"""Router for operator template-proposal review.

Endpoints
---------
POST /template-suggestions              — propose a new template (red_tech/blue_tech)
GET  /template-suggestions               — list pending suggestions (lead/admin)
POST /template-suggestions/{id}/approve  — create the template, with optional edits (lead/admin)
POST /template-suggestions/{id}/reject   — discard the suggestion (lead/admin)

A red_lead only ever sees/acts on "red" team suggestions, a blue_lead only
"blue" — admins can see and act on both.
"""

import uuid

from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session

from app.database import get_db
from app.dependencies.auth import require_any_role_strict
from app.domain.errors import EntityNotFoundError, InvalidOperationError
from app.domain.unit_of_work import UnitOfWork
from app.models.technique import Technique
from app.models.template_suggestion import TemplateSuggestion
from app.models.user import User
from app.schemas.template_suggestion import (
    TemplateSuggestionApprove,
    TemplateSuggestionCreate,
    TemplateSuggestionOut,
)
from app.services.audit_service import log_action
from app.services.template_suggestion_service import (
    approve_template_suggestion as approve_suggestion_svc,
)
from app.services.template_suggestion_service import (
    create_template_suggestion as create_suggestion_svc,
)
from app.services.template_suggestion_service import (
    list_pending_template_suggestions,
)
from app.services.template_suggestion_service import (
    reject_template_suggestion as reject_suggestion_svc,
)

router = APIRouter(prefix="/template-suggestions", tags=["template-suggestions"])


def _team_for_lead(user: User) -> str | None:
    """Return the single team a non-admin lead is scoped to, or None for admin (both)."""
    if user.role == "red_lead":
        return "red"
    if user.role == "blue_lead":
        return "blue"
    return None


def _to_out(suggestion: TemplateSuggestion) -> TemplateSuggestionOut:
    out = TemplateSuggestionOut.model_validate(suggestion)
    if suggestion.submitter:
        out.submitter_name = suggestion.submitter.username or suggestion.submitter.email
    return out


@router.post("", response_model=TemplateSuggestionOut, status_code=201)
def propose_template(
    payload: TemplateSuggestionCreate,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role_strict("red_tech", "blue_tech")),
) -> TemplateSuggestionOut:
    """Propose a new test template. Lands in the review queue, not the live catalog."""
    with UnitOfWork(db) as uow:
        suggestion = create_suggestion_svc(db, current_user, **payload.model_dump())
        log_action(
            db, user_id=current_user.id, action="propose_test_template",
            entity_type="template_suggestion", entity_id=suggestion.id,
            details={"name": suggestion.name, "mitre_technique_id": suggestion.mitre_technique_id},
        )
        uow.commit()
    db.refresh(suggestion)
    return _to_out(suggestion)


@router.get("", response_model=list[TemplateSuggestionOut])
def list_suggestions(
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role_strict("red_lead", "blue_lead", "admin")),
) -> list[TemplateSuggestionOut]:
    """List pending template suggestions, scoped to the caller's team (admins see both)."""
    team = _team_for_lead(current_user)
    suggestions = list_pending_template_suggestions(db, team=team)
    return [_to_out(s) for s in suggestions]


@router.post("/{suggestion_id}/approve", response_model=TemplateSuggestionOut)
def approve_suggestion(
    suggestion_id: uuid.UUID,
    payload: TemplateSuggestionApprove | None = None,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role_strict("red_lead", "blue_lead", "admin")),
) -> TemplateSuggestionOut:
    """Approve a suggestion, optionally editing fields, creating the real template."""
    _check_team_permission(current_user, _team_or_404(db, suggestion_id))
    overrides = payload.model_dump(exclude_unset=True) if payload else {}
    try:
        with UnitOfWork(db) as uow:
            suggestion, template = approve_suggestion_svc(db, suggestion_id, current_user, overrides)
            if template.mitre_technique_id:
                technique = (
                    db.query(Technique)
                    .filter(Technique.mitre_id == template.mitre_technique_id)
                    .first()
                )
                if technique:
                    technique.review_required = True
            log_action(
                db, user_id=current_user.id, action="approve_template_suggestion",
                entity_type="template_suggestion", entity_id=suggestion.id,
                details={"created_template_id": str(template.id), "team": suggestion.team},
            )
            uow.commit()
    except EntityNotFoundError as e:
        raise HTTPException(status_code=404, detail=str(e)) from e
    except InvalidOperationError as e:
        raise HTTPException(status_code=400, detail=str(e)) from e
    db.refresh(suggestion)
    return _to_out(suggestion)


@router.post("/{suggestion_id}/reject", response_model=TemplateSuggestionOut)
def reject_suggestion(
    suggestion_id: uuid.UUID,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role_strict("red_lead", "blue_lead", "admin")),
) -> TemplateSuggestionOut:
    """Discard a suggestion without creating a template."""
    _check_team_permission(current_user, _team_or_404(db, suggestion_id))
    try:
        with UnitOfWork(db) as uow:
            suggestion = reject_suggestion_svc(db, suggestion_id, current_user)
            log_action(
                db, user_id=current_user.id, action="reject_template_suggestion",
                entity_type="template_suggestion", entity_id=suggestion.id,
                details={"team": suggestion.team},
            )
            uow.commit()
    except EntityNotFoundError as e:
        raise HTTPException(status_code=404, detail=str(e)) from e
    except InvalidOperationError as e:
        raise HTTPException(status_code=400, detail=str(e)) from e
    db.refresh(suggestion)
    return _to_out(suggestion)


def _team_or_404(db: Session, suggestion_id: uuid.UUID) -> str:
    """Look up just the team of a suggestion, for a permission check before mutating it."""
    suggestion = db.query(TemplateSuggestion).filter(TemplateSuggestion.id == suggestion_id).first()
    if suggestion is None:
        raise HTTPException(status_code=404, detail="Template suggestion not found")
    return suggestion.team


def _check_team_permission(user: User, team: str) -> None:
    """Raise 403 if a non-admin lead tries to act on the other team's suggestion."""
    scoped_team = _team_for_lead(user)
    if scoped_team is not None and scoped_team != team:
        raise HTTPException(status_code=403, detail=f"Not authorized to review {team} team suggestions")