using Microsoft.Data.Sqlite;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics.Metrics;
using System.Linq;
using System.Net;
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.Shapes;
using WGneu.Models;


namespace WGneu.Windows {
    public partial class MemberListWindow : Window {
        private bool IsEditing = false;
        private bool IsCreating = false;
        private List<string> TextFilter = new();
        private readonly Control[] ExemptInputs;
        private readonly Dictionary<Control, bool> Valid = new();
        private readonly Dictionary<Control, object?> OriginalValues = new();
        private readonly RoutedCommand CtrlF = new();
        private readonly WgContext Context = new();

        public MemberListWindow() {
            InitializeComponent();
            CtrlF.InputGestures.Add(new KeyGesture(Key.F, ModifierKeys.Control));
            CommandBindings.Add(new CommandBinding(CtrlF, FocusSearchInput));
            ExemptInputs = new Control[] {
                SearchInput, ActiveMemberInput, MemberList,
                NewMemberButton, EditMemberButton, DeleteMemberButton,
                ResetButton, SaveButton, CancelButton
            };
            foreach (var tb in Utils.FindVisualChilds<TextBox>(this, ExemptInputs))
                Valid[tb] = true;
        }

        private void Window_Loaded(object sender, RoutedEventArgs e) {
            ActiveMemberInput.IsChecked = true;
            BranchInput.ItemsSource = Context.Branches.OrderBy(b => b.Name).ToList();
            DefaultKgInput.ItemsSource = Context.WbKgs.Select(k => k.Kg).OrderBy(k => k.Name).ToList();
        }

        protected override void OnClosing(CancelEventArgs e) {
            Context.Dispose();
            base.OnClosing(e);
        }

        private int CountMatchesInMember(Member m) {
            if (TextFilter.Count == 0) return 0;
            string[] check = new string[] { m.MgNr.ToString(), m.FamilyName.ToLower(), m.GivenName.ToLower(), m.DefaultKg.Name.ToLower() };
            int i = 0;
            foreach (string c in check) {
                if (TextFilter.Any(f => c == f))
                    i += 10;
                else if (TextFilter.Any(f => c.Contains(f)))
                    i += 1;
            }
            return i;
        }

        private void RefreshMemberList() {
            Context.Members.Load();
            IQueryable<Member> memberQuery = Context.Members;
            if (ActiveMemberInput.IsChecked == true)
                memberQuery = memberQuery.Where(m => m.Active);

            List<Member> members = memberQuery.ToList();
            members = members.OrderBy(m => m.FamilyName + " " + m.GivenName).ToList();

            if (TextFilter.Count > 0) {
                members = members
                    .ToDictionary(m => m, m => CountMatchesInMember(m))
                    .OrderByDescending(a => a.Value)
                    .Where(a => a.Value > 0)
                    .Select(a => a.Key)
                    .ToList();
            }
            MemberList.ItemsSource = members;
            if (members.Count == 1)
                MemberList.SelectedIndex = 0;

            RefreshInputs();
        }

        private void ClearInputStates() {
            foreach (var tb in Utils.FindVisualChilds<TextBox>(this, ExemptInputs))
                Utils.ClearInputState(tb);
            foreach (var cb in Utils.FindVisualChilds<ComboBox>(this, ExemptInputs))
                Utils.ClearInputState(cb);
            foreach (var cb in Utils.FindVisualChilds<CheckBox>(this, ExemptInputs))
                Utils.ClearInputState(cb);
            foreach (var rb in Utils.FindVisualChilds<RadioButton>(this, ExemptInputs))
                Utils.ClearInputState(rb);
        }

        private void RefreshInputs() {
            Member m = (Member)MemberList.SelectedItem;
            if (m != null) {
                EditMemberButton.IsEnabled = true;
                DeleteMemberButton.IsEnabled = true;
                FillInputs(m);
            } else {
                EditMemberButton.IsEnabled = false;
                DeleteMemberButton.IsEnabled = false;
                ClearInputs();
            }
            ClearInputStates();
        }

