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# Redmine - project management software

# Copyright (C) 2006-2012  Jean-Philippe Lang

#

# This program is free software; you can redistribute it and/or

# modify it under the terms of the GNU General Public License

# as published by the Free Software Foundation; either version 2

# of the License, or (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

module Redmine

  module WikiFormatting

    module Macros

      module Definitions

        # Returns true if +name+ is the name of an existing macro

        def macro_exists?(name)

          Redmine::WikiFormatting::Macros.available_macros.key?(name.to_sym)

        end

        def exec_macro(name, obj, args, text)

          macro_options = Redmine::WikiFormatting::Macros.available_macros[name.to_sym]

          return unless macro_options

          method_name = "macro_#{name}"

          unless macro_options[:parse_args] == false

            args = args.split(',').map(&:strip)

          end

          begin

            if self.class.instance_method(method_name).arity == 3

              send(method_name, obj, args, text)

            elsif text

              raise "This macro does not accept a block of text"

            else

              send(method_name, obj, args)

            end

          rescue => e

            "<div class=\"flash error\">Error executing the <strong>#{h name}</strong> macro (#{h e.to_s})</div>".html_safe

          end

        end

        def extract_macro_options(args, *keys)

          options = {}

          while args.last.to_s.strip =~ %r{^(.+?)\=(.+)$} && keys.include?($1.downcase.to_sym)

            options[$1.downcase.to_sym] = $2

            args.pop

          end

          return [args, options]

        end

      end

      @@available_macros = {}

      mattr_accessor :available_macros

      class << self

        # Plugins can use this method to define new macros:

        #

        #   Redmine::WikiFormatting::Macros.register do

        #     desc "This is my macro"

        #     macro :my_macro do |obj, args|

        #       "My macro output"

        #     end

        #   

        #     desc "This is my macro that accepts a block of text"

        #     macro :my_macro do |obj, args, text|

        #       "My macro output"

        #     end

        #   end

        def register(&block)

          class_eval(&block) if block_given?

        end

        # Defines a new macro with the given name, options and block.

        #

        # Options:

        # * :desc - A description of the macro

        # * :parse_args => false - Disables arguments parsing (the whole arguments 

        #   string is passed to the macro)

        #

        # Macro blocks accept 2 or 3 arguments:

        # * obj: the object that is rendered (eg. an Issue, a WikiContent...)

        # * args: macro arguments

        # * text: the block of text given to the macro (should be present only if the

        #   macro accepts a block of text). text is a String or nil if the macro is

        #   invoked without a block of text.  

        #

        # Examples:

        # By default, when the macro is invoked, the coma separated list of arguments

        # is split and passed to the macro block as an array. If no argument is given

        # the macro will be invoked with an empty array:

        #

        #   macro :my_macro do |obj, args|

        #     # args is an array

        #     # and this macro do not accept a block of text

        #   end

        #

        # You can disable arguments spliting with the :parse_args => false option. In

        # this case, the full string of arguments is passed to the macro:

        #

        #   macro :my_macro, :parse_args => false do |obj, args|

        #     # args is a string

        #   end

        #

        # Macro can optionally accept a block of text:

        #

        #   macro :my_macro do |obj, args, text|

        #     # this macro accepts a block of text

        #   end

        #

        # Macros are invoked in formatted text using double curly brackets. Arguments

        # must be enclosed in parenthesis if any. A new line after the macro name or the

        # arguments starts the block of text that will be passe to the macro (invoking

        # a macro that do not accept a block of text with some text will fail).

        # Examples:

        #

        #   No arguments:

        #   {{my_macro}}

        #

        #   With arguments:

        #   {{my_macro(arg1, arg2)}}

        #

        #   With a block of text:

        #   {{my_macro

        #   multiple lines

        #   of text

        #   }}

        #

        #   With arguments and a block of text

        #   {{my_macro(arg1, arg2)

        #   multiple lines

        #   of text

        #   }}

        #

        # If a block of text is given, the closing tag }} must be at the start of a new line.

        def macro(name, options={}, &block)

          options.assert_valid_keys(:desc, :parse_args)

          unless name.to_s.match(/\A\w+\z/)

            raise "Invalid macro name: #{name} (only 0-9, A-Z, a-z and _ characters are accepted)"

          end

          unless block_given?

            raise "Can not create a macro without a block!"

          end

          name = name.to_s.downcase.to_sym

          available_macros[name] = {:desc => @@desc || ''}.merge(options)

          @@desc = nil

          Definitions.send :define_method, "macro_#{name}", &block

        end

        # Sets description for the next macro to be defined

        def desc(txt)

          @@desc = txt

        end

      end

      # Builtin macros

      desc "Sample macro."

      macro :hello_world do |obj, args, text|

        h("Hello world! Object: #{obj.class.name}, " + 

          (args.empty? ? "Called with no argument" : "Arguments: #{args.join(', ')}") +

          " and " + (text.present? ? "a #{text.size} bytes long block of text." : "no block of text.")

