/*
 * SPDX-License-Identifier: AGPL-3.0-only
 * Copyright (c) Camden Dixie O'Brien
 */

#include "buttons.h"

#include "fatal.h"

#include "driver/gpio.h"
#include "esp_log.h"
#include "esp_timer.h"

#define TAG "Buttons"

#define PIN_BITMASK(n) ((uint64_t)1 << n)

#define SNOOZE_PIN GPIO_NUM_34
#define DISMISS_PIN GPIO_NUM_35

#define PRESS_HANDLE_PERIOD_US 300000UL

static bool snooze_pressed;
static bool dismiss_pressed;

static void handle_snooze_interrupt(void *arg)
{
	(void)arg;
	snooze_pressed = true;
}

static void handle_dismiss_interrupt(void *arg)
{
	(void)arg;
	dismiss_pressed = true;
}

static void handle_presses(void *arg)
{
	(void)arg;
	if (snooze_pressed) {
		ESP_LOGI(TAG, "Snooze pressed");
		snooze_pressed = false;
	}
	if (dismiss_pressed) {
		ESP_LOGI(TAG, "Dismiss pressed");
		dismiss_pressed = false;
	}
}

void buttons_init()
{
	esp_err_t error;

	snooze_pressed = false;
	dismiss_pressed = false;

	const gpio_config_t pin_config = {
		.pin_bit_mask = PIN_BITMASK(SNOOZE_PIN) | PIN_BITMASK(DISMISS_PIN),
		.mode = GPIO_MODE_INPUT,
		.pull_down_en = GPIO_PULLDOWN_ENABLE,
		.intr_type = GPIO_INTR_POSEDGE,
	};
	error = gpio_config(&pin_config);
	if (error != ESP_OK) {
		ESP_LOGE(TAG, "Error configuring GPIO: %04x", error);
		FATAL();
	}

	error = gpio_install_isr_service(0);
	if (error != ESP_OK) {
		ESP_LOGE(
		    TAG, "Error installing GPIO interrupt service: %04x", error);
		FATAL();
	}
	error = gpio_isr_handler_add(SNOOZE_PIN, &handle_snooze_interrupt, NULL);
	if (error != ESP_OK) {
		ESP_LOGE(TAG, "Error adding snooze interrupt handler: %04x", error);
	}
	error
	    = gpio_isr_handler_add(DISMISS_PIN, &handle_dismiss_interrupt, NULL);
	if (error != ESP_OK) {
		ESP_LOGE(TAG, "Error adding snooze interrupt handler: %04x", error);
		FATAL();
	}

	const esp_timer_create_args_t timer_config = {
		.callback = &handle_presses,
		.name = "Buttons press handler",
	};
	esp_timer_handle_t timer;
	error = esp_timer_create(&timer_config, &timer);
	if (error != ESP_OK) {
		ESP_LOGE(TAG, "Error creating timer: %04x", error);
		FATAL();
	}

	error = esp_timer_start_periodic(timer, PRESS_HANDLE_PERIOD_US);
	if (error != ESP_OK) {
		ESP_LOGE(TAG, "Error starting timer: %04x", error);
		FATAL();
	}
}