module QuakeFeed

# File lib/quake_feed.rb, line 14
def fetch_recent(fetch: nil)
  payload = if fetch
              JSON.parse(fetch.call(FEED_URL))
            else
              RabbotHttp.fetch_json(FEED_URL)
            end
  parse_geojson(payload)
rescue StandardError
  []
end

# File lib/quake_feed.rb, line 51
def format_recent(events)
  lines = [
    IrcFormat.report_header(tag: "QUAKE", title: "Recent AU-region events", style: STYLE_TITLE)
  ]
  if events.empty?
    lines << "No recent earthquakes in the AU region."
  else
    events.first(5).each do |event|
      lines << "M#{event[:magnitude]} — #{event[:place]} — #{format_time(event[:time])}"
    end
  end
  lines << IrcFormat.report_footer("USGS · AU region")
  lines.join("\n")
end

# File lib/quake_feed.rb, line 43
def format_time(ms)
  return "unknown time" if ms.nil?

  Time.at(ms.to_i / 1000).utc.strftime("%Y-%m-%d %H:%M UTC")
rescue StandardError
  "unknown time"
end

# File lib/quake_feed.rb, line 25
def parse_geojson(payload)
  return [] unless payload.is_a?(Hash)

  Array(payload["features"]).filter_map do |feature|
    next unless feature.is_a?(Hash)

    props = feature["properties"] || {}
    coords = feature.dig("geometry", "coordinates") || []
    {
      id: feature["id"].to_s,
      magnitude: props["mag"].to_f,
      place: props["place"].to_s.strip,
      time: props["time"],
      depth: coords[2]
    }
  end
end