#include "ikarus.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <math.h>


ikp
ikrt_string_to_flonum(ikp x, ikpcb* pcb){
  double v = strtod(string_data(x), NULL);
  ikp r = ik_alloc(pcb, flonum_size) + vector_tag;
  ref(r, -vector_tag) = (ikp)flonum_tag;
  flonum_data(r) = v;
  return r;
}

ikp
ikrt_fl_plus(ikp x, ikp y,ikpcb* pcb){
  ikp r = ik_alloc(pcb, flonum_size) + vector_tag;
  ref(r, -vector_tag) = (ikp)flonum_tag;
  flonum_data(r) = flonum_data(x) + flonum_data(y);
  return r;
}

ikp
ikrt_fl_minus(ikp x, ikp y,ikpcb* pcb){
  ikp r = ik_alloc(pcb, flonum_size) + vector_tag;
  ref(r, -vector_tag) = (ikp)flonum_tag;
  flonum_data(r) = flonum_data(x) - flonum_data(y);
  return r;
}

ikp
ikrt_fl_times(ikp x, ikp y,ikpcb* pcb){
  ikp r = ik_alloc(pcb, flonum_size) + vector_tag;
  ref(r, -vector_tag) = (ikp)flonum_tag;
  flonum_data(r) = flonum_data(x) * flonum_data(y);
  return r;
}

ikp
ikrt_fl_div(ikp x, ikp y,ikpcb* pcb){
  ikp r = ik_alloc(pcb, flonum_size) + vector_tag;
  ref(r, -vector_tag) = (ikp)flonum_tag;
  flonum_data(r) = flonum_data(x) / flonum_data(y);
  return r;
}

ikp
ikrt_fl_invert(ikp x, ikpcb* pcb){
  ikp r = ik_alloc(pcb, flonum_size) + vector_tag;
  ref(r, -vector_tag) = (ikp)flonum_tag;
  flonum_data(r) = 1.0 / flonum_data(x);
  return r;
}

ikp
ikrt_fl_sin(ikp x, ikpcb* pcb){
  ikp r = ik_alloc(pcb, flonum_size) + vector_tag;
  ref(r, -vector_tag) = (ikp)flonum_tag;
  flonum_data(r) = sin(flonum_data(x));
  return r;
}

ikp
ikrt_fl_cos(ikp x, ikpcb* pcb){
  ikp r = ik_alloc(pcb, flonum_size) + vector_tag;
  ref(r, -vector_tag) = (ikp)flonum_tag;
  flonum_data(r) = cos(flonum_data(x));
  return r;
}


ikp
ikrt_fl_sqrt(ikp x, ikpcb* pcb){
  ikp r = ik_alloc(pcb, flonum_size) + vector_tag;
  ref(r, -vector_tag) = (ikp)flonum_tag;
  flonum_data(r) = sqrt(flonum_data(x));
  return r;
}




ikp
ikrt_fl_atan(ikp x, ikpcb* pcb){
  ikp r = ik_alloc(pcb, flonum_size) + vector_tag;
  ref(r, -vector_tag) = (ikp)flonum_tag;
  flonum_data(r) = atan(flonum_data(x));
  return r;
}



ikp
ikrt_fx_sin(ikp x, ikpcb* pcb){
  ikp r = ik_alloc(pcb, flonum_size) + vector_tag;
  ref(r, -vector_tag) = (ikp)flonum_tag;
  flonum_data(r) = sin(unfix(x));
  return r;
}

ikp
ikrt_fx_cos(ikp x, ikpcb* pcb){
  ikp r = ik_alloc(pcb, flonum_size) + vector_tag;
  ref(r, -vector_tag) = (ikp)flonum_tag;
  flonum_data(r) = cos(unfix(x));
  return r;
}

ikp
ikrt_fx_sqrt(ikp x, ikpcb* pcb){
  ikp r = ik_alloc(pcb, flonum_size) + vector_tag;
  ref(r, -vector_tag) = (ikp)flonum_tag;
  flonum_data(r) = sqrt(unfix(x));
  return r;
}



ikp
ikrt_fx_atan(ikp x, ikpcb* pcb){
  ikp r = ik_alloc(pcb, flonum_size) + vector_tag;
  ref(r, -vector_tag) = (ikp)flonum_tag;
  flonum_data(r) = atan(unfix(x));
  return r;
}

ikp
ikrt_flonum_to_bytevector(ikp x, ikp bv, ikpcb* pcb){
  if(tagof(x) == vector_tag){
    if(ref(x,-vector_tag) == flonum_tag){
      char* buff = (char*) bv + off_bytevector_data;
      int len = unfix(ref(bv, off_bytevector_data));
      int n = snprintf(buff, len-2, "%.12G", flonum_data(x));
      if(n >= 0){
        int i=0;
        while ((i<n) && (buff[i] != '.')){ i++; }
        if(i == n){
          buff[i] = '.';
          buff[i+1] = '0';
          buff[i+2] = 0;
          n += 2;
        } else {
          buff[n] = 0;
        }
        ref(bv, off_bytevector_length) = fix(n);
        return bv;
      }
    }
  }
  return false_object;
}

ikp
ikrt_fixnum_to_flonum(ikp x, ikpcb* pcb){
  ikp r = ik_alloc(pcb, flonum_size) + vector_tag;
  ref(r, -vector_tag) = (ikp)flonum_tag;
  flonum_data(r) = unfix(x);
  return r;
}

ikp
ikrt_bignum_to_flonum(ikp x, ikpcb* pcb){
  ikp r = ik_alloc(pcb, flonum_size) + vector_tag;
  ref(r, -vector_tag) = (ikp)flonum_tag;
  unsigned int fst = (unsigned int) ref(x, -vector_tag);
  int limbs = (fst >> bignum_length_shift);
  double fl;
  if(limbs == 1){
    fl = ((unsigned int)ref(x, disp_bignum_data - vector_tag));
  } else if(limbs == 2){
    fl = ((unsigned int)ref(x, wordsize+disp_bignum_data - vector_tag));
    fl *= exp2(32);
    fl += ((unsigned int)ref(x, disp_bignum_data - vector_tag));
  } else {
    fl = 
      ((unsigned int)ref(x, limbs * wordsize - wordsize + 
                            disp_bignum_data - vector_tag));
    fl *= exp2(32);
    fl += ((unsigned int)ref(x, limbs * wordsize - (wordsize*2) +
                                disp_bignum_data - vector_tag));
    fl *= exp2(32);
    fl += ((unsigned int)ref(x, limbs * wordsize - (wordsize*3) +
                                disp_bignum_data - vector_tag));
    fl *= exp2(limbs*wordsize*8-wordsize*8*3);
  }
  if((fst & bignum_sign_mask) != 0){
    fl = -fl;
  }
  flonum_data(r) = fl;
  return r;
}

ikp
ikrt_fl_equal(ikp x, ikp y){
  if(flonum_data(x) == flonum_data(y)){
    return true_object;
  } else {
    return false_object;
  }
}

ikp
ikrt_fl_less_or_equal(ikp x, ikp y){
  if(flonum_data(x) <= flonum_data(y)){
    return true_object;
  } else {
    return false_object;
  }
}

ikp
ikrt_fl_less(ikp x, ikp y){
  if(flonum_data(x) < flonum_data(y)){
    return true_object;
  } else {
    return false_object;
  }
}