#include <EEPROM.h>

struct CalibrationData {
    int minValue;
    int maxValue;
    float scaleFactor;
    int offset;
    bool isCalibrated;
};

const int POT_PIN = A0;
const int BTN_CALIBRATE = 2;
const int BTN_RESET_CAL = 3;
const int LED_PIN = 13;

CalibrationData calData;
bool lastButtonState = HIGH;

void setup() {
    pinMode(BTN_CALIBRATE, INPUT_PULLUP);
    pinMode(BTN_RESET_CAL, INPUT_PULLUP);
    pinMode(LED_PIN, OUTPUT);
    
    EEPROM.get(0, calData);
    
    if(!calData.isCalibrated) {
        resetCalibration();
    }
}

void loop() {
    bool buttonState = digitalRead(BTN_CALIBRATE);
    
    if(buttonState == LOW && lastButtonState == HIGH) {
        calibrateSensor();
        delay(300);
    }
    
    if(digitalRead(BTN_RESET_CAL) == LOW) {
        resetCalibration();
        delay(300);
    }
    
    int rawValue = analogRead(POT_PIN);
    int calibratedValue = applyCalibration(rawValue);
    
    int blinkDelay = map(calibratedValue, 0, 1023, 100, 1000);
    digitalWrite(LED_PIN, HIGH);
    delay(blinkDelay / 2);
    digitalWrite(LED_PIN, LOW);
    delay(blinkDelay / 2);
    
    lastButtonState = buttonState;
}

void calibrateSensor() {
    waitForButton();
    calData.minValue = analogRead(POT_PIN);
    
    waitForButton();
    calData.maxValue = analogRead(POT_PIN);
    
    calData.scaleFactor = 1023.0 / (calData.maxValue - calData.minValue);
    calData.offset = calData.minValue;
    calData.isCalibrated = true;

    EEPROM.put(0, calData);
}

void resetCalibration() {
    calData.minValue = 0;
    calData.maxValue = 1023;
    calData.scaleFactor = 1.0;
    calData.offset = 0;
    calData.isCalibrated = false;
    
    EEPROM.put(0, calData);
}

int applyCalibration(int rawValue) {
    if(!calData.isCalibrated) return rawValue;
    
    int calibrated = (rawValue - calData.offset) * calData.scaleFactor;
    return constrain(calibrated, 0, 1023);
}

void waitForButton() {
    while(digitalRead(BTN_CALIBRATE) == HIGH && digitalRead(BTN_RESET_CAL) == HIGH) {
        delay(50);
    }
    delay(300); // Защита от дребезга
}