/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013, 2014 Damien P. George
 *
 * 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 <stdio.h>
#include <assert.h>

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

#if MICROPY_PY_BUILTINS_FLOAT
#include <math.h>
#endif

#if MICROPY_PY_IO
extern struct _mp_dummy_t mp_sys_stdout_obj; // type is irrelevant, just need pointer
#endif

// args[0] is function from class body
// args[1] is class name
// args[2:] are base objects
STATIC mp_obj_t mp_builtin___build_class__(size_t n_args, const mp_obj_t *args) {
    assert(2 <= n_args);

    // set the new classes __locals__ object
    mp_obj_dict_t *old_locals = mp_locals_get();
    mp_obj_t class_locals = mp_obj_new_dict(0);
    mp_locals_set(MP_OBJ_TO_PTR(class_locals));

    // call the class code
    mp_obj_t cell = mp_call_function_0(args[0]);

    // restore old __locals__ object
    mp_locals_set(old_locals);

    // get the class type (meta object) from the base objects
    mp_obj_t meta;
    if (n_args == 2) {
        // no explicit bases, so use 'type'
        meta = MP_OBJ_FROM_PTR(&mp_type_type);
    } else {
        // use type of first base object
        meta = MP_OBJ_FROM_PTR(mp_obj_get_type(args[2]));
    }

    // TODO do proper metaclass resolution for multiple base objects

    // create the new class using a call to the meta object
    mp_obj_t meta_args[3];
    meta_args[0] = args[1]; // class name
    meta_args[1] = mp_obj_new_tuple(n_args - 2, args + 2); // tuple of bases
    meta_args[2] = class_locals; // dict of members
    mp_obj_t new_class = mp_call_function_n_kw(meta, 3, 0, meta_args);

    // store into cell if needed
    if (cell != mp_const_none) {
        mp_obj_cell_set(cell, new_class);
    }

    return new_class;
}
MP_DEFINE_CONST_FUN_OBJ_VAR(mp_builtin___build_class___obj, 2, mp_builtin___build_class__);

STATIC mp_obj_t mp_builtin_abs(mp_obj_t o_in) {
    return mp_unary_op(MP_UNARY_OP_ABS, o_in);
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_abs_obj, mp_builtin_abs);

STATIC mp_obj_t mp_builtin_all(mp_obj_t o_in) {
    mp_obj_iter_buf_t iter_buf;
    mp_obj_t iterable = mp_getiter(o_in, &iter_buf);
    mp_obj_t item;
    while ((item = mp_iternext(iterable)) != MP_OBJ_STOP_ITERATION) {
        if (!mp_obj_is_true(item)) {
            return mp_const_false;
        }
    }
    return mp_const_true;
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_all_obj, mp_builtin_all);

STATIC mp_obj_t mp_builtin_any(mp_obj_t o_in) {
    mp_obj_iter_buf_t iter_buf;
    mp_obj_t iterable = mp_getiter(o_in, &iter_buf);
    mp_obj_t item;
    while ((item = mp_iternext(iterable)) != MP_OBJ_STOP_ITERATION) {
        if (mp_obj_is_true(item)) {
            return mp_const_true;
        }
    }
    return mp_const_false;
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_any_obj, mp_builtin_any);

STATIC mp_obj_t mp_builtin_bin(mp_obj_t o_in) {
    mp_obj_t args[] = { MP_OBJ_NEW_QSTR(MP_QSTR__brace_open__colon__hash_b_brace_close_), o_in };
    return mp_obj_str_format(MP_ARRAY_SIZE(args), args, NULL);
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_bin_obj, mp_builtin_bin);

STATIC mp_obj_t mp_builtin_callable(mp_obj_t o_in) {
    if (mp_obj_is_callable(o_in)) {
        return mp_const_true;
    } else {
        return mp_const_false;
    }
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_callable_obj, mp_builtin_callable);

STATIC mp_obj_t mp_builtin_chr(mp_obj_t o_in) {
    #if MICROPY_PY_BUILTINS_STR_UNICODE
    mp_uint_t c = mp_obj_get_int(o_in);
    if (c >= 0x110000) {
        mp_raise_ValueError(MP_ERROR_TEXT("chr() arg not in range(0x110000)"));
    }
    VSTR_FIXED(buf, 4);
    vstr_add_char(&buf, c);
    return mp_obj_new_str_via_qstr(buf.buf, buf.len);
    #else
    mp_int_t ord = mp_obj_get_int(o_in);
    if (0 <= ord && ord <= 0xff) {
        uint8_t str[1] = {ord};
        return mp_obj_new_str_via_qstr((char *)str, 1);
    } else {
        mp_raise_ValueError(MP_ERROR_TEXT("chr() arg not in range(256)"));
    }
    #endif
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_chr_obj, mp_builtin_chr);

