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// This file is part of the CircuitPython project: https://circuitpython.org

//

// SPDX-FileCopyrightText: Copyright (c) 2021 Dan Halbert for Adafruit Industries

//

// SPDX-License-Identifier: MIT

#include "shared-bindings/keypad/Event.h"

#include "shared-bindings/keypad/EventQueue.h"

#include "shared-bindings/supervisor/__init__.h"

#include "shared-module/keypad/EventQueue.h"

// Key number is lower 15 bits of a 16-bit value.

#define EVENT_PRESSED (1 << 15)

#define EVENT_KEY_NUM_MASK ((1 << 15) - 1)

#define EVENT_SIZE_BYTES (sizeof(uint16_t) + sizeof(mp_obj_t))

void common_hal_keypad_eventqueue_construct(keypad_eventqueue_obj_t *self, size_t max_events) {

// Event queue is 16-bit values.

ringbuf_alloc(&self->encoded_events, max_events * EVENT_SIZE_BYTES);

self->overflowed = false;

self->event_handler = NULL;

}

bool common_hal_keypad_eventqueue_get_into(keypad_eventqueue_obj_t *self, keypad_event_obj_t *event) {

int encoded_event = ringbuf_get16(&self->encoded_events);

if (encoded_event == -1) {

return false;

}

mp_obj_t ticks;

ringbuf_get_n(&self->encoded_events, (uint8_t *)&ticks, sizeof(ticks));

// "Construct" using the existing event.

common_hal_keypad_event_construct(event, encoded_event & EVENT_KEY_NUM_MASK, encoded_event & EVENT_PRESSED, ticks);

return true;

}

mp_obj_t common_hal_keypad_eventqueue_get(keypad_eventqueue_obj_t *self) {

keypad_event_obj_t *event = mp_obj_malloc(keypad_event_obj_t, &keypad_event_type);

bool result = common_hal_keypad_eventqueue_get_into(self, event);

if (result) {

return event;

}

#if MICROPY_MALLOC_USES_ALLOCATED_SIZE

m_free(event, sizeof(keypad_event_obj_t));

#else

m_free(event);

#endif

return MP_ROM_NONE;

}

bool common_hal_keypad_eventqueue_get_overflowed(keypad_eventqueue_obj_t *self) {

return self->overflowed;

}

void common_hal_keypad_eventqueue_set_overflowed(keypad_eventqueue_obj_t *self, bool overflowed) {

self->overflowed = overflowed;

}

void common_hal_keypad_eventqueue_clear(keypad_eventqueue_obj_t *self) {

ringbuf_clear(&self->encoded_events);

common_hal_keypad_eventqueue_set_overflowed(self, false);

}

size_t common_hal_keypad_eventqueue_get_length(keypad_eventqueue_obj_t *self) {

return ringbuf_num_filled(&self->encoded_events) / EVENT_SIZE_BYTES;

}

void common_hal_keypad_eventqueue_set_event_handler(keypad_eventqueue_obj_t *self, void (*event_handler)(keypad_eventqueue_obj_t *)) {

self->event_handler = event_handler;

}

bool keypad_eventqueue_record(keypad_eventqueue_obj_t *self, mp_uint_t key_number, bool pressed, mp_obj_t timestamp) {

if (ringbuf_num_empty(&self->encoded_events) == 0) {

// Queue is full. Set the overflow flag. The caller will decide what else to do.

common_hal_keypad_eventqueue_set_overflowed(self, true);

return false;

}

uint16_t encoded_event = key_number & EVENT_KEY_NUM_MASK;

if (pressed) {

encoded_event |= EVENT_PRESSED;

}

ringbuf_put16(&self->encoded_events, encoded_event);

ringbuf_put_n(&self->encoded_events, (uint8_t *)&timestamp, sizeof(mp_obj_t));

if (self->event_handler) {

self->event_handler(self);

}

return true;

}