class ProcedureRevision < ApplicationRecord
  include Logic
  self.implicit_order_column = :created_at
  belongs_to :procedure, -> { with_discarded }, inverse_of: :revisions, optional: false
  belongs_to :dossier_submitted_message, inverse_of: :revisions, optional: true, dependent: :destroy

  has_many :dossiers, inverse_of: :revision, foreign_key: :revision_id

  has_many :revision_types_de_champ, -> { order(:position, :id) }, class_name: 'ProcedureRevisionTypeDeChamp', foreign_key: :revision_id, dependent: :destroy, inverse_of: :revision
  has_many :revision_types_de_champ_public, -> { root.public_only.ordered }, class_name: 'ProcedureRevisionTypeDeChamp', foreign_key: :revision_id, dependent: :destroy, inverse_of: :revision
  has_many :revision_types_de_champ_private, -> { root.private_only.ordered }, class_name: 'ProcedureRevisionTypeDeChamp', foreign_key: :revision_id, dependent: :destroy, inverse_of: :revision
  has_many :types_de_champ, through: :revision_types_de_champ, source: :type_de_champ
  has_many :types_de_champ_public, through: :revision_types_de_champ_public, source: :type_de_champ
  has_many :types_de_champ_private, through: :revision_types_de_champ_private, source: :type_de_champ

  has_one :draft_procedure, -> { with_discarded }, class_name: 'Procedure', foreign_key: :draft_revision_id, dependent: :nullify, inverse_of: :draft_revision
  has_one :published_procedure, -> { with_discarded }, class_name: 'Procedure', foreign_key: :published_revision_id, dependent: :nullify, inverse_of: :published_revision

  scope :ordered, -> { order(:created_at) }

  validates :ineligibilite_message, presence: true, if: -> { ineligibilite_enabled? }

  delegate :path, to: :procedure, prefix: true

  validate :ineligibilite_rules_are_valid?,
    on: [:ineligibilite_rules_editor, :publication]
  validates :ineligibilite_message,
    presence: true,
    if: -> { ineligibilite_enabled? },
    on: [:ineligibilite_rules_editor, :publication]

  serialize :ineligibilite_rules, LogicSerializer

  def build_champs_public
    # reload: it can be out of sync in test if some tdcs are added wihtout using add_tdc
    types_de_champ_public.reload.map(&:build_champ)
  end

  def build_champs_private
    # reload: it can be out of sync in test if some tdcs are added wihtout using add_tdc
    types_de_champ_private.reload.map(&:build_champ)
  end

  def add_type_de_champ(params)
    parent_stable_id = params.delete(:parent_stable_id)
    parent_coordinate, _ = coordinate_and_tdc(parent_stable_id)
    parent_id = parent_coordinate&.id

    after_stable_id = params.delete(:after_stable_id)
    after_coordinate, _ = coordinate_and_tdc(after_stable_id)

    siblings = siblings_for(parent_coordinate:, private_tdc: params[:private])

    tdc = TypeDeChamp.new(params)
    if tdc.save
      # moving all the impacted tdc down
      position = next_position_for(after_coordinate:, siblings:)
      siblings.where("position >= ?", position).update_all("position = position + 1")

      # insertion of the new tdc
      h = { type_de_champ: tdc, parent_id: parent_id, position: position }
      revision_types_de_champ.create!(h)
    end

    tdc
  rescue => e
    TypeDeChamp.new.tap { |tdc| tdc.errors.add(:base, e.message) }
  end

  def find_and_ensure_exclusive_use(stable_id)
    coordinate, tdc = coordinate_and_tdc(stable_id)

    if tdc.only_present_on_draft?
      tdc
    else
      replace_type_de_champ_by_clone(coordinate)
    end
  end

  def move_type_de_champ(stable_id, position)
    coordinate, _ = coordinate_and_tdc(stable_id)
    siblings = coordinate.siblings

    if position > coordinate.position
      siblings.where(position: coordinate.position..position).update_all("position = position - 1")
    else
      siblings.where(position: position..coordinate.position).update_all("position = position + 1")
    end
    coordinate.update_column(:position, position)
    coordinate
  end

  def move_type_de_champ_after(stable_id, position)
    coordinate, _ = coordinate_and_tdc(stable_id)
    siblings = coordinate.siblings

    if position > coordinate.position
      siblings.where(position: coordinate.position..position).update_all("position = position - 1")
      coordinate.update_column(:position, position)
    else
      siblings.where(position: (position + 1)...coordinate.position).update_all("position = position + 1")
      coordinate.update_column(:position, position + 1)
    end

    coordinate.reload

    coordinate
  end

  def remove_type_de_champ(stable_id)
    coordinate, tdc = coordinate_and_tdc(stable_id)

