#include "rb_lapack.h"

extern VOID ztrttf_(char* transr, char* uplo, integer* n, doublecomplex* a, integer* lda, doublecomplex* arf, integer* info);


static VALUE
rblapack_ztrttf(int argc, VALUE *argv, VALUE self){
  VALUE rblapack_transr;
  char transr; 
  VALUE rblapack_uplo;
  char uplo; 
  VALUE rblapack_a;
  doublecomplex *a; 
  VALUE rblapack_arf;
  doublecomplex *arf; 
  VALUE rblapack_info;
  integer info; 

  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  arf, info = NumRu::Lapack.ztrttf( transr, uplo, a, [:usage => usage, :help => help])\n\n\nFORTRAN MANUAL\n      SUBROUTINE ZTRTTF( TRANSR, UPLO, N, A, LDA, ARF, INFO )\n\n*  Purpose\n*  =======\n*\n*  ZTRTTF copies a triangular matrix A from standard full format (TR)\n*  to rectangular full packed format (TF) .\n*\n\n*  Arguments\n*  =========\n*\n*  TRANSR   (input) CHARACTER*1\n*          = 'N':  ARF in Normal mode is wanted;\n*          = 'C':  ARF in Conjugate Transpose mode is wanted;\n*\n*  UPLO    (input) CHARACTER*1\n*          = 'U':  A is upper triangular;\n*          = 'L':  A is lower triangular.\n*\n*  N       (input) INTEGER\n*          The order of the matrix A.  N >= 0.\n*\n*  A       (input) COMPLEX*16 array, dimension ( LDA, N ) \n*          On entry, the triangular matrix A.  If UPLO = 'U', the\n*          leading N-by-N upper triangular part of the array A contains\n*          the upper triangular matrix, and the strictly lower\n*          triangular part of A is not referenced.  If UPLO = 'L', the\n*          leading N-by-N lower triangular part of the array A contains\n*          the lower triangular matrix, and the strictly upper\n*          triangular part of A is not referenced.\n*\n*  LDA     (input) INTEGER\n*          The leading dimension of the matrix A.  LDA >= max(1,N).\n*\n*  ARF     (output) COMPLEX*16 array, dimension ( N*(N+1)/2 ),\n*          On exit, the upper or lower triangular matrix A stored in\n*          RFP format. For a further discussion see Notes below.\n*\n*  INFO    (output) INTEGER\n*          = 0:  successful exit\n*          < 0:  if INFO = -i, the i-th argument had an illegal value\n*\n\n*  Further Details\n*  ===============\n*\n*  We first consider Standard Packed Format when N is even.\n*  We give an example where N = 6.\n*\n*      AP is Upper             AP is Lower\n*\n*   00 01 02 03 04 05       00\n*      11 12 13 14 15       10 11\n*         22 23 24 25       20 21 22\n*            33 34 35       30 31 32 33\n*               44 45       40 41 42 43 44\n*                  55       50 51 52 53 54 55\n*\n*\n*  Let TRANSR = `N'. RFP holds AP as follows:\n*  For UPLO = `U' the upper trapezoid A(0:5,0:2) consists of the last\n*  three columns of AP upper. The lower triangle A(4:6,0:2) consists of\n*  conjugate-transpose of the first three columns of AP upper.\n*  For UPLO = `L' the lower trapezoid A(1:6,0:2) consists of the first\n*  three columns of AP lower. The upper triangle A(0:2,0:2) consists of\n*  conjugate-transpose of the last three columns of AP lower.\n*  To denote conjugate we place -- above the element. This covers the\n*  case N even and TRANSR = `N'.\n*\n*         RFP A                   RFP A\n*\n*                                -- -- --\n*        03 04 05                33 43 53\n*                                   -- --\n*        13 14 15                00 44 54\n*                                      --\n*        23 24 25                10 11 55\n*\n*        33 34 35                20 21 22\n*        --\n*        00 44 45                30 31 32\n*        -- --\n*        01 11 55                40 41 42\n*        -- -- --\n*        02 12 22                50 51 52\n*\n*  Now let TRANSR = `C'. RFP A in both UPLO cases is just the conjugate-\n*  transpose of RFP A above. One therefore gets:\n*\n*\n*           RFP A                   RFP A\n*\n*     -- -- -- --                -- -- -- -- -- --\n*     03 13 23 33 00 01 02    33 00 10 20 30 40 50\n*     -- -- -- -- --                -- -- -- -- --\n*     04 14 24 34 44 11 12    43 44 11 21 31 41 51\n*     -- -- -- -- -- --                -- -- -- --\n*     05 15 25 35 45 55 22    53 54 55 22 32 42 52\n*\n*\n*  We next  consider Standard Packed Format when N is odd.\n*  We give an example where N = 5.\n*\n*     AP is Upper                 AP is Lower\n*\n*   00 01 02 03 04              00\n*      11 12 13 14              10 11\n*         22 23 24              20 21 22\n*            33 34              30 31 32 33\n*               44              40 41 42 43 44\n*\n*\n*  Let TRANSR = `N'. RFP holds AP as follows:\n*  For UPLO = `U' the upper trapezoid A(0:4,0:2) consists of the last\n*  three columns of AP upper. The lower triangle A(3:4,0:1) consists of\n*  conjugate-transpose of the first two   columns of AP upper.\n*  For UPLO = `L' the lower trapezoid A(0:4,0:2) consists of the first\n*  three columns of AP lower. The upper triangle A(0:1,1:2) consists of\n*  conjugate-transpose of the last two   columns of AP lower.\n*  To denote conjugate we place -- above the element. This covers the\n*  case N odd  and TRANSR = `N'.\n*\n*         RFP A                   RFP A\n*\n*                                   -- --\n*        02 03 04                00 33 43\n*                                      --\n*        12 13 14                10 11 44\n*\n*        22 23 24                20 21 22\n*        --\n*        00 33 34                30 31 32\n*        -- --\n*        01 11 44                40 41 42\n*\n*  Now let TRANSR = `C'. RFP A in both UPLO cases is just the conjugate-\n*  transpose of RFP A above. One therefore gets:\n*\n*\n*           RFP A                   RFP A\n*\n*     -- -- --                   -- -- -- -- -- --\n*     02 12 22 00 01             00 10 20 30 40 50\n*     -- -- -- --                   -- -- -- -- --\n*     03 13 23 33 11             33 11 21 31 41 51\n*     -- -- -- -- --                   -- -- -- --\n*     04 14 24 34 44             43 44 22 32 42 52\n*\n*  =====================================================================\n*\n\n");
      return Qnil;
    }
    if (rb_hash_aref(rblapack_options, sUsage) == Qtrue) {
      printf("%s\n", "USAGE:\n  arf, info = NumRu::Lapack.ztrttf( transr, uplo, a, [: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_transr = argv[0];
  rblapack_uplo = argv[1];
  rblapack_a = argv[2];
  if (argc == 3) {
  } else if (rblapack_options != Qnil) {
  } else {
  }