        private void InitInputs() {
            ClearInputs();
            MgNrInput.Text = NextMgNr().ToString();
        }

        private void MemberList_SelectionChanged(object sender, SelectionChangedEventArgs e) {
            RefreshInputs();
        }

        private void ActiveMemberInput_Changed(object sender, RoutedEventArgs e) {
            RefreshMemberList();
        }

        private void NewMemberButton_Click(object sender, RoutedEventArgs e) {
            IsCreating = true;
            MemberList.IsEnabled = false;
            InitInputs();
            HideNewEditDeleteButtons();
            ShowSaveResetCancelButtons();
            UnlockInputs();
            LockSearchInputs();
        }

        private void EditMemberButton_Click(object sender, RoutedEventArgs e) {
            if (MemberList.SelectedItem == null)
                return;

            IsEditing = true;
            MemberList.IsEnabled = false;

            HideNewEditDeleteButtons();
            ShowSaveResetCancelButtons();
            UnlockInputs();
            LockSearchInputs();
        }

        private void DeleteMemberButton_Click(object sender, RoutedEventArgs e) {
            Member m = (Member)MemberList.SelectedItem;
            if (m == null) return;

            var r = MessageBox.Show(
                $"Soll das Mitglied \"{m.FamilyName} {m.GivenName}\" (MgNr. {m.MgNr}) wirklich unwiderruflich gelöscht werden?",
                "Mitglied löschen", MessageBoxButton.YesNo, MessageBoxImage.Warning, MessageBoxResult.No);
            if (r == MessageBoxResult.Yes) {
                Context.Remove(m);
                Context.SaveChanges();
                RefreshMemberList();
            }
        }

        private void SaveButton_Click(object sender, RoutedEventArgs e) {
            Member? m = new();
            if (IsEditing)
                m = (Member)MemberList.SelectedItem;
            else if (IsCreating)
                m = new();

            int newMgNr = int.Parse(MgNrInput.Text);
            m.Prefix = (PrefixInput.Text == "") ? null : PrefixInput.Text;
            m.GivenName = GivenNameInput.Text;
            m.FamilyName = FamilyNameInput.Text;
            m.Suffix = (SuffixInput.Text == "") ? null : SuffixInput.Text;
            m.Birthday = (BirthdayInput.Text == "") ? null : string.Join("-", BirthdayInput.Text.Split(".").Reverse());
            m.CountryCode = "AT";
            m.PostalDestId = ((AT_Plz)OrtInput.SelectedItem).Id;
            m.PostalDest = Context.PostalDestinations.Find(m.CountryCode, m.PostalDestId);
            m.Address = AddressInput.Text;

            m.Email = (EmailInput.Text == "") ? null : EmailInput.Text;
            m.PhoneLandline = (PhoneLandlineInput.Text == "") ? null : PhoneLandlineInput.Text.Replace(" ", "");
            m.PhoneMobile1 = (PhoneMobile1Input.Text == "") ? null : PhoneMobile1Input.Text.Replace(" ", "");
            m.PhoneMobile2 = (PhoneMobile2Input.Text == "") ? null : PhoneMobile2Input.Text.Replace(" ", "");

            m.Iban = (IbanInput.Text == "") ? null : IbanInput.Text.Replace(" ", "");
            m.Bic = (BicInput.Text == "") ? null : BicInput.Text;

            m.UstId = (UstIdInput.Text == "") ? null : UstIdInput.Text;
            m.LfbisNr = (LfbisNrInput.Text == "") ? null : LfbisNrInput.Text;
            m.Buchführend = BuchführendInput.IsChecked ?? false;

