class StatsController < ApplicationController

  helper :todos

  append_before_filter :init, :exclude => []
  
  def index
    @page_title = 'TRACKS::Statistics'

    @tags_count = get_total_number_of_tags_of_user
    @unique_tags_count = get_unique_tags_of_user.count
    @hidden_contexts = @contexts.hidden
    @first_action = @actions.find(:first, :order => "created_at ASC")
    
    get_stats_actions
    get_stats_contexts
    get_stats_projects
    get_stats_tags   
      
    render :layout => 'standard'
  end  
  
  def actions_done_last12months_data
    @actions = @user.todos
       
    # get actions created and completed in the past 12+3 months. +3 for running
    #   average
    @actions_done_last12months = @actions.find(:all, {
        :select => "completed_at",
        :conditions => ["completed_at > ? AND completed_at IS NOT NULL", @cut_off_year_plus3]
      })
    @actions_created_last12months = @actions.find(:all, {
        :select => "created_at",
        :conditions => ["created_at > ?", @cut_off_year_plus3]
      })
    
    # convert to hash to be able to fill in non-existing days in
    #   @actions_done_last12months and count the total actions done in the past
    #   12 months to be able to calculate percentage
    
    # use 0 to initialise action count to zero
    @actions_done_last12months_hash = Hash.new(0) 
    @actions_done_last12months.each do |r|      
      months = (@today.year - r.completed_at.year)*12 + (@today.month - r.completed_at.month)

      @actions_done_last12months_hash[months] += 1
    end
        
    # convert to hash to be able to fill in non-existing days in
    #   @actions_created_last12months and count the total actions done in the
    #   past 12 months to be able to calculate percentage

    # use 0 to initialise action count to zero
    @actions_created_last12months_hash = Hash.new(0)
    @actions_created_last12months.each do |r|      
      months = (@today.year - r.created_at.year)*12 + (@today.month - r.created_at.month)
      
      @actions_created_last12months_hash[months] += 1
    end

    @sum_actions_done_last12months=0
    @sum_actions_created_last12months=0

    # find max for graph in both hashes
    @max=0
    0.upto 13 do |i|             
      @sum_actions_done_last12months += @actions_done_last12months_hash[i] 
      @max = @actions_done_last12months_hash[i] if @actions_done_last12months_hash[i] > @max
    end
    0.upto 13 do |i| 
      @sum_actions_created_last12months += @actions_created_last12months_hash[i]
      @max = @actions_created_last12months_hash[i] if @actions_created_last12months_hash[i] > @max
    end
    
    # find running avg for month i by calculating avg of month i and the two
    #   after them. Ignore current month because you do not have full data for
    #   it
    @actions_done_avg_last12months_hash = Hash.new("null")
    1.upto(12) { |i| 
      @actions_done_avg_last12months_hash[i] = (@actions_done_last12months_hash[i] +
          @actions_done_last12months_hash[i+1] + 
          @actions_done_last12months_hash[i+2])/3.0
    }    

    # find running avg for month i by calculating avg of month i and the two
    #   after them. Ignore current month because you do not have full data for
    #   it
    @actions_created_avg_last12months_hash = Hash.new("null")
    1.upto(12) { |i| 
      @actions_created_avg_last12months_hash[i] = (@actions_created_last12months_hash[i] +
          @actions_created_last12months_hash[i+1] + 
          @actions_created_last12months_hash[i+2])/3.0
    }    
    
    # interpolate avg for this month. Assume 31 days in this month
    days_passed_this_month = Time.new.day/1.0
    @interpolated_actions_created_this_month = (
      @actions_created_last12months_hash[0]/days_passed_this_month*31.0+
        @actions_created_last12months_hash[1]+
        @actions_created_last12months_hash[2]) / 3.0
  
    @interpolated_actions_done_this_month = (
      @actions_done_last12months_hash[0]/days_passed_this_month*31.0 +
        @actions_done_last12months_hash[1]+
        @actions_done_last12months_hash[2]) / 3.0
    
    render :layout => false
  end
  
  def actions_done_last_years
    @chart_width = 900
    @chart_height = 400
  end
  
  def actions_done_lastyears_data
    @actions = @user.todos
       
    # get actions created and completed in the past 12+3 months. +3 for running
    #   average
    @actions_done_last_months = @actions.find(:all, {
        :select => "completed_at",
        :conditions => ["completed_at IS NOT NULL"]
      })
    @actions_created_last_months = @actions.find(:all, {
        :select => "created_at",
      })
    
