//  PreferencesView.swift
//  Tusker
//
//  Created by Shadowfacts on 6/13/19.
//  Copyright © 2019 Shadowfacts. All rights reserved.
//

import SwiftUI

struct PreferencesView: View {
    let mastodonController: MastodonController
    
    @ObservedObject private var localData = LocalData.shared
    @State private var showingLogoutConfirmation = false
    
    init(mastodonController: MastodonController) {
        self.mastodonController = mastodonController
    }

    var body: some View {
        List {
            accountsSection
            preferencesSection
            aboutSection
        }
        .listStyle(.insetGrouped)
        .appGroupedScrollBackgroundIfAvailable()
        .navigationBarTitle("Preferences")
        .navigationBarTitleDisplayMode(.inline)
        .onAppear {
            if #unavailable(iOS 16.0) {
                UITableView.appearance(whenContainedInInstancesOf: [PreferencesNavigationController.self]).backgroundColor = .appGroupedBackground
            }
        }
    }
    
    private var accountsSection: some View {
        Section {
            ForEach(localData.accounts, id: \.accessToken) { (account) in
                Button(action: {
                    NotificationCenter.default.post(name: .activateAccount, object: nil, userInfo: ["account": account])
                }) {
                    HStack {
                        LocalAccountAvatarView(localAccountInfo: account)
                        VStack(alignment: .leading) {
                            Text(verbatim: account.username)
                                .foregroundColor(.primary)
                            Text(verbatim: account.instanceURL.host!)
                                .font(.caption)
                                .foregroundColor(.primary)
                        }
                        Spacer()
                        if account == mastodonController.accountInfo! {
                            Image(systemName: "checkmark")
                                .renderingMode(.template)
                                .foregroundColor(.secondary)
                        }
                    }
                }.onDrag {
                    let activity = UserActivityManager.mainSceneActivity(accountID: account.id)
                    return NSItemProvider(object: activity)
                }
            }.onDelete { (indices: IndexSet) in
                var indices = indices
                var logoutFromCurrent = false
                if let index = indices.first(where: { localData.accounts[$0] == mastodonController.accountInfo! }) {
                    logoutFromCurrent = true
                    indices.remove(index)
                }
                
                indices.forEach { LogoutService(accountInfo: localData.accounts[$0]).run() }
                
                if logoutFromCurrent {
                    self.logoutPressed()
                }
            }
            
            Button(action: {
                NotificationCenter.default.post(name: .addAccount, object: nil)
            }) {
                Text("Add Account...")
            }
            Button(action: {
                self.showingLogoutConfirmation = true
            }) {
                Text("Logout from current")
            }.alert(isPresented: $showingLogoutConfirmation) {
                Alert(title: Text("Are you sure you want to logout?"), message: nil, primaryButton: .destructive(Text("Logout"), action: self.logoutPressed), secondaryButton: .cancel())
            }
        } header: {
            Text("Accounts")
        }
        .listRowBackground(Color.appGroupedCellBackground)
    }
    
    private var preferencesSection: some View {
        Section {
            NavigationLink(destination: AppearancePrefsView()) {
                Text("Appearance")
            }
            NavigationLink(destination: ComposingPrefsView()) {
                Text("Composing")
            }
            NavigationLink(destination: MediaPrefsView()) {
                Text("Media")
            }
            NavigationLink(destination: BehaviorPrefsView()) {
                Text("Behavior")
            }
            NavigationLink(destination: WellnessPrefsView()) {
                Text("Digital Wellness")
            }
            NavigationLink(destination: AdvancedPrefsView()) {
                Text("Advanced")
            }
        }
        .listRowBackground(Color.appGroupedCellBackground)
    }
    
    private var aboutSection: some View {
        Section {
            NavigationLink("About") {
                AboutView()
            }
            NavigationLink("Tip Jar") {
                TipJarView()
            }
            NavigationLink("Acknowledgements") {
                AcknowledgementsView()
            }
        }
        .listRowBackground(Color.appGroupedCellBackground)
    }
    
    func logoutPressed() {
        NotificationCenter.default.post(name: .userLoggedOut, object: nil)
    }
}

extension View {
    @available(iOS, obsoleted: 16.0)
    @ViewBuilder
    func appGroupedScrollBackgroundIfAvailable() -> some View {
        if #available(iOS 16.0, *) {
            self
                .scrollContentBackground(.hidden)
                .background(Color.appGroupedBackground)
        } else {
            self
        }
    }
}

//#if DEBUG
//struct PreferencesView_Previews : PreviewProvider {
//    static var previews: some View {
//        return PreferencesView()
//    }
//}
//#endif