prop/lib/microwaveprop/radio/contacts.ex

defmodule Microwaveprop.Radio.Contacts do
  @moduledoc false

  import Ecto.Query

  alias Microwaveprop.Accounts.Scope
  alias Microwaveprop.Accounts.User
  alias Microwaveprop.Cache
  alias Microwaveprop.Radio.BandResolver
  alias Microwaveprop.Radio.Contact
  alias Microwaveprop.Radio.Maidenhead
  alias Microwaveprop.Repo

  @per_page 20
  @max_per_page 200
  @sortable_fields ~w(station1 station2 band mode distance_km qso_timestamp inserted_at)a
  @count_cache_key {__MODULE__, :total_contact_count}
  @count_cache_ttl_ms 30_000
  @map_payload_cache_key {__MODULE__, :contact_map_payload}
  @map_payload_ttl_ms 10 * 60 * 1_000
  @dedup_window_seconds 3600

  @type contact_page :: %{
          entries: [Contact.t()],
          grouped_entries: [{Contact.t(), [Contact.t()]}],
          page: pos_integer(),
          total_pages: pos_integer(),
          total_entries: non_neg_integer()
        }

  # ── Map payload ──

  @spec contact_map_payload() :: %{json: iodata(), count: non_neg_integer(), bands: [integer()]}
  def contact_map_payload do
    if Application.get_env(:microwaveprop, :cache_contact_map, true) do
      Cache.fetch_or_store(@map_payload_cache_key, @map_payload_ttl_ms, fn ->
        build_contact_map_payload()
      end)
    else
      build_contact_map_payload()
    end
  end

  defp build_contact_map_payload do
    contacts = load_contacts_for_map()
    bands = contacts |> Enum.map(fn [_, _, _, _, band | _] -> band end) |> Enum.uniq() |> Enum.sort()
    %{json: Jason.encode_to_iodata!(contacts), count: length(contacts), bands: bands}
  end

  defp load_contacts_for_map do
    from(c in Contact,
      where: not is_nil(c.pos1) and not is_nil(c.pos2) and c.private == false,
      select: %{
        id: c.id,
        pos1: c.pos1,
        pos2: c.pos2,
        band: c.band,
        station1: c.station1,
        station2: c.station2,
        mode: c.mode,
        distance_km: c.distance_km,
        qso_timestamp: c.qso_timestamp
      }
    )
    |> Repo.all()
    |> Enum.map(&format_map_contact/1)
    |> Enum.reject(&is_nil/1)
    |> dedup_map_reciprocals()
  end

  defp format_map_contact(c) do
    lat1 = c.pos1["lat"]
    lon1 = c.pos1["lon"]
    lat2 = c.pos2["lat"]
    lon2 = c.pos2["lon"]

    if lat1 && lon1 && lat2 && lon2 do
      [
        lat1,
        lon1,
        lat2,
        lon2,
        format_map_band(c.band),
        c.station1,
        c.station2,
        c.mode,
        format_map_distance(c.distance_km),
        format_map_timestamp(c.qso_timestamp),
        c.id
      ]
    end
  end

  defp format_map_band(nil), do: 0
  defp format_map_band(band), do: Decimal.to_integer(band)
  defp format_map_distance(nil), do: nil
  defp format_map_distance(d), do: Decimal.to_float(d)
  defp format_map_timestamp(nil), do: nil
  defp format_map_timestamp(ts), do: Calendar.strftime(ts, "%Y-%m-%d %H:%M")

  defp dedup_map_reciprocals(contacts),
    do:
      Enum.uniq_by(contacts, fn [_lat1, _lon1, _lat2, _lon2, band, s1, s2, _mode, _dist, ts, _id] ->
        stations = Enum.sort([s1 || "", s2 || ""])
        hour = if ts, do: String.slice(ts, 0..12), else: ""
        {stations, band, hour}
      end)

  # ── User queries ──

  @spec list_contacts_for_user(User.t(), User.t() | nil) :: [Contact.t()]
  def list_contacts_for_user(%User{} = owner, viewer \\ nil) do
    Contact
    |> where([c], c.user_id == ^owner.id)
    |> filter_private_for_viewer(owner, viewer)
    |> order_by([c], desc: c.qso_timestamp, desc: c.id)
    |> preload(:user)
    |> Repo.all()
  end

  defp filter_private_for_viewer(query, %User{id: owner_id}, %User{id: viewer_id}) when owner_id == viewer_id, do: query
  defp filter_private_for_viewer(query, _owner, %User{is_admin: true}), do: query
  defp filter_private_for_viewer(query, _owner, _viewer), do: where(query, [c], c.private == false)

