require_relative "test_helper"
require "maptool/kiwix"

# No real network calls — a blank URL and a guaranteed-local connection
# refusal are both fully offline/deterministic; simulating a genuine
# reachable kiwix-serve would need spinning up a real HTTP server for what
# is, at heart, a two-line Net::HTTP wrapper — not worth it, same
# restraint LiveTrackClientTest already applies to its own network path.
class KiwixTest < Minitest::Test
  def test_reachable_is_false_for_a_blank_url
    refute Maptool::Kiwix.reachable?("")
    refute Maptool::Kiwix.reachable?(nil)
  end

  def test_reachable_is_false_when_nothing_is_listening
    refute Maptool::Kiwix.reachable?("http://127.0.0.1:1", open_timeout: 1)
  end

  # A bare TCPServer stub (not WEBrick — not a project dependency, and this
  # only needs to echo back what request line it received) confirms .proxy
  # actually builds the target URL from path + query_string correctly, not
  # just that it can complete *a* request (already covered by nothing here
  # exercising a wrong path/query, unlike .reachable? which only ever hits
  # "/").
  def test_proxy_forwards_path_and_query_and_returns_the_response
    server = TCPServer.new("127.0.0.1", 0)
    port = server.addr[1]
    request_line = nil
    thread = Thread.new do
      client = server.accept
      request_line = client.gets
      client.print("HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nContent-Length: 2\r\n\r\nhi")
      client.close
    end

    response = Maptool::Kiwix.proxy("http://127.0.0.1:#{port}", "/kiwix/search", "pattern=&latitude=1")
    thread.join
    server.close

    assert_equal "GET /kiwix/search?pattern=&latitude=1 HTTP/1.1\r\n", request_line
    assert_equal "200", response.code
    assert_equal "hi", response.body
  end

  def test_proxy_returns_nil_when_nothing_is_listening
    assert_nil Maptool::Kiwix.proxy("http://127.0.0.1:1", "/kiwix/search", "", open_timeout: 1)
  end

  # A path with non-ASCII characters, e.g. an article title like
  # "/kiwix/content/wikipedia/Dlhé_diely" — exactly what Sinatra's splat
  # hands .proxy for a real article link, already URL-*decoded*. Used to
  # raise URI::InvalidComponentError (caught, so this returned nil — every
  # article link 502'd) since URI#path= rejects raw UTF-8 bytes outright
  # instead of escaping them.
  def test_proxy_escapes_non_ascii_characters_in_the_path
    server = TCPServer.new("127.0.0.1", 0)
    port = server.addr[1]
    request_line = nil
    thread = Thread.new do
      client = server.accept
      request_line = client.gets
      client.print("HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nContent-Length: 0\r\n\r\n")
      client.close
    end

    response = Maptool::Kiwix.proxy("http://127.0.0.1:#{port}", "/kiwix/content/wikipedia/Dlhé_diely", "")
    thread.join
    server.close

    assert_equal "GET /kiwix/content/wikipedia/Dlh%C3%A9_diely HTTP/1.1\r\n", request_line
    assert_equal "200", response.code
  end

  # kiwix-serve's own geo search never echoes back a result's coordinates
  # (verified live against a real ZIM) — .nearby fetches each matching
  # article's page too and reads its <meta name="geo.position"> tag, so
  # this stub server has to answer both the search request and each
  # article-page request that follows, in turn.
  def test_nearby_builds_a_feature_per_geotagged_search_result
    server = TCPServer.new("127.0.0.1", 0)
    port = server.addr[1]
    search_xml = <<~XML
      <?xml version="1.0" encoding="UTF-8"?>
      <rss><channel>
        <item><title>Foo</title><link>/kiwix/content/wikipedia/Foo</link></item>
        <item><title>Bar</title><link>/kiwix/content/wikipedia/Bar</link></item>
      </channel></rss>
    XML

    thread = Thread.new do
      # 3, not 2: .nearby fetches every search result's own page to look
      # for coordinates, including Bar's — which turns out to have none
      # and gets filtered out, but the request still happens. Leaving this
      # at 2 the first time round left that third connection's request
      # unaccepted, and it hung for the full default read_timeout instead
      # of failing fast.
      3.times do
        client = server.accept
        request_line = client.gets
        body =
          if request_line.include?("/kiwix/search")
            search_xml
          elsif request_line.include?("/Foo")
            '<meta name="geo.position" content="48.1;17.2">'
          else
            "no coordinates here"
          end
        client.print("HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nContent-Length: #{body.bytesize}\r\n\r\n#{body}")
        client.close
      end
    end

    geojson = Maptool::Kiwix.nearby("http://127.0.0.1:#{port}", [48.0, 17.0, 48.2, 17.3])
    thread.join
    server.close

    assert_equal 1, geojson["features"].size, "Bar has no geo.position tag and must be skipped, not crash"
    feature = geojson["features"].first
    assert_equal "Foo", feature["properties"]["name"]
    assert_equal [17.2, 48.1], feature["geometry"]["coordinates"]
  end

  def test_nearby_returns_an_empty_collection_when_the_search_itself_fails
    geojson = Maptool::Kiwix.nearby("http://127.0.0.1:1", [48.0, 17.0, 48.2, 17.3], open_timeout: 1)
    assert_equal({ "type" => "FeatureCollection", "features" => [] }, geojson)
  end
end