STATIC mp_obj_t mp_builtin_dir(size_t n_args, const mp_obj_t *args) {
    mp_obj_t dir = mp_obj_new_list(0, NULL);
    if (n_args == 0) {
        // Make a list of names in the local namespace
        mp_obj_dict_t *dict = mp_locals_get();
        for (size_t i = 0; i < dict->map.alloc; i++) {
            if (mp_map_slot_is_filled(&dict->map, i)) {
                mp_obj_list_append(dir, dict->map.table[i].key);
            }
        }
    } else { // n_args == 1
        // Make a list of names in the given object
        // Implemented by probing all possible qstrs with mp_load_method_maybe
        size_t nqstr = QSTR_TOTAL();
        for (size_t i = MP_QSTR_ + 1; i < nqstr; ++i) {
            mp_obj_t dest[2];
            mp_load_method_protected(args[0], i, dest, false);
            if (dest[0] != MP_OBJ_NULL) {
                #if MICROPY_PY_ALL_SPECIAL_METHODS
                // Support for __dir__: see if we can dispatch to this special method
                // This relies on MP_QSTR__dir__ being first after MP_QSTR_
                if (i == MP_QSTR___dir__ && dest[1] != MP_OBJ_NULL) {
                    return mp_call_method_n_kw(0, 0, dest);
                }
                #endif
                mp_obj_list_append(dir, MP_OBJ_NEW_QSTR(i));
            }
        }
    }
    return dir;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin_dir_obj, 0, 1, mp_builtin_dir);

STATIC mp_obj_t mp_builtin_divmod(mp_obj_t o1_in, mp_obj_t o2_in) {
    return mp_binary_op(MP_BINARY_OP_DIVMOD, o1_in, o2_in);
}
MP_DEFINE_CONST_FUN_OBJ_2(mp_builtin_divmod_obj, mp_builtin_divmod);

STATIC mp_obj_t mp_builtin_hash(mp_obj_t o_in) {
    // result is guaranteed to be a (small) int
    return mp_unary_op(MP_UNARY_OP_HASH, o_in);
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_hash_obj, mp_builtin_hash);

STATIC mp_obj_t mp_builtin_hex(mp_obj_t o_in) {
    #if MICROPY_PY_BUILTINS_STR_OP_MODULO
    return mp_binary_op(MP_BINARY_OP_MODULO, MP_OBJ_NEW_QSTR(MP_QSTR__percent__hash_x), o_in);
    #else
    mp_obj_t args[] = { MP_OBJ_NEW_QSTR(MP_QSTR__brace_open__colon__hash_x_brace_close_), o_in };
    return mp_obj_str_format(MP_ARRAY_SIZE(args), args, NULL);
    #endif
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_hex_obj, mp_builtin_hex);

#if MICROPY_PY_BUILTINS_INPUT

#include "py/mphal.h"
#include "shared/readline/readline.h"

// A port can define mp_hal_readline if they want to use a custom function here
#ifndef mp_hal_readline
#define mp_hal_readline readline
#endif

STATIC mp_obj_t mp_builtin_input(size_t n_args, const mp_obj_t *args) {
    if (n_args == 1) {
        mp_obj_print(args[0], PRINT_STR);
    }
    vstr_t line;
    vstr_init(&line, 16);
    int ret = mp_hal_readline(&line, "");
    if (ret == CHAR_CTRL_C) {
        mp_raise_type(&mp_type_KeyboardInterrupt);
    }
    if (line.len == 0 && ret == CHAR_CTRL_D) {
        mp_raise_type(&mp_type_EOFError);
    }
    return mp_obj_new_str_from_vstr(&line);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin_input_obj, 0, 1, mp_builtin_input);

#endif

STATIC mp_obj_t mp_builtin_iter(mp_obj_t o_in) {
    return mp_getiter(o_in, NULL);
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_iter_obj, mp_builtin_iter);

#if MICROPY_PY_BUILTINS_MIN_MAX

STATIC mp_obj_t mp_builtin_min_max(size_t n_args, const mp_obj_t *args, mp_map_t *kwargs, mp_uint_t op) {
    mp_map_elem_t *key_elem = mp_map_lookup(kwargs, MP_OBJ_NEW_QSTR(MP_QSTR_key), MP_MAP_LOOKUP);
    mp_map_elem_t *default_elem;
    mp_obj_t key_fn = key_elem == NULL ? MP_OBJ_NULL : key_elem->value;
    if (n_args == 1) {
        // given an iterable
        mp_obj_iter_buf_t iter_buf;
        mp_obj_t iterable = mp_getiter(args[0], &iter_buf);
        mp_obj_t best_key = MP_OBJ_NULL;
        mp_obj_t best_obj = MP_OBJ_NULL;
        mp_obj_t item;
        while ((item = mp_iternext(iterable)) != MP_OBJ_STOP_ITERATION) {
            mp_obj_t key = key_fn == MP_OBJ_NULL ? item : mp_call_function_1(key_fn, item);
            if (best_obj == MP_OBJ_NULL || (mp_binary_op(op, key, best_key) == mp_const_true)) {
                best_key = key;
                best_obj = item;
            }
        }
        if (best_obj == MP_OBJ_NULL) {
            default_elem = mp_map_lookup(kwargs, MP_OBJ_NEW_QSTR(MP_QSTR_default), MP_MAP_LOOKUP);
            if (default_elem != NULL) {
                best_obj = default_elem->value;
            } else {
                mp_raise_ValueError(MP_ERROR_TEXT("arg is an empty sequence"));
            }
        }
        return best_obj;
    } else {
        // given many args
        mp_obj_t best_key = MP_OBJ_NULL;
        mp_obj_t best_obj = MP_OBJ_NULL;
        for (size_t i = 0; i < n_args; i++) {
            mp_obj_t key = key_fn == MP_OBJ_NULL ? args[i] : mp_call_function_1(key_fn, args[i]);
            if (best_obj == MP_OBJ_NULL || (mp_binary_op(op, key, best_key) == mp_const_true)) {
                best_key = key;
                best_obj = args[i];
            }
        }
        return best_obj;
    }
}

