require 'spec/runner/formatter/html_formatter'
require 'win32/screenshot'
require 'rmagick'
require 'pathname'
require 'fileutils'

module WatirSplash
  # Custom RSpec formatter for WatirSplash
  # * saves screenshot of the browser upon test failure
  # * saves html of the browser upon test failure
  # * saves javascript error dialog upon test failure
  # * saves all files generated/downloaded during the test and shows them in the report
  class HtmlFormatter < ::Spec::Runner::Formatter::HtmlFormatter

    # currently used browser object
    # needed for saving of screenshots and html
    attr_writer :browser

    def initialize(options, output) # :nodoc:
      raise "output has to be a file path!" unless output.is_a?(String)
      @output_dir = File.expand_path(File.dirname(output))
      archive_results

      puts "Results will be saved into the directory #{@output_dir}"
      @files_dir = File.join(@output_dir, "files")
      FileUtils.mkdir_p(@files_dir)
      @files_saved_during_example = []
      super
    end

    def example_group_started(example_group) # :nodoc:
      @files_saved_during_example.clear
      append_extra_information_to_desc(example_group)
      super
    end

    def example_started(example) # :nodoc:
      @files_saved_during_example.clear
      example.description += "#{example.location.scan(/:\d+$/)} (#{Time.now.strftime("%H:%M:%S")})"
      super
    end

    def extra_failure_content(failure) # :nodoc:
      if @browser.exists?
        save_html
        save_screenshot
      end

      content = []
      content << "<span>"
      @files_saved_during_example.each {|f| content << link_for(f)}
      content << "</span>"
      super + content.join($/)
    end

    def link_for(file) # :nodoc:
      return unless File.exists?(file[:path])

      description = file[:desc] ? file[:desc] : File.extname(file[:path]).upcase[1..-1]
      path = Pathname.new(file[:path])
      "<a href='#{path.relative_path_from(Pathname.new(@output_dir))}'>#{description}</a>&nbsp;"
    end

    def save_html # :nodoc:
      begin
        html = @browser.html
        file_name = file_path("browser.html")
        File.open(file_name, 'w') {|f| f.puts html}
      rescue => e
        $stderr.puts "saving of html failed: #{e.message}"
      end
      file_name
    end

    def save_screenshot(description="Screenshot", hwnd=nil) # :nodoc:
      begin
        hwnd ||= @browser.hwnd
        @browser.bring_to_front
        Win32::Screenshot.hwnd(hwnd) do |width, height, blob|
          file_name = file_path("screenshot.png", description)
          img = Magick::ImageList.new
          img.from_blob(blob)
          img.write(file_name)
        end
      rescue => e
        $stderr.puts "saving of screenshot failed: #{e.message}"
      end
      file_name
    end

    # Generates unique file name and path for each example.
    #
    # All file names generated with this method will be shown
    # on the report.
    def file_path(file_name, description=nil)
      extension = File.extname(file_name)
      basename = File.basename(file_name, extension)
      file_path = File.join(@files_dir, "#{basename}_#{Time.now.strftime("%H%M%S")}_#{example_group_number}_#{example_number}#{extension}")
      @files_saved_during_example.unshift(:desc => description, :path => file_path)
      file_path
    end

    private

    def archive_results
      if File.exists?(@output_dir)
        archive_dir = File.join(@output_dir, "../archive")
        FileUtils.mkdir_p(archive_dir) unless File.exists?(archive_dir)
        FileUtils.mv @output_dir, File.join(archive_dir, "#{File.basename(@output_dir)}_#{File.mtime(@output_dir).strftime("%y%m%d_%H%M%S")}")
      end
    end

    def append_extra_information_to_desc(example_group)
      date = Time.now.strftime("%d.%m.%Y")
      spec_dir = Pathname.new(example_group.location)
      relative_spec_path = spec_dir.relative_path_from(Pathname.new(Dir.pwd + "/spec")).to_s
      appended_description = " @ #{relative_spec_path}#{example_group.location.scan(/:\d+$/)} (#{date})"
      example_group.description += appended_description
      # needed for NestedTextFormatter
      example_group.nested_descriptions.map! {|nested_description| nested_description + appended_description}
    end

  end
end