content: /*
   * Copyright 2022-2023 the original author or authors.
   *
   * 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
   *
   *      https://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.alibaba.initializer.core.template;
  
  import java.io.IOException;
  import java.io.Reader;
  import java.nio.file.Path;
  import java.util.List;
  import java.util.Map;
  import java.util.function.Function;
  import java.util.stream.Collectors;
  
  import com.samskivert.mustache.Mustache;
  import com.samskivert.mustache.Template;
  import lombok.SneakyThrows;
  import org.apache.commons.io.IOUtils;
  import org.apache.commons.lang3.StringUtils;
  
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.cache.Cache;
  
  /**
   * @author <a href="mailto:chenxilzx1@gmail.com">theonefx</a>
   */
  public class CodeTemplateRepoRenderer {
  
      private static final String MUSTACHE_SUFIX = ".mustache";
  
      private final Mustache.Compiler mustache;
  
      private final Function<String, String> keyGenerator;
  
      private final Cache templateCache;
  
      @Autowired
      private TemplateStringRender templateStringRender;
  
      public CodeTemplateRepoRenderer() {
          this.mustache = Mustache.compiler().escapeHTML(false);
          this.keyGenerator = null;
          this.templateCache = null;
      }
  
      public RepoRenderResult render(CodeTemplateRepo repo, Map<String, String> params) {
  
          List<RepoRenderResult.TemplateRenderResult> list = repo
                  .getTemplates()
                  .stream()
                  .map(temp -> render(temp, params))
                  .collect(Collectors.toList());
  
          return new RepoRenderResult(repo, list);
      }
  
      @SneakyThrows
      public RepoRenderResult.TemplateRenderResult render(CodeTemplate template, Map<String, String> params) {
          String fileName = template.getFileName();
          fileName = StringUtils.removeEnd(fileName, MUSTACHE_SUFIX);
  
          Path path = template.getFullPath();
  
          Path folder = path.getParent();
  
          folder = templateStringRender.renderPath(folder, params);
          fileName = templateStringRender.renderString(fileName, params);
  
          String content = renderStringContent(template, params);
  
          return new RepoRenderResult.TemplateRenderResult(fileName, folder, content);
      }
  
      public String renderStringContent(CodeTemplate template) throws IOException {
          return renderStringContent(template, null);
      }
  
      public String renderStringContent(CodeTemplate template, Map<String, String> params) throws IOException {
          String fileName = template.getFileName();
          String content;
          if (fileName.endsWith(MUSTACHE_SUFIX)) {
              content = getTemplate(template).execute(params);
          } else {
              content = getStringContent(template);
          }
          return content;
      }
  
      private String getStringContent(CodeTemplate template) throws IOException {
          try (Reader reader = template.getReader()) {
              return IOUtils.toString(reader);
          }
      }
  
      private Template getTemplate(CodeTemplate template) {
          try {
              if (this.templateCache != null) {
                  try {
                      return this.templateCache.get(this.keyGenerator.apply(template.getFileName()), () -> loadTemplate(template));
                  } catch (Cache.ValueRetrievalException ex) {
                      throw ex.getCause();
                  }
              }
              return loadTemplate(template);
          } catch (Throwable ex) {
              throw new IllegalStateException("Cannot load template " + template.getFileName(), ex);
          }
      }
  
      private Template loadTemplate(CodeTemplate codeTemplate) throws Exception {
          try (Reader reader = codeTemplate.getReader()) {
              return this.mustache.compile(reader);
          }
      }
  }
  