//
//  NCPickerViewController.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 11/11/2018.
//  Copyright (c) 2018 Marino Faggiana. All rights reserved.
//
//  Author Marino Faggiana <marino.faggiana@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 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 UIKit
import TLPhotoPicker
import MobileCoreServices
import Photos
import NextcloudKit
import SwiftUI

// MARK: - Photo Picker

class NCPhotosPickerViewController: NSObject {
    var controller: NCMainTabBarController
    var maxSelectedAssets = 1
    var singleSelectedMode = false

    @discardableResult
    init(controller: NCMainTabBarController, maxSelectedAssets: Int, singleSelectedMode: Bool) {
        self.controller = controller
        super.init()

        self.maxSelectedAssets = maxSelectedAssets
        self.singleSelectedMode = singleSelectedMode

        self.openPhotosPickerViewController { assets in
            if !assets.isEmpty {
                DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
                    let model = NCUploadAssetsModel(assets: assets, serverUrl: controller.currentServerUrl(), controller: controller)
                    let view = NCUploadAssetsView(model: model)
                    let viewController = UIHostingController(rootView: view)
                    controller.present(viewController, animated: true, completion: nil)
                }
            }
        }
    }

    private func openPhotosPickerViewController(completition: @escaping ([TLPHAsset]) -> Void) {
        var configure = TLPhotosPickerConfigure()

        configure.cancelTitle = NSLocalizedString("_cancel_", comment: "")
        configure.doneTitle = NSLocalizedString("_done_", comment: "")
        configure.emptyMessage = NSLocalizedString("_no_albums_", comment: "")
        configure.tapHereToChange = NSLocalizedString("_tap_here_to_change_", comment: "")

        if maxSelectedAssets > 0 {
            configure.maxSelectedAssets = maxSelectedAssets
        }
        configure.selectedColor = NCBrandColor.shared.getElement(account: controller.account)
        configure.singleSelectedMode = singleSelectedMode
        configure.allowedAlbumCloudShared = true

        let viewController = customPhotoPickerViewController(withTLPHAssets: { assets in
            completition(assets)
        }, didCancel: nil)
        viewController.didExceedMaximumNumberOfSelection = { _ in
            let error = NKError(errorCode: NCGlobal.shared.errorInternalError, errorDescription: "_limited_dimension_")
            NCContentPresenter().showError(error: error)
        }
        viewController.handleNoAlbumPermissions = { _ in
            let error = NKError(errorCode: NCGlobal.shared.errorInternalError, errorDescription: "_denied_album_")
            NCContentPresenter().showError(error: error)
        }
        viewController.handleNoCameraPermissions = { _ in
            let error = NKError(errorCode: NCGlobal.shared.errorInternalError, errorDescription: "_denied_camera_")
            NCContentPresenter().showError(error: error)
        }
        viewController.configure = configure

        controller.present(viewController, animated: true, completion: nil)
    }
}

class customPhotoPickerViewController: TLPhotosPickerViewController {
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }

    override func makeUI() {
        super.makeUI()

        self.customNavItem.leftBarButtonItem?.tintColor = NCBrandColor.shared.iconImageColor
        self.customNavItem.rightBarButtonItem?.tintColor = NCBrandColor.shared.iconImageColor
    }
}

// MARK: - Document Picker

class NCDocumentPickerViewController: NSObject, UIDocumentPickerDelegate {
    let appDelegate = (UIApplication.shared.delegate as? AppDelegate)!
    let utilityFileSystem = NCUtilityFileSystem()
    let database = NCManageDatabase.shared
    var isViewerMedia: Bool
    var viewController: UIViewController?
    var controller: NCMainTabBarController

    @discardableResult
    init (controller: NCMainTabBarController, isViewerMedia: Bool, allowsMultipleSelection: Bool, viewController: UIViewController? = nil) {
        self.controller = controller
        self.isViewerMedia = isViewerMedia
        self.viewController = viewController
        super.init()

        let documentProviderMenu = UIDocumentPickerViewController(forOpeningContentTypes: [UTType.data])

        documentProviderMenu.modalPresentationStyle = .formSheet
        documentProviderMenu.allowsMultipleSelection = allowsMultipleSelection
        documentProviderMenu.popoverPresentationController?.sourceView = controller.tabBar
        documentProviderMenu.popoverPresentationController?.sourceRect = controller.tabBar.bounds
        documentProviderMenu.delegate = self

