//
//  NCViewerMedia.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 24/10/2020.
//  Copyright © 2020 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 SVGKit
import NextcloudKit
import EasyTipView
import SwiftUI
import MobileVLCKit
import JGProgressHUD
import Alamofire

public protocol NCViewerMediaViewDelegate: AnyObject {
    func didOpenDetail()
    func didCloseDetail()
}

class NCViewerMedia: UIViewController {
    @IBOutlet weak var detailViewTopConstraint: NSLayoutConstraint!
    @IBOutlet weak var imageViewTopConstraint: NSLayoutConstraint!
    @IBOutlet weak var imageViewBottomConstraint: NSLayoutConstraint!
    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet weak var imageVideoContainer: UIImageView!
    @IBOutlet weak var statusViewImage: UIImageView!
    @IBOutlet weak var statusLabel: UILabel!
    @IBOutlet weak var detailView: NCViewerMediaDetailView!

    private var tipView: EasyTipView?
    private let player = VLCMediaPlayer()

    let appDelegate = UIApplication.shared.delegate as! AppDelegate
    weak var viewerMediaPage: NCViewerMediaPage?
    var playerToolBar: NCPlayerToolBar?
    var ncplayer: NCPlayer?
    var image: UIImage?
    var metadata: tableMetadata = tableMetadata()
    var index: Int = 0
    var doubleTapGestureRecognizer: UITapGestureRecognizer = UITapGestureRecognizer()
    var imageViewConstraint: CGFloat = 0
    var isDetailViewInitializze: Bool = false
    weak var delegate: NCViewerMediaViewDelegate?

    // MARK: - View Life Cycle

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

        doubleTapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(didDoubleTapWith(gestureRecognizer:)))
        doubleTapGestureRecognizer.numberOfTapsRequired = 2
    }

    deinit {
        print("deinit NCViewerMedia")

        self.tipView?.dismiss()
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterOpenMediaDetail), object: nil)
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        scrollView.delegate = self
        scrollView.maximumZoomScale = 4
        scrollView.minimumZoomScale = 1

        view.addGestureRecognizer(doubleTapGestureRecognizer)

        if NCManageDatabase.shared.getMetadataLivePhoto(metadata: metadata) != nil {
            statusViewImage.image = NCUtility.shared.loadImage(named: "livephoto", color: .gray)
            statusLabel.text = "LIVE"
        } else {
            statusViewImage.image = nil
            statusLabel.text = ""
        }

        if metadata.isAudioOrVideo {

            playerToolBar = Bundle.main.loadNibNamed("NCPlayerToolBar", owner: self, options: nil)?.first as? NCPlayerToolBar
            if let playerToolBar = playerToolBar {
                view.addSubview(playerToolBar)
                playerToolBar.translatesAutoresizingMaskIntoConstraints = false
                playerToolBar.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
                playerToolBar.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
                playerToolBar.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
                playerToolBar.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
            }

            self.ncplayer = NCPlayer(imageVideoContainer: self.imageVideoContainer, playerToolBar: self.playerToolBar, metadata: self.metadata, viewerMediaPage: self.viewerMediaPage)
        }

        // TIP
        var preferences = EasyTipView.Preferences()
        preferences.drawing.foregroundColor = .white
        preferences.drawing.backgroundColor = NCBrandColor.shared.nextcloud
        preferences.drawing.textAlignment = .left
        preferences.drawing.arrowPosition = .bottom
        preferences.drawing.cornerRadius = 10

        preferences.animating.dismissTransform = CGAffineTransform(translationX: 0, y: -15)
        preferences.animating.showInitialTransform = CGAffineTransform(translationX: 0, y: -15)
        preferences.animating.showInitialAlpha = 0
        preferences.animating.showDuration = 0.5
        preferences.animating.dismissDuration = 0

        tipView = EasyTipView(text: NSLocalizedString("_tip_open_mediadetail_", comment: ""), preferences: preferences, delegate: self)

        detailViewTopConstraint.constant = 0
        detailView.hide()

