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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 Themes

    # Return an array of installed themes

    def self.themes

      @@installed_themes ||= scan_themes

    end

    # Rescan themes directory

    def self.rescan

      @@installed_themes = scan_themes

    end

    # Return theme for given id, or nil if it's not found

    def self.theme(id, options={})

      return nil if id.blank?

      found = themes.find {|t| t.id == id}

      if found.nil? && options[:rescan] != false

        rescan

        found = theme(id, :rescan => false)

      end

      found

    end

    # Class used to represent a theme

    class Theme

      attr_reader :path, :name, :dir

      def initialize(path)

        @path = path

        @dir = File.basename(path)

        @name = @dir.humanize

        @stylesheets = nil

        @javascripts = nil

      end

      # Directory name used as the theme id

      def id; dir end

      def ==(theme)

        theme.is_a?(Theme) && theme.dir == dir

      end

      def <=>(theme)

        name <=> theme.name

      end

      def stylesheets

        @stylesheets ||= assets("stylesheets", "css")

      end

      def images

        @images ||= assets("images")

      end

      def javascripts

        @javascripts ||= assets("javascripts", "js")

      end

      def stylesheet_path(source)

        "/themes/#{dir}/stylesheets/#{source}"

      end

      def image_path(source)

        "/themes/#{dir}/images/#{source}"

      end

      def javascript_path(source)

        "/themes/#{dir}/javascripts/#{source}"

      end

      private

      def assets(dir, ext=nil)

        if ext

          Dir.glob("#{path}/#{dir}/*.#{ext}").collect {|f| File.basename(f).gsub(/\.#{ext}$/, '')}

        else

          Dir.glob("#{path}/#{dir}/*").collect {|f| File.basename(f)}

        end

      end

    end

    private

    def self.scan_themes

      dirs = Dir.glob("#{Rails.public_path}/themes/*").select do |f|

        # A theme should at least override application.css

        File.directory?(f) && File.exist?("#{f}/stylesheets/application.css")

      end

      dirs.collect {|dir| Theme.new(dir)}.sort

    end

  end

end

module ApplicationHelper

  def current_theme

    unless instance_variable_defined?(:@current_theme)

      @current_theme = Redmine::Themes.theme(Setting.ui_theme)

    end

    @current_theme

  end

  # Returns the header tags for the current theme

  def heads_for_theme

    if current_theme && current_theme.javascripts.include?('theme')

      javascript_include_tag current_theme.javascript_path('theme')

    end

  end

end