/* --------------------------------------------------------------
   Application: 01 - Rev1
   Release Type: Sub - Optimal Baseline Code 
   Class: Real Time Systems - Su 2025
   AI Use: Commented inline
---------------------------------------------------------------*/
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"

#define LED_PIN GPIO_NUM_4  // changed per challenge to GPIO 4
#define LED_OFF 0
#define LED_ON 1
#define SHORT_DURATION 250 // tested to work as low as 150, but for 125, period indicated is 120 !
#define LONG_DELAY 10000
#define TINY_DELAY 50

// Global LED state variable
int ledState = LED_OFF;

// Utility function to log with timestamp
void log_task_event(const char *taskName, const char *eventType, TickType_t periodTicks) {
    TickType_t now = xTaskGetTickCount();
    unsigned long time_ms = now * portTICK_PERIOD_MS;
    unsigned long period_ms = periodTicks * portTICK_PERIOD_MS;

    printf("[%8lu ms] %s: %s | Period: %lu ms\n",
           time_ms, taskName, eventType, period_ms);
}

void Beacon_xmit_task(void *pvParameters) {
  TickType_t lastWakeTime = xTaskGetTickCount();  // Initial timestamp

  while (1) {
    ledState = !ledState;
    gpio_set_level(LED_PIN, ledState);

    TickType_t now = xTaskGetTickCount();
    //printf("Beacon Transmit Task period: %lu ms\t", (unsigned long)((now - lastWakeTime) * portTICK_PERIOD_MS));
    log_task_event("XmitTask", ledState ? "LED ON" : "LED OFF", now - lastWakeTime);
    lastWakeTime = now;

    vTaskDelay(pdMS_TO_TICKS(SHORT_DURATION));
  }
}

void Monitor_task(void *pvParameters) {
  TickType_t lastWakeTime = xTaskGetTickCount();  // Initial timestamp

  while (1) {
    TickType_t now = xTaskGetTickCount();
    //printf("\n");
    //printf("MonitorTask period: %lu ms | System time: %lu ms | LED = %s\n",
    //           (unsigned long)((now - lastWakeTime) * portTICK_PERIOD_MS),
    //           (unsigned long)(now * portTICK_PERIOD_MS),
    //           ledState ? "ON" : "OFF");
    char msg[64];
    snprintf(msg, sizeof(msg), "Alive | LED = %s", ledState ? "ON" : "OFF");

    log_task_event("MonitorTask", msg, now - lastWakeTime);
    lastWakeTime = now;
    vTaskDelay(pdMS_TO_TICKS(TINY_DELAY));
    // vTaskDelay(pdMS_TO_TICKS(LONG_DELAY));
  }
}

void app_main() {
  gpio_reset_pin(LED_PIN);
  gpio_set_direction(LED_PIN, GPIO_MODE_OUTPUT);
  // Initially start with a LED_OFF 
  gpio_set_level(LED_PIN, ledState); // Ensure it starts in the OFF state

  xTaskCreate(Beacon_xmit_task, "BeaconXmitTask", 2048, NULL, 1, NULL);
  xTaskCreate(Monitor_task, "MonitorTask", 2048, NULL, 1, NULL);

}