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package m.dssat.utils.replaceyear;

import csip.ModelDataService;
import csip.api.server.PayloadParameter;
import csip.annotations.Description;
import csip.annotations.Name;
import csip.annotations.Options;
import csip.annotations.VersionInfo;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Files;
import javax.ws.rs.Path;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.runtime.RuntimeConstants;

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

  private static final String TMP_DSSAT = "tmp.DSSAT";
  private static final String FILE_NAME = "file_name";
  private static final String YEAR_1 = "year_1";
  private static final String YEAR_2 = "year_2";
  private static final String YEAR_3 = "year_3";
  private static final String YEAR_4 = "year_4";
  private static final String YEAR_5 = "year_5";

  String year_1;
  String year_2;
  String year_3;
  String year_4;
  String year_5;

  @Override
  protected synchronized void doProcess() throws Exception {

    PayloadParameter pp = parameter();
    String template = pp.getString(FILE_NAME);
    year_1 = pp.getString(YEAR_1);
    year_2 = pp.getString(YEAR_2, "NA");
    year_3 = pp.getString(YEAR_3, "NA");
    year_4 = pp.getString(YEAR_4, "NA");
    year_5 = pp.getString(YEAR_5, "NA");

    results().put(createConfig(template));
  }

  public String getYear_1() {
    return year_1;
  }

  public String getYear_2() {
    return year_2;
  }

  public String getYear_3() {
    return year_3;
  }

  public String getYear_4() {
    return year_4;
  }

  public String getYear_5() {
    return year_5;
  }

  private File renameInputTemplate(String template) {
    String sourcePath = workspace().getFile(template).getAbsolutePath();
    String destPath = workspace().getDir().getAbsolutePath() + "/" + TMP_DSSAT;
    File sourceTemplate = new File(sourcePath);
    File destTemplate = new File(destPath);

    try {
      Files.copy(sourceTemplate.toPath(), destTemplate.toPath());
    } catch (IOException ex) {
      throw new RuntimeException(ex.getMessage());
    }

    try {
      if (!Files.readAllLines(sourceTemplate.toPath()).equals(Files.readAllLines(destTemplate.toPath()))) {
        throw new RuntimeException("File not fully copied");
      } else {
        Files.delete(sourceTemplate.toPath());
      }
    } catch (IOException ex) {
      throw new RuntimeException(ex.getMessage());
    }

    return sourceTemplate;
  }

  private File createConfig(String template) throws IOException {
    VelocityEngine velocity = new VelocityEngine();
    velocityInit(velocity);
    VelocityContext context = new VelocityContext();
    context.put("dssat", this);

    File filledTemplate = renameInputTemplate(template);

    try (FileWriter w = new FileWriter(filledTemplate.getAbsolutePath())) {
      Template vt = velocity.getTemplate(TMP_DSSAT, "utf-8");
      vt.merge(context, w);
    }
    return filledTemplate;
  }

  public void velocityInit(VelocityEngine velocity) {
    velocity.setProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH,
        workspace().getDir().getAbsolutePath());
    velocity.init();
  }

}