class User < ActiveRecord::Base
  include SearchableModel

  acts_as_token_authenticatable
  devise :invitable, :confirmable, :database_authenticatable, :registerable,
         :async, :recoverable, :rememberable, :trackable, :validatable,
         stretches: Constants::PASSWORD_STRETCH_FACTOR
  has_attached_file :avatar,
                    styles: {
                      medium: Constants::MEDIUM_PIC_FORMAT,
                      thumb: Constants::THUMB_PIC_FORMAT,
                      icon: Constants::ICON_PIC_FORMAT,
                      icon_small: Constants::ICON_SMALL_PIC_FORMAT
                    },
                    default_url: Constants::DEFAULT_AVATAR_URL

  enum tutorial_status: {
    no_tutorial_done: 0,
    intro_tutorial_done: 1
  }

  auto_strip_attributes :full_name, :initials, nullify: false
  validates :full_name,
            presence: true,
            length: { maximum: Constants::NAME_MAX_LENGTH }
  validates :initials,
            presence: true,
            length: { maximum: Constants::USER_INITIALS_MAX_LENGTH }
  validates :email,
            presence: true,
            length: { maximum: Constants::EMAIL_MAX_LENGTH }

  validates_attachment :avatar,
    :content_type => { :content_type => ["image/jpeg", "image/png"] },
    size: { less_than: Constants::AVATAR_MAX_SIZE_MB.megabytes }
  validates :time_zone, presence: true
  validate :time_zone_check

  # Relations
  has_many :user_teams, inverse_of: :user
  has_many :teams, through: :user_teams
  has_many :user_projects, inverse_of: :user
  has_many :projects, through: :user_projects
  has_many :user_my_modules, inverse_of: :user
  has_many :my_modules, through: :user_my_modules
  has_many :comments, inverse_of: :user
  has_many :activities, inverse_of: :user
  has_many :results, inverse_of: :user
  has_many :samples, inverse_of: :user
  has_many :samples_tables, inverse_of: :user, dependent: :destroy
  has_many :repositories, inverse_of: :user
  has_many :repository_table_states, inverse_of: :user, dependent: :destroy
  has_many :steps, inverse_of: :user
  has_many :custom_fields, inverse_of: :user
  has_many :reports, inverse_of: :user
  has_many :created_assets, class_name: 'Asset', foreign_key: 'created_by_id'
  has_many :modified_assets,
           class_name: 'Asset',
           foreign_key: 'last_modified_by_id'
  has_many :created_checklists,
           class_name: 'Checklist',
           foreign_key: 'created_by_id'
  has_many :modified_checklists,
           class_name: 'Checklist',
           foreign_key: 'last_modified_by_id'
  has_many :created_checklist_items,
           class_name: 'ChecklistItem',
           foreign_key: 'created_by_id'
  has_many :modified_checklist_items,
           class_name: 'ChecklistItem',
           foreign_key: 'last_modified_by_id'
  has_many :modified_comments,
           class_name: 'Comment',
           foreign_key: 'last_modified_by_id'
  has_many :modified_custom_fields,
           class_name: 'CustomField',
           foreign_key: 'last_modified_by_id'
  has_many :created_my_module_groups,
           class_name: 'MyModuleGroup',
           foreign_key: 'created_by_id'
  has_many :created_my_module_tags,
           class_name: 'MyModuleTag',
           foreign_key: 'created_by_id'
  has_many :created_my_modules,
           class_name: 'MyModule',
           foreign_key: 'created_by_id'
  has_many :modified_my_modules,
           class_name: 'MyModule',
           foreign_key: 'last_modified_by_id'
  has_many :archived_my_modules,
           class_name: 'MyModule',
           foreign_key: 'archived_by_id'
  has_many :restored_my_modules,
           class_name: 'MyModule',
           foreign_key: 'restored_by_id'
  has_many :created_teams,
           class_name: 'Team',
           foreign_key: 'created_by_id'
  has_many :modified_teams,
           class_name: 'Team',
           foreign_key: 'last_modified_by_id'
  has_many :created_projects,
           class_name: 'Project',
           foreign_key: 'created_by_id'
  has_many :modified_projects,
           class_name: 'Project',
           foreign_key: 'last_modified_by_id'
  has_many :archived_projects,
           class_name: 'Project',
           foreign_key: 'archived_by_id'
  has_many :restored_projects,
           class_name: 'Project',
           foreign_key: 'restored_by_id'
  has_many :modified_reports,
           class_name: 'Report',
           foreign_key: 'last_modified_by_id'
  has_many :modified_results,
           class_name: 'Result',
           foreign_key: 'modified_by_id'
  has_many :archived_results,
           class_name: 'Result',
           foreign_key: 'archived_by_id'
  has_many :restored_results,
           class_name: 'Result',
           foreign_key: 'restored_by_id'
  has_many :created_sample_groups,
           class_name: 'SampleGroup',
           foreign_key: 'created_by_id'
  has_many :modified_sample_groups,
           class_name: 'SampleGroup',
           foreign_key: 'last_modified_by_id'
  has_many :assigned_sample_my_modules,
           class_name: 'SampleMyModule',
           foreign_key: 'assigned_by_id'
  has_many :created_sample_types,
           class_name: 'SampleType',
           foreign_key: 'created_by_id'
  has_many :modified_sample_types,
           class_name: 'SampleType',
           foreign_key: 'last_modified_by_id'
  has_many :modified_samples,
           class_name: 'Sample',
           foreign_key: 'last_modified_by_id'
  has_many :modified_steps, class_name: 'Step', foreign_key: 'modified_by_id'
  has_many :created_tables, class_name: 'Table', foreign_key: 'created_by_id'
  has_many :modified_tables,
           class_name: 'Table',
           foreign_key: 'last_modified_by_id'
  has_many :created_tags, class_name: 'Tag', foreign_key: 'created_by_id'