    @month_count = 0
    
    # convert to hash to be able to fill in non-existing days in
    #   @actions_done_last12months and count the total actions done in the past
    #   12 months to be able to calculate percentage
    
    # use 0 to initialise action count to zero
    @actions_done_last_months_hash = Hash.new(0) 
    @actions_done_last_months.each do |r|      
      months = (@today.year - r.completed_at.year)*12 + (@today.month - r.completed_at.month)
      @month_count = months if months > @month_count
      @actions_done_last_months_hash[months] += 1
    end
        
    # convert to hash to be able to fill in non-existing days in
    #   @actions_created_last12months and count the total actions done in the
    #   past 12 months to be able to calculate percentage

    # use 0 to initialise action count to zero
    @actions_created_last_months_hash = Hash.new(0)
    @actions_created_last_months.each do |r|
      months = (@today.year - r.created_at.year)*12 + (@today.month - r.created_at.month)
      @month_count = months if months > @month_count
      @actions_created_last_months_hash[months] += 1
    end

    @sum_actions_done_last_months=0
    @sum_actions_created_last_months=0

    # find max for graph in both hashes
    @max=0
    0.upto @month_count do |i|
      @sum_actions_done_last_months += @actions_done_last_months_hash[i] 
      @max = @actions_done_last_months_hash[i] if @actions_done_last_months_hash[i] > @max
    end
    0.upto @month_count do |i| 
      @sum_actions_created_last_months += @actions_created_last_months_hash[i]
      @max = @actions_created_last_months_hash[i] if @actions_created_last_months_hash[i] > @max
    end
    
    # find running avg for month i by calculating avg of month i and the two
    #   after them. Ignore current month because you do not have full data for
    #   it
    @actions_done_avg_last_months_hash = Hash.new("null")
    1.upto(@month_count) { |i| 
      @actions_done_avg_last_months_hash[i] = (@actions_done_last_months_hash[i] +
          @actions_done_last_months_hash[i+1] + 
          @actions_done_last_months_hash[i+2])/3.0
    }
    # correct last two months
    @actions_done_avg_last_months_hash[@month_count] = @actions_done_avg_last_months_hash[@month_count] * 3
    @actions_done_avg_last_months_hash[@month_count-1] = @actions_done_avg_last_months_hash[@month_count-1] * 3 / 2 if @month_count > 1

    # find running avg for month i by calculating avg of month i and the two
    #   after them. Ignore current month because you do not have full data for
    #   it
    @actions_created_avg_last_months_hash = Hash.new("null")
    1.upto(@month_count) { |i| 
      @actions_created_avg_last_months_hash[i] = (@actions_created_last_months_hash[i] +
          @actions_created_last_months_hash[i+1] + 
          @actions_created_last_months_hash[i+2])/3.0
    }    
    # correct last two months
    @actions_created_avg_last_months_hash[@month_count] = @actions_created_avg_last_months_hash[@month_count] * 3
    @actions_created_avg_last_months_hash[@month_count-1] = @actions_created_avg_last_months_hash[@month_count-1] * 3 / 2 if @month_count > 1
    
    # interpolate avg for this month. Assume 31 days in this month
    days_passed_this_month = Time.new.day/1.0
    @interpolated_actions_created_this_month = (
      @actions_created_last_months_hash[0]/days_passed_this_month*31.0+
        @actions_created_last_months_hash[1]+
        @actions_created_last_months_hash[2]) / 3.0
  
    @interpolated_actions_done_this_month = (
      @actions_done_last_months_hash[0]/days_passed_this_month*31.0 +
        @actions_done_last_months_hash[1]+
        @actions_done_last_months_hash[2]) / 3.0
    
    render :layout => false
  end

  
  def actions_done_last30days_data
    # get actions created and completed in the past 30 days.
    @actions_done_last30days = @actions.find(:all, {
        :select => "completed_at",
        :conditions => ["completed_at > ? AND completed_at IS NOT NULL", @cut_off_month]
      })
    @actions_created_last30days = @actions.find(:all, {
        :select => "created_at",
        :conditions => ["created_at > ?", @cut_off_month]
      })
    