STATIC mp_obj_t mp_builtin_max(size_t n_args, const mp_obj_t *args, mp_map_t *kwargs) {
    return mp_builtin_min_max(n_args, args, kwargs, MP_BINARY_OP_MORE);
}
MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_max_obj, 1, mp_builtin_max);

STATIC mp_obj_t mp_builtin_min(size_t n_args, const mp_obj_t *args, mp_map_t *kwargs) {
    return mp_builtin_min_max(n_args, args, kwargs, MP_BINARY_OP_LESS);
}
MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_min_obj, 1, mp_builtin_min);

#endif

#if MICROPY_PY_BUILTINS_NEXT2
STATIC mp_obj_t mp_builtin_next(size_t n_args, const mp_obj_t *args) {
    if (n_args == 1) {
        mp_obj_t ret = mp_iternext_allow_raise(args[0]);
        if (ret == MP_OBJ_STOP_ITERATION) {
            mp_raise_StopIteration(MP_STATE_THREAD(stop_iteration_arg));
        } else {
            return ret;
        }
    } else {
        mp_obj_t ret = mp_iternext(args[0]);
        return ret == MP_OBJ_STOP_ITERATION ? args[1] : ret;
    }
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin_next_obj, 1, 2, mp_builtin_next);
#else
STATIC mp_obj_t mp_builtin_next(mp_obj_t o) {
    mp_obj_t ret = mp_iternext_allow_raise(o);
    if (ret == MP_OBJ_STOP_ITERATION) {
        mp_raise_StopIteration(MP_STATE_THREAD(stop_iteration_arg));
    } else {
        return ret;
    }
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_next_obj, mp_builtin_next);
#endif

STATIC mp_obj_t mp_builtin_oct(mp_obj_t o_in) {
    #if MICROPY_PY_BUILTINS_STR_OP_MODULO
    return mp_binary_op(MP_BINARY_OP_MODULO, MP_OBJ_NEW_QSTR(MP_QSTR__percent__hash_o), o_in);
    #else
    mp_obj_t args[] = { MP_OBJ_NEW_QSTR(MP_QSTR__brace_open__colon__hash_o_brace_close_), o_in };
    return mp_obj_str_format(MP_ARRAY_SIZE(args), args, NULL);
    #endif
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_oct_obj, mp_builtin_oct);

STATIC mp_obj_t mp_builtin_ord(mp_obj_t o_in) {
    size_t len;
    const byte *str = (const byte *)mp_obj_str_get_data(o_in, &len);
    #if MICROPY_PY_BUILTINS_STR_UNICODE
    if (mp_obj_is_str(o_in)) {
        len = utf8_charlen(str, len);
        if (len == 1) {
            return mp_obj_new_int(utf8_get_char(str));
        }
    } else
    #endif
    {
        // a bytes object, or a str without unicode support (don't sign extend the char)
        if (len == 1) {
            return MP_OBJ_NEW_SMALL_INT(str[0]);
        }
    }

    #if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
    mp_raise_TypeError(MP_ERROR_TEXT("ord expects a character"));
    #else
    mp_raise_msg_varg(&mp_type_TypeError,
        MP_ERROR_TEXT("ord() expected a character, but string of length %d found"), (int)len);
    #endif
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_ord_obj, mp_builtin_ord);

STATIC mp_obj_t mp_builtin_pow(size_t n_args, const mp_obj_t *args) {
    switch (n_args) {
        case 2:
            return mp_binary_op(MP_BINARY_OP_POWER, args[0], args[1]);
        default:
            #if !MICROPY_PY_BUILTINS_POW3
            mp_raise_NotImplementedError(MP_ERROR_TEXT("3-arg pow() not supported"));
            #elif MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_MPZ
            return mp_binary_op(MP_BINARY_OP_MODULO, mp_binary_op(MP_BINARY_OP_POWER, args[0], args[1]), args[2]);
            #else
            return mp_obj_int_pow3(args[0], args[1], args[2]);
            #endif
    }
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin_pow_obj, 2, 3, mp_builtin_pow);