        controller.present(documentProviderMenu, animated: true, completion: nil)
    }

    func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
        let session = NCSession.shared.getSession(controller: self.controller)
        if isViewerMedia,
           let urlIn = urls.first,
           let url = self.copySecurityScopedResource(url: urlIn, urlOut: FileManager.default.temporaryDirectory.appendingPathComponent(urlIn.lastPathComponent)),
           let viewController = self.viewController {
            let ocId = NSUUID().uuidString
            let fileName = url.lastPathComponent
            let metadata = database.createMetadata(fileName: fileName,
                                                   fileNameView: fileName,
                                                   ocId: ocId,
                                                   serverUrl: "",
                                                   url: url.path,
                                                   contentType: "",
                                                   session: session,
                                                   sceneIdentifier: self.controller.sceneIdentifier)

            if metadata.classFile == NKCommon.TypeClassFile.unknow.rawValue {
                metadata.classFile = NKCommon.TypeClassFile.video.rawValue
            }

            if let fileNameError = FileNameValidator.shared.checkFileName(metadata.fileNameView, account: self.controller.account) {
                self.controller.present(UIAlertController.warning(message: "\(fileNameError.errorDescription) \(NSLocalizedString("_please_rename_file_", comment: ""))"), animated: true)
            } else {
                database.addMetadata(metadata)
                NCViewer().view(viewController: viewController, metadata: metadata)
            }

        } else {
            let serverUrl = self.controller.currentServerUrl()
            var metadatas = [tableMetadata]()
            var metadatasInConflict = [tableMetadata]()

            for urlIn in urls {
                let ocId = NSUUID().uuidString
                let fileName = urlIn.lastPathComponent
                let newFileName = FileAutoRenamer.shared.rename(fileName, account: session.account)

                let toPath = utilityFileSystem.getDirectoryProviderStorageOcId(ocId, fileNameView: newFileName)
                let urlOut = URL(fileURLWithPath: toPath)

                guard self.copySecurityScopedResource(url: urlIn, urlOut: urlOut) != nil else { continue }

                let metadataForUpload = database.createMetadata(fileName: newFileName,
                                                                fileNameView: newFileName,
                                                                ocId: ocId,
                                                                serverUrl: serverUrl,
                                                                url: "",
                                                                contentType: "",
                                                                session: session,
                                                                sceneIdentifier: self.controller.sceneIdentifier)

                metadataForUpload.session = NCNetworking.shared.sessionUploadBackground
                metadataForUpload.sessionSelector = NCGlobal.shared.selectorUploadFile
                metadataForUpload.size = utilityFileSystem.getFileSize(filePath: toPath)
                metadataForUpload.status = NCGlobal.shared.metadataStatusWaitUpload
                metadataForUpload.sessionDate = Date()

                if database.getMetadataConflict(account: session.account, serverUrl: serverUrl, fileNameView: fileName) != nil {
                    metadatasInConflict.append(metadataForUpload)
                } else {
                    metadatas.append(metadataForUpload)
                }
            }

            var invalidNameIndexes: [Int] = []

            for (index, metadata) in metadatas.enumerated() {
                if let fileNameError = FileNameValidator.shared.checkFileName(metadata.fileName, account: session.account) {
                    if metadatas.count == 1 {
                        let alert = UIAlertController.renameFile(fileName: metadata.fileName, account: session.account) { newFileName in
                            metadatas[index].fileName = newFileName
                            metadatas[index].fileNameView = newFileName

                            NCNetworkingProcess.shared.createProcessUploads(metadatas: metadatas)
                        }

                        self.controller.present(alert, animated: true)
                        return
                    } else {
                        self.controller.present(UIAlertController.warning(message: "\(fileNameError.errorDescription) \(NSLocalizedString("_please_rename_file_", comment: ""))"), animated: true)
                        invalidNameIndexes.append(index)
                    }
                }
            }

            for index in invalidNameIndexes.reversed() {
                metadatas.remove(at: index)
            }

            NCNetworkingProcess.shared.createProcessUploads(metadatas: metadatas)

            if !metadatasInConflict.isEmpty {
                if let conflict = UIStoryboard(name: "NCCreateFormUploadConflict", bundle: nil).instantiateInitialViewController() as? NCCreateFormUploadConflict {
                    conflict.account = self.controller.account
                    conflict.delegate = appDelegate
                    conflict.serverUrl = serverUrl
                    conflict.metadatasUploadInConflict = metadatasInConflict

                    self.controller.present(conflict, animated: true, completion: nil)
                }
            }
        }
    }

    func copySecurityScopedResource(url: URL, urlOut: URL) -> URL? {
        try? FileManager.default.removeItem(at: urlOut)
        if url.startAccessingSecurityScopedResource() {
            do {
                try FileManager.default.copyItem(at: url, to: urlOut)
                url.stopAccessingSecurityScopedResource()
                return urlOut
            } catch {
            }
        }
        return nil
    }
}