require_relative 'string.rb'
module Helpers
  class Git
    def self.remote
      begin
        `git remote -v show`.lines.first.strip.match(/github\.com[\/|:](.+)\.git/)[1]
      rescue
        $stderr.puts 'Unable to retrieve slug from >> git remote -v show'
        exit 1
      end
    end
    def self.repo
      remote
    end
    def self.branch
      `git rev-parse --abbrev-ref HEAD`.strip
    end
    def self.tag
      (`git describe --tags --match 'v*' --abbrev=0 2>/dev/null` || 'HEAD').strip
    end
    def self.clean_tag(tag=self.tag, rubygem:false)
      array = tag.strip.sub('v','').split(/[\.,-]/).select { |e| e.is_number? || (rubygem && e == 'pre') }
      if rubygem then
        array.join('.')
      else
        array.first(3).join('.')
      end
    end
    def self.commit_count
      `git rev-list --count HEAD`.to_i
    end
    def self.commit_count_since_tag(tag)
      `git rev-list --count #{tag}.. 2>/dev/null`.to_i
    end
    def self.commit_author
      `git --no-pager show -s --format='%an' -1`
    end
    def self.commit_email
      `git --no-pager show -s --format='%ae' -1`
    end
    def self.installed?
      system 'git --version >>/dev/null 2>&1'
    end
    def self.parse_deploy(commitMessage)
      deploy = {}
      commands = %w(deploy DEPLOY force_deploy FORCE_DEPLOY).collect{ |command| "\\b#{command}\\b" }.join("|")
      re_command_and_message = Regexp.new(/<(#{commands}):?\s*(.*?)(?:>)/)
      result = commitMessage.scan(re_command_and_message).flatten.compact
      deploy[:match] = !result[0].nil? && !result[0].empty?
      re_channel = Regexp.new(/\s*([@#][A-z]+)\s*/)
      deploy[:message] = result[1] ? result[1].gsub(re_channel, '') : ''
      if result[1] && result[1].scan(re_channel) && result[1].scan(re_channel).first then
        deploy[:channel] = result[1].scan(re_channel).first.first || ''
      end
      deploy[:author] = commit_author || ''
      return deploy
    end
    def self.parse_crashlytics(commitMessage)
      return commitMessage.scan(/(c|C):(?<crashlytics>\d+)/).flatten.collect { |x| x.to_i }.uniq
    end
    def self.parse_sprintly(commitMessage)
      #logic from https://github.com/sprintly/sprintly-commit-parser/blob/master/sprintly_commit_parser/commit_parser.py
      commandsRE = Regexp.new(/(?<action>[A-Za-z]*) ?(task|issue|defect|bug|item|ticket|:)?.?(?<ticket>(?:#|(?:ticket|issue|item|defect|bug)[: ]?)(\d+)(?:(?:[, &]*|[ ,]+?and[ ]?)(?:#|(?:ticket|issue|item|defect|bug)[: ]?)(\d+))*)/)
      ticketsRE = Regexp.new(/(?:#|(?:ticket|issue|item|defect|bug)[: ]?)(\d+)/)
      commands = commitMessage.downcase.scan(commandsRE)
      tickets = commands.collect { |command|
        command.last.scan(ticketsRE) unless command.first.empty? #only collect tickets with commands
        }
      return tickets.flatten.compact.collect{ |x| x.to_i }.uniq
    end
    def self.parse_commit_message(commitMessage)
      h = {}
      deploy = self.parse_deploy(commitMessage)
      sprintly_tickets = self.parse_sprintly(commitMessage)
      crashlytics_ids = self.parse_crashlytics(commitMessage)
      h[:deploy] = deploy
      h[:sprintly] = sprintly_tickets
      h[:crashlytics] = crashlytics_ids
      return h
    end
    def self.commit_sha
      `git rev-parse HEAD`.strip
    end
    def self.commit_short_sha
      `git rev-parse --short HEAD`.strip
    end
  end
end