STATIC mp_obj_t mp_builtin_print(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
    enum { ARG_sep, ARG_end, ARG_file };
    static const mp_arg_t allowed_args[] = {
        { MP_QSTR_sep, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_QSTR(MP_QSTR__space_)} },
        { MP_QSTR_end, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_QSTR(MP_QSTR__0x0a_)} },
        #if MICROPY_PY_IO && MICROPY_PY_SYS_STDFILES
        { MP_QSTR_file, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_PTR(&mp_sys_stdout_obj)} },
        #endif
    };

    // parse args (a union is used to reduce the amount of C stack that is needed)
    union {
        mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
        size_t len[2];
    } u;
    mp_arg_parse_all(0, NULL, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, u.args);

    #if MICROPY_PY_IO && MICROPY_PY_SYS_STDFILES
    mp_get_stream_raise(u.args[ARG_file].u_obj, MP_STREAM_OP_WRITE);
    mp_print_t print = {MP_OBJ_TO_PTR(u.args[ARG_file].u_obj), mp_stream_write_adaptor};
    #endif

    // extract the objects first because we are going to use the other part of the union
    mp_obj_t sep = u.args[ARG_sep].u_obj;
    mp_obj_t end = u.args[ARG_end].u_obj;
    const char *sep_data = mp_obj_str_get_data(sep, &u.len[0]);
    const char *end_data = mp_obj_str_get_data(end, &u.len[1]);

    for (size_t i = 0; i < n_args; i++) {
        if (i > 0) {
            #if MICROPY_PY_IO && MICROPY_PY_SYS_STDFILES
            mp_stream_write_adaptor(print.data, sep_data, u.len[0]);
            #else
            mp_print_strn(&mp_plat_print, sep_data, u.len[0], 0, 0, 0);
            #endif
        }
        #if MICROPY_PY_IO && MICROPY_PY_SYS_STDFILES
        mp_obj_print_helper(&print, pos_args[i], PRINT_STR);
        #else
        mp_obj_print_helper(&mp_plat_print, pos_args[i], PRINT_STR);
        #endif
    }
    #if MICROPY_PY_IO && MICROPY_PY_SYS_STDFILES
    mp_stream_write_adaptor(print.data, end_data, u.len[1]);
    #else
    mp_print_strn(&mp_plat_print, end_data, u.len[1], 0, 0, 0);
    #endif
    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_print_obj, 0, mp_builtin_print);

STATIC mp_obj_t mp_builtin___repl_print__(mp_obj_t o) {
    if (o != mp_const_none) {
        mp_obj_print_helper(MP_PYTHON_PRINTER, o, PRINT_REPR);
        mp_print_str(MP_PYTHON_PRINTER, "\n");
        #if MICROPY_CAN_OVERRIDE_BUILTINS
        // Set "_" special variable
        mp_obj_t dest[2] = {MP_OBJ_SENTINEL, o};
        MP_OBJ_TYPE_GET_SLOT(&mp_type_module, attr)(MP_OBJ_FROM_PTR(&mp_module_builtins), MP_QSTR__, dest);
        #endif
    }
    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin___repl_print___obj, mp_builtin___repl_print__);

STATIC mp_obj_t mp_builtin_repr(mp_obj_t o_in) {
    vstr_t vstr;
    mp_print_t print;
    vstr_init_print(&vstr, 16, &print);
    mp_obj_print_helper(&print, o_in, PRINT_REPR);
    return mp_obj_new_str_from_utf8_vstr(&vstr);
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_repr_obj, mp_builtin_repr);

STATIC mp_obj_t mp_builtin_round(size_t n_args, const mp_obj_t *args) {
    mp_obj_t o_in = args[0];
    if (mp_obj_is_int(o_in)) {
        if (n_args <= 1) {
            return o_in;
        }

        #if !MICROPY_PY_BUILTINS_ROUND_INT
        mp_raise_NotImplementedError(NULL);
        #else
        mp_int_t num_dig = mp_obj_get_int(args[1]);
        if (num_dig >= 0) {
            return o_in;
        }

        mp_obj_t mult = mp_binary_op(MP_BINARY_OP_POWER, MP_OBJ_NEW_SMALL_INT(10), MP_OBJ_NEW_SMALL_INT(-num_dig));
        mp_obj_t half_mult = mp_binary_op(MP_BINARY_OP_FLOOR_DIVIDE, mult, MP_OBJ_NEW_SMALL_INT(2));
        mp_obj_t modulo = mp_binary_op(MP_BINARY_OP_MODULO, o_in, mult);
        mp_obj_t rounded = mp_binary_op(MP_BINARY_OP_SUBTRACT, o_in, modulo);
        if (mp_obj_is_true(mp_binary_op(MP_BINARY_OP_MORE, half_mult, modulo))) {
            return rounded;
        } else if (mp_obj_is_true(mp_binary_op(MP_BINARY_OP_MORE, modulo, half_mult))) {
            return mp_binary_op(MP_BINARY_OP_ADD, rounded, mult);
        } else {
            // round to even number
            mp_obj_t floor = mp_binary_op(MP_BINARY_OP_FLOOR_DIVIDE, o_in, mult);
            if (mp_obj_is_true(mp_binary_op(MP_BINARY_OP_AND, floor, MP_OBJ_NEW_SMALL_INT(1)))) {
                return mp_binary_op(MP_BINARY_OP_ADD, rounded, mult);
            } else {
                return rounded;
            }
        }
        #endif
    }
    #if MICROPY_PY_BUILTINS_FLOAT
    mp_float_t val = mp_obj_get_float(o_in);
    if (n_args > 1) {
        mp_int_t num_dig = mp_obj_get_int(args[1]);
        mp_float_t mult = MICROPY_FLOAT_C_FUN(pow)(10, (mp_float_t)num_dig);
        // TODO may lead to overflow
        mp_float_t rounded = MICROPY_FLOAT_C_FUN(nearbyint)(val * mult) / mult;
        return mp_obj_new_float(rounded);
    }
    mp_float_t rounded = MICROPY_FLOAT_C_FUN(nearbyint)(val);
    return mp_obj_new_int_from_float(rounded);
    #else
    mp_int_t r = mp_obj_get_int(o_in);
    return mp_obj_new_int(r);
    #endif
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin_round_obj, 1, 2, mp_builtin_round);

