#pragma once
#include <Arduino.h>
#include <ArduinoJson.h>
#include <ESPAsyncWebServer.h>
#include <HTTPClient.h>
#include <algorithm>
#include <preferencemanager.h>
#include <vector>

const char *BACKEND_SERVER = "https://ninja.reptilfpv.de";
extern String
    licence; // Declare licence as an external variable defined elsewhere

// Lokale Benutzer-Struktur
struct LocalUser {
  String uid;
  String name;
  unsigned long timestamp; // Zeitstempel der Erstellung
};

// Lokale Benutzer-Speicherung (geht bei Neustart verloren)
std::vector<LocalUser> localUsers;

bool backendOnline() {

  Serial.println(licence);

  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("No WiFi connection.");
    return false;
  }

  HTTPClient http;
  http.begin(String(BACKEND_SERVER) + "/api/v1/private/health");
  http.addHeader("Authorization", String("Bearer ") + licence);

  int httpCode = http.GET();
  bool isOnline = (httpCode == HTTP_CODE_OK);

  if (isOnline) {
    Serial.println("Database server connection successful");
  } else {
    Serial.printf("Database server connection failed, error: %d\n", httpCode);
  }

  http.end();
  return isOnline;
}

struct UserData {
  String uid;
  String firstname;
  String lastname;
  int alter;
  bool exists;
};

// Forward declarations für Leaderboard-Funktionen
void addLocalTime(String uid, String name, unsigned long timeMs);

// Prüft, ob ein Benutzer mit der angegebenen UID in der Datenbank existiert und
// gibt dessen Daten zurück.
UserData checkUser(const String &uid) {

  UserData userData = {"", "", "", 0, false};
  String upperUid = uid;
  upperUid.toUpperCase(); // UID in Großbuchstaben konvertieren

  // Lokale Benutzer durchsuchen
  for (const auto &user : localUsers) {
    String userUpperUid = user.uid;
    userUpperUid.toUpperCase();
    if (userUpperUid == upperUid) {
      userData.uid = user.uid;
      userData.firstname = user.name;
      userData.lastname = ""; // Nicht mehr verwendet
      userData.alter = 0;     // Nicht mehr verwendet
      userData.exists = true;

      Serial.println("Lokaler Benutzer gefunden: " + user.name);
      return userData;
    }
  }

  Serial.println("Benutzer mit UID " + uid +
                 " nicht in lokaler Datenbank gefunden");
  return userData;
}

// Holt alle Standorte aus der Datenbank und gibt sie als JSON-Dokument zurück.
JsonDocument getAllLocations() {
  JsonDocument locations; // Allocate memory for the JSON document

  if (!backendOnline()) {
    Serial.println("No internet connection, cannot fetch locations.");
    return locations; // Return an empty document
  }

  HTTPClient http;
  http.begin(String(BACKEND_SERVER) + "/v1/private/locations");
  http.addHeader("Authorization", String("Bearer ") + licence);

  int httpCode = http.GET();

  if (httpCode == HTTP_CODE_OK) {
    String payload = http.getString();
    DeserializationError error = deserializeJson(locations, payload);

    if (error) {
      Serial.println("Failed to parse locations JSON.");
    }
  } else {
    Serial.printf("Failed to fetch locations, HTTP code: %d\n", httpCode);
  }

  http.end();
  return locations; // Return the populated JSON document
}

// Prüft, ob ein Benutzer mit der angegebenen UID existiert
// (Kompatibilitätsfunktion).
bool userExists(const String &uid) { return checkUser(uid).exists; }

// Fügt einen neuen Benutzer in die Datenbank ein
bool enterUserData(const String &uid, const String &name) {
  String upperUid = uid;
  upperUid.toUpperCase(); // UID in Großbuchstaben konvertieren

  // Prüfen ob Benutzer bereits existiert
  for (const auto &user : localUsers) {
    String userUpperUid = user.uid;
    userUpperUid.toUpperCase();
    if (userUpperUid == upperUid) {
      Serial.println("Benutzer mit UID " + upperUid + " existiert bereits!");
      return false;
    }
  }

  // Neuen Benutzer erstellen
  LocalUser newUser;
  newUser.uid = upperUid; // UID in Großbuchstaben speichern
  newUser.name = name;
  newUser.timestamp = millis();

  // Benutzer zum lokalen Array hinzufügen
  localUsers.push_back(newUser);

