require 'slack-notifier'

notifier = Slack::Notifier.new "WEBHOOK_URL"
notifier.ping "Hello World"
# => if your webhook is setup, will message "Hello World"
# => to the default channel you set in slack

gem "slack-notifier"

notifier = Slack::Notifier.new "WEBHOOK_URL" do
  defaults channel: "#default",
           username: "notifier"
end

notifier.ping "Hello default"
# => will message "Hello default"
# => to the "#default" channel as 'notifier'

notifier = Slack::Notifier.new "WEBHOOK_URL", channel: "#default",
                                              username: "notifier"

notifier.ping "Hello random", channel: "#random"
# => will ping the "#random" channel

message = "Hello world, [check](http://example.com) it <a href='http://example.com'>out</a>"
Slack::Notifier::Util::LinkFormatter.format(message)
# => "Hello world, <http://example.com|check> it <http://example.com|out>"

message = "<!channel> hey check this out"
notifier.ping message

#ends up posting "@channel hey check this out" in your Slack channel

link_text = Slack::Notifier::Util::Escape.html("User <user@example.com>")
message = "Write to [#{link_text}](mailto:user@example.com)"
notifier.ping message

blocks = [
  {
    "type": "image",
    "title": {
      "type": "plain_text",
      "text": "image1",
      "emoji": true
    },
    "image_url": "https://api.slack.com/img/blocks/bkb_template_images/onboardingComplex.jpg",
    "alt_text": "image1"
  },
  {
    "type": "section",
    "text": {
      "type": "mrkdwn",
      "text": "Hey there 👋 I'm TaskBot. I'm here to help you create and manage tasks in Slack.\nThere are two ways to quickly create tasks:"
    }
  }
]

notifier.post(blocks: blocks)

notifier.post text: "feeling spooky", icon_emoji: ":ghost:"
# or
notifier.post text: "feeling chimpy", icon_url: "http://static.mailchimp.com/web/favicon.png"

a_ok_note = {
  fallback: "Everything looks peachy",
  text: "Everything looks peachy",
  color: "good"
}
notifier.post text: "with an attachment", attachments: [a_ok_note]

notifier = Slack::Notifier.new 'WEBHOOK_URL', http_options: { open_timeout: 5 }
notifier.post text: "hello", http_options: { open_timeout: 10 }

notifier = Slack::Notifier.new 'WEBHOOK_URL', http_options: {
                                                              proxy_address:  'localhost',
                                                              proxy_port:     3128,
                                                              proxy_from_env: false
                                                            }

module Client
  def self.post uri, params={}
    Net::HTTP.post_form uri, params
  end
end

notifier = Slack::Notifier.new 'WEBHOOK_URL' do
  http_client Client
end

notifier.post text: "hello", http_client: CustomClient

class NoOpHTTPClient
  def self.post uri, params={}
    # bonus, you could log or observe posted params here
  end
end

notifier = Slack::Notifier.new 'WEBHOOK_URL' do
  http_client NoOpHTTPClient
end

notifier = Slack::Notifier.new "WEBHOOK_URL" do
  middleware format_message: { formats: [:html] }
end
# this example will *only* use the format_message middleware and only format :html links

notifier.post text: "Hello <a href='http://example.com'>world</a>! [visit this](http://example.com)"
# => will post "Hello <http://example.com|world>! [visit this](http://example.com)"

notifier = Slack::Notifier.new "WEBHOOK_URL" do
  middleware :format_message, :format_attachments
end
# will run format_message then format_attachments with default options

notifier = Slack::Notifier.new "WEBHOOK_URL" do
  middleware format_message: { formats: [:html] },
             format_attachments: { formats: [:markdown] }
end
# will run format_message w/ formats [:html] then format_attachments with formats [:markdown]

notifier.post text: "hello", at: :casper
# => "<@casper> hello"

notifier.post text: "hello", at: [:here, :waldo]
# => "<!here> <@waldo> hello"

notifier.post text: "hello", channel: ["default", "all_the_things"]
# => will post "hello" to the default and all_the_things channel

class SwapWords < Slack::Notifier::PayloadMiddleware::Base
  middleware_name :swap_words # this is the key we use when setting
                              # the middleware stack for a notifier

  options pairs: ["hipchat" => "slack"] # the options takes a hash that will
                                        # serve as the default if not given any
                                        # when initialized

  def call payload={}
    return payload unless payload[:text] # noope if there is no message to work on

    # not efficient, but it's an example :)
    options[:pairs].each do |from, to|
      payload[:text] = payload[:text].gsub from, to
    end

    payload # always return the payload from your middleware
  end
end


notifier = Slack::Notifier.new "WEBHOOK_URL" do
  middleware :swap_words # setting our stack w/ just defaults
end
notifier.ping "hipchat is awesome!"
# => pings slack with "slack is awesome!"

notifier = Slack::Notifier.new "WEBHOOK_URL" do
  # here we set new options for the middleware
  middleware swap_words: { pairs: ["hipchat" => "slack",
                                   "awesome" => "really awesome"]}
end

notifier.ping "hipchat is awesome!"
# => pings slack with "slack is really awesome!"

class MultiChannel < Slack::Notifier::PayloadMiddleware::Base
  middleware_name :channels

  def call payload={}
    return payload unless payload[:channel].respond_to?(:to_ary)

    payload[:channel].to_ary.map do |channel|
      pld = payload.dup
      pld[:channel] = channel
      pld
    end
  end
end