// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// Mobius Forensic Toolkit
// Copyright (C) 2008,2009,2010,2011,2012,2013,2014,2015,2016,2017,2018,2019,2020,2021,2022,2023,2024 Eduardo Aguiar
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option) any later
// version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
// Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief C++ API module wrapper
//! \author Eduardo Aguiar
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
#include <pymobius.h>
#include <pygil.h>
#include "text_reader.h"
#include "reader.h"
#include <mobius/exception.inc>
#include <mobius/io/bytearray_io.h>
#include <limits>
#include <stdexcept>

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief Check if object type is <i>text_reader</i>
//! \param pyobj Python object
//! \return true/false
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
bool
pymobius_io_text_reader_check (PyObject *pyobj)
{
  return PyObject_IsInstance (pyobj, (PyObject *) &io_text_reader_t);
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief create new object from C++ object
//! \param obj C++ object
//! \return new object
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
PyObject *
pymobius_io_text_reader_to_pyobject (const mobius::io::text_reader& obj)
{
  PyObject *ret = _PyObject_New (&io_text_reader_t);

  if (ret)
    ((io_text_reader_o *) ret)->obj = new mobius::io::text_reader (obj);

  return ret;
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief Create <i>text_reader</i> C++ object from Python object
//! \param pyobj Python object
//! \return text_reader object
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
mobius::io::text_reader
pymobius_io_text_reader_from_pyobject (PyObject *pyobj)
{
  if (!pymobius_io_text_reader_check (pyobj))
    throw std::invalid_argument (mobius::MOBIUS_EXCEPTION_MSG ("argument must be text_reader"));

  return * (reinterpret_cast <io_text_reader_o *>(pyobj)->obj);
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief Read all data from text_reader
//! \param text_reader Pointer to text_reader object
//! \return Data as C++ string
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
static std::string
_read_all (mobius::io::text_reader* text_reader)
{
  std::string ret;
  std::string data = text_reader->read (65536);

  while (!data.empty ())
    {
      ret += data;
      data = text_reader->read (65536);
    }

  return ret;
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief Read method
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
static PyObject *
tp_f_read (io_text_reader_o *self, PyObject *args)
{
  std::uint64_t arg_size = 0;
  constexpr std::uint64_t max_size = std::numeric_limits <std::uint64_t>::max ();

  // parse input args
  try
    {
      arg_size = mobius::py::get_arg_as_uint64_t (args, 0, max_size);
    }
  catch (const std::exception& e)
    {
      mobius::py::set_invalid_type_error (e.what ());
      return nullptr;
    }

  // execute C++ code
  PyObject *ret = nullptr;

  try
    {
      ret = mobius::py::pystring_from_std_string (
               mobius::py::GIL () (
                  (arg_size == max_size) ? _read_all (self->obj) :
                                           self->obj->read (arg_size)
               )
            );
    }
  catch (const std::exception& e)
    {
      mobius::py::set_io_error (e.what ());
    }

  return ret;
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief Methods structure
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
static PyMethodDef tp_methods[] =
{
  {
    (char *) "read",
    (PyCFunction) tp_f_read,
    METH_VARARGS,
    "Read bytes from text_reader"
  },
  {NULL, NULL, 0, NULL} // sentinel
};

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief tp_alloc
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
io_text_reader_o *
io_text_reader_tp_alloc ()
{
  return (io_text_reader_o *) io_text_reader_t.tp_alloc (&io_text_reader_t, 0);
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief tp_dealloc
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
static void
tp_dealloc (io_text_reader_o *self)
{
  delete self->obj;
  Py_TYPE (self)->tp_free ((PyObject*) self);
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief <i>text_reader</i> Constructor
//! \param type Type object
//! \param args Argument list
//! \param kwds Keywords dict
//! \return new <i>text_reader</i> object
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
static PyObject *
tp_new (PyTypeObject *type, PyObject *args, PyObject *)
{
  // Parse input args
  mobius::io::reader arg_reader;
  std::string arg_encoding;

  try
    {
      arg_reader = mobius::py::get_arg_as_cpp (args, 0, pymobius_io_reader_from_pyobject);
      arg_encoding = mobius::py::get_arg_as_std_string (args, 1, "UTF-8");
    }
  catch (const std::exception& e)
    {
      mobius::py::set_invalid_type_error (e.what ());
      return nullptr;
    }

  // Create Python object
  io_text_reader_o *ret = reinterpret_cast <io_text_reader_o *> (type->tp_alloc (type, 0));

  if (ret)
    {
      try
        {
          ret->obj = new mobius::io::text_reader (arg_reader, arg_encoding);
        }
      catch (const std::exception& e)
        {
          Py_DECREF (ret);
          mobius::py::set_runtime_error (e.what ());
          ret = nullptr;
        }
    }

  return reinterpret_cast <PyObject *> (ret);
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief type structure
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
PyTypeObject io_text_reader_t =
{
  PyVarObject_HEAD_INIT (NULL, 0)
  "mobius.io.text_reader",               	   	// tp_name
  sizeof (io_text_reader_o),              	      	// tp_basicsize
  0,                                       		// tp_itemsize
  (destructor) tp_dealloc,  	                   	// tp_dealloc
  0,                                       		// tp_print
  0,                                       		// tp_getattr
  0,                                       		// tp_setattr
  0,                                       		// tp_compare
  0,                                       		// tp_repr
  0,                                       		// tp_as_number
  0,                                       		// tp_as_sequence
  0,                                       		// tp_as_mapping
  0,                                       		// tp_hash
  0,                                       		// tp_call
  0,                                       		// tp_str
  0,                                       		// tp_getattro
  0,                                       		// tp_setattro
  0,                                       		// tp_as_buffer
  Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,		// tp_flags
  "text_reader adaptor for reader objects",            	// tp_doc
  0,                                       		// tp_traverse
  0,                                       		// tp_clear
  0,                                       		// tp_richcompare
  0,                                       		// tp_weaklistoffset
  0,                                       		// tp_iter
  0,                                       		// tp_iternext
  tp_methods,                                  		// tp_methods
  0,                                       		// tp_members
  0,                	                   		// tp_getset
  0,                             	              	// tp_base
  0,                                       		// tp_dict
  0,                                       		// tp_descr_get
  0,                                       		// tp_descr_set
  0,                                       		// tp_dictoffset
  0,                                       		// tp_init
  0,                                       		// tp_alloc
  tp_new,                                    		// tp_new
  0,                                       		// tp_free
  0,                                       		// tp_is_gc
  0,                                       		// tp_bases
  0,                                       		// tp_mro
  0,                                       		// tp_cache
  0,                                       		// tp_subclasses
  0,                                       		// tp_weaklist
  0,                                       		// tp_del
  0,                                       		// tp_version_tag
  0,                                       		// tp_finalize
};
