import SwiftUI

struct NetworkCarouselView: View {
    var networks: [NetworkCardModel]
    var selectedNetworkID: Int32?
    var onSelect: ((NetworkCardModel) -> Void)?

    init(
        networks: [NetworkCardModel],
        selectedNetworkID: Int32? = nil,
        onSelect: ((NetworkCardModel) -> Void)? = nil
    ) {
        self.networks = networks
        self.selectedNetworkID = selectedNetworkID
        self.onSelect = onSelect
    }

    var body: some View {
        Group {
            if networks.isEmpty {
                #if os(iOS)
                VStack(alignment: .leading, spacing: 6) {
                    Text("No stored networks yet")
                        .font(.headline)
                    Text("WireGuard and Tailnet networks show up here as soon as you add one.")
                        .font(.footnote)
                        .foregroundStyle(.secondary)
                }
                .frame(maxWidth: .infinity, alignment: .leading)
                .padding()
                .background(
                    RoundedRectangle(cornerRadius: 18)
                        .fill(.thinMaterial)
                )
                #else
                ContentUnavailableView(
                    "No Networks Yet",
                    systemImage: "network.slash",
                    description: Text("Add a WireGuard network, or save a Tailnet account so Burrow can store a managed network when the daemon is reachable.")
                )
                .frame(maxWidth: .infinity, minHeight: 175)
                #endif
            } else {
                #if os(macOS)
                LazyVStack(alignment: .leading, spacing: 12) {
                    ForEach(networks) { network in
                        networkCard(network)
                            .frame(maxWidth: 560)
                    }
                }
                .frame(maxWidth: .infinity, alignment: .leading)
                #else
                ScrollView(.horizontal) {
                    LazyHStack {
                        ForEach(networks) { network in
                            networkCard(network)
                                .containerRelativeFrame(.horizontal, count: 10, span: 7, spacing: 0, alignment: .center)
                                .scrollTransition(.interactive, axis: .horizontal) { content, phase in
                                    content
                                        .scaleEffect(1.0 - abs(phase.value) * 0.1)
                                }
                        }
                    }
                }
                .scrollTargetLayout()
                .scrollClipDisabled()
                .scrollIndicators(.hidden)
                .defaultScrollAnchor(.center)
                .scrollTargetBehavior(.viewAligned)
                .containerRelativeFrame(.horizontal)
                #endif
            }
        }
    }

    @ViewBuilder
    private func networkCard(_ network: NetworkCardModel) -> some View {
        if let onSelect {
            Button {
                onSelect(network)
            } label: {
                NetworkView(network: network)
                    .overlay(selectionOverlay(for: network))
            }
            .buttonStyle(.plain)
        } else {
            NetworkView(network: network)
        }
    }

    private func selectionOverlay(for network: NetworkCardModel) -> some View {
        RoundedRectangle(cornerRadius: 10)
            .stroke(
                selectedNetworkID == network.id ? Color.accentColor : Color.clear,
                lineWidth: 3
            )
    }
}

#if DEBUG
struct NetworkCarouselView_Previews: PreviewProvider {
    static var previews: some View {
        NetworkCarouselView(networks: [WireGuardCard(id: 1, detail: "10.13.13.2/24 · wg.burrow.rs:51820").card])
    }
}
#endif