//CYCLONE MATRIX HOST NODE APPLICATION
//Hermann L. Johnson, 2019
//Free for unmodified distribution and non-commercial use.

import java.io.*;
import java.util.*;

public class DataManager {

    public DataManager(String root_directory) {

    }


//Use special methods to stop data files from being corrupted in case
//of shutdown.

//THE SERVER'S DATAMANAGER CANNOT REORDER ITS DATA IN THE MIDST OF A CLIENT
//CONNECTION, at least as far as that client is concerned.




    public Vector<String> getIndex() {

	Vector<String> index = new Vector<String>();

index.addElement("text index entry");
	return index;

    }

    //Does not want an extension.
    //Provides header hashes as well.
    public Vector<String> getHashList(String dataFile) {
	Vector<String> results = new Vector<String>();

System.err.println("Data manager is supposed to yield all hashes of "+dataFile);

results.addElement("hashlist for "+dataFile);

	return results;
    }

    //Does not want an extension.
    public Vector<String> getHeaderHashList(String dataFile) {
	Vector<String> results = new Vector<String>();
results.addElement("header hash list for "+dataFile);


	return results;
    }

    //Returns 1 if the exact datafile is on hand.
    //Returns 2 if the datafile is on hand, but is not exact.
    //Returns 0 if the datafile is non-existent.
    public int hasExactDataFile(String abbrLocation, String entriesDate,
				    String fileSha) {

System.err.println("Data manager: "+abbrLocation+" "+entriesDate+" "+fileSha+" is being queried, we are claiming that it is on hand, but not exact.");
return 2;

    }

    //Does not want an extension.
    //This would also yield a header entry that is requested by hash.
    public String getDataEntry(String dataFileName, String identifyingHash) {
System.err.println("Data manager is supposed to yield entry: "+identifyingHash);
return "This is a test line being pulled by getDataEntry!!!!!!!!%LBR%";
    }

    //Does not want an extension.
    //This also includes header entries.
    public Vector<String> getDataEntries(String dataFileName,
					 String hashSpan) {

	int dashLocation = 0;
	String firstHash = new String("");
	String secondHash = new String("");
	Vector<String> results = new Vector<String>();

	//If it was called with no dash, return nothing.
	if(!hashSpan.contains("-")) return results;

	dashLocation = hashSpan.indexOf("-");
	firstHash = hashSpan.substring(0,dashLocation);
	secondHash = hashSpan.substring(dashLocation+1,hashSpan.length());

System.err.println("data manager is supposed to yield hash span request: "+firstHash+" - "+secondHash);
//Get the entries..
results.addElement("dataentries for "+dataFileName+" hashspan: "+hashSpan);

	return results;
    }

    //This also accepts header entries.
    public void takeDataLine(String line) {
System.err.println("Data manager taking: "+line);
    }

//NOTE: If a date-time is not found where it should be, but is found in the
//next location as to imply that the hash
//was included, remove the hash from said inbound entry.

//ALSO! Headers must be considered, their format is different!

    public static boolean isValidDateTime(String date) {
	if(date.length()<24) return false;
	if(!isValidDate(date.substring(0,10))) return false;
	if(date.charAt(10)!='T') return false;
	if(!Character.isDigit(date.charAt(11))) return false;
	if(!Character.isDigit(date.charAt(12))) return false;
	if(date.charAt(13)!=':') return false;
	if(!Character.isDigit(date.charAt(14))) return false;
	if(!Character.isDigit(date.charAt(15))) return false;
	if(date.charAt(16)!=':') return false;
	if(!Character.isDigit(date.charAt(17))) return false;
	if(!Character.isDigit(date.charAt(18))) return false;
	if((date.charAt(19)!='+') && (date.charAt(19)!='-')) return false;
	if(!Character.isDigit(date.charAt(20))) return false;
	if(!Character.isDigit(date.charAt(21))) return false;
	if(date.charAt(22)!=':') return false;
	if(!Character.isDigit(date.charAt(23))) return false;
	if(!Character.isDigit(date.charAt(24))) return false;

	return true;
    }

    public static boolean isValidDate(String date) {
	String current_part;
	try {
	    StringTokenizer sttok = new StringTokenizer(date,"-");
	    current_part = sttok.nextToken();
	    if(current_part.length()!=4) return false;
	    for(int count=0;count<current_part.length();count++) {
		if(!Character.isDigit(current_part.charAt(count)))
		    return false;
	    }
	    current_part = sttok.nextToken();
	    if(current_part.length()!=2) return false;
	    for(int count=0;count<current_part.length();count++) {
		if(!Character.isDigit(current_part.charAt(count)))
		    return false;
	    }
	    current_part = sttok.nextToken();
	    if(current_part.length()!=2) return false;
	    for(int count=0;count<current_part.length();count++) {
		if(!Character.isDigit(current_part.charAt(count)))
		    return false;
	    }	    
	} catch(Exception e) {
	    return false;
	}
	return true;
    }

}