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# Redmine - project management software

# Copyright (C) 2006-2013  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.

require 'fileutils'

module Redmine

  module Thumbnail

    extend Redmine::Utils::Shell

    CONVERT_BIN = (Redmine::Configuration['imagemagick_convert_command'] || 'convert').freeze

    # Generates a thumbnail for the source image to target

    def self.generate(source, target, size)

      return nil unless convert_available?

      unless File.exists?(target)

        directory = File.dirname(target)

        unless File.exists?(directory)

          FileUtils.mkdir_p directory

        end

        size_option = "#{size}x#{size}>"

        cmd = "#{shell_quote CONVERT_BIN} #{shell_quote source} -thumbnail #{shell_quote size_option} #{shell_quote target}"

        unless system(cmd)

          logger.error("Creating thumbnail failed (#{$?}):\nCommand: #{cmd}")

          return nil

        end

      end

      target

    end

    def self.convert_available?

      return @convert_available if defined?(@convert_available)

      @convert_available = system("#{shell_quote CONVERT_BIN} -version") rescue false

      logger.warn("Imagemagick's convert binary (#{CONVERT_BIN}) not available") unless @convert_available

      @convert_available

    end

    def self.logger

      Rails.logger

    end

  end

end