            // TODO Rechnungsadresse

            m.EntryDate = (EntryDateInput.Text == "") ? null : string.Join("-", EntryDateInput.Text.Split(".").Reverse());
            m.ExitDate = (ExitDateInput.Text == "") ? null : string.Join("-", ExitDateInput.Text.Split(".").Reverse());
            m.BusinessShares = (BusinessSharesInput.Text == "") ? 0 : int.Parse(BusinessSharesInput.Text);
            m.AccountingNr = (AccountingNrInput.Text == "") ? null : AccountingNrInput.Text;
            m.Active = ActiveInput.IsChecked ?? false;
            m.VollLieferant = VollLieferantInput.IsChecked ?? false;
            m.Funktionär = FunkionärInput.IsChecked ?? false;
            m.ZwstId = ((Branch)BranchInput.SelectedItem).ZwstId;
            m.DefaultKgNr = ((AT_Kg)DefaultKgInput.SelectedItem).KgNr;
            m.Comment = (CommentInput.Text == "") ? null : CommentInput.Text;
            if (ContactPostInput.IsChecked ?? false) m.DefaultContact = "post";
            if (ContactEmailInput.IsChecked ?? false) m.DefaultContact = "email";

            try {
                if (IsEditing)
                    Context.Update(m);
                else if (IsCreating)
                    Context.Add(m);
                Context.SaveChanges();

                if (newMgNr != m.MgNr)
                    Context.Database.ExecuteSql($"UPDATE member SET mgnr = {newMgNr} WHERE mgnr = {m.MgNr}");
            } catch (Exception exc) {
                var str = "Der Eintrag konnte nicht in der Datenbank aktualisiert werden!\n\n" + exc.Message;
                if (exc.InnerException != null) str += "\n\n" + exc.InnerException.Message;
                MessageBox.Show(str, "Mitglied aktualisieren", MessageBoxButton.OK, MessageBoxImage.Error);
            }

            IsEditing = false;
            IsCreating = false;
            MemberList.IsEnabled = true;
            HideSaveResetCancelButtons();
            ShowNewEditDeleteButtons();
            LockInputs();
            UnlockSearchInputs();
            RefreshMemberList();
        }

        private void ResetButton_Click(object sender, RoutedEventArgs e) {
            if (IsEditing) {
                RefreshInputs();
            } else if (IsCreating) {
                InitInputs();
            }
            UpdateButtons();
        }

        private void CancelButton_Click(object sender, RoutedEventArgs e) {
            IsEditing = false;
            IsCreating = false;
            MemberList.IsEnabled = true;
            HideSaveResetCancelButtons();
            ShowNewEditDeleteButtons();
            RefreshInputs();
            LockInputs();
            UnlockSearchInputs();
        }

        private void AreaCommitmentButton_Click(object sender, RoutedEventArgs e) {
            var w = new AreaCommitmentListWindow((Member) MemberList.SelectedItem);
            w.Show();
        }

        private void SearchInput_TextChanged(object sender, RoutedEventArgs e) {
            TextFilter = SearchInput.Text.ToLower().Split(" ").ToList().FindAll(s => s != "");
            RefreshMemberList();
        }

        private void FocusSearchInput(object sender, RoutedEventArgs e) {
            if (!IsEditing && !IsCreating) {
                SearchInput.Focus();
                SearchInput.SelectAll();
            }
        }

        private int NextMgNr() {
            int c = Context.Members.Select(m => m.MgNr).Min();
            Context.Members.OrderBy(m => m.MgNr).Select(m => m.MgNr).ToList().ForEach(a => { if (a <= c + 100) c = a; });
            return c + 1;
        }

        private void ShowSaveResetCancelButtons() {
            SaveButton.IsEnabled = false;
            ResetButton.IsEnabled = false;
            CancelButton.IsEnabled = true;
            SaveButton.Visibility = Visibility.Visible;
            ResetButton.Visibility = Visibility.Visible;
            CancelButton.Visibility = Visibility.Visible;
        }

        private void HideSaveResetCancelButtons() {
            SaveButton.IsEnabled = false;
            ResetButton.IsEnabled = false;
            CancelButton.IsEnabled = false;
            SaveButton.Visibility = Visibility.Hidden;
            ResetButton.Visibility = Visibility.Hidden;
            CancelButton.Visibility = Visibility.Hidden;
        }