  @spec list_contacts_involving_callsign(String.t() | nil, User.t() | nil) :: [Contact.t()]
  def list_contacts_involving_callsign(callsign, viewer \\ nil)
  def list_contacts_involving_callsign(callsign, _viewer) when callsign in [nil, ""], do: []

  def list_contacts_involving_callsign(callsign, viewer) when is_binary(callsign) do
    upcased = String.upcase(callsign)

    Contact
    |> where([c], fragment("upper(?)", c.station1) == ^upcased or fragment("upper(?)", c.station2) == ^upcased)
    |> filter_private_for_callsign_viewer(viewer)
    |> order_by([c], desc: c.qso_timestamp, desc: c.id)
    |> limit(100)
    |> preload(:user)
    |> Repo.all()
  end

  defp filter_private_for_callsign_viewer(query, nil), do: where(query, [c], c.private == false)
  defp filter_private_for_callsign_viewer(query, %User{is_admin: true}), do: query

  defp filter_private_for_callsign_viewer(query, %User{callsign: callsign}) do
    upcased = String.upcase(callsign)

    where(
      query,
      [c],
      c.private == false or
        (c.private == true and
           (fragment("upper(?)", c.station1) == ^upcased or fragment("upper(?)", c.station2) == ^upcased))
    )
  end

  # ── Paginated list ──

  @spec list_contacts(keyword()) :: contact_page()
  def list_contacts(opts \\ []) do
    page = max(Keyword.get(opts, :page, 1), 1)
    per_page = clamp_per_page(Keyword.get(opts, :per_page, @per_page))
    offset = (page - 1) * per_page
    search = Keyword.get(opts, :search)
    scope = Keyword.get(opts, :scope)
    {sort_field, sort_dir} = sort_opts(opts)

    base_query = Contact |> maybe_search(search) |> filter_private(scope)
    total_entries = total_entries_for(search, scope, base_query)
    total_pages = max(ceil(total_entries / per_page), 1)

    entries =
      base_query
      |> order_by([q], [{^sort_dir, field(q, ^sort_field)}, {^sort_dir, q.id}])
      |> limit(^per_page)
      |> offset(^offset)
      |> Repo.all()
      |> Repo.preload(:user)

    %{
      entries: entries,
      grouped_entries: group_reciprocals(entries),
      page: page,
      total_pages: total_pages,
      total_entries: total_entries
    }
  end

  defp clamp_per_page(value) when is_integer(value) and value >= 1, do: min(value, @max_per_page)
  defp clamp_per_page(_), do: @per_page

  @spec group_reciprocals([Contact.t()]) :: [{Contact.t(), [Contact.t()]}]
  def group_reciprocals(contacts) do
    contacts |> Enum.group_by(&reciprocal_key/1) |> Enum.map(fn {_key, [primary | rest]} -> {primary, rest} end)
  end

  defp reciprocal_key(contact),
    do: {Enum.sort([contact.station1, contact.station2]), contact.band, reciprocal_hour_key(contact.qso_timestamp)}

  defp reciprocal_hour_key(nil), do: nil
  defp reciprocal_hour_key(%_{} = ts), do: Map.take(ts, [:year, :month, :day, :hour])

  defp total_entries_for(search, nil, query) when search in [nil, ""] do
    if Application.get_env(:microwaveprop, :cache_contact_count, true) do
      Cache.fetch_or_store(@count_cache_key, @count_cache_ttl_ms, fn -> Repo.aggregate(query, :count) end)
    else
      Repo.aggregate(query, :count)
    end
  end

  defp total_entries_for(_search, _scope, query), do: Repo.aggregate(query, :count)

  defp filter_private(query, %Scope{user: %User{is_admin: true}}), do: query

  defp filter_private(query, %Scope{user: %User{id: user_id}}),
    do: where(query, [c], c.private == false or c.user_id == ^user_id)

  defp filter_private(query, _), do: where(query, [c], c.private == false)

  defp maybe_search(query, nil), do: query
  defp maybe_search(query, ""), do: query

  defp maybe_search(query, search) do
    terms = search |> String.split() |> Enum.map(&String.trim/1) |> Enum.reject(&(&1 == ""))

    case terms do
      [a, b] ->
        pa = "%" <> String.upcase(a) <> "%"
        pb = "%" <> String.upcase(b) <> "%"

        where(
          query,
          [q],
          (ilike(q.station1, ^pa) and ilike(q.station2, ^pb)) or (ilike(q.station1, ^pb) and ilike(q.station2, ^pa))
        )