        self.image = nil
        self.imageVideoContainer.image = nil

        loadImage()
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        viewerMediaPage?.navigationController?.navigationBar.prefersLargeTitles = false
        viewerMediaPage?.navigationItem.title = (metadata.fileNameView as NSString).deletingPathExtension

        if metadata.isImage, let viewerMediaPage = self.viewerMediaPage {
            if viewerMediaPage.modifiedOcId.contains(metadata.ocId) {
                viewerMediaPage.modifiedOcId.removeAll(where: { $0 == metadata.ocId })
                loadImage()
            }
        }
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        viewerMediaPage?.clearCommandCenter()

        if metadata.isAudioOrVideo {
            if let ncplayer = self.ncplayer {
                if ncplayer.url == nil {
                    NCActivityIndicator.shared.startActivity(backgroundView: self.view, style: .medium)
                    NCNetworking.shared.getVideoUrl(metadata: metadata) { url, autoplay, error in
                        NCActivityIndicator.shared.stop()
                        if error == .success, let url = url {
                            ncplayer.openAVPlayer(url: url, autoplay: autoplay)
                        } else {
                            var downloadRequest: DownloadRequest?

                            let hud = JGProgressHUD()
                            hud.indicatorView = JGProgressHUDRingIndicatorView()
                            hud.textLabel.text = NSLocalizedString("_downloading_", comment: "")
                            hud.detailTextLabel.text = NSLocalizedString("_tap_to_cancel_", comment: "")
                            if let indicatorView = hud.indicatorView as? JGProgressHUDRingIndicatorView { indicatorView.ringWidth = 1.5 }
                            hud.tapOnHUDViewBlock = { _ in
                                if let request = downloadRequest {
                                    request.cancel()
                                }
                            }
                            if let view = self.appDelegate.window?.rootViewController?.view {
                                hud.show(in: view)
                            }

                            NCNetworking.shared.download(metadata: self.metadata, selector: "", notificationCenterProgressTask: false) { request in
                                downloadRequest = request
                            } progressHandler: { progress in
                                hud.progress = Float(progress.fractionCompleted)
                            } completion: { afError, error in
                                if error == .success {
                                    hud.dismiss()
                                    if CCUtility.fileProviderStorageExists(self.metadata) {
                                        let url = URL(fileURLWithPath: CCUtility.getDirectoryProviderStorageOcId(self.metadata.ocId, fileNameView: self.metadata.fileNameView))
                                        ncplayer.openAVPlayer(url: url, autoplay: autoplay)
                                    }
                                } else {
                                    hud.indicatorView = JGProgressHUDErrorIndicatorView()
                                    hud.textLabel.text = error.errorDescription
                                    hud.dismiss(afterDelay: NCGlobal.shared.dismissAfterSecond)
                                }
                            }
                        }
                    }
                } else {
                    var position: Float = 0
                    if let result = NCManageDatabase.shared.getVideo(metadata: metadata), let resultPosition = result.position {
                        position = resultPosition
                    }
                    ncplayer.restartAVPlayer(position: position, pauseAfterPlay: true)
                }
            }
        } else if metadata.isImage {
            DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
                self.showTip()
            }
        }

        NotificationCenter.default.addObserver(self, selector: #selector(openDetail(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterOpenMediaDetail), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(closeDetail(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterDownloadStartFile), object: nil)
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)

        self.tipView?.dismiss()
    }

    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)

        if let ncplayer = ncplayer, ncplayer.isPlay() {
            ncplayer.playerPause()
        }
    }

    override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {

        if UIDevice.current.orientation.isValidInterfaceOrientation {
            closeDetail()
        }

        self.tipView?.dismiss()
        if metadata.isVideo {
            self.imageVideoContainer.isHidden = true
        }

        super.viewWillTransition(to: size, with: coordinator)

        coordinator.animate(alongsideTransition: { context in
            // back to the original size
            self.scrollView.zoom(to: CGRect(x: 0, y: 0, width: self.scrollView.bounds.width, height: self.scrollView.bounds.height), animated: false)
            self.view.layoutIfNeeded()
            UIView.animate(withDuration: context.transitionDuration) {
                if self.detailView.isShown {
                    self.openDetail()
                }
            }
        }, completion: { context in
            self.showTip()
            if self.metadata.isVideo {
                self.imageVideoContainer.isHidden = false
            }
        })
    }

