// Zeit-bezogene Variablen und Includes
#pragma once
#include <Arduino.h>
#include <ESPAsyncWebServer.h>
#include <ArduinoJson.h>
#include <time.h>
#include <sys/time.h>

// Globale Zeitvariablen
struct timeval tv;
struct timezone tz;
time_t now;
struct tm timeinfo;

void setupTimeAPI(AsyncWebServer& server);
String getCurrentTimeJSON();
bool setSystemTime(long timestamp);

// Hilfsfunktionen für Zeit-Management
String getCurrentTimeJSON() {
  gettimeofday(&tv, &tz);
  now = tv.tv_sec;
  
  StaticJsonDocument<200> doc;
  doc["timestamp"] = (long)now;
  doc["success"] = true;
  
  // Zusätzliche Zeitinformationen
  gmtime_r(&now, &timeinfo);
  char timeStr[64];
  strftime(timeStr, sizeof(timeStr), "%Y-%m-%d %H:%M:%S", &timeinfo);
  doc["formatted"] = String(timeStr);
  doc["year"] = timeinfo.tm_year + 1900;
  doc["month"] = timeinfo.tm_mon + 1;
  doc["day"] = timeinfo.tm_mday;
  doc["hour"] = timeinfo.tm_hour;
  doc["minute"] = timeinfo.tm_min;
  doc["second"] = timeinfo.tm_sec;
  
  String response;
  serializeJson(doc, response);
  return response;
}

bool setSystemTime(long timestamp) {
  struct timeval tv;
  tv.tv_sec = timestamp;
  tv.tv_usec = 0;
  
  if (settimeofday(&tv, NULL) == 0) {
    Serial.println("Zeit erfolgreich gesetzt: " + String(timestamp));
    return true;
  } else {
    Serial.println("Fehler beim Setzen der Zeit");
    return false;
  }
}

void setupTimeAPI(AsyncWebServer& server) {

// API-Endpunkt: Aktuelle Zeit abrufen
server.on("/api/time", HTTP_GET, [](AsyncWebServerRequest *request){
  String response = getCurrentTimeJSON();
  request->send(200, "application/json", response);
});

// API-Endpunkt: Zeit setzen
server.on("/api/set-time", HTTP_POST, [](AsyncWebServerRequest *request){
  StaticJsonDocument<100> doc;
  
  if (request->hasParam("timestamp", true)) {
    String timestampStr = request->getParam("timestamp", true)->value();
    long timestamp = timestampStr.toInt();
    
    if (timestamp > 0) {
      bool success = setSystemTime(timestamp);
      
      doc["success"] = success;
      if (success) {
        doc["message"] = "Zeit erfolgreich gesetzt";
        doc["timestamp"] = timestamp;
      } else {
        doc["message"] = "Fehler beim Setzen der Zeit";
      }
    } else {
      doc["success"] = false;
      doc["message"] = "Ungültiger Timestamp";
    }
  } else {
    doc["success"] = false;
    doc["message"] = "Timestamp-Parameter fehlt";
  }
  
  String response;
  serializeJson(doc, response);
  request->send(200, "application/json", response);
});

// Alternative Implementierung für manuelle Datum/Zeit-Eingabe
server.on("/api/set-datetime", HTTP_POST, [](AsyncWebServerRequest *request){
  StaticJsonDocument<150> doc;
  
  if (request->hasParam("year", true) && 
      request->hasParam("month", true) && 
      request->hasParam("day", true) &&
      request->hasParam("hour", true) && 
      request->hasParam("minute", true) && 
      request->hasParam("second", true)) {
    
    struct tm timeinfo;
    timeinfo.tm_year = request->getParam("year", true)->value().toInt() - 1900;
    timeinfo.tm_mon = request->getParam("month", true)->value().toInt() - 1;
    timeinfo.tm_mday = request->getParam("day", true)->value().toInt();
    timeinfo.tm_hour = request->getParam("hour", true)->value().toInt();
    timeinfo.tm_min = request->getParam("minute", true)->value().toInt();
    timeinfo.tm_sec = request->getParam("second", true)->value().toInt();
    
    time_t timestamp = mktime(&timeinfo);
    
    if (timestamp != -1) {
      bool success = setSystemTime(timestamp);
      
      doc["success"] = success;
      if (success) {
        doc["message"] = "Zeit erfolgreich gesetzt";
        doc["timestamp"] = (long)timestamp;
      } else {
        doc["message"] = "Fehler beim Setzen der Zeit";
      }
    } else {
      doc["success"] = false;
      doc["message"] = "Ungültiges Datum/Zeit";
    }
  } else {
    doc["success"] = false;
    doc["message"] = "Datum/Zeit-Parameter fehlen";
  }
  
  String response;
  serializeJson(doc, response);
  request->send(200, "application/json", response);
});

// Erweiterte Zeit-Informationen (optional)
server.on("/api/time/info", HTTP_GET, [](AsyncWebServerRequest *request){
  gettimeofday(&tv, &tz);
  now = tv.tv_sec;
  gmtime_r(&now, &timeinfo);
  
  StaticJsonDocument<400> doc;
  doc["timestamp"] = (long)now;
  doc["uptime"] = millis();
  
  // Formatierte Zeitstrings
  char buffer[64];
  strftime(buffer, sizeof(buffer), "%Y-%m-%d", &timeinfo);
  doc["date"] = String(buffer);
  
  strftime(buffer, sizeof(buffer), "%H:%M:%S", &timeinfo);
  doc["time"] = String(buffer);
  
  strftime(buffer, sizeof(buffer), "%A", &timeinfo);
  doc["weekday"] = String(buffer);
  
  strftime(buffer, sizeof(buffer), "%B", &timeinfo);
  doc["month_name"] = String(buffer);
  
  // Zusätzliche Infos
  doc["day_of_year"] = timeinfo.tm_yday + 1;
  doc["week_of_year"] = (timeinfo.tm_yday + 7 - timeinfo.tm_wday) / 7;
  doc["is_dst"] = timeinfo.tm_isdst;
  
  String response;
  serializeJson(doc, response);
  request->send(200, "application/json", response);
});
Serial.println("Zeit-API initialisiert");
}

// Hilfsfunktion: Zeit-Validierung
bool isValidDateTime(int year, int month, int day, int hour, int minute, int second) {
  if (year < 2020 || year > 2099) return false;
  if (month < 1 || month > 12) return false;
  if (day < 1 || day > 31) return false;
  if (hour < 0 || hour > 23) return false;
  if (minute < 0 || minute > 59) return false;
  if (second < 0 || second > 59) return false;
  
  // Erweiterte Validierung für Monatstage
  int daysInMonth[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
  
  // Schaltjahr-Prüfung
  if (month == 2 && ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))) {
    daysInMonth[1] = 29;
  }
  
  return day <= daysInMonth[month - 1];
}

uint64_t getCurrentTimestampMs() {
    struct timeval tv;
    gettimeofday(&tv, NULL);
    return (uint64_t)tv.tv_sec * 1000LL + (uint64_t)tv.tv_usec / 1000LL;
}