import SwiftUI

struct ContentView: View {
    var ble: BLEManager

    var body: some View {
        TabView {
            Tab("EIS", systemImage: "waveform.path") {
                PlaceholderTab(title: "Impedance Spectroscopy", ble: ble)
            }
            Tab("LSV", systemImage: "arrow.right") {
                PlaceholderTab(title: "Linear Sweep Voltammetry", ble: ble)
            }
            Tab("Amp", systemImage: "bolt") {
                PlaceholderTab(title: "Amperometry", ble: ble)
            }
            Tab("Cl\u{2082}", systemImage: "drop") {
                PlaceholderTab(title: "Chlorine", ble: ble)
            }
            Tab("pH", systemImage: "scalemass") {
                PlaceholderTab(title: "pH", ble: ble)
            }
        }
    }
}

private struct PlaceholderTab: View {
    let title: String
    var ble: BLEManager

    var body: some View {
        NavigationStack {
            VStack(spacing: 20) {
                Image(systemName: "antenna.radiowaves.left.and.right")
                    .font(.largeTitle)
                    .foregroundStyle(statusColor)
                Text(ble.state.rawValue)
                    .font(.headline)
            }
            .navigationTitle(title)
            .toolbar {
                ToolbarItem(placement: .topBarTrailing) {
                    Button(ble.state == .connected ? "Disconnect" : "Connect") {
                        if ble.state == .connected {
                            ble.disconnect()
                        } else {
                            ble.startScanning()
                        }
                    }
                }
            }
        }
    }

    private var statusColor: Color {
        switch ble.state {
        case .connected:    .green
        case .scanning:     .orange
        case .connecting:   .yellow
        case .disconnected: .secondary
        }
    }
}