"""Scoring endpoints — technique, tactic, threat actor, and organization scores.

Provides granular scoring with breakdowns and configurable weights.
"""

from typing import Optional

from fastapi import APIRouter, Depends, HTTPException, Query
from pydantic import BaseModel
from sqlalchemy.orm import Session

from app.database import get_db
from app.dependencies.auth import get_current_user, require_role
from app.models.user import User
from app.models.technique import Technique
from app.models.threat_actor import ThreatActor
from app.config import settings
from app.services.scoring_service import (
    calculate_technique_score,
    calculate_tactic_score,
    calculate_actor_coverage_score,
    calculate_organization_score,
    get_score_history,
)

router = APIRouter(prefix="/scores", tags=["scores"])


# ── GET /scores/technique/{mitre_id} ─────────────────────────────────


@router.get("/technique/{mitre_id}")
def score_technique(
    mitre_id: str,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Get detailed score with breakdown for a specific technique."""
    technique = (
        db.query(Technique)
        .filter(Technique.mitre_id == mitre_id)
        .first()
    )
    if not technique:
        raise HTTPException(status_code=404, detail="Technique not found")

    result = calculate_technique_score(technique, db)

    return {
        "mitre_id": technique.mitre_id,
        "name": technique.name,
        "tactic": technique.tactic,
        "status_global": technique.status_global.value if technique.status_global else None,
        **result,
    }


# ── GET /scores/tactic/{tactic} ──────────────────────────────────────


@router.get("/tactic/{tactic}")
def score_tactic(
    tactic: str,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Get average score for a tactic."""
    return calculate_tactic_score(tactic, db)


# ── GET /scores/threat-actor/{id} ────────────────────────────────────


@router.get("/threat-actor/{actor_id}")
def score_threat_actor(
    actor_id: str,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Get coverage score against a specific threat actor."""
    actor = db.query(ThreatActor).filter(ThreatActor.id == actor_id).first()
    if not actor:
        raise HTTPException(status_code=404, detail="Threat actor not found")

    return calculate_actor_coverage_score(actor_id, db)


# ── GET /scores/organization ─────────────────────────────────────────


@router.get("/organization")
def score_organization(
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Get the overall organization security score (cached for 5 min)."""
    from app.services.score_cache import get_organization_score_cached

    return get_organization_score_cached(db)


# ── GET /scores/history ──────────────────────────────────────────────


@router.get("/history")
def score_history(
    period: str = Query("90d", pattern="^(30d|90d|1y)$"),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Get historical score data points (weekly)."""
    return get_score_history(db, period)


# ── GET /scores/config ───────────────────────────────────────────────


@router.get("/config")
def get_scoring_config(
    current_user: User = Depends(require_role("admin")),
):
    """Get current scoring weights (admin only)."""
    return {
        "weights": {
            "tests": settings.SCORING_WEIGHT_TESTS,
            "detection_rules": settings.SCORING_WEIGHT_DETECTION_RULES,
            "d3fend": settings.SCORING_WEIGHT_D3FEND,
            "freshness": settings.SCORING_WEIGHT_FRESHNESS,
            "platform_diversity": settings.SCORING_WEIGHT_PLATFORM_DIVERSITY,
        },
        "total": (
            settings.SCORING_WEIGHT_TESTS
            + settings.SCORING_WEIGHT_DETECTION_RULES
            + settings.SCORING_WEIGHT_D3FEND
            + settings.SCORING_WEIGHT_FRESHNESS
            + settings.SCORING_WEIGHT_PLATFORM_DIVERSITY
        ),
    }


# ── PATCH /scores/config ─────────────────────────────────────────────


class ScoringConfigUpdate(BaseModel):
    tests: Optional[int] = None
    detection_rules: Optional[int] = None
    d3fend: Optional[int] = None
    freshness: Optional[int] = None
    platform_diversity: Optional[int] = None


@router.patch("/config")
def update_scoring_config(
    payload: ScoringConfigUpdate,
    current_user: User = Depends(require_role("admin")),
):
    """Update scoring weights (admin only).

    Note: Since we're using Opcion A (env vars / Settings), changes
    are applied at runtime but won't persist across restarts unless
    the .env file is also updated. For production, consider migrating
    to Option B (database table).
    """
    if payload.tests is not None:
        settings.SCORING_WEIGHT_TESTS = payload.tests
    if payload.detection_rules is not None:
        settings.SCORING_WEIGHT_DETECTION_RULES = payload.detection_rules
    if payload.d3fend is not None:
        settings.SCORING_WEIGHT_D3FEND = payload.d3fend
    if payload.freshness is not None:
        settings.SCORING_WEIGHT_FRESHNESS = payload.freshness
    if payload.platform_diversity is not None:
        settings.SCORING_WEIGHT_PLATFORM_DIVERSITY = payload.platform_diversity

    # Weights changed — bust the score cache
    from app.services.score_cache import invalidate
    invalidate()

    return {
        "message": "Scoring config updated",
        "weights": {
            "tests": settings.SCORING_WEIGHT_TESTS,
            "detection_rules": settings.SCORING_WEIGHT_DETECTION_RULES,
            "d3fend": settings.SCORING_WEIGHT_D3FEND,
            "freshness": settings.SCORING_WEIGHT_FRESHNESS,
            "platform_diversity": settings.SCORING_WEIGHT_PLATFORM_DIVERSITY,
        },
        "total": (
            settings.SCORING_WEIGHT_TESTS
            + settings.SCORING_WEIGHT_DETECTION_RULES
            + settings.SCORING_WEIGHT_D3FEND
            + settings.SCORING_WEIGHT_FRESHNESS
            + settings.SCORING_WEIGHT_PLATFORM_DIVERSITY
        ),
    }