import AppKit
import LChatCore
import SwiftUI

// 🤖 Settings → Advanced → "Performance": the Mac face of the shared perf
// instrumentation (LChatCore Perf.swift) — the same consent toggle as the
// iOS sheet, plus Reveal-in-Finder for the assembled report (the Mac idiom;
// iOS shares a file instead).
struct PerfSettingsSection: View {
    @AppStorage(Perf.consentKey) private var perfDiagnostics = Perf.defaultEnabled
    @State private var summary: String?

    var body: some View {
        Section {
            Toggle("Record performance diagnostics", isOn: $perfDiagnostics)
                .onChange(of: perfDiagnostics) { _, next in Perf.setRecording(next) }
            if perfDiagnostics {
                HStack {
                    Text(summary.map { "Recorded so far: \($0)." } ?? "Nothing recorded yet.")
                        .font(.footnote)
                        .foregroundStyle(.secondary)
                    Spacer()
                    Button("Show Report in Finder") { revealReport() }
                }
            }
            Text("A private log of how long things take — starting the app, opening chats, moments it freezes. It never includes what's in your messages, and it never leaves this Mac unless you share the report yourself.")
                .font(.footnote)
                .foregroundStyle(.secondary)
        } header: {
            Text("Performance")
        }
        .task(id: perfDiagnostics) {
            guard perfDiagnostics else { return }
            let events = await Task.detached { Perf.recordedEvents() }.value
            summary = PerfEvent.summary(events)
        }
    }

    private func revealReport() {
        Task {
            let url = await Task.detached { Perf.assembleExport() }.value
            guard let url else { return }
            NSWorkspace.shared.activateFileViewerSelecting([url])
        }
    }
}