#pragma once

#include "altrep.h"

#include "r_utils.h"
#include "vroom_vec.h"

int strtoi(const char* begin, const char* end);

cpp11::integers read_int(vroom_vec_info* info);

class vroom_int : public vroom_vec {

public:
  static R_altrep_class_t class_t;

  static SEXP Make(vroom_vec_info* info) {

    SEXP out = PROTECT(R_MakeExternalPtr(info, R_NilValue, R_NilValue));
    R_RegisterCFinalizerEx(out, vroom_vec::Finalize, FALSE);

    SEXP res = R_new_altrep(class_t, out, R_NilValue);

    UNPROTECT(1);

    MARK_NOT_MUTABLE(res); /* force duplicate on modify */

    return res;
  }

  // ALTREP methods -------------------

  // What gets printed when .Internal(inspect()) is used
  static Rboolean
  Inspect(SEXP x, int, int, int, void (*)(SEXP, int, int, int)) {
    Rprintf(
        "vroom_int (len=%" R_PRIdXLEN_T ", materialized=%s)\n",
        Length(x),
        R_altrep_data2(x) != R_NilValue ? "T" : "F");
    return TRUE;
  }

  // ALTINTEGER methods -----------------

  static SEXP Materialize(SEXP vec) {
    SEXP data2 = R_altrep_data2(vec);
    if (data2 != R_NilValue) {
      return data2;
    }

    auto out = read_int(&Info(vec));
    R_set_altrep_data2(vec, out);

    // Once we have materialized we no longer need the info
    Finalize(R_altrep_data1(vec));

    return out;
  }

  // the element at the index `i`
  static int int_Elt(SEXP vec, R_xlen_t i) {
    SEXP data2 = R_altrep_data2(vec);
    if (data2 != R_NilValue) {
      return INTEGER(data2)[i];
    }

    auto& info = vroom_vec::Info(vec);
    int out = parse_value<int>(
        i, info.column, strtoi, info.errors, "an integer", *info.na);

    info.errors->warn_for_errors();

    return out;
  }

  static void* Dataptr(SEXP vec, Rboolean) {
    return DATAPTR_RW(Materialize(vec));
  }

  // -------- initialize the altrep class with the methods above
  static void Init(DllInfo* dll) {
    vroom_int::class_t = R_make_altinteger_class("vroom_int", "vroom", dll);

    // altrep
    R_set_altrep_Length_method(class_t, Length);
    R_set_altrep_Inspect_method(class_t, Inspect);

    // altvec
    R_set_altvec_Dataptr_method(class_t, Dataptr);
    R_set_altvec_Dataptr_or_null_method(class_t, Dataptr_or_null);
    R_set_altvec_Extract_subset_method(class_t, Extract_subset<vroom_int>);

    // altinteger
    R_set_altinteger_Elt_method(class_t, int_Elt);
  }
};

// Called the package is loaded
[[cpp11::init]] void init_vroom_int(DllInfo* dll);
