#include <Wire.h>
#include <PCF8575.h>
#include <Adafruit_NeoPixel.h>
#include <ESP8266WebServer.h>
#include <ArduinoOTA.h>
#include <LittleFS.h>
#include "Config.ino"
#include <DNSServer.h>
#include <ArduinoJson.h>

// Globale Deklarationen für alle Tabs
ESP8266WebServer server(80);
const byte DNS_PORT = 53;
DNSServer dnsServer;

String sketchName() {           // Dateiname für den Admin Tab ab EspCoreVersion 2.6.0
  char file[sizeof(__FILE__)] = __FILE__;
  char * pos = strrchr(file, '.'); *pos = '\0';
  return file;
}

#define AMOUNTOFPORTS 16 // currently max 16 ports are supported
#define EXPANDER1ADDRESS 0x21 // address of expander 1

struct PortConfig {
  String name;
  bool enabled;
};

PCF8575 expander1(EXPANDER1ADDRESS);
uint8_t portStates[AMOUNTOFPORTS];
uint8_t lastStates[AMOUNTOFPORTS] = {0};
PortConfig portConfigs[AMOUNTOFPORTS];
byte number=0;

extern Adafruit_NeoPixel* pixels;

void loadPortConfig() {
  File file = LittleFS.open("/portconfig.json", "r");
  if (file) {
    DynamicJsonDocument doc(1024);
    DeserializationError error = deserializeJson(doc, file);
    file.close();
    if (!error) {
      JsonArray ports = doc["ports"];
      for (size_t i = 0; i < AMOUNTOFPORTS && i < ports.size(); i++) {
        portConfigs[i].name = ports[i]["name"] | ("Port " + String(i));
        portConfigs[i].enabled = ports[i]["enabled"] | true;
      }
    } else {
      // Default
      for (int i = 0; i < AMOUNTOFPORTS; i++) {
        portConfigs[i].name = "Port " + String(i);
        portConfigs[i].enabled = true;
      }
    }
  } else {
    // Default all enabled
    for (int i = 0; i < AMOUNTOFPORTS; i++) {
      portConfigs[i].name = "Port " + String(i);
      portConfigs[i].enabled = true;
    }
  }
}

void savePortConfig() {
  DynamicJsonDocument doc(1024);
  JsonArray ports = doc.createNestedArray("ports");
  for (int i = 0; i < AMOUNTOFPORTS; i++) {
    JsonObject port = ports.createNestedObject();
    port["name"] = portConfigs[i].name;
    port["enabled"] = portConfigs[i].enabled;
  }
  File file = LittleFS.open("/portconfig.json", "w");
  if (file) {
    serializeJson(doc, file);
    file.close();
  }
}

void setup() {
  Serial.begin(SERIAL_SPEED);
  delay(100);
  Serial.printf("\nSketchname: %s\nBuild: %s\t\tIDE: %d.%d.%d\n%s\n\n",
                (__FILE__), (__TIMESTAMP__), ARDUINO / 10000, ARDUINO % 10000 / 100, ARDUINO % 100 / 10 ? ARDUINO % 100 : ARDUINO % 10, ESP.getFullVersion().c_str());
  
  Serial.printf("\nKeyPatch ESP8266 WebServer\n");
  //Set UP 12C Communication
  Wire.begin();
  for (byte adress=8; adress<120; adress++)
  {
    Wire.beginTransmission(adress);
    if (Wire.endTransmission()==0)
    {
      Serial.print(number+1);
      Serial.print(". Device: 0x");
      Serial.println(adress, HEX);
      number++;
    }
  }
  Serial.print (number, DEC);
  Serial.println (" device(s) found.");
  //Setup CPF Expander
  
  Serial.print("Expander 1 at ");
    Serial.print(EXPANDER1ADDRESS,HEX);
  if (!expander1.begin())
  {
    Serial.println(" could not initialize...");
  }
  if (!expander1.isConnected())
  {
    Serial.println(" => not connected");
  }
  else
  {
    Serial.println(" => connected!!");
  }
    
  //Setup NeoPixel
  NeoPixel_init(AMOUNTOFPORTS); // Initialisierung der NeoPixel
    for (uint8_t i = 0; i < AMOUNTOFPORTS; i++) {
      portStates[i] = 0;
  lastStates[i] = 0;
  pixels->setPixelColor(i, pixels->Color(0, 0, 0)); // aus
  };
  pixels->show();

