"""DetectionRule model — detection rules from multiple sources."""

import uuid
from sqlalchemy import Column, String, Text, Boolean, DateTime, Index, func
from sqlalchemy.dialects.postgresql import UUID, JSONB

from app.database import Base


class DetectionRule(Base):
    """
    Detection rule from an external source (Sigma, Elastic, Splunk, custom).

    Each rule is mapped to one MITRE ATT&CK technique via
    ``mitre_technique_id`` and stores the complete rule content in
    ``rule_content``.
    """
    __tablename__ = "detection_rules"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    mitre_technique_id = Column(String, nullable=False)            # e.g. "T1059.001"
    title = Column(String, nullable=False)
    description = Column(Text, nullable=True)
    source = Column(String, nullable=False)                        # sigma / elastic / splunk / custom
    source_id = Column(String, nullable=True)                      # ID in the source repo (for dedup)
    source_url = Column(String, nullable=True)
    rule_content = Column(Text, nullable=False)                    # YAML / KQL / SPL content
    rule_format = Column(String, nullable=False)                   # sigma_yaml / kql / spl / custom
    severity = Column(String, nullable=True)                       # informational / low / medium / high / critical
    platforms = Column(JSONB, nullable=True, default=[])
    log_sources = Column(JSONB, nullable=True)                     # e.g. {"product": "windows", "service": "sysmon"}
    false_positive_rate = Column(String, nullable=True)            # low / medium / high
    is_active = Column(Boolean, default=True)
    created_at = Column(DateTime(timezone=True), server_default=func.now())

    __table_args__ = (
        Index('ix_detection_rules_mitre_technique_id', 'mitre_technique_id'),
        Index('ix_detection_rules_source', 'source'),
        Index('ix_detection_rules_severity', 'severity'),
    )
