space-ios/iOSClient/Main/Collection Common/NCCollectionViewCommon+MediaLayout.swift

//
//  NCCollectionViewCommon+MediaLayout.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 13/07/24.
//  Copyright © 2024 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 Foundation
import UIKit
import NextcloudKit

extension NCCollectionViewCommon: NCMediaLayoutDelegate {
    func getColumnCount() -> Int {
        if self.numberOfColumns == 0,
           let layoutForView = database.getLayoutForView(account: session.account, key: NCGlobal.shared.layoutViewFiles, serverUrl: self.serverUrl) {
            if layoutForView.columnPhoto > 0 {
                self.numberOfColumns = layoutForView.columnPhoto
            } else {
                self.numberOfColumns = 3
            }
        }
        return self.numberOfColumns
    }

    func getLayout() -> String? {
        return self.layoutType
    }

    func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, heightForHeaderInSection section: Int) -> Float {
        return Float(sizeForHeaderInSection(section: section).height)
    }

    func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, heightForFooterInSection section: Int) -> Float {
        return Float(sizeForFooterInSection(section: section).height)
    }

    func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, insetForSection section: Int) -> UIEdgeInsets {
        return .zero
    }

    func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, insetForHeaderInSection section: Int) -> UIEdgeInsets {
        return .zero
    }

    func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, insetForFooterInSection section: Int) -> UIEdgeInsets {
        return .zero
    }

    func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, minimumInteritemSpacingForSection section: Int) -> Float {
        return 1.0
    }

    func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: IndexPath, columnCount: Int, typeLayout: String) -> CGSize {
        if typeLayout == NCGlobal.shared.layoutPhotoSquare {
            return CGSize(width: collectionView.frame.width / CGFloat(columnCount), height: collectionView.frame.width / CGFloat(columnCount))
        } else {
            guard let metadata = dataSource.getMetadata(indexPath: indexPath) else { return .zero }

            if metadata.imageSize != CGSize.zero {
                return metadata.imageSize
            } else if metadata.classFile == NKCommon.TypeClassFile.document.rawValue {
                let ext = NCGlobal.shared.getSizeExtension(column: self.numberOfColumns)
                if let image = self.utility.getImage(ocId: metadata.ocId, etag: metadata.etag, ext: ext) {
                    return image.size
                }
            }

            return CGSize(width: collectionView.frame.width / CGFloat(columnCount), height: collectionView.frame.width / CGFloat(columnCount))
        }
    }
}