  has_many :tokens,
           class_name: 'Token',
           foreign_key: 'user_id',
           inverse_of: :user

  has_many :modified_tags,
           class_name: 'Tag',
           foreign_key: 'last_modified_by_id'
  has_many :assigned_user_my_modules,
           class_name: 'UserMyModule',
           foreign_key: 'assigned_by_id'
  has_many :assigned_user_teams,
           class_name: 'UserTeam',
           foreign_key: 'assigned_by_id'
  has_many :assigned_user_projects,
           class_name: 'UserProject',
           foreign_key: 'assigned_by_id'
  has_many :added_protocols,
           class_name: 'Protocol',
           foreign_key: 'added_by_id',
           inverse_of: :added_by
  has_many :archived_protocols,
           class_name: 'Protocol',
           foreign_key: 'archived_by_id',
           inverse_of: :archived_by
  has_many :restored_protocols,
           class_name: 'Protocol',
           foreign_key: 'restored_by_id',
           inverse_of: :restored_by
  has_many :assigned_my_module_repository_rows,
           class_name: 'MyModuleRepositoryRow',
           foreign_key: 'assigned_by_id'

  has_many :user_notifications, inverse_of: :user
  has_many :notifications, through: :user_notifications
  has_many :zip_exports, inverse_of: :user, dependent: :destroy

  # If other errors besides parameter "avatar" exist,
  # they will propagate to "avatar" also, so remove them
  # and put all other (more specific ones) in it
  after_validation :filter_paperclip_errors

  before_destroy :destroy_notifications

  def name
    full_name
  end

  def name=(name)
    full_name = name
  end

  # Search all active users for username & email. Can
  # also specify which team to ignore.
  def self.search(
    active_only,
    query = nil,
    team_to_ignore = nil
  )
    result = User.all

    if active_only
      result = result.where.not(confirmed_at: nil)
    end

    if team_to_ignore.present?
      ignored_ids =
        UserTeam
        .select(:user_id)
        .where(team_id: team_to_ignore.id)
      result =
        result
        .where("users.id NOT IN (?)", ignored_ids)
    end

    result
      .where_attributes_like([:full_name, :email], query)
      .distinct
  end

  def empty_avatar(name, size)
    file_ext = name.split(".").last
    self.avatar_file_name = name
    self.avatar_content_type = Rack::Mime.mime_type(".#{file_ext}")
    self.avatar_file_size = size.to_i
  end

  def filter_paperclip_errors
    if errors.key? :avatar
      errors.delete(:avatar)
      messages = []
      errors.each do |attribute|
        errors.full_messages_for(attribute).each do |message|
          messages << message.split(' ').drop(1).join(' ')
        end
      end
      errors.clear
      errors.set(:avatar, messages)
    end
  end

