class Dossier < ActiveRecord::Base
  enum state: {
    draft:                'draft',
    initiated:            'initiated',
    received:             'received',
    closed:               'closed',
    refused:              'refused',
    without_continuation: 'without_continuation'
  }

  BROUILLON = %w(draft)
  NOUVEAUX = %w(initiated)
  EN_CONSTRUCTION = %w(initiated)
  EN_INSTRUCTION = %w(received)
  EN_CONSTRUCTION_OU_INSTRUCTION = EN_CONSTRUCTION + EN_INSTRUCTION
  TERMINE = %w(closed refused without_continuation)

  has_one :etablissement, dependent: :destroy
  has_one :entreprise, dependent: :destroy
  has_one :individual, dependent: :destroy
  has_one :attestation
  has_many :cerfa, dependent: :destroy

  has_many :pieces_justificatives, dependent: :destroy
  has_many :champs, class_name: 'ChampPublic', dependent: :destroy
  has_many :champs_private, class_name: 'ChampPrivate', dependent: :destroy
  has_many :quartier_prioritaires, dependent: :destroy
  has_many :cadastres, dependent: :destroy
  has_many :commentaires, dependent: :destroy
  has_many :invites, dependent: :destroy
  has_many :invites_user, class_name: 'InviteUser', dependent: :destroy
  has_many :invites_gestionnaires, class_name: 'InviteGestionnaire', dependent: :destroy
  has_many :follows
  has_many :notifications, dependent: :destroy
  has_many :avis, dependent: :destroy

  belongs_to :procedure
  belongs_to :user

  accepts_nested_attributes_for :champs
  accepts_nested_attributes_for :champs_private

  default_scope { where(hidden_at: nil) }
  scope :state_brouillon,                      -> { where(state: BROUILLON) }
  scope :state_not_brouillon,                  -> { where.not(state: BROUILLON) }
  scope :state_nouveaux,                       -> { where(state: NOUVEAUX) }
  scope :state_en_construction,                -> { where(state: EN_CONSTRUCTION) }
  scope :state_en_instruction,                 -> { where(state: EN_INSTRUCTION) }
  scope :state_en_construction_ou_instruction, -> { where(state: EN_CONSTRUCTION_OU_INSTRUCTION) }
  scope :state_termine,                        -> { where(state: TERMINE) }

  scope :archived,      -> { where(archived: true) }
  scope :not_archived,  -> { where(archived: false) }

  scope :order_by_updated_at, -> (order = :desc) { order(updated_at: order) }

  scope :all_state,                   -> { not_archived.state_not_brouillon.order_by_updated_at(:asc) }
  scope :nouveaux,                    -> { not_archived.state_nouveaux.order_by_updated_at(:asc) }
  scope :en_instruction,              -> { not_archived.state_en_instruction.order_by_updated_at(:asc) }
  scope :termine,                     -> { not_archived.state_termine.order_by_updated_at(:asc) }
  scope :downloadable,                -> { state_not_brouillon.order_by_updated_at(:asc) }
  scope :en_cours,                    -> { not_archived.state_en_construction_ou_instruction.order_by_updated_at(:asc) }
  scope :without_followers,           -> { includes(:follows).where(follows: { id: nil }) }
  scope :with_unread_notifications,   -> { where(notifications: { already_read: false }) }

  accepts_nested_attributes_for :individual

  delegate :siren, to: :entreprise
  delegate :siret, to: :etablissement, allow_nil: true
  delegate :types_de_piece_justificative, to: :procedure
  delegate :types_de_champ, to: :procedure
  delegate :france_connect_information, to: :user

  before_validation :update_state_dates, if: -> { state_changed? }

  after_save :build_default_champs, if: Proc.new { procedure_id_changed? }
  after_save :build_default_individual, if: Proc.new { procedure.for_individual? }
  after_save :send_notification_email

  validates :user, presence: true

  def unreaded_notifications
    @unreaded_notif ||= notifications.where(already_read: false)
  end

