from app.core.extensions import db
import json
from datetime import datetime
import ipaddress
from flask_login import UserMixin
# Import User from auth instead of defining it here
from app.core.auth import User


class Location(db.Model):
    __tablename__ = "locations"

    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(255), nullable=False)
    description = db.Column(db.Text, nullable=True)
    user_id = db.Column(db.Integer, db.ForeignKey("users.id"), nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    # Relationships
    subnets = db.relationship("Subnet", backref="location_ref", lazy=True, cascade="all, delete-orphan")
    standalone_servers = db.relationship(
        "Server", 
        primaryjoin="and_(Server.location_id==Location.id, Server.subnet_id==None)",
        backref="location_ref", 
        lazy=True
    )

    def __repr__(self):
        return f"<Location {self.name}>"


class Subnet(db.Model):
    __tablename__ = "subnets"

    id = db.Column(db.Integer, primary_key=True)
    cidr = db.Column(db.String(45), nullable=False)
    location_id = db.Column(db.Integer, db.ForeignKey("locations.id"), nullable=False)
    user_id = db.Column(db.Integer, db.ForeignKey("users.id"), nullable=False)
    auto_scan = db.Column(db.Boolean, default=False)
    active_hosts = db.Column(db.Text, default='[]')
    last_scanned = db.Column(db.DateTime, nullable=True)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    # Relationships
    servers = db.relationship("Server", backref="subnet", lazy=True)

    def __repr__(self):
        return f"<Subnet {self.cidr}>"

    @property
    def used_ips(self):
        """Number of IPs used in this subnet (servers)"""
        return len(self.servers)

    # Getter and setter for active_hosts as JSON
    @property
    def active_hosts_list(self):
        if not self.active_hosts:
            return []
        return json.loads(self.active_hosts)

    @active_hosts_list.setter
    def active_hosts_list(self, hosts):
        self.active_hosts = json.dumps(hosts)


class Server(db.Model):
    __tablename__ = "servers"

    id = db.Column(db.Integer, primary_key=True)
    hostname = db.Column(db.String(255), nullable=False)
    ip_address = db.Column(db.String(45), nullable=False)
    subnet_id = db.Column(db.Integer, db.ForeignKey("subnets.id"), nullable=True)
    location_id = db.Column(db.Integer, db.ForeignKey("locations.id"), nullable=True)
    user_id = db.Column(db.Integer, db.ForeignKey("users.id"), nullable=False)
    description = db.Column(db.Text, nullable=True)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    # Relationships
    apps = db.relationship("App", back_populates="server", lazy=True, cascade="all, delete-orphan")

    def __repr__(self):
        return f"<Server {self.hostname}>"


class App(db.Model):
    __tablename__ = "apps"

    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(64), nullable=False)
    server_id = db.Column(db.Integer, db.ForeignKey("servers.id"), nullable=False)
    user_id = db.Column(db.Integer, db.ForeignKey("users.id"), nullable=False)
    documentation = db.Column(db.Text, nullable=True)
    url = db.Column(db.String(255), nullable=True)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    # Relationships
    server = db.relationship("Server", back_populates="apps")
    ports = db.relationship("Port", back_populates="app", lazy=True, cascade="all, delete-orphan")

    def __repr__(self):
        return f"<App {self.name}>"


class Port(db.Model):
    __tablename__ = "ports"

    id = db.Column(db.Integer, primary_key=True)
    app_id = db.Column(db.Integer, db.ForeignKey("apps.id"), nullable=False)
    port_number = db.Column(db.Integer, nullable=False)
    protocol = db.Column(db.String(10), nullable=False, default="TCP")
    description = db.Column(db.String(255), nullable=True)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    # Relationships
    app = db.relationship("App", back_populates="ports")

    __table_args__ = (
        db.UniqueConstraint('app_id', 'port_number', 'protocol', name='unique_port_per_app_protocol'),
    )

    def __repr__(self):
        return f"<Port {self.port_number}/{self.protocol}>"