// ============== ESP32 VERSION (no buttons) ===================
// Reads moisture from potentiometer on GPIO34
// Displays moisture % and plant image on SSD1306 OLED

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
#define SCREEN_ADDRESS 0x3C

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define SOIL_PIN 34   // analog input from potentiometer

// Default hard-coded calibration
int dryValue = 4095;   // max ADC — driest
int wetValue = 800;    // in practice adjust if needed

// Plant bitmap dimensions
#define plant_width 32
#define plant_height 48
#include "plant_bitmaps.h"

void setup() {
  Serial.begin(115200);
  
  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println("SSD1306 allocation failed");
    while (true);
  }

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println("Soil Monitor");
  display.println("ESP32 Ready");
  display.display();
  delay(1000);
}

void loop() {
  int soilValue = analogRead(SOIL_PIN); // 0–4095

  int moisturePercent = map(soilValue, dryValue, wetValue, 0, 100);
  moisturePercent = constrain(moisturePercent, 0, 100);

  int imageIndex = map(moisturePercent, 0, 100, 0, 26);
  imageIndex = constrain(imageIndex, 0, 26);

  display.clearDisplay();

  display.setCursor(0, 0);
  display.setTextSize(1);
  display.println("Soil Monitor");

  display.setCursor(0, 16);
  display.setTextSize(2);
  display.print(moisturePercent);
  display.println("%");

  display.setCursor(0, 40);
  display.setTextSize(1);
  display.print("Raw:");
  display.println(soilValue);

  if (moisturePercent < 30) {
    display.println("DRY");
  } else if (moisturePercent < 60) {
    display.println("OK");
  } else {
    display.println("WET");
  }

  display.drawBitmap(96, 8, plant_images[imageIndex], plant_width, plant_height, SSD1306_WHITE);
  display.display();

  delay(300);
}