#define BLYNK_TEMPLATE_ID "TMPL6LceqZT8g"
#define BLYNK_TEMPLATE_NAME "Esp32 Test"
#define BLYNK_AUTH_TOKEN "B0HDGole9rry6Q3RZPk1WlrBFNtfedV4"

#include <WiFi.h>
#include <WebServer.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <RTClib.h>
#include <Preferences.h>

// ================= HARDWARE PIN =================
#define RELAY_STARTER 25
#define RELAY_KONTAK  26
#define RELAY_SOLENOID 27
#define PIN_VOLT 34

const int ledPin = 2;

// ================= ADC CONFIG =================
#define ADC_MAX 4095
#define VREF 3.3
#define R1 100000.0   // resistor atas (ohm)
#define R2 10000.0    // resistor bawah (ohm)

// ================= OBJECT =================
RTC_DS3231 rtc;
LiquidCrystal_I2C lcd(0x27, 16, 2);
Preferences prefs;
BlynkTimer timer;
WebServer server(80);

// ================= VARIABEL =================
char ssid_ap[] = "MesinAP";
char pass_ap[] = "mesin123"; // ubah sesuai kebutuhan

String wifiStationSSID = "Wokwi-GUEST";
String wifiStationPASS = "";

bool modeAuto = true;
bool mesinOn = false;
unsigned long startTime = 0;

// ================== JADWAL ==================
const int MAX_JADWAL = 8; // fleksibel
int jumlahJadwal  = 5;                 // jumlah jadwal aktif (default)
int jadwalJam[MAX_JADWAL]   = {7, 11, 14, 18, 21, 0,0,0};
int jadwalMenit[MAX_JADWAL] = {30, 0, 30, 0, 30, 0,0,0};
int durasiMenit   = 30;                // lama mesin ON (menit)


// ================= SENSOR TEGANGAN =================
float bacaTegangan() {
  int adcVal = analogRead(PIN_VOLT);
  float v = (adcVal * VREF / ADC_MAX);   // tegangan ADC
  float vin = v * (R1 + R2) / R2;        // tegangan real aki
  return vin;
}

// ================= ANTI STARTER =================
bool mesinHidup() {
  float total = 0;
  for (int i=0; i<10; i++) { // ambil rata-rata 10x
    total += bacaTegangan();
    delay(5);
  }
  float v = total / 10.0;
  return (v > 13.0);  // anggap mesin hidup jika >13V
}

// ================= FUNGSI MESIN =================
void startMesin() {
  if (mesinHidup()) {
    Serial.println("Mesin sudah hidup, cegah starter!");
    return;
  }

  Serial.println("Menyalakan mesin...");
  digitalWrite(ledPin, HIGH);

  // Hidupkan kontak & solenoid
  digitalWrite(RELAY_KONTAK, HIGH);
  delay(500);
  digitalWrite(RELAY_SOLENOID, HIGH);
  delay(500);

  int retry = 0;
  while (!mesinHidup() && retry < 3) {
    Serial.printf("Percobaan starter ke-%d...\n", retry+1);

    digitalWrite(RELAY_STARTER, HIGH);
    delay(2000);  // putar starter 2 detik
    digitalWrite(RELAY_STARTER, LOW);

    delay(1000);  // tunggu sebentar cek RPM lagi
    retry++;
  }

  if (mesinHidup()) {
    Serial.println("Mesin berhasil hidup!");
    mesinOn = true;
    startTime = millis();
    Blynk.virtualWrite(V4, "ON");
  } else {
    Serial.println("Gagal menyalakan mesin setelah 3 percobaan!");
    stopMesin(); // pastikan mati
  }
}


void stopMesin() {
  Serial.println("Mematikan mesin...");
  digitalWrite(RELAY_STARTER, LOW);
  digitalWrite(RELAY_SOLENOID, LOW);
  digitalWrite(RELAY_KONTAK, LOW);
  digitalWrite(ledPin, LOW);
  mesinOn = false;
  Blynk.virtualWrite(V4, "OFF");
  Blynk.virtualWrite(V0, 0);
}

// ================= CEK JADWAL =================
void cekJadwal() {
  DateTime now = rtc.now();