    # in case of replay
    return nil if coordinate.nil?

    children = children_of(tdc).to_a
    coordinate.destroy

    children.each(&:destroy_if_orphan)
    tdc.destroy_if_orphan

    coordinate.siblings.where("position >= ?", coordinate.position).update_all("position = position - 1")

    coordinate
  end

  def move_up_type_de_champ(stable_id)
    coordinate, _ = coordinate_and_tdc(stable_id)

    if coordinate.position > 0
      move_type_de_champ(stable_id, coordinate.position - 1)
    else
      coordinate
    end
  end

  def move_down_type_de_champ(stable_id)
    coordinate, _ = coordinate_and_tdc(stable_id)

    move_type_de_champ(stable_id, coordinate.position + 1)
  end

  def draft?
    procedure.draft_revision_id == id
  end

  def locked?
    !draft?
  end

  def compare_types_de_champ(revision)
    changes = []
    changes += compare_revision_types_de_champ(revision_types_de_champ, revision.revision_types_de_champ)
    changes
  end

  def compare_ineligibilite_rules(revision)
    changes = []
    changes += compare_revision_ineligibilite_rules(revision)
    changes
  end

  def dossier_for_preview(user)
    dossier = Dossier
      .create_with(autorisation_donnees: true)
      .find_or_initialize_by(revision: self, user: user, for_procedure_preview: true, state: Dossier.states.fetch(:brouillon))

    if dossier.new_record?
      dossier.build_default_individual
      dossier.save!
    end

    dossier
  end

  def types_de_champ_for(scope: nil, root: false)
    # We return an unordered collection
    return types_de_champ if !root && scope.nil?
    return types_de_champ.filter { scope == :public ? _1.public? : _1.private? } if !root

    # We return an ordered collection
    case scope
    when :public
      types_de_champ_public
    when :private
      types_de_champ_private
    else
      types_de_champ_public + types_de_champ_private
    end
  end

  def children_of(tdc)
    if revision_types_de_champ.loaded?
      parent_coordinate_id = revision_types_de_champ
        .filter { _1.type_de_champ_id == tdc.id }
        .map(&:id)

      revision_types_de_champ
        .filter { _1.parent_id.in?(parent_coordinate_id) }
        .sort_by(&:position)
        .map(&:type_de_champ)
    else
      parent_coordinate_id = revision_types_de_champ.where(type_de_champ: tdc).select(:id)

      types_de_champ
        .where(procedure_revision_types_de_champ: { parent_id: parent_coordinate_id })
        .order("procedure_revision_types_de_champ.position")
    end
  end

  def parent_of(tdc)
    revision_types_de_champ
      .find { _1.type_de_champ_id == tdc.id }.parent&.type_de_champ
  end

  def child?(tdc)
    revision_types_de_champ
      .find { _1.type_de_champ_id == tdc.id }.child?
  end

  def remove_children_of(tdc)
    children_of(tdc).each do |child|
      remove_type_de_champ(child.stable_id)
    end
  end

  def dependent_conditions(tdc)
    stable_id = tdc.stable_id

    (tdc.public? ? types_de_champ_public : types_de_champ_private).filter do |other_tdc|
      next if !other_tdc.condition?

      other_tdc.condition.sources.include?(stable_id)
    end
  end

  # Estimated duration to fill the form, in seconds.
  #
  # If the revision is locked (i.e. published), the result is cached (because type de champs can no longer be mutated).
  def estimated_fill_duration
    Rails.cache.fetch("#{cache_key_with_version}/estimated_fill_duration", expires_in: 12.hours, force: !locked?) do
      compute_estimated_fill_duration
    end
  end

  def coordinate_for(tdc)
    revision_types_de_champ.find_by!(type_de_champ: tdc)
  end

  def carte?
    types_de_champ_public.any?(&:carte?)
  end

  def coordinate_and_tdc(stable_id)
    return [nil, nil] if stable_id.blank?

    coordinate = revision_types_de_champ
      .joins(:type_de_champ)
      .find_by(type_de_champ: { stable_id: stable_id })

    [coordinate, coordinate&.type_de_champ]
  end

  def routable_types_de_champ
    types_de_champ_public.filter(&:routable?)
  end

  def conditionable_types_de_champ
    types_de_champ_for(scope: :public).filter(&:conditionable?)
  end

  def ineligibilite_rules_computable?(champs)
    ineligibilite_enabled && ineligibilite_rules&.computable?(champs)
  ensure
    champs.map(&:reset_visible) # otherwise @visible is cached, then dossier can be updated. champs are not updated
  end

  private

  def compute_estimated_fill_duration
    types_de_champ_public.sum do |tdc|
      next tdc.estimated_read_duration unless tdc.fillable?

