require 'gun_broker/token_header'

module GunBroker
  # Used to scope {Item} lookup by {User}.
  class ItemsDelegate

    include GunBroker::TokenHeader

    # @param user [User] A {User} instance to scope items by.
    def initialize(user)
      @user = user
    end

    # Returns all the User's items.
    # @note {API#get! GET} /Items
    # @raise [GunBroker::Error::NotAuthorized] If the {User#token} isn't valid.
    # @raise [GunBroker::Error::RequestError] If there's an issue with the request (usually a `5xx` response).
    # @return [Array<Item>]
    def all
      response = GunBroker::API.get('/Items', { 'SellerName' => @user.username }, token_header(@user.token))
      items_from_results(response['results'])
    end

    # Returns all the items the User has bid on.
    # @note {API#get! GET} /ItemsBidOn
    # @raise (see #all)
    # @return [Array<Item>]
    def bid_on
      response = GunBroker::API.get('/ItemsBidOn', {}, token_header(@user.token))
      items_from_results(response['results'])
    end

    # Finds a specific User's Item by ID. Calls {Item.find} to get full Item details.
    # @raise (see #all)
    # @return [Item] Returns the Item or `nil` if no Item found.
    def find(item_id)
      # HACK: This has to filter through `#all`, since the GunBroker API currently has no way to scope the `/Items/{itemID}` endpoint by user.
      if all.select { |item| item.id.to_s == item_id.to_s }.first
        GunBroker::Item.find(item_id)
      else
        nil
      end
    end

    # Same as {#find} but raises GunBroker::Error::NotFound if no item is found.
    # @raise (see #all)
    # @raise [GunBroker::Error::NotFound] If the User has no Item with `item_id`.
    # @return [Item] Returns the Item or `nil` if no Item found.
    def find!(item_id)
      item = find(item_id)
      raise GunBroker::Error::NotFound.new("Couldn't find item with ID '#{item_id}'") if item.nil?
      item
    end

    # Items the User has bid on, but not won.
    # @note {API#get! GET} /ItemsNotWon
    # @raise (see #all)
    # @return [Array<Item>]
    def not_won
      response = GunBroker::API.get('/ItemsNotWon', {}, token_header(@user.token))
      items_from_results(response['results'])
    end

    # Items the User has sold.
    # @note {API#get! GET} /ItemsSold
    # @raise (see #all)
    # @return [Array<Item>]
    def sold
      response = GunBroker::API.get('/ItemsSold', {}, token_header(@user.token))
      items_from_results(response['results'])
    end

    # Items that were listed, but not sold.
    # @note {API#get! GET} /ItemsUnsold
    # @raise (see #all)
    # @return [Array<Item>]
    def unsold
      response = GunBroker::API.get('/ItemsUnsold', {}, token_header(@user.token))
      items_from_results(response['results'])
    end

    # Items the User has won.
    # @note {API#get! GET} /ItemsWon
    # @raise (see #all)
    # @return [Array<Item>]
    def won
      response = GunBroker::API.get('/ItemsWon', {}, token_header(@user.token))
      items_from_results(response['results'])
    end

    private

    def items_from_results(results)
      results.map { |result| GunBroker::Item.new(result) }
    end

  end
end