"""
SQLAlchemy models for SneakyScanner database.

This module defines all database tables for storing scan results, schedules,
alerts, and application settings. The schema supports the full scanning workflow
from port discovery through service detection and SSL/TLS analysis.
"""

from datetime import datetime
from typing import Optional

from sqlalchemy import (
    Boolean,
    Column,
    DateTime,
    Float,
    ForeignKey,
    Integer,
    String,
    Text,
    UniqueConstraint,
)
from sqlalchemy.orm import DeclarativeBase, relationship


class Base(DeclarativeBase):
    """Base class for all SQLAlchemy models."""
    pass


# ============================================================================
# Core Scan Tables
# ============================================================================


class Scan(Base):
    """
    Stores metadata about each scan execution.

    This is the parent table that ties together all scan results including
    sites, IPs, ports, services, certificates, and TLS configuration.
    """
    __tablename__ = 'scans'

    id = Column(Integer, primary_key=True, autoincrement=True)
    timestamp = Column(DateTime, nullable=False, index=True, comment="Scan start time (UTC)")
    duration = Column(Float, nullable=True, comment="Total scan duration in seconds")
    status = Column(String(20), nullable=False, default='running', comment="running, completed, failed")
    config_file = Column(Text, nullable=True, comment="Path to YAML config used")
    title = Column(Text, nullable=True, comment="Scan title from config")
    json_path = Column(Text, nullable=True, comment="Path to JSON report")
    html_path = Column(Text, nullable=True, comment="Path to HTML report")
    zip_path = Column(Text, nullable=True, comment="Path to ZIP archive")
    screenshot_dir = Column(Text, nullable=True, comment="Path to screenshot directory")
    created_at = Column(DateTime, nullable=False, default=datetime.utcnow, comment="Record creation time")
    triggered_by = Column(String(50), nullable=False, default='manual', comment="manual, scheduled, api")
    schedule_id = Column(Integer, ForeignKey('schedules.id'), nullable=True, comment="FK to schedules if triggered by schedule")

    # Relationships
    sites = relationship('ScanSite', back_populates='scan', cascade='all, delete-orphan')
    ips = relationship('ScanIP', back_populates='scan', cascade='all, delete-orphan')
    ports = relationship('ScanPort', back_populates='scan', cascade='all, delete-orphan')
    services = relationship('ScanService', back_populates='scan', cascade='all, delete-orphan')
    certificates = relationship('ScanCertificate', back_populates='scan', cascade='all, delete-orphan')
    tls_versions = relationship('ScanTLSVersion', back_populates='scan', cascade='all, delete-orphan')
    alerts = relationship('Alert', back_populates='scan', cascade='all, delete-orphan')
    schedule = relationship('Schedule', back_populates='scans')

    def __repr__(self):
        return f"<Scan(id={self.id}, title='{self.title}', status='{self.status}')>"


class ScanSite(Base):
    """
    Logical grouping of IPs by site.

    Sites represent logical network segments or locations (e.g., "Production DC",
    "DMZ", "Branch Office") as defined in the scan configuration.
    """
    __tablename__ = 'scan_sites'

    id = Column(Integer, primary_key=True, autoincrement=True)
    scan_id = Column(Integer, ForeignKey('scans.id'), nullable=False, index=True)
    site_name = Column(String(255), nullable=False, comment="Site name from config")

    # Relationships
    scan = relationship('Scan', back_populates='sites')
    ips = relationship('ScanIP', back_populates='site', cascade='all, delete-orphan')

    def __repr__(self):
        return f"<ScanSite(id={self.id}, site_name='{self.site_name}')>"


class ScanIP(Base):
    """
    IP addresses scanned in each scan.

    Stores the target IPs and their ping response status (expected vs. actual).
    """
    __tablename__ = 'scan_ips'

    id = Column(Integer, primary_key=True, autoincrement=True)
    scan_id = Column(Integer, ForeignKey('scans.id'), nullable=False, index=True)
    site_id = Column(Integer, ForeignKey('scan_sites.id'), nullable=False, index=True)
    ip_address = Column(String(45), nullable=False, comment="IPv4 or IPv6 address")
    ping_expected = Column(Boolean, nullable=True, comment="Expected ping response")
    ping_actual = Column(Boolean, nullable=True, comment="Actual ping response")

    # Relationships
    scan = relationship('Scan', back_populates='ips')
    site = relationship('ScanSite', back_populates='ips')
    ports = relationship('ScanPort', back_populates='ip', cascade='all, delete-orphan')

    # Index for efficient IP lookups within a scan
    __table_args__ = (
        UniqueConstraint('scan_id', 'ip_address', name='uix_scan_ip'),
    )

    def __repr__(self):
        return f"<ScanIP(id={self.id}, ip_address='{self.ip_address}')>"


class ScanPort(Base):
    """
    Discovered TCP/UDP ports.