      _ ->
        pattern = "%" <> String.upcase(search) <> "%"
        where(query, [q], ilike(q.station1, ^pattern) or ilike(q.station2, ^pattern))
    end
  end

  defp sort_opts(opts) do
    sort_by = Keyword.get(opts, :sort_by, :qso_timestamp)
    sort_order = Keyword.get(opts, :sort_order, :desc)
    field = if sort_by in @sortable_fields, do: sort_by, else: :qso_timestamp
    dir = if sort_order in [:asc, :desc], do: sort_order, else: :desc
    {field, dir}
  end

  # ── Enrichment status ──

  @enrichable_statuses [:pending, :failed]

  @spec contacts_needing_enrichment(
          atom(),
          non_neg_integer(),
          (Ecto.Query.t() -> Ecto.Query.t()) | nil
        ) :: [Contact.t()]
  def contacts_needing_enrichment(field, limit \\ 500, extra_filter \\ nil) do
    query =
      Contact
      |> where([q], field(q, ^field) in ^@enrichable_statuses and not is_nil(q.pos1))
      |> order_by([q], asc: q.qso_timestamp)
      |> limit(^limit)

    query = if extra_filter, do: extra_filter.(query), else: query
    Repo.all(query)
  end

  @spec unprocessed_contacts(non_neg_integer()) :: [Contact.t()]
  def unprocessed_contacts(limit \\ 500), do: contacts_needing_enrichment(:weather_status, limit)
  @spec unprocessed_hrrr_contacts(non_neg_integer()) :: [Contact.t()]
  def unprocessed_hrrr_contacts(limit \\ 500), do: contacts_needing_enrichment(:hrrr_status, limit)
  @spec unprocessed_terrain_contacts(non_neg_integer()) :: [Contact.t()]
  def unprocessed_terrain_contacts(limit \\ 500),
    do: contacts_needing_enrichment(:terrain_status, limit, &where(&1, [q], not is_nil(q.pos2)))

  @spec unprocessed_iemre_contacts(non_neg_integer()) :: [Contact.t()]
  def unprocessed_iemre_contacts(limit \\ 500), do: contacts_needing_enrichment(:iemre_status, limit)
  @spec unprocessed_radar_contacts(non_neg_integer()) :: [Contact.t()]
  def unprocessed_radar_contacts(limit \\ 500),
    do: contacts_needing_enrichment(:radar_status, limit, &where(&1, [q], not is_nil(q.pos2)))

  @spec set_enrichment_status!([Ecto.UUID.t()], atom(), atom()) :: {non_neg_integer(), nil | [any()]}
  def set_enrichment_status!(ids, field, status) do
    Contact |> where([q], q.id in ^ids and field(q, ^field) != ^status) |> Repo.update_all(set: [{field, status}])
  end

  @spec mark_weather_queued!([Ecto.UUID.t()]) :: {non_neg_integer(), nil | [any()]}
  def mark_weather_queued!(ids), do: set_enrichment_status!(ids, :weather_status, :queued)
  @spec mark_hrrr_queued!([Ecto.UUID.t()]) :: {non_neg_integer(), nil | [any()]}
  def mark_hrrr_queued!(ids), do: set_enrichment_status!(ids, :hrrr_status, :queued)
  @spec mark_terrain_queued!([Ecto.UUID.t()]) :: {non_neg_integer(), nil | [any()]}
  def mark_terrain_queued!(ids), do: set_enrichment_status!(ids, :terrain_status, :queued)
  @spec mark_iemre_queued!([Ecto.UUID.t()]) :: {non_neg_integer(), nil | [any()]}
  def mark_iemre_queued!(ids), do: set_enrichment_status!(ids, :iemre_status, :queued)

