# -*- coding: utf-8 -*-
require "slack"
require "date"

Slack.configure { |config|
  config.token = "token"
}

target_channel = "target_channel"
bot_id = "bot_id"
time_stamp_list = []

groups = Slack.channels_list()["groups"]
groups.each { |group|
  if group["name"] == target_channel then
    messages = Slack.groups_history(channel: group["id"])["messages"]
    messages.each { |message|
      if message["bot_id"] == bot_id then
        ts = message["ts"]
        puts DateTime.strptime(ts, "%s")
        time_stamp_list << ts
       end
    }
  end
}

loop {
  groups = Slack.groups_list()["groups"]
  groups.each { |group|
    if group["name"] == target_channel then
      group_id = group["id"]
      messages = Slack.groups_history(channel: group_id)["messages"]
      messages.each { |message|
        ts = message["ts"]
      	if message["bot_id"] == bot_id and not time_stamp_list.include? ts then
          puts DateTime.strptime(ts, "%s")
          time_stamp_list << ts
          Slack.pins_add(channel: group_id, timestamp: ts)
        end
      }
    end
  }
}