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|
import SwiftUI
@Observable
@MainActor
final class MailingListListViewModel {
private(set) var mailingLists: [InboxMailingListReference] = []
private(set) var isLoading = false
var error: String?
private let client: SRHTClient
private static let subscriptionsQuery = """
query mailingLists($cursor: Cursor) {
subscriptions(cursor: $cursor) {
results {
... on MailingListSubscription {
list {
id
rid
name
owner { canonicalName }
}
}
}
cursor
}
}
"""
init(client: SRHTClient) {
self.client = client
}
func loadMailingLists() async {
guard !isLoading else { return }
isLoading = true
error = nil
defer { isLoading = false }
do {
mailingLists = try await fetchMailingLists()
} catch {
self.error = "Failed to load mailing lists"
}
}
private func fetchMailingLists() async throws -> [InboxMailingListReference] {
struct Response: Decodable, Sendable {
let subscriptions: Page
}
struct Page: Decodable, Sendable {
let results: [Subscription]
let cursor: String?
}
struct Subscription: Decodable, Sendable {
let list: InboxMailingListReference?
}
var results: [InboxMailingListReference] = []
var cursor: String?
while true {
var variables: [String: any Sendable] = [:]
if let cursor {
variables["cursor"] = cursor
}
let response = try await client.execute(
service: .lists,
query: Self.subscriptionsQuery,
variables: variables.isEmpty ? nil : variables,
responseType: Response.self
)
results.append(contentsOf: response.subscriptions.results.compactMap(\.list))
guard let nextCursor = response.subscriptions.cursor else {
break
}
cursor = nextCursor
}
var seen = Set<String>()
return results
.filter { seen.insert($0.rid).inserted }
.sorted {
if $0.owner.canonicalName == $1.owner.canonicalName {
return $0.name.localizedCaseInsensitiveCompare($1.name) == .orderedAscending
}
return $0.owner.canonicalName.localizedCaseInsensitiveCompare($1.owner.canonicalName) == .orderedAscending
}
}
}
struct MailingListListView: View {
@Environment(AppState.self) private var appState
@State private var viewModel: MailingListListViewModel?
var body: some View {
Group {
if let viewModel {
content(viewModel)
} else {
SRHTLoadingStateView(message: "Loading mailing lists…")
}
}
.navigationTitle("Lists")
.task {
if viewModel == nil {
let vm = MailingListListViewModel(client: appState.client)
viewModel = vm
await vm.loadMailingLists()
}
}
}
@ViewBuilder
private func content(_ viewModel: MailingListListViewModel) -> some View {
@Bindable var vm = viewModel
List {
ForEach(viewModel.mailingLists, id: \.rid) { mailingList in
NavigationLink(value: MoreRoute.mailingList(mailingList)) {
VStack(alignment: .leading, spacing: 4) {
Text(mailingList.name)
.font(.subheadline.weight(.medium))
Text(mailingList.owner.canonicalName)
.font(.caption)
.foregroundStyle(.secondary)
}
.padding(.vertical, 2)
}
}
}
.listStyle(.plain)
.overlay {
if viewModel.isLoading, viewModel.mailingLists.isEmpty {
SRHTLoadingStateView(message: "Loading mailing lists…")
} else if let error = viewModel.error, viewModel.mailingLists.isEmpty {
SRHTErrorStateView(
title: "Couldn't Load Mailing Lists",
message: error,
retryAction: { await viewModel.loadMailingLists() }
)
} else if viewModel.mailingLists.isEmpty {
ContentUnavailableView(
"No Mailing Lists",
systemImage: "list.bullet.rectangle",
description: Text("Your subscribed mailing lists will appear here.")
)
}
}
.srhtErrorBanner(error: $vm.error)
.refreshable {
await viewModel.loadMailingLists()
}
}
}
|
