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

import SwiftUI
import UserAccounts

struct PreferencesView: View {
    let mastodonController: MastodonController
    @ObservedObject var navigationState: PreferencesNavigationState
    
    @ObservedObject private var userAccounts = UserAccountsManager.shared
    @State private var showingLogoutConfirmation = false
    
    init(mastodonController: MastodonController, navigationState: PreferencesNavigationState) {
        self.mastodonController = mastodonController
        self.navigationState = navigationState
    }

    var body: some View {
        List {
            accountsSection
            preferencesSection
            aboutSection
        }
        .listStyle(.insetGrouped)
        .appGroupedListBackground(container: PreferencesNavigationController.self)
        .navigationBarTitle("Preferences")
        .navigationBarTitleDisplayMode(.inline)
    }
    
    private var accountsSection: some View {
        Section {
            ForEach(userAccounts.accounts) { (account) in
                Button(action: {
                    NotificationCenter.default.post(name: .activateAccount, object: nil, userInfo: ["account": account])
                }) {
                    HStack {
                        PrefsAccountView(account: account)
                        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: { userAccounts.accounts[$0] == mastodonController.accountInfo! }) {
                    logoutFromCurrent = true
                    indices.remove(index)
                }
                
                indices.forEach { LogoutService(accountInfo: userAccounts.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())
            }
            
            Button {
                NotificationCenter.default.post(name: .showMastodonSettings, object: nil)
            } label: {
                Text("Account Settings")
            }
        } header: {
            Text("Accounts")
        }
        .appGroupedListRowBackground()
    }
    
    private var preferencesSection: some View {
        Section {
            NavigationLink(destination: AppearancePrefsView()) {
                PreferenceSectionLabel(title: "Appearance", systemImageName: "textformat", backgroundColor: .indigo)
            }
            NavigationLink(destination: BehaviorPrefsView()) {
                PreferenceSectionLabel(title: "Behavior", systemImageName: "flowchart.fill", backgroundColor: .green)
            }
            NavigationLink(isActive: $navigationState.showNotificationPreferences) {
                NotificationsPrefsView()
            } label: {
                PreferenceSectionLabel(title: "Notifications", systemImageName: "bell.fill", backgroundColor: .red)
            }
            NavigationLink(destination: ComposingPrefsView()) {
                PreferenceSectionLabel(title: "Composing", systemImageName: "pencil", backgroundColor: .blue)
            }
            NavigationLink(destination: WellnessPrefsView()) {
                PreferenceSectionLabel(title: "Digital Wellness", systemImageName: "brain.fill", backgroundColor: .purple)
            }
            NavigationLink(destination: AdvancedPrefsView()) {
                PreferenceSectionLabel(title: "Advanced", systemImageName: "gearshape.2.fill", backgroundColor: .gray)
            }
        }
        .appGroupedListRowBackground()
    }
    
    private var aboutSection: some View {
        Section {
            NavigationLink {
                AboutView()
            } label: {
                Label {
                    Text("About")
                } icon: {
                    Image("AboutIcon")
                        .resizable()
                        .clipShape(RoundedRectangle(cornerRadius: 6))
                        .frame(width: 30, height: 30)
                }
            }
            NavigationLink {
                TipJarView()
            } label: {
                // TODO: custom tip jar icon?
                PreferenceSectionLabel(title: "Tip Jar", systemImageName: "dollarsign.square.fill", backgroundColor: .yellow)
            }
            NavigationLink {
                AcknowledgementsView()
            } label: {
                PreferenceSectionLabel(title: "Acknowledgements", systemImageName: "doc.text.fill", backgroundColor: .gray)
            }
        }
        .appGroupedListRowBackground()
    }
    
    func logoutPressed() {
        NotificationCenter.default.post(name: .userLoggedOut, object: nil)
    }
}

private struct PreferenceSectionLabel: View {
    let title: LocalizedStringKey
    let systemImageName: String
    let backgroundColor: Color
    
    var body: some View {
        Label {
            Text(title)
        } icon: {
            Image(systemName: systemImageName)
                .imageScale(.medium)
                .foregroundStyle(.white)
                .frame(width: 30, height: 30)
                .background(backgroundColor, in: RoundedRectangle(cornerRadius: 6))
        }
    }
}

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