require 'rake/tasklib'
require 'thread'
require 'webrick'
require 'fileutils'
include FileUtils

class Browser
  def supported?; true; end
  def setup ; end
  def open(url) ; end
  def teardown ; end

  def host
    require 'rbconfig'
    Config::CONFIG['host']
  end
  
  def macos?
    host.include?('darwin')
  end
  
  def windows?
    host.include?('mswin')
  end
  
  def linux?
    host.include?('linux')
  end
  
  def applescript(script)
    raise "Can't run AppleScript on #{host}" unless macos?
    system "osascript -e '#{script}' 2>&1 >/dev/null"
  end
end

class FirefoxBrowser < Browser
  def initialize(path=File.join(ENV['ProgramFiles'] || 'c:\Program Files', '\Mozilla Firefox\firefox.exe'))
    @path = path
  end

  def visit(url)
    applescript('tell application "Firefox" to Get URL "' + url + '"') if macos? 
    system("#{@path} #{url}") if windows? 
    system("firefox #{url}") if linux?
  end

  def to_s
    "Firefox"
  end
end

class SafariBrowser < Browser
  def supported?
    macos?
  end
  
  def setup
    applescript('tell application "Safari" to make new document')
  end
  
  def visit(url)
    applescript('tell application "Safari" to set URL of front document to "' + url + '"')
  end

  def teardown
    #applescript('tell application "Safari" to close front document')
  end

  def to_s
    "Safari"
  end
end

class IEBrowser < Browser
  def setup
    require 'win32ole' if windows?
  end

  def supported?
    windows?
  end
  
  def visit(url)
    if windows?
      ie = WIN32OLE.new('InternetExplorer.Application')
      ie.visible = true
      ie.Navigate(url)
      while ie.ReadyState != 4 do
        sleep(1)
      end
    end
  end

  def to_s
    "Internet Explorer"
  end
end

class KonquerorBrowser < Browser
  @@configDir = File.join((ENV['HOME'] || ''), '.kde', 'share', 'config')
  @@globalConfig = File.join(@@configDir, 'kdeglobals')
  @@konquerorConfig = File.join(@@configDir, 'konquerorrc')

  def supported?
    linux?
  end

  # Forces KDE's default browser to be Konqueror during the tests, and forces
  # Konqueror to open external URL requests in new tabs instead of a new
  # window.
  def setup
    cd @@configDir, :verbose => false do
      copy @@globalConfig, "#{@@globalConfig}.bak", :preserve => true, :verbose => false
      copy @@konquerorConfig, "#{@@konquerorConfig}.bak", :preserve => true, :verbose => false
      # Too lazy to write it in Ruby...  Is sed dependency so bad?
      system "sed -ri /^BrowserApplication=/d  '#{@@globalConfig}'"
      system "sed -ri /^KonquerorTabforExternalURL=/s:false:true: '#{@@konquerorConfig}'"
    end
  end

  def teardown
    cd @@configDir, :verbose => false do
      copy "#{@@globalConfig}.bak", @@globalConfig, :preserve => true, :verbose => false
      copy "#{@@konquerorConfig}.bak", @@konquerorConfig, :preserve => true, :verbose => false
    end
  end
  
  def visit(url)
    system("kfmclient openURL #{url}")
  end
  
  def to_s
    "Konqueror"
  end
end

class OperaBrowser < Browser
  def initialize(path='c:\Program Files\Opera\Opera.exe')
    @path = path
  end
  
  def setup
    if windows?
      puts %{
        MAJOR ANNOYANCE on Windows.
        You have to shut down Opera manually after each test
        for the script to proceed.
        Any suggestions on fixing this is GREATLY appreciated!
        Thank you for your understanding.
      }
    end
  end
  
  def visit(url)
    applescript('tell application "Opera" to GetURL "' + url + '"') if macos? 
    system("#{@path} #{url}") if windows? 
    system("opera #{url}")  if linux?
  end

  def to_s
    "Opera"
  end
end

# shut up, webrick :-)
class ::WEBrick::HTTPServer
  def access_log(config, req, res)
    # nop
  end
end
class ::WEBrick::BasicLog
  def log(level, data)
    # nop
  end
end

class NonCachingFileHandler < WEBrick::HTTPServlet::FileHandler
  def do_GET(req, res)
    super
    
    res['Content-Type'] = case req.path
      when /\.js$/   then 'text/javascript'
      when /\.html$/ then 'text/html'
      when /\.css$/  then 'text/css'
      else 'text/plain'
    end
    
    res['ETag'] = nil
    res['Last-Modified'] = Time.now + 100**4
    res['Cache-Control'] = 'no-store, no-cache, must-revalidate, post-check=0, pre-check=0'
    res['Pragma'] = 'no-cache'
    res['Expires'] = Time.now - 100**4
  end
end


class JavaScriptTestTask < ::Rake::TaskLib

  def initialize(name=:test)
    @name = name
    @tests = []
    @browsers = []

    @queue = Queue.new

    @server = WEBrick::HTTPServer.new(:Port => 4711) # TODO: make port configurable
    @server.mount_proc("/results") do |req, res|
      @queue.push({
        :tests => req.query['tests'].to_i,
        :assertions => req.query['assertions'].to_i,
        :failures => req.query['failures'].to_i,
        :errors => req.query['errors'].to_i
      })
      res.body = "OK"
    end
    @server.mount_proc("/content-type") do |req, res|
      res.body = req["content-type"]
    end
    @server.mount_proc("/response") do |req, res|
      req.query.each {|k, v| res[k] = v unless k == 'responseBody'}
      res.body = req.query["responseBody"]
    end    
    yield self if block_given?
    define
  end

  def define
    task @name do
      trap("INT") { @server.shutdown }
      t = Thread.new { @server.start }
      
      # run all combinations of browsers and tests
      @browsers.each do |browser|
        if browser.supported?
          t0 = Time.now
          results = {:tests => 0, :assertions => 0, :failures => 0, :errors => 0}
          errors = []
          failures = []
          browser.setup
          puts "\nStarted tests in #{browser}"
          @tests.each do |test|
            browser.visit("http://localhost:4711#{test}?resultsURL=http://localhost:4711/results&t=" + ("%.6f" % Time.now.to_f))
 
            result = @queue.pop
            result.each { |k, v| results[k] += v }
            value = "."
            
            if result[:failures] > 0
              value = "F"
              failures.push(test)
            end
            
            if result[:errors] > 0
              value = "E"
              errors.push(test)
            end
            
            print value
          end
          
          puts "\nFinished in #{(Time.now - t0).round.to_s} seconds."
          puts "  Failures: #{failures.join(', ')}" unless failures.empty?
          puts "  Errors:   #{errors.join(', ')}" unless errors.empty?
          puts "#{results[:tests]} tests, #{results[:assertions]} assertions, #{results[:failures]} failures, #{results[:errors]} errors"
          browser.teardown
        else
          puts "\nSkipping #{browser}, not supported on this OS"
        end
      end

      @server.shutdown
      t.join
    end
  end

  def mount(path, dir=nil)
    dir = Dir.pwd + path unless dir

    # don't cache anything in our tests
    @server.mount(path, NonCachingFileHandler, dir)
  end

  # test should be specified as a url
  def run(test)
    @tests<<test
  end

  def browser(browser)
    browser =
      case(browser)
        when :firefox
          FirefoxBrowser.new
        when :safari
          SafariBrowser.new
        when :ie
          IEBrowser.new
        when :konqueror
          KonquerorBrowser.new
        when :opera
          OperaBrowser.new
        else
          browser
      end

    @browsers<<browser
  end
end