//
//  NCNetworkingE2EEDelete.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 09/11/22.
//  Copyright © 2022 Marino Faggiana. All rights reserved.
//
//  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/>.
//

import Foundation
import NextcloudKit

class NCNetworkingE2EEDelete: NSObject {

    func delete(metadata: tableMetadata) async -> NKError {

        guard let directory = NCManageDatabase.shared.getTableDirectory(predicate: NSPredicate(format: "account == %@ AND serverUrl == %@", metadata.account, metadata.serverUrl)) else {
            return NKError(errorCode: NCGlobal.shared.errorUnexpectedResponseFromDB, errorDescription: "_e2e_error_")
        }

        // TEST UPLOAD IN PROGRESS
        //
        if NCNetworkingE2EE.shared.isInUpload(account: metadata.account, serverUrl: metadata.serverUrl) {
            return NKError(errorCode: NCGlobal.shared.errorE2EEUploadInProgress, errorDescription: NSLocalizedString("_e2e_in_upload_", comment: ""))
        }

        // LOCK
        //
        let resultsLock = await NCNetworkingE2EE.shared.lock(account: metadata.account, serverUrl: metadata.serverUrl)
        guard resultsLock.error == .success, let e2eToken = resultsLock.e2eToken, let fileId = resultsLock.fileId else { return resultsLock.error }

        // DELETE FILE
        //
        let deleteMetadataPlainError = await NCNetworking.shared.deleteMetadataPlain(metadata, customHeader: ["e2e-token": e2eToken])
        guard deleteMetadataPlainError == .success else {
            await NCNetworkingE2EE.shared.unlock(account: metadata.account, serverUrl: metadata.serverUrl)
            return deleteMetadataPlainError
        }

        // DOWNLOAD METADATA
        //
        let errorDownloadMetadata = await NCNetworkingE2EE.shared.downloadMetadata(account: metadata.account, serverUrl: metadata.serverUrl, urlBase: metadata.urlBase, userId: metadata.userId, fileId: fileId, e2eToken: e2eToken)
        guard errorDownloadMetadata == .success else {
            await NCNetworkingE2EE.shared.unlock(account: metadata.account, serverUrl: metadata.serverUrl)
            return errorDownloadMetadata
        }

        // UPDATE DB
        //
        NCManageDatabase.shared.deleteE2eEncryption(predicate: NSPredicate(format: "account == %@ AND serverUrl == %@ AND fileNameIdentifier == %@", metadata.account, metadata.serverUrl, metadata.fileName))

        // UPLOAD METADATA
        //
        let uploadMetadataError = await NCNetworkingE2EE.shared.uploadMetadata(account: metadata.account,
                                                                               serverUrl: metadata.serverUrl,
                                                                               ocIdServerUrl: directory.ocId,
                                                                               fileId: fileId,
                                                                               userId: metadata.userId,
                                                                               e2eToken: e2eToken,
                                                                               method: "PUT")
        guard uploadMetadataError == .success else {
            await NCNetworkingE2EE.shared.unlock(account: metadata.account, serverUrl: metadata.serverUrl)
            return uploadMetadataError
        }

        // UNLOCK
        //
        await NCNetworkingE2EE.shared.unlock(account: metadata.account, serverUrl: metadata.serverUrl)

        return NKError()
    }
}