content: package dk.alexandra.fresco.suite.spdz;
  
  import dk.alexandra.fresco.suite.spdz.utils.LinearProgrammingInputReader;
  import java.io.BufferedReader;
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.FileReader;
  import java.io.IOException;
  import java.math.BigInteger;
  import java.util.LinkedList;
  
  public class PlainLPInputReader implements LinearProgrammingInputReader {
  
    private BigInteger[][] constraintValues;
    private BigInteger[] costValues;
    private int[][] constraintPattern;
    private int[] costPattern;
    private int noVariables;
    private int noConstraints;
    private int myId;
  
    private boolean readInputValues;
    private boolean readInputPattern;
    private BufferedReader valuesReader;
    private BufferedReader patternReader;
  
  
    public PlainLPInputReader(BufferedReader valuesReader, BufferedReader patternReader, int myId) {
      this.valuesReader = valuesReader;
      this.patternReader = patternReader;
      this.myId = myId;
      constraintValues = null;
      costValues = null;
      constraintPattern = null;
      costPattern = null;
      readInputValues = false;
      readInputPattern = false;
      noVariables = -1;
      noConstraints = -1;
    }
  
    public static PlainLPInputReader getFileInputReader(File values, File pattern, int myId)
        throws FileNotFoundException {
      BufferedReader valuesReader = new BufferedReader(new FileReader(values));
      BufferedReader patternReader = new BufferedReader(new FileReader(pattern));
      return new PlainLPInputReader(valuesReader, patternReader, myId);
    }
  
    @Override
    public BigInteger[][] getConstraintValues() {
      if (readInputValues) {
        return constraintValues;
      } else {
        return null;
      }
    }
  
    @Override
    public BigInteger[] getCostValues() {
      if (readInputValues) {
        return costValues;
      } else {
        return null;
      }
    }
  
    @Override
    public BigInteger[] getBValues() {
      BigInteger[] B = null;
      if (readInputValues) {
        B = new BigInteger[constraintValues.length];
        for (int i = 0; i < B.length; i++) {
          BigInteger[] constraint = constraintValues[i];
          B[i] = constraint[constraint.length - 1];
        }
      }
      return B;
    }
  
    @Override
    public BigInteger[] getFValues() {
      BigInteger[] F = null;
      if (readInputValues) {
        F = new BigInteger[costValues.length];
        for (int i = 0; i < F.length; i++) {
          if (costValues[i] != null) {
            F[i] = costValues[i].negate();
          } else {
            F[i] = null;
          }
        }
      }
      return F;
    }
  
    @Override
    public BigInteger[][] getCValues() {
      BigInteger[][] C = null;
      if (readInputValues) {
        C = new BigInteger[constraintValues.length][constraintValues[0].length - 1];
        for (int i = 0; i < constraintValues.length; i++) {
          System.arraycopy(constraintValues[i], 0, C[i], 0, C[i].length);
        }
      }
      return C;
    }
  
    @Override
    public int[][] getConstraintPattern() {
      if (readInputPattern) {
        return constraintPattern;
      } else {
        return null;
      }
    }
  
    @Override
    public int[] getCostPattern() {
      if (readInputPattern) {
        return costPattern;
      } else {
        return null;
      }
    }
  
    @Override
    public int[] getBPattern() {
      int[] B = null;
      if (readInputPattern) {
        B = new int[noConstraints];
        for (int i = 0; i < B.length; i++) {
          int[] constraint = constraintPattern[i];
          B[i] = constraint[constraint.length - 1];
        }
      }
      return B;
    }
  
    @Override
    public int[] getFPattern() {
      return getCostPattern();
    }
  
    @Override
    public int[][] getCPattern() {
      int[][] C = null;
      if (readInputPattern) {
        C = new int[noConstraints][noVariables];
        for (int i = 0; i < noConstraints; i++) {
          System.arraycopy(constraintPattern[i], 0, C[i], 0, C[i].length);
        }
      }
      return C;
    }
  
