/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package m.dssat.utils.replacedate;

import csip.ModelDataService;
import csip.annotations.Description;
import csip.annotations.Name;
import csip.annotations.Options;
import csip.annotations.VersionInfo;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.ws.rs.Path;

/**
 *
 * @author kush
 */
@Name("DSSAT replace dates")
@Description("DSSAT replace dates csip service")
@VersionInfo("1.0")
@Path("d/replacedate/1.0")
@Options(timeout = "P2H")
public class V1_0 extends ModelDataService {

  static final String START_DATE_OLD = "start_date_old";
  static final String START_DATE = "start_date"; //NEW START DATE

  @Override
  protected void doProcess() throws Exception {
    String start_date_old = parameter().getString(START_DATE_OLD);
    String start_date = parameter().getString(START_DATE);

    File[] ptxFiles = this.getPTXFiles(workspace().getDir().getAbsolutePath());
    for (File currPTXFile : ptxFiles) {
      processDatesInPTXFile(currPTXFile, start_date.split("-")[0].substring(2, 4), start_date_old.split("-")[0].substring(2, 4));
    }

    results().put(ptxFiles);
  }

  private File[] getPTXFiles(String folderPathToPTXFile) {
    File folderWithPTXFile = new File(folderPathToPTXFile).getAbsoluteFile();

    return folderWithPTXFile.listFiles((File dir, String filename) -> filename.toLowerCase().endsWith(".ptx"));
  }

  private void processDatesInPTXFile(File ptxFile, String replaceWith, String toReplace) throws IOException {
    File fromFile = ptxFile.getAbsoluteFile();
    String newPTXFileName = ptxFile.getAbsolutePath() + ".old";
    File toFile = new File(newPTXFileName);
    processDatesInPTXFile(fromFile, toFile, replaceWith, toReplace);
  }

  private void processDatesInPTXFile(File ptxFile, File newPTXFile, String replaceWith, String toReplace)
      throws IOException {

    // debug
    PrintWriter pw = new PrintWriter(new FileWriter(newPTXFile.getAbsoluteFile()), true);

    BufferedReader br = new BufferedReader(new FileReader(ptxFile));

    String line;

    boolean inNewSection = false;
    ArrayList<Integer> rows = new ArrayList();
    while ((line = br.readLine()) != null) {
      if (line.trim().startsWith("*")) {
        inNewSection = true;
        pw.println(line);
        continue;
      } else if (line.trim().equals("")) {
        inNewSection = false;
        pw.println();
        rows.clear();
        continue;
      } else {
        if (inNewSection) {
          if (lineHasDateRow(line)) {
            rows = getDateRows(line);
            pw.println(line);
          } else {
            String[] lineSplit = line.split("\\b");
            String newStr = "";
            if (rows.size() == 0) {
              newStr = line;
              pw.println(newStr);
              continue;
            }
            for (int i = 0; i < lineSplit.length; i++) {
              if (rows.contains(i)) {
                newStr += lineSplit[i].trim().replaceFirst(toReplace, replaceWith);
              } else {
                newStr += lineSplit[i];
              }
            }
            pw.println(newStr);
          }

        } else {
          pw.println(line);
        }
      }

    }
    br.close();
    pw.close();
    ptxFile.delete();
    newPTXFile.renameTo(ptxFile);
  }

  private boolean lineHasDateRow(String line) {
    if (line.trim().startsWith("@"))
			;
    String[] lineArr = line.split("\\s+");
    for (String currString : lineArr) {
      if (currString.endsWith("DAT") || currString.endsWith("DATE")) {
        return true;
      }
    }
    return false;
  }

  private ArrayList<Integer> getDateRows(String line) {
    ArrayList<Integer> dateRows = new ArrayList();
    if (line.trim().startsWith("@"))
			;
    String[] lineArr = line.split("\\b"); // includes spaces in split string
    int currIndex = 0;
    for (String currString : lineArr) {
      if (currString.endsWith("DAT") || currString.endsWith("DATE")) {
        dateRows.add(currIndex);
      }
      currIndex++;
    }
    return dateRows;
  }

}