import type {
  AddressLookupInput,
  MothershipAddressCandidate,
} from "@/modules/address/types";
import { AxelHttpClient } from "@/lib/axel/client";
import type { AxelSearchCandidate } from "@/lib/axel/pick-candidate";
import { labelToCandidate } from "@/workers/rpa/address-suggestions";

const UNAVAILABLE_REASON =
  "MotherShip 无法定位此地址，请选择其他候选或修改街道信息";

function buildSearchQuery(address: AddressLookupInput): string {
  return [address.street, address.city, address.state, address.zip]
    .map((part) => part?.trim())
    .filter(Boolean)
    .join(", ");
}

function parseStateFromSecondary(secondary: string): {
  city: string;
  state: string;
  zip: string;
} {
  const m = secondary.match(/^([^,]+),\s*([A-Z]{2})(?:\s+(\d{5}(?:-\d{4})?))?/);
  if (m) {
    return { city: m[1]!.trim(), state: m[2]!, zip: m[3] ?? "" };
  }
  const parts = secondary.split(",").map((p) => p.trim());
  return {
    city: parts[0] ?? "",
    state: parts[1]?.slice(0, 2) ?? "",
    zip: "",
  };
}

/** axel search 行 → 候选；展示文案与 API description 一致 */
export function axelSearchRowToCandidate(
  row: AxelSearchCandidate,
  query: AddressLookupInput,
): MothershipAddressCandidate | null {
  const description = row.description.trim();
  const optionId = row.placeId.trim();
  if (!description || !optionId) {
    return null;
  }

  const parsed = labelToCandidate(description, query);
  if (parsed) {
    return {
      ...parsed,
      option_id: optionId,
      display_label: description,
      formatted_address: description,
    };
  }

  const mainText = (row.mainText ?? description.split(",")[0] ?? "").trim();
  const secondary = (row.secondaryText ?? "").trim();
  const tail = parseStateFromSecondary(secondary);
  if (!mainText) {
    return null;
  }

  return {
    option_id: optionId,
    display_label: description,
    formatted_address: description,
    street: mainText,
    city: tail.city || query.city,
    state: tail.state || query.state,
    zip: tail.zip || query.zip,
  };
}

function sortByStreetNumber(
  candidates: MothershipAddressCandidate[],
  query: AddressLookupInput,
): MothershipAddressCandidate[] {
  const streetNum = query.street.match(/^\d+/)?.[0];
  if (!streetNum) {
    return candidates;
  }
  return [...candidates].sort((a, b) => {
    const aHas = `${a.street} ${a.display_label}`.includes(streetNum);
    const bHas = `${b.street} ${b.display_label}`.includes(streetNum);
    if (aHas === bHas) {
      return 0;
    }
    return aHas ? -1 : 1;
  });
}

function dedupeByOptionId(
  candidates: MothershipAddressCandidate[],
): MothershipAddressCandidate[] {
  const seen = new Set<string>();
  const out: MothershipAddressCandidate[] = [];
  for (const row of candidates) {
    if (seen.has(row.option_id)) {
      continue;
    }
    seen.add(row.option_id);
    out.push(row);
  }
  return out;
}

async function verifyCandidate(
  client: AxelHttpClient,
  candidate: MothershipAddressCandidate,
): Promise<MothershipAddressCandidate> {
  try {
    await client.fetchPlace(candidate.option_id);
    return { ...candidate, selectable: true };
  } catch {
    return {
      ...candidate,
      selectable: false,
      unavailable_reason: UNAVAILABLE_REASON,
    };
  }
}

async function verifyCandidates(
  client: AxelHttpClient,
  candidates: MothershipAddressCandidate[],
): Promise<MothershipAddressCandidate[]> {
  return Promise.all(candidates.map((c) => verifyCandidate(client, c)));
}

function assertHasSelectable(
  candidates: MothershipAddressCandidate[],
  sideLabel: string,
): void {
  if (candidates.some((c) => c.selectable !== false)) {
    return;
  }
  throw new Error(
    `${sideLabel}地址在 MotherShip 均无法定位，请修改街道或城市后重试`,
  );
}

export async function resolveAxelMothershipCandidates(input: {
  pickup: AddressLookupInput;
  delivery: AddressLookupInput;
}): Promise<{
  pickup_candidates: MothershipAddressCandidate[];
  delivery_candidates: MothershipAddressCandidate[];
}> {
  const client = AxelHttpClient.fromStorageStatePath();
  const [pickupRows, deliveryRows] = await Promise.all([
    client.searchLocation(buildSearchQuery(input.pickup)),
    client.searchLocation(buildSearchQuery(input.delivery)),
  ]);

  const pickup_candidates = await verifyCandidates(
    client,
    sortByStreetNumber(
      dedupeByOptionId(
        pickupRows
          .map((row) => axelSearchRowToCandidate(row, input.pickup))
          .filter((row): row is MothershipAddressCandidate => row != null),
      ),
      input.pickup,
    ),
  );
  const delivery_candidates = await verifyCandidates(
    client,
    sortByStreetNumber(
      dedupeByOptionId(
        deliveryRows
          .map((row) => axelSearchRowToCandidate(row, input.delivery))
          .filter((row): row is MothershipAddressCandidate => row != null),
      ),
      input.delivery,
    ),
  );

  if (pickup_candidates.length === 0) {
    throw new Error("MotherShip 未返回提货地址候选");
  }
  if (delivery_candidates.length === 0) {
    throw new Error("MotherShip 未返回派送地址候选");
  }

  assertHasSelectable(pickup_candidates, "提货");
  assertHasSelectable(delivery_candidates, "派送");

  return { pickup_candidates, delivery_candidates };
}