  
    @Override
    public void readInput() throws IOException, RuntimeException {
      readPattern(patternReader);
      readValues(valuesReader);
      checkConsistency();
    }
  
    private void readPattern(BufferedReader patternReader) throws IOException, RuntimeException {
      if (!readInputPattern) {
        LinkedList<int[]> constraintList = new LinkedList<>();
        String line = patternReader.readLine();
        if (line != null) {
          costPattern = parsePatternLine(line);
        } else {
          throw new RuntimeException("Input pattern malformed: Empty input");
        }
        line = patternReader.readLine();
        while (line != null && !line.trim().equals("")) {
          constraintList.add(parsePatternLine(line));
          line = patternReader.readLine();
        }
        patternReader.close();
  
        if (noVariables < 0) {
          noVariables = costPattern.length;
        } else if (costPattern.length != noVariables) {
          throw new RuntimeException("Input malformed: input pattern and values do not match");
        }
        if (noConstraints < 0) {
          noConstraints = constraintList.size();
        } else if (constraintList.size() != noConstraints) {
          throw new RuntimeException("Input malformed: input pattern and values do not match");
        }
        if (noConstraints == 0) {
          throw new RuntimeException("Input pattern malformed: No constraints given.");
        }
  
        int index = 0;
        constraintPattern = new int[noConstraints][noVariables + 1];
        for (int[] row : constraintList) {
          if (row.length != noVariables + 1) {
            throw new RuntimeException("Input pattern malformed: Dimensions do not match.");
          }
          constraintPattern[index] = row;
          index++;
        }
        readInputPattern = true;
      }
    }
  
    private int[] parsePatternLine(String line) {
      String[] fields = line.split(",");
      int[] pattern = new int[fields.length];
      for (int i = 0; i < fields.length; i++) {
        pattern[i] = Integer.parseInt(fields[i].trim());
      }
      return pattern;
    }
  
    private void readValues(BufferedReader valueReader) throws IOException, RuntimeException {
      if (!readInputValues) {
        LinkedList<BigInteger[]> constraintList = new LinkedList<>();
        String line = valueReader.readLine();
        if (line != null) {
          costValues = parseValueLine(line);
        } else {
          throw new RuntimeException("Input values malformed: Empty input");
        }
        line = valueReader.readLine();
        while (line != null && !line.trim().equals("")) {
          constraintList.add(parseValueLine(line));
          line = valueReader.readLine();
        }
        valueReader.close();
  
        if (noVariables < 0) {
          noVariables = costValues.length;
        } else if (costValues.length != noVariables) {
          throw new RuntimeException("Input malformed: input pattern and values do not match");
        }
        if (noConstraints < 0) {
          noConstraints = constraintList.size();
        } else if (constraintList.size() != noConstraints) {
          throw new RuntimeException("Input malformed: input pattern and values do not match");
        }
        if (noConstraints == 0) {
          throw new RuntimeException("Input values malformed: No constraints given.");
        }
  
        int index = 0;
        constraintValues = new BigInteger[noConstraints][noVariables + 1];
        for (BigInteger[] row : constraintList) {
          if (row.length != noVariables + 1) {
            throw new RuntimeException("Input values malformed: Dimensions do not match " +
                row.length + " != " + (noVariables + 1));
          }
          constraintValues[index] = row;
          index++;
        }
        readInputValues = true;
      }
    }
  
    private void checkConsistency() throws RuntimeException {
      if (readInputValues && readInputPattern) {
        for (int i = 0; i < constraintValues.length; i++) {
          for (int j = 0; j < constraintValues[0].length; j++) {
            if (constraintValues[i][j] == null &&
                (constraintPattern[i][j] == myId || constraintPattern[i][j] == 0)) {
              throw new RuntimeException( 
                  "Input malformed: constraint value (" + i + "," + j + ") missing");
            }
          }
        }
        for (int i = 0; i < costValues.length; i++) {
          if (costValues[i] == null && (costPattern[i] == myId || costPattern[i] == 0)) {
            throw new RuntimeException("Input malformed: cost value " + i + " missing");
          }
        }
      }
    }
  
    private BigInteger[] parseValueLine(String line) {
      String[] fields = line.split(",");
      BigInteger[] values = new BigInteger[fields.length];
      for (int i = 0; i < fields.length; i++) {
        try {
          values[i] = new BigInteger(fields[i].trim());
        } catch (NumberFormatException e) {
          values[i] = null;
        }
      }
      return values;
    }
  
    @Override
    public boolean isRead() {
      return (readInputValues && readInputPattern);
    }
  
    @Override
    public int getOutputId() {
      // TODO: Read this somehow, for now just output player 1
      return 1;
    }
  
  
  }