#!/usr/bin/ruby
curpath = __dir__
require 'rubygems'
require 'optparse'
require 'fileutils'
require 'webrick'
require 'typhoeus'
require 'xml/smart'
require 'zip'
require 'pp'

def wrap(s, width=78, indent=18)
	lines = []
	line, s = s[0..indent-2], s[indent..-1]
  s.split(/\n/).each do |ss|
    ss.split(/[ \t]+/).each do |word|
      if line.size + word.size >= width
        lines << line
        line = (" " * (indent)) + word
      else
        line << " " << word
      end
    end
    lines << line if line
    line = (" " * (indent-1))
  end
	return lines.join "\n"
end

ARGV.options { |opt|
  opt.summary_indent = ' ' * 2
  opt.banner = "Usage:\n#{opt.summary_indent}#{File.basename($0)} [options] ui | cpui DIR | new DIR | archive DIR URL | abandon URL\n"
  opt.on("Options:")
  opt.on("--help", "-h", "This text") { puts opt; exit }
	opt.on("")
  opt.on(wrap("[archive DIR URL] save properties from all finished instances listed at URL into DIR. Examples:\ncpee archive ./archive http://localhost:9298/1/\ncpee archive ./archive http://localhost:9298/1-200\ncpee archive ./archive http://localhost:9298/*"))
	opt.on("")
  opt.on(wrap("[abandon URL]     running processes are stopped; ready or stopped processes are abandoned. Examples:\ncpee abandon http://localhost:9298/1/\ncpee abandon http://localhost:9298/1-200\ncpee abandon http://localhost:9298/*"))
	opt.on("")
  opt.on(wrap("[start URL]       stopped processes are started; all others are not touched. Examples:\ncpee start http://localhost:9298/1\ncpee start http://localhost:9298/1-200\ncpee start http://localhost:9298/*"))
	opt.on("")
  opt.on(wrap("[delete! URL]     DANGER ZONE. Vanishes forever. Not in archive. Examples:\ncpee delete! http://localhost:9298/1/"))
	opt.on("")
  opt.on(wrap("[new DIR]         scaffolds a sample execution engine. Everything except instances can be removed for default behaviour."))
	opt.on("")
  opt.on(wrap("[inst DIR]        scaffolds a sample instantiation service. Post a testset to a model to keep going in one operation."))
	opt.on("")
  opt.on(wrap("[cpui DIR]        scaffolds a sample html client. New versions might require manual merging if you changed something."))
	opt.on("")
  opt.on(wrap("[ui]              starts a simple static web server with the ui on http://localhost:8080. Use [cpui DIR] if you want stuff in apache or nginx."))
  opt.parse!
}
if (ARGV.length == 0) ||
   (ARGV.length == 1  && ARGV[0] != 'ui') ||
   (ARGV.length == 2  && !(%w(abandon inst start delete! cpui new).include?(ARGV[0]))) ||
   (ARGV.length == 3  && ARGV[0] != 'archive') ||
   (ARGV.length >  3)
  puts ARGV.options
  exit
end
command = ARGV[0]
p1      = ARGV[1]
p2      = ARGV[2]
cockpit = "#{curpath}/../cockpit/"

def js_libs(cockpit)
  res = Typhoeus.get('http://cpee.org/js_libs/js_libs.zip')
  if res.success?
    File.write(File.join(cockpit,'js_libs.zip'),res.response_body)
    Zip::File.open(File.join(cockpit,'js_libs.zip')) do |zip_file|
      zip_file.each do |entry|
        case entry.ftype
          when :directory
            Dir.mkdir(File.join(cockpit,entry.name)) rescue nil
          when :file
            File.write(File.join(cockpit,entry.name),entry.get_input_stream.read)
          when :symlink
            FileUtils.ln_s(File.join('.',entry.get_input_stream.read),File.join(cockpit,entry.name), force: true)
        end
      end
    end
    true
  else
    puts 'Internet access required to download javascript libs from "http://cpee.org/js_libs/js_libs.zip".'
    false
  end
end

