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# encoding: utf-8

#

# 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.

module ActivitiesHelper

  def date_of_event(e)

    if e.respond_to? :updated_at

      e.updated_at

    elsif e.respond_to? :updated_on

      e.updated_on

    elsif e.respond_to? :created_on

      e.created_on

    elsif e.respond_to? :committed_on

      e.committed_on

    else

      nil

    end

  end

  def project_activity_on_events(events)

    # Score each project for which there are any events, by giving

    # each event a score based on how long ago it was (the more recent

    # the better). Return a hash mapping project id to score.

    projhash = Hash.new

    events.each do |e|

      if e.respond_to?(:project)

        p = e.project

        d = date_of_event e

        if !d.nil?

          dd = Date.parse d.to_s

          age = Date.today - dd

          score = (age < 14 ? 15-age : 1)

          if projhash.key? p

            projhash[p] += score

          else

            projhash[p] = score

          end

        end

      end

    end

    projhash

  end

  def projects_by_activity(user, count)

    # Return up to count of the user's project ids ordered by that user's

    # recent activity, omitting any projects for which no activity

    # occurred in the recent past and any projects not visible to

    # the current user

    activity = Redmine::Activity::Fetcher.new(User.current, :author => user)

    # Limit scope so as to exclude issues (which non-members can add)

    activity.scope = [ "changesets", "files", "documents", "news", "wiki_edits", "messages", "time_entries", "publications" ]

    days = Setting.activity_days_default.to_i

    events = activity.events(Date.today - days, Date.today + 1)

    projhash = project_activity_on_events(events)

    projhash.keys.sort_by { |k| -projhash[k] }.first(count)

  end

  def render_active_colleagues(colleagues)

    s = ""

    start = Time.now

    my_inst = ""

    if ! User.current.ssamr_user_detail.nil?

      my_inst = User.current.ssamr_user_detail.institution_name

    end

    actives = Hash.new

    for c in colleagues

      u = User.find_by_id(c)

      active_projects = projects_by_activity(u, 3)

      if !active_projects.empty?

        actives[c] = active_projects

      end

    end

    if actives.empty?

      l(:label_no_active_colleagues)

    else

      s << "<dl>"

      for c in actives.keys.sample(10)

        u = User.find_by_id(c)

        s << "<dt>"

        s << avatar(u, :size => '24')

        s << "<span class='user'>"

        s << h(u.name)

        s << "</span>"

        if !u.ssamr_user_detail.nil?

          inst = u.ssamr_user_detail.institution_name

          if inst != "" and inst != my_inst

            s << " - <span class='institution'>"

            s << h(u.ssamr_user_detail.institution_name)

            s << "</span>"

          end

        end

        s << "</dt>"

        s << "<dd>"

        s << "<span class='active'>"

        s << (actives[c].map { |p| link_to_project(p) }.join ", ")

        s << "</span>"

      end

      s << "</dl>"

      finish = Time.now

      logger.info "render_active_colleagues: took #{finish-start}"

      s

    end

  end

  def busy_projects(events, count)

    # Return a list of count projects randomly selected from amongst

    # the busiest projects represented by the given activity events

    projhash = project_activity_on_events(events)

    # pick N highest values and use cutoff value as selection threshold

    threshold = projhash.values.sort.last(count).first

    # select projects above threshold and pick N from them randomly

    busy = projhash.keys.select { |k| projhash[k] >= threshold }.sample(count)

    # return projects rather than just ids

    busy.map { |pid| Project.find(pid) }

  end

  def busy_institutions(events, count)

    authors = events.map do |e|

      e.event_author unless !e.respond_to?(:event_author)

    end.compact

    institutions = authors.map do |a|

      if a.respond_to?(:ssamr_user_detail) and !a.ssamr_user_detail.nil?

        a.ssamr_user_detail.institution_name

      end

    end

    insthash = institutions.compact.sort.group_by { |i| i }

    insthash = insthash.merge(insthash) { |k,v| v.length }

    threshold = insthash.values.sort.last(count).first

    insthash.keys.select { |k| insthash[k] >= threshold }.sample(count)

  end

  def sort_activity_events(events)

    events_by_group = events.group_by(&:event_group)

    sorted_events = []

    events.sort {|x, y| y.event_datetime <=> x.event_datetime}.each do |event|

      if group_events = events_by_group.delete(event.event_group)

        group_events.sort {|x, y| y.event_datetime <=> x.event_datetime}.each_with_index do |e, i|

          sorted_events << [e, i > 0]

        end

      end

    end

    sorted_events

  end

end