module FuelNsw

# File lib/fuel_nsw.rb, line 80
def cheapest(prices)
  prices.min_by { |row| row[:price] }
end

# File lib/fuel_nsw.rb, line 49
def fetch_location_prices(postcode:, fuel_type:, token:, fetch: nil, suburb: nil)
  fuel_code = resolve_fuel_type(fuel_type)
  return [] unless fuel_code

  url = location_url(postcode: postcode, fuel_code: fuel_code, suburb: suburb)
  body = if fetch
           fetch.call(url, headers: { "Authorization" => "Bearer #{token}" })
         else
           RabbotHttp.fetch(url, user_agent: "Rabbot/1.0")
         end
  parse_prices(JSON.parse(body))
rescue StandardError
  []
end

# File lib/fuel_nsw.rb, line 24
def fetch_token(key:, secret:, fetch: nil)
  url = "#{FuelConfig::API_BASE}#{FuelConfig::TOKEN_PATH}"
  auth = Base64.strict_encode64("#{key}:#{secret}")
  if fetch
    body = fetch.call(url, method: :post, headers: { "Authorization" => "Basic #{auth}" })
  else
    body = RabbotHttp.fetch(url, user_agent: "Rabbot/1.0")
  end
  payload = JSON.parse(body)
  payload["access_token"].to_s
rescue StandardError
  nil
end

# File lib/fuel_nsw.rb, line 84
def format_cheapest(fuel_type, postcode, row)
  lines = [
    IrcFormat.report_header(tag: "FUEL", title: "Cheapest #{fuel_type} · #{postcode}", style: STYLE_TITLE)
  ]
  if row.nil?
    lines << "No prices found."
  else
    lines << "#{row[:name]} — #{row[:suburb]} — #{format('%.1f', row[:price])}c/L"
  end
  lines << IrcFormat.report_footer("FuelCheck NSW", "api.nsw.gov.au")
  lines.join("\n")
end

# File lib/fuel_nsw.rb, line 38
def location_url(postcode:, fuel_code:, suburb: nil)
  base = "#{FuelConfig::API_BASE}/FuelPriceCheck/v2/fuel/prices/location"
  params = { postcode: postcode.to_s.strip, fueltype: fuel_code }
  params[:suburb] = suburb if suburb
  "#{base}?#{params.map { |k, v| "#{CGI.escape(k.to_s)}=#{CGI.escape(v.to_s)}" }.join('&')}"
end

# File lib/fuel_nsw.rb, line 64
def parse_prices(payload)
  stations = payload["stations"] || payload["prices"] || payload
  Array(stations).filter_map do |row|
    next unless row.is_a?(Hash)

    price = row["price"] || row["fuelPrice"]
    next if price.nil?

    {
      name: (row["name"] || row["stationName"]).to_s.strip,
      suburb: (row["suburb"] || row["address"]).to_s.strip,
      price: price.to_f
    }
  end
end

# File lib/fuel_nsw.rb, line 45
def resolve_fuel_type(text)
  FUEL_TYPES[text.to_s.strip.downcase]
end