  // cek apakah cocok dengan salah satu jadwal (toleransi 5 detik)
  for (int i = 0; i < jumlahJadwal; i++) {
    if (jadwalJam[i] < 0) continue;
    if (now.hour() == jadwalJam[i] && now.minute() == jadwalMenit[i] && now.second() < 5) {
      if (!mesinOn) {
        startMesin();
      }
    }
  }

  // cek durasi
  if (mesinOn && (millis() - startTime > (unsigned long)durasiMenit * 60000UL)) {
    stopMesin();
  }
}

// ================= BLYNK HANDLER =================
BLYNK_WRITE(V0) {  // Start manual
  if (param.asInt() == 1) startMesin();
  else stopMesin();
}

BLYNK_WRITE(V2) {  // Kontak ON/OFF manual
  digitalWrite(RELAY_KONTAK, param.asInt() ? HIGH : LOW);
}
BLYNK_WRITE(V3) {  // Mode Auto/Manual
  modeAuto = param.asInt();
  prefs.putBool("modeAuto", modeAuto);
  Blynk.virtualWrite(V5, modeAuto ? "AUTO" : "MANUAL");
  Blynk.virtualWrite(V3, modeAuto ? 1 : 0);
}

BLYNK_CONNECTED() {
  Blynk.syncAll();
  Blynk.virtualWrite(V4, mesinOn ? "ON" : "OFF");
  Blynk.virtualWrite(V5, modeAuto ? "AUTO" : "MANUAL");
}

// ================= WEB UI =================

String html_escape(const String &input) {
  String output = input;
  output.replace("&", "&amp;");
  output.replace("<", "&lt;");
  output.replace(">", "&gt;");
  output.replace("\"", "&quot;");
  output.replace("'", "&#39;");
  return output;
}
// ================== Web UI ==================
String pageRoot(){
  String s = "<!doctype html><html><head><meta charset='utf-8'>";
  s += "<meta name='viewport' content='width=device-width,initial-scale=1'>";
  s += "<title>ESP32 Mesin</title>";
  s += "<style>";
  s += "body{font-family:Arial,Helvetica,sans-serif;margin:0;padding:0;background:#f7f7f7;color:#333;}";
  s += "header{background:#1976d2;color:white;padding:12px;text-align:center;font-size:1.2em;}";
  s += ".container{max-width:700px;margin:20px auto;padding:10px;}";
  s += ".card{background:white;border-radius:10px;box-shadow:0 2px 6px rgba(0,0,0,0.1);padding:15px;margin-bottom:15px;}";
  s += "h2,h3,h4{margin-top:0;color:#1976d2;}";
  s += "label{display:block;margin-top:8px;font-size:0.9em;}";
  s += "input,select,button{padding:8px;margin-top:5px;width:100%;box-sizing:border-box;border-radius:6px;border:1px solid #ccc;}";
  s += "button{background:#1976d2;color:white;border:none;cursor:pointer;transition:0.2s;}";
  s += "button:hover{background:#125a9c;}";
  s += ".btn-danger{background:#d32f2f;}";
  s += ".btn-danger:hover{background:#a31616;}";
  s += ".status{font-weight:bold;}";
  s += "</style></head><body>";

  s += "<header>ESP32 Mesin Control</header>";
  s += "<div class='container'>";

  // status (pakai id agar bisa diupdate JS)
  s += "<div class='card'><h3>Status</h3>";
  s += "<p>Mesin: <span id='mesinStatus' class='status'>" + String(mesinOn ? "ON" : "OFF") + "</span></p>";
  s += "<p>Mode: <span id='modeStatus' class='status'>" + String(modeAuto ? "AUTO" : "MANUAL") + "</span></p></div>";

  // kontrol manual
  s += "<div class='card'><h3>Kontrol Manual</h3>";
  s += "<form action='/action' method='get'>";
  s += "<button name='cmd' value='start'>▶ Start Sekarang</button>";
  s += "<button class='btn-danger' name='cmd' value='stop'>■ Stop Sekarang</button>";
  s += "</form></div>";

  // mode
  s += "<div class='card'><h3>Mode Operasi</h3>";
  s += "<form action='/action' method='get'>Mode: ";
  s += "<select name='mode'><option value='1' " + String(modeAuto?"selected":"") + ">AUTO</option>";
  s += "<option value='0' " + String(!modeAuto?"selected":"") + ">MANUAL</option></select>";
  s += "<button type='submit'>Simpan</button></form></div>";