      duration = tdc.estimated_read_duration + tdc.estimated_fill_duration(self)
      duration /= 2 unless tdc.mandatory?

      duration
    end
  end

  def children_types_de_champ_as_json(tdcs_as_json, parent_tdcs)
    parent_tdcs.each do |parent_tdc|
      tdc_as_json = tdcs_as_json.find { |json| json["id"] == parent_tdc.stable_id }
      tdc_as_json&.merge!(types_de_champ: children_of(parent_tdc).includes(piece_justificative_template_attachment: :blob).map(&:as_json_for_editor))
    end
  end

  def siblings_for(parent_coordinate: nil, private_tdc: false)
    if parent_coordinate
      parent_coordinate.revision_types_de_champ
    elsif private_tdc
      revision_types_de_champ_private
    else
      revision_types_de_champ_public
    end
  end

  def next_position_for(siblings:, after_coordinate: nil)
    # either we are at the beginning of the list or after another item
    if after_coordinate.nil? # first element of the list, starts at 0
      0
    else # after another item
      after_coordinate.position + 1
    end
  end

  def compare_revision_types_de_champ(from_coordinates, to_coordinates)
    if from_coordinates == to_coordinates
      []
    else
      from_h = from_coordinates.index_by(&:stable_id)
      to_h = to_coordinates.index_by(&:stable_id)

      from_sids = from_h.keys
      to_sids = to_h.keys

      removed = (from_sids - to_sids).map { ProcedureRevisionChange::RemoveChamp.new(from_h[_1]) }
      added = (to_sids - from_sids).map { ProcedureRevisionChange::AddChamp.new(to_h[_1]) }

      kept = from_sids.intersection(to_sids)

      moved = kept
        .map { [from_h[_1], to_h[_1]] }
        .filter { |from, to| from.position != to.position }
        .map { |from, to| ProcedureRevisionChange::MoveChamp.new(from, from.position, to.position) }

      changed = kept
        .map { [from_h[_1], to_h[_1]] }
        .flat_map { |from, to| compare_type_de_champ(from.type_de_champ, to.type_de_champ, from_coordinates, to_coordinates) }

      (removed + added + moved + changed).sort_by { _1.op == :remove ? from_sids.index(_1.stable_id) : to_sids.index(_1.stable_id) }
    end
  end

  def compare_revision_ineligibilite_rules(new_revision)
    from_ineligibilite_rules = ineligibilite_rules
    to_ineligibilite_rules = new_revision.ineligibilite_rules
    changes = []

    if from_ineligibilite_rules.present? && to_ineligibilite_rules.blank?
      changes << ProcedureRevisionChange::RemoveEligibiliteRuleChange
    end
    if from_ineligibilite_rules.blank? && to_ineligibilite_rules.present?
      changes << ProcedureRevisionChange::AddEligibiliteRuleChange
    end
    if from_ineligibilite_rules != to_ineligibilite_rules
      changes << ProcedureRevisionChange::UpdateEligibiliteRuleChange
    end
    if ineligibilite_message != new_revision.ineligibilite_message
      changes << ProcedureRevisionChange::UpdateEligibiliteMessageChange
    end
    if ineligibilite_enabled != new_revision.ineligibilite_enabled
      changes << (new_revision.ineligibilite_enabled ? ProcedureRevisionChange::EligibiliteEnabledChange : ProcedureRevisionChange::EligibiliteDisabledChange)
    end
    changes.map { _1.new(self, new_revision) }
  end

  def compare_type_de_champ(from_type_de_champ, to_type_de_champ, from_coordinates, to_coordinates)
    changes = []
    if from_type_de_champ.type_champ != to_type_de_champ.type_champ
      changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
        :type_champ,
        from_type_de_champ.type_champ,
        to_type_de_champ.type_champ)
    end
    if from_type_de_champ.libelle != to_type_de_champ.libelle
      changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
        :libelle,
        from_type_de_champ.libelle,
        to_type_de_champ.libelle)
    end
    if from_type_de_champ.collapsible_explanation_enabled? != to_type_de_champ.collapsible_explanation_enabled?
      changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
        :collapsible_explanation_enabled,
        from_type_de_champ.collapsible_explanation_enabled?,
        to_type_de_champ.collapsible_explanation_enabled?)
    end
    if from_type_de_champ.collapsible_explanation_text != to_type_de_champ.collapsible_explanation_text
      changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
        :collapsible_explanation_text,
        from_type_de_champ.collapsible_explanation_text,
        to_type_de_champ.collapsible_explanation_text)
    end
    if from_type_de_champ.description != to_type_de_champ.description
      changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
        :description,
        from_type_de_champ.description,
        to_type_de_champ.description)
    end
    if from_type_de_champ.mandatory? != to_type_de_champ.mandatory?
      changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
        :mandatory,
        from_type_de_champ.mandatory?,
        to_type_de_champ.mandatory?)
    end

