import LChatCore
import SwiftUI

// 🤖 The iOS receiver's confirm card (web→app handoff — the Mac
// AddFromLinkSheet's sibling): an invite link that arrived from OUTSIDE the
// app (the join page's "Open in the app" scheme, or a universal link on an
// instance subdomain) pre-fills this sheet — it never auto-joins; the Add
// tap is the confirming act for any URL that came from elsewhere.
// Deliberately NO editable field: iOS has no paste-a-link (Paul's call —
// joining lives on the web), so only an externally-arrived, already-validated
// link can reach this card. SpaceClaim handles all three link shapes
// (member/setup invites, DM invites, add-device links) with no webview; the
// secret in the #fragment never reaches any server.
struct AddFromLinkConfirm: View {
    @EnvironmentObject var app: AppState
    @Environment(\.dismiss) private var dismiss
    let link: String
    /// Called after the claim persisted (app.add ran) — RootView selects the
    /// new space and drops the pending link.
    let onAdded: (SavedInstance) -> Void
    @State private var busy = false
    @State private var error: String?

    private var host: String {
        parseJoinLink(link).flatMap { URL(string: $0.origin)?.host } ?? ""
    }

    var body: some View {
        VStack(spacing: 14) {
            Image(systemName: "person.crop.circle.badge.plus")
                .font(.system(size: 44))
                .foregroundStyle(.tint)
                .accessibilityHidden(true)
            Text("Add this space?")
                .font(.title3.bold())
            Text("You opened an invite for \(host). It joins this \(DeviceName.current) and syncs to your Eleven account.")
                .font(.callout)
                .foregroundStyle(.secondary)
                .multilineTextAlignment(.center)
            if let error {
                Text(error)
                    .font(.footnote)
                    .foregroundStyle(.red)
                    .multilineTextAlignment(.center)
            }
            Button(action: add) {
                HStack(spacing: 6) {
                    if busy { ProgressView().controlSize(.small) }
                    Text(busy ? "Joining…" : "Add Space")
                }
                .frame(maxWidth: .infinity)
            }
            .buttonStyle(.borderedProminent)
            .controlSize(.large)
            .disabled(busy)
            Button("Cancel") { dismiss() }
                .disabled(busy)
        }
        .padding(24)
        .presentationDetents([.medium])
    }

    private func add() {
        guard !busy else { return }
        busy = true
        error = nil
        Task { @MainActor in
            do {
                // Carry the name you already go by; an add-device link's own
                // "~name" (or "Me") wins inside the claim when this is empty.
                let screenName = app.instances.first(where: { !$0.isArchived })?.screenName
                    ?? app.instances.first?.screenName ?? ""
                let inst = try await SpaceClaim.claim(setupLink: link, screenName: screenName)
                app.add(inst) // Keychain + list + vault push
                onAdded(inst) // RootView: select + dismiss the pending link
            } catch {
                self.error = (error as? LocalizedError)?.errorDescription
                    ?? "Couldn't add that space."
                busy = false
            }
        }
    }
}