module FeedsController

  def show_feeds(feeds=[])
    @all_feeds ||= feeds
    # So we can redisplay them after exiting a search subset
    begin 

      @command_window = CommandWindow.new(@scr)
      @items = @all_feeds

      @scr.refresh # or else the initial screen is blank, I don't know why yet

      @content_area = MenuWindow.new("Your Feeds", @scr, @all_feeds, @current_feed_index || 0)
      @command_window.help_prompt

      loop do
        parse_feeds_list_command
      end
    end
  end

  def parse_feeds_list_command
    c = @scr.getch
    # store number in buffer, vim style
    c, buffer = key_buffer(c)
    multiplier = buffer.empty? ? 1 : buffer.join.to_i
    LOGGER.debug("Char: #{c}")
    LOGGER.debug("Multiplier: #{multiplier}")

    case c
    when ?\? # help
      show_help(CursesController::FEEDS_MENU_COMMANDS)
      # Any key restores the menu
      redraw

    when ?\u # UPDATE FEEDS

      @current_feed = @items[@content_area.current_index]
      num = @command_window.feed_update_progress(@current_feed)
     
      if num > 0
        @scr.getch
        redraw
      end

    when ?\U # UPDATE FEEDS, forcing update even if soon after last update

      @current_feed = @items[@content_area.current_index]
      num = @command_window.feed_update_progress(@current_feed, true)
      
      if num > 0
        @scr.getch
        redraw
      end

    when control_key('U') # UPDATE ALL FEEDS

      num = 0
      @all_feeds.each do |feed| 
        num += (@command_window.feed_update_progress(feed) || 0)
      end
      @command_window.message("#{num} new items.")

    when ?\d # delete feed

      @current_feed = @items[@content_area.current_index]
      if @current_feed.is_a?(VirtualFeed)
        @command_window.command_line = "You can't delete a virtual feed!"
        @command_window.draw
        return
      end

      if @command_window.confirm_delete_feed(@current_feed) == ?\y
        title = @current_feed.title
        @current_feed.destroy
        @command_window.command_line = "The #{title} feed has been deleted"

        @current_index = @content_area.current_index - 1
        feeds = Feed.feeds_list
        redraw(feeds)
      else
        @command_window.command_line = "Canceled."
      end
      @command_window.draw

    when 97 # ?\a # add feed

      if (new_feed = @command_window.add_feed)

        # redraw feeds list
        feed_list = Feed.feeds_list
        @current_index = feed_list.index(new_feed)
        redraw(feed_list)
      end
      @command_window.draw

    when ?\q
      # cancel search
      # TODO change
      if @command_window && @command_window.command_line == 'Press q to cancel search.'
        cancel_search
      else
        exit
      end
    # SEARCH. This is a global search that generates a virtual feed
    when ?\/

      @command_window ||= CommandWindow.new( @scr ) 

      @global_search_string = @command_window.get_search_string
      if @global_search_string == '' || @global_search_string =~ /^\W*$/
        @command_window.command_line = "Found no matches"
      end

      matches = search_feeds(@global_search_string.strip)
      if matches.nil? || matches.empty?
        @command_window.command_line = "Found no matches"
      end
 
      if matches
        # create a virtual feed
        @items = @current_entries = matches

        @entries_list_matches = nil

        @current_entry_index = 0
        @content_area.close
        @content_area = nil
        show_entries

      else
        @command_window.draw
      end
      
    when Key::LEFT, Key::UP, ?k, ?p
      @content_area.prev_item(multiplier)
    when Key::DOWN, ?j, ?\s, ?n
      @content_area.next_item(multiplier)
    when Key::RESIZE
      redraw(false)
    when Key::RIGHT, ?l, 10 # Enter key

      # You can type a number and press enter or right arrow to select a feed by
      # number.
      unless buffer && buffer.empty? 
        selection = buffer.join.to_i
        # set feed
        @current_feed = @items[selection - 1]
        @current_feed_index = selection - 1
        @content_area.current_index = selection - 1

      else
        @current_feed = @items[@content_area.current_index]
        @current_feed_index = @content_area.current_index
      end
      # set current entry index to 0
      @current_entry_index = 0

      LOGGER.debug("Selected feed #{@current_feed.title}")

      # Regular Feeds and Virtual Feeds have same interface 
      @items = @current_entries = @current_feed.is_a?(VirtualFeed) ? @current_feed.entries : 
        @current_feed.entries.find(:all, :include => :feed)

      # Show the entry content

      @entries_list_matches = nil
      @current_entry_index = 0
      @content_area.close
      @content_area = nil
      show_entries

    when 'M'[0] # middle of screen
      @content_area.middle
    when 'L'[0] # bottom of screen
      @content_area.bottom
    when 'H'[0] # top of screen
      @content_area.top
    when 'G'[0] # beginning or end of list
      if buffer.last == 1
        @content_area.end
      else
        @content_area.beginning
      end
    when control_key('F')
      @content_area.next_page
    when control_key('B')
      @content_area.prev_page
    else
      # don't do anything
    end
  end

  # This reloads the feeds (if items are provided) and redraws the content window
  def redraw(new_items =nil)
    @items = new_items ? (@all_feeds = new_items) : @content_area.items 
    unless new_items
      @current_index = @content_area.current_index 
    end
    @content_area.close
    @content_area = MenuWindow.new("Your Feeds", @scr, @items, @current_index)
  end

  # This is a global search of all feed entries 
  def search_feeds(global_search_string)
    if global_search_string == ''
      @command_window.clear
      return
    end
    
    # maybe change this to ferret or something later
    # TODO
    LOGGER.debug("search query: title LIKE '%#{global_search_string}%' or content LIKE '%#{global_search_string}%'")
    matches = Entry.find(:all,
                         :include => :feed,
                        :conditions => "title LIKE '%#{global_search_string}%'",
                         :order => "id desc")

    # We give priority to title matches
    matches.concat Entry.find(:all, 
                             :include => :feed,
                               :conditions => "content LIKE '%#{global_search_string}%'",
                               :order => "id desc")
    # There might very well be duplicates, so compress
    matches.uniq!
    if matches.empty?
      @command_window.command_line = "Found no matches for search string '#{global_search_string}'"
      @command_window.draw
      nil
    else
      @command_window.command_line = "Found #{matches.size} entries for search string '#{global_search_string}'. Displaying..." 
      @command_window.draw
      sleep 1

      matches
    end
  end

end