STATIC mp_obj_t mp_builtin_sum(size_t n_args, const mp_obj_t *args) {
    mp_obj_t value;
    switch (n_args) {
        case 1:
            value = MP_OBJ_NEW_SMALL_INT(0);
            break;
        default:
            value = args[1];
            break;
    }
    mp_obj_iter_buf_t iter_buf;
    mp_obj_t iterable = mp_getiter(args[0], &iter_buf);
    mp_obj_t item;
    while ((item = mp_iternext(iterable)) != MP_OBJ_STOP_ITERATION) {
        value = mp_binary_op(MP_BINARY_OP_ADD, value, item);
    }
    return value;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin_sum_obj, 1, 2, mp_builtin_sum);

STATIC mp_obj_t mp_builtin_sorted(size_t n_args, const mp_obj_t *args, mp_map_t *kwargs) {
    if (n_args > 1) {
        mp_raise_TypeError(MP_ERROR_TEXT("must use keyword argument for key function"));
    }
    mp_obj_t self = mp_obj_list_make_new(&mp_type_list, 1, 0, args);
    mp_obj_list_sort(1, &self, kwargs);

    return self;
}
MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_sorted_obj, 1, mp_builtin_sorted);

// See mp_load_attr() if making any changes
static inline mp_obj_t mp_load_attr_default(mp_obj_t base, qstr attr, mp_obj_t defval) {
    mp_obj_t dest[2];
    // use load_method, raising or not raising exception
    if (defval == MP_OBJ_NULL) {
        mp_load_method(base, attr, dest);
    } else {
        mp_load_method_protected(base, attr, dest, false);
    }
    if (dest[0] == MP_OBJ_NULL) {
        return defval;
    } else if (dest[1] == MP_OBJ_NULL) {
        // load_method returned just a normal attribute
        return dest[0];
    } else {
        // load_method returned a method, so build a bound method object
        return mp_obj_new_bound_meth(dest[0], dest[1]);
    }
}

STATIC mp_obj_t mp_builtin_getattr(size_t n_args, const mp_obj_t *args) {
    mp_obj_t defval = MP_OBJ_NULL;
    if (n_args > 2) {
        defval = args[2];
    }
    return mp_load_attr_default(args[0], mp_obj_str_get_qstr(args[1]), defval);
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin_getattr_obj, 2, 3, mp_builtin_getattr);

STATIC mp_obj_t mp_builtin_setattr(mp_obj_t base, mp_obj_t attr, mp_obj_t value) {
    mp_store_attr(base, mp_obj_str_get_qstr(attr), value);
    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_3(mp_builtin_setattr_obj, mp_builtin_setattr);

#if MICROPY_CPYTHON_COMPAT
STATIC mp_obj_t mp_builtin_delattr(mp_obj_t base, mp_obj_t attr) {
    return mp_builtin_setattr(base, attr, MP_OBJ_NULL);
}
MP_DEFINE_CONST_FUN_OBJ_2(mp_builtin_delattr_obj, mp_builtin_delattr);
#endif

STATIC mp_obj_t mp_builtin_hasattr(mp_obj_t object_in, mp_obj_t attr_in) {
    qstr attr = mp_obj_str_get_qstr(attr_in);
    mp_obj_t dest[2];
    mp_load_method_protected(object_in, attr, dest, false);
    return mp_obj_new_bool(dest[0] != MP_OBJ_NULL);
}
MP_DEFINE_CONST_FUN_OBJ_2(mp_builtin_hasattr_obj, mp_builtin_hasattr);

STATIC mp_obj_t mp_builtin_globals(void) {
    return MP_OBJ_FROM_PTR(mp_globals_get());
}
MP_DEFINE_CONST_FUN_OBJ_0(mp_builtin_globals_obj, mp_builtin_globals);

STATIC mp_obj_t mp_builtin_locals(void) {
    return MP_OBJ_FROM_PTR(mp_locals_get());
}
MP_DEFINE_CONST_FUN_OBJ_0(mp_builtin_locals_obj, mp_builtin_locals);

