuration);
        StringWriter writer = new StringWriter();
        template.process(objectMap, writer);
        return writer.toString();
    }

    @Override
    public void writer(@NotNull Map<String, Object> objectMap, @NotNull String templatePath, @NotNull File outputFile) throws Exception {
        Template template = configuration.getTemplate(templatePath);
        try (FileOutputStream fileOutputStream = new FileOutputStream(outputFile)) {
            template.process(objectMap, new OutputStreamWriter(fileOutputStream, ConstVal.UTF8));
        }
    }


    @Override
    public @NotNull String templateFilePath(@NotNull String filePath) {
        return filePath + ".ftl";
    }
}
