# app/services/dump_service.rb
class DumpService
	def self.perform
		timestamp = Time.current.strftime("%Y%m%d_%H%M%S")
		filename = "dump_#{timestamp}.sql"
		filepath = Rails.root.join("tmp", filename)
		
		db_config = ActiveRecord::Base.connection_db_config.configuration_hash
		ENV["PGPASSWORD"] = db_config[:password].to_s
		
		cmd = [
			"pg_dump",
			"-U", db_config[:username].to_s,
			"-h", (db_config[:host] || "localhost").to_s,
			"-p", (db_config[:port] || 5432).to_s,
			db_config[:database].to_s,
			"-f", filepath.to_s
		]
		
		success = system(*cmd)
		ENV["PGPASSWORD"] = nil
		
		return nil unless success
		
		zip_path = "#{filepath}.zip"
		`zip -j #{zip_path} #{filepath}`
		File.delete(filepath) if File.exist?(filepath)
		
		zip_path
	end
end