import AppKit
import SwiftUI

/// The welcome window (02-architecture.md § Windows).
///
/// ### What this is, and what it is not yet
///
/// The settled shape is Xcode's: "branding + actions left, recents right (board icon, name,
/// location, lane/card counts, sorted by last opened)". This is the left half, plus the one thing
/// that cannot wait — the list of boards that failed to open, because 02 § Launch and window
/// lifecycle forbids a launch-time failure from being silently dropped and welcome is where it must
/// surface.
///
/// The layout is therefore already an `HStack` with one column in it. The recents column drops in
/// beside it; nothing here has to move.
// m4-welcome: the recents column, New Board… / Open Recent, per-row Forget and Reveal in Finder, and
// the row-level failure rendering 02 specifies (a failed board's own row carrying fail-fast's
// specifics, or the unavailable state per Graceful orphaning) all land with the welcome milestone.
struct WelcomeView: View {

    @Environment(AppModel.self) private var appModel

    var body: some View {
        HStack(spacing: 0) {
            branding
                .frame(width: 300)
                .frame(maxHeight: .infinity)
                .padding(32)

            Divider()

            failures
                .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .topLeading)
                .padding(32)
        }
        // Fixed, with `.windowResizability(.contentSize)` on the scene: welcome is a launcher, not a
        // workspace, and Xcode's — the window this one is modelled on — does not resize either. The
        // one thing that can grow without bound is the failure list, which scrolls.
        .frame(width: 760, height: 460)
    }

    // MARK: Branding and actions

    private var branding: some View {
        VStack(alignment: .leading, spacing: 0) {
            Image(nsImage: NSApp.applicationIconImage)
                .resizable()
                .frame(width: 96, height: 96)
                .accessibilityHidden(true)

            Text("Lanework")
                .font(.system(size: 34, weight: .light))
                .padding(.top, 12)

            Text(versionSummary)
                .font(.callout)
                .foregroundStyle(.secondary)

            Spacer(minLength: 24)

            Button("Open Board…") {
                appModel.presentOpenPanel()
            }
            .controlSize(.large)
        }
        .frame(maxWidth: .infinity, alignment: .leading)
    }

    private var versionSummary: String {
        let info = Bundle.main.infoDictionary
        let short = info?["CFBundleShortVersionString"] as? String ?? "—"
        let build = info?["CFBundleVersion"] as? String ?? "—"
        return "Version \(short) (\(build))"
    }

    // MARK: Failed opens

    @ViewBuilder
    private var failures: some View {
        if appModel.launchFailures.isEmpty {
            VStack(alignment: .leading, spacing: 8) {
                Text("No boards open")
                    .font(.title3)
                Text("Open a board folder to get started.")
                    .foregroundStyle(.secondary)
            }
        } else {
            VStack(alignment: .leading, spacing: 12) {
                Text("Couldn't open")
                    .font(.title3)

                ScrollView {
                    VStack(alignment: .leading, spacing: 12) {
                        ForEach(appModel.launchFailures) { failure in
                            VStack(alignment: .leading, spacing: 2) {
                                Text(failure.displayName)
                                    .font(.headline)
                                Text(failure.message)
                                    .font(.callout)
                                    .foregroundStyle(.secondary)
                                    .fixedSize(horizontal: false, vertical: true)
                                Text(failure.path)
                                    .font(.caption)
                                    .foregroundStyle(.tertiary)
                                    .lineLimit(1)
                                    .truncationMode(.middle)
                            }
                            .frame(maxWidth: .infinity, alignment: .leading)
                        }
                    }
                }

                Button("Clear") {
                    appModel.clearLaunchFailures()
                }
            }
        }
    }
}

// MARK: - Settings

/// The app's preferences (⌘, — 11-command-nexus.md).
///
/// One control, which is the whole of v1: "Restore open boards at launch". The preference gates only
/// whether the registry's open-now flags are *consulted* at launch — the flags themselves are
/// maintained either way, which is what keeps crash recovery working for a user who has restoration
/// turned off and then turns it back on.
struct SettingsView: View {

    @AppStorage(AppPreferences.restoreOpenBoardsAtLaunchKey)
    private var restoreOpenBoardsAtLaunch = true

    var body: some View {
        Form {
            Toggle("Restore open boards at launch", isOn: $restoreOpenBoardsAtLaunch)
        }
        .formStyle(.grouped)
        .frame(width: 420)
        .fixedSize()
    }
}