/*
 * Copyright (c) 2002 - 2006 IBM Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 */
package com.ibm.wala.cast.tree.impl;

import com.ibm.wala.cast.tree.CAstNode;
import com.ibm.wala.cast.tree.CAstSourcePositionMap;
import com.ibm.wala.util.collections.HashMapFactory;
import com.ibm.wala.util.collections.Iterator2Iterable;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Iterator;
import java.util.Map;
import java.util.NavigableSet;
import java.util.TreeSet;

public class CAstSourcePositionRecorder implements CAstSourcePositionMap {

  private final Map<CAstNode, Position> positions = HashMapFactory.make();

  @Override
  public Position getPosition(CAstNode n) {
    return positions.get(n);
  }

  @Override
  public Iterator<CAstNode> getMappedNodes() {
    return positions.keySet().iterator();
  }

  public void setPosition(CAstNode n, Position p) {
    positions.put(n, p);
  }

  public void setPosition(
      CAstNode n,
      final int fl,
      final int fc,
      final int ll,
      final int lc,
      final String url,
      final String file)
      throws MalformedURLException {
    setPosition(n, fl, fc, ll, lc, new URL(url), new URL(file));
  }

  public void setPosition(
      CAstNode n,
      final int fl,
      final int fc,
      final int ll,
      final int lc,
      final URL url,
      final URL file) {
    setPosition(
        n,
        new AbstractSourcePosition() {
          @Override
          public int getFirstLine() {
            return fl;
          }

          @Override
          public int getLastLine() {
            return ll;
          }

          @Override
          public int getFirstCol() {
            return fc;
          }

          @Override
          public int getLastCol() {
            return lc;
          }

          @Override
          public int getFirstOffset() {
            return -1;
          }

          @Override
          public int getLastOffset() {
            return -1;
          }

          @Override
          public URL getURL() {
            return url;
          }

          @Override
          public Reader getReader() throws IOException {
            return new InputStreamReader(file.openConnection().getInputStream());
          }

          @Override
          public String toString() {
            return "[" + fl + ':' + fc + "]->[" + ll + ':' + lc + ']';
          }
        });
  }

  public void setPosition(CAstNode n, int lineNumber, String url, String file)
      throws MalformedURLException {
    setPosition(n, lineNumber, new URL(url), new URL(file));
  }

  public void setPosition(CAstNode n, int lineNumber, URL url, URL file) {
    setPosition(n, new LineNumberPosition(url, file, lineNumber));
  }

  public void addAll(CAstSourcePositionMap other) {
    for (CAstNode node : Iterator2Iterable.make(other.getMappedNodes())) {
      setPosition(node, other.getPosition(node));
    }
  }

  @Override
  public NavigableSet<Position> positions() {
    return new TreeSet<>(positions.values());
  }
}