        private void ShowNewEditDeleteButtons() {
            NewMemberButton.IsEnabled = true;
            EditMemberButton.IsEnabled = MemberList.SelectedItem != null;
            DeleteMemberButton.IsEnabled = MemberList.SelectedItem != null;
            NewMemberButton.Visibility = Visibility.Visible;
            EditMemberButton.Visibility = Visibility.Visible;
            DeleteMemberButton.Visibility = Visibility.Visible;
        }

        private void HideNewEditDeleteButtons() {
            NewMemberButton.IsEnabled = false;
            EditMemberButton.IsEnabled = false;
            DeleteMemberButton.IsEnabled = false;
            NewMemberButton.Visibility = Visibility.Hidden;
            EditMemberButton.Visibility = Visibility.Hidden;
            DeleteMemberButton.Visibility = Visibility.Hidden;
        }

        private void LockInputs() {
            foreach (var tb in Utils.FindVisualChilds<TextBox>(this, ExemptInputs))
                tb.IsReadOnly = true;
            foreach (var cb in Utils.FindVisualChilds<ComboBox>(this, ExemptInputs))
                cb.IsEnabled = false;
            foreach (var cb in Utils.FindVisualChilds<CheckBox>(this, ExemptInputs))
                cb.IsEnabled = false;
            foreach (var rb in Utils.FindVisualChilds<RadioButton>(this, ExemptInputs))
                rb.IsEnabled = false;
        }

        private void UnlockInputs() {
            foreach (var tb in Utils.FindVisualChilds<TextBox>(this, ExemptInputs))
                tb.IsReadOnly = false;
            foreach (var cb in Utils.FindVisualChilds<ComboBox>(this, ExemptInputs))
                cb.IsEnabled = true;
            foreach (var cb in Utils.FindVisualChilds<CheckBox>(this, ExemptInputs))
                cb.IsEnabled = true;
            foreach (var rb in Utils.FindVisualChilds<RadioButton>(this, ExemptInputs))
                rb.IsEnabled = true;
        }

        private void LockSearchInputs() {
            SearchInput.IsEnabled = false;
            ActiveMemberInput.IsEnabled = false;
        }

        private void UnlockSearchInputs() {
            SearchInput.IsEnabled = true;
            ActiveMemberInput.IsEnabled = true;
        }

        private void FillInputs(Member m) {
            OriginalValues.Clear();

            MgNrInput.Text = m.MgNr.ToString();
            PredecessorMgNrInput.Text = m.PredecessorMgNr.ToString();
            PrefixInput.Text = m.Prefix;
            GivenNameInput.Text = m.GivenName;
            FamilyNameInput.Text = m.FamilyName;
            SuffixInput.Text = m.Suffix;
            BirthdayInput.Text = (m.Birthday != null) ? string.Join(".", m.Birthday.Split("-").Reverse()) : null;
            AddressInput.Text = m.Address;
            AT_Plz? p = m.PostalDest.Plz(Context);
            if (p != null) {
                PlzInput.Text = p.Plz.ToString();
                OrtInput.ItemsSource = p.Orte(Context);
                OrtInput.SelectedItem = p;
            } else {
                PlzInput.Text = null;
                OrtInput.ItemsSource = null;
                OrtInput.SelectedItem = null;
            }

            EmailInput.Text = m.Email;
            PhoneLandlineInput.Text = m.PhoneLandline;
            PhoneMobile1Input.Text = m.PhoneMobile1;
            PhoneMobile2Input.Text = m.PhoneMobile2;

            IbanInput.Text = m.Iban;
            BicInput.Text = m.Bic;

            UstIdInput.Text = m.UstId;
            LfbisNrInput.Text = m.LfbisNr;
            BuchführendInput.IsChecked = m.Buchführend;

