Add parsing method to get the defaults and fix negative issues

1 files changed, 45 insertions, 0 deletions

diff --git a/CLI/ruby/lib/game_of_life.rb b/CLI/ruby/lib/game_of_life.rb
index 879c527..a2ce27a 100644
--- a/CLI/ruby/lib/game_of_life.rb
+++ b/CLI/ruby/lib/game_of_life.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "io/console"
 require "game_of_life/version"
 require "game_of_life/plane"
 require "game_of_life/universe"
@@ -11,6 +12,50 @@ module GameOfLife
   class Error < StandardError; end
 
   class << self
+    # Validate and parse the CLI options and set defaults for the dynamic options.
+    # @param options [Hash] CLI options to generate initial conditions
+    # @option options [String | nil] "input" path to a local file or URL to open
+    # @option options [Numeric | nil] "seed" number to use if no "input" is provided
+    # @option options [Numeric] "width" of the universe
+    # @option options [Numeric] "height" of the universe
+    # @option options [Numeric] "delay" introduced after each cycle
+    # @option options [String] "live-cell" representation
+    # @option options [String] "dead-cell" representation
+    # @smell AbcSize, MethodLenght, Cyclomatic and Perceived Complexity needed for parsing and validating options
+    #   rubocop:disable Metrics/AbcSize
+    #   rubocop:disable Metrics/MethodLength
+    #   rubocop:disable Metrics/CyclomaticComplexity
+    #   rubocop:disable Metrics/PerceivedComplexity
+    # return [Hash] of the parsed options with dynamic defaults based on window size and kernel random
+    def parsed_options(options)
+      max_height = IO.console.winsize[0] - 2
+      max_width  = IO.console.winsize[1]
+
+      if options["delay"].to_i.negative?
+        fail GameOfLife::Error, "Invalid --delay value. must be positive value (sadly this is how time works -so far-)"
+      end
+      if (options["width"]&.< 1) || (options["width"]&.> max_width)
+        fail GameOfLife::Error, "Invalid --width value. " \
+          "must be between 1 and #{max_width} (current terminal width)"
+      end
+      if (options["height"]&.< 1) || (options["height"]&.> max_height)
+        fail GameOfLife::Error, "Invalid --height value. " \
+          "must be between 1 and #{max_height} (current terminal height)"
+      end
+
+      {
+        # Defaults the hight to less then the height of the terminal to allow banner info
+        # and an extra emtpy line to avoid triggering terminal scroll while flushing
+        "height" => max_height,
+        "width" => max_width,
+        "seed" => rand(100_000),
+      }.merge(options)
+    end
+    # rubocop:enable Metrics/AbcSize
+    # rubocop:enable Metrics/MethodLength
+    # rubocop:enable Metrics/CyclomaticComplexity
+    # rubocop:enable Metrics/PerceivedComplexity
+
     # Generate a universe based on the options (from an input file/URI) or using a random/passed seed
     # This method also sets the Classes/Modules constants for the run defining the options for
     # Cell (Dead/Live) state representations, and the delay introduced after rendering each universe/generation