require 'rubygems'
require 'yaml'
require 'cgi'
require 'net/smtp'
require 'digest/sha1'

require 'logger'
require 'diff_to_html'
require 'emailer'
require 'git'

class CommitHook

  class << self
    attr_reader :config

    def show_error(message)
      $stderr.puts "************** GIT NOTIFIER PROBLEM *******************"
      $stderr.puts "\n"
      $stderr.puts message
      $stderr.puts "\n"
      $stderr.puts "************** GIT NOTIFIER PROBLEM *******************"
    end

    def info(message)
      $stdout.puts message
      $stdout.flush
    end

    def logger
      @logger ||= Logger.new(config)
    end

    def run(config_name, rev1, rev2, ref_name)
      @config = File.exists?(config_name) ? YAML::load_file(config_name) : {}

      project_path = Dir.getwd
      recipient = config["mailinglist"] || Git.mailing_list_address

      if recipient.nil? || recipient.length == 0
        CommitHook.show_error(
          "Please add a recipient for the emails. Eg : \n" +
          "      git config hooks.mailinglist  developer@example.com"
        )
        return
      end

      logger.debug('----')
      logger.debug("pwd: #{Dir.pwd}")
      logger.debug("ref_name: #{ref_name}")
      logger.debug("rev1: #{rev1}")
      logger.debug("rev2: #{rev2}")


      info("Sending mail...")

    prefix = @config["emailprefix"] || Git.repo_name
    branch_name = (ref_name =~ /master$/i) ? "" : "/#{ref_name.split("/").last}"

      logger.debug("prefix: #{prefix}")
      logger.debug("branch: #{branch_name}")

      diff2html = DiffToHtml.new(Dir.pwd, config)
      diff2html.diff_between_revisions(rev1, rev2, prefix, ref_name)

      diffresult = diff2html.result

      if config["ignore_merge"]
        diffresult = diffresult.reject do |result|
          !result[:commit_info][:merge].nil?
        end
      end

      if config["group_email_by_push"]
        text, html = [], []
        diffresult.each_with_index do |result, i|
          text << result[:text_content]
          html << result[:html_content]
        end
        result = diffresult.first
        return if result.nil? || !result[:commit_info]

        emailer = Emailer.new(config,
          :project_path => project_path,
          :recipient => recipient,
          :from_address => config["from"] || result[:commit_info][:email],
          :from_alias => result[:commit_info][:author],
          :subject => "[#{prefix}#{branch_name}] #{diffresult.size > 1 ? "#{diffresult.size} commits: " : ''}#{result[:commit_info][:message]}",
          :text_message => text.join("------------------------------------------\n\n"),
          :html_message => html.join("<hr /><br />"),
          :old_rev => rev1,
          :new_rev => rev2,
          :ref_name => ref_name
        )
        emailer.send
      else
        diffresult.reverse.each_with_index do |result, i|
          next unless result[:commit_info]
          nr = number(diffresult.size, i)

          emailer = Emailer.new(config,
            :project_path => project_path,
            :recipient => recipient,
            :from_address => config["from"] || result[:commit_info][:email],
            :from_alias => result[:commit_info][:author],
            :subject => "[#{prefix}#{branch_name}]#{nr} #{result[:commit_info][:message]}",
            :text_message => result[:text_content],
            :html_message => result[:html_content],
            :old_rev => rev1,
            :new_rev => rev2,
            :ref_name => ref_name
          )
          emailer.send
        end
      end
    end

    def number(total_entries, i)
      return '' if total_entries <= 1
      digits = total_entries < 10 ? 1 : 3
      '[' + sprintf("%0#{digits}d", i + 1) + ']'
    end
  end
end

__END__

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