from __future__ import annotations

from bom_assistant.scouting.errors import RowNotFoundError, ScoutingValidationError
from bom_assistant.session.models import BomRow, BomSession, RowState
from bom_assistant.suppliers.lcsc.category_resolver import resolve
from bom_assistant.suppliers.lcsc.lcsc import LcscAdapter

_GROUP_FILTER_KEYS = {"Package": "encapValueList", "Manufacturer": "brandIdList"}


def get_row(session: BomSession, row_id: str) -> BomRow:
    for row in session.rows:
        if row.row_id == row_id:
            return row
    raise RowNotFoundError(session.session_id, row_id)


def scout_row(session: BomSession, row_id: str) -> BomRow:
    row = get_row(session, row_id)
    candidates = resolve(row)
    row.scout_candidates = [{"name": c.name, "id": c.id} for c in candidates]
    row.state = RowState.scouting
    return row


def _refresh_filtering(row: BomRow) -> None:
    adapter = LcscAdapter()
    row.facet_groups = adapter.query_facets(row.resolved_category_id, row.applied_filters)
    result = adapter.search(row.resolved_category_id, row.normalized_params, row.applied_filters, page=1)
    row.search_results = result.items
    row.search_meta = {
        "count": result.count,
        "page": result.page,
        "page_size": result.page_size,
        "error": result.error,
    }


def _preseed_package_filter(session: BomSession, row_id: str) -> None:
    row = get_row(session, row_id)
    package = row.normalized_params.package
    if not package:
        return
    options = [opt.get("name") for opt in row.facet_groups.get("Package", [])]
    match = next((opt for opt in options if opt and opt.lower() == package.lower()), None)
    if match:
        apply_filter(session, row_id, "Package", match)


def confirm_category(session: BomSession, row_id: str, category_id: int, category_name: str) -> BomRow:
    row = get_row(session, row_id)
    row.resolved_category_id = category_id
    row.resolved_category_name = category_name
    row.applied_filters = {}
    row.confirmed_pick = None
    row.state = RowState.filtering
    _refresh_filtering(row)
    _preseed_package_filter(session, row_id)
    return row


def apply_filter(session: BomSession, row_id: str, group: str, value: str) -> BomRow:
    row = get_row(session, row_id)
    if row.resolved_category_id is None:
        raise ScoutingValidationError("row has no confirmed category yet")
    key = _GROUP_FILTER_KEYS.get(group)
    if key is None:
        raise ScoutingValidationError(f"unsupported filter group: {group}")
    row.applied_filters.setdefault(key, [])
    if value not in row.applied_filters[key]:
        row.applied_filters[key].append(value)
    _refresh_filtering(row)
    return row


def confirm_pick(session: BomSession, row_id: str, product_code: str) -> BomRow:
    row = get_row(session, row_id)
    pick = next((item for item in row.search_results if item.get("productCode") == product_code), None)
    if pick is None:
        raise ScoutingValidationError(f"product not found in current results: {product_code}")
    row.confirmed_pick = pick
    row.state = RowState.confirmed
    return row