#!/usr/bin/env ruby

# git.rb - a P4 shim that pretends to be Git so that it can work with Xcode
# entirely experimental: here be dragons

require 'fileutils'

begin
    f = File.open('/Users/matt/fauxgit_log.txt', 'a')
    f.puts ARGV.join(' ')
    f.puts "Total args: #{ARGV.size()}"

    p4 = '/usr/local/bin/p4'

    # require a P4 URI because it's my tool
    # URIs are of the form [username@]p4://<hostname[:port]/<depot path>
	case ARGV[0]
    when 'clone'
        matches = /p4:\/\/(.+?)@(.+?)\/(.*)|p4:\/\/(.+?)\/(.*)/.match(ARGV[4])
        
        user = matches.captures[0]
        port = matches.captures[1] || matches.captures[3]
        path = matches.captures[2] || matches.captures[4]

        # let's be civilized and not require a port
        if port !~ /:\d*/
            port = port + ":1666"
        end

        cmd = "#{p4} -d #{ARGV[5]}"
        cmd += " -u #{user}" if user

        # running the clone and creating a fake git repo to appease Xcode
        f.puts "#{cmd} clone -p #{port} -f //#{path}/..."
        `#{cmd} clone -p #{port} -f //#{path}/...`
        FileUtils.mkdir_p "#{ARGV[5]}/.git/info"
        FileUtils.mkdir_p "#{ARGV[5]}/.git/refs"
        FileUtils.mkdir_p "#{ARGV[5]}/.git/objects"
        FileUtils.mkdir_p "#{ARGV[5]}/.git/hooks"
        FileUtils.touch "#{ARGV[5]}/.git/HEAD"
        FileUtils.touch "#{ARGV[5]}/.git/config"
        FileUtils.touch "#{ARGV[5]}/.git/description"

        # totally lying here, but it seems to make XCode happy?
        # will experiment sometime with removing this now that I 
        # do a better job of creating the directories it wants
        puts "Cloning into '#{ARGV[4]}'..."
        puts "remote: Counting objects: 596, done."
        puts "remote: Compressing objects: 100% (309/309), done."
        puts "remote: Total 596 (delta 275), reused 596 (delta 275)"
        puts "Receiving objects: 100% (596/596), 107.22 KiB | 0 bytes/s, done."
        puts "Resolving deltas: 100% (275/275), done."
        puts "Checking connectivity... done."
    when 'init'
        f.puts "#{p4} init"
        `#{p4} init`
        FileUtils.mkdir_p ".git/info"
        FileUtils.mkdir_p ".git/refs"
        FileUtils.mkdir_p ".git/objects"
        FileUtils.mkdir_p ".git/hooks"
        FileUtils.touch ".git/HEAD"
        FileUtils.touch ".git/config"
        FileUtils.touch ".git/description"
    when 'add'
        f.puts "#{p4} rec"
        `#{p4} rec ...`
    when 'status'
        f.puts "#{p4} -ztag -F '%change% %action% %localFile%' status"
        results = `#{p4} -ztag -F '%change% %action% %localFile%' status`

        results.each_line do |r|
            if r.start_with?(' add ')
                puts "?? #{r.split(' ')[1]}"
            elsif r.start_with?('default add ')
                puts "A  #{r.split(' ')[2]}"
            elsif r.start_with?(' edit ')
                puts " M #{r.split(' ')[1]}"
            elsif r.start_with?('default edit ')
                puts "M  #{r.split(' ')[2]}"
            elsif r.start_with?(' delete ')
                puts " D #{r.split(' ')[1]}"
            elsif r.start_with?('default delete ')
                puts "D  #{r.split(' ')[2]}"
            end
        end
    when 'branch'
        if ARGV.size() == 1
            results = `#{p4} switch -l`
                
            results.each_line do |r|
                if r.end_with?("*\n")
                    puts "* #{r.split(' ')[0]}"
                else
                    puts "  #{r}"
                end
            end  
        elsif ARGV.size() == 3
            results = `#{p4} switch -cr -P #{ARGV[2]} #{ARGV[1]}`
        end
    when 'mv'
        f.puts "#{p4} edit #{ARGV[1]}"
        f.puts "#{p4} move #{ARGV[1]} #{ARGV[2]}"

        `#{p4} edit #{ARGV[1]}`
        `#{p4} move #{ARGV[1]} #{ARGV[2]}`
    when 'rm'
        if ARGV[1] == '-f' && ARGV[2] == '-r'  && ARGV[3] == '--'
            ARGV[4..-1].each do |f|
                f.puts "#{p4} delete #{f}"
                f.puts "#{p4} delete #{f}/..."

                `#{p4} delete #{f}`
                `#{p4} delete #{f}/...`
            end
        end
    when 'commit'
        `#{p4} rec` # Git forces the file to commit by specifying it, we don't have that
        `#{p4} submit -d #{ARGV[2]}`
    when 'checkout'
        `#{p4} switch #{ARGV[1]}`
    when 'blame'
        puts 'p4 annotate'
    when 'archive'
        STDOUT.write `find . -name #{ARGV[2]} | xargs /usr/bin/tar c`
    when 'log'
        `p4 changes -m1`
    when 'config' && ARGV[1] == '--get'
        if ARGV[2] == 'branch.default.remote'
            puts 'default'
        elsif ARGV[2] == 'branch.default.merge'
            puts 'refs/heads/default'
        elsif ARGV[2]  == 'remote.origin.url'
            puts 'matt_attaway@perforce.com/stuff'
        end
    when 'remote'
        puts "origin\x09http://xxxxx (fetch)"
        puts "origin\x09http://xxxxx (push)"
    when 'ls-remote'
        puts "3828d854bb849581255a20cbbc4e0e639fba2eb7\trefs/heads/master"
    end

    f.puts ""
    f.close()
end