1 files changed, 114 insertions, 0 deletions
diff --git a/Hutch/Views/Pastes/PasteDetailViewModel.swift b/Hutch/Views/Pastes/PasteDetailViewModel.swift
new file mode 100644
index 0000000..8c60edd
--- /dev/null
+++ b/Hutch/Views/Pastes/PasteDetailViewModel.swift
@@ -0,0 +1,114 @@
+import Foundation
+
+@Observable
+@MainActor
+final class PasteDetailViewModel {
+    private(set) var paste: Paste?
+    private(set) var isLoading = false
+    private(set) var isUpdatingVisibility = false
+    private(set) var isDeleting = false
+    private(set) var loadingFileHashes: Set<String> = []
+    var error: String?
+
+    var selectedFileHash: String?
+    private(set) var fileContents: [String: String] = [:]
+
+    private let pasteID: String
+    private let service: PasteService
+
+    init(pasteID: String, initialPaste: Paste? = nil, service: PasteService) {
+        self.pasteID = pasteID
+        self.paste = initialPaste
+        self.service = service
+        self.selectedFileHash = initialPaste?.files.first?.hash
+    }
+
+    var selectedFile: PasteFile? {
+        let hash = selectedFileHash ?? paste?.files.first?.hash
+        return paste?.files.first(where: { $0.hash == hash })
+    }
+
+    var selectedFileContents: String? {
+        guard let selectedFile else { return nil }
+        return fileContents[selectedFile.hash]
+    }
+
+    func loadPaste() async {
+        guard !isLoading else { return }
+        isLoading = true
+        error = nil
+        defer { isLoading = false }
+
+        do {
+            let loaded = try await service.loadPaste(id: pasteID)
+            paste = loaded
+            if selectedFileHash == nil {
+                selectedFileHash = loaded?.files.first?.hash
+            }
+            await loadSelectedFileContentsIfNeeded()
+        } catch {
+            self.error = error.localizedDescription
+        }
+    }
+
+    func selectFile(hash: String) {
+        selectedFileHash = hash
+        Task {
+            await loadSelectedFileContentsIfNeeded()
+        }
+    }
+
+    func updateVisibility(_ visibility: Visibility) async -> Paste? {
+        guard !isUpdatingVisibility else { return nil }
+        guard let paste else { return nil }
+        guard paste.visibility != visibility else { return paste }
+
+        isUpdatingVisibility = true
+        error = nil
+        defer { isUpdatingVisibility = false }
+
+        do {
+            let updatedPaste = try await service.updateVisibility(id: paste.id, visibility: visibility)
+            if let updatedPaste {
+                self.paste = updatedPaste
+                if selectedFileHash == nil {
+                    selectedFileHash = updatedPaste.files.first?.hash
+                }
+            }
+            return updatedPaste
+        } catch {
+            self.error = error.localizedDescription
+            return nil
+        }
+    }
+
+    func deletePaste() async -> Bool {
+        guard !isDeleting else { return false }
+        isDeleting = true
+        error = nil
+        defer { isDeleting = false }
+
+        do {
+            _ = try await service.deletePaste(id: pasteID)
+            return true
+        } catch {
+            self.error = error.localizedDescription
+            return false
+        }
+    }
+
+    func loadSelectedFileContentsIfNeeded() async {
+        guard let file = selectedFile, fileContents[file.hash] == nil else { return }
+        guard let url = file.contents else { return }
+        guard !loadingFileHashes.contains(file.hash) else { return }
+
+        loadingFileHashes.insert(file.hash)
+        defer { loadingFileHashes.remove(file.hash) }
+
+        do {
+            fileContents[file.hash] = try await service.loadContents(from: url)
+        } catch {
+            self.error = error.localizedDescription
+        }
+    }
+}