class BetPlacementService < ApplicationJob
  queue_as :high

  def perform(args = {})
    # do not proceed if we have already procssed a bet for this tip
    bet = args[:bet]
    # get a valid betfair instance for the account we are using, halt if not valid.
    exchange = Integrations::Betfair::BetManager.new(bet.exchange_account)
    return unless exchange

    last_step = 'Checking event id'
    begin
      # check this bet with the exchange and populate the event id if it is missing

      unless bet.exchange_event_id
        bet.exchange_event_id = exchange.bet_event(bet)
      end
      bet.placement_attempts += 1

      # check the odds are still good at the exchange for that event
      last_step = 'Checking odds'
      prices_and_stakes = exchange.bet_odds(bet)
      prices = prices_and_stakes[:prices]

      bet.exchange_odds = prices_and_stakes
      bet.outcome = 'expired'
      tip_odds = bet.tip_provider_odds.to_f

      # use tip odds or get closest match to tip odds offered by the exchange
      last_step = 'Determining if odds optimal'
      margin = tip_odds * bet.exchange_account.current_stake_strategy[:odds_margin]
      max_tip_odds = tip_odds + margin
      odds_to_execute_at = prices.min_by { |num| (max_tip_odds - num).abs }
      raise 'Cannot determine optimal odds' unless odds_to_execute_at
      if odds_to_execute_at.between?(tip_odds, tip_odds + margin)
        last_step = 'Determining stake and placing bet'
        odds_stake = prices_and_stakes[:stakes][odds_to_execute_at.to_s]

        bet.executed_odds = odds_to_execute_at.to_s
        # stake will always fill the max available or the limits of our stake management - whichever is the lower.
        stake = bet.exchange_account.optimal_stake(bet, exchange.minimum_stake, odds_stake)

        raise 'Optimal stake is zero. Not taking bet' if stake.zero?

        bet.outcome = 'open'
        bet.stake = stake
        bet.expected_value = Bet.calculate_expected_value(stake, odds_to_execute_at)
        if bet.exchange_account.can_bet?
          bet.exchange_bet_id = exchange.place_bet(bet, stake)
        end
      else
        bet.log << '[Bet placement] Tip odds not found in latest prices, nudge too far out'
      end
    rescue Exception => e
      x = "Placement #{bet.placement_attempts}--->Last step: #{last_step}. Error: #{e.message}. Skipping"
      bet.log ||= []
      bet.log << x
      bet.outcome = e.message.include?('PERMISSION_DENIED') ? 'errored' : 'skipped'
    ensure
      bet.save!
    end
  end
end