    # convert to hash to be able to fill in non-existing days in
    #   @actions_done_last30days and count the total actions done in the past 30
    #   days to be able to calculate percentage
    @sum_actions_done_last30days=0
    
    # use 0 to initialise action count to zero
    @actions_done_last30days_hash = Hash.new(0) 
    @actions_done_last30days.each do |r|
      # only use date part of completed_at
      action_date = Time.utc(r.completed_at.year, r.completed_at.month, r.completed_at.day, 0,0)
      days = ((@today - action_date) / @seconds_per_day).to_i

      @actions_done_last30days_hash[days] += 1
      @sum_actions_done_last30days+=1      
    end
        
    # convert to hash to be able to fill in non-existing days in
    #   @actions_done_last30days and count the total actions done in the past 30
    #   days to be able to calculate percentage
    @sum_actions_created_last30days=0

    # use 0 to initialise action count to zero
    @actions_created_last30days_hash = Hash.new(0)
    @actions_created_last30days.each do |r|
      # only use date part of created_at
      action_date = Time.utc(r.created_at.year, r.created_at.month, r.created_at.day, 0,0)
      days = ((@today - action_date) / @seconds_per_day).to_i
      
      @actions_created_last30days_hash[days] += 1
      @sum_actions_created_last30days += 1
    end

    # find max for graph in both hashes
    @max=0
    0.upto(30) { |i| @max = @actions_done_last30days_hash[i] if @actions_done_last30days_hash[i] > @max }   
    0.upto(30) { |i| @max = @actions_created_last30days_hash[i] if @actions_created_last30days_hash[i] > @max }
      
    render :layout => false
  end

  def actions_completion_time_data
    @actions_completion_time = @actions.find(:all, {
        :select => "completed_at, created_at",
        :conditions => "completed_at IS NOT NULL"
      })
    
    # convert to hash to be able to fill in non-existing days in
    #   @actions_completion_time also convert days to weeks (/7)
       
    @max_days, @max_actions, @sum_actions=0,0,0
    @actions_completion_time_hash = Hash.new(0)
    @actions_completion_time.each do |r|
      days = (r.completed_at - r.created_at) / @seconds_per_day
      weeks = (days/7).to_i
      @actions_completion_time_hash[weeks] += 1     

      @max_days=days if days > @max_days
      @max_actions = @actions_completion_time_hash[weeks] if @actions_completion_time_hash[weeks] > @max_actions      
      @sum_actions += 1
    end
    
    # stop the chart after 10 weeks
    @cut_off = 10
          
    render :layout => false
  end

  def actions_running_time_data
    @actions_running_time = @actions.find(:all, {
        :select => "created_at",
        :conditions => "completed_at IS NULL"
      })

    # convert to hash to be able to fill in non-existing days in
    #   @actions_running_time also convert days to weeks (/7)
           
    @max_days, @max_actions, @sum_actions=0,0,0
    @actions_running_time_hash = Hash.new(0)
    @actions_running_time.each do |r|
      days = (@today - r.created_at) / @seconds_per_day
      weeks = (days/7).to_i

      @actions_running_time_hash[weeks] += 1
      
      @max_days=days if days > @max_days
      @max_actions = @actions_running_time_hash[weeks] if @actions_running_time_hash[weeks] > @max_actions
      @sum_actions += 1
    end
                    
    # cut off chart at 52 weeks = one year
    @cut_off=52
            
    render :layout => false
  end

  def actions_visible_running_time_data
    # running means
    # - not completed (completed_at must be null) visible means
    # - actions not part of a hidden project
    # - actions not part of a hidden context
    # - actions not deferred (show_from must be null)
    
    @actions_running_time = @actions.find_by_sql([
        "SELECT t.created_at "+
          "FROM todos t LEFT OUTER JOIN projects p ON t.project_id = p.id LEFT OUTER JOIN contexts c ON t.context_id = c.id "+
          "WHERE t.user_id=? "+
          "AND t.completed_at IS NULL " +
          "AND t.show_from IS NULL " +
          "AND NOT (p.state='hidden' OR c.hide=?) " +
          "ORDER BY t.created_at ASC", @user.id, true]
    )
    