// These are defined in terms of MicroPython API functions right away
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_id_obj, mp_obj_id);
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_len_obj, mp_obj_len);

STATIC const mp_rom_map_elem_t mp_module_builtins_globals_table[] = {
    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_builtins) },

    // built-in core functions
    { MP_ROM_QSTR(MP_QSTR___build_class__), MP_ROM_PTR(&mp_builtin___build_class___obj) },
    { MP_ROM_QSTR(MP_QSTR___import__), MP_ROM_PTR(&mp_builtin___import___obj) },
    { MP_ROM_QSTR(MP_QSTR___repl_print__), MP_ROM_PTR(&mp_builtin___repl_print___obj) },

    // built-in types
    { MP_ROM_QSTR(MP_QSTR_bool), MP_ROM_PTR(&mp_type_bool) },
    { MP_ROM_QSTR(MP_QSTR_bytes), MP_ROM_PTR(&mp_type_bytes) },
    #if MICROPY_PY_BUILTINS_BYTEARRAY
    { MP_ROM_QSTR(MP_QSTR_bytearray), MP_ROM_PTR(&mp_type_bytearray) },
    #endif
    #if MICROPY_PY_BUILTINS_COMPLEX
    { MP_ROM_QSTR(MP_QSTR_complex), MP_ROM_PTR(&mp_type_complex) },
    #endif
    { MP_ROM_QSTR(MP_QSTR_dict), MP_ROM_PTR(&mp_type_dict) },
    #if MICROPY_PY_BUILTINS_ENUMERATE
    { MP_ROM_QSTR(MP_QSTR_enumerate), MP_ROM_PTR(&mp_type_enumerate) },
    #endif
    #if MICROPY_PY_BUILTINS_FILTER
    { MP_ROM_QSTR(MP_QSTR_filter), MP_ROM_PTR(&mp_type_filter) },
    #endif
    #if MICROPY_PY_BUILTINS_FLOAT
    { MP_ROM_QSTR(MP_QSTR_float), MP_ROM_PTR(&mp_type_float) },
    #endif
    #if MICROPY_PY_BUILTINS_SET && MICROPY_PY_BUILTINS_FROZENSET
    { MP_ROM_QSTR(MP_QSTR_frozenset), MP_ROM_PTR(&mp_type_frozenset) },
    #endif
    { MP_ROM_QSTR(MP_QSTR_int), MP_ROM_PTR(&mp_type_int) },
    { MP_ROM_QSTR(MP_QSTR_list), MP_ROM_PTR(&mp_type_list) },
    { MP_ROM_QSTR(MP_QSTR_map), MP_ROM_PTR(&mp_type_map) },
    #if MICROPY_PY_BUILTINS_MEMORYVIEW
    { MP_ROM_QSTR(MP_QSTR_memoryview), MP_ROM_PTR(&mp_type_memoryview) },
    #endif
    { MP_ROM_QSTR(MP_QSTR_object), MP_ROM_PTR(&mp_type_object) },
    #if MICROPY_PY_BUILTINS_PROPERTY
    { MP_ROM_QSTR(MP_QSTR_property), MP_ROM_PTR(&mp_type_property) },
    #endif
    { MP_ROM_QSTR(MP_QSTR_range), MP_ROM_PTR(&mp_type_range) },
    #if MICROPY_PY_BUILTINS_REVERSED
    { MP_ROM_QSTR(MP_QSTR_reversed), MP_ROM_PTR(&mp_type_reversed) },
    #endif
    #if MICROPY_PY_BUILTINS_SET
    { MP_ROM_QSTR(MP_QSTR_set), MP_ROM_PTR(&mp_type_set) },
    #endif
    #if MICROPY_PY_BUILTINS_SLICE
    { MP_ROM_QSTR(MP_QSTR_slice), MP_ROM_PTR(&mp_type_slice) },
    #endif
    { MP_ROM_QSTR(MP_QSTR_str), MP_ROM_PTR(&mp_type_str) },
    { MP_ROM_QSTR(MP_QSTR_super), MP_ROM_PTR(&mp_type_super) },
    { MP_ROM_QSTR(MP_QSTR_tuple), MP_ROM_PTR(&mp_type_tuple) },
    { MP_ROM_QSTR(MP_QSTR_type), MP_ROM_PTR(&mp_type_type) },
    { MP_ROM_QSTR(MP_QSTR_zip), MP_ROM_PTR(&mp_type_zip) },

    { MP_ROM_QSTR(MP_QSTR_classmethod), MP_ROM_PTR(&mp_type_classmethod) },
    { MP_ROM_QSTR(MP_QSTR_staticmethod), MP_ROM_PTR(&mp_type_staticmethod) },

    // built-in objects
    { MP_ROM_QSTR(MP_QSTR_Ellipsis), MP_ROM_PTR(&mp_const_ellipsis_obj) },
    #if MICROPY_PY_BUILTINS_NOTIMPLEMENTED
    { MP_ROM_QSTR(MP_QSTR_NotImplemented), MP_ROM_PTR(&mp_const_notimplemented_obj) },
    #endif

