"""CRUD router for TestTemplates — predefined test catalog.

Endpoints
---------
GET    /test-templates                          — list with filters + pagination
GET    /test-templates/stats                    — catalog statistics (admin)
GET    /test-templates/{id}                     — detail
POST   /test-templates                          — create custom (admin)
PATCH  /test-templates/{id}                     — update (admin)
PATCH  /test-templates/{id}/toggle-active       — toggle active/inactive (admin)
DELETE /test-templates/{id}                     — soft delete (admin)
GET    /test-templates/by-technique/{mitre_id}  — templates for a MITRE technique

Filters (GET /test-templates)
-----------------------------
- source: atomic_red_team | mitre | custom
- platform: windows | linux | macos
- severity: low | medium | high | critical
- mitre_technique_id: filter by specific technique
- search: full-text search across name and description
- is_active: true | false (default only active)
- offset / limit: pagination (default limit=50)
"""

import uuid
from typing import Optional

from fastapi import APIRouter, Depends, Query, status
from sqlalchemy.orm import Session

from app.database import get_db
from app.dependencies.auth import get_current_user, require_any_role
from app.domain.unit_of_work import UnitOfWork
from app.models.technique import Technique
from app.models.user import User
from app.schemas.test_template import (
    TestTemplateCreate,
    TestTemplateOut,
    TestTemplateSummary,
)
from app.services.audit_service import log_action
from app.services.test_template_service import (
    bulk_activate,
    create_template as create_template_svc,
    get_template_or_raise,
    get_template_stats,
    get_templates_by_technique as templates_by_technique,
    list_templates,
    soft_delete_template,
    toggle_template_active as toggle_template_active_svc,
    update_template as update_template_svc,
)

router = APIRouter(prefix="/test-templates", tags=["test-templates"])


# ---------------------------------------------------------------------------
# GET /test-templates  —  list with filters + pagination
# ---------------------------------------------------------------------------


@router.get("", response_model=list[TestTemplateSummary])
def _list_templates_handler(
    source: Optional[str] = Query(None, description="Filter by source (atomic_red_team, mitre, custom)"),
    platform: Optional[str] = Query(None, description="Filter by platform (windows, linux, macos)"),
    severity: Optional[str] = Query(None, description="Filter by severity (low, medium, high, critical)"),
    mitre_technique_id: Optional[str] = Query(None, description="Filter by MITRE technique ID"),
    search: Optional[str] = Query(None, description="Search in name and description"),
    is_active: Optional[bool] = Query(None, description="Filter by active status (true/false). Omit to return all."),
    offset: int = Query(0, ge=0),
    limit: int = Query(50, ge=1, le=200),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Return a paginated, filterable list of test templates."""
    return list_templates(
        db,
        source=source,
        platform=platform,
        severity=severity,
        mitre_technique_id=mitre_technique_id,
        search=search,
        is_active=is_active,
        offset=offset,
        limit=limit,
    )


# ---------------------------------------------------------------------------
# GET /test-templates/stats  —  catalog statistics (admin)
# ---------------------------------------------------------------------------


@router.get("/stats")
def template_stats(
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role("red_lead", "blue_lead")),
):
    """Return catalog statistics: active, by_source, by_platform."""
    return get_template_stats(db)


# ---------------------------------------------------------------------------
# PATCH /test-templates/bulk-activate  —  activate/deactivate all (admin)
# ---------------------------------------------------------------------------


@router.patch("/bulk-activate")
def bulk_activate_templates(
    activate: bool = Query(True, description="True to activate all, False to deactivate all"),
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role("red_lead", "blue_lead")),
):
    """Set all templates to active or inactive."""
    count = bulk_activate(db, activate=activate)
    with UnitOfWork(db) as uow:
        log_action(
            db,
            user_id=current_user.id,
            action="bulk_activate_templates" if activate else "bulk_deactivate_templates",
            entity_type="test_template",
            entity_id=None,
            details={"affected": count, "is_active": activate},
        )
        uow.commit()

    return {
        "detail": f"{'Activated' if activate else 'Deactivated'} {count} templates",
        "affected": count,
        "is_active": activate,
    }


