import SwiftUI

/// The buttons under the transport on Now Playing that the user can hide.
enum NowPlayingButton: String, CaseIterable, Identifiable {
    case Mixer, Speed, Route, AirPlay, Karaoke
    var id: String { rawValue }
    var label: String {
        switch self {
        case .Mixer: "Stem Mixer"
        case .Speed: "Speed"
        case .Route: "Output & EQ"
        case .AirPlay: "AirPlay"
        case .Karaoke: "Karaoke"
        }
    }
    var icon: String {
        switch self {
        case .Mixer: "slider.vertical.3"
        case .Speed: "speedometer"
        case .Route: "hifispeaker"
        case .AirPlay: "airplayaudio"
        case .Karaoke: "music.mic"
        }
    }
    static func hidden(_ s: String) -> Set<NowPlayingButton> { Set(s.split(separator: ",").compactMap { Self(rawValue: String($0)) }) }
}

struct NowPlayingOptionsScreen: View {
    private var g: AppGraph { .shared }
    @Environment(\.palette) private var p

    var body: some View {
        @Bindable var s = g.settings
        List {
            Section {
                ForEach(NowPlayingButton.allCases) { b in
                    Toggle(isOn: Binding(
                        get: { !NowPlayingButton.hidden(s.hiddenNowPlaying).contains(b) },
                        set: { on in
                            var h = NowPlayingButton.hidden(s.hiddenNowPlaying)
                            if on { h.remove(b) } else { h.insert(b) }
                            s.hiddenNowPlaying = h.map(\.rawValue).sorted().joined(separator: ",")
                        })) {
                        HStack(spacing: 14) {
                            SettingsIcon(symbol: b.icon, bg: 0x5AC8FA)
                            Text(b.label).foregroundStyle(p.label)
                        }
                    }
                    .tint(Color(hex: 0x34C759))
                    .themedRow()
                }
            } footer: { Text("Choose which buttons show under the playback controls.").foregroundStyle(p.label2) }
            Section {
                Toggle(isOn: $s.lockScreenMix) {
                    HStack(spacing: 14) {
                        SettingsIcon(symbol: "lock.fill", bg: 0xFF9500)
                        Text("Back Button Changes Mix").foregroundStyle(p.label)
                    }
                }
                .tint(Color(hex: 0x34C759))
                .themedRow()
            } header: { Text("Lock Screen").foregroundStyle(p.label2) } footer: {
                Text("While stems play, the back button on the lock screen, Control Center and headphones moves to the next mix instead of the previous song, like the Mix button in CarPlay. The mix name shows after the artist.").foregroundStyle(p.label2)
            }
        }
        .listStyle(.insetGrouped)
        .themedList()
        .navigationTitle("Now Playing")
    }
}

struct StepperCell: View {
    let title: String
    @Binding var value: Int
    let icon: String
    let iconBg: UInt32
    @Environment(\.palette) private var p
    var body: some View {
        Stepper(value: $value, in: 0...50) {
            HStack(spacing: 14) {
                SettingsIcon(symbol: icon, bg: iconBg)
                Text(title).foregroundStyle(p.label)
                Spacer(minLength: 8)
                Text(value == 0 ? "Off" : "\(value) songs").foregroundStyle(p.label2)
            }
        }
        .themedRow()
    }
}