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// |
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// ChargedDeviceSessionsView.swift |
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// USB Meter |
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// |
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// Created by Codex on 22/04/2026. |
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// |
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import SwiftUI |
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struct ChargedDeviceSessionsView: View {
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@EnvironmentObject private var appData: AppData |
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@State private var pendingSessionDeletion: ChargeSessionSummary? |
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let chargedDeviceID: UUID |
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private var chargedDevice: ChargedDeviceSummary? {
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appData.chargedDeviceSummary(id: chargedDeviceID) |
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} |
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private var sessions: [ChargeSessionSummary] {
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chargedDevice?.sessions.filter { !$0.status.isOpen } ?? []
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} |
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var body: some View {
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Group {
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if let chargedDevice {
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ScrollView {
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VStack(spacing: 14) {
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if sessions.isEmpty {
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emptyState |
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} else {
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summaryHeader(chargedDevice) |
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ForEach(sessions, id: \.id) { session in
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sessionCard(session, chargedDevice: chargedDevice) |
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} |
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} |
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} |
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.padding() |
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} |
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.background( |
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LinearGradient( |
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colors: [tint(for: chargedDevice).opacity(0.14), Color.clear], |
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startPoint: .topLeading, |
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endPoint: .bottomTrailing |
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) |
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.ignoresSafeArea() |
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) |
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.navigationTitle("Sessions")
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} else {
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Text("This device is no longer available.")
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.foregroundColor(.secondary) |
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.navigationTitle("Sessions")
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} |
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} |
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.alert(item: $pendingSessionDeletion) { session in
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Alert( |
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title: Text("Delete Session?"),
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message: Text("Deleting this charging session also recalculates capacity and every derived metric that used it."),
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primaryButton: .destructive(Text("Delete")) {
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_ = appData.deleteChargeSession(sessionID: session.id) |
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}, |
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secondaryButton: .cancel() |
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) |
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} |
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} |
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private var emptyState: some View {
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VStack(spacing: 10) {
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Image(systemName: "clock") |
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.font(.system(size: 34, weight: .semibold)) |
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.foregroundColor(.secondary) |
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Text("No Closed Sessions")
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.font(.headline) |
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Text("Completed and abandoned sessions will appear here after they are closed.")
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.font(.footnote) |
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.foregroundColor(.secondary) |
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.multilineTextAlignment(.center) |
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} |
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.frame(maxWidth: .infinity) |
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.padding(24) |
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.meterCard(tint: .secondary, fillOpacity: 0.10, strokeOpacity: 0.14, cornerRadius: 18) |
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} |
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private func summaryHeader(_ chargedDevice: ChargedDeviceSummary) -> some View {
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let totalEnergyWh = sessions.reduce(0) { $0 + $1.effectiveOrMeasuredEnergyWh }
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let completedCount = sessions.filter { $0.status == .completed }.count
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return MeterInfoCardView(title: chargedDevice.name, tint: tint(for: chargedDevice)) {
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MeterInfoRowView(label: "Closed Sessions", value: "\(sessions.count)") |
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MeterInfoRowView(label: "Completed", value: "\(completedCount)") |
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MeterInfoRowView(label: "Total Energy", value: "\(totalEnergyWh.format(decimalDigits: 2)) Wh") |
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} |
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} |
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private func sessionCard(_ session: ChargeSessionSummary, chargedDevice: ChargedDeviceSummary) -> some View {
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VStack(alignment: .leading, spacing: 10) {
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NavigationLink( |
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destination: ChargedDeviceSessionDetailView( |
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chargedDeviceID: chargedDevice.id, |
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sessionID: session.id |
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) |
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) {
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VStack(alignment: .leading, spacing: 10) {
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HStack(alignment: .firstTextBaseline, spacing: 10) {
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Text(session.startedAt.format()) |
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.font(.subheadline.weight(.semibold)) |
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.foregroundColor(.primary) |
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Text(session.status.title) |
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.font(.caption2.weight(.semibold)) |
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.foregroundColor(statusTint(for: session)) |
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.padding(.horizontal, 8) |
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.padding(.vertical, 4) |
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.background( |
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Capsule() |
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.fill(statusTint(for: session).opacity(0.16)) |
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) |
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Spacer() |
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Image(systemName: "chevron.right") |
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.font(.caption.weight(.semibold)) |
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.foregroundColor(.secondary) |
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} |
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Text(sessionSummaryLine(session, chargedDevice: chargedDevice)) |
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.font(.caption) |
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.foregroundColor(.secondary) |
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LazyVGrid(columns: metricColumns, spacing: 8) {
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metricCell(label: "Energy", value: "\(session.effectiveOrMeasuredEnergyWh.format(decimalDigits: 2)) Wh", tint: .teal) |
