Act As Expert Embedded C Software Engineer Speci

#include <Arduino.h>
#include "config.h"
#include "power_manager.h"
#include "wifi_portal.h"
#include "api_client.h"
#include "display_ui.h"


// Forward declarations
static bool pressedEdge(int pin, bool& previous);
static void renderCurrentPage();
static void enterPortal(const String& reason);

PowerManager powerManager;
WiFiPortal portal;
ApiClient api;
DisplayUi ui;
BrewStats latestBrew;

bool activeMode = false;
bool diagnosticsPage = false;
bool lastConfirm = HIGH;
bool lastUp = HIGH;
bool lastDown = HIGH;

static bool pressedEdge(int pin, bool& previous) {
  const bool now = digitalRead(pin);
  const bool pressed = previous == HIGH && now == LOW;
  previous = now;
  if (pressed) delay(25);
  return pressed && digitalRead(pin) == LOW;
}

static void renderCurrentPage() {
  if (diagnosticsPage) {
    ui.showDiagnostics(portal.connectedSsid(), portal.localIp(), portal.rssi(), portal.settings().apiUrl);
  } else {
    ui.showDashboard(latestBrew);
  }
}

static void enterPortal(const String& reason) {
  portal.startPortal(reason);
  ui.showPortal(reason);
  activeMode = true;
}

void setup() {
  Serial.begin(115200);
  pinMode(Config::NAV_CONFIRM, INPUT_PULLUP);
  pinMode(Config::NAV_UP, INPUT_PULLUP);
  pinMode(Config::NAV_DOWN, INPUT_PULLUP);
  powerManager.begin();
  ui.begin();
  portal.begin();

  if (!portal.settings().configured()) {
    enterPortal("Wi-Fi and BeanVault settings are missing.");
    return;
  }
  ui.showMessage("BeanVault", "Connecting to Wi-Fi...");
  if (!portal.connect()) {
    enterPortal("Wi-Fi connection failed.");
    return;
  }

  String error;
  if (!api.fetch(portal.settings().apiUrl, portal.settings().apiToken, latestBrew, error)) {
    enterPortal("BeanVault request failed: " + error);
    return;
  }

  ui.showDashboard(latestBrew);
  activeMode = powerManager.wokeFromButton();
  if (activeMode) {
    powerManager.beginActiveWindow();
  } else {
    powerManager.sleepNow();
  }
}

void loop() {
  if (portal.portalRunning()) {
    portal.handle();
    return;
  }
  if (!activeMode) return;

  const bool pagePress = pressedEdge(Config::NAV_CONFIRM, lastConfirm) ||
                         pressedEdge(Config::NAV_UP, lastUp) ||
                         pressedEdge(Config::NAV_DOWN, lastDown);
  if (pagePress) {
    diagnosticsPage = !diagnosticsPage;
    renderCurrentPage();
  }
  if (powerManager.activeWindowExpired()) powerManager.sleepNow();
  delay(20);
}