# The MIT License
# Copyright © 2009 Magnus Bergmark
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

#
# Monitor takes care of monitoring a specific directory for changes and then notifying a specified
# instance about the changes later on.
#
class GitRemoteMonitor::Monitor
  attr_reader :name, :directory
  
  def initialize(directory, interval, notifier, name = nil)
    @directory = directory
    @name      = name || File.basename(directory)
    @interval  = interval.to_i
    @notifier  = notifier
    
    self.class.move_to_directory!(@directory)
  end
  
  def start_monitoring!
    loop do
      notify! if GitRemoteMonitor::GitWrapper.fetch!
      sleep @interval
      break unless should_loop_monitoring?
    end
  end
  
  protected
    
    # This method is added only for easier testing. Might be usable in the future, though.
    def should_loop_monitoring?
      true
    end
    
    def notify!
      # Find out the status
      local = GitRemoteMonitor::GitWrapper.local_branch
      remote = GitRemoteMonitor::GitWrapper.remote_branch
      my_commits, their_commits = GitRemoteMonitor::GitWrapper.get_tracking_info(local, remote)
      @notifier.notify_commits(self, local, my_commits, their_commits)
    end
    
    def self.move_to_directory!(directory)
      unless File.exist?(directory) and File.directory?(directory)
        raise "#{directory} not found or not a directory"
      end
      Dir.chdir(directory)
      raise "#{File.expand_path(directory)} is not part of a git repository" unless GitRemoteMonitor::GitWrapper.in_repo?
    end
    
  
end