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| 1 | +import Combine |
| 2 | +import Foundation |
| 3 | + |
| 4 | +public enum RuntimeStatus: Equatable, Sendable { |
| 5 | + case checking |
| 6 | + case online |
| 7 | + case offline |
| 8 | +} |
| 9 | + |
| 10 | +/// Subscribes to runtime app SSE and maps event payloads to render state. |
| 11 | +/// Contains no local transition logic beyond applying runtime-owned fields. |
| 12 | +@MainActor |
| 13 | +public final class AppStateViewModel: ObservableObject { |
| 14 | + @Published public private(set) var currentState: String = "idle" |
| 15 | + @Published public private(set) var output: TraverseStarterOutput? |
| 16 | + @Published public private(set) var errorMessage: String? |
| 17 | + @Published public private(set) var connected: Bool = false |
| 18 | + @Published public private(set) var sessionId: String? |
| 19 | + @Published public private(set) var executionId: String? |
| 20 | + @Published public private(set) var trace: [TraceEvent] = [] |
| 21 | + @Published public private(set) var runtimeStatus: RuntimeStatus = .checking |
| 22 | + @Published public private(set) var submitting: Bool = false |
| 23 | + @Published public var note: String = "" |
| 24 | + @Published public var showTrace: Bool = false |
| 25 | + |
| 26 | + public let appId: String |
| 27 | + public let noteMaxLength: Int |
| 28 | + |
| 29 | + private let client: TraverseClientProtocol |
| 30 | + private var baseURL: URL? |
| 31 | + private var workspaceId: String |
| 32 | + private var sseTask: Task<Void, Never>? |
| 33 | + private var healthTask: Task<Void, Never>? |
| 34 | + |
| 35 | + public init( |
| 36 | + client: TraverseClientProtocol, |
| 37 | + baseURL: URL?, |
| 38 | + workspaceId: String, |
| 39 | + appId: String = "traverse-starter", |
| 40 | + noteMaxLength: Int = 2000 |
| 41 | + ) { |
| 42 | + self.client = client |
| 43 | + self.baseURL = baseURL |
| 44 | + self.workspaceId = workspaceId |
| 45 | + self.appId = appId |
| 46 | + self.noteMaxLength = noteMaxLength |
| 47 | + startHealthChecks() |
| 48 | + startSSE() |
| 49 | + } |
| 50 | + |
| 51 | + deinit { |
| 52 | + sseTask?.cancel() |
| 53 | + healthTask?.cancel() |
| 54 | + } |
| 55 | + |
| 56 | + public var canSubmit: Bool { |
| 57 | + runtimeStatus == .online && |
| 58 | + !note.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty && |
| 59 | + !isRunning |
| 60 | + } |
| 61 | + |
| 62 | + public var isRunning: Bool { |
| 63 | + submitting || currentState == "processing" |
| 64 | + } |
| 65 | + |
| 66 | + public func updateConnection(baseURL: URL?, workspaceId: String) { |
| 67 | + let changed = self.baseURL != baseURL || self.workspaceId != workspaceId |
| 68 | + self.baseURL = baseURL |
| 69 | + self.workspaceId = workspaceId |
| 70 | + if changed { |
| 71 | + startSSE() |
| 72 | + Task { await refreshHealth() } |
| 73 | + } |
| 74 | + } |
| 75 | + |
| 76 | + public func startHealthChecks() { |
| 77 | + healthTask?.cancel() |
| 78 | + healthTask = Task { [weak self] in |
| 79 | + while !Task.isCancelled { |
| 80 | + await self?.refreshHealth() |
| 81 | + try? await Task.sleep(nanoseconds: 5_000_000_000) |
| 82 | + } |
| 83 | + } |
| 84 | + } |
| 85 | + |
| 86 | + public func refreshHealth() async { |
| 87 | + guard let baseURL else { |
| 88 | + runtimeStatus = .offline |
| 89 | + return |
| 90 | + } |
| 91 | + do { |
| 92 | + let ok = try await client.checkHealth(baseURL: baseURL) |
| 93 | + runtimeStatus = ok ? .online : .offline |
| 94 | + } catch { |