// SetUp WebServer
 setupFS();                    // setupFS(); oder spiffs(); je nach Dateisystem
  loadPortConfig();            // Lade Port-Konfiguration
  connectWifi();
  admin();
   ArduinoOTA.onStart([]() {
    //save();                   // Wenn Werte vor dem Neustart gespeichert werden sollen
  });
  ArduinoOTA.begin();
  server.begin();

  // Handler für Port-Konfiguration
  server.on("/portconfig", HTTP_GET, []() {
    File file = LittleFS.open("/html/portconfig.html", "r");
    if (file) {
      server.streamFile(file, "text/html");
      file.close();
    } else {
      server.send(404, "text/plain", "File not found");
    }
  });

  server.on("/portconfig/data", HTTP_GET, []() {
    DynamicJsonDocument doc(1024);
    JsonArray ports = doc.createNestedArray("ports");
    for (int i = 0; i < AMOUNTOFPORTS; i++) {
      JsonObject port = ports.createNestedObject();
      port["name"] = portConfigs[i].name;
      port["enabled"] = portConfigs[i].enabled;
    }
    String json;
    serializeJson(doc, json);
    server.send(200, "application/json", json);
  });

  server.on("/portconfig", HTTP_POST, []() {
    DynamicJsonDocument doc(1024);
    DeserializationError error = deserializeJson(doc, server.arg("plain"));
    if (!error) {
      JsonArray ports = doc["ports"];
      for (size_t i = 0; i < AMOUNTOFPORTS && i < ports.size(); i++) {
        portConfigs[i].name = ports[i]["name"] | ("Port " + String(i));
        portConfigs[i].enabled = ports[i]["enabled"] | true;
      }
      savePortConfig();
    }
    server.sendHeader("Location", "/portconfig");
    server.send(303);
  });

  // Handler für Startseite
  server.on("/", HTTP_GET, []() {
    File file = LittleFS.open("/index.html", "r");
    if (file) {
      server.streamFile(file, "text/html");
      file.close();
    } else {
      server.send(404, "text/plain", "File not found");
    }
  });

  // Handler für Status-Daten
  server.on("/status/data", HTTP_GET, []() {
    DynamicJsonDocument doc(1024);
    JsonArray ports = doc.createNestedArray("ports");
    for (int i = 0; i < AMOUNTOFPORTS; i++) {
      JsonObject port = ports.createNestedObject();
      port["name"] = portConfigs[i].name;
      port["enabled"] = portConfigs[i].enabled;
      port["state"] = portStates[i];
    }
    String json;
    serializeJson(doc, json);
    server.send(200, "application/json", json);
  });

  Serial.println("Setup End...");
}

void loop() {
  ArduinoOTA.handle();
  server.handleClient();
  if (millis() < 0x2FFF || millis() > 0xFFFFF0FF) {    // Die Funktion "runtime()" wird nur für den Admin Tab gebraucht.
    runtime();                                         // Auskommentieren falls du den Admin Tab nicht nutzen möchtest.
  }
  dnsServer.processNextRequest();
  reStation();
  // Erst 16 Ports aus PCF8575 einlesen
  for (uint8_t i = 0; i < AMOUNTOFPORTS; i++) {
    portStates[i] = expander1.read(i);
  }
  
  for (uint8_t i = 0; i < AMOUNTOFPORTS; i++) {
    if (portStates[i] != lastStates[i]) {
      // Ausgabe: geänderte Ports melden
      Serial.print("Pin ");
      Serial.print(i);
      Serial.print(" hat sich geändert -> ");
      Serial.println(portStates[i]);
      lastStates[i] = portStates[i];
    }
    // LED aktualisieren
    if (portConfigs[i].enabled) {
      if (portStates[i] == 0) {
        pixels->setPixelColor(i, pixels->Color(0, 150, 0)); // grün
      } else {
        bool globalBlinkState = (millis() / BLINK_INTERVAL) % 2;
        if (globalBlinkState) {
          pixels->setPixelColor(i, pixels->Color(150, 0, 0)); // rot
        } else {
          pixels->setPixelColor(i, pixels->Color(0, 0, 0)); // aus
        }
      }
    } else {
      pixels->setPixelColor(i, pixels->Color(0, 0, 0)); // aus
    }
  }
  pixels->show();
  delay(50);
}