/*
 * Tinc App, an Android binding and user interface for the tinc mesh VPN daemon
 * Copyright (C) 2017-2020 Pacien TRAN-GIRARD
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package org.pacien.tincapp.context

import org.apache.commons.io.FileExistsException
import org.apache.commons.io.FileUtils
import org.slf4j.LoggerFactory

/**
 * Migrates the configuration from the external storage (used before version 0.32) to the internal storage.
 *
 * @author pacien
 */
class ConfigurationDirectoryMigrator {
  private val log by lazy { LoggerFactory.getLogger(this.javaClass)!! }
  private val context by lazy { App.getContext() }
  private val paths = AppPaths

  fun migrate() {
    migrateConfigurationDirectory()
    migrateLogDirectory()
  }

  private fun migrateConfigurationDirectory() {
    val oldConfigDir = context.getExternalFilesDir(null)
    if (oldConfigDir == null || oldConfigDir.listFiles().isNullOrEmpty()) return // nothing to do

    log.info("Configuration files present in old configuration directory at {}.", oldConfigDir.absolutePath)
    for (oldConfig in oldConfigDir.listFiles() ?: emptyArray()) {
      try {
        log.info("Migrating {} to {}", oldConfig.absolutePath, paths.confDir())
        FileUtils.moveToDirectory(oldConfig, paths.confDir(), true)
      } catch (e: FileExistsException) {
        log.warn("Could not migrate {}: target already exists.", oldConfig.absolutePath)
      }
    }
  }

  private fun migrateLogDirectory() {
    val oldLogDir = context.externalCacheDir
    if (oldLogDir == null || oldLogDir.listFiles().isNullOrEmpty()) return // nothing to do

    // There's no point moving the log files. Let's delete those instead.
    log.info("Clearing old cache directory at {}", oldLogDir.absolutePath)
    FileUtils.cleanDirectory(oldLogDir)
  }
}