#!/usr/bin/env ruby
# frozen_string_literal: true

# ==========================================================
# adn/tools/cli/dasuten_backup_download.rb — Download desde Google Drive
# ==========================================================
# Flujo: Google Drive (drive_bkps-dasu) → dasu-sql4
# Uso: ruby adn/tools/cli/dasuten_backup_download.rb
# ==========================================================

require 'shellwords'

REMOTE_DRIVE = "rmonla-GDrive:drive_bkps-dasu"
LOCAL_BACKUP = "F:\\BACKUP\\sysdasuten_compressed_ADN.bak"

puts "[*] Iniciando descarga de backup desde Google Drive..."

begin
  # Paso 1: Listar backups disponibles
  puts "[1/4] Buscando backup más reciente en Drive..."
  cmd_list = "rclone lsf '#{REMOTE_DRIVE}' --files-only --order '-modified' 2>/dev/null | grep sysdasuten | head -1"
  backup_remoto = `#{cmd_list}`.strip

  if backup_remoto.empty?
    puts "[!] No se encontraron backups en #{REMOTE_DRIVE}"
    exit 1
  end

  puts "    Backup encontrado: #{backup_remoto}"

  # Paso 2: Descargar backup
  puts "[2/4] Descargando backup..."
  puts "    Origen: #{REMOTE_DRIVE}/#{backup_remoto}"
  puts "    Destino: #{LOCAL_BACKUP}"
  puts "    (Esto puede tomar 2-5 minutos)"

  cmd_download = "rclone copy '#{REMOTE_DRIVE}/#{backup_remoto}' '#{LOCAL_BACKUP}' --progress -v"
  start_download = Time.now
  system(cmd_download)

  if $?.success?
    puts "[+] Descarga completada en #{(Time.now - start_download).round(2)} segundos."
  else
    puts "[!] Error en descarga (código: #{$?.exitstatus})"
    exit 1
  end

  # Paso 3: Verificar archivo descargado
  puts "[3/4] Verificando archivo descargado..."
  cmd_verify = "powershell -Command \"(Get-Item '#{LOCAL_BACKUP}').Length\""
  tamaño = `#{cmd_verify}`.strip.to_i

  if tamaño > 0
    puts "[+] Archivo verificado: #{(tamaño / 1024.0 / 1024.0).round(2)} MB"
  else
    puts "[!] Archivo descargado parece estar vacío"
    exit 1
  end

  # Paso 4: Restaurar en SQL Server
  puts "[4/4] Preparando para restauración..."
  puts "    Backup disponible en: #{LOCAL_BACKUP}"
  puts ""
  puts "    Para restaurar, ejecutar:"
  puts "    sqlcmd -S localhost -Q \"RESTORE DATABASE sysdasuten FROM DISK = '#{LOCAL_BACKUP}' WITH REPLACE, MOVE 'sysdasuten' TO 'F:\\DATA\\sysdasuten.mdf', MOVE 'sysdasuten_log' TO 'F:\\LOG\\sysdasuten_log.ldf'\""

  puts "\n✅ Descarga completada exitosamente."

rescue => e
  puts "[!] Error fatal: #{e.message}"
  exit 1
end