/*
 * Nextcloud Talk application
 *
 * @author Mario Danic
 * Copyright (C) 2017 Mario Danic <mario@lovelyhq.com>
 *
 * 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 <http://www.gnu.org/licenses/>.
 *
 * Parts related to account import were either copied from or inspired by the great work done by David Luhmer at:
 * https://github.com/nextcloud/ownCloud-Account-Importer
 */

package com.nextcloud.talk.utils

import android.accounts.Account
import android.accounts.AccountManager
import android.content.Context
import android.content.pm.PackageManager
import android.util.Log
import com.nextcloud.talk.R
import com.nextcloud.talk.application.NextcloudTalkApplication
import com.nextcloud.talk.models.ImportAccount
import com.nextcloud.talk.models.database.UserEntity
import com.nextcloud.talk.newarch.local.models.UserNgEntity
import java.util.ArrayList
import java.util.Arrays

object AccountUtils {

  private val TAG = "AccountUtils"

  fun findAccounts(userEntitiesList: List<UserNgEntity>): List<Account> {
    val context = NextcloudTalkApplication.sharedApplication!!.applicationContext
    val accMgr = AccountManager.get(context)
    val accounts = accMgr.getAccountsByType(context.getString(R.string.nc_import_account_type))

    val accountsAvailable = ArrayList<Account>()
    var importAccount: ImportAccount
    var internalUserEntity: UserNgEntity
    var accountFound: Boolean
    for (account in accounts) {
      accountFound = false

      for (i in userEntitiesList.indices) {
        internalUserEntity = userEntitiesList[i]
        importAccount = getInformationFromAccount(account)
        if (importAccount.token != null) {
          if (importAccount.baseUrl.startsWith("http://") || importAccount.baseUrl.startsWith(
                  "https://"
              )
          ) {
            if (internalUserEntity.username == importAccount.username && internalUserEntity.baseUrl == importAccount.baseUrl) {
              accountFound = true
              break
            }
          } else {
            if (internalUserEntity.username == importAccount.username && (internalUserEntity
                    .baseUrl == "http://" + importAccount.baseUrl ||
                    internalUserEntity.baseUrl == "https://" + importAccount
                    .baseUrl)
            ) {
              accountFound = true
              break
            }

          }
        } else {
          accountFound = true
          break
        }
      }

      if (!accountFound) {
        accountsAvailable.add(account)
      }
    }

    return accountsAvailable
  }

  fun getAppNameBasedOnPackage(packageName: String): String {
    val context = NextcloudTalkApplication.sharedApplication!!.applicationContext
    val packageManager = context.packageManager
    var appName = ""
    try {
      appName = packageManager.getApplicationLabel(
          packageManager.getApplicationInfo(
              packageName,
              PackageManager.GET_META_DATA
          )
      ) as String
    } catch (e: PackageManager.NameNotFoundException) {
      Log.e(TAG, "Failed to get app name based on package")
    }

    return appName
  }

  fun canWeOpenFilesApp(
    context: Context,
    accountName: String
  ): Boolean {
    val pm = context.packageManager
    try {
      val packageInfo = pm.getPackageInfo(context.getString(R.string.nc_import_accounts_from), 0)
      if (packageInfo.versionCode >= 30060151) {
        val ownSignatures = pm.getPackageInfo(context.packageName, PackageManager.GET_SIGNATURES)
            .signatures
        val filesAppSignatures = pm.getPackageInfo(
            context.getString(R.string.nc_import_accounts_from), PackageManager.GET_SIGNATURES
        )
            .signatures

        if (Arrays.equals(ownSignatures, filesAppSignatures)) {
          val accMgr = AccountManager.get(context)
          val accounts =
            accMgr.getAccountsByType(context.getString(R.string.nc_import_account_type))
          for (account in accounts) {
            if (account.name == accountName) {
              return true
            }
          }
        } else {
          return true
        }
      }
    } catch (appNotFoundException: PackageManager.NameNotFoundException) {

    }

    return false
  }

  fun getInformationFromAccount(account: Account): ImportAccount {
    val lastAtPos = account.name.lastIndexOf("@")
    var urlString = account.name.substring(lastAtPos + 1)
    val username = account.name.substring(0, lastAtPos)

    val context = NextcloudTalkApplication.sharedApplication!!.applicationContext
    val accMgr = AccountManager.get(context)

    var password: String? = null
    try {
      password = accMgr.getPassword(account)
    } catch (exception: Exception) {
      Log.e(TAG, "Failed to import account")
    }

    if (urlString.endsWith("/")) {
      urlString = urlString.substring(0, urlString.length - 1)
    }

    return ImportAccount(username, password, urlString)
  }
}