from sqlalchemy import create_engine, Column, ForeignKey, Integer, String, Date, Float, DateTime
from sqlalchemy.orm import relationship, sessionmaker
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.pool import NullPool
from sqlalchemy.exc import OperationalError

Base = declarative_base()

# TODO: build license plate into car api construct and rebuild api to fit new data
# Funktion zur Herstellung einer Verbindung zur Datenbank
def db_connect():
    try:
        engine = create_engine("postgresql://example:example@localhost/geotrack", poolclass=NullPool)
        # Überprüfe die Verbindung
        with engine.connect() as connection:
            print("Verbindung zur Datenbank erfolgreich!")
        return engine
    except OperationalError as e:
        print(f"Fehler bei der Verbindung zur Datenbank: {e}")
        return None

# Funktion zur Erstellung der Tabellen
def create_table(engine):
    try:
        if engine is not None:
            Base.metadata.create_all(engine)
            print("Tabellen wurden erfolgreich erstellt!")
        else:
            print("Keine Verbindung zur Datenbank verfügbar.")
    except Exception as e:
        print(f"Fehler bei der Tabellenerstellung: {e}")

class Track(Base):
    __tablename__ = 'track'
    id = Column(Integer, primary_key=True, autoincrement=True)
    trackName = Column(String(200), nullable=True)
    vehicle_id = Column(Integer, ForeignKey('vehicle.id'), nullable=False, default=1)
    driver_id = Column(Integer, ForeignKey('driver.id'), nullable=False, default=1)
    date = Column(Date, nullable=True)
    distance = Column(Float, nullable=False, default=0)
    speed = Column(Float, nullable=False, default=0)
    
    driver = relationship("Driver", backref="vehicle_tracks")  # 'vehicle_tracks' als backref
    vehicle = relationship("Vehicle", backref="driver_tracks")  # 'driver_tracks' als backref
    waypoints = relationship('Waypoint', backref='track', lazy=True)

class Waypoint(Base):
    __tablename__ = 'waypoint'
    id = Column(Integer, primary_key=True, autoincrement=True)
    lat = Column(Float, nullable=False)
    lon = Column(Float, nullable=False)
    ele = Column(Float, nullable=False)
    speed = Column(Float, nullable=True)
    time = Column(DateTime, nullable=True)
    track_id = Column(Integer, ForeignKey('track.id'), nullable=False)

class Driver(Base):
    __tablename__ = 'driver'

    id = Column(Integer, primary_key=True)
    name = Column(String, nullable=False)
    tracks = relationship("Track", back_populates="driver")  # Beziehung von Track -> Driver

class Vehicle(Base):
    __tablename__ = 'vehicle'

    id = Column(Integer, primary_key=True)
    name = Column(String, nullable=False)
    tracks = relationship("Track", back_populates="vehicle")  # Beziehung von Track -> Vehicle