#!/usr/bin/env ruby

require 'test/unit'
currentPath = File.dirname(__FILE__)
require File.join( currentPath, '../../lib/masterview' )
require 'masterview/extras/watcher.rb'

class TestTemplateWatcher < Test::Unit::TestCase

  MVTestDir = File.expand_path( File.join(File.dirname(__FILE__), '..' ) )
  TestFixturesDir = "#{MVTestDir}/fixtures/templates"
  TemplateSrcDir = "#{MVTestDir}/tmp/templates_src"
  TemplateFilenamePattern = '*.html'
  TemplateDstDir = "#{MVTestDir}/tmp/views"

  DEBUG_TRACE = false
  if DEBUG_TRACE
    STDOUT.puts "\nTEST TEMPLATE CHANGE-DETECTION"
    STDOUT.puts "\nTest case root directories:"
    STDOUT.puts "...MvTestDir=#{MVTestDir}"
    STDOUT.puts "...TestFixturesDir=#{TestFixturesDir}"
    STDOUT.puts "...TemplateSrcDir=#{TemplateSrcDir}"
    STDOUT.puts "...TemplateDstDir=#{TemplateDstDir}"
  end
 
  # a template file that we'll monitor to verify change detection
  TestSubjectFileShortName = 'product.html'
  TestFixtureFile = "#{TestFixturesDir}/product.html"
  TestSubjectFile = "#{TemplateSrcDir}/#{TestSubjectFileShortName}"

  def setup
    unless File.exists?(TestSubjectFile)
      # isolate a copy of the observed template file in our templates source test dir 
      # so we can bash its file timestamp to test changed-file detection
      FileUtils.mkdir_p TemplateSrcDir unless File.directory?(TemplateSrcDir)
      FileUtils.copy TestFixtureFile, TestSubjectFile, :preserve => false  #WAS: true
      STDOUT.puts "\n========== test setup ==================" if DEBUG_TRACE
      STDOUT.puts "...installed test fixture #{TestFixtureFile}" if DEBUG_TRACE
      STDOUT.puts "...#{TestSubjectFileShortName} template timestamp=#{File.mtime(TestSubjectFile)}" if DEBUG_TRACE
    end
    @template_mio_tree = MasterView::FileMIOTree.new(TemplateSrcDir, '.html')
    @output_mio_tree = MasterView::FileMIOTree.new(TemplateDstDir, '.rhtml')
  end

  def test_a_parse_template_on_startup
    STDOUT.puts "\n========== test_a_parse_template_on_startup ==========" if DEBUG_TRACE
    STDOUT.puts "...#{TestSubjectFileShortName} template timestamp=#{File.mtime(TestSubjectFile)}" if DEBUG_TRACE
    STDOUT.puts "...clearing dir #{TemplateDstDir}" if DEBUG_TRACE && File.exists?(TemplateDstDir)

    FileUtils.remove_dir(TemplateDstDir, true)
    files_processed = MasterView::TemplateWatcher.check_updated(@template_mio_tree, TemplateFilenamePattern) do |mio|
      MasterView::Parser.parse_mio( mio, @output_mio_tree )
    end

    assert_equal [ TestSubjectFileShortName ], files_processed
    assert File.exist?(TemplateDstDir+'/layouts/product.rhtml')
    assert File.exist?(TemplateDstDir+'/product/_form.rhtml')
    assert File.exist?(TemplateDstDir+'/product/edit.rhtml')
    assert File.exist?(TemplateDstDir+'/product/list.rhtml')
    assert File.exist?(TemplateDstDir+'/product/new.rhtml')
    assert File.exist?(TemplateDstDir+'/product/show.rhtml')

    STDOUT.puts "...files_processed [ #{files_processed.join(', ')} ]" if DEBUG_TRACE
  end

  def test_b_check_template_no_change
    STDOUT.puts "\n========== test_b_check_template_no_change =============" if DEBUG_TRACE
    STDOUT.puts "...#{TestSubjectFileShortName} template timestamp=#{File.mtime(TestSubjectFile)}" if DEBUG_TRACE

    assert_equal true, File.directory?(TemplateDstDir)
    files_processed = parse_changed_templates

    assert_equal [], files_processed
    STDOUT.puts "...files_processed [ #{files_processed.join(', ')} ]" if DEBUG_TRACE
  end

  def test_c_reparse_changed_template
    STDOUT.puts "\n========== test_c_reparse_changed_template =============" if DEBUG_TRACE
    STDOUT.puts "...#{TestSubjectFileShortName} template timestamp=#{File.mtime(TestSubjectFile)}" if DEBUG_TRACE

    # touch gets permission-denied error on Win32, so work around
    sleep 1 # make sure noticeable time passes
    if RUBY_PLATFORM =~ /mswin32/
      # re-copy the test fixture to get a new timestamp
      STDOUT.puts "...forcing update of template #{TestSubjectFileShortName}" if DEBUG_TRACE
      #FileUtils.copy TestFixtureFile, TestSubjectFile, :preserve => false
      File.open( TestSubjectFile, 'a' ){ |file| file.write("\n          ") }
    else
      FileUtils.touch TestSubjectFile
    end   
    STDOUT.puts "...#{TestSubjectFileShortName} template timestamp=#{File.mtime(TestSubjectFile)}" if DEBUG_TRACE

    files_processed = parse_changed_templates
    assert_equal [ TestSubjectFileShortName ], files_processed
    STDOUT.puts "...files_processed [ #{files_processed.join(', ')} ]" if DEBUG_TRACE
  end

  def parse_changed_templates
    files_processed = MasterView::TemplateWatcher.check_updated(@template_mio_tree, TemplateFilenamePattern) do |mio|
      MasterView::Parser.parse_mio( mio, @output_mio_tree )
    end
    files_processed
  end

end