move json to api, change tile loading api

lib/mound_hunters_web/controllers/api_controller.ex

@@ -63,6 +63,66 @@ defmodule MoundHuntersWeb.ApiController do
     end
   end
 
+  @doc """
+  Get tile metadata by ID.
+  GET /api/meta/tile/:id
+  Returns: tile metadata including bounds, status, availability flags
+  """
+  def get_tile(conn) do
+    tile_id = conn.path_params["id"]
+
+    case MoundHunters.Repo.get_tile(tile_id) do
+      {:ok, tile} ->
+        conn
+        |> put_resp_content_type("application/json")
+        |> put_resp_header("cache-control", "public, max-age=60")
+        |> send_resp(200, Jason.encode!(tile))
+
+      {:error, :not_found} ->
+        send_error(conn, 404, "Tile not found")
+
+      {:error, reason} ->
+        Logger.error("Failed to get tile: #{inspect(reason)}")
+        send_error(conn, 500, "Failed to retrieve tile")
+    end
+  end
+
+  @doc """
+  Get tile metadata by coordinates.
+  GET /api/meta/tile?lat=40.0&lng=-82.5
+  Returns: tile metadata for the tile containing the given coordinates
+  """
+  def get_tile_by_coords(conn) do
+    with lat_str when is_binary(lat_str) <- conn.query_params["lat"],
+         lng_str when is_binary(lng_str) <- conn.query_params["lng"],
+         {lat, _} <- Float.parse(lat_str),
+         {lng, _} <- Float.parse(lng_str) do
+      case MoundHunters.Repo.get_tile_at_coords(lat, lng) do
+        {:ok, tile} ->
+          conn
+          |> put_resp_content_type("application/json")
+          |> put_resp_header("cache-control", "public, max-age=60")
+          |> send_resp(200, Jason.encode!(tile))
+
+        {:error, :not_found} ->
+          send_error(conn, 404, "No tile found at coordinates")
+
+        {:error, reason} ->
+          Logger.error("Failed to get tile by coords: #{inspect(reason)}")
+          send_error(conn, 500, "Failed to retrieve tile")
+      end
+    else
+      nil ->
+        send_error(conn, 400, "Missing lat or lng parameter")
+
+      :error ->
+        send_error(conn, 400, "Invalid lat or lng format")
+
+      _ ->
+        send_error(conn, 400, "Invalid request")
+    end
+  end
+
   defp send_error(conn, status, message) do
     conn
     |> put_private(:error_message, message)