"""Web lookup routes — image picker and driver-download search.

Both return HTML fragments for HTMX, never JSON: the results are only ever
rendered into a page, and keeping the shaping server-side means the templates
own the "unverified source" warnings.
"""
from __future__ import annotations

from fastapi import APIRouter, Request
from fastapi.responses import HTMLResponse

from imptune.db.models import Driver, Printer
from imptune.services import websearch
from imptune.templating import templates

router = APIRouter(prefix="/web")

MAX_RESULTS = 12
_TARGETS = ("printer", "driver")


def _notice(key: str, fallback: str, status_code: int = 200) -> HTMLResponse:
    """A one-line status fragment that still speaks French.

    Server-rendered fragments are normally English-only, but these are the
    everyday path (empty search box, disabled feature), so they go through the
    i18n store like the rest of the picker — Alpine initializes the swapped-in
    node, and the English body is the fallback if it does not.
    """
    return HTMLResponse(
        content=f"<p class='dim' x-data x-text=\"$store.i18n.t('{key}')\">{fallback}</p>",
        status_code=status_code,
    )


@router.get("/images", response_class=HTMLResponse)
def search_images(
    request: Request,
    q: str = "",
    target: str = "printer",
    id: int = 0,
) -> HTMLResponse:
    """Image results for `q`, each pickable as the icon of `target`/`id`.

    `target` decides which POST endpoint the result buttons hit, so the picker
    is the same partial for a printer icon and a driver icon.
    """
    if not websearch.enabled():
        return _notice("web_search_off", "Web lookups are disabled on this server.")
    if target not in _TARGETS:
        return _notice("unknown_target", "Unknown search target.", status_code=400)

    # Confirm the caller may write to this entity before spending a search on
    # it — an unowned printer id must not even reveal that it exists.
    if target == "printer":
        owned = Printer.get_or_none(
            (Printer.id == id) & (Printer.owner == request.state.owner)
        )
        if owned is None:
            return _notice("printer_not_found", "Printer not found.", status_code=404)
        post_url = f"/printers/{id}/icon/from-web"
        status_target = "#icon-status"
    else:
        if Driver.get_or_none(Driver.id == id) is None:
            return _notice("driver_not_found", "Driver not found.", status_code=404)
        post_url = f"/drivers/{id}/icon/from-web"
        status_target = f"#driver-icon-status-{id}"

    query = q.strip()
    if not query:
        return _notice("type_to_search_image", "Type something to search for.")

    hits = websearch.search_images(query, limit=MAX_RESULTS)
    return templates.TemplateResponse(
        request=request,
        name="partials/image_results.html",
        context={
            "hits": hits,
            "query": query,
            "post_url": post_url,
            "status_target": status_target,
        },
    )


@router.get("/drivers", response_class=HTMLResponse)
def search_driver_pages(request: Request, q: str = "", mode: str = "generic") -> HTMLResponse:
    """Search the web for a driver download page.

    `mode=generic` rewrites the term into the vendor's universal-driver product
    name (HP UPD, Xerox Global, …); `mode=exact` searches the text as typed.
    Results are plain links — nothing is downloaded, and the partial says so.
    """
    if not websearch.enabled():
        return _notice("web_search_off", "Web lookups are disabled on this server.")

    typed = q.strip()
    if not typed:
        return _notice("type_to_search_driver", "Type a printer model or brand to search for.")

    query = websearch.generic_driver_query(typed) if mode == "generic" else typed
    hits = websearch.search_pages(query, limit=MAX_RESULTS)
    return templates.TemplateResponse(
        request=request,
        name="partials/driver_search_results.html",
        context={
            "hits": hits,
            "query": query,
            "typed": typed,
            "mode": mode,
            "brand": websearch.detect_brand(typed),
        },
    )