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/*
 * SonarQube JavaScript Plugin
 * Copyright (C) 2011-2017 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.javascript.checks.verifier;

import com.google.common.base.Function;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Ordering;
import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.sonar.api.batch.fs.InputFile;
import org.sonar.javascript.checks.verifier.TestIssue.Location;
import org.sonar.javascript.se.SeCheck;
import org.sonar.javascript.se.SeChecksDispatcher;
import org.sonar.javascript.visitors.JavaScriptVisitorContext;
import org.sonar.plugins.javascript.api.JavaScriptCheck;
import org.sonar.plugins.javascript.api.visitors.Issue;
import org.sonar.plugins.javascript.api.visitors.IssueLocation;
import org.sonar.plugins.javascript.api.visitors.LineIssue;
import org.sonar.plugins.javascript.api.visitors.PreciseIssue;
import org.sonar.squidbridge.checks.CheckMessagesVerifier;

import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.Assert.fail;

public class JavaScriptCheckVerifier {

  private JavaScriptCheckVerifier() {
  }

  /**
   * Example:
   *    * JavaScriptCheckVerifier.issues(new MyCheck(), myFile))
   *    .next().atLine(2).withMessage("This is message for line 2.")
   *    .next().atLine(3).withMessage("This is message for line 3.").withCost(2.)
   *    .next().atLine(8)
   *    .noMore();
   * 
   */
  public static CheckMessagesVerifier issues(JavaScriptCheck check, File file) {
    return CheckMessagesVerifier.verify(TreeCheckTest.getIssues(file.getAbsolutePath(), check));
  }

  /**
   * To use this message you should provide a comment on each line of the source file where you expect an issue.
   * For example:
   *    * var x = 1; // Noncompliant {{A message for this line.}}
   *
   * function foo() {  // Noncompliant [[effortToFix=2]] [[secondary=+0,+1]] [[sc=5;ec=6;el=+0]]
   * }
   * 
   * How to write these comments:
   * 
   * Put a comment starting with "Noncompliant" if you expect an issue on this line.
   * If for some reason you can't put comment on a line with issue, put "@+N" just after "Noncompliant" for issue located  N lines after the one with comment 
   * In double curly braces {{MESSAGE}} provide expected message.
   * In double brackets provide expected effort to fix (cost) with effortToFix keyword.
   * In double brackets provide precise location description with sc, ec, el keywords respectively for start column, end column and end line.
   * Since version 2.13 to specify precise location you can provide separate comment on next line which contains
   *     symbol ^ under each character of issue location.
   *    * x = a && a;  // Noncompliant
   * //    ^^
   * 
   *Since version 2.15 to specify precise secondary location you can provide separate comment on next line which contains
   *     symbol ^ under each character of secondary issue location.
   *     Start comment with "S" symbol and put after "^" ID of issue (specify it in double square brackets).
   *     You can optionally provide message of secondary location.
   * 
   *    * x = a && a;  // Noncompliant [[id=SomeID]]
   * //S   ^^ SomeID {{secondary message}}
   * 
   * In double brackets provide secondary locations with secondary keyword.
   * To specify the line you can use relative location by putting + or -.
   * All listed elements are optional (except "Noncompliant").
   * 
   *
   * Example of call:
   *    * JavaScriptCheckVerifier.verify(new MyCheck(), myFile));
   * 
   */
  public static void verify(JavaScriptCheck check, File file) {
    verify(check, TestUtils.createTestInputFile(file.getAbsolutePath()));
  }

  static void verify(JavaScriptCheck check, InputFile file) {
    JavaScriptVisitorContext context = TestUtils.createContext(file);

    List expectedIssues = ExpectedIssuesParser.parseExpectedIssues(context);
    Iterator actualIssues = getActualIssues(check, context);

    for (TestIssue expected : expectedIssues) {
      if (actualIssues.hasNext()) {
        verifyIssue(expected, actualIssues.next());
      } else {
        throw new AssertionError("Missing issue at line " + expected.line());
      }
    }

    if (actualIssues.hasNext()) {
      Issue issue = actualIssues.next();
      throw new AssertionError("Unexpected issue at line " + line(issue) + ": \"" + message(issue) + "\"");
    }
  }

  public static Iterator getActualIssues(JavaScriptCheck check, JavaScriptVisitorContext context) {
    JavaScriptCheck checkToRun = check;
    if (check instanceof SeCheck) {
      checkToRun = new SeChecksDispatcher(ImmutableList.of((SeCheck) check));
    }