  # Whether user is active (= confirmed) or not
  def active?
    confirmed_at.present?
  end

  def active_status_str
    if active?
      I18n.t('users.enums.status.active')
    else
      I18n.t('users.enums.status.pending')
    end
  end

  def projects_by_teams(team_id = 0, sort_by = nil, archived = false)
    archived = archived ? true : false
    query = Project.all.joins(:user_projects)
    sql = 'projects.team_id IN (SELECT DISTINCT team_id ' \
          'FROM user_teams WHERE user_teams.user_id = :user_id)'
    if team_id.zero? || !user_teams.find_by(team_id: team_id).try(:admin?)
      # Admins see all projects of team
      sql += ' AND (projects.visibility=1 OR user_projects.user_id=:user_id)'
    end
    sql += ' AND projects.archived = :archived '

    sort =
      case sort_by
      when 'old'
        { created_at: :asc }
      when 'atoz'
        { name: :asc }
      when 'ztoa'
        { name: :desc }
      else
        { created_at: :desc }
      end

    if team_id > 0
      result = query
               .where('projects.team_id = ?', team_id)
               .where(sql, user_id: id, archived: archived)
               .order(sort)
               .distinct
               .group_by(&:team)
    else
      result = query
               .where(sql, user_id: id, archived: archived)
               .order(sort)
               .distinct
               .group_by(&:team)
    end
    result || []
  end

  # Finds all activities of user that is assigned to project. If user
  # is not an owner of the project, user must be also assigned to
  # module.
  def last_activities(last_activity_id = nil,
                      per_page = Constants::ACTIVITY_AND_NOTIF_SEARCH_LIMIT)
    last_activity_id = Constants::INFINITY if last_activity_id < 1
    Activity
      .joins(project: :user_projects)
      .joins("LEFT OUTER JOIN my_modules ON activities.my_module_id = my_modules.id")
      .joins("LEFT OUTER JOIN user_my_modules ON my_modules.id = user_my_modules.my_module_id")
      .where('activities.id < ?', last_activity_id)
      .where(user_projects: { user_id: self })
      .where(
        'activities.my_module_id IS NULL OR ' +
        'user_projects.role = 0 OR ' +
        'user_my_modules.user_id = ?',
        id
      )
      .order(created_at: :desc)
      .limit(per_page)
      .uniq
  end

  def self.find_by_valid_wopi_token(token)
    Rails.logger.warn "WOPI: searching by token #{token}"
    User
      .joins('LEFT OUTER JOIN tokens ON user_id = users.id')
      .where(tokens: { token: token })
      .where('tokens.ttl = 0 OR tokens.ttl > ?', Time.now.to_i)
      .first
  end

  def get_wopi_token
    # WOPI does not have a good way to request a new token,
    # so a new token should be provided each time this is called,
    # while keeping any old tokens as long as they have not yet expired
    tokens = Token.where(user_id: id).distinct

    tokens.each do |token|
      token.delete if token.ttl < Time.now.to_i
    end

    token_string =  "#{Devise.friendly_token(20)}-#{id}"
    # WOPI uses millisecond TTLs
    ttl = (Time.now + 1.day).to_i
    wopi_token = Token.create(token: token_string, ttl: ttl, user_id: id)
    Rails.logger.warn("WOPI: generating new token #{wopi_token.token}")
    wopi_token
  end

  def teams_ids
    teams.pluck(:id)
  end

  # Returns a hash with user statistics
  def statistics
    statistics = {}
    statistics[:number_of_teams] = teams.count
    statistics[:number_of_projects] = projects.count
    number_of_experiments = 0
    projects.find_each do |pr|
      number_of_experiments += pr.experiments.count
    end
    statistics[:number_of_experiments] = number_of_experiments
    statistics[:number_of_protocols] =
      added_protocols.where(
        protocol_type: Protocol.protocol_types.slice(
          :in_repository_private,
          :in_repository_public,
          :in_repository_archived
        ).values
      ).count
    statistics
  end

  protected

  def confirmation_required?
    Rails.configuration.x.enable_email_confirmations
  end

  def time_zone_check
    if time_zone.nil? or ActiveSupport::TimeZone.new(time_zone).nil?
      errors.add(:time_zone)
    end
  end

  private

  def destroy_notifications
    # Find all notifications where user is the only reference
    # on the notification, and destroy all such notifications
    # (user_notifications are destroyed when notification is
    # destroyed). We try to do this efficiently (hence in_groups_of).
    nids_all = notifications.pluck(:id)
    nids_all.in_groups_of(1000, false) do |nids|
      Notification
        .where(id: nids)
        .joins(:user_notifications)
        .group('notifications.id')
        .having('count(notification_id) <= 1')
        .destroy_all
    end

    # Now, simply destroy all user notification relations left
    user_notifications.destroy_all
  end
end