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/*
 * SonarQube Flex Plugin
 * Copyright (C) 2010 SonarSource
 * [email protected]
 *
 * 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  02
 */
package org.sonar.flex.checks;

import com.sonar.sslr.api.AstAndTokenVisitor;
import com.sonar.sslr.api.AstNode;
import com.sonar.sslr.api.Token;
import org.sonar.check.BelongsToProfile;
import org.sonar.check.Priority;
import org.sonar.check.Rule;
import org.sonar.flex.FlexKeyword;
import org.sonar.squidbridge.checks.SquidCheck;
import org.sonar.sslr.parser.LexerlessGrammar;

import javax.annotation.Nullable;

@Rule(key = "S1466",
  priority = Priority.CRITICAL)
@BelongsToProfile(title = CheckList.SONAR_WAY_PROFILE, priority = Priority.CRITICAL)
public class ExactSettingsSetToFalseCheck extends SquidCheck implements AstAndTokenVisitor {

  private static enum State {
    EXPECTING_SECURITY,
    EXPECTING_DOT,
    EXPECTING_EXACT_SETTINGS,
    EXPECTING_EQUAL,
    EXPECTING_FALSE,
    FOUND_ISSUE
  }

  private static enum Symbol {
    OTHER,
    SECURITY,
    DOT,
    EXACT_SETTINGS,
    EQUAL,
    FALSE
  }

  private static final State[][] TRANSITIONS = new State[State.values().length][Symbol.values().length];

  static {
    for (int i = 0; i < TRANSITIONS.length; i++) {
      for (int j = 0; j < TRANSITIONS[i].length; j++) {
        TRANSITIONS[i][j] = State.EXPECTING_SECURITY;
      }
    }

    TRANSITIONS[State.EXPECTING_SECURITY.ordinal()][Symbol.SECURITY.ordinal()] = State.EXPECTING_DOT;
    TRANSITIONS[State.EXPECTING_DOT.ordinal()][Symbol.DOT.ordinal()] = State.EXPECTING_EXACT_SETTINGS;
    TRANSITIONS[State.EXPECTING_EXACT_SETTINGS.ordinal()][Symbol.EXACT_SETTINGS.ordinal()] = State.EXPECTING_EQUAL;
    TRANSITIONS[State.EXPECTING_EQUAL.ordinal()][Symbol.EQUAL.ordinal()] = State.EXPECTING_FALSE;
    TRANSITIONS[State.EXPECTING_FALSE.ordinal()][Symbol.FALSE.ordinal()] = State.FOUND_ISSUE;
  }

  private State currentState;

  @Override
  public void visitFile(@Nullable AstNode node) {
    currentState = State.EXPECTING_SECURITY;
  }


  @Override
  public void visitToken(Token token) {
    currentState = TRANSITIONS[currentState.ordinal()][getSymbol(token.getOriginalValue()).ordinal()];

    if (currentState == State.FOUND_ISSUE) {
      getContext().createLineViolation(this, "Set flash.system.Security.exactSettings to true", token);
      currentState = State.EXPECTING_SECURITY;
    }
  }


  private static Symbol getSymbol(String value) {
    Symbol result = Symbol.OTHER;

    if (".".equals(value)) {
      result = Symbol.DOT;
    } else if ("Security".equals(value)) {
      result = Symbol.SECURITY;
    } else if ("exactSettings".equals(value)) {
      result = Symbol.EXACT_SETTINGS;
    } else if ("=".equals(value)) {
      result = Symbol.EQUAL;
    } else if (FlexKeyword.FALSE.getValue().equals(value)) {
      result = Symbol.FALSE;
    }

    return result;
  }
}