require "carbon"

# You can setup defaults in this class
abstract class BaseEmail < Carbon::Email
  # For example, set up a default 'from' address
  from Carbon::Address.new("My App Name", "support@myapp.com")
  # Use a string if you just need the email address
  from "support@myapp.com"
end

BaseEmail.configure do |settings|
  settings.adapter = Carbon::DevAdapter.new(print_emails: true)
end

# Create an email class
class WelcomeEmail < BaseEmail
  def initialize(@name : String, @email_address : String)
  end

  to @email_address
  subject "Welcome, #{@name}!"
  header "My-Custom-Header", "header-value"
  reply_to "no-reply@noreply.com"
  # You can also do just `text` or `html` if you don't want both
  templates text, html
end

abstract class BaseEmail < Carbon::Email
  macro inherited
    from default_from
    layout :application_layout
  end
end

# Define your new delayed strategy
class SendEmailInJobStrategy < Carbon::DeliverLaterStrategy

  # `block.call` will run `deliver`, but you can call
  # `deliver` yourself on the `email` when you need.
  def run(email : Carbon::Email, &block)
    EmailJob.perform_later(email)
  end
end

class EmailJob < JobProcessor
  def perform(email : Carbon::Email)
    email.deliver
  end
end

# configure to use your new delayed strategy
BaseEmail.configure do |settings|
  settings.deliver_later_strategy = SendEmailInJobStrategy.new
end

# In spec/spec_helper.cr or wherever you configure your code
BaseEmail.configure do
  # This adapter will capture all emails in memory
  settings.adapter = Carbon::DevAdapter.new
end

# In spec/spec_helper.cr

# This gives you the `be_delivered` expectation
include Carbon::Expectations

Spec.before_each do
  Carbon::DevAdapter.reset
end

# Let's say we have a class that signs the user up and sends the welcome email
# that was described at the beginning of the README
class SignUpUser
  def initialize(@name : String, @email_address : String)
  end

  def run
    sign_user_up
    WelcomeEmail.new(name: @name, email_address: @email_address).deliver
  end
end

it "sends an email after the user signs up" do
  SignUpUser.new(name: "Emily", email_address: "em@gmail.com").run

  # Test that this email was sent
  WelcomeEmail.new(name: "Emily", email_address: "em@gmail.com").should be_delivered
end

# or we can just check that some emails were sent
it "sends some emails" do
  SignUpUser.new(name: "Emily", email_address: "em@gmail.com").run

  Carbon.should have_delivered_emails
end

it "builds a nice welcome email" do
  email = WelcomeEmail.new(name: "David", email_address: "david@gmail.com")
  # Note that recipients are converted to an array of Carbon::Address
  # So if you use a string value for the `to` field, you'll get an array of
  # Carbon::Address instead.
  email.to.should eq [Carbon::Address.new("david@gmail.com")]
  email.text_body.should contain "Welcome"
  email.html_body.should contain "Welcome"
end