module Rwiki::Utils
  class FileHelper

    attr_reader :path

    def initialize(path)
      @path = self.class.sanitize_path(path)
    end

    def file_path
      [path, Rwiki.configuration.page_file_extension].join('.')
    end

    def full_path
      self.class.expand_node_path(path)
    end

    def full_file_path
      [full_path, Rwiki.configuration.page_file_extension].join('.')
    end

    def full_parent_path
      File.dirname(full_path)
    end

    def basename
      File.basename(path)
    end

    def exists?
      File.exists?(full_file_path)
    end

    def read_file_content
      File.open(full_file_path, 'r:UTF-8') { |f| f.read }
    end

    def update_file_content(content)
      File.open(full_file_path, 'w:UTF-8') { |f| f.write(content) }
    end

    def add_page(name)
      new_file_full_path = File.join(full_path, name)
      new_file_full_path += '.txt' unless name.end_with?(".#{Rwiki.configuration.page_file_extension}")

      FileUtils.mkdir_p(full_path) unless Dir.exists?(full_path)
      File.open(new_file_full_path, 'w') { |f| f.write("h1. #{name}\n\n") }
      new_file_full_path
    end

    def delete
      FileUtils.rm_rf(full_path)
      FileUtils.rm_rf("#{full_path}.txt")
    end

    def rename_to(new_name)
      new_name.gsub!(/\.#{Rwiki.configuration.page_file_extension}$/, '')
      new_full_path = File.join(full_parent_path, new_name)

      unless File.exists?(new_full_path)
        FileUtils.mv(full_path, new_full_path) if Dir.exists?(full_path)
        FileUtils.mv(full_file_path, "#{new_full_path}.#{Rwiki.configuration.page_file_extension}")

        @path = self.class.sanitize_path(new_full_path)
        true
      else
        false
      end
    end

    def move_to(new_parent_path)
      new_parent_full_path = self.class.expand_node_path(new_parent_path)
      return false if new_parent_full_path == full_path

      new_parent_file_full_path = self.class.expand_node_file_path(new_parent_path)
      if File.exists?(new_parent_file_full_path)
        FileUtils.mkdir(new_parent_full_path) unless Dir.exists?(new_parent_full_path)

        FileUtils.mv(full_path, new_parent_full_path) if Dir.exists?(full_path)
        FileUtils.mv(full_file_path, new_parent_full_path)

        @path = File.join(new_parent_path, basename)
        true
      else
        false
      end
    end

    def self.sanitize_path(path)
      sanitized_path = path.clone

      sanitized_path = '/' + sanitized_path unless sanitized_path.start_with?('/')
      # remove the page file extension
      sanitized_path.gsub!(/\.#{Rwiki.configuration.page_file_extension}$/, '')
      # remove the rwiki path
      sanitized_path.sub!(Rwiki.configuration.rwiki_path, '') if path.start_with?(Rwiki.configuration.rwiki_path)

      sanitized_path
    end

    def self.expand_node_path(path)
      File.join(Rwiki.configuration.rwiki_path, sanitize_path(path))
    end

    def self.expand_node_file_path(path)
      "#{expand_node_path(path)}.#{Rwiki.configuration.page_file_extension}"
    end

    def self.create_home_page!
      return if File.exists?(Rwiki.configuration.root_page_full_file_path)

      FileUtils.mkdir_p(Rwiki.configuration.rwiki_path)
      FileUtils.touch(Rwiki.configuration.root_page_full_file_path)
    end

  end
end