# 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.

class Member < ActiveRecord::Base
  belongs_to :user
  belongs_to :principal, :foreign_key => 'user_id'
  has_many :member_roles, :dependent => :destroy
  has_many :roles, :through => :member_roles
  
  belongs_to :project
  belongs_to :course

  belongs_to :course_group
  validates_presence_of :principal
  validates_uniqueness_of :user_id, :scope => [:project_id,:course_id]
  validate :validate_role

  before_destroy :set_issue_category_nil
  # 删除项目成员一并删除该成员的邀请记录
  after_destroy :delete_ivite_list



  def role
  end

  def role=
  end

  def name
    self.user.name
  end

  alias :base_role_ids= :role_ids=
  def role_ids=(arg)
    ids = (arg || []).collect(&:to_i) - [0]
    # Keep inherited roles
    ids += member_roles.select {|mr| !mr.inherited_from.nil?}.collect(&:role_id)

    new_role_ids = ids - role_ids
    # Add new roles
    new_role_ids.each {|id| member_roles << MemberRole.new(:role_id => id) }
    # Remove roles (Rails' #role_ids= will not trigger MemberRole#on_destroy)
    member_roles_to_destroy = member_roles.select {|mr| !ids.include?(mr.role_id)}
    if member_roles_to_destroy.any?
      member_roles_to_destroy.each(&:destroy)
    end
  end

  def <=>(member)
    a, b = roles.sort.first, member.roles.sort.first
    if a == b
      if principal
        principal <=> member.principal
      else
        1
      end
    elsif a
      a <=> b
    else
      1
    end
  end

  def deletable?
    member_roles.detect {|mr| mr.inherited_from}.nil?
  end

  def include?(user)
    if principal.is_a?(Group)
      !user.nil? && user.groups.include?(principal)
    else
      self.user == user
    end
  end

  def set_issue_category_nil
    if user
      # remove category based auto assignments for this member
      #modify by nwb
      if project
        IssueCategory.update_all "assigned_to_id = NULL", ["project_id = ? AND assigned_to_id = ?", project.id, user.id]
      elsif course
        #IssueCategory.update_all "assigned_to_id = NULL", ["course_id = ? AND assigned_to_id = ?", course.id, user.id]
      end

    end
  end

  # 删除成员一并删除该成员的邀请信息
  def delete_ivite_list
    member_invite_lists = InviteList.where("user_id =? and project_id =?", self.user_id, self.project_id)
    unless member_invite_lists.nil?
      member_invite_lists.each do |member_invite_list|
        member_invite_list.destroy
      end
    end
  end

  # Find or initilize a Member with an id, attributes, and for a Principal
  def self.edit_membership(id, new_attributes, principal=nil)
    @membership = id.present? ? Member.find(id) : Member.new(:principal => principal)
    @membership.attributes = new_attributes
    @membership
  end

  # Finds or initilizes a Member for the given project and principal
  def self.find_or_new(project, principal)
    project_id = project.is_a?(Project) ? project.id : project
    principal_id = principal.is_a?(Principal) ? principal.id : principal

    member = Member.find_by_project_id_and_user_id(project_id, principal_id)
    member ||= Member.new(:project_id => project_id, :user_id => principal_id)
    member
  end

  # 查找每个学生每个作业的评分
  def student_homework_score
    homework_score = StudentWork.find_by_sql("SELECT homework_commons.name,student_works.final_score as score
      FROM student_works,homework_commons
      WHERE student_works.homework_common_id = homework_commons.id
      AND homework_commons.course_id = #{self.course_id}
      AND student_works.user_id = #{self.user_id}")
    score_count = StudentWork.joins(:homework_common).where("student_works.user_id = #{self.user_id} and homework_commons.course_id = #{self.course_id}").average(:final_score).try(:round, 2).to_f
    [homework_score, format("%0.2f", score_count)]
  end

  def student_work_score
    StudentWork.select("homework_commons.name, student_works.final_score").joins(:homework_common).where("student_works.user_id = #{self.user_id} and homework_commons.course_id = #{self.course_id}")
  end

  #当前课程的作业列表
  def homework_common_list
    HomeworkCommon.where("course_id = ? and publish_time is not null and publish_time <= '#{Date.today}'", self.course_id)
  end

  #当前学生在指定作业内的得分
  def homework_common_score homework_common
    StudentWork.select("IF(final_score is null,null,IF(final_score = 0, 0, final_score - absence_penalty - late_penalty)) as final_score").where(:homework_common_id => homework_common.id,:user_id => self.user_id)
  end

  def student_work_score_avg
    StudentWork.joins(:homework_common).where("student_works.user_id = #{self.user_id} and homework_commons.course_id = #{self.course_id}").average(:final_score).try(:round, 2).to_f
  end

  def student_work_score_sum
    sql_select = "SELECT (SUM(IF(student_works.final_score IS NULL,NULL,IF(student_works.final_score =0,0,IF((student_works.final_score - student_works.absence_penalty - student_works.late_penalty) < 0 , 0, student_works.final_score - student_works.absence_penalty - student_works.late_penalty))))) AS score
          FROM student_works,homework_commons
          WHERE student_works.homework_common_id = homework_commons.id
          AND homework_commons.course_id = #{self.course_id}
          AND student_works.user_id = #{self.user_id}"
    score = StudentWork.find_by_sql(sql_select)
  end

  protected

  def validate_role
    errors.add_on_empty :role if member_roles.empty? && roles.empty?
  end



  def searchTeacherAndAssistant project
    #searchPeopleByRoles(project, TeacherRoles)
    members = []
    project.members.each do |m|
      members << m  if m && m.user && m.user.allowed_to?(:as_teacher,project)
    end
    members
  end
end