import SwiftUI

struct RootView: View {
    @EnvironmentObject private var app: AppModel

    var body: some View {
        ZStack {
            McColors.bg.ignoresSafeArea()
            switch app.phase {
            case .boot:
                SplashView()
            case .server:
                ServerChoiceScreen()
            case .auth:
                AuthChoiceScreen()
            case .password:
                PasswordLoginScreen()
            case .link:
                LinkScreen()
            case .profiles:
                ProfilesScreen()
            case .main:
                MainShell()
            }
        }
        .animation(.easeInOut(duration: 0.28), value: app.phase)
        .sheet(item: approveSheetBinding) { item in
            DeviceApproveSheet(code: item.code)
                .environmentObject(app)
                .presentationDetents([.medium, .large])
        }
    }

    private var approveSheetBinding: Binding<ApproveCodeItem?> {
        Binding(
            get: {
                guard let code = app.pendingApproveCode, app.phase == .main else { return nil }
                return ApproveCodeItem(code: code)
            },
            set: { newValue in
                if newValue == nil { app.clearPendingApprove() }
            }
        )
    }
}

private struct ApproveCodeItem: Identifiable {
    let code: String
    var id: String { code }
}

struct SplashView: View {
    @State private var pulse = false

    var body: some View {
        VStack(spacing: 18) {
            Text("VMC")
                .font(McFonts.brand)
                .foregroundStyle(McColors.accent)
                .scaleEffect(pulse ? 1.04 : 0.96)
                .shadow(color: McColors.accent.opacity(0.45), radius: pulse ? 24 : 8)
            ProgressView()
                .tint(McColors.textDim)
        }
        .onAppear {
            withAnimation(.easeInOut(duration: 1.1).repeatForever(autoreverses: true)) {
                pulse = true
            }
        }
    }
}