    // MARK: - Tip

    func showTip() {
        if !NCManageDatabase.shared.tipExists(NCGlobal.shared.tipNCViewerMediaDetailView) {
            self.tipView?.show(forView: detailView)
        }
    }

    // MARK: - Image

    func loadImage() {

        guard let metadata = NCManageDatabase.shared.getMetadataFromOcId(metadata.ocId) else { return }
        self.metadata = metadata

        // Download image
        if !CCUtility.fileProviderStorageExists(metadata) && metadata.isImage && metadata.session == "" {

            if metadata.livePhoto {
                let fileName = (metadata.fileNameView as NSString).deletingPathExtension + ".mov"
                if let metadata = NCManageDatabase.shared.getMetadata(predicate: NSPredicate(format: "account == %@ AND serverUrl == %@ AND fileNameView LIKE[c] %@", metadata.account, metadata.serverUrl, fileName)), !CCUtility.fileProviderStorageExists(metadata) {
                    NCNetworking.shared.download(metadata: metadata, selector: "") { _, _ in }
                }
            }
        }

        // Get image
        let image = getImageMetadata(metadata)
        if self.metadata.ocId == metadata.ocId {
            self.image = image
            self.imageVideoContainer.image = image
        }

        func getImageMetadata(_ metadata: tableMetadata) -> UIImage? {

            if let image = getImage(metadata: metadata) {
                return image
            }

            if metadata.isVideo && !metadata.hasPreview {
                NCUtility.shared.createImageFrom(fileNameView: metadata.fileNameView, ocId: metadata.ocId, etag: metadata.etag, classFile: metadata.classFile)
            }

            if CCUtility.fileProviderStoragePreviewIconExists(metadata.ocId, etag: metadata.etag) {
                if let imagePreviewPath = CCUtility.getDirectoryProviderStoragePreviewOcId(metadata.ocId, etag: metadata.etag) {
                    return UIImage(contentsOfFile: imagePreviewPath)
                }
            }

            if metadata.isAudio {
                return UIImage(named: "noPreviewAudio")!.image(color: .gray, size: view.frame.width)
            } else if metadata.isImage {
                return UIImage(named: "noPreview")!.image(color: .gray, size: view.frame.width)
            } else {
                return nil
            }
        }

        func getImage(metadata: tableMetadata) -> UIImage? {

            let ext = CCUtility.getExtension(metadata.fileNameView)
            var image: UIImage?

            if CCUtility.fileProviderStorageExists(metadata) && metadata.isImage {

                let previewPath = CCUtility.getDirectoryProviderStoragePreviewOcId(metadata.ocId, etag: metadata.etag)!
                let imagePath = CCUtility.getDirectoryProviderStorageOcId(metadata.ocId, fileNameView: metadata.fileNameView)!

                if ext == "GIF" {
                    if !FileManager().fileExists(atPath: previewPath) {
                        NCUtility.shared.createImageFrom(fileNameView: metadata.fileNameView, ocId: metadata.ocId, etag: metadata.etag, classFile: metadata.classFile)
                    }
                    image = UIImage.animatedImage(withAnimatedGIFURL: URL(fileURLWithPath: imagePath))
                } else if ext == "SVG" {
                    if let svgImage = SVGKImage(contentsOfFile: imagePath) {
                        svgImage.size = CGSize(width: NCGlobal.shared.sizePreview, height: NCGlobal.shared.sizePreview)
                        if let image = svgImage.uiImage {
                            if !FileManager().fileExists(atPath: previewPath) {
                                do {
                                    try image.pngData()?.write(to: URL(fileURLWithPath: previewPath), options: .atomic)
                                } catch { }
                            }
                            return image
                        } else {
                            return nil
                        }
                    } else {
                        return nil
                    }
                } else {
                    NCUtility.shared.createImageFrom(fileNameView: metadata.fileNameView, ocId: metadata.ocId, etag: metadata.etag, classFile: metadata.classFile)
                    image = UIImage(contentsOfFile: imagePath)
                }
            }