    # convert to hash to be able to fill in non-existing days in
    # @actions_running_time also convert days to weeks (/7)
           
    @max_days, @max_actions, @sum_actions=0,0,0
    @actions_running_time_hash = Hash.new(0)
    @actions_running_time.each do |r|
      days = (@today - r.created_at) / @seconds_per_day
      weeks = (days/7).to_i
      # RAILS_DEFAULT_LOGGER.error("\n" + total.to_s + " - " + days + "\n")
      @actions_running_time_hash[weeks] += 1
      
      @max_days=days if days > @max_days
      @max_actions = @actions_running_time_hash[weeks] if @actions_running_time_hash[weeks] > @max_actions
      @sum_actions += 1
    end
                    
    # cut off chart at 52 weeks = one year
    @cut_off=52
            
    render :layout => false
  end

  
  def context_total_actions_data
    # get total action count per context Went from GROUP BY c.id to c.name for
    # compatibility with postgresql. Since the name is forced to be unique, this
    # should work.
    @all_actions_per_context = @contexts.find_by_sql(
      "SELECT c.name AS name, c.id as id, count(*) AS total "+
        "FROM contexts c, todos t "+
        "WHERE t.context_id=c.id "+
        "AND t.user_id="+@user.id.to_s+" "+
        "GROUP BY c.name, c.id "+
        "ORDER BY total DESC"
    )

    pie_cutoff=10
    size = @all_actions_per_context.size()
    size = pie_cutoff if size > pie_cutoff
    @actions_per_context = Array.new(size)
    0.upto size-1 do |i|
      @actions_per_context[i] = @all_actions_per_context[i]
    end

    if size==pie_cutoff
      @actions_per_context[size-1]['name']='(others)'
      @actions_per_context[size-1]['total']=0
      @actions_per_context[size-1]['id']=-1
      (size-1).upto @all_actions_per_context.size()-1 do |i|
        @actions_per_context[size-1]['total']+=@all_actions_per_context[i]['total'].to_i
      end
    end
    
    @sum=0
    0.upto @all_actions_per_context.size()-1 do |i|
      @sum += @all_actions_per_context[i]['total'].to_i
    end
    
    @truncate_chars = 15            
    
    render :layout => false
  end

  def context_running_actions_data
    # get incomplete action count per visible context
    #
    # Went from GROUP BY c.id to c.name for compatibility with postgresql. Since
    # the name is forced to be unique, this should work.
    @all_actions_per_context = @contexts.find_by_sql(
      "SELECT c.name AS name, c.id as id, count(*) AS total "+
        "FROM contexts c, todos t "+
        "WHERE t.context_id=c.id AND t.completed_at IS NULL AND NOT c.hide "+
        "AND t.user_id="+@user.id.to_s+" "+
        "GROUP BY c.name, c.id "+
        "ORDER BY total DESC"
    )
    
    pie_cutoff=10
    size = @all_actions_per_context.size()
    size = pie_cutoff if size > pie_cutoff
    @actions_per_context = Array.new(size)
    0.upto size-1 do |i|
      @actions_per_context[i] = @all_actions_per_context[i]
    end

    if size==pie_cutoff
      @actions_per_context[size-1]['name']='(others)'
      @actions_per_context[size-1]['total']=0
      @actions_per_context[size-1]['id']=-1
      (size-1).upto @all_actions_per_context.size()-1 do |i|
        @actions_per_context[size-1]['total']+=@all_actions_per_context[i]['total'].to_i
      end
    end
    
    @sum=0
    0.upto @all_actions_per_context.size()-1 do |i|
      @sum += @all_actions_per_context[i]['total'].to_i
    end
            
    @truncate_chars = 15
    
    render :layout => false
  end

  def actions_day_of_week_all_data
    @actions = @user.todos
          
    @actions_creation_day = @actions.find(:all, {
        :select => "created_at"
      })
    
    @actions_completion_day = @actions.find(:all, {
        :select => "completed_at",
        :conditions => "completed_at IS NOT NULL" 
      })

    # convert to hash to be able to fill in non-existing days
    @actions_creation_day_array = Array.new(7) { |i| 0}
    @actions_creation_day.each do |t|
      # dayofweek: sunday=0..saterday=6
      dayofweek = t.created_at.wday
      @actions_creation_day_array[dayofweek] += 1
    end
    # find max
    @max=0
    0.upto(6) { |i| @max = @actions_creation_day_array[i] if @actions_creation_day_array[i] >  @max}
      

