/*
    *    Copyright 2010-2023 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 org.apache.ibatis.migration.hook;
  
  import java.io.ByteArrayOutputStream;
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.io.PrintStream;
  import java.io.StringReader;
  import java.util.Map;
  import java.util.Properties;
  
  import org.apache.ibatis.migration.MigrationException;
  import org.apache.ibatis.migration.VariableReplacer;
  import org.apache.ibatis.migration.utils.Util;
  
  public class SqlHookScript implements HookScript {
  
    protected final File scriptFile;
    protected final String charset;
    protected final Properties variables;
    protected final PrintStream printStream;
    protected final VariableReplacer replacer;
  
    public SqlHookScript(File scriptFile, String charset, String[] options, Properties variables,
        PrintStream printStream) {
      this.scriptFile = scriptFile;
      this.charset = charset;
      this.variables = variables;
      this.printStream = printStream;
      // options can be local variables in key=value format.
      for (String option : options) {
        int sep = option.indexOf('=');
        if (sep > -1) {
          this.variables.put(option.substring(0, sep), option.substring(sep + 1));
        }
      }
      replacer = new VariableReplacer(this.variables);
    }
  
    @Override
    public void execute(Map<String, Object> bindingMap) {
      HookContext context = (HookContext) bindingMap.get(MigrationHook.HOOK_CONTEXT);
      printStream.println(Util.horizontalLine("Applying SQL hook: " + scriptFile.getName(), 80));
  
      try (FileInputStream inputStream = new FileInputStream(scriptFile);
          ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
        byte[] buffer = new byte[1024];
        int length;
        while ((length = inputStream.read(buffer)) != -1) {
          outputStream.write(buffer, 0, length);
        }
        try (StringReader reader = new StringReader(replacer.replace(outputStream.toString(charset)))) {
          context.executeSql(reader);
        }
      } catch (IOException e) {
        throw new MigrationException("Error occurred while running SQL hook script.", e);
      }
    }
  }