tier list

lib/cobblemon_ui/tier_list_scraper.ex

@@ -0,0 +1,65 @@
+defmodule CobblemonUi.TierListScraper do
+  @url "https://rankedboost.com/pokemon/tier-list/"
+  @filename "pokemon_tier_list.json"
+
+  def output_file do
+    dir = System.get_env("CACHE_DIR", ".")
+    Path.join(dir, @filename)
+  end
+
+  def run do
+    with {:ok, html} <- fetch_page(),
+         pokemon <- parse(html),
+         :ok <- write_json(pokemon) do
+      {:ok, pokemon}
+    end
+  end
+
+  def fetch_page do
+    case Req.get(@url) do
+      {:ok, %Req.Response{status: 200, body: body}} -> {:ok, body}
+      {:ok, %Req.Response{status: status}} -> {:error, {:http_error, status}}
+      {:error, err} -> {:error, err}
+    end
+  end
+
+  def parse(html) do
+    html
+    |> Floki.parse_document!()
+    |> Floki.find(".pokemon-tier")
+    |> Enum.map(&extract_pokemon/1)
+  end
+
+  defp extract_pokemon(node) do
+    name =
+      node
+      |> Floki.find(".name")
+      |> Floki.text()
+      |> String.trim()
+
+    tier =
+      node
+      |> Floki.find(".tier")
+      |> Floki.text()
+      |> String.trim()
+
+    %{name: name, tier: tier}
+  end
+
+  def write_json(data) do
+    json = Jason.encode!(data, pretty: true)
+    File.write(output_file(), json)
+  end
+
+  # Returns a map of %{lowercase_name => tier} for fast lookup, or an empty map if unavailable.
+  def load_tier_list do
+    with {:ok, contents} <- File.read(output_file()),
+         {:ok, entries} <- Jason.decode(contents) do
+      Map.new(entries, fn %{"name" => name, "tier" => tier} ->
+        {String.downcase(name), tier}
+      end)
+    else
+      _ -> %{}
+    end
+  end
+end