class Entry < ApplicationRecord
  belongs_to :created_by, class_name: "User", optional: true
  belongs_to :updated_by, class_name: "User", optional: true
  belongs_to :requested_by, class_name: "User", optional: true

  has_many :suggested_meanings, dependent: :destroy
  has_many :comments, as: :commentable, dependent: :destroy

  enum :category, %i[word phrase proper_name title reference other]
  enum :status, %i[requested approved active], default: :active

  validates :category, presence: true
  validate :at_least_one_translation

  scope :with_category, ->(cat) { cat.present? ? where(category: cat) : all }
  scope :requested, -> { where(status: :requested) }
  scope :approved, -> { where(status: :approved) }
  scope :active_entries, -> { where(status: :active) }

  def self.search(query, language_code: nil)
    return all if query.blank?

    terms = query.to_s.strip.split(/\s+/).map { |term| term.gsub('"', '""') }.reject(&:blank?)
    return all if terms.empty?

    prefix = valid_lang?(language_code) ? "#{language_code}:" : ""
    fts_query = terms.map { |term| "#{prefix}\"#{term}\"*" }.join(" ")

    joins("JOIN entries_fts ON entries_fts.rowid = entries.id")
      .where("entries_fts MATCH ?", fts_query)
  end

  def self.starts_with(prefix, language_code:)
    return none unless valid_lang?(language_code)
    return all if prefix.blank?

    where(arel_table[language_code].matches("#{sanitize_sql_like(prefix)}%"))
  end

  def self.alphabetical_for(language_code)
    return none unless valid_lang?(language_code)

    where.not(language_code => [ nil, "" ])
      .order(arel_table[language_code].asc)
  end

  private

  def self.valid_lang?(code)
    SupportedLanguage.valid_codes.include?(code.to_s)
  end

  def at_least_one_translation
    if [ fi, en, sv, no, ru, de ].all?(&:blank?)
      errors.add(:base, "At least one language translation is required")
    end
  end
end
