From a8ff6c970b10d16c3664d52774db169ce8636451 Mon Sep 17 00:00:00 2001
From: Monalisa Chatterjee <usermonalisa@gmail.com>
Date: Mon, 12 Feb 2018 07:11:26 -0800
Subject: [PATCH] Solar System Wave 1 , Wave 2 and Wave 3

---
 solar_system.rb | 125 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 solar_system.rb

diff --git a/solar_system.rb b/solar_system.rb
new file mode 100644
index 00000000..20949f36
--- /dev/null
+++ b/solar_system.rb
@@ -0,0 +1,125 @@
+# Display color string
+require 'colorize'
+# Solar system class
+class SolarSystem
+  # reader, writer methods
+  attr_accessor :planets, :age
+
+# Constructor
+  def initialize planets, age = 5000000000
+    @planets = planets
+    @age = age
+  end
+
+# Adds planet
+  def add_planet planet
+    @planets.push(planet)
+  end
+
+# Returns a list of planets
+  def list_of_planets
+    list = []
+    @planets.length.times do |index|
+      list << "#{index+1}. #{@planets[index].name}"
+    end
+    return list
+  end
+end
+
+class Planet
+  attr_reader :name, :year_length, :distance_from_the_sun, :mass, :diameter, :atmospheric_components
+
+  def initialize name, year, distance, mass, diameter, components
+    @name = name
+    @year_length = year
+    @distance_from_the_sun = distance
+    @mass = mass
+    @diameter = diameter
+    @atmospheric_components = components
+  end
+
+ # Display planet info in bold.
+  def print_planet_info
+    puts "☛ Planet #{@name} takes #{@year_length} earth days to go around its star.✰".bold
+    puts ""
+    puts "◆ It is #{@distance_from_the_sun} kilometers away from the sun ☀️ and has a mass of #{@mass} kilogram.".bold
+    puts ""
+    puts "◆ It's diameter is #{@diameter} kilometer and it has these atmospheric components: #{@atmospheric_components}.".bold
+    puts ""
+  end
+
+# Calculate distance of the planet from other planet
+  def distance_from_the_planet other_planet
+    return (@distance_from_the_sun - other_planet.distance_from_the_sun).abs.round(2)
+  end
+end
+
+# Ask user input for new planet variables and adds a new planet to solar system.
+def add_new_planet our_solar_system
+  puts "Please enter the planet name"
+  planet_name = gets.chomp.capitalize
+  print "Please enter the length of time the planet takes to go around its star in earth days. ➤ "
+  year_length = gets.chomp.to_f.round(2)
+  print "Please enter how far is the planet from the sun in kilometers. ➤ "
+  distance_from_the_sun = gets.chomp.to_f.round(2)
+  print "Please enter the mass of a planet in kilograms. ➤ "
+  mass = gets.chomp
+  print "Please enter a diameter of the planet in kilometers. ➤ "
+  diameter = gets.chomp.to_f.round(2)
+  print "Please enter what is the composition of the atmosphere. ➤ "
+  atmospheric_components = gets.chomp
+
+  new_planet = Planet.new(planet_name, year_length, distance_from_the_sun, mass, diameter, atmospheric_components)
+  our_solar_system.add_planet(new_planet)
+  puts "New planet #{planet_name} is added.".red
+end
+
+# Ask user to choose a planet and based on that prints info.
+def show_planets our_solar_system
+  all_planets = our_solar_system.planets
+  puts "Choose which planet:"
+  all_planets.length.times do |index|
+    puts "#{index+1}: #{all_planets[index].name}"
+  end
+  puts "Which planet info you want"
+  planet_choice = gets.chomp.to_i
+  if planet_choice >=1 && planet_choice <= all_planets.length
+    # Display all the planet objects in array.
+    puts all_planets[planet_choice - 1].print_planet_info
+    # Local variable which is assigned the planet that is selected
+    choosen_planet = all_planets[planet_choice -1]
+    all_planets.length.times do |index|
+      # Skips the selected planet
+      if planet_choice - 1 != index
+        # Output the distance from other planet.
+        puts "✹ The distance from #{all_planets[index].name} is #{choosen_planet.distance_from_the_planet(all_planets[index])} km.".bold
+        puts ""
+      end
+    end
+  end
+end
+
+planets_hash = [{ name: "Mercury", year_length: 87.97, distance_from_the_sun: 57909175, mass: "3.3 x 1023", diameter: 4879.4, atmospheric_components: "trace amounts of hydrogen and helium" }, { name: "Venus", year_length: 224.7, distance_from_the_sun: 108208930, mass: "4.87 x 1024", diameter: 12104, atmospheric_components: "96% carbon dioxide, 3% nitrogen, 0.1% water vapor" }, { name: "Earth 🌏", year_length: 365.26, distance_from_the_sun: 149597890, mass: "5.98 x 1024", diameter: "12756", atmospheric_components: "78% nitrogen, 21% oxygen, 1% argon" }, { name: "Mars", year_length: 686.98, distance_from_the_sun: 227936640, mass: "6.42 x 1023Kg", diameter: 6787, atmospheric_components: "95% carbon dioxide, 3% nitrogen, 1.6% argon" }, { name: "Jupiter", year_length: 4332.82, distance_from_the_sun: 778412020, mass: "1.90 x 1027", diameter: 142800, atmospheric_components: "90% hydrogen,10% helium, .07% methane" }]
+
+# loops through planets_hash and push all planet object in an array.
+array_planets = []
+planets_hash.each do |planet_detail|
+  planet_instance = Planet.new(planet_detail[:name], planet_detail[:year_length], planet_detail[:distance_from_the_sun], planet_detail[:mass], planet_detail[:diameter], planet_detail[:atmospheric_components])
+  array_planets << planet_instance
+end
+
+# Creates a new instance of solar system.
+our_solar_system = SolarSystem.new array_planets
+puts "☽ ★ Welcome to Solar System. Our solar is system is 4.6 billion years old.❤︎".bold
+puts "Enter 0 to add a planet and 1 to view planet info and 2 to exit."
+
+until (choice = gets.chomp) == "2"
+  if choice =~ /^[0-2]$/
+    if choice == "0"
+      add_new_planet our_solar_system
+    else
+      show_planets our_solar_system
+    end
+  end
+  puts "Enter 0 to add a planet and 1 to view planet info and 2 to exit."
+end