        )

      end

      desc "Displays a list of all available macros, including description if available."

      macro :macro_list do |obj, args|

        out = ''.html_safe

        @@available_macros.each do |macro, options|

          out << content_tag('dt', content_tag('code', macro.to_s))

          out << content_tag('dd', textilizable(options[:desc]))

        end

        content_tag('dl', out)

      end

      desc "Displays a list of child pages. With no argument, it displays the child pages of the current wiki page. Examples:\n\n" +

             "  !{{child_pages}} -- can be used from a wiki page only\n" +

             "  !{{child_pages(depth=2)}} -- display 2 levels nesting only\n"

             "  !{{child_pages(Foo)}} -- lists all children of page Foo\n" +

             "  !{{child_pages(Foo, parent=1)}} -- same as above with a link to page Foo"

      macro :child_pages do |obj, args|

        args, options = extract_macro_options(args, :parent, :depth)

        options[:depth] = options[:depth].to_i if options[:depth].present?

        page = nil

        if args.size > 0

          page = Wiki.find_page(args.first.to_s, :project => @project)

        elsif obj.is_a?(WikiContent) || obj.is_a?(WikiContent::Version)

          page = obj.page

        else

          raise 'With no argument, this macro can be called from wiki pages only.'

        end

        raise 'Page not found' if page.nil? || !User.current.allowed_to?(:view_wiki_pages, page.wiki.project)

        pages = page.self_and_descendants(options[:depth]).group_by(&:parent_id)

        render_page_hierarchy(pages, options[:parent] ? page.parent_id : page.id)

      end

      desc "Include a wiki page. Example:\n\n  !{{include(Foo)}}\n\nor to include a page of a specific project wiki:\n\n  !{{include(projectname:Foo)}}"

      macro :include do |obj, args|

        page = Wiki.find_page(args.first.to_s, :project => @project)

        raise 'Page not found' if page.nil? || !User.current.allowed_to?(:view_wiki_pages, page.wiki.project)

        @included_wiki_pages ||= []

        raise 'Circular inclusion detected' if @included_wiki_pages.include?(page.title)

        @included_wiki_pages << page.title

        out = textilizable(page.content, :text, :attachments => page.attachments, :headings => false)

        @included_wiki_pages.pop

        out

      end

      desc "Inserts of collapsed block of text. Example:\n\n  {{collapse(View details...)\nThis is a block of text that is collapsed by default.\nIt can be expanded by clicking a link.\n}}"

      macro :collapse do |obj, args, text|

        html_id = "collapse-#{Redmine::Utils.random_hex(4)}"

        show_label = args[0] || l(:button_show)

        hide_label = args[1] || args[0] || l(:button_hide)

        js = "$('##{html_id}-show, ##{html_id}-hide').toggle(); $('##{html_id}').fadeToggle(150);"

        out = ''.html_safe

        out << link_to_function(show_label, js, :id => "#{html_id}-show", :class => 'collapsible collapsed')

        out << link_to_function(hide_label, js, :id => "#{html_id}-hide", :class => 'collapsible', :style => 'display:none;')

        out << content_tag('div', textilizable(text, :object => obj), :id => html_id, :class => 'collapsed-text', :style => 'display:none;')

        out

      end

      desc "Displays a clickable thumbnail of an attached image. Examples:\n\n<pre>{{thumbnail(image.png)}}\n{{thumbnail(image.png, size=300, title=Thumbnail)}}</pre>"

      macro :thumbnail do |obj, args|

        args, options = extract_macro_options(args, :size, :title)

        filename = args.first

        raise 'Filename required' unless filename.present?

        size = options[:size]

        raise 'Invalid size parameter' unless size.nil? || size.match(/^\d+$/)

        size = size.to_i

        size = nil unless size > 0

        if obj && obj.respond_to?(:attachments) && attachment = Attachment.latest_attach(obj.attachments, filename)

          title = options[:title] || attachment.title

          img = image_tag(url_for(:controller => 'attachments', :action => 'thumbnail', :id => attachment, :size => size), :alt => attachment.filename)

          link_to(img, url_for(:controller => 'attachments', :action => 'show', :id => attachment), :class => 'thumbnail', :title => title)

        else

          raise "Attachment #{filename} not found"

        end

      end

    end

  end

end