// Copyright (c) 2009 The Chromium Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

package org.chromium.debug.core.model;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

import java.util.List;

import org.chromium.sdk.Script;

import org.eclipse.osgi.util.NLS;

/**

 * Creates from a set of scripts a mock-up of full resource (scripts are positioned according

 * to their line numbers and the whitespace is filled with text pattern).

 */

class MockUpResourceWriter {

  static String writeScriptSource(List<Script> scripts) {

    ArrayList<Script> sortedScriptsArrayList = new ArrayList<Script>(scripts);

    Collections.sort(sortedScriptsArrayList, scriptPositionComparator);

    MockUpResourceWriter writer = new MockUpResourceWriter();

    for (Script script : sortedScriptsArrayList) {

      writer.writeSript(script);

    }

    return writer.getResult();

  }

  private int line = 0;

  private int col = 0;

  private final StringBuilder builder = new StringBuilder();

  private void writeSript(Script script) {

    int scriptLine = script.getStartLine();

    if (scriptLine > line) {

      fillLines(scriptLine - line);

      line = scriptLine;

    } else if (scriptLine < line) {

      writeLineMissMessage(scriptLine);

    } else {

      int scriptCol = script.getStartColumn();

      if (col < scriptCol) {

        fillColumns(scriptCol - col);

      } else if (col > scriptCol) {

        final boolean expectCorrectStartColumn = false;

        if (expectCorrectStartColumn) {

          writeln(""); //$NON-NLS-1$

          writeLineMissMessage(scriptLine);

        } else {

          // Ignore.

        }

      }

    }

    if (script.hasSource()) {

      writeText(script.getSource());

    } else {

      writeln(Messages.MockUpResourceWriter_SCRIPT_WITHOUT_TEXT);

    }

  }

  private void writeLineMissMessage(int scriptLine) {

    writeln(NLS.bind(Messages.MockUpResourceWriter_SCRIPTS_OVERLAPPED,

        line + 1 - scriptLine, scriptLine + 1));

  }

  private void writeText(String text) {

    int pos = 0;

    while (true) {

      int nlPos = text.indexOf('\n', pos);

      if (nlPos == -1) {

        String rest = text.substring(pos);

        builder.append(rest);

        col += rest.length();

        break;

      }

      writeln(text.substring(pos, nlPos));

      pos = nlPos + 1;

    }

  }

  private void writeln(String str) {

    builder.append(str).append('\n');

    line++;

    col = 0;

  }

  private void fillLines(int lines) {

    if (col != 0) {

      builder.append('\n');

      line++;

    }

    for (int i = 0; i < lines; i++) {

      builder.append(NOT_A_JAVASCRIPT_FILLER).append('\n');

    }

    line += lines;

    col = 0;

  }

  private void fillColumns(int number) {

    if (number < NOT_A_JAVASCRIPT_FILLER.length()) {

      if (number < 1) {

        // Nothing.

      } else if (number == 1) {

        builder.append('*');

        col += 1;

      } else {

        builder.append('{');

        for (int i = 2; i < number; i++) {

          builder.append('*');

        }

        builder.append('}');

        col += number;

      }

    }

  }

  private String getResult() {

    return builder.toString();

  }

  private static final String NOT_A_JAVASCRIPT_FILLER =

      Messages.MockUpResourceWriter_NOT_A_JAVASCRIPT;

  private static final Comparator<Script> scriptPositionComparator = new Comparator<Script>() {

    public int compare(Script o1, Script o2) {

      int line1 = o1.getStartLine();

      int line2 = o2.getStartLine();

      if (line1 < line2) {

        return -1;

      } else if (line1 == line2) {

        return 0;

      } else {

        return 1;

      }

    }

  };

}