//
//  TokenLoginView.swift
//  Nextcloud Cookbook iOS Client
//
//  Created by Vincent Meilinger on 21.11.23.
//

import Foundation
import OSLog
import SwiftUI



struct TokenLoginView: View {
    @Binding var showAlert: Bool
    @Binding var alertMessage: String
    @FocusState private var focusedField: Field?

    @State var userSettings = UserSettings.shared

    // TextField handling
    enum Field {
        case server
        case username
        case token
    }

    var body: some View {
        VStack(alignment: .leading, spacing: 16) {
            ServerAddressField()

            VStack(alignment: .leading, spacing: 6) {
                LoginLabel(text: "User name")
                BorderedLoginTextField(example: "username", text: $userSettings.username)
                    .focused($focusedField, equals: .username)
                    .textContentType(.username)
                    .submitLabel(.next)
            }

            VStack(alignment: .leading, spacing: 6) {
                LoginLabel(text: "App Token")
                BorderedLoginTextField(example: "can be generated in security settings of your nextcloud", text: $userSettings.token)
                    .focused($focusedField, equals: .token)
                    .textContentType(.password)
                    .submitLabel(.join)
            }

            Button {
                Task {
                    if await loginCheck(nextcloudLogin: false) {
                        userSettings.onboarding = false
                    }
                }
            } label: {
                Label("Submit", systemImage: "person.badge.key")
                    .font(.subheadline)
                    .fontWeight(.medium)
                    .frame(maxWidth: .infinity)
                    .padding(.vertical, 10)
                    .foregroundStyle(Color.nextcloudBlue)
                    .background(
                        RoundedRectangle(cornerRadius: 10)
                            .fill(Color.nextcloudBlue.opacity(0.1))
                    )
            }
            .padding(.top, 4)
        }
        .onSubmit {
            switch focusedField {
            case .server:
                focusedField = .username
            case .username:
                focusedField = .token
            default:
                Logger.view.debug("Attempting to log in ...")
            }
        }
    }

    func loginCheck(nextcloudLogin: Bool) async -> Bool {
        if userSettings.serverAddress == "" {
            alertMessage = String(localized: "Please enter a server address!")
            showAlert = true
            return false
        } else if !nextcloudLogin && (userSettings.username == "" || userSettings.token == "") {
            alertMessage = String(localized: "Please enter a user name and app token!")
            showAlert = true
            return false
        }

        UserSettings.shared.setAuthString()
        let client = CookbookApiFactory.makeClient()
        do {
            let _ = try await client.getCategories()
            return true
        } catch {
            alertMessage = String(localized: "Login failed. Please check your inputs and internet connection.")
            showAlert = true
            return false
        }
    }
}