class RepositoryTableState < ApplicationRecord
  belongs_to :user, inverse_of: :repository_table_states, optional: true
  belongs_to :repository, inverse_of: :repository_table_states, optional: true

  validates :user, :repository, presence: true

  def self.load_state(user, repository)
    table_state = where(user: user, repository: repository).pluck(:state)
    if table_state.blank?
      RepositoryTableState.create_state(user, repository)
      table_state = where(user: user, repository: repository).pluck(:state)
    end
    table_state
  end

  def self.update_state(custom_column, column_index, user)
    # table state of every user having access to this repository needs udpating
    table_states = RepositoryTableState.where(
      repository: custom_column.repository
    )
    table_states.each do |table_state|
      repository_state = table_state['state']
      if column_index
        # delete column
        repository_state['columns'].delete(column_index)
        repository_state['columns'].keys.each do |index|
          if index.to_i > column_index.to_i
            repository_state['columns'][(index.to_i - 1).to_s] =
              repository_state['columns'].delete(index)
          else
            index
          end
        end

        repository_state['ColReorder'].delete(column_index)
        repository_state['ColReorder'].map! do |index|
          if index.to_i > column_index.to_i
            (index.to_i - 1).to_s
          else
            index
          end
        end
      else
        # add column
        index = repository_state['columns'].count
        repository_state['columns'][index] = RepositoryDatatable::
          REPOSITORY_TABLE_DEFAULT_STATE['columns'].first
        repository_state['ColReorder'].insert(2, index)
      end
      table_state.update(state: repository_state)
    end
  end

  def self.create_state(user, repository)
    default_columns_num = RepositoryDatatable::
                          REPOSITORY_TABLE_DEFAULT_STATE['columns'].count
    repository_state =
      RepositoryDatatable::REPOSITORY_TABLE_DEFAULT_STATE.deep_dup
    repository.repository_columns.each_with_index do |_, index|
      repository_state['columns'] << RepositoryDatatable::
                               REPOSITORY_TABLE_DEFAULT_STATE['columns'].first
      repository_state['ColReorder'] << (default_columns_num + index)
    end
    RepositoryTableState.create(user: user,
                                repository: repository,
                                state: repository_state)
  end
end