    Stores all open ports found during masscan phase, along with expected vs.
    actual status for drift detection.
    """
    __tablename__ = 'scan_ports'

    id = Column(Integer, primary_key=True, autoincrement=True)
    scan_id = Column(Integer, ForeignKey('scans.id'), nullable=False, index=True)
    ip_id = Column(Integer, ForeignKey('scan_ips.id'), nullable=False, index=True)
    port = Column(Integer, nullable=False, comment="Port number (1-65535)")
    protocol = Column(String(10), nullable=False, comment="tcp or udp")
    expected = Column(Boolean, nullable=True, comment="Was this port expected?")
    state = Column(String(20), nullable=False, default='open', comment="open, closed, filtered")

    # Relationships
    scan = relationship('Scan', back_populates='ports')
    ip = relationship('ScanIP', back_populates='ports')
    services = relationship('ScanService', back_populates='port', cascade='all, delete-orphan')

    # Index for efficient port lookups
    __table_args__ = (
        UniqueConstraint('scan_id', 'ip_id', 'port', 'protocol', name='uix_scan_ip_port'),
    )

    def __repr__(self):
        return f"<ScanPort(id={self.id}, port={self.port}, protocol='{self.protocol}')>"


class ScanService(Base):
    """
    Detected services on open ports.

    Stores nmap service detection results including product names, versions,
    and HTTP/HTTPS information with screenshots.
    """
    __tablename__ = 'scan_services'

    id = Column(Integer, primary_key=True, autoincrement=True)
    scan_id = Column(Integer, ForeignKey('scans.id'), nullable=False, index=True)
    port_id = Column(Integer, ForeignKey('scan_ports.id'), nullable=False, index=True)
    service_name = Column(String(100), nullable=True, comment="Service name (e.g., ssh, http)")
    product = Column(String(255), nullable=True, comment="Product name (e.g., OpenSSH)")
    version = Column(String(100), nullable=True, comment="Version string")
    extrainfo = Column(Text, nullable=True, comment="Additional nmap info")
    ostype = Column(String(100), nullable=True, comment="OS type if detected")
    http_protocol = Column(String(10), nullable=True, comment="http or https (if web service)")
    screenshot_path = Column(Text, nullable=True, comment="Relative path to screenshot")

    # Relationships
    scan = relationship('Scan', back_populates='services')
    port = relationship('ScanPort', back_populates='services')
    certificates = relationship('ScanCertificate', back_populates='service', cascade='all, delete-orphan')

    def __repr__(self):
        return f"<ScanService(id={self.id}, service_name='{self.service_name}', product='{self.product}')>"


class ScanCertificate(Base):
    """
    SSL/TLS certificates discovered on HTTPS services.

    Stores certificate details including validity periods, subject/issuer,
    and flags for self-signed certificates.
    """
    __tablename__ = 'scan_certificates'

    id = Column(Integer, primary_key=True, autoincrement=True)
    scan_id = Column(Integer, ForeignKey('scans.id'), nullable=False, index=True)
    service_id = Column(Integer, ForeignKey('scan_services.id'), nullable=False, index=True)
    subject = Column(Text, nullable=True, comment="Certificate subject (CN)")
    issuer = Column(Text, nullable=True, comment="Certificate issuer")
    serial_number = Column(Text, nullable=True, comment="Serial number")
    not_valid_before = Column(DateTime, nullable=True, comment="Validity start date")
    not_valid_after = Column(DateTime, nullable=True, comment="Validity end date")
    days_until_expiry = Column(Integer, nullable=True, comment="Days until expiration")
    sans = Column(Text, nullable=True, comment="JSON array of SANs")
    is_self_signed = Column(Boolean, nullable=True, default=False, comment="Self-signed certificate flag")

    # Relationships
    scan = relationship('Scan', back_populates='certificates')
    service = relationship('ScanService', back_populates='certificates')
    tls_versions = relationship('ScanTLSVersion', back_populates='certificate', cascade='all, delete-orphan')

    # Index for certificate expiration queries
    __table_args__ = (
        {'comment': 'Index on expiration date for alert queries'},
    )

    def __repr__(self):
        return f"<ScanCertificate(id={self.id}, subject='{self.subject}', days_until_expiry={self.days_until_expiry})>"


class ScanTLSVersion(Base):
    """
    TLS version support and cipher suites.

