/*
 * Copyright (C) 2023 by Claudio Cambra <claudio.cambra@nextcloud.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 2 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.
 */

import Foundation
import FileProvider

func pathForAppGroupContainer() -> URL? {
    guard let appGroupIdentifier = Bundle.main.object(forInfoDictionaryKey: "SocketApiPrefix") as? String else {
        NSLog("Could not get container url as missing SocketApiPrefix info in app Info.plist")
        return nil
    }

    return FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: appGroupIdentifier)
}

func pathForFileProviderExtData() -> URL? {
    let containerUrl = pathForAppGroupContainer()
    return containerUrl?.appendingPathComponent("FileProviderExt/")
}

func pathForFileProviderExtFiles() -> URL? {
    let fileProviderDataUrl = pathForFileProviderExtData()
    return fileProviderDataUrl?.appendingPathComponent("Files/")
}

@discardableResult func localPathForNCDirectory(ocId: String) throws -> URL {
    guard let fileProviderFilesPathUrl = pathForFileProviderExtFiles() else {
        throw URLError(.badURL)
    }

    let folderPathUrl = fileProviderFilesPathUrl.appendingPathComponent(ocId)
    let folderPath = folderPathUrl.path

    if !FileManager.default.fileExists(atPath: folderPath) {
        try FileManager.default.createDirectory(at: folderPathUrl, withIntermediateDirectories: true)
    }

    return folderPathUrl
}

@discardableResult func localPathForNCDirectory(directoryMetadata: NextcloudDirectoryMetadataTable) throws -> URL {
    let ocId = directoryMetadata.ocId
    return try localPathForNCDirectory(ocId: ocId)
}

@discardableResult func localPathForNCDirectory(itemMetadata: NextcloudItemMetadataTable) throws -> URL {
    let ocId = itemMetadata.ocId
    return try localPathForNCDirectory(ocId: ocId)
}

@discardableResult func localPathForNCFile(ocId: String, fileNameView: String) throws -> URL {
    let fileFolderPathUrl = try localPathForNCDirectory(ocId: ocId)
    let filePathUrl = fileFolderPathUrl.appendingPathComponent(fileNameView)
    let filePath = filePathUrl.path

    if !FileManager.default.fileExists(atPath: filePath) {
        FileManager.default.createFile(atPath: filePath, contents: nil)
    }

    return filePathUrl
}

@discardableResult func localPathForNCFile(itemMetadata: NextcloudItemMetadataTable) throws -> URL {
    let ocId = itemMetadata.ocId
    let fileNameView = itemMetadata.fileNameView
    return try localPathForNCFile(ocId: ocId, fileNameView: fileNameView)
}

func createFileOrDirectoryLocally(metadata: NextcloudItemMetadataTable) {
    do {
        if metadata.directory {
            try localPathForNCDirectory(ocId: metadata.ocId)
        } else {
            try localPathForNCFile(itemMetadata: metadata)
        }
    } catch let error {
        NSLog("Could not create NC file or directory locally, received error: %@", error.localizedDescription)
    }
}

func parentItemIdentifierFromMetadata(_ metadata: NextcloudItemMetadataTable) -> NSFileProviderItemIdentifier? {
    let homeServerFilesUrl = metadata.urlBase + "/remote.php/dav/files/" + metadata.userId

    if metadata.serverUrl == homeServerFilesUrl {
        return .rootContainer
    }

    let ncDatabase = NextcloudFilesDatabaseManager.shared
    guard let itemParentDirectory = ncDatabase.parentDirectoryMetadataForItem(metadata) else {
        NSLog("Could not get item parent directory metadata for metadata with ocId: %@ and fileName: %@, returning nil", metadata.ocId, metadata.fileName)
        return nil
    }

    if let parentDirectoryMetadata = ncDatabase.itemMetadataFromOcId(itemParentDirectory.ocId) {
        return NSFileProviderItemIdentifier(parentDirectoryMetadata.ocId)
    }

    NSLog("Could not get item parent directory item metadata for metadata with ocId: %@ and fileName: %@, returning nil", metadata.ocId, metadata.fileName)
    return nil
}

func isFileSynced(metadata: NextcloudItemMetadataTable) -> Bool {
    guard metadata.directory else { return false }
    do {
        let localPathForFile = try localPathForNCFile(itemMetadata: metadata)
        let localFileAttributes = try FileManager.default.attributesOfItem(atPath: localPathForFile.path)
        let localFileSize = localFileAttributes[.size] as? Int64

        return localFileSize == metadata.size
    } catch let error {
        NSLog("Could not check if file %@ is synced, received error: %@", metadata.fileNameView, error.localizedDescription)
    }

    return false
}