  # ── Path points ──

  @spec contact_path_points(Contact.t()) :: [{float(), float()}]
  def contact_path_points(%{pos1: nil}), do: []

  def contact_path_points(%{pos1: pos1, pos2: nil}) do
    lat = pos1["lat"]
    lon = pos1["lon"]
    if lat && lon, do: [{lat, lon}], else: []
  end

  def contact_path_points(%{pos1: pos1, pos2: pos2}), do: build_path_points(extract_latlon(pos1), extract_latlon(pos2))

  defp extract_latlon(%{"lat" => lat} = pos) when is_number(lat), do: if(pos["lon"], do: {lat, pos["lon"]})
  defp extract_latlon(_), do: nil

  defp build_path_points({lat1, lon1}, {lat2, lon2}) do
    {mid_lat, mid_lon} = great_circle_midpoint(lat1, lon1, lat2, lon2)
    [{lat1, lon1}, {mid_lat, mid_lon}, {lat2, lon2}]
  end

  defp build_path_points({lat1, lon1}, _), do: [{lat1, lon1}]
  defp build_path_points(_, _), do: []

  defp great_circle_midpoint(lat1, lon1, lat2, lon2) do
    rlat1 = deg_to_rad(lat1)
    rlat2 = deg_to_rad(lat2)
    rlon1 = deg_to_rad(lon1)
    dlon = deg_to_rad(lon2 - lon1)
    bx = :math.cos(rlat2) * :math.cos(dlon)
    by = :math.cos(rlat2) * :math.sin(dlon)
    mid_lat = :math.atan2(:math.sin(rlat1) + :math.sin(rlat2), :math.sqrt((:math.cos(rlat1) + bx) ** 2 + by ** 2))
    mid_lon = rlon1 + :math.atan2(by, :math.cos(rlat1) + bx)
    {rad_to_deg(mid_lat), normalize_lon(rad_to_deg(mid_lon))}
  end

  defp rad_to_deg(rad), do: rad * 180.0 / :math.pi()
  defp normalize_lon(lon) when lon > 180.0, do: lon - 360.0
  defp normalize_lon(lon) when lon < -180.0, do: lon + 360.0
  defp normalize_lon(lon), do: lon
  defp deg_to_rad(deg), do: deg * :math.pi() / 180

  # ── Haversine / Backfill ──

  @spec haversine_km(number(), number(), number(), number()) :: float()
  defdelegate haversine_km(lat1, lon1, lat2, lon2), to: Microwaveprop.Geo

  @spec backfill_distances([Contact.t()]) :: Postgrex.Result.t() | nil
  def backfill_distances(contacts) do
    updates =
      for contact <- contacts,
          is_nil(contact.distance_km) && contact.pos1 && contact.pos2,
          lat1 = contact.pos1["lat"],
          lon1 = contact.pos1["lon"],
          lat2 = contact.pos2["lat"],
          lon2 = contact.pos2["lon"],
          lat1 && lon1 && lat2 && lon2 do
        dist = lat1 |> haversine_km(lon1, lat2, lon2) |> round()
        {contact.id, dist}
      end

    execute_distance_updates(updates)
  end

  defp execute_distance_updates([]), do: nil

  defp execute_distance_updates(updates) do
    {values_sql, params} =
      updates
      |> Enum.with_index()
      |> Enum.reduce({"", []}, fn {{id, dist}, i}, {sql, params} ->
        frag = "($#{i * 2 + 1}::uuid, $#{i * 2 + 2}::numeric)"
        sep = if sql == "", do: "", else: ", "
        {sql <> sep <> frag, params ++ [Ecto.UUID.dump!(id), dist]}
      end)

    Repo.query!(
      "UPDATE contacts AS c SET distance_km = v.dist FROM (VALUES #{values_sql}) AS v(id, dist) WHERE c.id = v.id",
      params
    )
  end

  # ── Single contact ops ──

  @spec get_contact!(term()) :: Contact.t()
  def get_contact!(id), do: Contact |> Repo.get!(id) |> Repo.preload(:flagged_by_user)

  @spec can_view?(Contact.t(), Scope.t() | nil) :: boolean()
  def can_view?(%Contact{private: false}, _scope), do: true
  def can_view?(%Contact{}, %Scope{user: %User{is_admin: true}}), do: true
  def can_view?(%Contact{user_id: user_id}, %Scope{user: %User{id: user_id}}) when not is_nil(user_id), do: true
  def can_view?(%Contact{}, _scope), do: false

  @spec delete_contact!(Contact.t()) :: Contact.t()
  def delete_contact!(%Contact{} = contact), do: Repo.delete!(contact)

