#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
#include "driver/gpio.h"
#include "esp_log.h"

#define CONFIG_LOG_MAXIMUM_LEVEL   5
#define LED_PIN       GPIO_NUM_13
#define BUTTON_PIN    GPIO_NUM_35
#define DEBOUNCE_TIME 30

static const char *TAG = "BUTTON_APP";
static SemaphoreHandle_t btn_sem;

static void button_task(void *pv) {
  bool last = 1;  // 上拉電阻的預設狀態為1

  while (1) {
    bool curr = gpio_get_level(BUTTON_PIN);

    if (last == 1 && curr == 0) {
      vTaskDelay(pdMS_TO_TICKS(DEBOUNCE_TIME));

      if (gpio_get_level(BUTTON_PIN) == 0) {
        xSemaphoreGive(btn_sem);  // 發送「按鈕事件」

        // 等待放開按鍵
        while (gpio_get_level(BUTTON_PIN) == 0) {
          vTaskDelay(pdMS_TO_TICKS(10));
        }
      }
    }

    last = curr;
    vTaskDelay(pdMS_TO_TICKS(10));
  }
}

static void led_task(void *pv) {
  bool led_state = false;

  while (1) {
    // 等待「按鍵事件」
    if (xSemaphoreTake(btn_sem, portMAX_DELAY)) {
      led_state = !led_state;
      gpio_set_level(LED_PIN, led_state);
      ESP_LOGI(TAG, "LED：%s", led_state ? "開" : "關");
    }
  }
}

void app_main(void) {
  esp_log_level_set(TAG, ESP_LOG_VERBOSE);
  btn_sem = xSemaphoreCreateBinary();  // 建立二元信號量

  // LED 初始化
  gpio_config_t led_conf = {
    .pin_bit_mask = 1ULL << LED_PIN,
    .mode = GPIO_MODE_OUTPUT,          // 輸出模式
  };
  gpio_config(&led_conf);

  // Button 初始化
  gpio_config_t btn_conf = {
    .pin_bit_mask = 1ULL << BUTTON_PIN,
    .mode = GPIO_MODE_INPUT,           // 輸入模式
    .pull_up_en = GPIO_PULLUP_ENABLE,  // 啟用上拉電阻
  };
  gpio_config(&btn_conf);

  xTaskCreate(button_task, "button_task", 2048, NULL, 5, NULL);
  xTaskCreate(led_task, "led_task", 2048, NULL, 4, NULL);
}