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import Foundation
// MARK: - Response types (file-private to avoid @MainActor Decodable issues)
private struct TrackersResponse: Decodable, Sendable {
let trackers: TrackersPage
}
private struct TrackersPage: Decodable, Sendable {
let results: [TrackerSummary]
let cursor: String?
}
private struct UpdateTrackerResponse: Decodable, Sendable {
let updateTracker: TrackerSummary
}
private struct DeleteTrackerResponse: Decodable, Sendable {
let deleteTracker: DeletedTracker
}
private struct DeletedTracker: Decodable, Sendable {
let id: Int
}
// MARK: - View Model
@Observable
@MainActor
final class TrackerListViewModel {
private(set) var trackers: [TrackerSummary] = []
private(set) var isLoading = false
private(set) var isLoadingMore = false
private(set) var isCreatingTracker = false
var error: String?
var searchText = ""
private var cursor: String?
private var hasMore = true
private let client: SRHTClient
init(client: SRHTClient) {
self.client = client
}
var filteredTrackers: [TrackerSummary] {
let q = searchText.trimmingCharacters(in: .whitespacesAndNewlines).lowercased()
guard !q.isEmpty else { return trackers }
return trackers.filter {
$0.name.lowercased().contains(q) ||
($0.description?.lowercased().contains(q) == true) ||
$0.owner.canonicalName.lowercased().contains(q)
}
}
// MARK: - Query
private static let query = """
query trackers($cursor: Cursor) {
trackers(cursor: $cursor) {
results {
id
rid
name
description
visibility
updated
owner { canonicalName }
}
cursor
}
}
"""
private static let createTrackerMutation = """
mutation createTracker($name: String!, $visibility: Visibility!, $description: String) {
createTracker(name: $name, visibility: $visibility, description: $description) {
id
rid
name
description
visibility
updated
owner { canonicalName }
}
}
"""
private static let updateTrackerMutation = """
mutation updateTracker($id: Int!, $input: TrackerInput!) {
updateTracker(id: $id, input: $input) {
id
rid
name
description
visibility
updated
owner { canonicalName }
}
}
"""
private static let deleteTrackerMutation = """
mutation deleteTracker($id: Int!) {
deleteTracker(id: $id) {
id
}
}
"""
// MARK: - Public API
func loadTrackers() async {
isLoading = true
error = nil
cursor = nil
hasMore = true
do {
let page = try await fetchPage(cursor: nil)
trackers = page.results
cursor = page.cursor
hasMore = page.cursor != nil
} catch {
self.error = error.userFacingMessage
}
isLoading = false
}
func loadMoreIfNeeded(currentItem: TrackerSummary) async {
guard let last = trackers.last,
last.id == currentItem.id,
hasMore,
!isLoadingMore else {
return
}
isLoadingMore = true
do {
let page = try await fetchPage(cursor: cursor)
trackers.append(contentsOf: page.results)
cursor = page.cursor
hasMore = page.cursor != nil
} catch {
self.error = error.userFacingMessage
}
isLoadingMore = false
}
func createTracker(name: String, description: String, visibility: Visibility) async -> TrackerSummary? {
guard !isCreatingTracker else { return nil }
let trimmedName = name.trimmingCharacters(in: .whitespacesAndNewlines)
guard !trimmedName.isEmpty else {
error = "Enter a tracker name."
return nil
}
isCreatingTracker = true
error = nil
defer { isCreatingTracker = false }
var variables: [String: any Sendable] = [
"name": trimmedName,
"visibility": visibility.rawValue
]
let trimmedDescription = description.trimmingCharacters(in: .whitespacesAndNewlines)
if !trimmedDescription.isEmpty {
variables["description"] = trimmedDescription
}
do {
let result = try await client.execute(
service: .todo,
query: Self.createTrackerMutation,
variables: variables,
responseType: CreateTrackerResponse.self
)
let tracker = result.createTracker
trackers.insert(tracker, at: 0)
return tracker
} catch {
self.error = trackerCreationErrorMessage(for: error)
return nil
}
}
func updateTracker(
_ tracker: TrackerSummary,
name: String,
description: String,
visibility: Visibility
) async -> TrackerSummary? {
guard !isCreatingTracker else { return nil }
let trimmedName = name.trimmingCharacters(in: .whitespacesAndNewlines)
guard !trimmedName.isEmpty else {
error = "Enter a tracker name."
return nil
}
isCreatingTracker = true
error = nil
defer { isCreatingTracker = false }
let trimmedDescription = description.trimmingCharacters(in: .whitespacesAndNewlines)
let input: [String: any Sendable] = [
"name": trimmedName,
"description": trimmedDescription.isEmpty ? "" : trimmedDescription,
"visibility": visibility.rawValue
]
do {
let result = try await client.execute(
service: .todo,
query: Self.updateTrackerMutation,
variables: [
"id": tracker.id,
"input": input
],
responseType: UpdateTrackerResponse.self
)
applyTrackerUpdate(result.updateTracker)
return result.updateTracker
} catch {
self.error = "Couldn’t update the tracker. \(error.userFacingMessage)"
return nil
}
}
func deleteTracker(_ tracker: TrackerSummary) async -> Bool {
guard !isCreatingTracker else { return false }
isCreatingTracker = true
error = nil
defer { isCreatingTracker = false }
do {
_ = try await client.execute(
service: .todo,
query: Self.deleteTrackerMutation,
variables: ["id": tracker.id],
responseType: DeleteTrackerResponse.self
)
trackers.removeAll { $0.id == tracker.id }
await loadTrackers()
return true
} catch {
self.error = "Couldn’t delete the tracker. \(error.userFacingMessage)"
return false
}
}
func applyTrackerUpdate(_ tracker: TrackerSummary) {
if let index = trackers.firstIndex(where: { $0.id == tracker.id }) {
trackers[index] = tracker
} else {
trackers.insert(tracker, at: 0)
}
}
func applyTrackerDeletion(_ tracker: TrackerSummary) {
trackers.removeAll { $0.id == tracker.id }
}
// MARK: - Private
private func fetchPage(cursor: String?) async throws -> TrackersPage {
var variables: [String: any Sendable] = [:]
if let cursor {
variables["cursor"] = cursor
}
let result = try await client.execute(
service: .todo,
query: Self.query,
variables: variables.isEmpty ? nil : variables,
responseType: TrackersResponse.self
)
return result.trackers
}
private struct CreateTrackerResponse: Decodable, Sendable {
let createTracker: TrackerSummary
}
private func trackerCreationErrorMessage(for error: Error) -> String {
"Couldn’t create the tracker. \(error.userFacingMessage)"
}
}
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