get '/plan/?' do
  @title = 'Support Us'

  if parent_site && parent_site.unconverted_legacy_supporter?
    customer = Stripe::Customer.retrieve(parent_site.stripe_customer_id)
    subscription = customer.subscriptions.first

    # Subscription was deleted, add to free plan.
    if subscription.nil?
      subscription = customer.subscriptions.create plan: 'free'
    end

    parent_site.stripe_subscription_id = subscription.id
    parent_site.plan_type = subscription.plan.id
    parent_site.save_changes
  end

  erb :'plan/index'
end

def is_special_upgrade
  params[:username] && params[:plan_type] == 'special'
end

post '/plan/update' do
  require_login

  if is_special_upgrade
    require_admin
    site = Site[username: params[:username]]

    if site.nil?
      flash[:error] = 'Cannot find the requested user.'
      redirect '/admin'
    end
  end

  site ||= parent_site

  DB.transaction do
    if site.stripe_subscription_id
      customer = Stripe::Customer.retrieve site.stripe_customer_id
      subscription = customer.subscriptions.retrieve site.stripe_subscription_id
      subscription.plan = params[:plan_type]
      subscription.save

      site.update(
        plan_ended: false,
        plan_type: params[:plan_type]
      )
    else
      customer = Stripe::Customer.create(
        card: params[:stripe_token],
        description: "#{site.username} - #{site.id}",
        email: site.email,
        plan: params[:plan_type]
      )

      site.update(
        stripe_customer_id: customer.id,
        stripe_subscription_id: customer.subscriptions.first.id,
        plan_ended: false,
        plan_type: params[:plan_type]
      )
    end
  end

  if site.email
    if is_special_upgrade
      site.send_email(
        subject: "[Neocities] Your site has been upgraded to supporter!",
        body: Tilt.new('./views/templates/email/supporter_upgrade.erb', pretty: true).render(self)
      )

      redirect '/admin'
    else
      site.send_email(
        subject: "[Neocities] You've become a supporter!",
        body: Tilt.new('./views/templates/email_subscription.erb', pretty: true).render(
          self, {
            username:   site.username,
            plan_name:  Site::PLAN_FEATURES[params[:plan_type].to_sym][:name],
            plan_space: Site::PLAN_FEATURES[params[:plan_type].to_sym][:space].to_space_pretty,
            plan_bw:    Site::PLAN_FEATURES[params[:plan_type].to_sym][:bandwidth].to_space_pretty
        })
      )
    end
  end

  if is_special_upgrade
    flash[:success] = "#{site.username} has been upgraded to supporter."
    redirect '/admin'
  end

  redirect params[:plan_type] == 'free' ? '/plan' : '/plan/thanks'
end

get '/plan/thanks' do
  require_login
  erb :'plan/thanks'
end

get '/plan/bitcoin/?' do
  erb :'plan/bitcoin'
end

get '/plan/alternate/?' do
  redirect '/plan/bitcoin'
end

def paypal_recurring_hash
  {
    ipn_url:     "https://neocities.org/webhooks/paypal",
    description: 'Neocities Supporter - Monthly',
    amount:      Site::PLAN_FEATURES[:supporter][:price].to_s,
    currency:    'USD'
  }
end

def paypal_recurring_authorization_hash
  paypal_recurring_hash.merge(
    return_url:  "https://neocities.org/plan/paypal/return",
    cancel_url:  "https://neocities.org/plan",
    ipn_url:     "https://neocities.org/webhooks/paypal"
  )
end

get '/plan/paypal' do
  require_login
  redirect '/plan' if parent_site.supporter?

  hash = paypal_recurring_authorization_hash

  if current_site.paypal_token
    hash.merge! token: current_site.paypal_token
  end

  ppr = PayPal::Recurring.new hash

  paypal_response = ppr.checkout

  redirect paypal_response.checkout_url if paypal_response.valid?
end

get '/plan/paypal/return' do
  require_login

  if params[:token].nil? || params[:PayerID].nil?
    flash[:error] = 'Unknown error, could not complete the request. Please contact Neocities support.'
  end

  ppr = PayPal::Recurring.new(paypal_recurring_hash.merge(
    token:    params[:token],
    payer_id: params[:PayerID]
  ))

  paypal_response = ppr.request_payment
  unless paypal_response.approved? && paypal_response.completed?
    flash[:error] = 'Unknown error, could not complete the request. Please contact Neocities support.'
    redirect '/plan'
  end

  ppr = PayPal::Recurring.new(paypal_recurring_authorization_hash.merge(
    frequency:   1,
    token:       params[:token],
    period:      :monthly,
    reference:   current_site.id.to_s,
    payer_id:    params[:PayerID],
    start_at:    Time.now,
    failed:      3,
    outstanding: :next_billing
  ))

  paypal_response = ppr.create_recurring_profile

  current_site.paypal_token = params[:token]
  current_site.paypal_profile_id = paypal_response.profile_id
  current_site.paypal_active = true
  current_site.plan_type = 'supporter'
  current_site.save_changes validate: false

  redirect '/plan/thanks-paypal'
end

get '/plan/thanks-paypal' do
  require_login
  erb :'plan/thanks-paypal'
end

get '/plan/paypal/cancel' do
  require_login
  redirect '/plan' unless parent_site.paypal_active
  ppr = PayPal::Recurring.new profile_id: parent_site.paypal_profile_id
  ppr.cancel

  parent_site.paypal_active = false
  parent_site.paypal_profile_id = nil
  parent_site.paypal_token = nil
  parent_site.save_changes validate: false
  redirect '/plan'
end