    // built-in user functions
    { MP_ROM_QSTR(MP_QSTR_abs), MP_ROM_PTR(&mp_builtin_abs_obj) },
    { MP_ROM_QSTR(MP_QSTR_all), MP_ROM_PTR(&mp_builtin_all_obj) },
    { MP_ROM_QSTR(MP_QSTR_any), MP_ROM_PTR(&mp_builtin_any_obj) },
    { MP_ROM_QSTR(MP_QSTR_bin), MP_ROM_PTR(&mp_builtin_bin_obj) },
    { MP_ROM_QSTR(MP_QSTR_callable), MP_ROM_PTR(&mp_builtin_callable_obj) },
    #if MICROPY_PY_BUILTINS_COMPILE
    { MP_ROM_QSTR(MP_QSTR_compile), MP_ROM_PTR(&mp_builtin_compile_obj) },
    #endif
    { MP_ROM_QSTR(MP_QSTR_chr), MP_ROM_PTR(&mp_builtin_chr_obj) },
    #if MICROPY_CPYTHON_COMPAT
    { MP_ROM_QSTR(MP_QSTR_delattr), MP_ROM_PTR(&mp_builtin_delattr_obj) },
    #endif
    { MP_ROM_QSTR(MP_QSTR_dir), MP_ROM_PTR(&mp_builtin_dir_obj) },
    { MP_ROM_QSTR(MP_QSTR_divmod), MP_ROM_PTR(&mp_builtin_divmod_obj) },
    #if MICROPY_PY_BUILTINS_EVAL_EXEC
    { MP_ROM_QSTR(MP_QSTR_eval), MP_ROM_PTR(&mp_builtin_eval_obj) },
    { MP_ROM_QSTR(MP_QSTR_exec), MP_ROM_PTR(&mp_builtin_exec_obj) },
    #endif
    #if MICROPY_PY_BUILTINS_EXECFILE
    { MP_ROM_QSTR(MP_QSTR_execfile), MP_ROM_PTR(&mp_builtin_execfile_obj) },
    #endif
    { MP_ROM_QSTR(MP_QSTR_getattr), MP_ROM_PTR(&mp_builtin_getattr_obj) },
    { MP_ROM_QSTR(MP_QSTR_setattr), MP_ROM_PTR(&mp_builtin_setattr_obj) },
    { MP_ROM_QSTR(MP_QSTR_globals), MP_ROM_PTR(&mp_builtin_globals_obj) },
    { MP_ROM_QSTR(MP_QSTR_hasattr), MP_ROM_PTR(&mp_builtin_hasattr_obj) },
    { MP_ROM_QSTR(MP_QSTR_hash), MP_ROM_PTR(&mp_builtin_hash_obj) },
    #if MICROPY_PY_BUILTINS_HELP
    { MP_ROM_QSTR(MP_QSTR_help), MP_ROM_PTR(&mp_builtin_help_obj) },
    #endif
    { MP_ROM_QSTR(MP_QSTR_hex), MP_ROM_PTR(&mp_builtin_hex_obj) },
    { MP_ROM_QSTR(MP_QSTR_id), MP_ROM_PTR(&mp_builtin_id_obj) },
    #if MICROPY_PY_BUILTINS_INPUT
    { MP_ROM_QSTR(MP_QSTR_input), MP_ROM_PTR(&mp_builtin_input_obj) },
    #endif
    { MP_ROM_QSTR(MP_QSTR_isinstance), MP_ROM_PTR(&mp_builtin_isinstance_obj) },
    { MP_ROM_QSTR(MP_QSTR_issubclass), MP_ROM_PTR(&mp_builtin_issubclass_obj) },
    { MP_ROM_QSTR(MP_QSTR_iter), MP_ROM_PTR(&mp_builtin_iter_obj) },
    { MP_ROM_QSTR(MP_QSTR_len), MP_ROM_PTR(&mp_builtin_len_obj) },
    { MP_ROM_QSTR(MP_QSTR_locals), MP_ROM_PTR(&mp_builtin_locals_obj) },
    #if MICROPY_PY_BUILTINS_MIN_MAX
    { MP_ROM_QSTR(MP_QSTR_max), MP_ROM_PTR(&mp_builtin_max_obj) },
    { MP_ROM_QSTR(MP_QSTR_min), MP_ROM_PTR(&mp_builtin_min_obj) },
    #endif
    { MP_ROM_QSTR(MP_QSTR_next), MP_ROM_PTR(&mp_builtin_next_obj) },
    { MP_ROM_QSTR(MP_QSTR_oct), MP_ROM_PTR(&mp_builtin_oct_obj) },
    #if MICROPY_PY_IO
    { MP_ROM_QSTR(MP_QSTR_open), MP_ROM_PTR(&mp_builtin_open_obj) },
    #endif
    { MP_ROM_QSTR(MP_QSTR_ord), MP_ROM_PTR(&mp_builtin_ord_obj) },
    { MP_ROM_QSTR(MP_QSTR_pow), MP_ROM_PTR(&mp_builtin_pow_obj) },
    { MP_ROM_QSTR(MP_QSTR_print), MP_ROM_PTR(&mp_builtin_print_obj) },
    { MP_ROM_QSTR(MP_QSTR_repr), MP_ROM_PTR(&mp_builtin_repr_obj) },
    { MP_ROM_QSTR(MP_QSTR_round), MP_ROM_PTR(&mp_builtin_round_obj) },
    { MP_ROM_QSTR(MP_QSTR_sorted), MP_ROM_PTR(&mp_builtin_sorted_obj) },
    { MP_ROM_QSTR(MP_QSTR_sum), MP_ROM_PTR(&mp_builtin_sum_obj) },