if command == 'ui'
  if js_libs(cockpit)
    s = WEBrick::HTTPServer.new(:Port => 8080,  :DocumentRoot => "#{curpath}/../cockpit/")
    trap("INT"){ s.shutdown }
    s.start
  end
elsif command == 'cpui'
  if js_libs(cockpit)
    if !File.exists?(p1)
      FileUtils.cp_r("#{curpath}/../cockpit/",p1)
    else
      puts "Directory already exists."
    end
  end
elsif command == 'inst'
  if !File.exists?(p1)
    FileUtils.cp_r("#{curpath}/instantiation/",p1)
  else
    puts 'Directory already exists.'
  end
elsif command == 'archive'
  p2 = File.join(p2,'*') if p2 =~ /([a-zA-Z]|\/)$/
  base = File.dirname(p2)
  names = []
  if File.basename(p2) =~ /(\d+)-(\d+)/
    names = ($1.to_i..$2.to_i).to_a
  elsif File.basename(p2) == '*'
    res = Typhoeus.get(File.join(base))
    if res.success?
      XML::Smart.string(res.response_body) do |doc|
        doc.find('//instance/@id').each do |ele|
          names << ele.value
        end
      end
      names.reverse!
    else
      exit
    end
  else
    names << File.basename(p2)
  end
  names.each do |name|
    res = Typhoeus.get(File.join(base,name.to_s,'/'))
    if res.success?
      if res.headers['Content-Type'] =~ /^(text|application)\/xml/
        XML::Smart.string(res.response_body) do |doc|
          if doc.root.qname.to_s == "instances"
            doc.root.children.each do |i|
              if ["finished","abandoned"].include?(i.attributes['state'])
                prop = Typhoeus.get(File.join(base,name.to_s,i.attributes['id'],'properties','/'))
                if prop.success?
                  File.write(File.join(p1,i.attributes['uuid'] + '.xml'),prop.response_body) if prop.headers['Content-Type'] =~ /^(text|application)\/xml/
                  Typhoeus.delete(File.join(base,name.to_s,i.attributes['id'],'/'))
                end
              end
            end
          elsif doc.root.qname.to_s == "info"
            prop = Typhoeus.get(File.join(base,name.to_s,'properties','/'))
            if prop.success?
              xprop = XML::Smart::string(prop.response_body)
              xprop.register_namespace 'p', 'http://riddl.org/ns/common-patterns/properties/1.0'
              if ["finished","abandoned"].include?(xprop.find("string(/p:properties/p:state)"))
                uuid = xprop.find("string(/p:properties/p:attributes/p:uuid)")
                id = name.to_s
                File.write(File.join(p1,uuid + '.xml'),prop.response_body) if prop.headers['Content-Type'] =~ /^(text|application)\/xml/
                Typhoeus.delete(File.join(base,name.to_s,'/'))
              end
            end
          end
        end
      end
    end
  end
elsif command == 'abandon'
  p1 = File.join(p1,'*') if p1 =~ /([a-zA-Z]|\/)$/
  base = File.dirname(p1)
  names = []
  if File.basename(p1) =~ /(\d+)-(\d+)/
    names = ($1.to_i..$2.to_i).to_a
  elsif File.basename(p1) == '*'
    res = Typhoeus.get(File.join(base))
    if res.success?
      XML::Smart.string(res.response_body) do |doc|
        doc.find('//instance/@id').each do |ele|
          names << ele.value
        end
      end
      names.reverse!
    else
      exit
    end
  else
    names << File.basename(p1)
  end
  names.each do |name|
    res = Typhoeus.get(File.join(base,name.to_s,'properties','values','state','/'))
    if res.success?
      case res.response_body
        when "ready", "stopped" then
          Typhoeus.put(File.join(base,name.to_s,'properties','values','state','/'), headers: {'Content-Type' => 'application/x-www-form-urlencoded'}, body: "value=abandoned")
      end
    end
  end
elsif command == 'start'
  p1 = File.join(p1,'*') if p1 =~ /([a-zA-Z]|\/)$/
  base = File.dirname(p1)
  names = []
  if File.basename(p1) =~ /(\d+)-(\d+)/
    names = ($1.to_i..$2.to_i).to_a
  elsif File.basename(p1) == '*'
    res = Typhoeus.get(File.join(base))
    if res.success?
      XML::Smart.string(res.response_body) do |doc|
        doc.find('//instance/@id').each do |ele|
          names << ele.value
        end
      end
      names.reverse!
    else
      exit
    end
  else
    names << File.basename(p1)
  end
  names.each do |name|
    res = Typhoeus.get(File.join(base,name.to_s,'properties','values','state','/'))
    if res.success?
      case res.response_body
        when "stopped" then
          keep_alive = Typhoeus.get(File.join(base,name.to_s,'properties','values','attributes','keep_alive','/'))
          if keep_alive.success?
            Typhoeus.put(File.join(base,name.to_s,'properties','values','state','/'), headers: {'Content-Type' => 'application/x-www-form-urlencoded'}, body: "value=running")
          end
      end
    end
  end
elsif command == 'delete!'
  Typhoeus.delete(File.join(p1,'/'))
elsif command == 'new'
  if !File.exists?(p1)
    FileUtils.cp_r("#{curpath}/server/",p1)
    FileUtils.mkdir("#{p1}/instances") rescue nil
    FileUtils.mkdir("#{p1}/resources") rescue nil
    FileUtils.mkdir("#{p1}/handlerwrappers") rescue nil
  else
    puts 'Directory already exists.'
  end
end