#!/usr/bin/ruby -Ku

require 'open-uri'

img_width = 0
img_height = 0
img_data = [] # [h][w] で [r,g,b]がでてくるようにする
open('http://www.tepco.co.jp/forecast/html/images/juyo-j.gif'){|file|
  IO::popen('giftopnm', 'r+'){|io|
    io.write file.read
    raise 'Unknown format!' if /^P6/ !~ io.readline
    raise 'Unknown size!' if /(\d+) (\d+)/ !~ io.readline
    img_width, img_height = [$1.to_i, $2.to_i]
    $stderr.puts "Original image w, h: #{img_width}, #{img_height}"
    img_height.times{|i|
      same_row_data = []
      img_width.times{|j|
        same_row_data << [io.getc, io.getc, io.getc]
      }
      img_data << same_row_data
    }
  }
}

converted_data = {}

# 画像から情報を読み取る
# 0時(Y = 69), 23時(Y = 573)
hr = 0
(69.0).step(573, (573 - 69).to_f / 23){|f|
  i = f.to_i
  #$stderr.puts "#{hr}時台(Y = #{i}) : #{img_data[275][i].inspect}"

  same_hr_info = {}

  status = :waiting
  # 計画停電なし(水), あり(オレンジ), まだ(黄) # X = 275のデータを元に
  if img_data[275][i][0] > 0xC0 && img_data[275][i][1] < 0x60 && img_data[275][i][2] > 0xC0 then
    # 255, 64, 255
    status = :not_operated
  elsif img_data[275][i][0] < 0x20 && img_data[275][i][1] > 0xC0 \
      && img_data[275][i][2] < 0xA0 && img_data[275][i][2] > 0x60 then
    # 0, 255, 128
    status = :operated
  else
    # 191, 255, 255
  end
  same_hr_info[:status] = status

  # 万kWを読み込む (Y => 0: 286, 6000: 55)
  consumption = 0
  if status != :waiting then
    # 上に見ていって色がかわる画素を探す
    275.step(56, -1){|j|
      if (img_data[j][i] == [0, 0, 0]) \
          or (img_data[j][i][0] > 0xB0 && img_data[j][i][1] > 0xE0 && img_data[j][i][2] > 0xE0) then
        consumption = ((286 - j).to_f / (286 - 55) * 6000).to_i
        break
      end
    }
  end
  same_hr_info[:consumption] = consumption

  converted_data[hr] = same_hr_info
  hr += 1
}

converted_data.to_a.sort{|a, b| a[0] <=> b[0]}.each{|i, info|
  $stderr.puts "#{i}: #{info.inspect}"
}