day6.rb

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class Grid

    def initialize(width, height)
        @grid = []
        height.times do |l|
            line = []
            width.times do |w|
                line << false
            end
            @grid << line
        end
    end
    
    def process(instruction)
        if (instruction.match(/turn on/))
            type = :on 
        elsif (instruction.match(/turn off/))
            type = :off
        elsif (instruction.match(/toggle/)) 
            type = :toggle 
        end
        match = instruction.match(/(\d+),(\d+) through (\d+),(\d+)/)
        whole, start_x, start_y, end_x, end_y = match.to_a.map{|v|v.to_i}
        for y in start_y..end_y
            for x in start_x..end_x
                if (type == :on)
                    @grid[y][x] = true
                elsif (type == :off)
                    @grid[y][x] = false
                elsif(type == :toggle)
                    current = @grid[y][x]
                    @grid[y][x] = !current
                end
            end
        end
        self
    end

    def lights_on
        @grid.map{|r|r.count{|v|v== true}}.inject(:+)
    end
    
end

grid = Grid.new(1000, 1000)
input.lines.each do |l|
    grid.process(l.strip)
end
puts grid.lights_on

# input = "turn on 0,0 through 999,999"
# puts input
# puts Grid.new(1000, 1000).process(input).lights_on

# input = "toggle 0,0 through 999,0"
# puts input
# puts Grid.new(1000, 1000).process(input).lights_on

# input = "turn off 499,499 through 500,500"
# puts input
# puts Grid.new(1000, 1000).process(input).lights_on