class CronController < ApplicationController

    # slack channel hook
    $slackHook ="https://hooks.slack.com/services/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"
    $discourseHost = 'community.cloudways.com/';
    $messageText ="New Notification";

    # import http module
    require 'net/http'

=begin
    A method which build connection with postgreSQL and fetch last 24hr records
=end

    def slackNotification
        logger.debug"*******Cron Started********"
        begin
            $query ="SELECT users.username AS username, topics.title AS topic_title, topics.id AS topic_id, posts.raw AS raw FROM post_replies
                JOIN posts ON posts.id = post_replies.post_id
                JOIN users ON users.id = posts.user_id
                JOIN topics ON topics.user_id = users.id
                WHERE post_replies.created_at BETWEEN current_date AND current_date - INTERVAL '1' DAY;"
            $res = ActiveRecord::Base.connection.exec_query(query);

            # iteration on each record
            $res.each do |row|
                sendNotifications row
            end

            logger.debug"*******Cron successfully executed.********"
            render :json => {:status =>"true", :message =>"Cron successfully executed."}

        rescue Exception => e
            logger.fatal"Exception: #{e}"
        end
    end

=begin
    such method which take payload and send it to slack hook url
    @params row
=end
    def sendNotifications row
        $title = row['topic_title']
        $topicId = row['topic_id']
        $content = row['raw']
        begin
            uri = URI.parse($slackHook)
            # Full control
            http = Net::HTTP.new(uri.host, uri.port)
            response = Net::HTTP.post_form(uri, {
                'payload' => '{
                   "fallback":"#{$messageText}",
                   "text":"#{$title}",
                   "pretext":"<http://#{$discourseHost}|#{$title}>",
                   "color":"#36a64f",
                   "fields": [
                        {
                           "title":"#{$title}" ,
                           "value":"#{$content}",
                           "short": false
                        }
                    ]
                }'
            })
        rescue Exception => e
            logger.fatal" Attributes: title: #{$title}, topicId: #{$topicId}, content: #{$content}, URL: <http://#{$discourseHost}|#{$title}>"
            logger.fatal"Exception: #{e}"
        end
    end
end