    # convert to hash to be able to fill in non-existing days
    @actions_completion_day_array = Array.new(7) { |i| 0}
    @actions_completion_day.each do |t|
      # dayofweek: sunday=0..saterday=6
      dayofweek = t.completed_at.wday
      @actions_completion_day_array[dayofweek] += 1
    end
    0.upto(6) { |i| @max = @actions_completion_day_array[i] if @actions_completion_day_array[i] >  @max}
                      
    render :layout => false
  end

  def actions_day_of_week_30days_data
    @actions_creation_day = @actions.find(:all, {
        :select => "created_at",
        :conditions => ["created_at > ?", @cut_off_month]
      })
        
    @actions_completion_day = @actions.find(:all, {
        :select => "completed_at",
        :conditions => ["completed_at IS NOT NULL AND completed_at > ?", @cut_off_month]
      })

    # convert to hash to be able to fill in non-existing days
    @max=0
    @actions_creation_day_array = Array.new(7) { |i| 0}
    @actions_creation_day.each do |r|
      # dayofweek: sunday=1..saterday=8
      dayofweek = r.created_at.wday
      @actions_creation_day_array[dayofweek] += 1
    end
    0.upto(6) { |i| @max = @actions_creation_day_array[i] if @actions_creation_day_array[i] >  @max}

    # convert to hash to be able to fill in non-existing days
    @actions_completion_day_array = Array.new(7) { |i| 0}
    @actions_completion_day.each do |r|
      # dayofweek: sunday=1..saterday=7
      dayofweek = r.completed_at.wday
      @actions_completion_day_array[dayofweek] += 1
    end
    0.upto(6) { |i| @max = @actions_completion_day_array[i] if @actions_completion_day_array[i] >  @max}
                      
    render :layout => false
  end

  def actions_time_of_day_all_data
    @actions_creation_hour = @actions.find(:all, {
        :select => "created_at"
      })    
    @actions_completion_hour = @actions.find(:all, {
        :select => "completed_at", 
        :conditions => "completed_at IS NOT NULL" 
      })

    # convert to hash to be able to fill in non-existing days
    @max=0
    @actions_creation_hour_array = Array.new(24) { |i| 0}
    @actions_creation_hour.each do |r|
      hour = r.created_at.hour
      @actions_creation_hour_array[hour] += 1
    end
    0.upto(23) { |i| @max = @actions_creation_hour_array[i] if @actions_creation_hour_array[i] >  @max}

    # convert to hash to be able to fill in non-existing days
    @actions_completion_hour_array = Array.new(24) { |i| 0}
    @actions_completion_hour.each do |r|              
      hour = r.completed_at.hour
      @actions_completion_hour_array[hour] += 1
    end
    0.upto(23) { |i| @max = @actions_completion_hour_array[i] if @actions_completion_hour_array[i] >  @max}
                      
    render :layout => false
  end

  def actions_time_of_day_30days_data
    @actions_creation_hour = @actions.find(:all, {
        :select => "created_at",
        :conditions => ["created_at > ?", @cut_off_month]
      })
        
    @actions_completion_hour = @actions.find(:all, {
        :select => "completed_at",
        :conditions => ["completed_at IS NOT NULL AND completed_at > ?", @cut_off_month]
      })

    # convert to hash to be able to fill in non-existing days
    @max=0
    @actions_creation_hour_array = Array.new(24) { |i| 0}
    @actions_creation_hour.each do |r|
      hour = r.created_at.hour
      @actions_creation_hour_array[hour] += 1
    end
    0.upto(23) { |i| @max = @actions_creation_hour_array[i] if @actions_creation_hour_array[i] >  @max}

    # convert to hash to be able to fill in non-existing days
    @actions_completion_hour_array = Array.new(24) { |i| 0}
    @actions_completion_hour.each do |r|              
      hour = r.completed_at.hour
      @actions_completion_hour_array[hour] += 1
    end
    0.upto(23) { |i| @max = @actions_completion_hour_array[i] if @actions_completion_hour_array[i] >  @max}
                      
    render :layout => false
  end
  
  def show_selected_actions_from_chart
    @page_title = "TRACKS::Action selection"
    @count = 99

