//
//  CloudDriveFileCell.swift
//  suixinkan
//

import Kingfisher
import SnapKit
import UIKit

/// 云盘文件 Cell，支持 Android 宫格与列表两种样式。
final class CloudDriveFileCell: UICollectionViewCell {
    static let reuseIdentifier = "CloudDriveFileCell"

    var onDetails: (() -> Void)?

    private let thumbnailView = UIImageView()
    private let folderIconView = UIImageView(image: CloudDriveAsset.image(named: "icon_cloud_storage_folder_type", fallbackSystemName: "folder.fill"))
    private let playIconView = UIImageView(image: CloudDriveAsset.image(named: "icon_cloud_storage_file_play", fallbackSystemName: "play.circle.fill"))
    private let extensionLabel = CloudDrivePaddingLabel()
    private let nameLabel = UILabel()
    private let detailLabel = UILabel()
    private let moreButton = UIButton(type: .system)

    private var gridConstraints: [Constraint] = []
    private var listConstraints: [Constraint] = []

    override init(frame: CGRect) {
        super.init(frame: frame)
        setupUI()
        setupConstraints()
    }

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

    override func prepareForReuse() {
        super.prepareForReuse()
        thumbnailView.kf.cancelDownloadTask()
        thumbnailView.image = nil
        folderIconView.isHidden = true
        playIconView.isHidden = true
        extensionLabel.isHidden = true
        onDetails = nil
    }

    /// 应用云盘文件数据。
    func apply(file: CloudFile, mode: CloudDriveDisplayMode) {
        nameLabel.text = file.name
        detailLabel.text = mode == .grid ? CloudDriveFormatter.typeName(file.type) : CloudDriveFormatter.fileDescription(file)
        configureThumbnail(file)
        gridConstraints.forEach { mode == .grid ? $0.activate() : $0.deactivate() }
        listConstraints.forEach { mode == .list ? $0.activate() : $0.deactivate() }
        contentView.layer.cornerRadius = mode == .grid ? AppRadius.lg : 0
        contentView.layer.borderWidth = mode == .grid ? 1 : 0
        contentView.backgroundColor = mode == .grid ? .white : .clear
        thumbnailView.layer.cornerRadius = mode == .grid ? AppRadius.lg : 0
        nameLabel.textAlignment = mode == .grid ? .left : .left
    }

    private func setupUI() {
        contentView.clipsToBounds = true
        contentView.layer.borderColor = UIColor(hex: 0xF4F4F4).cgColor

        thumbnailView.contentMode = .scaleAspectFill
        thumbnailView.clipsToBounds = true
        thumbnailView.backgroundColor = AppColor.warningBackground

        folderIconView.tintColor = AppColor.warning
        folderIconView.contentMode = .scaleAspectFit

        playIconView.tintColor = .white
        playIconView.contentMode = .scaleAspectFit
        playIconView.isHidden = true

        extensionLabel.font = .app(.caption)
        extensionLabel.textColor = .white
        extensionLabel.backgroundColor = UIColor.black.withAlphaComponent(0.5)
        extensionLabel.layer.cornerRadius = AppRadius.xs
        extensionLabel.clipsToBounds = true
        extensionLabel.isHidden = true

        nameLabel.font = .app(.body)
        nameLabel.textColor = AppColor.textPrimary
        nameLabel.numberOfLines = 1

        detailLabel.font = .app(.caption)
        detailLabel.textColor = UIColor(hex: 0x4B5563)
        detailLabel.numberOfLines = 1

        moreButton.setImage(CloudDriveAsset.image(named: "icon_cloud_storage_file_details", fallbackSystemName: "ellipsis"), for: .normal)
        moreButton.tintColor = AppColor.textSecondary
        moreButton.addTarget(self, action: #selector(moreTapped), for: .touchUpInside)

        contentView.addSubview(thumbnailView)
        contentView.addSubview(folderIconView)
        contentView.addSubview(playIconView)
        contentView.addSubview(extensionLabel)
        contentView.addSubview(nameLabel)
        contentView.addSubview(detailLabel)
        contentView.addSubview(moreButton)
    }

