//
//  CloudDrivePreviewViewController.swift
//  suixinkan
//

import AVKit
import Kingfisher
import SnapKit
import UIKit

/// 云盘文件预览页，黑底展示图片或视频。
final class CloudDrivePreviewViewController: BaseViewController {
    private let file: CloudFile
    private let imageView = UIImageView()
    private var playerViewController: AVPlayerViewController?

    /// 初始化预览页。
    init(file: CloudFile) {
        self.file = file
        super.init(nibName: nil, bundle: nil)
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func setupNavigationBar() {
        title = ""
        navigationController?.navigationBar.tintColor = .white
    }

    override func setupUI() {
        view.backgroundColor = .black
        if file.isVideo {
            setupVideo()
        } else {
            setupImage()
        }
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        navigationController?.navigationBar.tintColor = AppColor.primary
        playerViewController?.player?.pause()
    }

    private func setupImage() {
        imageView.contentMode = .scaleAspectFit
        imageView.backgroundColor = .black
        view.addSubview(imageView)
        imageView.snp.makeConstraints { make in
            make.edges.equalTo(view.safeAreaLayoutGuide)
        }
        if let url = URL(string: file.fileUrl) {
            imageView.kf.setImage(with: url)
        }
    }

    private func setupVideo() {
        guard let url = URL(string: file.fileUrl) else { return }
        let player = AVPlayer(url: url)
        let controller = AVPlayerViewController()
        controller.player = player
        controller.view.backgroundColor = .black
        addChild(controller)
        view.addSubview(controller.view)
        controller.view.snp.makeConstraints { make in
            make.edges.equalTo(view.safeAreaLayoutGuide)
        }
        controller.didMove(toParent: self)
        playerViewController = controller
        player.play()
    }
}