/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013, 2014 Damien P. George
 * Copyright (c) 2014-2017 Paul Sokolovsky
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "py/builtin.h"
#include "py/objlist.h"
#include "py/objtuple.h"
#include "py/objstr.h"
#include "py/objint.h"
#include "py/objtype.h"
#include "py/stream.h"
#include "py/smallint.h"
#include "py/runtime.h"

#if MICROPY_PY_SYS

#include "genhdr/mpversion.h"

// defined per port; type of these is irrelevant, just need pointer
extern struct _mp_dummy_t mp_sys_stdin_obj;
extern struct _mp_dummy_t mp_sys_stdout_obj;
extern struct _mp_dummy_t mp_sys_stderr_obj;

#if MICROPY_PY_IO && MICROPY_PY_SYS_STDFILES
const mp_print_t mp_sys_stdout_print = {&mp_sys_stdout_obj, mp_stream_write_adaptor};
#endif

// version - Python language version that this implementation conforms to, as a string
STATIC const MP_DEFINE_STR_OBJ(version_obj, "3.4.0");

// version_info - Python language version that this implementation conforms to, as a tuple of ints
#define I(n) MP_OBJ_NEW_SMALL_INT(n)
// TODO: CPython is now at 5-element array, but save 2 els so far...
STATIC const mp_obj_tuple_t mp_sys_version_info_obj = {{&mp_type_tuple}, 3, {I(3), I(4), I(0)}};

// sys.implementation object
// this holds the MicroPython version
STATIC const mp_obj_tuple_t mp_sys_implementation_version_info_obj = {
 {&mp_type_tuple},
 3,
 { I(MICROPY_VERSION_MAJOR), I(MICROPY_VERSION_MINOR), I(MICROPY_VERSION_MICRO) }
};
#if MICROPY_PY_ATTRTUPLE
STATIC const qstr impl_fields[] = { MP_QSTR_name, MP_QSTR_version };
STATIC MP_DEFINE_ATTRTUPLE(
 mp_sys_implementation_obj,
 impl_fields,
 2,
 MP_ROM_QSTR(MP_QSTR_micropython),
 MP_ROM_PTR(&mp_sys_implementation_version_info_obj)
);
#else
STATIC const mp_rom_obj_tuple_t mp_sys_implementation_obj = {
 {&mp_type_tuple},
 2,
 {
 MP_ROM_QSTR(MP_QSTR_micropython),
 MP_ROM_PTR(&mp_sys_implementation_version_info_obj),
 }
};
#endif

#undef I

#ifdef MICROPY_PY_SYS_PLATFORM
// platform - the platform that MicroPython is running on
STATIC const MP_DEFINE_STR_OBJ(platform_obj, MICROPY_PY_SYS_PLATFORM);
#endif

// exit([retval]): raise SystemExit, with optional argument given to the exception
STATIC mp_obj_t mp_sys_exit(size_t n_args, const mp_obj_t *args) {
 mp_obj_t exc;
 if (n_args == 0) {
 exc = mp_obj_new_exception(&mp_type_SystemExit);
 } else {
 exc = mp_obj_new_exception_arg1(&mp_type_SystemExit, args[0]);
 }
 nlr_raise(exc);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_sys_exit_obj, 0, 1, mp_sys_exit);

STATIC mp_obj_t mp_sys_print_exception(size_t n_args, const mp_obj_t *args) {
 #if MICROPY_PY_IO && MICROPY_PY_SYS_STDFILES
 void *stream_obj = &mp_sys_stdout_obj;
 if (n_args > 1) {
 stream_obj = MP_OBJ_TO_PTR(args[1]); // XXX may fail
 }

 mp_print_t print = {stream_obj, mp_stream_write_adaptor};
 mp_obj_print_exception(&print, args[0]);
 #else
 (void)n_args;
 mp_obj_print_exception(&mp_plat_print, args[0]);
 #endif

 return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_sys_print_exception_obj, 1, 2, mp_sys_print_exception);

#if MICROPY_PY_SYS_EXC_INFO
STATIC mp_obj_t mp_sys_exc_info(void) {
 mp_obj_t cur_exc = MP_OBJ_FROM_PTR(MP_STATE_VM(cur_exception));
 mp_obj_tuple_t *t = MP_OBJ_TO_PTR(mp_obj_new_tuple(3, NULL));

 if (cur_exc == MP_OBJ_NULL) {
 t->items[0] = mp_const_none;
 t->items[1] = mp_const_none;
 t->items[2] = mp_const_none;
 return MP_OBJ_FROM_PTR(t);
 }

 t->items[0] = MP_OBJ_FROM_PTR(mp_obj_get_type(cur_exc));
 t->items[1] = cur_exc;
 t->items[2] = mp_const_none;
 return MP_OBJ_FROM_PTR(t);
}
MP_DEFINE_CONST_FUN_OBJ_0(mp_sys_exc_info_obj, mp_sys_exc_info);
#endif

