/*
 * SPDX-FileCopyrightText: 2023 Helmut Pozimski <helmut@pozimski.eu>
 *
 * SPDX-License-Identifier: GPL-2.0-only
 */

#include <stdint.h>

#include <esp_err.h>
#include <freertos/FreeRTOS.h>
#include <freertos/event_groups.h>
#include <esp_log.h>


#include "time_conversion.h"
#include "storage.h"
#include "alarm.h"
#include "ds3231.h"

#define SECONDS_PER_DAY 86400
#define TAG "alarm-task"

static esp_err_t determine_wakeup_minute_for_day(struct tm* local_time, int16_t* result) {
	esp_err_t ret = read_wakeup_time_tm(local_time, result);
	if (ret == ESP_OK) {
		return ESP_OK;
	}
	ret |= read_wakeup_time_str(WEEK_DAYS[local_time->tm_wday], result);
	return ret;
}

static uint16_t calculate_current_minute(struct tm* local_time) {
	return local_time->tm_hour * 60 + local_time->tm_min;
}

static uint32_t calculate_current_second(struct tm* local_time) {
	return local_time->tm_hour * 60 * 60 + local_time->tm_min * 60 + local_time->tm_sec;
}

static uint32_t determine_next_wakeup_time(struct tm* current_time) {
	struct tm *local_time = convert_to_local(current_time);
	uint32_t current_second = calculate_current_second(local_time);
	int16_t wakeup_minute_today;
	
	esp_err_t ret = determine_wakeup_minute_for_day(local_time, &wakeup_minute_today);
	
	if (ret == ESP_OK) {
		if (wakeup_minute_today >= (current_second / 60)) {
			return wakeup_minute_today * 60 - current_second;
		}
	}
	
	current_time->tm_mday++;
	struct tm *local_time_tomorrow = convert_to_local(current_time);
	int16_t wakeup_minute_tomorrow;
	ret = determine_wakeup_minute_for_day(local_time_tomorrow, &wakeup_minute_tomorrow);
	
	if (ret == ESP_OK) {
		ESP_LOGI(TAG, "Wakeup minute for tomorrow: %d", wakeup_minute_tomorrow);
		if (wakeup_minute_tomorrow != -1) {
			return (SECONDS_PER_DAY - current_second) + wakeup_minute_tomorrow * 60;
		}
	}
	return SECONDS_PER_DAY;
	
}

static void assert_alarm(uint8_t* button_pressed_flag) {
	*button_pressed_flag = 0;
	for (uint8_t i = 0; i < 60; i++) {
		beep(100);
		vTaskDelay(100 / portTICK_PERIOD_MS);
		beep(100);
		vTaskDelay(2000 / portTICK_PERIOD_MS);
		if (*button_pressed_flag) {
			break;		
		}
	}
}
 
void alarm_task(void *pvParameters) {
	ESP_LOGI(TAG, "Starting alarm task");
	struct tm current_time;
	alarm_init(200);
	uint8_t* button_pressed_flag = (uint8_t*) pvParameters;
	
	while (1) {
		ds3231_read_date_time(&current_time);
		struct tm *local_time = convert_to_local(&current_time);
		uint16_t current_minute = calculate_current_minute(local_time);
		int16_t wakeup_minute_today;
		esp_err_t ret = determine_wakeup_minute_for_day(local_time, &wakeup_minute_today);
		ESP_LOGI(TAG, "Current minute: %d", current_minute);
		ESP_LOGI(TAG, "Wakeup minute for today: %d", wakeup_minute_today);
		if (ret == ESP_OK && current_minute == wakeup_minute_today) {
			assert_alarm(button_pressed_flag);
		}
		ds3231_read_date_time(&current_time);
		uint32_t seconds_to_wait = determine_next_wakeup_time(&current_time);
		ESP_LOGI(TAG, "Sleeping for %ld seconds", seconds_to_wait);
		vTaskDelay(seconds_to_wait * 1000 / portTICK_PERIOD_MS);
	}	
	vTaskDelete( NULL ); 
}