  def first_unread_notification
    unreaded_notifications.order("created_at ASC").first
  end

  def was_piece_justificative_uploaded_for_type_id?(type_id)
    pieces_justificatives.where(type_de_piece_justificative_id: type_id).count > 0
  end

  def notifications_summary
    unread_notifications = notifications.unread

    {
      demande: unread_notifications.select(&:demande?).present?,
      avis: unread_notifications.select(&:avis?).present?,
      messagerie: unread_notifications.select(&:messagerie?).present?
    }
  end

  def retrieve_last_piece_justificative_by_type(type)
    pieces_justificatives.where(type_de_piece_justificative_id: type).last
  end

  def retrieve_all_piece_justificative_by_type(type)
    pieces_justificatives.where(type_de_piece_justificative_id: type).order(created_at: :DESC)
  end

  def build_default_champs
    procedure.types_de_champ.all.each do |type_de_champ|
      ChampPublic.create(type_de_champ: type_de_champ, dossier: self)
    end

    procedure.types_de_champ_private.all.each do |type_de_champ|
      ChampPrivate.create(type_de_champ: type_de_champ, dossier: self)
    end
  end

  def build_default_individual
    if Individual.where(dossier_id: self.id).count == 0
      Individual.create(dossier: self)
    end
  end

  def ordered_champs
    # TODO: use the line below when the procedure preview does not leak champ with dossier_id == 0
    # champs.joins(:type_de_champ).order('types_de_champ.order_place')
    champs.joins(', types_de_champ').where("champs.type_de_champ_id = types_de_champ.id AND types_de_champ.procedure_id = #{procedure.id}").order('order_place')
  end

  def ordered_champs_private
    # TODO: use the line below when the procedure preview does not leak champ with dossier_id == 0
    # champs_private.includes(:type_de_champ).order('types_de_champ.order_place')
    champs_private.joins(', types_de_champ').where("champs.type_de_champ_id = types_de_champ.id AND types_de_champ.procedure_id = #{procedure.id}").order('order_place')
  end

  def ordered_pieces_justificatives
    champs.joins(', types_de_piece_justificative').where("pieces_justificatives.type_de_piece_justificative_id = types_de_piece_justificative.id AND types_de_piece_justificative.procedure_id = #{procedure.id}").order('order_place ASC')
  end

  def next_step! role, action, motivation = nil
    unless %w(initiate follow update comment receive refuse without_continuation close).include?(action)
      fail 'action is not valid'
    end

    unless %w(user gestionnaire).include?(role)
      fail 'role is not valid'
    end

    case role
    when 'user'
      case action
      when 'initiate'
        if draft?
          initiated!
        end
      end
    when 'gestionnaire'
      case action
      when 'close'
        if received?
          self.attestation = build_attestation
          save

          closed!

          if motivation
            self.motivation = motivation
            save
          end
        end
      when 'refuse'
        if received?
          refused!

          if motivation
            self.motivation = motivation
            save
          end
        end
      when 'without_continuation'
        if received?
          without_continuation!

          if motivation
            self.motivation = motivation
            save
          end
        end
      end
    end

    state
  end

  def brouillon?
    BROUILLON.include?(state)
  end

  def en_construction?
    EN_CONSTRUCTION.include?(state)
  end

  def en_instruction?
    EN_INSTRUCTION.include?(state)
  end

  def en_construction_ou_instruction?
    EN_CONSTRUCTION_OU_INSTRUCTION.include?(state)
  end

  def termine?
    TERMINE.include?(state)
  end

  def cerfa_available?
    procedure.cerfa_flag? && cerfa.size != 0
  end

  def convert_specific_hash_values_to_string(hash_to_convert)
    hash = {}
    hash_to_convert.each do |key, value|
      value = serialize_value_for_export(value)
      hash.store(key, value)
    end
    return hash
  end