  Serial.println("Benutzer lokal gespeichert:");
  Serial.println("UID: " + upperUid);
  Serial.println("Name: " + name);
  Serial.println("Gespeicherte Benutzer: " + String(localUsers.size()));

  return true;
}

// Gibt alle lokalen Benutzer zurück (für Debugging)
String getLocalUsersList() {
  String result = "Lokale Benutzer (" + String(localUsers.size()) + "):\n";

  for (const auto &user : localUsers) {
    result += "- UID: " + user.uid + ", Name: " + user.name +
              ", Erstellt: " + String(user.timestamp) + "\n";
  }

  return result;
}

// Richtet die HTTP-Routen für die Backend-API ein (z.B. Health-Check, User- und
// Location-Abfragen).
void setupBackendRoutes(AsyncWebServer &server) {

  server.on("/api/health", HTTP_GET, [](AsyncWebServerRequest *request) {
    DynamicJsonDocument doc(64);
    doc["status"] = backendOnline() ? "connected" : "disconnected";
    String response;
    serializeJson(doc, response);
    request->send(200, "application/json", response);
  });

  server.on("/api/users", HTTP_GET, [](AsyncWebServerRequest *request) {
    // Lokale Benutzer als JSON zurückgeben
    DynamicJsonDocument doc(2048);
    JsonArray usersArray = doc.createNestedArray("users");

    for (const auto &user : localUsers) {
      JsonObject userObj = usersArray.createNestedObject();
      userObj["uid"] = user.uid;
      userObj["name"] = user.name;
      userObj["timestamp"] = user.timestamp;
    }

    doc["count"] = localUsers.size();

    String response;
    serializeJson(doc, response);
    request->send(200, "application/json", response);
  });

  // Route zum Erstellen eines neuen Benutzers
  server.on(
      "/api/users/insert", HTTP_POST,
      [](AsyncWebServerRequest *request) {
        Serial.println("API: /api/users/insert aufgerufen");
      },
      NULL,
      [](AsyncWebServerRequest *request, uint8_t *data, size_t len,
         size_t index, size_t total) {
        // Diese Funktion wird für den Body aufgerufen
        static String bodyBuffer = "";

        // Daten anhängen
        for (size_t i = 0; i < len; i++) {
          bodyBuffer += (char)data[i];
        }

        // Wenn alle Daten empfangen wurden
        if (index + len == total) {
          Serial.println("Request Body empfangen: '" + bodyBuffer + "'");

          if (bodyBuffer.length() == 0) {
            Serial.println("FEHLER: Request Body ist leer!");
            DynamicJsonDocument response(200);
            response["success"] = false;
            response["error"] = "Request Body ist leer";
            String jsonString;
            serializeJson(response, jsonString);
            request->send(400, "application/json", jsonString);
            bodyBuffer = "";
            return;
          }

          DynamicJsonDocument doc(512);
          DeserializationError error = deserializeJson(doc, bodyBuffer);

          if (error) {
            Serial.println("JSON Parse Error: " + String(error.c_str()));
            DynamicJsonDocument response(200);
            response["success"] = false;
            response["error"] = "Invalid JSON: " + String(error.c_str());
            String jsonString;
            serializeJson(response, jsonString);
            request->send(400, "application/json", jsonString);
            bodyBuffer = "";
            return;
          }

          String uid = doc["uid"].as<String>();
          String name = doc["name"].as<String>();

          Serial.println("Extrahierte UID: " + uid);
          Serial.println("Extrahierter Name: " + name);

          if (uid.length() == 0 || name.length() == 0) {
            DynamicJsonDocument response(200);
            response["success"] = false;
            response["error"] = "UID und Name sind erforderlich";
            String jsonString;
            serializeJson(response, jsonString);
            request->send(400, "application/json", jsonString);
            bodyBuffer = "";
            return;
          }

          // Prüfen ob Benutzer bereits existiert
          bool userExists = false;
          for (const auto &user : localUsers) {
            if (user.uid == uid) {
              userExists = true;
              break;
            }
          }

          if (userExists) {
            DynamicJsonDocument response(200);
            response["success"] = false;
            response["error"] = "Benutzer bereits vorhanden";
            String jsonString;
            serializeJson(response, jsonString);
            request->send(409, "application/json", jsonString);
            bodyBuffer = "";
            return;
          }

          // Neuen Benutzer direkt in das Array einfügen
          LocalUser newUser;
          newUser.uid = uid;
          newUser.name = name;
          newUser.timestamp = millis();

          localUsers.push_back(newUser);

          Serial.println("Benutzer über API eingefügt:");
          Serial.println("UID: " + uid);
          Serial.println("Name: " + name);
          Serial.println("Gespeicherte Benutzer: " + String(localUsers.size()));

