Documents tab with file sharing

Model/DocumentsModel.swift

@@ -0,0 +1,185 @@
+import Foundation
+
+final class DocumentsModel: ObservableObject {
+    static var shared = DocumentsModel()
+
+    @Published private(set) var directoryURL: URL!
+    @Published private(set) var refreshID = UUID()
+
+    typealias AreInIncreasingOrder = (URL, URL) -> Bool
+
+    init(directoryURL: URL! = nil) {
+        self.directoryURL = directoryURL
+    }
+
+    private var fileManager: FileManager {
+        .default
+    }
+
+    var directoryLabel: String {
+        guard let directoryURL else { return "Documents" }
+        return displayLabelForDocument(directoryURL)
+    }
+
+    var sortPredicates: [AreInIncreasingOrder] {
+        [
+            { self.isDirectory($0) && !self.isDirectory($1) },
+            { $0.lastPathComponent.caseInsensitiveCompare($1.lastPathComponent) == .orderedAscending }
+        ]
+    }
+
+    var sortedDirectoryContents: [URL] {
+        directoryContents.sorted { lhs, rhs in
+            for predicate in sortPredicates {
+                if !predicate(lhs, rhs), !predicate(rhs, lhs) {
+                    continue
+                }
+
+                return predicate(lhs, rhs)
+            }
+
+            return false
+        }
+    }
+
+    var directoryContents: [URL] {
+        guard let directoryURL else { return [] }
+        return contents(of: directoryURL)
+    }
+
+    var documentsDirectory: URL? {
+        if let url = try? fileManager.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true) {
+            return replacePrivateVar(url)
+        }
+        return nil
+    }
+
+    func isDocument(_ video: Video) -> Bool {
+        guard video.isLocal, let url = video.localStream?.localURL, let url = replacePrivateVar(url) else { return false }
+        return isDocument(url)
+    }
+
+    func isDocument(_ url: URL) -> Bool {
+        guard let url = replacePrivateVar(url), let documentsDirectory else { return false }
+        return url.absoluteString.starts(with: documentsDirectory.absoluteString)
+    }
+
+    func isDirectory(_ url: URL) -> Bool {
+        (try? url.resourceValues(forKeys: [.isDirectoryKey]).isDirectory) ?? false
+    }
+
+    var creationDateFormatter: DateFormatter {
+        let formatter = DateFormatter()
+
+        formatter.dateStyle = .short
+        formatter.timeStyle = .short
+
+        return formatter
+    }
+
+    func creationDate(_ video: Video) -> Date? {
+        guard video.isLocal, let url = video.localStream?.localURL, let url = replacePrivateVar(url) else { return nil }
+        return creationDate(url)
+    }
+
+    func creationDate(_ url: URL) -> Date? {
+        try? url.resourceValues(forKeys: [.creationDateKey]).creationDate
+    }
+
+    func formattedCreationDate(_ video: Video) -> String? {
+        guard video.isLocal, let url = video.localStream?.localURL, let url = replacePrivateVar(url) else { return nil }
+        return formattedCreationDate(url)
+    }
+
+    func formattedCreationDate(_ url: URL) -> String? {
+        if let date = try? url.resourceValues(forKeys: [.creationDateKey]).creationDate {
+            return creationDateFormatter.string(from: date)
+        }
+
+        return nil
+    }
+
+    var sizeFormatter: ByteCountFormatter {
+        let formatter = ByteCountFormatter()
+
+        formatter.allowedUnits = .useAll
+        formatter.countStyle = .file
+        formatter.includesUnit = true
+        formatter.isAdaptive = true
+
+        return formatter
+    }
+
+    func size(_ video: Video) -> Int? {
+        guard video.isLocal, let url = video.localStream?.localURL, let url = replacePrivateVar(url) else { return nil }
+        return size(url)
+    }
+
+    func size(_ url: URL) -> Int? {
+        try? url.resourceValues(forKeys: [.fileAllocatedSizeKey]).fileAllocatedSize
+    }
+
+    func formattedSize(_ video: Video) -> String? {
+        guard let size = size(video) else { return nil }
+        return sizeFormatter.string(fromByteCount: Int64(size))
+    }
+
+    func formattedSize(_ url: URL) -> String? {
+        guard let size = size(url) else { return nil }
+        return sizeFormatter.string(fromByteCount: Int64(size))
+    }
+
+    func removeDocument(_ url: URL) throws {
+        guard isDocument(url) else { return }
+        try fileManager.removeItem(at: url)
+        URLBookmarkModel.shared.removeBookmark(url)
+        refresh()
+    }
+
+    private func contents(of directory: URL) -> [URL] {
+        (try? fileManager.contentsOfDirectory(
+            at: directory,
+            includingPropertiesForKeys: [.creationDateKey, .fileAllocatedSizeKey, .isDirectoryKey],
+            options: [.includesDirectoriesPostOrder, .skipsHiddenFiles]
+        )) ?? []
+    }
+
+    private func displayLabelForDocument(_ file: URL) -> String {
+        let components = file.absoluteString.components(separatedBy: "/Documents/")
+        if components.count == 2 {
+            let component = components[1]
+            return component.isEmpty ? "Documents" : component.removingPercentEncoding ?? component
+        }
+        return "Document"
+    }
+
+    var canGoBack: Bool {
+        guard let directoryURL, let documentsDirectory else { return false }
+        return replacePrivateVar(directoryURL) != documentsDirectory
+    }
+
+    func goToURL(_ url: URL) {
+        directoryURL = url
+    }
+
+    func goBack() {
+        directoryURL = urlToGoBack
+    }
+
+    func goToTop() {
+        directoryURL = documentsDirectory
+    }
+
+    private var urlToGoBack: URL? {
+        directoryURL?.deletingLastPathComponent()
+    }
+
+    func replacePrivateVar(_ url: URL) -> URL? {
+        let urlStringWithPrivateVarRemoved = url.absoluteString.replacingFirstOccurrence(of: "/private/var/", with: "/var/")
+        return URL(string: urlStringWithPrivateVarRemoved)
+    }
+
+    func refresh() {
+        refreshID = UUID()
+    }
+}