    private func setupConstraints() {
        thumbnailView.snp.makeConstraints { make in
            gridConstraints.append(make.top.leading.trailing.equalToSuperview().constraint)
            gridConstraints.append(make.height.equalTo(thumbnailView.snp.width).multipliedBy(0.56).constraint)
            listConstraints.append(make.leading.centerY.equalToSuperview().constraint)
            listConstraints.append(make.width.height.equalTo(48).constraint)
        }
        folderIconView.snp.makeConstraints { make in
            make.center.equalTo(thumbnailView)
            make.width.height.equalTo(42)
        }
        playIconView.snp.makeConstraints { make in
            make.center.equalTo(thumbnailView)
            make.width.height.equalTo(28)
        }
        extensionLabel.snp.makeConstraints { make in
            make.top.leading.equalTo(thumbnailView).offset(AppSpacing.xs)
        }
        nameLabel.snp.makeConstraints { make in
            gridConstraints.append(make.top.equalTo(thumbnailView.snp.bottom).offset(AppSpacing.xs).constraint)
            gridConstraints.append(make.leading.equalToSuperview().offset(AppSpacing.sm).constraint)
            listConstraints.append(make.top.equalToSuperview().offset(AppSpacing.sm).constraint)
            listConstraints.append(make.leading.equalTo(thumbnailView.snp.trailing).offset(AppSpacing.sm).constraint)
            make.trailing.equalTo(moreButton.snp.leading).offset(-AppSpacing.xs)
        }
        detailLabel.snp.makeConstraints { make in
            make.top.equalTo(nameLabel.snp.bottom).offset(AppSpacing.xxs)
            make.leading.equalTo(nameLabel)
            make.trailing.equalTo(nameLabel)
        }
        moreButton.snp.makeConstraints { make in
            make.trailing.equalToSuperview().inset(AppSpacing.xs)
            make.centerY.equalTo(nameLabel.snp.bottom).offset(4)
            make.width.height.equalTo(32)
        }
        listConstraints.forEach { $0.deactivate() }
    }

    private func configureThumbnail(_ file: CloudFile) {
        if file.isFolder {
            thumbnailView.image = nil
            thumbnailView.backgroundColor = AppColor.warningBackground
            folderIconView.isHidden = false
            extensionLabel.isHidden = true
            return
        }
        folderIconView.isHidden = true
        thumbnailView.backgroundColor = AppColor.inputBackground
        let preview = file.isVideo ? file.coverUrl : file.fileUrl
        if let url = URL(string: preview), !preview.isEmpty {
            let placeholder = CloudDriveAsset.image(
                named: file.isVideo ? "icon_cloud_storage_file_type_video" : "icon_cloud_storage_file_type_photo",
                fallbackSystemName: file.isVideo ? "video" : "photo"
            )
            thumbnailView.kf.setImage(with: url, placeholder: placeholder)
        } else {
            thumbnailView.image = CloudDriveAsset.image(
                named: file.isVideo ? "icon_cloud_storage_file_type_video" : "icon_cloud_storage_file_type_photo",
                fallbackSystemName: file.isVideo ? "video" : "photo"
            )
            thumbnailView.tintColor = AppColor.textTertiary
        }
        playIconView.isHidden = !file.isVideo
        extensionLabel.text = CloudDriveFormatter.fileExtension(file.fileUrl.isEmpty ? file.name : file.fileUrl)
        extensionLabel.isHidden = false
    }

    @objc private func moreTapped() {
        onDetails?()
    }
}

/// 带内边距的标签。
private final class CloudDrivePaddingLabel: UILabel {
    var insets = UIEdgeInsets(top: 3, left: 5, bottom: 3, right: 5)

    override var intrinsicContentSize: CGSize {
        let size = super.intrinsicContentSize
        return CGSize(width: size.width + insets.left + insets.right, height: size.height + insets.top + insets.bottom)
    }

    override func drawText(in rect: CGRect) {
        super.drawText(in: rect.inset(by: insets))
    }
}