# ---------------------------------------------------------------------------
# GET /test-templates/by-technique/{mitre_id}
# ---------------------------------------------------------------------------


@router.get("/by-technique/{mitre_id}", response_model=list[TestTemplateSummary])
def _templates_by_technique_handler(
    mitre_id: str,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Return all active templates mapped to a specific MITRE technique."""
    return templates_by_technique(db, mitre_id)


# ---------------------------------------------------------------------------
# GET /test-templates/{id}  —  detail
# ---------------------------------------------------------------------------


@router.get("/{template_id}", response_model=TestTemplateOut)
def get_template(
    template_id: uuid.UUID,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Return full details for a single test template."""
    return get_template_or_raise(db, template_id)


# ---------------------------------------------------------------------------
# POST /test-templates  —  create (admin only)
# ---------------------------------------------------------------------------


@router.post(
    "",
    response_model=TestTemplateOut,
    status_code=status.HTTP_201_CREATED,
)
def create_template(
    payload: TestTemplateCreate,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role("red_lead", "blue_lead")),
):
    """Create a custom test template."""
    template = create_template_svc(db, **payload.model_dump())
    with UnitOfWork(db) as uow:
        # Flag the associated technique for review — new template available
        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="create_test_template",
            entity_type="test_template",
            entity_id=template.id,
            details={
                "name": template.name,
                "source": template.source,
                "mitre_technique_id": template.mitre_technique_id,
            },
        )
        uow.commit()
    db.refresh(template)

    return template


# ---------------------------------------------------------------------------
# PATCH /test-templates/{id}  —  update (admin only)
# ---------------------------------------------------------------------------


@router.patch("/{template_id}", response_model=TestTemplateOut)
def update_template(
    template_id: uuid.UUID,
    payload: TestTemplateCreate,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role("red_lead", "blue_lead")),
):
    """Update fields of an existing test template."""
    template = update_template_svc(db, template_id, **payload.model_dump(exclude_unset=True))
    with UnitOfWork(db) as uow:
        log_action(
            db,
            user_id=current_user.id,
            action="update_test_template",
            entity_type="test_template",
            entity_id=template.id,
            details={"updated_fields": list(payload.model_dump(exclude_unset=True).keys())},
        )
        uow.commit()
    db.refresh(template)

    return template


# ---------------------------------------------------------------------------
# PATCH /test-templates/{id}/toggle-active  —  toggle active/inactive (admin)
# ---------------------------------------------------------------------------


@router.patch("/{template_id}/toggle-active", response_model=TestTemplateOut)
def toggle_template_active(
    template_id: uuid.UUID,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role("red_lead", "blue_lead")),
):
    """Toggle a template between active and inactive (is_active = not is_active)."""
    template = toggle_template_active_svc(db, template_id)
    with UnitOfWork(db) as uow:
        log_action(
            db,
            user_id=current_user.id,
            action="toggle_test_template",
            entity_type="test_template",
            entity_id=template.id,
            details={"name": template.name, "is_active": template.is_active},
        )
        uow.commit()
    db.refresh(template)

    return template


# ---------------------------------------------------------------------------
# DELETE /test-templates/{id}  —  soft delete (admin only)
# ---------------------------------------------------------------------------


@router.delete("/{template_id}", status_code=status.HTTP_200_OK)
def delete_template(
    template_id: uuid.UUID,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_any_role("red_lead", "blue_lead")),
):
    """Soft-delete a test template by setting ``is_active=False``."""
    template = get_template_or_raise(db, template_id)
    soft_delete_template(db, template_id)
    with UnitOfWork(db) as uow:
        log_action(
            db,
            user_id=current_user.id,
            action="delete_test_template",
            entity_type="test_template",
            entity_id=template.id,
            details={"name": template.name},
        )
        uow.commit()

    return {"detail": "Test template deactivated"}