#if MICROPY_PY_SYS_GETSIZEOF
STATIC mp_obj_t mp_sys_getsizeof(mp_obj_t obj) {
 return mp_unary_op(MP_UNARY_OP_SIZEOF, obj);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(mp_sys_getsizeof_obj, mp_sys_getsizeof);
#endif

STATIC const mp_rom_map_elem_t mp_module_sys_globals_table[] = {
 { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_sys) },

 { MP_ROM_QSTR(MP_QSTR_path), MP_ROM_PTR(&MP_STATE_VM(mp_sys_path_obj)) },
 { MP_ROM_QSTR(MP_QSTR_argv), MP_ROM_PTR(&MP_STATE_VM(mp_sys_argv_obj)) },
 { MP_ROM_QSTR(MP_QSTR_version), MP_ROM_PTR(&version_obj) },
 { MP_ROM_QSTR(MP_QSTR_version_info), MP_ROM_PTR(&mp_sys_version_info_obj) },
 { MP_ROM_QSTR(MP_QSTR_implementation), MP_ROM_PTR(&mp_sys_implementation_obj) },
 #ifdef MICROPY_PY_SYS_PLATFORM
 { MP_ROM_QSTR(MP_QSTR_platform), MP_ROM_PTR(&platform_obj) },
 #endif
 #if MP_ENDIANNESS_LITTLE
 { MP_ROM_QSTR(MP_QSTR_byteorder), MP_ROM_QSTR(MP_QSTR_little) },
 #else
 { MP_ROM_QSTR(MP_QSTR_byteorder), MP_ROM_QSTR(MP_QSTR_big) },
 #endif

 #if MICROPY_PY_SYS_MAXSIZE
 #if MICROPY_LONGINT_IMPL == MICROPY_LONGINT_IMPL_NONE
 // Maximum mp_int_t value is not representable as small int, so we have
 // little choice but to use MP_SMALL_INT_MAX. Apps also should be careful
 // to not try to compare sys.maxsize to some literal number (as this
 // number might not fit in available int size), but instead count number
 // of "one" bits in sys.maxsize.
 { MP_ROM_QSTR(MP_QSTR_maxsize), MP_ROM_INT(MP_SMALL_INT_MAX) },
 #else
 { MP_ROM_QSTR(MP_QSTR_maxsize), MP_ROM_PTR(&mp_maxsize_obj) },
 #endif
 #endif

 #if MICROPY_PY_SYS_EXIT
 { MP_ROM_QSTR(MP_QSTR_exit), MP_ROM_PTR(&mp_sys_exit_obj) },
 #endif

 #if MICROPY_PY_SYS_STDFILES
 { MP_ROM_QSTR(MP_QSTR_stdin), MP_ROM_PTR(&mp_sys_stdin_obj) },
 { MP_ROM_QSTR(MP_QSTR_stdout), MP_ROM_PTR(&mp_sys_stdout_obj) },
 { MP_ROM_QSTR(MP_QSTR_stderr), MP_ROM_PTR(&mp_sys_stderr_obj) },
 #endif

 #if MICROPY_PY_SYS_MODULES
 { MP_ROM_QSTR(MP_QSTR_modules), MP_ROM_PTR(&MP_STATE_VM(mp_loaded_modules_dict)) },
 #endif
 #if MICROPY_PY_SYS_EXC_INFO
 { MP_ROM_QSTR(MP_QSTR_exc_info), MP_ROM_PTR(&mp_sys_exc_info_obj) },
 #endif
 #if MICROPY_PY_SYS_GETSIZEOF
 { MP_ROM_QSTR(MP_QSTR_getsizeof), MP_ROM_PTR(&mp_sys_getsizeof_obj) },
 #endif

 /*
 * Extensions to CPython
 */

 { MP_ROM_QSTR(MP_QSTR_print_exception), MP_ROM_PTR(&mp_sys_print_exception_obj) },
};

STATIC MP_DEFINE_CONST_DICT(mp_module_sys_globals, mp_module_sys_globals_table);

const mp_obj_module_t mp_module_sys = {
 .base = { &mp_type_module },
 .globals = (mp_obj_dict_t*)&mp_module_sys_globals,
};

#endif