            return image
        }
    }

    // MARK: - Live Photo

    func playLivePhoto(filePath: String) {

        updateViewConstraints()
        statusViewImage.isHidden = true
        statusLabel.isHidden = true

        player.media = VLCMedia(url: URL(fileURLWithPath: filePath))
        player.drawable = imageVideoContainer
        player.play()
    }

    func stopLivePhoto() {

        player.stop()

        statusViewImage.isHidden = false
        statusLabel.isHidden = false
    }

    // MARK: - Gesture

    @objc func didDoubleTapWith(gestureRecognizer: UITapGestureRecognizer) {

        guard metadata.isImage, !detailView.isShown else { return }

        let pointInView = gestureRecognizer.location(in: self.imageVideoContainer)
        var newZoomScale = self.scrollView.maximumZoomScale

        if self.scrollView.zoomScale >= newZoomScale || abs(self.scrollView.zoomScale - newZoomScale) <= 0.01 {
            newZoomScale = self.scrollView.minimumZoomScale
        }

        let width = self.scrollView.bounds.width / newZoomScale
        let height = self.scrollView.bounds.height / newZoomScale
        let originX = pointInView.x - (width / 2.0)
        let originY = pointInView.y - (height / 2.0)
        let rectToZoomTo = CGRect(x: originX, y: originY, width: width, height: height)
        self.scrollView.zoom(to: rectToZoomTo, animated: true)
    }

    @objc func didPanWith(gestureRecognizer: UIPanGestureRecognizer) {

        guard metadata.isImage else { return }

        let currentLocation = gestureRecognizer.translation(in: self.view)

        switch gestureRecognizer.state {
        case .ended:
            if detailView.isShown {
                self.imageViewTopConstraint.constant = -imageViewConstraint
                self.imageViewBottomConstraint.constant = imageViewConstraint
            } else {
                self.imageViewTopConstraint.constant = 0
                self.imageViewBottomConstraint.constant = 0
            }

        case .changed:
            imageViewTopConstraint.constant = (currentLocation.y - imageViewConstraint)
            imageViewBottomConstraint.constant = -(currentLocation.y - imageViewConstraint)

            // DISMISS VIEW
            if detailView.isHidden && (currentLocation.y > 20) {

                viewerMediaPage?.navigationController?.popViewController(animated: true)
                gestureRecognizer.state = .ended
            }

            // CLOSE DETAIL
            if !detailView.isHidden && (currentLocation.y > 20) {

                self.closeDetail()
                gestureRecognizer.state = .ended
            }

            // OPEN DETAIL
            if detailView.isHidden && (currentLocation.y < -20) {

                self.openDetail()
                gestureRecognizer.state = .ended
            }

        default:
            break
        }
    }
}

extension NCViewerMedia {
    @objc func openDetail(_ notification: NSNotification) {
        if let userInfo = notification.userInfo as NSDictionary?, let ocId = userInfo["ocId"] as? String, ocId == metadata.ocId {
            openDetail()
        }
    }

    @objc func closeDetail(_ notification: NSNotification) {
        closeDetail()
    }

    func toggleDetail () {
        detailView.isShown ? closeDetail() : openDetail()
    }

    private func openDetail() {
        delegate?.didOpenDetail()
        self.dismissTip()

        statusLabel.isHidden = true
        statusViewImage.isHidden = true

        NCUtility.shared.getExif(metadata: metadata) { exif in
            self.view.layoutIfNeeded()
            self.showDetailView(exif: exif)

            if let image = self.imageVideoContainer.image {
                let ratioW = self.imageVideoContainer.frame.width / image.size.width
                let ratioH = self.imageVideoContainer.frame.height / image.size.height
                let ratio = min(ratioW, ratioH)
                let imageHeight = image.size.height * ratio
                let imageContainerHeight = self.imageVideoContainer.frame.height * ratio
                let height = max(imageHeight, imageContainerHeight)
                self.imageViewConstraint = self.detailView.frame.height - ((self.view.frame.height - height) / 2) + self.view.safeAreaInsets.bottom
                if self.imageViewConstraint < 0 { self.imageViewConstraint = 0 }
            }