| 95 | + runtimeStatus = .offline |
| 96 | + } |
| 97 | + } |
| 98 | + |
| 99 | + public func submit() { |
| 100 | + guard canSubmit, let baseURL else { return } |
| 101 | + let trimmed = String(note.trimmingCharacters(in: .whitespacesAndNewlines).prefix(noteMaxLength)) |
| 102 | + submitting = true |
| 103 | + errorMessage = nil |
| 104 | + trace = [] |
| 105 | + Task { [weak self] in |
| 106 | + guard let self else { return } |
| 107 | + do { |
| 108 | + // New session each submit (omit session_id) so submit is valid from idle. |
| 109 | + _ = try await client.sendCommand( |
| 110 | + workspaceId: workspaceId, |
| 111 | + appId: appId, |
| 112 | + command: .submit(note: trimmed), |
| 113 | + baseURL: baseURL |
| 114 | + ) |
| 115 | + } catch { |
| 116 | + await MainActor.run { |
| 117 | + self.errorMessage = String(describing: error) |
| 118 | + self.submitting = false |
| 119 | + } |
| 120 | + return |
| 121 | + } |
| 122 | + await MainActor.run { self.submitting = false } |
| 123 | + } |
| 124 | + } |
| 125 | + |
| 126 | + public func resetLocal() { |
| 127 | + currentState = "idle" |
| 128 | + output = nil |
| 129 | + errorMessage = nil |
| 130 | + executionId = nil |
| 131 | + sessionId = nil |
| 132 | + trace = [] |
| 133 | + showTrace = false |
| 134 | + submitting = false |
| 135 | + } |
| 136 | + |
| 137 | + private func startSSE() { |
| 138 | + sseTask?.cancel() |
| 139 | + connected = false |
| 140 | + guard let baseURL else { return } |
| 141 | + let workspaceId = self.workspaceId |
| 142 | + let appId = self.appId |
| 143 | + sseTask = Task { [weak self] in |
| 144 | + guard let self else { return } |
| 145 | + while !Task.isCancelled { |
| 146 | + do { |
| 147 | + try await client.subscribeAppEvents( |
| 148 | + workspaceId: workspaceId, |
| 149 | + appId: appId, |
| 150 | + baseURL: baseURL |
| 151 | + ) { [weak self] type, payload in |
| 152 | + Task { @MainActor in |
| 153 | + self?.apply(eventType: type, payload: payload) |
| 154 | + } |
| 155 | + } |
| 156 | + } catch { |
| 157 | + await MainActor.run { self.connected = false } |
| 158 | + } |
| 159 | + try? await Task.sleep(nanoseconds: 2_000_000_000) |
| 160 | + } |
| 161 | + } |
| 162 | + } |
| 163 | + |
| 164 | + func apply(eventType: String, payload: AppStateEventPayload) { |
| 165 | + if eventType == "heartbeat" { |
| 166 | + connected = true |
| 167 | + return |
| 168 | + } |
| 169 | + connected = true |
| 170 | + if let state = payload.state, !state.isEmpty { |
| 171 | + currentState = state |
| 172 | + } |
| 173 | + if let sessionId = payload.sessionId { |
| 174 | + self.sessionId = sessionId |
| 175 | + } |
| 176 | + if let executionId = payload.executionId { |
| 177 | + self.executionId = executionId |
| 178 | + } |
| 179 | + if let output = payload.output { |
| 180 | + self.output = output |
| 181 | + } |
| 182 | + if let errorMessage = payload.errorMessage { |
| 183 | + self.errorMessage = errorMessage |
| 184 | + } else if payload.state == "results" { |
| 185 | + self.errorMessage = nil |
| 186 | + } |
| 187 | + if currentState == "results", let executionId, let baseURL { |
| 188 | + Task { [weak self] in |
| 189 | + guard let self else { return } |
| 190 | + let events = (try? await client.fetchTrace( |
| 191 | + workspaceId: workspaceId, |
| 192 | + executionId: executionId, |
| 193 | + baseURL: baseURL |
| 194 | + )) ?? [] |
| 195 | + await MainActor.run { self.trace = events } |
| 196 | + } |
| 197 | + } |
| 198 | + } |
| 199 | +} |
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