"""Permission template routes — CRUD API for reusable permission presets."""

from __future__ import annotations

import uuid

from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.db import get_db
from app.deps import get_current_user, require_permission
from app.schemas.permission_template import (
    PermissionTemplateCreate,
    PermissionTemplateUpdate,
    PermissionTemplateApply,
)
from app.services import permission_template_service

router = APIRouter(prefix="/api/v1/permission-templates", tags=["permission-templates"])


@router.get("")
async def list_templates(
    entity_type: str | None = None,
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_permission("permissions:templates:read")),
):
    """List all permission templates for the current tenant."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    items = await permission_template_service.list_templates(db, tenant_id, entity_type)
    return {"items": items, "total": len(items)}


@router.post("", status_code=status.HTTP_201_CREATED)
async def create_template(
    body: PermissionTemplateCreate,
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_permission("permissions:templates:write")),
):
    """Create a new permission template."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    try:
        return await permission_template_service.create_template(
            db,
            tenant_id,
            name=body.name,
            entity_type=body.entity_type,
            level=body.level,
            trigger_condition=body.trigger_condition,
            auto_share_with=body.auto_share_with,
        )
    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))


@router.put("/{template_id}")
async def update_template(
    template_id: str,
    body: PermissionTemplateUpdate,
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_permission("permissions:templates:write")),
):
    """Update an existing permission template."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    try:
        return await permission_template_service.update_template(
            db,
            tenant_id,
            template_id,
            name=body.name,
            entity_type=body.entity_type,
            level=body.level,
            trigger_condition=body.trigger_condition,
            auto_share_with=body.auto_share_with,
        )
    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))


@router.delete("/{template_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_template(
    template_id: str,
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_permission("permissions:templates:write")),
):
    """Delete a permission template."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    try:
        await permission_template_service.delete_template(db, tenant_id, template_id)
    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))


@router.post("/apply", status_code=status.HTTP_201_CREATED)
async def apply_template(
    body: PermissionTemplateApply,
    db: AsyncSession = Depends(get_db),
    current_user: dict = Depends(require_permission("permissions:templates:write")),
):
    """Apply a permission template to an entity, creating entity_permissions."""
    tenant_id = uuid.UUID(current_user["tenant_id"])
    user_id = uuid.UUID(current_user["user_id"])
    try:
        result = await permission_template_service.apply_template(
            db,
            tenant_id,
            body.entity_type,
            body.entity_id,
            template_id=body.template_id,
            created_by=user_id,
        )
        return {"applied": result, "count": len(result)}
    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))