  // durasi
  s += "<div class='card'><h3>Durasi Mesin</h3>";
  s += "<form action='/durasi' method='get'>Durasi (menit):";
  s += "<input name='d' type='number' min='1' max='1440' value='" + String(durasiMenit) + "'>";
  s += "<button type='submit'>Simpan</button></form></div>";

  // jadwal
  s += "<div class='card'><h3>Jadwal (max " + String(MAX_JADWAL) + ")</h3>";
  s += "<form action='/jadwal' method='get'>";
  for (int i=0;i<MAX_JADWAL;i++){
    String jamStr = (jadwalJam[i] >= 0 && jadwalMenit[i] >= 0) 
                  ? String(jadwalJam[i]) + ":" + (jadwalMenit[i]<10?"0":"") + String(jadwalMenit[i]) 
                  : "";
    s += "<label>Jadwal " + String(i+1) + ": <input name='jt" + String(i) + "' type='time' value='" + jamStr + "'></label>";
  }
  s += "<button type='submit'>Simpan Jadwal</button></form></div>";

  // wifi
  s += "<div class='card'><h3>WiFi Rumah</h3>";
  s += "<form action='/wifi' method='get'>SSID:<input name='s' value='" + html_escape(wifiStationSSID) + "'>";
  s += "Password:<input name='p' type='password' value='" + html_escape(wifiStationPASS) + "'>";
  s += "<button type='submit'>Simpan & Connect</button></form>";
  s += "<p style='font-size:0.85em;color:#666'>Hotspot aktif: <b>" + String(ssid_ap) + "</b> (pwd " + String(pass_ap) + ")</p></div>";

  float v = bacaTegangan();
  s += "<div class='card'><h3>Status Tegangan</h3>";
  s += "<p>Tegangan terukur: <b><span id='teganganStatus'>" + String(v,2) + "</span> V</b></p></div>";

  s += "</div></body></html>";
  return s;
}

void handleRoot(){ server.send(200, "text/html", pageRoot()); }

void handleStatus(){
  float v = bacaTegangan();
  String json = "{";
  json += "\"mesin\":" + String(mesinOn ? "true" : "false");
  json += ",\"mode\":" + String(modeAuto ? "true" : "false");
  json += ",\"tegangan\":" + String(v,2);
  json += "}";
  server.send(200, "application/json", json);
}


void handleSave(){
  if (server.method() != HTTP_POST) { server.send(405); return; }

  String mode = server.arg("mode");
  String dur = server.arg("durasi");
  if (mode.length()){
    modeAuto = (mode=="1");
    prefs.putBool("modeAuto", modeAuto);
  }
  if (dur.length()){
    durasiMenit = dur.toInt();
    prefs.putInt("durasiMenit", durasiMenit);
  }

  // baca jadwal
  for (int i=0;i<MAX_JADWAL;i++){
    String sj = server.arg("jam"+String(i));
    String sm = server.arg("menit"+String(i));
    int jj = sj.length()?sj.toInt():-1;
    int mm = sm.length()?sm.toInt():-1;
    if (jj>=0 && mm>=0){
      jadwalJam[i] = jj;
      jadwalMenit[i] = mm;
      prefs.putInt((String("jadwalJam")+i).c_str(), jadwalJam[i]);
      prefs.putInt((String("jadwalMenit")+i).c_str(), jadwalMenit[i]);
    } else {
      jadwalJam[i] = -1; jadwalMenit[i] = -1;
      prefs.putInt((String("jadwalJam")+i).c_str(), -1);
      prefs.putInt((String("jadwalMenit")+i).c_str(), -1);
    }
  }
  prefs.putInt("jumlahJadwal", jumlahJadwal);

  server.sendHeader("Location", "/");
  server.send(303);
}

void handleStart(){
  if (server.method() == HTTP_POST) startMesin();
  server.sendHeader("Location", "/");
  server.send(303);
}
void handleStop(){
  if (server.method() == HTTP_POST) stopMesin();
  server.sendHeader("Location", "/");
  server.send(303);
}

void handleWifi(){
  if (server.method() != HTTP_POST) { server.send(405); return; }
  String s = server.arg("ssid");
  String p = server.arg("pass");
  if (s.length()>0){
    wifiStationSSID = s;
    wifiStationPASS = p;
    prefs.putString("wifi_ssid", wifiStationSSID);
    prefs.putString("wifi_pass", wifiStationPASS);

