"""Graph HTTP router — panorama and neighbor query endpoints."""

from __future__ import annotations

from dataclasses import asdict

from fastapi import APIRouter

from app.modules.project.application.services import ProjectService
from app.modules.scanner.application.services import ScanService
from app.modules.graph.application.services import GraphService

router = APIRouter(prefix="/projects/{project_id}/graph", tags=["graph"])

_project_service: ProjectService | None = None
_scan_service: ScanService | None = None
_graph_service: GraphService | None = None


def init_router(
    project_service: ProjectService,
    scan_service: ScanService,
    graph_service: GraphService,
) -> None:
    global _project_service, _scan_service, _graph_service
    _project_service = project_service
    _scan_service = scan_service
    _graph_service = graph_service


def _get_or_trigger_scan(project_id: str):
    """Get cached scan or trigger a new one."""
    result = _scan_service.get_latest_scan(project_id)
    if result is None:
        project = _project_service.get_project(project_id)
        result = _scan_service.scan(project)
    return result


@router.get("")
def get_graph(project_id: str):
    """Build and return the full panorama graph for a project."""
    project = _project_service.get_project(project_id)  # Ensure project exists (raises 404)
    scan_result = _get_or_trigger_scan(project_id)
    view = _graph_service.build_panorama(scan_result, design_dir=project.design_dir)
    return asdict(view)


@router.get("/nodes/{node_id}/neighbors")
def get_neighbors(project_id: str, node_id: str):
    """Return the subgraph of neighbors for a given node."""
    project = _project_service.get_project(project_id)  # Ensure project exists (raises 404)
    scan_result = _get_or_trigger_scan(project_id)
    view = _graph_service.build_panorama(scan_result, design_dir=project.design_dir)
    neighbors = _graph_service.get_neighbors(view, node_id)
    return asdict(neighbors)