Add insider discounts (#7150)

* Add insider discounts

* Prepare stripe for 100% off coupons

* Remove typo

app/commands/user/generate_bootcamp_affiliate_coupon_code.rb

@@ -0,0 +1,34 @@
+class User::GenerateBootcampAffiliateCouponCode
+  include Mandate
+
+  initialize_with :user
+
+  def call
+    # Easy cheap guard
+    return if user_data.bootcamp_affiliate_coupon_code.present?
+
+    # Now things get expensive with Stripe call and lock below
+    code = generate_coupon_code
+    user_data.with_lock do
+      return if user_data.bootcamp_affiliate_coupon_code.present?
+
+      user_data.update!(bootcamp_affiliate_coupon_code: code)
+    end
+  end
+
+  private
+  delegate :data, to: :user, prefix: true
+
+  memoize
+  def generate_coupon_code
+    promo_code = Stripe::PromotionCode.create(
+      coupon: COUPON_ID,
+      metadata: {
+        user_id: user.id
+      }
+    )
+    promo_code.code
+  end
+
+  COUPON_ID = "NRp5SOVV".freeze
+end

app/commands/user/generate_bootcamp_free_coupon_code.rb

@@ -0,0 +1,35 @@
+class User::GenerateBootcampFreeCouponCode
+  include Mandate
+
+  initialize_with :user
+
+  def call
+    # Easy cheap guard
+    return if user_data.bootcamp_free_coupon_code.present?
+
+    # Now things get expensive with Stripe call and lock below
+    code = generate_coupon_code
+    user_data.with_lock do
+      return if user_data.bootcamp_free_coupon_code.present?
+
+      user_data.update!(bootcamp_free_coupon_code: code)
+    end
+  end
+
+  private
+  delegate :data, to: :user, prefix: true
+
+  memoize
+  def generate_coupon_code
+    promo_code = Stripe::PromotionCode.create(
+      coupon: COUPON_ID,
+      max_redemptions: 1,
+      metadata: {
+        user_id: user.id
+      }
+    )
+    promo_code.code
+  end
+
+  COUPON_ID = "OarhoKrd".freeze
+end

app/controllers/bootcamp_controller.rb

@@ -56,6 +56,7 @@ def stripe_create_checkout_session
     session = Stripe::Checkout::Session.create({
       ui_mode: 'embedded',
       customer_email: @bootcamp_data.email,
+      customer_creation: "always",
       line_items: [{
         price: stripe_price,
         quantity: 1

config/initializers/stripe.rb

@@ -1,3 +1,4 @@
 require 'stripe'
 
 Stripe.api_key = Exercism.secrets.stripe_secret_key
+Stripe.api_version = '2024-10-28.acacia'

db/migrate/20241108083100_add_insider_discounts.rb

@@ -0,0 +1,8 @@
+class AddInsiderDiscounts < ActiveRecord::Migration[7.0]
+  def change
+    return if Rails.env.production?
+
+    add_column :user_data, :bootcamp_affiliate_coupon_code, :string, null: true
+    add_column :user_data, :bootcamp_free_coupon_code, :string, null: true
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2024_11_07_133957) do
+ActiveRecord::Schema[7.0].define(version: 2024_11_08_083100) do
   create_table "active_storage_attachments", charset: "utf8mb4", collation: "utf8mb4_unicode_ci", force: :cascade do |t|
     t.string "name", null: false
     t.string "record_type", null: false
@@ -1390,6 +1390,8 @@
     t.datetime "premium_until"
     t.boolean "trainer", default: false, null: false
     t.integer "seniority", limit: 1
+    t.string "bootcamp_affiliate_coupon_code"
+    t.string "bootcamp_free_coupon_code"
     t.index ["discord_uid"], name: "index_user_data_on_discord_uid", unique: true
     t.index ["first_donated_at", "show_on_supporters_page", "user_id"], name: "index_user_data__supporters-page"
     t.index ["first_donated_at"], name: "index_user_data_on_first_donated_at"

test/models/user/generate_bootcamp_affiliate_coupon_code_test.rb

@@ -0,0 +1,25 @@
+require "test_helper"
+
+class User::GenerateBootcampAffiliateCouponCodeTest < ActiveSupport::TestCase
+  test "creates correctly" do
+    user = create :user
+    code = SecureRandom.hex(6)
+    Stripe::PromotionCode.expects(:create).with(
+      coupon: "NRp5SOVV", metadata: { user_id: user.id }
+    ).returns(OpenStruct.new(code:))
+
+    User::GenerateBootcampAffiliateCouponCode.(user)
+
+    assert_equal code, user.bootcamp_affiliate_coupon_code
+  end
+
+  test "immutable" do
+    code = SecureRandom.hex(6)
+    user = create :user, bootcamp_affiliate_coupon_code: code
+    Stripe::PromotionCode.expects(:create).never
+
+    User::GenerateBootcampAffiliateCouponCode.(user)
+
+    assert_equal code, user.bootcamp_affiliate_coupon_code
+  end
+end

test/models/user/generate_bootcamp_free_coupon_code_test.rb

@@ -0,0 +1,27 @@
+require "test_helper"
+
+class User::GenerateBootcampFreeCouponCodeTest < ActiveSupport::TestCase
+  test "creates correctly" do
+    user = create :user
+    code = SecureRandom.hex(6)
+    Stripe::PromotionCode.expects(:create).with(
+      coupon: "OarhoKrd",
+      max_redemptions: 1,
+      metadata: { user_id: user.id }
+    ).returns(OpenStruct.new(code:))
+
+    User::GenerateBootcampFreeCouponCode.(user)
+
+    assert_equal code, user.bootcamp_free_coupon_code
+  end
+
+  test "immutable" do
+    code = SecureRandom.hex(6)
+    user = create :user, bootcamp_free_coupon_code: code
+    Stripe::PromotionCode.expects(:create).never
+
+    User::GenerateBootcampFreeCouponCode.(user)
+
+    assert_equal code, user.bootcamp_free_coupon_code
+  end
+end