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/*
 * SonarQube JavaScript Plugin
 * Copyright (C) 2011-2022 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.plugins.javascript;

import java.io.IOException;
import java.util.Scanner;
import java.util.function.Predicate;
import java.util.regex.Pattern;
import org.sonar.api.batch.fs.FilePredicate;
import org.sonar.api.batch.fs.FileSystem;
import org.sonar.plugins.javascript.eslint.YamlSensor;

public class JavaScriptFilePredicate {

  private static final String regex = "\\]+lang=['\"]ts['\"][^>]*>";
  private static final Pattern pattern = Pattern.compile(regex);
  private static final Predicate predicate = pattern.asPredicate();
  private static final FilePredicate hasScriptTagWithLangTS = file -> {
    try {
      return predicate.test(file.contents());
    } catch (IOException e) {
      return false;
    }
  };

  // Helm template directives - for YAML files
  private static final String DIRECTIVE_IN_COMMENT = "#.*\\{\\{";
  private static final String DIRECTIVE_IN_SINGLE_QUOTE = "'[^']*\\{\\{[^']*'";
  private static final String DIRECTIVE_IN_DOUBLE_QUOTE = "\"[^\"]*\\{\\{[^\"]*\"";
  private static final String CODEFRESH_VARIABLES = "\\{\\{[\\w\\s]+}}";
  private static final Pattern HELM_DIRECTIVE_IN_COMMENT_OR_STRING = Pattern.compile("("+
    String.join("|", DIRECTIVE_IN_COMMENT, DIRECTIVE_IN_SINGLE_QUOTE, DIRECTIVE_IN_DOUBLE_QUOTE, CODEFRESH_VARIABLES) + ")");

  private JavaScriptFilePredicate() {
  }

  public static FilePredicate getYamlPredicate(FileSystem fs) {
    return fs.predicates().and(fs.predicates().hasLanguage(YamlSensor.LANGUAGE), inputFile -> {
      try (Scanner scanner = new Scanner(inputFile.inputStream(), inputFile.charset().name())) {
        while (scanner.hasNextLine()) {
          String line = scanner.nextLine();
          if (line.contains("{{") && !HELM_DIRECTIVE_IN_COMMENT_OR_STRING.matcher(line).find()) {
            return false;
          }
        }
        return true;
      } catch (IOException e) {
        throw new IllegalStateException(String.format("Unable to read file: %s. %s", inputFile.uri(), e.getMessage()), e);
      }
    });
  }

  public static FilePredicate getJavaScriptPredicate(FileSystem fs) {
    return fs.predicates().and(
      fs.predicates().or(
        fs.predicates().and(
          fs.predicates().hasLanguage(JavaScriptLanguage.KEY),
          fs.predicates().not(fs.predicates().hasExtension("vue"))
        ),
        fs.predicates().and(
          fs.predicates().hasExtension("vue"),
          fs.predicates().not(hasScriptTagWithLangTS))));
  }

  public static FilePredicate getTypeScriptPredicate(FileSystem fs) {
    return fs.predicates().and(
      fs.predicates().or(
        fs.predicates().and(
          fs.predicates().hasLanguage(TypeScriptLanguage.KEY),
          fs.predicates().not(fs.predicates().hasExtension("vue"))
        ),
        fs.predicates().and(
          fs.predicates().hasExtension("vue"),
          hasScriptTagWithLangTS)));
  }
}