//
//  NotificationsModeView.swift
//  SimpleX (iOS)
//
//  Created by Evgeny on 03/07/2022.
//  Copyright © 2022 SimpleX Chat. All rights reserved.
//
// Spec: spec/client/navigation.md

import SwiftUI
import SimpleXChat

struct SetNotificationsMode: View {
    @Environment(\.dismiss) var dismiss
    @Binding var notificationMode: NotificationsMode
    @State private var showInfo = false

    var body: some View {
        GeometryReader { g in
            ScrollView {
                VStack(alignment: .center, spacing: 20) {
                    Text("Push notifications")
                        .font(.largeTitle)
                        .bold()
                        .padding(.top, 25)

                    Button {
                        showInfo = true
                    } label: {
                        Label("How it affects privacy", systemImage: "info.circle")
                            .font(.headline)
                    }

                    Spacer()

                    ForEach(NotificationsMode.values) { mode in
                        NtfModeSelector(mode: mode, selection: $notificationMode)
                    }

                    Spacer()

                    VStack(spacing: 10) {
                        Button {
                            dismiss()
                        } label: {
                            Text("OK")
                        }
                        .buttonStyle(OnboardingButtonStyle())
                        onboardingButtonPlaceholder()
                    }
                }
                .padding(25)
                .frame(minHeight: g.size.height)
            }
        }
        .frame(maxHeight: .infinity)
        .sheet(isPresented: $showInfo) {
            NotificationsInfoView()
        }
    }
}

struct NtfModeSelector: View {
    @EnvironmentObject var theme: AppTheme
    var mode: NotificationsMode
    @Binding var selection: NotificationsMode
    @State private var tapped = false

    var body: some View {
        ZStack {
            HStack(spacing: 16) {
                Image(systemName: mode.icon)
                    .resizable()
                    .scaledToFill()
                    .frame(width: mode.icon == "bolt" ? 14 : 18, height: 18)
                    .foregroundColor(selection == mode ? theme.colors.primary : theme.colors.secondary)
                VStack(alignment: .leading, spacing: 4) {
                    Text(mode.label)
                        .font(.headline)
                        .foregroundColor(selection == mode ? theme.colors.primary : theme.colors.secondary)
                    Text(ntfModeShortDescription(mode))
                        .lineLimit(2)
                        .font(.callout)
                        .fixedSize(horizontal: false, vertical: true)
                }
            }
            .padding(.vertical, 12)
            .padding(.trailing, 12)
            .padding(.leading, 16)
        }
        .frame(maxWidth: .infinity, alignment: .leading)
        .background(tapped ? Color(uiColor: .secondarySystemFill) : theme.colors.background)
        .clipShape(RoundedRectangle(cornerRadius: 18))
        .overlay(
            RoundedRectangle(cornerRadius: 18)
                .stroke(selection == mode ? theme.colors.primary : Color(uiColor: .secondarySystemFill), lineWidth: 2)
        )
        ._onButtonGesture { down in
            tapped = down
            if down { selection = mode }
        } perform: {}
    }
}

struct NotificationsInfoView: View {
    var body: some View {
        VStack(alignment: .leading) {
            Text("Notifications privacy")
                .font(.largeTitle)
                .bold()
                .padding(.vertical)
            ScrollView {
                VStack(alignment: .leading) {
                    Group {
                        ForEach(NotificationsMode.values) { mode in
                            VStack(alignment: .leading, spacing: 4) {
                                (Text(Image(systemName: mode.icon)) + textSpace + Text(mode.label))
                                    .font(.headline)
                                    .foregroundColor(.secondary)
                                Text(ntfModeDescription(mode))
                                    .lineLimit(10)
                                    .font(.callout)
                            }
                        }
                    }
                    .padding(.bottom)
                }
            }
        }
        .padding()
        .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .top)
        .modifier(ThemedBackground())
    }
}

struct NotificationsModeView_Previews: PreviewProvider {
    static var previews: some View {
        SetNotificationsMode(notificationMode: .constant(.instant))
    }
}