            UIView.animate(withDuration: 0.3) {
                self.imageViewTopConstraint.constant = -self.imageViewConstraint
                self.imageViewBottomConstraint.constant = self.imageViewConstraint
                self.detailViewTopConstraint.constant = self.detailView.frame.height
                self.view.layoutIfNeeded()
            }

            self.scrollView.pinchGestureRecognizer?.isEnabled = false
        }
    }

    private func closeDetail() {
        delegate?.didCloseDetail()
        self.detailView.hide()
        imageViewConstraint = 0

        statusLabel.isHidden = false
        statusViewImage.isHidden = false

        UIView.animate(withDuration: 0.3) {
            self.imageViewTopConstraint.constant = 0
            self.imageViewBottomConstraint.constant = 0
            self.detailViewTopConstraint.constant = 0
            self.view.layoutIfNeeded()
        }

        scrollView.pinchGestureRecognizer?.isEnabled = true
    }

    private func showDetailView(exif: ExifData) {
        self.detailView.show(
            metadata: self.metadata,
            image: self.image,
            textColor: self.viewerMediaPage?.textColor,
            exif: exif,
            ncplayer: self.ncplayer,
            delegate: self)
    }

    func reloadDetail() {
        if self.detailView.isShown {
            NCUtility.shared.getExif(metadata: metadata) { exif in
                self.showDetailView(exif: exif)
            }
        }
    }
}

extension NCViewerMedia: UIScrollViewDelegate {

    func viewForZooming(in scrollView: UIScrollView) -> UIView? {
        return imageVideoContainer
    }

    func scrollViewDidZoom(_ scrollView: UIScrollView) {

        if scrollView.zoomScale > 1 {
            if let image = imageVideoContainer.image {

                let ratioW = imageVideoContainer.frame.width / image.size.width
                let ratioH = imageVideoContainer.frame.height / image.size.height
                let ratio = ratioW < ratioH ? ratioW : ratioH
                let newWidth = image.size.width * ratio
                let newHeight = image.size.height * ratio
                let conditionLeft = newWidth * scrollView.zoomScale > imageVideoContainer.frame.width
                let left = 0.5 * (conditionLeft ? newWidth - imageVideoContainer.frame.width : (scrollView.frame.width - scrollView.contentSize.width))
                let conditioTop = newHeight * scrollView.zoomScale > imageVideoContainer.frame.height

                let top = 0.5 * (conditioTop ? newHeight - imageVideoContainer.frame.height : (scrollView.frame.height - scrollView.contentSize.height))

                scrollView.contentInset = UIEdgeInsets(top: top, left: left, bottom: top, right: left)
            }
        } else {
            scrollView.contentInset = .zero
        }
    }

    func scrollViewDidScroll(_ scrollView: UIScrollView) {
    }
}

extension NCViewerMedia: NCViewerMediaDetailViewDelegate {

    func downloadFullResolution() {
        NCNetworking.shared.download(metadata: metadata, selector: NCGlobal.shared.selectorOpenDetail) { _, _ in }
    }
}

extension NCViewerMedia: EasyTipViewDelegate {

    // TIP
    func easyTipViewDidTap(_ tipView: EasyTipView) {
        NCManageDatabase.shared.addTip(NCGlobal.shared.tipNCViewerMediaDetailView)
    }

    func easyTipViewDidDismiss(_ tipView: EasyTipView) { }

    func dismissTip() {
        NCManageDatabase.shared.addTip(NCGlobal.shared.tipNCViewerMediaDetailView)
        self.tipView?.dismiss()
    }
}