1 files changed, 166 insertions, 0 deletions
diff --git a/Hutch/Views/Tickets/TrackerListViewModel.swift b/Hutch/Views/Tickets/TrackerListViewModel.swift
new file mode 100644
index 0000000..9704071
--- /dev/null
+++ b/Hutch/Views/Tickets/TrackerListViewModel.swift
@@ -0,0 +1,166 @@
+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?
+}
+
+// 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?
+
+    private var cursor: String?
+    private var hasMore = true
+    private let client: SRHTClient
+
+    init(client: SRHTClient) {
+        self.client = client
+    }
+
+    // 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 }
+        }
+    }
+    """
+
+    // 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.localizedDescription
+        }
+
+        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.localizedDescription
+        }
+
+        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 = "Couldn’t create the tracker. \(error.localizedDescription)"
+            return nil
+        }
+    }
+
+    // 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
+    }
+}