    Stores which TLS versions (1.0, 1.1, 1.2, 1.3) are supported by each
    HTTPS service, along with accepted cipher suites.
    """
    __tablename__ = 'scan_tls_versions'

    id = Column(Integer, primary_key=True, autoincrement=True)
    scan_id = Column(Integer, ForeignKey('scans.id'), nullable=False, index=True)
    certificate_id = Column(Integer, ForeignKey('scan_certificates.id'), nullable=False, index=True)
    tls_version = Column(String(20), nullable=False, comment="TLS 1.0, TLS 1.1, TLS 1.2, TLS 1.3")
    supported = Column(Boolean, nullable=False, comment="Is this version supported?")
    cipher_suites = Column(Text, nullable=True, comment="JSON array of cipher suites")

    # Relationships
    scan = relationship('Scan', back_populates='tls_versions')
    certificate = relationship('ScanCertificate', back_populates='tls_versions')

    def __repr__(self):
        return f"<ScanTLSVersion(id={self.id}, tls_version='{self.tls_version}', supported={self.supported})>"


# ============================================================================
# Scheduling & Notifications Tables
# ============================================================================


class Schedule(Base):
    """
    Scheduled scan configurations.

    Stores cron-like schedules for automated periodic scanning of network
    infrastructure.
    """
    __tablename__ = 'schedules'

    id = Column(Integer, primary_key=True, autoincrement=True)
    name = Column(String(255), nullable=False, comment="Schedule name (e.g., 'Daily prod scan')")
    config_file = Column(Text, nullable=False, comment="Path to YAML config")
    cron_expression = Column(String(100), nullable=False, comment="Cron-like schedule (e.g., '0 2 * * *')")
    enabled = Column(Boolean, nullable=False, default=True, comment="Is schedule active?")
    last_run = Column(DateTime, nullable=True, comment="Last execution time")
    next_run = Column(DateTime, nullable=True, comment="Next scheduled execution")
    created_at = Column(DateTime, nullable=False, default=datetime.utcnow, comment="Schedule creation time")
    updated_at = Column(DateTime, nullable=False, default=datetime.utcnow, onupdate=datetime.utcnow, comment="Last modification time")

    # Relationships
    scans = relationship('Scan', back_populates='schedule')

    def __repr__(self):
        return f"<Schedule(id={self.id}, name='{self.name}', enabled={self.enabled})>"


class Alert(Base):
    """
    Alert history and notifications sent.

    Stores all alerts generated by the alert rule engine, including severity
    levels and email notification status.
    """
    __tablename__ = 'alerts'

    id = Column(Integer, primary_key=True, autoincrement=True)
    scan_id = Column(Integer, ForeignKey('scans.id'), nullable=False, index=True)
    alert_type = Column(String(50), nullable=False, comment="new_port, cert_expiry, service_change, ping_failed")
    severity = Column(String(20), nullable=False, comment="info, warning, critical")
    message = Column(Text, nullable=False, comment="Human-readable alert message")
    ip_address = Column(String(45), nullable=True, comment="Related IP (optional)")
    port = Column(Integer, nullable=True, comment="Related port (optional)")
    email_sent = Column(Boolean, nullable=False, default=False, comment="Was email notification sent?")
    email_sent_at = Column(DateTime, nullable=True, comment="Email send timestamp")
    created_at = Column(DateTime, nullable=False, default=datetime.utcnow, comment="Alert creation time")

    # Relationships
    scan = relationship('Scan', back_populates='alerts')

    # Index for alert queries by type and severity
    __table_args__ = (
        {'comment': 'Indexes for alert filtering'},
    )

    def __repr__(self):
        return f"<Alert(id={self.id}, alert_type='{self.alert_type}', severity='{self.severity}')>"


class AlertRule(Base):
    """
    User-defined alert rules.

    Configurable rules that trigger alerts based on scan results (e.g.,
    certificates expiring in <30 days, unexpected ports opened).
    """
    __tablename__ = 'alert_rules'

    id = Column(Integer, primary_key=True, autoincrement=True)
    rule_type = Column(String(50), nullable=False, comment="unexpected_port, cert_expiry, service_down, etc.")
    enabled = Column(Boolean, nullable=False, default=True, comment="Is rule active?")
    threshold = Column(Integer, nullable=True, comment="Threshold value (e.g., days for cert expiry)")
    email_enabled = Column(Boolean, nullable=False, default=False, comment="Send email for this rule?")
    created_at = Column(DateTime, nullable=False, default=datetime.utcnow, comment="Rule creation time")

    def __repr__(self):
        return f"<AlertRule(id={self.id}, rule_type='{self.rule_type}', enabled={self.enabled})>"


# ============================================================================
# Settings Table
# ============================================================================


class Setting(Base):
    """
    Application configuration key-value store.

    Stores application settings including SMTP configuration, authentication,
    and retention policies. Values stored as JSON for complex data types.
    """
    __tablename__ = 'settings'

    id = Column(Integer, primary_key=True, autoincrement=True)
    key = Column(String(255), nullable=False, unique=True, index=True, comment="Setting key (e.g., smtp_server)")
    value = Column(Text, nullable=True, comment="Setting value (JSON for complex values)")
    updated_at = Column(DateTime, nullable=False, default=datetime.utcnow, onupdate=datetime.utcnow, comment="Last modification time")

    def __repr__(self):
        return f"<Setting(key='{self.key}', value='{self.value[:50] if self.value else None}...')>"