//
//  SettingsTabView.swift
//  Nextcloud Cookbook iOS Client
//
//  Created by Vincent Meilinger on 29.05.25.
//

import Foundation
import SwiftUI


struct SettingsTabView: View {
    @ObservedObject var userSettings = UserSettings.shared
    
    @State private var avatarImage: UIImage?
    @State private var userData: UserData?
    
    @State private var showAlert: Bool = false
    @State private var alertType: SettingsAlert = .NONE
    
    @State private var presentLoginSheet: Bool = false
    
    enum SettingsAlert {
        case LOG_OUT,
             DELETE_CACHE,
             NONE
        
        func getTitle() -> String {
            switch self {
            case .LOG_OUT: return "Log out"
            case .DELETE_CACHE: return "Delete local data"
            default: return "Please confirm your action."
            }
        }
        
        func getMessage() -> String {
            switch self {
            case .LOG_OUT: return "Are you sure that you want to log out of your account?"
            case .DELETE_CACHE: return "Are you sure that you want to delete the downloaded recipes? This action will not affect any recipes stored on your server."
            default: return ""
            }
        }
    }
    
    var body: some View {
        Form {
            Section {
                if userSettings.authString.isEmpty {
                    HStack(alignment: .center) {
                        if let avatarImage = avatarImage {
                            Image(uiImage: avatarImage)
                                .resizable()
                                .clipShape(Circle())
                                .frame(width: 100, height: 100)
                                
                        }
                        if let userData = userData {
                            VStack(alignment: .leading) {
                                Text(userData.userDisplayName)
                                    .font(.title)
                                    .padding(.leading)
                                Text("Username: \(userData.userId)")
                                    .font(.subheadline)
                                    .padding(.leading)
                                
                                
                                // TODO: Add actions
                            }
                        }
                        Spacer()
                    }
                    
                    Button("Log out") {
                        print("Log out.")
                        alertType = .LOG_OUT
                        showAlert = true
                    }
                    .tint(.red)
                } else {
                    Button("Log in") {
                        print("Log in.")
                        presentLoginSheet.toggle()
                    }
                    
                }
                
            } header: {
                Text("Nextcloud")
            } footer: {
                Text("Log in to your Nextcloud account to sync your recipes. This requires a Nextcloud server with the Nextcloud Cookbook application installed.")
            }
            
            Section {
                Toggle(isOn: $userSettings.expandNutritionSection) {
                    Text("Expand nutrition section")
                }
                Toggle(isOn: $userSettings.expandKeywordSection) {
                    Text("Expand keyword section")
                }
                Toggle(isOn: $userSettings.expandInfoSection) {
                    Text("Expand information section")
                }
            } header: {
                Text("Recipes")
            } footer: {
                Text("Configure which sections in your recipes are expanded by default.")
            }
            
            Section {
                Toggle(isOn: $userSettings.keepScreenAwake) {
                    Text("Keep screen awake when viewing recipes")
                }
            }
            
            Section {
                HStack {
                    Text("Decimal number format")
                    Spacer()
                    Picker("", selection: $userSettings.decimalNumberSeparator) {
                        Text("Point (e.g. 1.42)").tag(".")
                        Text("Comma (e.g. 1,42)").tag(",")
                    }
                    .pickerStyle(.menu)
                }
            } footer: {
                Text("This setting will take effect after the app is restarted. It affects the adjustment of ingredient quantities.")
            }
            
            Section {
                Toggle(isOn: $userSettings.storeRecipes) {
                    Text("Offline recipes")
                }
                Toggle(isOn: $userSettings.storeImages) {
                    Text("Store recipe images locally")
                }
                Toggle(isOn: $userSettings.storeThumb) {
                    Text("Store recipe thumbnails locally")
                }
            } header: {
                Text("Downloads")
            } footer: {
                Text("Configure what is stored on your device.")
            }
            
            Section {
                Picker("Language", selection: $userSettings.language) {
                    ForEach(SupportedLanguage.allValues, id: \.self) { lang in
                        Text(lang.descriptor()).tag(lang.rawValue)
                    }
                }
            } footer: {
                Text("If \'Same as Device\' is selected and your device language is not supported yet, this option will default to english.")
            }
            
            
            Section {
                Link("Visit the GitHub page", destination: URL(string: "https://github.com/VincentMeilinger/Nextcloud-Cookbook-iOS")!)
            } header: {
                Text("About")
            } footer: {
                Text("If you are interested in contributing to this project or simply wish to review its source code, we encourage you to visit the GitHub repository for this application.")
            }
            
            Section {
                Link("Get support", destination: URL(string: "https://vincentmeilinger.github.io/Nextcloud-Cookbook-Client-Support/")!)
            } header: {
                Text("Support")
            } footer: {
                Text("If you have any inquiries, feedback, or require assistance, please refer to the support page for contact information.")
            }
            
            Section {
                Button("Delete local data") {
                    print("Clear cache.")
                    alertType = .DELETE_CACHE
                    showAlert = true
                }
                .tint(.red)
                
            } header: {
                Text("Other")
            } footer: {
                Text("Deleting local data will not affect the recipe data stored on your server.")
            }
            
            Section(header: Text("Acknowledgements")) {
                VStack(alignment: .leading) {
                    if let url = URL(string: "https://github.com/scinfu/SwiftSoup") {
                        Link("SwiftSoup", destination:  url)
                            .font(.headline)
                        Text("An HTML parsing and web scraping library for Swift. Used for importing schema.org recipes from websites.")
                    }
                }
                VStack(alignment: .leading) {
                    if let url = URL(string: "https://github.com/techprimate/TPPDF") {
                        Link("TPPDF", destination: url)
                            .font(.headline)
                        Text("A simple-to-use PDF builder for Swift. Used for generating recipe PDF documents.")
                    }
                }
            }
        }
        
        .navigationTitle("Settings")
        .alert(alertType.getTitle(), isPresented: $showAlert) {
            Button("Cancel", role: .cancel) { }
            if alertType == .DELETE_CACHE {
                Button("Delete", role: .destructive) { deleteCachedData() }
            }
        } message: {
            Text(alertType.getMessage())
        }
        .task {
            await getUserData()
        }
        .sheet(isPresented: $presentLoginSheet, onDismiss: {}) {
            V2LoginView()
        }
    }
    
    func getUserData() async {
        let (data, _) = await NextcloudApi.getAvatar()
        let (userData, _) = await NextcloudApi.getHoverCard()
        
        DispatchQueue.main.async {
            self.avatarImage = data
            self.userData = userData
        }
    }
    
    func deleteCachedData() {
        print("TODO: Delete cached data\n")
    }
}