/*
 * Copyright (C) 2010 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.doclava;

import com.google.clearsilver.jsilver.data.Data;

import java.io.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;


public class DocFile {
  private static final Pattern LINE = Pattern.compile("(.*)[\r]?\n", Pattern.MULTILINE);
  private static final Pattern PROP = Pattern.compile("([^=]+)=(.*)");

  public static String readFile(String filename) {
    try {
      File f = new File(filename);
      int length = (int) f.length();
      FileInputStream is = new FileInputStream(f);
      InputStreamReader reader = new InputStreamReader(is, "UTF-8");
      char[] buf = new char[length];
      int index = 0;
      int amt;
      while (true) {
        amt = reader.read(buf, index, length - index);

        if (amt < 1) {
          break;
        }

        index += amt;
      }
      return new String(buf, 0, index);
    } catch (IOException e) {
      return null;
    }
  }

  public static void writePage(String docfile, String relative, String outfile) {
    Data hdf = Doclava.makeHDF();

    /*
     * System.out.println("docfile='" + docfile + "' relative='" + relative + "'" + "' outfile='" +
     * outfile + "'");
     */

    String filedata = readFile(docfile);

    // The document is properties up until the line "@jd:body".
    // Any blank lines are ignored.
    int start = -1;
    int lineno = 1;
    Matcher lines = LINE.matcher(filedata);
    String line = null;
    while (lines.find()) {
      line = lines.group(1);
      if (line.length() > 0) {
        if (line.equals("@jd:body")) {
          start = lines.end();
          break;
        }
        Matcher prop = PROP.matcher(line);
        if (prop.matches()) {
          String key = prop.group(1);
          String value = prop.group(2);
          hdf.setValue(key, value);
        } else {
          break;
        }
      }
      lineno++;
    }
    if (start < 0) {
      System.err.println(docfile + ":" + lineno + ": error parsing docfile");
      if (line != null) {
        System.err.println(docfile + ":" + lineno + ":" + line);
      }
      System.exit(1);
    }

    // if they asked to only be for a certain template, maybe skip it
    String fromTemplate = hdf.getValue("template.which", "");
    String fromPage = hdf.getValue("page.onlyfortemplate", "");
    if (!"".equals(fromPage) && !fromTemplate.equals(fromPage)) {
      return;
    }

    // and the actual text after that
    String commentText = filedata.substring(start);

    Comment comment = new Comment(commentText, null, new SourcePositionInfo(docfile, lineno, 1));
    TagInfo[] tags = comment.tags();

    TagInfo.makeHDF(hdf, "root.descr", tags);

    hdf.setValue("commentText", commentText);

    // write the page using the appropriate root template, based on the
    // whichdoc value supplied by build
    String fromWhichmodule = hdf.getValue("android.whichmodule", "");
    if (fromWhichmodule.equals("online-pdk")) {
      // leaving this in just for temporary compatibility with pdk doc
      hdf.setValue("online-pdk", "true");
      // add any conditional login for root template here (such as
      // for custom left nav based on tab etc.
      ClearPage.write(hdf, "docpage.cs", outfile);
    } else {
      String filename = outfile;
      // Check whether this is a localized page and remove the intl/*/ path from filename
      if (filename.indexOf("intl/") == 0) {
        filename = filename.substring(filename.indexOf("/", 5) + 1); // After intl/ to get 2nd /
      }
      if (filename.indexOf("design/") == 0) {
        hdf.setValue("design", "true");
      } else if (filename.indexOf("develop/") == 0) {
        hdf.setValue("develop", "true");
      } else if (filename.indexOf("guide/") == 0) {
        hdf.setValue("guide", "true");
      } else if (filename.indexOf("training/") == 0) {
        hdf.setValue("training", "true");
      } else if (filename.indexOf("more/") == 0) {
        hdf.setValue("more", "true");
      } else if (filename.indexOf("google/") == 0) {
        hdf.setValue("google", "true");
      } else if (filename.indexOf("distribute/") == 0) {
        hdf.setValue("distribute", "true");
      } else if (filename.indexOf("about/") == 0) {
        hdf.setValue("about", "true");
      } else if ((filename.indexOf("tools/") == 0) || (filename.indexOf("sdk/") == 0)) {
        hdf.setValue("tools", "true");
      }

      if ((filename.indexOf("tools/sdk/preview/index.html") == 0) ||
          (filename.indexOf("sdk/index.html") == 0) ||
          (filename.indexOf("tools/sdk/ndk/index.html") == 0)) {
        ClearPage.write(hdf, "sdkpage.cs", outfile);
      } else {
        ClearPage.write(hdf, "docpage.cs", outfile);
      }
    }
  } // writePage
}