    // built-in exceptions
    { MP_ROM_QSTR(MP_QSTR_BaseException), MP_ROM_PTR(&mp_type_BaseException) },
    { MP_ROM_QSTR(MP_QSTR_ArithmeticError), MP_ROM_PTR(&mp_type_ArithmeticError) },
    { MP_ROM_QSTR(MP_QSTR_AssertionError), MP_ROM_PTR(&mp_type_AssertionError) },
    { MP_ROM_QSTR(MP_QSTR_AttributeError), MP_ROM_PTR(&mp_type_AttributeError) },
    { MP_ROM_QSTR(MP_QSTR_EOFError), MP_ROM_PTR(&mp_type_EOFError) },
    { MP_ROM_QSTR(MP_QSTR_Exception), MP_ROM_PTR(&mp_type_Exception) },
    { MP_ROM_QSTR(MP_QSTR_GeneratorExit), MP_ROM_PTR(&mp_type_GeneratorExit) },
    { MP_ROM_QSTR(MP_QSTR_ImportError), MP_ROM_PTR(&mp_type_ImportError) },
    { MP_ROM_QSTR(MP_QSTR_IndentationError), MP_ROM_PTR(&mp_type_IndentationError) },
    { MP_ROM_QSTR(MP_QSTR_IndexError), MP_ROM_PTR(&mp_type_IndexError) },
    { MP_ROM_QSTR(MP_QSTR_KeyboardInterrupt), MP_ROM_PTR(&mp_type_KeyboardInterrupt) },
    { MP_ROM_QSTR(MP_QSTR_KeyError), MP_ROM_PTR(&mp_type_KeyError) },
    { MP_ROM_QSTR(MP_QSTR_LookupError), MP_ROM_PTR(&mp_type_LookupError) },
    { MP_ROM_QSTR(MP_QSTR_MemoryError), MP_ROM_PTR(&mp_type_MemoryError) },
    { MP_ROM_QSTR(MP_QSTR_NameError), MP_ROM_PTR(&mp_type_NameError) },
    { MP_ROM_QSTR(MP_QSTR_NotImplementedError), MP_ROM_PTR(&mp_type_NotImplementedError) },
    { MP_ROM_QSTR(MP_QSTR_OSError), MP_ROM_PTR(&mp_type_OSError) },
    { MP_ROM_QSTR(MP_QSTR_OverflowError), MP_ROM_PTR(&mp_type_OverflowError) },
    { MP_ROM_QSTR(MP_QSTR_RuntimeError), MP_ROM_PTR(&mp_type_RuntimeError) },
    #if MICROPY_PY_ASYNC_AWAIT
    { MP_ROM_QSTR(MP_QSTR_StopAsyncIteration), MP_ROM_PTR(&mp_type_StopAsyncIteration) },
    #endif
    { MP_ROM_QSTR(MP_QSTR_StopIteration), MP_ROM_PTR(&mp_type_StopIteration) },
    { MP_ROM_QSTR(MP_QSTR_SyntaxError), MP_ROM_PTR(&mp_type_SyntaxError) },
    { MP_ROM_QSTR(MP_QSTR_SystemExit), MP_ROM_PTR(&mp_type_SystemExit) },
    { MP_ROM_QSTR(MP_QSTR_TypeError), MP_ROM_PTR(&mp_type_TypeError) },
    #if MICROPY_PY_BUILTINS_STR_UNICODE
    { MP_ROM_QSTR(MP_QSTR_UnicodeError), MP_ROM_PTR(&mp_type_UnicodeError) },
    #endif
    { MP_ROM_QSTR(MP_QSTR_ValueError), MP_ROM_PTR(&mp_type_ValueError) },
    #if MICROPY_EMIT_NATIVE
    { MP_ROM_QSTR(MP_QSTR_ViperTypeError), MP_ROM_PTR(&mp_type_ViperTypeError) },
    #endif
    { MP_ROM_QSTR(MP_QSTR_ZeroDivisionError), MP_ROM_PTR(&mp_type_ZeroDivisionError) },

    // Extra builtins as defined by a port
    MICROPY_PORT_BUILTINS
    MICROPY_PORT_EXTRA_BUILTINS
};

MP_DEFINE_CONST_DICT(mp_module_builtins_globals, mp_module_builtins_globals_table);

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

MP_REGISTER_MODULE(MP_QSTR_builtins, mp_module_builtins);