import AppKit
import SwiftUI
import ShotdeckCore

// SwiftPM treats a file named main.swift as top-level code, which forbids `@main`.
// App.main() is the equivalent entry point.
if ProcessInfo.processInfo.environment["SHOTDECK_SNAPSHOT_DIR"] != nil {
    MainActor.assumeIsolated { PanelSnapshot.runIfRequested() }
}
if ProcessInfo.processInfo.environment["REDLINE_SELFTEST_PHASE"] == "onedrive" {
    MainActor.assumeIsolated { PickerSelfTest.runOneDriveOnlyIfRequested() }
}
if ProcessInfo.processInfo.environment["SHOTDECK_PICKER_SELFTEST"] != nil {
    MainActor.assumeIsolated { PickerSelfTest.runIfRequested() }
}
ShotdeckApp.main()

struct ShotdeckApp: App {
    @NSApplicationDelegateAdaptor(AppDelegate.self) private var appDelegate

    var body: some Scene {
        MenuBarExtra {
            MenuBarView()
                .environment(appDelegate.model)
        } label: {
            let state = appDelegate.model.iconState
            HStack(spacing: 4) {
                Image(systemName: state.symbolName)
                if let count = state.countText {
                    Text(count).font(.system(size: 11, weight: .semibold))
                }
            }
            .accessibilityLabel("Redline")
        }
        .menuBarExtraStyle(.window)
    }
}

@MainActor
final class AppDelegate: NSObject, NSApplicationDelegate {
    let model: AppModel

    override init() {
        NSApplication.shared.setActivationPolicy(.accessory)
        model = AppDelegate.makeLaunchModel()
        super.init()
    }

    func applicationDidFinishLaunching(_ notification: Notification) {
        Task { await model.bootstrap() }
    }

    /// Builds the model exactly the way the real app launches: paths come from
    /// `TransportSettings.resolvedAppSupportPaths()` — transport-aware, so the watcher
    /// this feeds is never seeded with a stale AirDrop folder while OneDrive is the
    /// persisted transport (that was the BLOCKER this function used to have, when it
    /// called the AirDrop-only `FolderSettings.resolvedAppSupportPaths()` instead).
    /// `appSupportRoot` exists only so PickerSelfTest's relaunch-simulation sub-step can
    /// point this at a temp directory instead of the real
    /// ~/Library/Application Support/Shotdeck — production always calls this with no
    /// argument (the real root). Internal, not private, for that same reason.
    static func makeLaunchModel(appSupportRoot: URL? = nil) -> AppModel {
        do {
            let paths = try TransportSettings.resolvedAppSupportPaths(root: appSupportRoot)
            return try makeModel(paths: paths)
        } catch {
            Log.ui.critical(
                "AppModel init failed: \(String(describing: error), privacy: .public)"
            )
            let tmp = FileManager.default.temporaryDirectory
            let fallbackRoot = tmp.appendingPathComponent("Shotdeck-fallback", isDirectory: true)
            // Safe: temp-dir creation for a path this process controls cannot legitimately fail.
            let fallback = try! AppSupportPaths(root: fallbackRoot, outbox: tmp, watchFolder: tmp)
            let model = try! makeModel(paths: fallback)
            model.setStatus("Redline could not access its storage folder. Captures will not persist.")
            return model
        }
    }

    private static func makeModel(paths: AppSupportPaths) throws -> AppModel {
        let ledger = try ReturnLedger(paths: paths)
        return AppModel(
            paths: paths,
            spool: try SpoolStore(paths: paths),
            composer: PDFComposer(),
            capturer: ScreenCapturer(),
            hotkeys: HotkeyCenter(),
            picker: RegionPickerController(),
            ledger: ledger,
            watcher: ReturnWatcher(paths: paths, ledger: ledger)
        )
    }
}