From e55e883718d4ef025171d25a3e31c84e3175d6fc Mon Sep 17 00:00:00 2001
From: Nat Lasseter <user@4574.co.uk>
Date: Sun, 5 May 2024 12:29:26 +0100
Subject: Initial Commit

---
 01-hub2.rb        | 28 +++++++++++++++++++++++
 forward-please.rb | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 frame.rb          | 14 ++++++++++++
 level.rb          | 23 +++++++++++++++++++
 4 files changed, 132 insertions(+)
 create mode 100644 01-hub2.rb
 create mode 100644 forward-please.rb
 create mode 100644 frame.rb
 create mode 100644 level.rb

diff --git a/01-hub2.rb b/01-hub2.rb
new file mode 100644
index 0000000..4ed0f6b
--- /dev/null
+++ b/01-hub2.rb
@@ -0,0 +1,28 @@
+require './level'
+require './frame'
+
+class L1_Hub2 < Level
+  interfaces %w(1 2)
+  description <<~EOD
+    You are a two-port hub. Your job is to forward frames from one interface to the other.
+  EOD
+
+  def self.target(frame)
+    case frame.iface
+    when 1
+      [frame.to(2)]
+    when 2
+      [frame.to(1)]
+    end
+  end
+
+  def self.generate
+    frames = {}
+    @@interfaces.each do |iface|
+      next if rand < 0.4
+      frames[@@count.to_s] = Frame.new(iface, "Frame #{@@count}")
+      @@count += 1
+    end
+    frames
+  end
+end
diff --git a/forward-please.rb b/forward-please.rb
new file mode 100644
index 0000000..fc36a6e
--- /dev/null
+++ b/forward-please.rb
@@ -0,0 +1,67 @@
+require './01-hub2.rb'
+
+$level = L1_Hub2
+
+puts $level.description
+
+def help
+  puts <<~EOF
+    Commands:
+      f {frame} {iface}: forward a frame to iface
+      h: this help
+      c: click on
+      d: show the level description
+      i: show the interfaces
+      a: show the click frames and actions
+      q: quit
+  EOF
+end
+
+$instructions = []
+
+def forward(frame, iface)
+  $instructions << [frame, $clickframes[frame].to(iface)]
+end
+
+def clickactions
+  puts "Frames:"
+  $clickframes.each do |i, frame|
+    puts "  #{i}: Interface #{frame.iface} -> #{frame.description}"
+  end
+
+  l = 1
+  puts "Actions:"
+  $instructions.each do |instr|
+    puts "  #{l}: Forward frame #{instr[0]} to interface #{instr[1].iface}"
+  end
+end
+
+def click
+end
+
+def handle(cmd)
+  case cmd[0]
+  when ?h
+    help
+  when ?f
+    forward(*cmd.split[1..])
+  when ?d
+    puts $level.description
+  when ?i
+    puts $level.interfaces
+  when ?a
+    clickactions
+  when ?c
+    click
+  when :q
+    exit 0
+  end
+end
+
+$clickframes = $level.generate
+pp $clickframes
+
+loop do
+  print ">: "
+  handle(gets.strip)
+end
diff --git a/frame.rb b/frame.rb
new file mode 100644
index 0000000..70216c8
--- /dev/null
+++ b/frame.rb
@@ -0,0 +1,14 @@
+class Frame
+  def initialize(iface, desc)
+    @iface = iface
+    @description = desc
+  end
+
+  attr_accessor :iface, :description
+
+  def to(iface)
+    t = dup
+    t.iface = iface
+    t
+  end
+end
diff --git a/level.rb b/level.rb
new file mode 100644
index 0000000..21ebc61
--- /dev/null
+++ b/level.rb
@@ -0,0 +1,23 @@
+class Level
+  @@interfaces = []
+  @@description = ""
+  @@count = 0
+
+  attr_accessor :description
+
+  def self.interfaces(arr = nil)
+    if arr.nil?
+      (["Interfaces:"] + @@interfaces).join("\n  ")
+    else
+      @@interfaces = arr
+    end
+  end
+
+  def self.description(desc = nil)
+    if desc.nil?
+      @@description
+    else
+      @@description = desc
+    end
+  end
+end
-- 
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