            // TODO Rechnungsadresse

            EntryDateInput.Text = (m.EntryDate != null) ? string.Join(".", m.EntryDate.Split("-").Reverse()) : null;
            ExitDateInput.Text = (m.ExitDate != null) ? string.Join(".", m.ExitDate.Split("-").Reverse()) : null;
            BusinessSharesInput.Text = m.BusinessShares.ToString();
            AccountingNrInput.Text = m.AccountingNr;
            BranchInput.SelectedItem = m.Branch;
            DefaultKgInput.SelectedItem = m.DefaultKg;
            CommentInput.Text = m.Comment;
            ActiveInput.IsChecked = m.Active;
            VollLieferantInput.IsChecked = m.VollLieferant;
            FunkionärInput.IsChecked = m.Funktionär;
            switch (m.DefaultContact) {
                case "post": ContactPostInput.IsChecked = true; break;
                case "email": ContactEmailInput.IsChecked = true; break;
            }

            foreach (var tb in Utils.FindVisualChilds<TextBox>(this, ExemptInputs))
                OriginalValues[tb] = tb.Text;
            foreach (var cb in Utils.FindVisualChilds<ComboBox>(this, ExemptInputs))
                OriginalValues[cb] = cb.SelectedItem;
            foreach (var cb in Utils.FindVisualChilds<CheckBox>(this, ExemptInputs))
                OriginalValues[cb] = (cb.IsChecked ?? false) ? bool.TrueString : null;
            foreach (var rb in Utils.FindVisualChilds<RadioButton>(this, ExemptInputs))
                OriginalValues[rb] = (rb.IsChecked ?? false) ? bool.TrueString : null;
        }

        private void ClearInputs() {
            OriginalValues.Clear();
            foreach (var tb in Utils.FindVisualChilds<TextBox>(this, ExemptInputs))
                tb.Text = "";
            foreach (var cb in Utils.FindVisualChilds<ComboBox>(this, ExemptInputs))
                cb.SelectedItem = null;
            foreach (var cb in Utils.FindVisualChilds<CheckBox>(this, ExemptInputs))
                cb.IsChecked = false;
            foreach (var rb in Utils.FindVisualChilds<RadioButton>(this, ExemptInputs))
                rb.IsChecked = false;
        }

        private bool IsValid() {
            return Valid.All(kv => kv.Value) &&
                Utils.FindVisualChilds<ComboBox>(this, ExemptInputs).All(cb => cb.ItemsSource == null || cb.SelectedItem != null);
        }

        private void UpdateButtons() {
            if (!IsEditing && !IsCreating) return;
            bool ch = HasChanged(), v = IsValid();
            ResetButton.IsEnabled = (ch);
            SaveButton.IsEnabled = (v && ch);
        }

        private bool InputHasChanged(Control input) {
            if (!OriginalValues.ContainsKey(input)) {
                return false;
            } else if (input is TextBox tb) {
                return OriginalValues[tb]?.ToString() != tb.Text;
            } else if (input is ComboBox sb) {
                return OriginalValues[sb] != sb.SelectedItem;
            } else if (input is CheckBox cb) {
                return (OriginalValues[cb] != null) != (cb.IsChecked ?? false);
            } else if (input is RadioButton rb) {
                return (OriginalValues[rb] != null) != (rb.IsChecked ?? false);
            } else {
                return false;
            }
        }

        private bool HasChanged() {
            return !IsValid() ||
                Utils.FindVisualChilds<TextBox>(this, ExemptInputs).Any(InputHasChanged) ||
                Utils.FindVisualChilds<ComboBox>(this, ExemptInputs).Any(InputHasChanged) ||
                Utils.FindVisualChilds<CheckBox>(this, ExemptInputs).Any(InputHasChanged) ||
                Utils.FindVisualChilds<RadioButton>(this, ExemptInputs).Any(InputHasChanged);
        }

