from pathlib import Path

from fastapi import APIRouter, HTTPException
from fastapi.responses import FileResponse

from app.core.files import settings_backup_root
from app.schemas.common import ApiResponse
from app.services.settings_service import (
    backup_current_settings,
    export_settings_snapshot,
    get_settings_payload,
    import_settings_snapshot,
    list_settings_backups,
    update_settings_payload,
    validate_settings_payload,
)

router = APIRouter(tags=["settings"])


@router.get("/settings", response_model=ApiResponse)
def get_settings() -> ApiResponse:
    return ApiResponse(data=get_settings_payload())


@router.put("/settings", response_model=ApiResponse)
def update_settings(payload: dict) -> ApiResponse:
    return ApiResponse(message="settings updated", data=update_settings_payload(payload))


@router.get("/settings/export", response_model=ApiResponse)
def export_settings() -> ApiResponse:
    return ApiResponse(message="settings exported", data=export_settings_snapshot())


@router.post("/settings/import", response_model=ApiResponse)
def import_settings(payload: dict) -> ApiResponse:
    try:
        settings_payload = import_settings_snapshot(payload)
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    return ApiResponse(message="settings imported", data=settings_payload)


@router.post("/settings/validate-import", response_model=ApiResponse)
def validate_import_settings(payload: dict) -> ApiResponse:
    try:
        validate_settings_payload(payload.get("settings", payload))
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc
    return ApiResponse(message="settings payload valid", data={"valid": True})


@router.post("/settings/backup", response_model=ApiResponse)
def create_settings_backup() -> ApiResponse:
    return ApiResponse(message="settings backed up", data=backup_current_settings("manual"))


@router.get("/settings/backups", response_model=ApiResponse)
def get_settings_backups() -> ApiResponse:
    return ApiResponse(data=list_settings_backups())


@router.get("/settings/backups/download/{filename}")
def download_settings_backup(filename: str):
    path = settings_backup_root() / Path(filename).name
    if not path.exists():
        raise HTTPException(status_code=404, detail="backup not found")
    return FileResponse(path, filename=path.name)