using System;
using System.Collections.Generic;
using System.Configuration;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Collections.ObjectModel;
using brecal.model;
using brecal.mysql;
using System.Security.Cryptography;
using System.Security.Policy;
using System.Windows.Markup;

namespace RoleEditor
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        #region private fields

        private readonly ObservableCollection<Participant> _participants = new ObservableCollection<Participant>();
        private readonly ObservableCollection<Role> _roles = new ObservableCollection<Role>();
        private readonly ObservableCollection<Securable> _securables = new ObservableCollection<Securable>();
        private readonly ObservableCollection<User> _users = new ObservableCollection<User>();
        private readonly ObservableCollection<Role> _assignedRoles = new ObservableCollection<Role>();
        private readonly ObservableCollection<Securable> _assignedSecurables = new ObservableCollection<Securable>();
        private DBManager _dbManager;

        #endregion

        #region Construction / Loading

        public MainWindow()
        {
            InitializeComponent();
            _dbManager = new();
        }

        private async void Window_Loaded(object sender, RoutedEventArgs e)
        {
            // try database connection
            try
            {                               
                // load all participants
                foreach(Participant p in await Participant.LoadAll(_dbManager))
                    _participants.Add(p);
                this.listBoxParticipant.ItemsSource = _participants;

                // load all roles
                foreach(Role r in await Role.LoadAll(_dbManager))
                    _roles.Add(r);
                this.listBoxRoles.ItemsSource = _roles;

                // set other item sources
                this.listBoxUser.ItemsSource = _users;
                this.listBoxSecurables.ItemsSource = _securables;
                this.listBoxRoleSecurables.ItemsSource = _assignedSecurables;
                this.listBoxUserRoles.ItemsSource = _assignedRoles;
            }
            catch (Exception ex)
            {
                MessageBox.Show($"Database connection couldn't be established: {ex.Message}");
                this.Close();
            }
        }

        #endregion

        #region button callbacks

        private void buttonParticipantSave_Click(object sender, RoutedEventArgs e)
        {

        }

        private void buttonUserSave_Click(object sender, RoutedEventArgs e)
        {
            User? u = this.listBoxUser.SelectedItem as User;
            if(u != null)
            {
                u.Firstname = this.textBoxUserFirstName.Text.Trim();
                u.Lastname = this.textBoxUserLastName.Text.Trim();
                u.Username = this.textBoxUserUserName.Text.Trim();
                if(this.textBoxUserPassword.Text.Trim().Length > 0 )
                {
                    var data = Encoding.UTF8.GetBytes(this.textBoxUserPassword.Text.Trim());
                    using SHA512 sha = SHA512.Create();                    
                    byte[] hashedInputBytes = sha.ComputeHash(data);
                    var hashedInputStringBuilder = new StringBuilder(128);
                    foreach (var b in hashedInputBytes)
                        hashedInputStringBuilder.Append(b.ToString("X2"));
                    u.PasswordHash = hashedInputStringBuilder.ToString();
                }
                u.APIKey = this.textBoxUserAPIKey.Text.Trim();
                u.Save(_dbManager);
                this.listBoxUser.ItemsSource = null;
                this.listBoxUser.ItemsSource = _users;
            }
        }

        private void buttonAddRole_Click(object sender, RoutedEventArgs e)
        {

        }

        private void buttonRemoveRole_Click(object sender, RoutedEventArgs e)
        {

        }

        private void buttonAddSecurable_Click(object sender, RoutedEventArgs e)
        {

        }

        private void buttonRemoveSecurable_Click(object sender, RoutedEventArgs e)
        {

        }

        private void buttonSaveSecurable_Click(object sender, RoutedEventArgs e)
        {

        }

        private void buttonSaveRole_Click(object sender, RoutedEventArgs e)
        {

        }

        #endregion

        #region listbox selection callbacks

        private async void listBoxParticipant_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            Participant? p = this.listBoxParticipant.SelectedItem as Participant;
            
            this.textBoxParticipantName.Text = (p != null) ? p.Name : string.Empty;
            this.textBoxParticipantStreet.Text = (p != null) ? p.Street : string.Empty;
            this.textBoxParticipantPostalCode.Text = (p != null) ? p.PostalCode : string.Empty;
            this.textBoxParticipantCity.Text = (p != null) ? p.City : string.Empty;
            //  this.checkboxParticipantActive.Checked = (p != null) ? p.
            this.textBoxParticipantCreated.Text = (p != null) ? p.Created.ToString() : string.Empty;
            this.textBoxParticipantModified.Text = (p != null) ? p.Modified.ToString() : string.Empty;

            // -> load users for this participant selection
            this._users.Clear();            
            foreach (User u in await User.LoadForParticipant(p, _dbManager))
                _users.Add(u);
        }

        private void listBoxRoles_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {

        }

        private void listBoxUser_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            User? u = this.listBoxUser.SelectedItem as User;
            this.textBoxUserFirstName.Text = (u != null) ? u.Firstname : string.Empty;
            this.textBoxUserLastName.Text = (u != null) ? u.Lastname : string.Empty;
            this.textBoxUserUserName.Text = (u != null) ? u.Username : string.Empty;
            this.textBoxUserAPIKey.Text = (u != null) ? u.APIKey : string.Empty;
            this.textBoxUserCreated.Text = (u != null) ? u.Created.ToString() : string.Empty;
            this.textBoxUserModified.Text = (u != null) ? u.Modified.ToString() : string.Empty;
            this.textBoxUserPassword.Text = string.Empty;
        }

        private void listBoxSecurables_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {

        }

        #endregion

        #region menuitem callbacks

        private void menuItemDeleteParticipant_Click(object sender, RoutedEventArgs e)
        {

        }

        private void menuItemNewParticipant_Click(object sender, RoutedEventArgs e)
        {

        }

        private void menuItemNewUser_Click(object sender, RoutedEventArgs e)
        {
            Participant? p = this.listBoxParticipant.SelectedItem as Participant;
            if(p != null)
            {
                User u = new();
                u.Participant_Id = p.Id;
                _users.Add(u);
                this.listBoxUser.SelectedItem = u;
            }
        }

        private void menuItemDeleteUser_Click(object sender, RoutedEventArgs e)
        {

        }

        private void menuItemNewRole_Click(object sender, RoutedEventArgs e)
        {

        }

        private void menuItemDeleteRole_Click(object sender, RoutedEventArgs e)
        {

        }

        private void menuItemNewSecurable_Click(object sender, RoutedEventArgs e)
        {

        }

        private void menuItemDeleteSecurable_Click(object sender, RoutedEventArgs e)
        {

        }

        #endregion
        
    }
}