require 'json'
require 'securerandom'
require 'fileutils'

# Simple file-backed store for reusable ZPL/ESC-POS label templates -- one
# JSON file per label under DIR, similar in spirit to brother_ql_web's own
# label repository. No per-printer targeting yet (type just says which print
# path to use); that can be added once labels can target any of the five
# printers via the Brother API.
class LabelRepository
  def initialize(dir)
    @dir = dir
    FileUtils.mkdir_p(@dir)
  end

  # type: "zpl" or "escpos"
  def all(type: nil)
    Dir.glob(File.join(@dir, '*.json')).map { |f| JSON.parse(File.read(f)) }
       .select { |l| type.nil? || l['type'] == type }
       .sort_by { |l| l['name'].downcase }
  end

  def find(id)
    path = path_for(id)
    return nil unless File.exist?(path)

    JSON.parse(File.read(path))
  end

  def save(name:, type:, content:)
    id = SecureRandom.uuid
    label = { 'id' => id, 'name' => name, 'type' => type, 'content' => content }
    File.write(path_for(id), JSON.generate(label))
    label
  end

  def delete(id)
    File.delete(path_for(id)) if File.exist?(path_for(id))
  end

  private

  def path_for(id)
    File.join(@dir, "#{id}.json")
  end
end