require "twitter"
require 'rmagick'

### 設定ここから ###
# SSL証明書へのパス
ENV["SSL_CERT_FILE"] = "SSL証明書へのパスを記載"

# 自身のTwitterID
MY_TWITTER_ID = "Twitter IDを記載"

# 各種Token/Secret
CONSUMER_KEY         = "メモしたCONSUMER_KEYを記載" 
CONSUMER_SECRET      = "メモしたCONSUMER_SECRETを記載"
ACCESS_TOKEN        = "メモしたACCESS_TOKENを記載" 
ACCESS_TOKEN_SECRET = "メモしたACCESS_TOKEN_SECRETを記載"

### 設定ここまで ###

class TwitterClient
  NUMBER_OF_COL = 5 
  NUMBER_OF_ROW = 5 
  DEFAULT_FILE_NAME = "bingo.jpg"

  def initialize(consumer_key, consumer_secret, access_token, access_token_secret, my_twitter_id)
    @client = Twitter::REST::Client.new do |config|
      config.consumer_key        = consumer_key
      config.consumer_secret     = consumer_secret
      config.access_token        = access_token
      config.access_token_secret = access_token_secret
    end
    @my_twitter_id = my_twitter_id
    @number_of_followers = @client.user(@my_twitter_id).followers_count
  end

  def choice_followers(count)
    puts "Error: Number of follower is less than #{count}." if @number_of_followers < count 
    @chosen_followers_indexes = []
    index = -1
    count.times do
      loop do
        index = rand(@number_of_followers)
        break if !@chosen_followers_indexes.include?(index)
      end
      @chosen_followers_indexes << index
    end
    @chosen_followers_indexes
  end

  def get_followers
    is_success = false
    @chosen_follower_ids = []
    @client.follower_ids(@my_twitter_id).each_with_index do |follower, index|
      @chosen_follower_ids << follower if @chosen_followers_indexes.include?(index)

      # 全員見つかった 
      if @chosen_follower_ids.size >= @chosen_followers_indexes.size
        is_success = true
        break
      end
    end
    is_success
  end

  def generate_image(output_name = DEFAULT_FILE_NAME)
    image_urls = []
    names = []
    @chosen_follower_ids.each_with_index do |follower_id, index|
      user = @client.user(follower_id)
      puts user.name
      puts user.profile_image_uri

      image_urls << user.profile_image_uri
      names << user.name
    end

    # 真ん中に自分の画像を差し込む
    image_urls.insert((NUMBER_OF_COL * NUMBER_OF_ROW) / 2, @client.user(@my_twitter_id).profile_image_url)
    names.insert((NUMBER_OF_COL * NUMBER_OF_ROW) / 2, "★")

    # 対象者名をテキストに出力
    File.open(output_name + "_names.txt", "w") do |text|
      names.each_with_index do |name, index| 
        text.write(name)
        if (index + 1)  % NUMBER_OF_COL == 0
          text.write("\n") # 改行
        else
          text.write(" | ")
        end
      end
    end

    # 1行分の画像を行の数だけ生成
    images = []
    NUMBER_OF_ROW.times do |row_index|
      image = Magick::ImageList.new
      NUMBER_OF_COL.times do |col_index|
        image.read(image_urls[row_index * NUMBER_OF_COL + col_index])
      end
      image = image.append(false)
      images << image
    end

    # 行毎の画像を結合
    joined_image = Magick::ImageList.new
    images.each_with_index do |image, index|
      joined_image.from_blob(image.to_blob)
    end
    joined_image = joined_image.append(true) 
    joined_image.write(output_name) 
  end
end

client = TwitterClient.new(CONSUMER_KEY, CONSUMER_SECRET, ACCESS_TOKEN, ACCESS_TOKEN_SECRET, MY_TWITTER_ID)

3.times do
  client.choice_followers(TwitterClient::NUMBER_OF_COL * TwitterClient::NUMBER_OF_ROW - 1)
  break if client.get_followers

  # フォロワー数の減少により、chosen_indexesの値がindexを超えてしまったら、再抽選
  puts "retrying..."
end
client.generate_image

$ chmod +x make_follower_bingo.rb 

$ ruby make_follower_bingo.rb