"""Phase 13: Executive Dashboard — PostureSnapshot model."""

import uuid
from datetime import datetime

from sqlalchemy import (
    Boolean, Column, Date, DateTime, Float, ForeignKey,
    Index, Integer, UniqueConstraint,
)
from sqlalchemy.dialects.postgresql import UUID, JSONB
from sqlalchemy.orm import relationship

from app.database import Base


class PostureSnapshot(Base):
    """
    Daily point-in-time capture of the organisation's security posture.

    Aggregates data from all phases (coverage, risk, ownership, knowledge,
    attack-paths) into a single row that can be trended over time.
    """

    __tablename__ = "posture_snapshots"

    id             = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    snapshot_date  = Column(Date, nullable=False)    # one per calendar day

    # ── Coverage ──────────────────────────────────────────────────────────────
    total_techniques  = Column(Integer, nullable=False, default=0)
    validated_count   = Column(Integer, nullable=False, default=0)
    partial_count     = Column(Integer, nullable=False, default=0)
    not_covered_count = Column(Integer, nullable=False, default=0)
    coverage_pct      = Column(Float, nullable=False, default=0.0)  # 0–100

    # ── Risk ─────────────────────────────────────────────────────────────────
    avg_risk_score     = Column(Float, nullable=False, default=0.0)
    critical_count     = Column(Integer, nullable=False, default=0)
    high_count         = Column(Integer, nullable=False, default=0)
    medium_count       = Column(Integer, nullable=False, default=0)
    low_count          = Column(Integer, nullable=False, default=0)

    # ── Operations ────────────────────────────────────────────────────────────
    open_queue_items   = Column(Integer, nullable=False, default=0)
    orphan_techniques  = Column(Integer, nullable=False, default=0)

    # ── Knowledge ─────────────────────────────────────────────────────────────
    playbook_count     = Column(Integer, nullable=False, default=0)
    lesson_count       = Column(Integer, nullable=False, default=0)

    # ── MTTD (from attack-path executions completed in last 30 d) ────────────
    mttd_avg_seconds   = Column(Float, nullable=True)     # None if no data
    executions_30d     = Column(Integer, nullable=False, default=0)
    detection_rate_30d = Column(Float, nullable=True)     # avg across executions

    # ── Meta ─────────────────────────────────────────────────────────────────
    created_by  = Column(
        UUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True
    )
    created_at  = Column(DateTime, default=datetime.utcnow)
    extra       = Column(JSONB, nullable=True)   # full breakdown / by-tactic

    creator = relationship("User", foreign_keys=[created_by])

    __table_args__ = (
        UniqueConstraint("snapshot_date", name="uq_posture_snapshot_date"),
        Index("ix_posture_snapshots_date", "snapshot_date"),
    )