watch tv

tv-remote.rb

@low_channel = 1 # lowest channel
@high_channel = 10 # highest channel
@blocked = [2, 6, 8] # blocked channels
@channels_to_visit = [9,1,2,3,9] #channels to watch

flash = 0
click1 = 0
click2 = 0
click3 = 0
click4 = 0
current_channel = 0
@channels = (@low_channel..@high_channel).to_a 
@allowed_chn = @channels - @blocked
@pos = 0

def flash(ch)
  if @channels_to_visit.index(ch) > 0
    flash = @channels_to_visit[@pos]
    @pos = @pos + 1
  elsif @channels_to_visit.index(ch) > 1
    flash = @channels_to_visit[@pos]
    @pos = @pos + 1
  else
    flash = @channels_to_visit[@pos]
  end
  return flash
end

def next_route(current_channel)
  next_range = @allowed_chn
  while next_range.first != current_channel do
    next_range = next_range.push(next_range.shift)
  end
  return next_range
end

def prev_route(current_channel)
  allowed_chn = [1,3,4,5,7,9,10]
  prev_range = @allowed_chn.reverse
  while prev_range.first != current_channel do
    prev_range = prev_range.push(prev_range.shift)
  end
  return prev_range
end

def flash_up(ch, flash)
  rflash_range = @allowed_chn
  while rflash_range.first != flash do
    rflash_range = rflash_range.push(rflash_range.shift)
  end
  return rflash_range
end

def flash_down(ch, flash)
  lflash_range = @allowed_chn.reverse
  
  while lflash_range.first != flash do
    lflash_range = lflash_range.push(lflash_range.shift)
  end
  return lflash_range
end

def lowest_clicks(a, b, c, d, e)
  arr = [a, b, c, d]
  arr = arr.compact
  best = arr[0]
  arr.each do |i|
    next if i==0
    if i < best
      best = i
    end
  end
  return best
end

@channels_to_visit.each do |ch|
  
  dummy = 0
  if !@allowed_chn.include?(ch)
    puts "Sorry channel #{ch} is blocked!"
    next
  elsif @channels_to_visit.index(ch) == 0 && dummy == 0
    
    next_range = (current_channel..@allowed_chn.last).to_a
    prev_range = prev_route(ch)
    lflash_range = flash_down(ch, flash) if flash > 0
    rflash_range = flash_up(ch, flash) if flash > 0
    
    click = ch.to_s.split("").size
    current_channel = ch
    # puts "#{click} click for channel #{ch}"
  else
    dummy = 2
    next_range = next_route(current_channel)
    prev_range = prev_route(current_channel)
    lflash_range = flash_down(ch, flash) if flash > 0
    rflash_range = flash_up(ch, flash) if flash > 0
    
    if next_range.include?(ch)
      if next_range.index(ch) > next_range.index(current_channel)
        click1 = (next_range.index(ch) + 1) - (next_range.index(current_channel) + 1)
      else
        click1 = (next_range.index(current_channel) + 1) - (next_range.index(ch) + 1)
      end
      # puts "#{click1} clicks for channel #{ch}"
    end
    if prev_range.include?(ch)
      if prev_range.index(ch) > prev_range.index(current_channel)
        click2 = (prev_range.index(ch) + 1) - (prev_range.index(current_channel) + 1)
      else
        click2 = (prev_range.index(current_channel) + 1) - (prev_range.index(ch) + 1)
      end
      # puts "#{click2} clicks for channel #{ch}"
    end
    if lflash_range && lflash_range.include?(ch)
      if lflash_range.index(ch) > lflash_range.index(lflash_range.first)
        click3 = (lflash_range.index(ch) + 1) - (lflash_range.index(lflash_range.first) + 1)
      else
        click3 = (lflash_range.index(lflash_range.first) + 1) - (lflash_range.index(ch) + 1)
      end
      click3 = click3 + 1 # 1 count for flash button
      # puts "#{click3} clicks for channel #{ch}"
    end
    if rflash_range && rflash_range.include?(ch)
      if rflash_range.index(ch) > rflash_range.index(rflash_range.first)
        click4 = (rflash_range.index(ch) + 1) - (rflash_range.index(rflash_range.first) + 1)
      else
        click4 = (rflash_range.index(rflash_range.first) + 1) - (rflash_range.index(ch) + 1)
      end
      click4 = click4 + 1 # 1 count for flash button
      # puts "#{click4} clicks for channel #{ch}"
    end
  
    current_channel = ch
  end
  flash = flash(ch) #store channel in flash
  click_arr = [click, click1, click2, click3, click4]
  best_click = lowest_clicks(click, click1, click2, click3, click4)
  puts "Lowest clicks to reach channel #{ch} is #{best_click}"

end
#print "total clicks while watching"