    @source_view = 'stats'
    
    case params['id']
    when 'avrt', 'avrt_end' # actions_visible_running_time
      
      # HACK: because open flash chart uses & to denote the end of a parameter,
      # we cannot use URLs with multiple parameters (that would use &). So we
      # revert to using two id's for the same selection. avtr_end means that the
      # last bar of the chart is selected. avtr is used for all other bars
      
      week_from = params['index'].to_i
      week_to = week_from+1
      
      @chart_name = "actions_visible_running_time_data"
      @page_title = "Actions selected from week "
      @further = false
      if params['id'] == 'avrt_end'
        @page_title += week_from.to_s + " and further"
        @further = true
      else
        @page_title += week_from.to_s + " - " + week_to.to_s + ""
      end

      # get all running actions that are visible
      @actions_running_time = @actions.find_by_sql([
          "SELECT t.id, t.created_at "+
            "FROM todos t LEFT OUTER JOIN projects p ON t.project_id = p.id LEFT OUTER JOIN contexts c ON t.context_id = c.id "+
            "WHERE t.user_id=? "+
            "AND t.completed_at IS NULL " +
            "AND t.show_from IS NULL " +
            "AND NOT (p.state='hidden' OR c.hide=?) " +
            "ORDER BY t.created_at ASC", @user.id, true]
      )

      @selected_todo_ids, @count = get_ids_from(@actions_running_time, week_from, week_to, params['id']== 'avrt_end')            
      @actions = @user.todos       
      @selected_actions = @actions.find(:all, {
          :conditions => "id in (" + @selected_todo_ids + ")"
        })
      
      render :action => "show_selection_from_chart"
      
    when 'art', 'art_end'
      week_from = params['index'].to_i
      week_to = week_from+1
      
      @chart_name = "actions_running_time_data"
      @page_title = "Actions selected from week "
      @further = false
      if params['id'] == 'art_end'
        @page_title += week_from.to_s + " and further"
        @further = true
      else
        @page_title += week_from.to_s + " - " + week_to.to_s + ""
      end

      @actions = @user.todos
      # get all running actions
      @actions_running_time = @actions.find(:all, {
          :select => "id, created_at",
          :conditions => "completed_at IS NULL"
        })

      @selected_todo_ids, @count = get_ids_from(@actions_running_time, week_from, week_to, params['id']=='art_end')           
      @selected_actions = @actions.find(:all, {
          :conditions => "id in (" + @selected_todo_ids + ")"
        })
      
      render :action => "show_selection_from_chart"
    else
      # render error
      render_failure "404 NOT FOUND. Unknown query selected"
    end
  end

  private

  def get_unique_tags_of_user
    tag_ids = @actions.find_by_sql([
        "SELECT DISTINCT tags.id as id "+
          "FROM tags, taggings, todos "+
          "WHERE todos.user_id=? "+
          "AND tags.id = taggings.tag_id " +
          "AND taggings.taggable_id = todos.id ", current_user.id])
    tags_ids_s = tag_ids.map(&:id).sort.join(",")
    return Tag.find(:all, :conditions => "id in (" + tags_ids_s + ")")
  end

  def get_total_number_of_tags_of_user
    # same query as get_unique_tags_of_user except for the DISTINCT
    return @actions.find_by_sql([
        "SELECT tags.id as id "+
          "FROM tags, taggings, todos "+
          "WHERE todos.user_id=? "+
          "AND tags.id = taggings.tag_id " +
          "AND taggings.taggable_id = todos.id ", current_user.id]).count
  end

  def init
    @actions = @user.todos
    @projects = @user.projects
    @contexts = @user.contexts

    # default chart dimensions
    @chart_width=460
    @chart_height=250
    @pie_width=@chart_width
    @pie_height=325
  
    # get the current date wih time set to 0:0
    now = Time.new
    @today = Time.utc(now.year, now.month, now.day, 0,0)

    # define the number of seconds in a day
    @seconds_per_day = 60*60*24

    # define cut_off date and discard the time for a month, 3 months and a year
    cut_off_time = 13.months.ago()
    @cut_off_year = Time.utc(cut_off_time.year, cut_off_time.month, cut_off_time.day,0,0)

    cut_off_time = 16.months.ago()
    @cut_off_year_plus3 = Time.utc(cut_off_time.year, cut_off_time.month, cut_off_time.day,0,0)
        
