// gpio_controller.go
package business

import (
	"fmt"
	"os"
	"strconv"
	"time"
)

const BuzzerGPIO = 109

// TriggerBuzzer 触发蜂鸣器响指定秒数
func TriggerBuzzer(seconds int) {
	if seconds <= 0 {
		seconds = 10
	}

	fmt.Printf("蜂鸣器开始响铃 %d 秒...\n", seconds)

	gpioPath := fmt.Sprintf("/sys/class/gpio/gpio%d", BuzzerGPIO)

	// 1. 强制导出（即使已经导出也没事）
	os.WriteFile("/sys/class/gpio/export", []byte(strconv.Itoa(BuzzerGPIO)), 0666)
	time.Sleep(50 * time.Millisecond)

	// 2. 强制设为输出
	os.WriteFile(fmt.Sprintf("%s/direction", gpioPath), []byte("out"), 0666)
	time.Sleep(10 * time.Millisecond)

	// 3. 拉高 → 响
	if err := os.WriteFile(fmt.Sprintf("%s/value", gpioPath), []byte("1"), 0666); err != nil {
		fmt.Printf("GPIO拉高失败: %v\n", err)
	} else {
		fmt.Println("GPIO109 已拉高 → 蜂鸣器响！")
	}

	time.Sleep(time.Duration(seconds) * time.Second)

	// 4. 拉低 → 停
	if err := os.WriteFile(fmt.Sprintf("%s/value", gpioPath), []byte("0"), 0666); err != nil {
		fmt.Printf("GPIO拉低失败: %v\n", err)
	} else {
		fmt.Println("GPIO109 已拉低 → 蜂鸣器停止")
	}
}