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# Redmine - project management software

# Copyright (C) 2006-2014  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 Redmine

  module Helpers

    class TimeReport

      attr_reader :criteria, :columns, :hours, :total_hours, :periods

      def initialize(project, issue, criteria, columns, time_entry_scope)

        @project = project

        @issue = issue

        @criteria = criteria || []

        @criteria = @criteria.select{|criteria| available_criteria.has_key? criteria}

        @criteria.uniq!

        @criteria = @criteria[0,3]

        @columns = (columns && %w(year month week day).include?(columns)) ? columns : 'month'

        @scope = time_entry_scope

        run

      end

      def available_criteria

        @available_criteria || load_available_criteria

      end

      private

      def run

        unless @criteria.empty?

          time_columns = %w(tyear tmonth tweek spent_on)

          @hours = []

          @scope.includes(:issue, :activity).

              group(@criteria.collect{|criteria| @available_criteria[criteria][:sql]} + time_columns).

              joins(@criteria.collect{|criteria| @available_criteria[criteria][:joins]}.compact).

              sum(:hours).each do |hash, hours|

            h = {'hours' => hours}

            (@criteria + time_columns).each_with_index do |name, i|

              h[name] = hash[i]

            end

            @hours << h

          end

          @hours.each do |row|

            case @columns

            when 'year'

              row['year'] = row['tyear']

            when 'month'

              row['month'] = "#{row['tyear']}-#{row['tmonth']}"

            when 'week'

              row['week'] = "#{row['spent_on'].cwyear}-#{row['tweek']}"

            when 'day'

              row['day'] = "#{row['spent_on']}"

            end

          end

          min = @hours.collect {|row| row['spent_on']}.min

          @from = min ? min.to_date : Date.today

          max = @hours.collect {|row| row['spent_on']}.max

          @to = max ? max.to_date : Date.today

          @total_hours = @hours.inject(0) {|s,k| s = s + k['hours'].to_f}

          @periods = []

          # Date#at_beginning_of_ not supported in Rails 1.2.x

          date_from = @from.to_time

          # 100 columns max

          while date_from <= @to.to_time && @periods.length < 100

            case @columns

            when 'year'

              @periods << "#{date_from.year}"

              date_from = (date_from + 1.year).at_beginning_of_year

            when 'month'

              @periods << "#{date_from.year}-#{date_from.month}"

              date_from = (date_from + 1.month).at_beginning_of_month

            when 'week'

              @periods << "#{date_from.to_date.cwyear}-#{date_from.to_date.cweek}"

              date_from = (date_from + 7.day).at_beginning_of_week

            when 'day'

              @periods << "#{date_from.to_date}"

              date_from = date_from + 1.day

            end

          end

        end

      end

      def load_available_criteria

        @available_criteria = { 'project' => {:sql => "#{TimeEntry.table_name}.project_id",

                                              :klass => Project,

                                              :label => :label_project},

                                 'status' => {:sql => "#{Issue.table_name}.status_id",

                                              :klass => IssueStatus,

                                              :label => :field_status},

                                 'version' => {:sql => "#{Issue.table_name}.fixed_version_id",

                                              :klass => Version,

                                              :label => :label_version},

                                 'category' => {:sql => "#{Issue.table_name}.category_id",

                                                :klass => IssueCategory,

                                                :label => :field_category},

                                 'user' => {:sql => "#{TimeEntry.table_name}.user_id",

                                             :klass => User,

                                             :label => :label_user},

                                 'tracker' => {:sql => "#{Issue.table_name}.tracker_id",

                                              :klass => Tracker,

                                              :label => :label_tracker},

                                 'activity' => {:sql => "#{TimeEntry.table_name}.activity_id",

                                               :klass => TimeEntryActivity,

                                               :label => :label_activity},

                                 'issue' => {:sql => "#{TimeEntry.table_name}.issue_id",

                                             :klass => Issue,

                                             :label => :label_issue}

                               }

        # Add time entry custom fields

        custom_fields = TimeEntryCustomField.all

        # Add project custom fields

        custom_fields += ProjectCustomField.all

        # Add issue custom fields

        custom_fields += (@project.nil? ? IssueCustomField.for_all : @project.all_issue_custom_fields)

        # Add time entry activity custom fields

        custom_fields += TimeEntryActivityCustomField.all

        # Add list and boolean custom fields as available criteria

        custom_fields.select {|cf| %w(list bool).include?(cf.field_format) && !cf.multiple?}.each do |cf|

          @available_criteria["cf_#{cf.id}"] = {:sql => cf.group_statement,

                                                 :joins => cf.join_for_order_statement,

                                                 :format => cf.field_format,

                                                 :custom_field => cf,

                                                 :label => cf.name}

        end

        @available_criteria

      end

    end

  end

end