/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2017 Paul Sokolovsky
 * Copyright (c) Quectel Wireless Solution, Co., Ltd.All Rights Reserved.
 *
 * 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/mpconfig.h"
#if MICROPY_PY_MACHINE

#include <string.h>

#include "py/obj.h"
#include "py/runtime.h"
#include "extmod/virtpin.h"
#include "extmod/machine_signal.h"

// Signal class

typedef struct _machine_signal_t {
 mp_obj_base_t base;
 mp_obj_t pin;
 bool invert;
} machine_signal_t;

STATIC mp_obj_t signal_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
 mp_obj_t pin;
 bool invert = false;

 #if defined(MICROPY_PY_MACHINE_PIN_MAKE_NEW)
 mp_pin_p_t *pin_p = NULL;

 if (n_args > 0 && mp_obj_is_obj(args[0])) {
 mp_obj_base_t *pin_base = (mp_obj_base_t *)MP_OBJ_TO_PTR(args[0]);
 pin_p = (mp_pin_p_t *)pin_base->type->protocol;
 }

 if (pin_p == NULL) {
 // If first argument isn't a Pin-like object, we filter out "invert"
 // from keyword arguments and pass them all to the exported Pin
 // constructor to create one.
 mp_obj_t *pin_args = mp_local_alloc((n_args + n_kw * 2) * sizeof(mp_obj_t));
 memcpy(pin_args, args, n_args * sizeof(mp_obj_t));
 const mp_obj_t *src = args + n_args;
 mp_obj_t *dst = pin_args + n_args;
 mp_obj_t *sig_value = NULL;
 for (size_t cnt = n_kw; cnt; cnt--) {
 if (*src == MP_OBJ_NEW_QSTR(MP_QSTR_invert)) {
 invert = mp_obj_is_true(src[1]);
 n_kw--;
 } else {
 *dst++ = *src;
 *dst++ = src[1];
 }
 if (*src == MP_OBJ_NEW_QSTR(MP_QSTR_value)) {
 // Value is pertained to Signal, so we should invert
 // it for Pin if needed, and we should do it only when
 // inversion status is guaranteedly known.
 sig_value = dst - 1;
 }
 src += 2;
 }

 if (invert && sig_value != NULL) {
 *sig_value = mp_obj_is_true(*sig_value) ? MP_OBJ_NEW_SMALL_INT(0) : MP_OBJ_NEW_SMALL_INT(1);
 }

 // Here we pass NULL as a type, hoping that mp_pin_make_new()
 // will just ignore it as set a concrete type. If not, we'd need
 // to expose port's "default" pin type too.
 pin = MICROPY_PY_MACHINE_PIN_MAKE_NEW(NULL, n_args, n_kw, pin_args);

 mp_local_free(pin_args);
 } else
 #endif
 // Otherwise there should be 1 or 2 args
 {
 if (n_args == 1) {
 pin = args[0];
 if (n_kw == 0) {
 } else if (n_kw == 1 && args[1] == MP_OBJ_NEW_QSTR(MP_QSTR_invert)) {
 invert = mp_obj_is_true(args[2]);
 } else {
 goto error;
 }
 } else {
 error:
 mp_raise_TypeError(NULL);
 }
 }

 machine_signal_t *o = m_new_obj(machine_signal_t);
 o->base.type = type;
 o->pin = pin;
 o->invert = invert;
 return MP_OBJ_FROM_PTR(o);
}

STATIC mp_uint_t signal_ioctl(mp_obj_t self_in, mp_uint_t request, uintptr_t arg, int *errcode) {
 (void)errcode;
 machine_signal_t *self = MP_OBJ_TO_PTR(self_in);

 switch (request) {
 case MP_PIN_READ: {
 return mp_virtual_pin_read(self->pin) ^ self->invert;
 }
 case MP_PIN_WRITE: {
 mp_virtual_pin_write(self->pin, arg ^ self->invert);
 return 0;
 }
 }
 return -1;
}

// fast method for getting/setting signal value
STATIC mp_obj_t signal_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
 mp_arg_check_num(n_args, n_kw, 0, 1, false);
 if (n_args == 0) {
 // get pin
 return MP_OBJ_NEW_SMALL_INT(mp_virtual_pin_read(self_in));
 } else {
 // set pin
 mp_virtual_pin_write(self_in, mp_obj_is_true(args[0]));
 return mp_const_none;
 }
}

STATIC mp_obj_t signal_value(size_t n_args, const mp_obj_t *args) {
 return signal_call(args[0], n_args - 1, 0, args + 1);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(signal_value_obj, 1, 2, signal_value);

STATIC mp_obj_t signal_on(mp_obj_t self_in) {
 mp_virtual_pin_write(self_in, 1);
 return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(signal_on_obj, signal_on);

STATIC mp_obj_t signal_off(mp_obj_t self_in) {
 mp_virtual_pin_write(self_in, 0);
 return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(signal_off_obj, signal_off);

STATIC const mp_rom_map_elem_t signal_locals_dict_table[] = {
 { MP_ROM_QSTR(MP_QSTR_value), MP_ROM_PTR(&signal_value_obj) },
 { MP_ROM_QSTR(MP_QSTR_on), MP_ROM_PTR(&signal_on_obj) },
 { MP_ROM_QSTR(MP_QSTR_off), MP_ROM_PTR(&signal_off_obj) },
};

STATIC MP_DEFINE_CONST_DICT(signal_locals_dict, signal_locals_dict_table);

STATIC const mp_pin_p_t signal_pin_p = {
 .ioctl = signal_ioctl,
};

const mp_obj_type_t machine_signal_type = {
 { &mp_type_type },
 .name = MP_QSTR_Signal,
 .make_new = signal_make_new,
 .call = signal_call,
 .protocol = &signal_pin_p,
 .locals_dict = (void *)&signal_locals_dict,
};

#endif // MICROPY_PY_MACHINE