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import Foundation
@Observable
@MainActor
final class PasteListViewModel {
private(set) var pastes: [Paste] = []
private(set) var isLoading = false
private(set) var isLoadingMore = false
private(set) var isRefreshing = false
private(set) var isCreatingPaste = false
var error: String?
private var cursor: String?
private var hasMore = true
private let service: PasteService
init(service: PasteService) {
self.service = service
}
func loadPastes() async {
if pastes.isEmpty, let cached = service.loadCachedPastes() {
pastes = cached.results
cursor = cached.cursor
hasMore = cached.cursor != nil
}
if pastes.isEmpty {
isLoading = true
} else {
isRefreshing = true
}
error = nil
cursor = nil
hasMore = true
do {
let page = try await service.listPastes(cursor: nil, useCache: true)
pastes = page.results
cursor = page.cursor
hasMore = page.cursor != nil
} catch {
if pastes.isEmpty {
self.error = error.localizedDescription
}
}
isLoading = false
isRefreshing = false
}
func loadMoreIfNeeded(currentItem: Paste) async {
guard let last = pastes.last,
last.id == currentItem.id,
hasMore,
!isLoadingMore else {
return
}
isLoadingMore = true
defer { isLoadingMore = false }
do {
let page = try await service.listPastes(cursor: cursor, useCache: false)
pastes.append(contentsOf: page.results)
cursor = page.cursor
hasMore = page.cursor != nil
} catch {
self.error = error.localizedDescription
}
}
func createPaste(files: [PasteUploadDraft], visibility: Visibility) async -> Paste? {
guard !isCreatingPaste else { return nil }
let normalizedFiles = files.filter {
!$0.contents.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
}
guard !normalizedFiles.isEmpty else {
error = "Add at least one file with text content."
return nil
}
isCreatingPaste = true
error = nil
defer { isCreatingPaste = false }
do {
let paste = try await service.createPaste(files: normalizedFiles, visibility: visibility)
upsertPaste(paste)
return paste
} catch {
self.error = error.localizedDescription
return nil
}
}
func upsertPaste(_ paste: Paste) {
if let index = pastes.firstIndex(where: { $0.id == paste.id }) {
pastes[index] = paste
} else {
pastes.insert(paste, at: 0)
}
}
func removePaste(id: String) {
pastes.removeAll { $0.id == id }
}
}
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