#include "rb_lapack.h"

extern VOID zhetri_(char* uplo, integer* n, doublecomplex* a, integer* lda, integer* ipiv, doublecomplex* work, integer* info);


static VALUE
rblapack_zhetri(int argc, VALUE *argv, VALUE self){
  VALUE rblapack_uplo;
  char uplo; 
  VALUE rblapack_a;
  doublecomplex *a; 
  VALUE rblapack_ipiv;
  integer *ipiv; 
  VALUE rblapack_info;
  integer info; 
  VALUE rblapack_a_out__;
  doublecomplex *a_out__;
  doublecomplex *work;

  integer lda;
  integer n;

  VALUE rblapack_options;
  if (argc > 0 && TYPE(argv[argc-1]) == T_HASH) {
    argc--;
    rblapack_options = argv[argc];
    if (rb_hash_aref(rblapack_options, sHelp) == Qtrue) {
      printf("%s\n", "USAGE:\n  info, a = NumRu::Lapack.zhetri( uplo, a, ipiv, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n      SUBROUTINE ZHETRI( UPLO, N, A, LDA, IPIV, WORK, INFO )\n\n*  Purpose\n*  =======\n*\n*  ZHETRI computes the inverse of a complex Hermitian indefinite matrix\n*  A using the factorization A = U*D*U**H or A = L*D*L**H computed by\n*  ZHETRF.\n*\n\n*  Arguments\n*  =========\n*\n*  UPLO    (input) CHARACTER*1\n*          Specifies whether the details of the factorization are stored\n*          as an upper or lower triangular matrix.\n*          = 'U':  Upper triangular, form is A = U*D*U**H;\n*          = 'L':  Lower triangular, form is A = L*D*L**H.\n*\n*  N       (input) INTEGER\n*          The order of the matrix A.  N >= 0.\n*\n*  A       (input/output) COMPLEX*16 array, dimension (LDA,N)\n*          On entry, the block diagonal matrix D and the multipliers\n*          used to obtain the factor U or L as computed by ZHETRF.\n*\n*          On exit, if INFO = 0, the (Hermitian) inverse of the original\n*          matrix.  If UPLO = 'U', the upper triangular part of the\n*          inverse is formed and the part of A below the diagonal is not\n*          referenced; if UPLO = 'L' the lower triangular part of the\n*          inverse is formed and the part of A above the diagonal is\n*          not referenced.\n*\n*  LDA     (input) INTEGER\n*          The leading dimension of the array A.  LDA >= max(1,N).\n*\n*  IPIV    (input) INTEGER array, dimension (N)\n*          Details of the interchanges and the block structure of D\n*          as determined by ZHETRF.\n*\n*  WORK    (workspace) COMPLEX*16 array, dimension (N)\n*\n*  INFO    (output) INTEGER\n*          = 0: successful exit\n*          < 0: if INFO = -i, the i-th argument had an illegal value\n*          > 0: if INFO = i, D(i,i) = 0; the matrix is singular and its\n*               inverse could not be computed.\n*\n\n*  =====================================================================\n*\n\n");
      return Qnil;
    }
    if (rb_hash_aref(rblapack_options, sUsage) == Qtrue) {
      printf("%s\n", "USAGE:\n  info, a = NumRu::Lapack.zhetri( uplo, a, ipiv, [:usage => usage, :help => help])\n");
      return Qnil;
    } 
  } else
    rblapack_options = Qnil;
  if (argc != 3 && argc != 3)
    rb_raise(rb_eArgError,"wrong number of arguments (%d for 3)", argc);
  rblapack_uplo = argv[0];
  rblapack_a = argv[1];
  rblapack_ipiv = argv[2];
  if (argc == 3) {
  } else if (rblapack_options != Qnil) {
  } else {
  }

  uplo = StringValueCStr(rblapack_uplo)[0];
  if (!NA_IsNArray(rblapack_ipiv))
    rb_raise(rb_eArgError, "ipiv (3th argument) must be NArray");
  if (NA_RANK(rblapack_ipiv) != 1)
    rb_raise(rb_eArgError, "rank of ipiv (3th argument) must be %d", 1);
  n = NA_SHAPE0(rblapack_ipiv);
  if (NA_TYPE(rblapack_ipiv) != NA_LINT)
    rblapack_ipiv = na_change_type(rblapack_ipiv, NA_LINT);
  ipiv = NA_PTR_TYPE(rblapack_ipiv, integer*);
  if (!NA_IsNArray(rblapack_a))
    rb_raise(rb_eArgError, "a (2th argument) must be NArray");
  if (NA_RANK(rblapack_a) != 2)
    rb_raise(rb_eArgError, "rank of a (2th argument) must be %d", 2);
  lda = NA_SHAPE0(rblapack_a);
  if (NA_SHAPE1(rblapack_a) != n)
    rb_raise(rb_eRuntimeError, "shape 1 of a must be the same as shape 0 of ipiv");
  if (NA_TYPE(rblapack_a) != NA_DCOMPLEX)
    rblapack_a = na_change_type(rblapack_a, NA_DCOMPLEX);
  a = NA_PTR_TYPE(rblapack_a, doublecomplex*);
  {
    na_shape_t shape[2];
    shape[0] = lda;
    shape[1] = n;
    rblapack_a_out__ = na_make_object(NA_DCOMPLEX, 2, shape, cNArray);
  }
  a_out__ = NA_PTR_TYPE(rblapack_a_out__, doublecomplex*);
  MEMCPY(a_out__, a, doublecomplex, NA_TOTAL(rblapack_a));
  rblapack_a = rblapack_a_out__;
  a = a_out__;
  work = ALLOC_N(doublecomplex, (n));

  zhetri_(&uplo, &n, a, &lda, ipiv, work, &info);

  free(work);
  rblapack_info = INT2NUM(info);
  return rb_ary_new3(2, rblapack_info, rblapack_a);
}

void
init_lapack_zhetri(VALUE mLapack, VALUE sH, VALUE sU, VALUE zero){
  sHelp = sH;
  sUsage = sU;
  rblapack_ZERO = zero;

  rb_define_module_function(mLapack, "zhetri", rblapack_zhetri, -1);
}