  @spec toggle_flagged_invalid!(Contact.t(), User.t() | nil) :: Contact.t()
  def toggle_flagged_invalid!(contact, flagger \\ nil) do
    new_state = !contact.flagged_invalid

    attrs =
      if new_state do
        %{
          flagged_invalid: true,
          flagged_by_user_id: flagger && flagger.id,
          flagged_at: DateTime.truncate(DateTime.utc_now(), :second)
        }
      else
        %{flagged_invalid: false, flagged_by_user_id: nil, flagged_at: nil}
      end

    contact |> Ecto.Changeset.change(attrs) |> Repo.update!()
  end

  @spec list_flagged_contacts() :: [Contact.t()]
  def list_flagged_contacts do
    Contact |> where([c], c.flagged_invalid == true) |> order_by([c], desc: c.inserted_at, desc: c.id) |> Repo.all()
  end

  @spec change_contact(Contact.t(), map()) :: Ecto.Changeset.t()
  def change_contact(contact, attrs \\ %{}), do: Contact.submission_changeset(contact, attrs)

  @spec owner?(Contact.t(), User.t() | nil) :: boolean()
  def owner?(%Contact{user_id: nil}, _user), do: false
  def owner?(%Contact{}, nil), do: false
  def owner?(%Contact{user_id: uid}, %User{id: uid}), do: true
  def owner?(%Contact{}, %User{}), do: false

  # ── Position resolution ──

  @spec ensure_positions!(Contact.t()) :: Contact.t()
  def ensure_positions!(contact) do
    needs_pos1 = is_nil(contact.pos1) && contact.grid1
    needs_pos2 = is_nil(contact.pos2) && contact.grid2
    if needs_pos1 || needs_pos2, do: do_ensure_positions(contact), else: contact
  end

  defp do_ensure_positions(contact) do
    pos1 = contact.pos1 || latlon_from_grid(contact.grid1)
    pos2 = contact.pos2 || latlon_from_grid(contact.grid2)
    distance = compute_distance(pos1, pos2, contact.distance_km)
    changes = build_position_changes(contact, pos1, pos2, distance)
    apply_position_changes(contact, changes)
  end

  defp compute_distance(pos1, pos2, _existing_distance) when not is_nil(pos1) and not is_nil(pos2) do
    lon1 = pos1["lon"]
    lon2 = pos2["lon"]
    pos1["lat"] |> haversine_km(lon1, pos2["lat"], lon2) |> round() |> Decimal.new()
  end

  defp compute_distance(_pos1, _pos2, existing_distance), do: existing_distance

  defp build_position_changes(contact, pos1, pos2, distance) do
    Enum.reduce([pos1: pos1, pos2: pos2, distance_km: distance], %{}, fn {key, val}, acc ->
      if val && is_nil(Map.get(contact, key)), do: Map.put(acc, key, val), else: acc
    end)
  end

  defp apply_position_changes(contact, changes) when changes == %{}, do: contact

  defp apply_position_changes(contact, changes) do
    changes = reset_enrichment_statuses(contact, changes)
    contact |> Ecto.Changeset.change(changes) |> Repo.update!()
  end

  defp reset_enrichment_statuses(contact, changes) do
    new_pos1 = Map.get(changes, :pos1)
    new_pos2 = Map.get(changes, :pos2)

    changes =
      if new_pos1 do
        changes
        |> maybe_reset_status(:hrrr_status, contact.hrrr_status)
        |> maybe_reset_status(:weather_status, contact.weather_status)
        |> maybe_reset_status(:iemre_status, contact.iemre_status)
      else
        changes
      end

    if new_pos1 && (new_pos2 || contact.pos2),
      do: maybe_reset_status(changes, :terrain_status, contact.terrain_status),
      else: changes
  end

  defp maybe_reset_status(changes, field, :unavailable), do: Map.put(changes, field, :pending)
  defp maybe_reset_status(changes, field, :complete), do: Map.put(changes, field, :pending)
  defp maybe_reset_status(changes, _field, _status), do: changes

  defp latlon_from_grid(nil), do: nil

  defp latlon_from_grid(grid) do
    case Maidenhead.to_latlon(grid) do
      {:ok, {lat, lon}} ->
        %{"lat" => lat, "lon" => lon}

      _ ->
        truncated = String.slice(grid, 0, div(String.length(grid), 2) * 2)

        case Maidenhead.to_latlon(truncated) do
          {:ok, {lat, lon}} -> %{"lat" => lat, "lon" => lon}
          _ -> nil
        end
    end
  end