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metricCell(label: "Duration", value: sessionDurationText(session), tint: .orange) |
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if let maximumObservedPowerWatts = session.maximumObservedPowerWatts {
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metricCell(label: "Max Power", value: "\(maximumObservedPowerWatts.format(decimalDigits: 2)) W", tint: .blue) |
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} |
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if let maximumObservedCurrentAmps = session.maximumObservedCurrentAmps {
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metricCell(label: "Max Current", value: "\(maximumObservedCurrentAmps.format(decimalDigits: 2)) A", tint: .indigo) |
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} |
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} |
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} |
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} |
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.buttonStyle(.plain) |
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Divider() |
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HStack {
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if !session.displayedAggregatedSamples.isEmpty {
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Label("\(session.displayedAggregatedSamples.count) curve points", systemImage: "chart.xyaxis.line")
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.font(.caption2) |
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.foregroundColor(.secondary) |
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} |
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Spacer() |
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Button(role: .destructive) {
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pendingSessionDeletion = session |
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} label: {
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Image(systemName: "trash") |
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.font(.caption.weight(.semibold)) |
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.foregroundColor(.red) |
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.frame(width: 30, height: 30) |
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.background( |
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Circle() |
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.fill(Color.red.opacity(0.10)) |
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) |
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} |
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.buttonStyle(.plain) |
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.help("Delete session")
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} |
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} |
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.padding(14) |
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.meterCard(tint: statusTint(for: session), fillOpacity: 0.10, strokeOpacity: 0.16, cornerRadius: 16) |
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} |
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private var metricColumns: [GridItem] {
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[ |
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GridItem(.flexible(minimum: 92), spacing: 8), |
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GridItem(.flexible(minimum: 92), spacing: 8) |
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] |
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} |
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private func metricCell(label: String, value: String, tint: Color) -> some View {
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VStack(alignment: .leading, spacing: 4) {
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Text(label) |
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.font(.caption2) |
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.foregroundColor(.secondary) |
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Text(value) |
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.font(.footnote.weight(.semibold)) |
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.foregroundColor(.primary) |
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.monospacedDigit() |
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.lineLimit(1) |
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.minimumScaleFactor(0.8) |
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} |
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.frame(maxWidth: .infinity, alignment: .leading) |
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.padding(10) |
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.meterCard(tint: tint, fillOpacity: 0.08, strokeOpacity: 0.12, cornerRadius: 12) |
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} |
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private func sessionSummaryLine( |
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_ session: ChargeSessionSummary, |
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chargedDevice: ChargedDeviceSummary |
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) -> String {
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var components: [String] = [] |
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if let batteryDeltaPercent = session.batteryDeltaPercent {
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components.append("\(batteryDeltaPercent.format(decimalDigits: 0))%")
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} |
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if let capacityEstimateWh = session.capacityEstimateWh {
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components.append("\(capacityEstimateWh.format(decimalDigits: 2)) Wh capacity")
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} |
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if chargedDevice.shouldShowChargingTransport(session.chargingTransportMode) {
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components.append(session.chargingTransportMode.title) |
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} |
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if chargedDevice.shouldShowChargingStateMode(session.chargingStateMode) {
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components.append(session.chargingStateMode.title) |
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} |
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if session.isTrimmed {
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components.append("Trimmed")
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} |
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components.append(session.sourceMode.title) |
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return components.joined(separator: " - ") |
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} |
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private func sessionDurationText(_ session: ChargeSessionSummary) -> String {
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let formatter = DateComponentsFormatter() |
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let effectiveDuration = max(session.effectiveDuration, 0) |
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formatter.allowedUnits = effectiveDuration >= 3600 ? [.hour, .minute] : [.minute, .second] |
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formatter.unitsStyle = .abbreviated |
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formatter.zeroFormattingBehavior = .dropAll |
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return formatter.string(from: effectiveDuration) ?? "0m" |
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} |
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private func statusTint(for session: ChargeSessionSummary) -> Color {
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switch session.status {
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case .active: |
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return .green |
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case .paused: |
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return .orange |
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case .completed: |
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return .teal |
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case .abandoned: |
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return .secondary |
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} |
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} |
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private func tint(for chargedDevice: ChargedDeviceSummary) -> Color {
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switch chargedDevice.deviceClass {
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case .iphone: |
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return .blue |
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case .watch: |
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return .green |
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case .powerbank: |
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return .orange |
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case .charger: |
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return .pink |
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case .other: |
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return .secondary |
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} |
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} |
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} |
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