#!/opt/gitlab/embedded/bin/ruby --disable-gems
# Fix the PATH so that gitlab-shell can find git-upload-pack and friends.
ENV['PATH'] = '/opt/gitlab/bin:/opt/gitlab/embedded/bin:' + ENV['PATH']

require 'net/http'
require 'json'
require 'cgi'

###################
# General variables
###################
refs = $stdin.read
key_id = ENV.delete('GL_ID')
proto = $stdin
protocol = ENV.delete('GL_PROTOCOL')
repo_path = Dir.pwd
gl_repository = ENV['GL_REPOSITORY']

# Read given hashes
hash = refs.split(' ')
hash_from = hash[0]
hash_to = hash[1]
@branch = hash[2]

#################
# Colorize output
#################
class String
    def red;            "\033[31m#{self}\033[0m" end
    def green;          "\033[32m#{self}\033[0m" end
    def blue;           "\033[34m#{self}\033[0m" end
end

##########################
# Pull a Chuck Norris Joke
##########################
def get_joke(author = '')
    begin
        plain_uri = 'http://api.icndb.com/jokes/random'        
        url = URI.parse(plain_uri)
        req = Net::HTTP::Get.new(url.to_s)
        
        res = Net::HTTP.start(url.host, url.port) {|http|
            http.request(req)
        }
        joke = CGI.unescapeHTML(JSON.parse(res.body)['value']['joke'])
    
    rescue StandardError
    	joke = "Chuck Norris never sleeps? Well, even Chuck Norris needs a power nap every once in a while ..."
    end  
  
    return joke
end

# Get changed files between hashes - check if commits contain file named '.do_not_merge'
changed_files = `git diff --name-only --stat #{hash_from}..#{hash_to}`.chop
do_not_merge = changed_files.split(/\n/)

##################################################
# Check if this is the .do_not_merge__ORIGIN Branch
##################################################
def is_not_origin_branch(origin_branch)
    current_branch = @branch.split(/\//).last
    origin_branch = origin_branch.split(/__/).last
    return current_branch != origin_branch
end

######################################
# Decide whether to ban or not to ban
######################################
do_not_merge.each do |file|    
    if (file[/^.do_not_merge__/])
        if(is_not_origin_branch(file))
            puts "☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️"
            puts get_joke().blue
            puts ""
            puts "The file #{file} stops you from pushing your changes to remote.".red
            puts "You don't want to commit your changes done in DO_NOT_MERGE Branch to master or any other Branch.".red
            puts ""
            puts "To reset your branch use 'git reset --hard origin/#{@branch.split(/\//).last}'. This will reset your Branch to the state of the origin/remote branch"
            puts "\n☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️  ☠️"
            exit 1
        end
    end
end