module EffectiveStripeHelper

  STRIPE_CONNECT_AUTHORIZE_URL = 'https://connect.stripe.com/oauth/authorize'
  STRIPE_CONNECT_TOKEN_URL = 'https://connect.stripe.com/oauth/token'

  def is_stripe_connect_seller?(user)
    Effective::Customer.for_buyer(user).stripe_connect_access_token.present?
  end

  def link_to_new_stripe_connect_customer(opts = {})
    client_id = EffectiveOrders.stripe[:connect_client_id]

    raise 'effective_orders config: stripe.connect_client_id has not been set' unless client_id.present?

    authorize_params = {
      response_type: :code,
      client_id: client_id,            # This is the Application's ClientID
      scope: :read_write,
      state: {
        form_authenticity_token: form_authenticity_token,   # Rails standard CSRF
        redirect_to: URI.encode(request.original_url)  # TODO: Allow this to be customized
      }.to_json
    }

    # Add the stripe_user parameter if it's possible
    stripe_user_params = opts.delete :stripe_user
    authorize_params.merge!({stripe_user: stripe_user_params}) if stripe_user_params.is_a?(Hash)

    authorize_url = STRIPE_CONNECT_AUTHORIZE_URL + '?' + authorize_params.to_query
    options = {}.merge(opts)
    link_to image_tag('/assets/effective_orders/stripe_connect.png'), authorize_url, options
  end

  def stripe_plan_description(obj)
    plan = (
      case obj
      when Hash            ; obj
      when ::Stripe::Plan  ; EffectiveOrders.stripe_plans.find { |plan| plan.id == obj.id }
      else                 ; raise 'unexpected object'
      end
    )

    raise("unknown stripe plan: #{obj}") unless plan.kind_of?(Hash) && plan[:id].present?

    plan[:description]
  end

  def stripe_invoice_line_description(line, simple: false)
    [
      "#{line.quantity}x",
      line.plan.name,
      price_to_currency(line.amount),
      ("#{Time.zone.at(line.period.start).strftime('%F')}" unless simple),
      ('to' unless simple),
      ("#{Time.zone.at(line.period.end).strftime('%F')}" unless simple),
      line.description.presence
    ].compact.join(' ')
  end

  def stripe_coupon_description(coupon)
    amount = coupon.amount_off.present? ? ActionController::Base.helpers.price_to_currency(coupon.amount_off) : "#{coupon.percent_off}%"

    if coupon.duration_in_months.present?
      "#{coupon.id} - #{amount} off for #{coupon.duration_in_months} months"
    else
      "#{coupon.id} - #{amount} off #{coupon.duration}"
    end
  end

  def stripe_site_image_url
    return nil unless EffectiveOrders.stripe && (url = EffectiveOrders.stripe[:site_image].to_s).present?
    url.start_with?('http') ? url : asset_url(url)
  end

  def stripe_order_description(order)
    "#{order.num_items} items (#{price_to_currency(order.total)})"
  end

  def stripe_charge_data(order)
    {
      stripe: {
        key: EffectiveOrders.stripe[:publishable_key],
        name: EffectiveOrders.stripe[:site_title],
        image: stripe_site_image_url,
        email: order.user.email,
        amount: order.total,
        description: stripe_order_description(order)
      }.to_json
    }
  end

end