    cut_off_time = 31.days.ago
    @cut_off_month = Time.utc(cut_off_time.year, cut_off_time.month, cut_off_time.day,0,0)
    
    cut_off_time = 91.days.ago
    @cut_off_3months = Time.utc(cut_off_time.year, cut_off_time.month, cut_off_time.day,0,0)
    
  end
  
  def get_stats_actions
    # time to complete
    @completed_actions = @actions.find(:all, {
        :select => "completed_at, created_at",
        :conditions => "completed_at IS NOT NULL",
      })
    
    actions_sum, actions_max, actions_min = 0,0,-1
    @completed_actions.each do |r|
      actions_sum += (r.completed_at - r.created_at)
      actions_max = (r.completed_at - r.created_at) if (r.completed_at - r.created_at) > actions_max

      actions_min = (r.completed_at - r.created_at) if actions_min == -1
      actions_min = (r.completed_at - r.created_at) if (r.completed_at - r.created_at) < actions_min
    end
    
    sum_actions = @completed_actions.size
    sum_actions = 1 if sum_actions==0
    
    @actions_avg_ttc = (actions_sum/sum_actions)/@seconds_per_day
    @actions_max_ttc = actions_max/@seconds_per_day
    @actions_min_ttc = actions_min/@seconds_per_day
    
    min_ttc_sec = Time.utc(2000,1,1,0,0)+actions_min
    @actions_min_ttc_sec = (min_ttc_sec).strftime("%H:%M:%S")
    @actions_min_ttc_sec = (actions_min / @seconds_per_day).round.to_s + " days " + @actions_min_ttc_sec if actions_min > @seconds_per_day

    
    # get count of actions created and actions done in the past 30 days.
    @sum_actions_done_last30days = @actions.count(:all, {
        :conditions => ["completed_at > ? AND completed_at IS NOT NULL", @cut_off_month] 
      })
    @sum_actions_created_last30days = @actions.count(:all, {
        :conditions => ["created_at > ?", @cut_off_month]
      })
    
    # get count of actions done in the past 12 months.
    @sum_actions_done_last12months = @actions.count(:all, {
        :conditions => ["completed_at > ? AND completed_at IS NOT NULL", @cut_off_year]
      })
    @sum_actions_created_last12months = @actions.count(:all, {
        :conditions => ["created_at > ?", @cut_off_year] 
      })    
  end

  def get_stats_contexts
    # get action count per context for TOP 5
    #
    # Went from GROUP BY c.id to c.id, c.name for compatibility with postgresql.
    # Since the name is forced to be unique, this should work.
    @actions_per_context = @contexts.find_by_sql(
      "SELECT c.id AS id, c.name AS name, count(*) AS total "+
        "FROM contexts c, todos t "+
        "WHERE t.context_id=c.id "+
        "AND t.user_id="+@user.id.to_s+" "+
        "GROUP BY c.id, c.name ORDER BY total DESC " +
        "LIMIT 5"
    )

    # get incomplete action count per visible context for TOP 5
    #
    # Went from GROUP BY c.id to c.id, c.name for compatibility with postgresql.
    # Since the name is forced to be unique, this should work.
    @running_actions_per_context = @contexts.find_by_sql(
      "SELECT c.id AS id, c.name AS name, count(*) AS total "+
        "FROM contexts c, todos t "+
        "WHERE t.context_id=c.id AND t.completed_at IS NULL AND NOT c.hide "+
        "AND t.user_id="+@user.id.to_s+" "+
        "GROUP BY c.id, c.name ORDER BY total DESC " +
        "LIMIT 5"
    )    
  end

  def get_stats_projects
    # get the first 10 projects and their action count (all actions)
    #
    # Went from GROUP BY p.id to p.name for compatibility with postgresql. Since
    # the name is forced to be unique, this should work.
    @projects_and_actions = @projects.find_by_sql(
      "SELECT p.id, p.name, count(*) AS count "+
        "FROM projects p, todos t "+
        "WHERE p.id = t.project_id "+
        "AND p.user_id="+@user.id.to_s+" "+
        "GROUP BY p.id, p.name "+
        "ORDER BY count DESC " +
        "LIMIT 10"
    )
    
    # get the first 10 projects with their actions count of actions that have
    # been created or completed the past 30 days
    