    if from_type_de_champ.condition != to_type_de_champ.condition
      changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
        :condition,
        from_type_de_champ.condition&.to_s(from_coordinates.map(&:type_de_champ)),
        to_type_de_champ.condition&.to_s(to_coordinates.map(&:type_de_champ)))
    end

    if to_type_de_champ.drop_down_list?
      if from_type_de_champ.drop_down_list_options != to_type_de_champ.drop_down_list_options
        changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
          :drop_down_options,
          from_type_de_champ.drop_down_list_options,
          to_type_de_champ.drop_down_list_options)
      end
      if to_type_de_champ.linked_drop_down_list?
        if from_type_de_champ.drop_down_secondary_libelle != to_type_de_champ.drop_down_secondary_libelle
          changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
            :drop_down_secondary_libelle,
            from_type_de_champ.drop_down_secondary_libelle,
            to_type_de_champ.drop_down_secondary_libelle)
        end
        if from_type_de_champ.drop_down_secondary_description != to_type_de_champ.drop_down_secondary_description
          changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
            :drop_down_secondary_description,
            from_type_de_champ.drop_down_secondary_description,
            to_type_de_champ.drop_down_secondary_description)
        end
      end
      if from_type_de_champ.drop_down_other? != to_type_de_champ.drop_down_other?
        changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
          :drop_down_other,
          from_type_de_champ.drop_down_other?,
          to_type_de_champ.drop_down_other?)
      end
    elsif to_type_de_champ.carte?
      if from_type_de_champ.carte_optional_layers != to_type_de_champ.carte_optional_layers
        changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
          :carte_layers,
          from_type_de_champ.carte_optional_layers,
          to_type_de_champ.carte_optional_layers)
      end
    elsif to_type_de_champ.piece_justificative?
      if from_type_de_champ.checksum_for_attachment(:piece_justificative_template) != to_type_de_champ.checksum_for_attachment(:piece_justificative_template)
        changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
          :piece_justificative_template,
          from_type_de_champ.filename_for_attachement(:piece_justificative_template),
          to_type_de_champ.filename_for_attachement(:piece_justificative_template))
      end
    elsif to_type_de_champ.explication?
      if from_type_de_champ.checksum_for_attachment(:notice_explicative) != to_type_de_champ.checksum_for_attachment(:notice_explicative)
        changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
          :notice_explicative,
          from_type_de_champ.filename_for_attachement(:notice_explicative),
          to_type_de_champ.filename_for_attachement(:notice_explicative))
      end
    elsif to_type_de_champ.textarea?
      if from_type_de_champ.character_limit != to_type_de_champ.character_limit
        changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
          :character_limit,
          from_type_de_champ.character_limit,
          to_type_de_champ.character_limit)
      end
    elsif to_type_de_champ.expression_reguliere?
      if from_type_de_champ.expression_reguliere != to_type_de_champ.expression_reguliere
        changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
          :expression_reguliere,
          from_type_de_champ.expression_reguliere,
          to_type_de_champ.expression_reguliere)
      end
      if from_type_de_champ.expression_reguliere_exemple_text != to_type_de_champ.expression_reguliere_exemple_text
        changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
          :expression_reguliere_exemple_text,
          from_type_de_champ.expression_reguliere_exemple_text,
          to_type_de_champ.expression_reguliere_exemple_text)
      end
      if from_type_de_champ.expression_reguliere_error_message != to_type_de_champ.expression_reguliere_error_message
        changes << ProcedureRevisionChange::UpdateChamp.new(from_type_de_champ,
          :expression_reguliere_error_message,
          from_type_de_champ.expression_reguliere_error_message,
          to_type_de_champ.expression_reguliere_error_message)
      end
    end
    changes
  end

  def ineligibilite_rules_are_valid?
    if ineligibilite_rules
      ineligibilite_rules.errors(types_de_champ_for(scope: :public).to_a)
        .each { errors.add(:ineligibilite_rules, :invalid) }
    end
  end

  def ineligibilite_rules_are_valid?
    if ineligibilite_rules
      ineligibilite_rules.errors(types_de_champ_for(scope: :public).to_a)
        .each { errors.add(:ineligibilite_rules, :invalid) }
    end
  end

  def replace_type_de_champ_by_clone(coordinate)
    cloned_type_de_champ = coordinate.type_de_champ.deep_clone do |original, kopy|
      ClonePiecesJustificativesService.clone_attachments(original, kopy)
    end
    coordinate.update!(type_de_champ: cloned_type_de_champ)
    cloned_type_de_champ
  end
end