/*
 * 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 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 <string.h>

#include "py/objtuple.h"
#include "py/runtime.h"
#include "py/objstr.h"
#include "py/objnamedtuple.h"

#if MICROPY_PY_COLLECTIONS

size_t mp_obj_namedtuple_find_field(const mp_obj_namedtuple_type_t *type, qstr name) {
 for (size_t i = 0; i < type->n_fields; i++) {
 if (type->fields[i] == name) {
 return i;
 }
 }
 return (size_t)-1;
}

#if MICROPY_PY_COLLECTIONS_NAMEDTUPLE__ASDICT
STATIC mp_obj_t namedtuple_asdict(mp_obj_t self_in) {
 mp_obj_namedtuple_t *self = MP_OBJ_TO_PTR(self_in);
 const qstr *fields = ((mp_obj_namedtuple_type_t *)self->tuple.base.type)->fields;
 mp_obj_t dict = mp_obj_new_dict(self->tuple.len);
 // make it an OrderedDict
 mp_obj_dict_t *dictObj = MP_OBJ_TO_PTR(dict);
 dictObj->base.type = &mp_type_ordereddict;
 dictObj->map.is_ordered = 1;
 for (size_t i = 0; i < self->tuple.len; ++i) {
 mp_obj_dict_store(dict, MP_OBJ_NEW_QSTR(fields[i]), self->tuple.items[i]);
 }
 return dict;
}
MP_DEFINE_CONST_FUN_OBJ_1(namedtuple_asdict_obj, namedtuple_asdict);
#endif

STATIC void namedtuple_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
 (void)kind;
 mp_obj_namedtuple_t *o = MP_OBJ_TO_PTR(o_in);
 mp_printf(print, "%q", o->tuple.base.type->name);
 const qstr *fields = ((mp_obj_namedtuple_type_t *)o->tuple.base.type)->fields;
 mp_obj_attrtuple_print_helper(print, fields, &o->tuple);
}

STATIC void namedtuple_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
 if (dest[0] == MP_OBJ_NULL) {
 // load attribute
 mp_obj_namedtuple_t *self = MP_OBJ_TO_PTR(self_in);
 #if MICROPY_PY_COLLECTIONS_NAMEDTUPLE__ASDICT
 if (attr == MP_QSTR__asdict) {
 dest[0] = MP_OBJ_FROM_PTR(&namedtuple_asdict_obj);
 dest[1] = self_in;
 return;
 }
 #endif
 size_t id = mp_obj_namedtuple_find_field((mp_obj_namedtuple_type_t *)self->tuple.base.type, attr);
 if (id == (size_t)-1) {
 return;
 }
 dest[0] = self->tuple.items[id];
 } else {
 // delete/store attribute
 // provide more detailed error message than we'd get by just returning
 mp_raise_msg(&mp_type_AttributeError, MP_ERROR_TEXT("can't set attribute"));
 }
}

STATIC mp_obj_t namedtuple_make_new(const mp_obj_type_t *type_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
 const mp_obj_namedtuple_type_t *type = (const mp_obj_namedtuple_type_t *)type_in;
 size_t num_fields = type->n_fields;
 if (n_args + n_kw != num_fields) {
 #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE
 mp_arg_error_terse_mismatch();
 #elif MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_NORMAL
 mp_raise_msg_varg(&mp_type_TypeError,
 MP_ERROR_TEXT("function takes %d positional arguments but %d were given"),
 num_fields, n_args + n_kw);
 #elif MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_DETAILED
 mp_raise_msg_varg(&mp_type_TypeError,
 MP_ERROR_TEXT("%q() takes %d positional arguments but %d were given"),
 type->base.name, num_fields, n_args + n_kw);
 #endif
 }

 // Create a tuple and set the type to this namedtuple
 mp_obj_tuple_t *tuple = MP_OBJ_TO_PTR(mp_obj_new_tuple(num_fields, NULL));
 tuple->base.type = type_in;

 // Copy the positional args into the first slots of the namedtuple
 memcpy(&tuple->items[0], args, sizeof(mp_obj_t) * n_args);

 // Fill in the remaining slots with the keyword args
 memset(&tuple->items[n_args], 0, sizeof(mp_obj_t) * n_kw);
 for (size_t i = n_args; i < n_args + 2 * n_kw; i += 2) {
 qstr kw = mp_obj_str_get_qstr(args[i]);
 size_t id = mp_obj_namedtuple_find_field(type, kw);
 if (id == (size_t)-1) {
 #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE
 mp_arg_error_terse_mismatch();
 #else
 mp_raise_msg_varg(&mp_type_TypeError, MP_ERROR_TEXT("unexpected keyword argument '%q'"), kw);
 #endif
 }
 if (tuple->items[id] != MP_OBJ_NULL) {
 #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE
 mp_arg_error_terse_mismatch();
 #else
 mp_raise_msg_varg(&mp_type_TypeError,
 MP_ERROR_TEXT("function got multiple values for argument '%q'"), kw);
 #endif
 }
 tuple->items[id] = args[i + 1];
 }

 return MP_OBJ_FROM_PTR(tuple);
}

mp_obj_namedtuple_type_t *mp_obj_new_namedtuple_base(size_t n_fields, mp_obj_t *fields) {
 mp_obj_namedtuple_type_t *o = m_new_obj_var(mp_obj_namedtuple_type_t, qstr, n_fields);
 memset(&o->base, 0, sizeof(o->base));
 o->n_fields = n_fields;
 for (size_t i = 0; i < n_fields; i++) {
 o->fields[i] = mp_obj_str_get_qstr(fields[i]);
 }
 return o;
}

STATIC mp_obj_t mp_obj_new_namedtuple_type(qstr name, size_t n_fields, mp_obj_t *fields) {
 mp_obj_namedtuple_type_t *o = mp_obj_new_namedtuple_base(n_fields, fields);
 o->base.base.type = &mp_type_type;
 o->base.flags = MP_TYPE_FLAG_EQ_CHECKS_OTHER_TYPE; // can match tuple
 o->base.name = name;
 o->base.print = namedtuple_print;
 o->base.make_new = namedtuple_make_new;
 o->base.unary_op = mp_obj_tuple_unary_op;
 o->base.binary_op = mp_obj_tuple_binary_op;
 o->base.attr = namedtuple_attr;
 o->base.subscr = mp_obj_tuple_subscr;
 o->base.getiter = mp_obj_tuple_getiter;
 o->base.parent = &mp_type_tuple;
 return MP_OBJ_FROM_PTR(o);
}

STATIC mp_obj_t new_namedtuple_type(mp_obj_t name_in, mp_obj_t fields_in) {
 qstr name = mp_obj_str_get_qstr(name_in);
 size_t n_fields;
 mp_obj_t *fields;
 #if MICROPY_CPYTHON_COMPAT
 if (mp_obj_is_str(fields_in)) {
 fields_in = mp_obj_str_split(1, &fields_in);
 }
 #endif
 mp_obj_get_array(fields_in, &n_fields, &fields);
 return mp_obj_new_namedtuple_type(name, n_fields, fields);
}
MP_DEFINE_CONST_FUN_OBJ_2(mp_namedtuple_obj, new_namedtuple_type);

#endif // MICROPY_PY_COLLECTIONS