          DynamicJsonDocument response(200);
          response["success"] = true;
          response["message"] = "Benutzer erfolgreich erstellt";
          response["uid"] = uid;
          response["name"] = name;

          String jsonString;
          serializeJson(response, jsonString);
          request->send(200, "application/json", jsonString);

          // Buffer zurücksetzen
          bodyBuffer = "";
        }
      });

  // Debug-Route für lokale Benutzer
  server.on("/api/debug/users", HTTP_GET, [](AsyncWebServerRequest *request) {
    String userList = getLocalUsersList();
    request->send(200, "text/plain", userList);
  });

  // Location routes /api/location/
  server.on("/api/location/", HTTP_GET, [](AsyncWebServerRequest *request) {
    String result;
    serializeJson(getAllLocations(), result);
    request->send(200, "application/json", result);
  });

  server.on("/api/set-local-location", HTTP_POST,
            [](AsyncWebServerRequest *request) {
              Serial.println("/api/set-local-location called");
              String locationId;
              if (request->hasParam("locationId", true)) {
                locationId = request->getParam("locationId", true)->value();
              }
              if (locationId.length() > 0) {
                saveLocationIdToPrefs(locationId);
                DynamicJsonDocument doc(64);
                doc["success"] = true;
                String result;
                serializeJson(doc, result);
                request->send(200, "application/json", result);
              } else {
                request->send(400, "application/json", "{\"success\":false}");
              }
            });

  server.on("/api/get-local-location", HTTP_GET,
            [](AsyncWebServerRequest *request) {
              String locationId = getLocationIdFromPrefs();
              DynamicJsonDocument doc(64);
              doc["locationId"] = locationId;
              String result;
              serializeJson(doc, result);
              request->send(200, "application/json", result);

              // Andere Logik wie in getBestLocs
            });

  // Lokales Leaderboard API (für Hauptseite - 6 Einträge)
  server.on("/api/leaderboard", HTTP_GET, [](AsyncWebServerRequest *request) {
    // Sortiere nach Zeit (beste zuerst)
    std::sort(localTimes.begin(), localTimes.end(),
              [](const LocalTime &a, const LocalTime &b) {
                return a.timeMs < b.timeMs;
              });

    DynamicJsonDocument doc(2048);
    JsonArray leaderboard = doc.createNestedArray("leaderboard");

    // Nimm die besten 6
    int count = 0;
    for (const auto &time : localTimes) {
      if (count >= 6)
        break;

      JsonObject entry = leaderboard.createNestedObject();
      entry["rank"] = count + 1;
      entry["name"] = time.name;
      entry["uid"] = time.uid;
      entry["time"] = time.timeMs / 1000.0;

      // Format time inline
      float seconds = time.timeMs / 1000.0;
      int totalSeconds = (int)seconds;
      int minutes = totalSeconds / 60;
      int remainingSeconds = totalSeconds % 60;
      int milliseconds = (int)((seconds - totalSeconds) * 100);

      String timeFormatted;
      if (minutes > 0) {
        timeFormatted = String(minutes) + ":" +
                        (remainingSeconds < 10 ? "0" : "") +
                        String(remainingSeconds) + "." +
                        (milliseconds < 10 ? "0" : "") + String(milliseconds);
      } else {
        timeFormatted = String(remainingSeconds) + "." +
                        (milliseconds < 10 ? "0" : "") + String(milliseconds);
      }
      entry["timeFormatted"] = timeFormatted;

      count++;
    }

    String result;
    serializeJson(doc, result);
    request->send(200, "application/json", result);
  });

  // Erweiterte Leaderboard API (für Leaderboard-Seite - 10 Einträge)
  server.on(
      "/api/leaderboard-full", HTTP_GET, [](AsyncWebServerRequest *request) {
        // Sortiere nach Zeit (beste zuerst)
        std::sort(localTimes.begin(), localTimes.end(),
                  [](const LocalTime &a, const LocalTime &b) {
                    return a.timeMs < b.timeMs;
                  });

        DynamicJsonDocument doc(2048);
        JsonArray leaderboard = doc.createNestedArray("leaderboard");

        // Nimm die besten 10
        int count = 0;
        for (const auto &time : localTimes) {
          if (count >= 10)
            break;

          JsonObject entry = leaderboard.createNestedObject();
          entry["rank"] = count + 1;
          entry["name"] = time.name;
          entry["uid"] = time.uid;
          entry["time"] = time.timeMs / 1000.0;