  # ── Create contact ──

  @spec create_contact(map(), String.t() | nil) ::
          {:ok, Contact.t()} | {:error, Ecto.Changeset.t()} | {:error, :duplicate, Contact.t()}
  def create_contact(attrs, user_id \\ nil) do
    changeset =
      Contact.submission_changeset(
        %Contact{user_id: user_id, submitter_verified: user_id != nil},
        normalize_band_attr(attrs)
      )

    if changeset.valid?, do: insert_validated_contact(changeset), else: {:error, %{changeset | action: :insert}}
  end

  defp normalize_band_attr(attrs) do
    cond do
      raw = Map.get(attrs, "band") ->
        case BandResolver.resolve_as_string(raw) do
          nil -> attrs
          canonical -> Map.put(attrs, "band", canonical)
        end

      raw = Map.get(attrs, :band) ->
        case BandResolver.resolve_as_string(raw) do
          nil -> attrs
          canonical -> Map.put(attrs, :band, canonical)
        end

      true ->
        attrs
    end
  end

  defp insert_validated_contact(changeset) do
    if existing = find_duplicate_contact(changeset) do
      {:error, :duplicate, existing}
    else
      resolve_grids_and_insert(changeset)
    end
  end

  defp resolve_grids_and_insert(changeset) do
    grid1 = Ecto.Changeset.get_change(changeset, :grid1)
    grid2 = Ecto.Changeset.get_change(changeset, :grid2)

    case {Maidenhead.to_latlon(grid1), Maidenhead.to_latlon(grid2)} do
      {{:ok, {lat1, lon1}}, {:ok, {lat2, lon2}}} ->
        distance = lat1 |> haversine_km(lon1, lat2, lon2) |> round() |> Decimal.new()

        result =
          changeset
          |> Ecto.Changeset.put_change(:pos1, %{"lat" => lat1, "lon" => lon1})
          |> Ecto.Changeset.put_change(:pos2, %{"lat" => lat2, "lon" => lon2})
          |> Ecto.Changeset.put_change(:distance_km, distance)
          |> Ecto.Changeset.put_change(:user_submitted, true)
          |> Repo.insert()

        with {:ok, _} <- result, do: invalidate_contact_map_caches()
        result

      _ ->
        changeset = Ecto.Changeset.add_error(changeset, :grid1, "could not resolve grid to coordinates")
        {:error, %{changeset | action: :insert}}
    end
  rescue
    _e in Ecto.ConstraintError ->
      case find_duplicate_contact(changeset) do
        nil -> {:error, :constraint_error}
        existing -> {:error, :duplicate, existing}
      end
  end

  defp find_duplicate_contact(changeset) do
    s1 = changeset |> Ecto.Changeset.get_field(:station1) |> to_string() |> String.upcase()
    s2 = changeset |> Ecto.Changeset.get_field(:station2) |> to_string() |> String.upcase()
    g1 = changeset |> Ecto.Changeset.get_field(:grid1) |> to_string() |> String.upcase()
    g2 = changeset |> Ecto.Changeset.get_field(:grid2) |> to_string() |> String.upcase()
    band = Ecto.Changeset.get_field(changeset, :band)
    ts = Ecto.Changeset.get_field(changeset, :qso_timestamp)
    band_decimal = if is_binary(band), do: Decimal.new(band), else: band
    min_ts = DateTime.add(ts, -@dedup_window_seconds, :second)
    max_ts = DateTime.add(ts, @dedup_window_seconds, :second)

    Repo.one(
      from(c in Contact,
        where:
          c.band == ^band_decimal and c.qso_timestamp >= ^min_ts and c.qso_timestamp <= ^max_ts and
            c.flagged_invalid == false and fragment("LEAST(UPPER(station1), UPPER(station2)) = ?", ^min(s1, s2)) and
            fragment("GREATEST(UPPER(station1), UPPER(station2)) = ?", ^max(s1, s2)) and
            fragment("LEAST(UPPER(grid1), UPPER(grid2)) = ?", ^min(g1, g2)) and
            fragment("GREATEST(UPPER(grid1), UPPER(grid2)) = ?", ^max(g1, g2))
      )
    )
  end

  @doc false
  @spec invalidate_contact_map_caches() :: :ok
  def invalidate_contact_map_caches do
    Cache.invalidate(@count_cache_key)
    Cache.invalidate(@map_payload_cache_key)
    Cache.invalidate(MicrowavepropWeb.ContactMapController.cache_key())
    :ok
  end
end