  def full_data_strings_array
    data_with_champs.map do |value|
      serialize_value_for_export(value)
    end
  end

  def export_entreprise_data
    unless entreprise.nil?
      etablissement_attr = EtablissementCsvSerializer.new(self.etablissement).attributes.map { |k, v| ["etablissement.#{k}".parameterize.underscore.to_sym, v] }.to_h
      entreprise_attr = EntrepriseSerializer.new(self.entreprise).attributes.map { |k, v| ["entreprise.#{k}".parameterize.underscore.to_sym, v] }.to_h
    else
      etablissement_attr = EtablissementSerializer.new(Etablissement.new).attributes.map { |k, v| ["etablissement.#{k}".parameterize.underscore.to_sym, v] }.to_h
      entreprise_attr = EntrepriseSerializer.new(Entreprise.new).attributes.map { |k, v| ["entreprise.#{k}".parameterize.underscore.to_sym, v] }.to_h
    end
    return convert_specific_hash_values_to_string(etablissement_attr.merge(entreprise_attr))
  end

  def data_with_champs
    serialized_dossier = DossierTableExportSerializer.new(self)
    data = serialized_dossier.attributes.values
    data += self.ordered_champs.map(&:value)
    data += self.ordered_champs_private.map(&:value)
    data += self.export_entreprise_data.values
    return data
  end

  def export_headers
    serialized_dossier = DossierTableExportSerializer.new(self)
    headers = serialized_dossier.attributes.keys
    headers += self.procedure.types_de_champ.order(:order_place).map { |types_de_champ| types_de_champ.libelle.parameterize.underscore.to_sym }
    headers += self.procedure.types_de_champ_private.order(:order_place).map { |types_de_champ| types_de_champ.libelle.parameterize.underscore.to_sym }
    headers += self.export_entreprise_data.keys
    return headers
  end

  def followers_gestionnaires
    follows.includes(:gestionnaire).map(&:gestionnaire)
  end

  def reset!
    etablissement.destroy
    entreprise.destroy

    update_attributes(autorisation_donnees: false)
  end

  def total_follow
    follows.size
  end

  def read_only?
    received? || closed? || refused? || without_continuation?
  end

  def owner? email
    user.email == email
  end

  def invite_by_user? email
    (invites_user.pluck :email).include? email
  end

  def can_be_initiated?
    !(procedure.archivee? && draft?)
  end

  def text_summary
    if brouillon?
      parts = [
        "Dossier en brouillon répondant à la procédure ",
        procedure.libelle,
        " gérée par l'organisme ",
        procedure.organisation
      ]
    else
      parts = [
        "Dossier déposé le ",
        initiated_at.localtime.strftime("%d/%m/%Y"),
        " sur la procédure ",
        procedure.libelle,
        " gérée par l'organisme ",
        procedure.organisation
      ]
    end

    parts.join
  end

  def avis_for(gestionnaire)
    if gestionnaire.dossiers.include?(self)
      avis.order(created_at: :asc)
    else
      avis
        .where(confidentiel: false)
        .or(avis.where(claimant: gestionnaire))
        .or(avis.where(gestionnaire: gestionnaire))
        .order(created_at: :asc)
    end
  end

  private

  def build_attestation
    if procedure.attestation_template.present? && procedure.attestation_template.activated?
      procedure.attestation_template.attestation_for(self)
    end
  end

  def update_state_dates
    if initiated? && !self.initiated_at
      self.initiated_at = DateTime.now
    elsif received? && !self.received_at
      self.received_at = DateTime.now
    elsif TERMINE.include?(state)
      self.processed_at = DateTime.now
    end
  end

  def serialize_value_for_export(value)
    value.nil? || value.kind_of?(Time) ? value : value.to_s
  end

  def send_notification_email
    if state_changed? && EN_INSTRUCTION.include?(state)
      NotificationMailer.send_notification(self, procedure.received_mail_template).deliver_now!
    end
  end
end