state_info_bonus.rb

@states = Hash.new { |h, k| h[k][1] = []}

@states = {
  OR: ['Oregon', ['Portland', 'Jacksonville']],
  FL: ['Florida', ['Miami']],
  CA: ['California', ['San Jose', 'San Francisco', 'Monterrey']],
  NY: ['New York', ['New York City', 'Long Island']],
  MI: ['Michigan', ['Detroit']]
}

# Task 1: add 2 additional states after definition

@states[:AK] = ['Alaska', ['Sitka', 'Juneau']]
@states[:CO] = ['Colorado', ['Utah']]

# Task 2: new hash cities with arrays of cities as values

# @cities = {
#   OR: ['Portland', 'Jacksonville'],
#   CA: ['San Jose', 'San Francisco', 'Monterrey'],
#   CO: ['Utah']
# }

# Task 3: new method describing states

def describe_state(state_code)
  state_code = state_code.intern
  if @states.has_key?(state_code)
    "#{state_code} is for #{@states[state_code][0]}. It has #{@states[state_code][1].size} major cities: #{@states[state_code][1].join(", ")}"
  else
    puts "Can't find #{state_code}"
  end
end

# Task 4: new hash for defining taxes

@taxes = {
  OR: 0,
  FL: 6,
  CA: 7.5,
  NY: 4,
  MI: 6
}

# Task 5: new method calculating tax

def calculate_tax(state_code, amount)
  state_code = state_code.intern
  if @states.has_key?(state_code)
    amount = amount.to_f
    tax = amount * @taxes[state_code] / 100
  else
    puts "Can't find #{state_code}"
  end
end

# Task 6: new method find_state_for_city

def find_state_for_city(city_name)
  # Filtering hash to keep only key-value pairs where city name is found in value (array)
  state_name = @states.select {|k, v| v[1].include?(city_name)}
  state_name.keys
end

# Output hashes for inspection
puts @states.inspect
puts @cities.inspect
puts "\n"

# Testing describe_state method

puts describe_state('HI')
puts describe_state('AK')
puts describe_state('OR')
puts "\n"

# Testing calculate_tax method

puts calculate_tax('OR', 100)
puts calculate_tax('CA', 100)
puts calculate_tax('CA', 200.75)
puts calculate_tax('AB', 200)
puts "\n"

# Testing find_state_for_city method

puts find_state_for_city('Utah')
puts find_state_for_city('Portland')
puts find_state_for_city('San Jose')