Add lessons

ika.rb

@@ -1,17 +1,27 @@
  require 'discordrb'
  require_relative './session'
+ require_relative './lesson'
 
  token = File.read("./token")
 
  bot = Discordrb::Bot.new(token:)
 
  current_session = nil
+ current_lesson = Lesson.new
 
  bot.message do |event|
    if event.message.content == "!init"
      next event.respond("There's already a session running") unless current_session.nil?
 
      next current_session = Session.new(event, event.message.author)
+   elsif event.message.content == "!lesson"
+     next event.respond("There's already a lesson running") if current_lesson.running?
+     event.respond("Starting a lesson now!")
+     next current_lesson.start!(event.channel)
+   elsif event.message.content == "!stoplesson"
+     next event.respond("There's no lesson running") unless current_lesson.running?
+     event.respond("Ending the current lesson!")
+     next current_lesson.stop!
    end
 
    current_session&.respond_to event

lesson.rb

@@ -0,0 +1,38 @@
+DEFAULT_LESSON_PLAN = [
+  [15, "login and catch up on the week"],
+  [45, "review chapter vocab and grammar"],
+  [15, "answer Seth Clydesdale Genki review questions"],
+  [15, "ask closing questions and have Japanese conversation"],
+]
+
+class Lesson
+  attr_reader :lesson_plan, :channel, :thread, :running
+
+  def initialize(lesson_plan=DEFAULT_LESSON_PLAN)
+    @lesson_plan = lesson_plan
+    @running = false
+  end
+
+  def stop!
+    thread.kill if thread
+    @running = false
+  end
+
+  def start!(channel)
+    stop!
+    @channel = channel
+    @thread = Thread.new do
+      @running = true
+      lesson_plan.each do |time, message|
+        channel.send_message "#{time} minutes to #{message}"
+        sleep(time * 60)
+      end
+      channel.send_message "Lesson over!"
+      @running = false
+    end
+  end
+
+  def running?
+    running
+  end
+end