create backend

lib/mound_hunters_web/controllers/api_controller.ex

@@ -0,0 +1,72 @@
+defmodule MoundHuntersWeb.ApiController do
+  @moduledoc """
+  API endpoints for sharing geometries.
+  """
+  import Plug.Conn
+  require Logger
+
+  @doc """
+  Create a new shared geometry.
+  POST /api/share
+  Body: {"geojson": {...}}
+  Returns: {"id": "abc12345"}
+  """
+  def create_share(conn) do
+    with {:ok, body, conn} <- read_body(conn),
+         {:ok, params} <- Jason.decode(body),
+         geojson when is_map(geojson) <- params["geojson"],
+         geojson_str <- Jason.encode!(geojson),
+         {:ok, %{id: id}} <- MoundHunters.Repo.create_geometry(geojson_str) do
+      conn
+      |> put_resp_content_type("application/json")
+      |> put_resp_header("cache-control", "no-cache")
+      |> send_resp(200, Jason.encode!(%{id: id}))
+    else
+      {:error, :invalid_json} ->
+        send_error(conn, 400, "Invalid JSON")
+
+      nil ->
+        send_error(conn, 400, "Missing geojson field")
+
+      {:error, reason} ->
+        Logger.error("Failed to create geometry: #{inspect(reason)}")
+        send_error(conn, 500, "Failed to create geometry")
+
+      _ ->
+        send_error(conn, 400, "Invalid request")
+    end
+  end
+
+  @doc """
+  Get a shared geometry by ID.
+  GET /api/share/:id
+  Returns: {"geojson": {...}}
+  """
+  def get_share(conn) do
+    geometry_id = conn.path_params["id"]
+
+    case MoundHunters.Repo.get_geometry(geometry_id) do
+      {:ok, geometry} ->
+        geojson = Jason.decode!(geometry.geojson)
+
+        conn
+        |> put_resp_content_type("application/json")
+        |> put_resp_header("cache-control", "no-cache")
+        |> send_resp(200, Jason.encode!(%{geojson: geojson}))
+
+      {:error, :not_found} ->
+        send_error(conn, 404, "Geometry not found")
+
+      {:error, reason} ->
+        Logger.error("Failed to get geometry: #{inspect(reason)}")
+        send_error(conn, 500, "Failed to retrieve geometry")
+    end
+  end
+
+  defp send_error(conn, status, message) do
+    conn
+    |> put_private(:error_message, message)
+    |> put_resp_content_type("application/json")
+    |> send_resp(status, Jason.encode!(%{error: message}))
+  end
+end