    # using GROUP BY p.name (was: p.id) for compatibility with Postgresql. Since
    # you cannot create two contexts with the same name, this will work.
    @projects_and_actions_last30days = @projects.find_by_sql([
        "SELECT p.id, p.name, count(*) AS count "+
          "FROM todos t, projects p "+
          "WHERE t.project_id = p.id AND "+
          "      (t.created_at > ? OR t.completed_at > ?) "+
          "AND p.user_id=? "+
          "GROUP BY p.id, p.name "+
          "ORDER BY count DESC " +
          "LIMIT 10", @cut_off_month, @cut_off_month, @user.id]
    )
    
    # get the first 10 projects and their running time (creation date versus
    # now())
    @projects_and_runtime_sql = @projects.find_by_sql(
      "SELECT id, name, created_at "+
        "FROM projects "+
        "WHERE state='active' "+
        "AND user_id="+@user.id.to_s+" "+
        "ORDER BY created_at ASC "+
        "LIMIT 10"
    )

    i=0
    @projects_and_runtime = Array.new(10, [-1, "n/a", "n/a"])
    @projects_and_runtime_sql.each do |r|
      days = (@today - r.created_at) / @seconds_per_day
      # add one so that a project that you just create returns 1 day
      @projects_and_runtime[i]=[r.id, r.name, days.to_i+1]
      i += 1
    end
    
  end
  
  def get_stats_tags
    # tag cloud code inspired by this article
    #  http://www.juixe.com/techknow/index.php/2006/07/15/acts-as-taggable-tag-cloud/

    levels=10
    # TODO: parameterize limit
    
    # Get the tag cloud for all tags for actions
    query = "SELECT tags.id, name, count(*) AS count"
    query << " FROM taggings, tags, todos"
    query << " WHERE tags.id = tag_id"
    query << " AND taggings.taggable_id = todos.id"
    query << " AND todos.user_id="+current_user.id.to_s+" "
    query << " AND taggings.taggable_type='Todo' "
    query << " GROUP BY tags.id, tags.name"
    query << " ORDER BY count DESC, name"
    query << " LIMIT 100"
    @tags_for_cloud = Tag.find_by_sql(query).sort_by { |tag| tag.name.downcase }
        
    max, @tags_min = 0, 0
    @tags_for_cloud.each { |t|
      max = t.count.to_i if t.count.to_i > max
      @tags_min = t.count.to_i if t.count.to_i < @tags_min
    }

    @tags_divisor = ((max - @tags_min) / levels) + 1

    # Get the tag cloud for all tags for actions
    query = "SELECT tags.id, tags.name AS name, count(*) AS count"
    query << " FROM taggings, tags, todos"
    query << " WHERE tags.id = tag_id"
    query << " AND todos.user_id=? "
    query << " AND taggings.taggable_type='Todo' "
    query << " AND taggings.taggable_id=todos.id "
    query << " AND (todos.created_at > ? OR "
    query << "      todos.completed_at > ?) "
    query << " GROUP BY tags.id, tags.name"
    query << " ORDER BY count DESC, name"
    query << " LIMIT 100"
    @tags_for_cloud_90days = Tag.find_by_sql(
      [query, current_user.id, @cut_off_3months, @cut_off_3months]
    ).sort_by { |tag| tag.name.downcase }

    max_90days, @tags_min_90days = 0, 0
    @tags_for_cloud_90days.each { |t|
      max_90days = t.count.to_i if t.count.to_i > max_90days
      @tags_min_90days = t.count.to_i if t.count.to_i < @tags_min_90days
    }

    @tags_divisor_90days = ((max_90days - @tags_min_90days) / levels) + 1
    
  end
  
  def get_ids_from (actions_running_time, week_from, week_to, at_end)
    count=0
    selected_todo_ids = ""
    
    actions_running_time.each do |r|
      days = (@today - r.created_at) / @seconds_per_day
      weeks = (days/7).to_i
      if at_end
        if weeks >= week_from
          selected_todo_ids += r.id.to_s+","
          count+=1            
        end
      else
        if weeks.between?(week_from, week_to-1)
          selected_todo_ids += r.id.to_s+","
          count+=1
        end
      end
    end
      
    # strip trailing comma
    selected_todo_ids = selected_todo_ids[0..selected_todo_ids.length-2]
    
    return selected_todo_ids, count
  end
  
end