          // Format time inline
          float seconds = time.timeMs / 1000.0;
          int totalSeconds = (int)seconds;
          int minutes = totalSeconds / 60;
          int remainingSeconds = totalSeconds % 60;
          int milliseconds = (int)((seconds - totalSeconds) * 100);

          String timeFormatted;
          if (minutes > 0) {
            timeFormatted =
                String(minutes) + ":" + (remainingSeconds < 10 ? "0" : "") +
                String(remainingSeconds) + "." +
                (milliseconds < 10 ? "0" : "") + String(milliseconds);
          } else {
            timeFormatted = String(remainingSeconds) + "." +
                            (milliseconds < 10 ? "0" : "") +
                            String(milliseconds);
          }

          entry["timeFormatted"] = timeFormatted;
          count++;
        }

        String result;
        serializeJson(doc, result);
        request->send(200, "application/json", result);
      });

  // Add more routes as needed
}

// Hilfsfunktionen um UID und Status abzufragen (aus communication.h)
String getStart1UID();
String getStart2UID();
bool wasStart1FoundLocally();
bool wasStart2FoundLocally();

// Funktion um Zeit an Online-API zu senden
void sendTimeToOnlineAPI(int lane, String uid, float timeInSeconds) {
  // Nur senden wenn User online gefunden wurde
  bool wasOnlineFound =
      (lane == 1) ? !wasStart1FoundLocally() : !wasStart2FoundLocally();

  if (!wasOnlineFound) {
    Serial.println("Zeit nicht gesendet - User wurde lokal gefunden");
    return;
  }

  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("Keine Internetverbindung - Zeit nicht gesendet");
    return;
  }

  Serial.println("Sende Zeit an Online-API für Lane " + String(lane));

  HTTPClient http;
  http.begin(String(BACKEND_SERVER) + "/api/v1/private/create-time");
  http.addHeader("Content-Type", "application/json");
  http.addHeader("Authorization", String("Bearer ") + licence);

  // Zeit in M:SS.mmm Format konvertieren (ohne führende Null bei Minuten)
  int minutes = (int)(timeInSeconds / 60);
  int seconds = (int)timeInSeconds % 60;
  int milliseconds = (int)((timeInSeconds - (int)timeInSeconds) * 1000);

  String formattedTime =
      String(minutes) + ":" + (seconds < 10 ? "0" : "") + String(seconds) +
      "." + (milliseconds < 10 ? "00" : (milliseconds < 100 ? "0" : "")) +
      String(milliseconds);

  StaticJsonDocument<200> requestDoc;
  requestDoc["rfiduid"] = uid;
  requestDoc["location_name"] =
      getLocationIdFromPrefs(); // Aus den Einstellungen
  requestDoc["recorded_time"] = formattedTime;

  String requestBody;
  serializeJson(requestDoc, requestBody);

  Serial.println("API Request Body: " + requestBody);

  int httpCode = http.POST(requestBody);

  if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_CREATED) {
    String response = http.getString();
    Serial.println("Zeit erfolgreich gesendet: " + response);
  } else {
    Serial.printf("Fehler beim Senden der Zeit: HTTP %d\n", httpCode);
    if (httpCode > 0) {
      String response = http.getString();
      Serial.println("Response: " + response);
    }
  }

  http.end();
}

// Funktionen für lokales Leaderboard
void addLocalTime(String uid, String name, unsigned long timeMs) {
  // Prüfe minimale Zeit für Leaderboard-Eintrag
  if (timeMs < minTimeForLeaderboard) {
    Serial.printf(
        "Zeit zu kurz für Leaderboard: %s (%s) - %.2fs (Minimum: %.2fs)\n",
        name.c_str(), uid.c_str(), timeMs / 1000.0,
        minTimeForLeaderboard / 1000.0);
    return; // Zeit wird nicht ins Leaderboard eingetragen
  }

  LocalTime newTime;
  newTime.uid = uid;
  newTime.name = name;
  newTime.timeMs = timeMs;
  newTime.timestamp = millis();

  localTimes.push_back(newTime);

  // Speichere das Leaderboard automatisch
  saveBestTimes();

  Serial.printf("Lokale Zeit hinzugefügt: %s (%s) - %.2fs\n", name.c_str(),
                uid.c_str(), timeMs / 1000.0);
}

// Leert das lokale Leaderboard
void clearLocalLeaderboard() {
  localTimes.clear();
  saveBestTimes(); // Speichere das geleerte Leaderboard
  Serial.println("Lokales Leaderboard geleert");
}