    // coba connect langsung
    WiFi.disconnect();
    WiFi.begin(wifiStationSSID.c_str(), wifiStationPASS.c_str());
    unsigned long start = millis();
    while (millis() - start < 10000){
      if (WiFi.status() == WL_CONNECTED) break;
      delay(200);
    }
  }
  server.sendHeader("Location", "/");
  server.send(303);
}

// ================= SETUP =================
void setup() {
  Serial.begin(115200);
  Wire.begin();
  rtc.begin();
  lcd.init(); lcd.backlight();

  prefs.begin("mesin", false);
  modeAuto = prefs.getBool("modeAuto", true);
  durasiMenit = prefs.getInt("durasiMenit", 30);
  jumlahJadwal = prefs.getInt("jumlahJadwal", 5);

  // load jadwal dari NVS jika ada
  for (int i=0;i<MAX_JADWAL;i++){
    jadwalJam[i] = prefs.getInt((String("jadwalJam")+i).c_str(), jadwalJam[i]);
    jadwalMenit[i] = prefs.getInt((String("jadwalMenit")+i).c_str(), jadwalMenit[i]);
  }

  wifiStationSSID = prefs.getString("wifi_ssid", "");
  wifiStationPASS = prefs.getString("wifi_pass", "");

  pinMode(RELAY_STARTER, OUTPUT);
  pinMode(RELAY_KONTAK, OUTPUT);
  pinMode(RELAY_SOLENOID, OUTPUT);
  pinMode(ledPin, OUTPUT);

  stopMesin();

  // Coba konek ke WiFi rumah dulu, jika gagal buka AP
  if (wifiStationSSID.length()>0){
    Serial.println("Mencoba konek ke WiFi saved...");
    WiFi.begin(wifiStationSSID.c_str(), wifiStationPASS.c_str());
    unsigned long start = millis();
    while (millis() - start < 8000){
      if (WiFi.status() == WL_CONNECTED) break;
      delay(200);
    }
  }
  if (WiFi.status() == WL_CONNECTED){
    Serial.println("Terhubung ke WiFi rumah: "+WiFi.SSID());
    Serial.print("IP: "); Serial.println(WiFi.localIP());
  } else {
    Serial.println("Tidak terhubung ke WiFi. Membuat Access Point...");
    WiFi.softAP(ssid_ap, pass_ap);
    IPAddress ip = WiFi.softAPIP();
    Serial.print("AP IP: "); Serial.println(ip);
  }

  // Init Blynk (tetap pakai Blynk, jika perangkat online)
  if (WiFi.status() == WL_CONNECTED) Blynk.begin(BLYNK_AUTH_TOKEN, wifiStationSSID.c_str(), wifiStationPASS.c_str());

  // setup web server routes
  server.on("/status", handleStatus);
  server.on("/", HTTP_GET, handleRoot);
  server.on("/save", HTTP_POST, handleSave);
  server.on("/start", HTTP_POST, handleStart);
  server.on("/stop", HTTP_POST, handleStop);
  server.on("/wifi", HTTP_POST, handleWifi);
  server.begin();

  // update status LCD & Blynk tiap 1 detik
  timer.setInterval(1000L, []() {
    DateTime now = rtc.now();
    char buf[17];
    snprintf(buf, sizeof(buf), "Jam:%02d:%02d:%02d", now.hour(), now.minute(), now.second());
    lcd.setCursor(0,0); lcd.print(String(buf)+"    ");
    lcd.setCursor(0,1); lcd.print(String("M:" ) + (mesinOn?"ON ":"OFF") + " " + (modeAuto?"AUTO":"MANU") + "   ");

    // Kirim status ke Blynk jika terkoneksi
    if (WiFi.status() == WL_CONNECTED) {
      Blynk.virtualWrite(V4, mesinOn ? "ON" : "OFF");
      Blynk.virtualWrite(V5, modeAuto ? "AUTO" : "MANUAL");
    }
  });
}

// ================= LOOP =================
void loop() {
  if (WiFi.status() == WL_CONNECTED) {
    Blynk.run();
  }
  timer.run();
  server.handleClient();

  if (modeAuto) {
    cekJadwal();  // cek apakah waktunya nyala / mati
  }
}