#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.h" // 引用此程式庫
#include "driver/gpio.h"
#include "esp_log.h"

// 將編譯階段的日誌等級上限設為5
#define CONFIG_LOG_MAXIMUM_LEVEL  5
#define LED_PIN      GPIO_NUM_13
#define BUTTON_PIN   GPIO_NUM_35
#define DEBOUNCE_TIME 70  // 消除彈跳時間

static const char *TAG = "SWITCH_LED";
static SemaphoreHandle_t xSemaphore;

// 中斷處理函式：只負責送出訊號
static void IRAM_ATTR isr_handler(void* arg) {
  xSemaphoreGiveFromISR(xSemaphore, NULL);
}

void led_task(void* arg) {
  bool led_state = false;

  while (1) {
    // 等待中斷訊號
    if (xSemaphoreTake(xSemaphore, portMAX_DELAY)) {
      vTaskDelay(pdMS_TO_TICKS(DEBOUNCE_TIME)); // 等待電位穩定
      // 確認電位是否真的為低，確保只有「按下」動作有效
      if (gpio_get_level(BUTTON_PIN) == 0) { 
        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);
  xSemaphore = xSemaphoreCreateBinary();

  // LED 配置
  gpio_config_t led_conf = {
    .pin_bit_mask = (1ULL << LED_PIN),
    .mode = GPIO_MODE_OUTPUT,
  };
  gpio_config(&led_conf);

  // 按鈕配置
  gpio_config_t btn_conf = {
    .pin_bit_mask = (1ULL << BUTTON_PIN),
    .mode = GPIO_MODE_INPUT,
    .pull_up_en = GPIO_PULLUP_ENABLE,
    .intr_type = GPIO_INTR_NEGEDGE, // 僅在下降沿（按下）觸發
  };
  gpio_config(&btn_conf);

  gpio_install_isr_service(0);  // 安裝中斷
  gpio_isr_handler_add(BUTTON_PIN, isr_handler, NULL);

  xTaskCreate(led_task, "led_task", 3000, NULL, 10, NULL);
}