  transr = StringValueCStr(rblapack_transr)[0];
  if (!NA_IsNArray(rblapack_a))
    rb_raise(rb_eArgError, "a (3th argument) must be NArray");
  if (NA_RANK(rblapack_a) != 2)
    rb_raise(rb_eArgError, "rank of a (3th argument) must be %d", 2);
  lda = NA_SHAPE0(rblapack_a);
  n = NA_SHAPE1(rblapack_a);
  if (NA_TYPE(rblapack_a) != NA_DCOMPLEX)
    rblapack_a = na_change_type(rblapack_a, NA_DCOMPLEX);
  a = NA_PTR_TYPE(rblapack_a, doublecomplex*);
  uplo = StringValueCStr(rblapack_uplo)[0];
  {
    na_shape_t shape[1];
    shape[0] = ( n*(n+1)/2 );
    rblapack_arf = na_make_object(NA_DCOMPLEX, 1, shape, cNArray);
  }
  arf = NA_PTR_TYPE(rblapack_arf, doublecomplex*);

  ztrttf_(&transr, &uplo, &n, a, &lda, arf, &info);

  rblapack_info = INT2NUM(info);
  return rb_ary_new3(2, rblapack_arf, rblapack_info);
}

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

  rb_define_module_function(mLapack, "ztrttf", rblapack_ztrttf, -1);
}
