/*
   Copyright : Copyright (c) MOSEK ApS, Denmark. All rights reserved.

   File :      sdo1.java

   Purpose :   Solves the following small semidefinite optimization problem
               using the MOSEK API.

               minimize    Tr [2, 1, 0; 1, 2, 1; 0, 1, 2]*X + x0

               subject to  Tr [1, 0, 0; 0, 1, 0; 0, 0, 1]*X + x0           = 1
                           Tr [1, 1, 1; 1, 1, 1; 1, 1, 1]*X      + x1 + x2 = 0.5
                           (x0,x1,x2) \in Q,  X \in PSD
*/
package com.mosek.example;
import mosek.*;

public class sdo1 {
  public static void main(String[] argv) {
    int    numcon      = 2;  /* Number of constraints.              */
    int    numvar      = 3;  /* Number of scalar variables */
    int    dimbarvar[] = {3};         /* Dimension of semidefinite cone */
    int    lenbarvar[] = {3 * (3 + 1) / 2}; /* Number of scalar SD variables  */

    mosek.boundkey bkc[] = { mosek.boundkey.fx,
                             mosek.boundkey.fx
                           };
    double[]     blc     = { 1.0, 0.5 };
    double[]     buc     = { 1.0, 0.5 };

    int[]        barc_i  = {0, 1, 1, 2, 2},
                 barc_j  = {0, 0, 1, 1, 2};
    double[]     barc_v  = {2.0, 1.0, 2.0, 1.0, 2.0};

    int[][]      asub    = {{0}, {1, 2}}; /* column subscripts of A */
    double[][]   aval    = {{1.0}, {1.0, 1.0}};

    int[][]      bara_i  = { {0,   1,   2},   {0,   1 ,  2,   1,   2,   2 } },
                 bara_j  = { {0,   1,   2},   {0,   0 ,  0,   1,   1,   2 } };
    
    double[][]   bara_v  = { {1.0, 1.0, 1.0}, {1.0, 1.0, 1.0, 1.0, 1.0, 1.0}};

    try (Task task = new Task()) {
      // Directs the log task stream to the user specified
      // method task_msg_obj.stream
      task.set_Stream(
        mosek.streamtype.log,
        new mosek.Stream()
      { public void stream(String msg) { System.out.print(msg); }});

      /* Append 'NUMCON' empty constraints.
         The constraints will initially have no bounds. */
      task.appendcons(numcon);

      /* Append 'NUMVAR' variables.
         The variables will initially be fixed at zero (x=0). */
      task.appendvars(numvar);

      /* Append 'NUMBARVAR' semidefinite variables. */
      task.appendbarvars(dimbarvar);

      /* Optionally add a constant term to the objective. */
      task.putcfix(0.0);

      /* Set the linear term c_j in the objective.*/
      task.putcj(0, 1.0);

      for (int j = 0; j < numvar; ++j)
        task.putvarbound(j, mosek.boundkey.fr, -0.0, 0.0);

      /* Set the linear term barc_j in the objective.*/
      {
        long[] idx = new long[1];
        double[] falpha = { 1.0 };
        idx[0] = task.appendsparsesymmat(dimbarvar[0],
                                         barc_i,
                                         barc_j,
                                         barc_v);
        task.putbarcj(0, idx, falpha);
      }

      /* Set the bounds on constraints.
        for i=1, ...,numcon : blc[i] <= constraint i <= buc[i] */

      for (int i = 0; i < numcon; ++i)
        task.putconbound(i,           /* Index of constraint.*/
                         bkc[i],      /* Bound key.*/
                         blc[i],      /* Numerical value of lower bound.*/
                         buc[i]);     /* Numerical value of upper bound.*/

      /* Input A row by row */
      for (int i = 0; i < numcon; ++i)
        task.putarow(i,
                     asub[i],
                     aval[i]);

      /* Append the conic quadratic constraint */
      task.appendafes(3);
      // Diagonal F matrix
      task.putafefentrylist(new long[]{0,1,2}, new int[]{0,1,2}, new double[]{1.0,1.0,1.0});
      task.appendaccseq(task.appendquadraticconedomain(3), 0, null);

      /* Add the first row of barA */
      {
        long[] idx = new long[1];
        double[] falpha = {1.0};
        task.appendsparsesymmat(dimbarvar[0],
                                bara_i[0],
                                bara_j[0],
                                bara_v[0],
                                idx);

        task.putbaraij(0, 0, idx, falpha);
      }

      {
        long[] idx = new long[1];
        double[] falpha = {1.0};
        /* Add the second row of barA */
        task.appendsparsesymmat(dimbarvar[0],
                                bara_i[1],
                                bara_j[1],
                                bara_v[1],
                                idx);

        task.putbaraij(1, 0, idx, falpha);
      }

      /* Run optimizer */
      task.optimize();

      /* Print a summary containing information
         about the solution for debugging purposes*/
      task.solutionsummary (mosek.streamtype.msg);

      mosek.solsta solsta = task.getsolsta (mosek.soltype.itr);

      switch (solsta) {
        case optimal:
          double[] xx = task.getxx(mosek.soltype.itr);
          double[] barx = task.getbarxj(mosek.soltype.itr, 0);    /* Request the interior solution. */
          System.out.println("Optimal primal solution");
          for (int i = 0; i < numvar; ++i)
            System.out.println("x[" + i + "]   : " + xx[i]);

          for (int i = 0; i < lenbarvar[0]; ++i)
            System.out.println("barx[" + i + "]: " + barx[i]);
          break;
        case dual_infeas_cer:
        case prim_infeas_cer:
          System.out.println("Primal or dual infeasibility certificate found.");
          break;
        case unknown:
          System.out.println("The status of the solution could not be determined.");
          break;
        default:
          System.out.println("Other solution status.");
          break;
      }
    }
  }
}