    List issues = checkToRun.scanFile(context);
    List sortedIssues = Ordering.natural().onResultOf(new IssueToLine()).sortedCopy(issues);
    return sortedIssues.iterator();
  }

  private static void verifyIssue(TestIssue expected, Issue actual) {
    if (line(actual) > expected.line()) {
      fail("Missing issue at line " + expected.line());
    }
    if (line(actual) < expected.line()) {
      fail("Unexpected issue at line " + line(actual) + ": \"" + message(actual) + "\"");
    }
    if (expected.message() != null) {
      assertThat(message(actual)).as("Bad message at line " + expected.line()).isEqualTo(expected.message());
    }
    if (expected.effortToFix() != null) {
      assertThat(actual.cost()).as("Bad effortToFix at line " + expected.line()).isEqualTo((double) expected.effortToFix());
    }
    if (expected.startColumn() != null) {
      assertThat(((PreciseIssue) actual).primaryLocation().startLineOffset() + 1).as("Bad start column at line " + expected.line()).isEqualTo(expected.startColumn());
    }
    if (expected.endColumn() != null) {
      assertThat(((PreciseIssue) actual).primaryLocation().endLineOffset() + 1).as("Bad end column at line " + expected.line()).isEqualTo(expected.endColumn());
    }
    if (expected.endLine() != null) {
      assertThat(((PreciseIssue) actual).primaryLocation().endLine()).as("Bad end line at line " + expected.line()).isEqualTo(expected.endLine());
    }
    if (!expected.secondaryLocations().isEmpty()) {
      assertSecondary(actual, expected);
    }
  }

  private static void assertSecondary(Issue actualIssue, TestIssue expectedIssue) {
    List expectedLocations = expectedIssue.secondaryLocations();
    List actualLocations = actualIssue instanceof PreciseIssue ? ((PreciseIssue) actualIssue).secondaryLocations() : new ArrayList<>();

    String format = "Bad secondary location at line %s (issue at line %s): %s";

    for (Location expected : expectedLocations) {
      IssueLocation actual = secondary(expected.line(), actualLocations);

      if (actual != null) {
        if (expected.message() != null) {
          assertThat(actual.message()).as(String.format(format, expected.line(), line(actualIssue), "bad message")).isEqualTo(expected.message());
        }
        if (expected.startColumn() != null) {
          assertThat(actual.startLineOffset() + 1).as(String.format(format, expected.line(), line(actualIssue), "bad start column")).isEqualTo(expected.startColumn());
          assertThat(actual.endLineOffset() + 1).as(String.format(format, expected.line(), line(actualIssue), "bad end column")).isEqualTo(expected.endColumn());
        }
        actualLocations.remove(actual);
      } else {
        throw new AssertionError("Missing secondary location at line " + expected.line() + " for issue at line " + expectedIssue.line());
      }
    }

    if (!actualLocations.isEmpty()) {
      IssueLocation location = actualLocations.get(0);
      throw new AssertionError("Unexpected secondary location at line " + location.startLine() + " for issue at line " + line(actualIssue));
    }
  }

  private static IssueLocation secondary(int line, List allSecondaryLocations) {
    for (IssueLocation location : allSecondaryLocations) {
      if (location.startLine() == line) {
        return location;
      }
    }
    return null;
  }

  private static class IssueToLine implements Function {
    @Override
    public Integer apply(Issue issue) {
      return line(issue);
    }
  }

  private static int line(Issue issue) {
    if (issue instanceof PreciseIssue) {
      return ((PreciseIssue) issue).primaryLocation().startLine();
    } else {
      return ((LineIssue) issue).line();
    }
  }

  private static String message(Issue issue) {
    if (issue instanceof PreciseIssue) {
      return ((PreciseIssue) issue).primaryLocation().message();
    } else {
      return ((LineIssue) issue).message();
    }
  }

}