        private void UpdatePlz(TextBox plzInput, ComboBox ortInput) {
            if (plzInput.Text.Length == 4) {
                int plz = int.Parse(plzInput.Text);
                ortInput.ItemsSource = Context.Postleitzahlen.Where(p => p.Plz == plz).ToHashSet();
            } else {
                ortInput.ItemsSource = null;
            }
            ortInput.SelectedItem = null;
            Valid[plzInput] = (ortInput.ItemsSource != null);
            UpdateButtons();
        }

        private void InputTextChanged(TextBox input, bool optional, Func<TextBox, bool, ValidationResult> checker) {
            var res = checker(input, optional);
            Valid[input] = res.IsValid;
            if (res.IsValid) {
                if (InputHasChanged(input)) {
                    Utils.SetInputChanged(input);
                } else {
                    Utils.ClearInputState(input);
                }
            } else {
                Utils.SetInputInvalid(input);
            }
            UpdateButtons();
        }

        private void InputLostFocus(TextBox input, bool optional, Func<TextBox, bool, ValidationResult> checker, string? msg) {
            var res = checker(input, optional);
            if (!res.IsValid)
                MessageBox.Show(res.ErrorContent.ToString(), msg ?? res.ErrorContent.ToString(), MessageBoxButton.OK, MessageBoxImage.Warning);
        }

        private void CheckBox_Changed(object sender, RoutedEventArgs e) {
            var input = (CheckBox)sender;
            if (InputHasChanged(input)) {
                Utils.SetInputChanged(input);
            } else {
                Utils.ClearInputState(input);
            }
            UpdateButtons();
        }

        private void RadioButton_Changed(object sender, RoutedEventArgs e) {
            var input = (RadioButton)sender;
            if (InputHasChanged(input)) {
                Utils.SetInputChanged(input);
            } else {
                Utils.ClearInputState(input);
            }
            UpdateButtons();
        }

        private void TextBox_TextChanged(object sender, RoutedEventArgs e) {
             var input = (TextBox)sender;
            if (InputHasChanged(input)) {
                Utils.SetInputChanged(input);
            } else {
                Utils.ClearInputState(input);
            }
            UpdateButtons();
        }

        private void ComboBox_SelectionChanged(object sender, RoutedEventArgs e) {
            var input = (ComboBox)sender;
            if (InputHasChanged(input)) {
                // TODO not working
                Utils.SetInputChanged(input);
            } else {
                Utils.ClearInputState(input);
            }
            UpdateButtons();
        }

        private void PlzInput_TextChanged(object sender, RoutedEventArgs e) {
            InputTextChanged((TextBox)sender, false, Validator.CheckPlz);
            UpdatePlz((TextBox)sender, OrtInput);
        }

        private void PlzInput_LostFocus(object sender, RoutedEventArgs e) {
            InputLostFocus((TextBox)sender, true, Validator.CheckPlz, null);
            UpdatePlz((TextBox)sender, OrtInput);
        }

        private void PhoneNrInput_TextChanged(object sender, RoutedEventArgs e) {
            InputTextChanged((TextBox)sender, true, Validator.CheckPhoneNumber);
        }

        private void PhoneNrInput_LostFocus(object sender, RoutedEventArgs e) {
            InputLostFocus((TextBox)sender, true, Validator.CheckPhoneNumber, null);
        }

        private void EmailInput_TextChanged(object sender, RoutedEventArgs e) {
            InputTextChanged((TextBox)sender, true, Validator.CheckEmailAddress);
        }

        private void EmailInput_LostFocus(object sender, RoutedEventArgs e) {
            InputLostFocus((TextBox)sender, true, Validator.CheckEmailAddress, null);
        }

        private void IbanInput_TextChanged(object sender, RoutedEventArgs e) {
            InputTextChanged((TextBox)sender, true, Validator.CheckIban);
        }

        private void IbanInput_LostFocus(object sender, RoutedEventArgs e) {
            InputLostFocus((TextBox)sender, true, Validator.CheckIban, null);
        }

        private void BicInput_TextChanged(object sender, RoutedEventArgs e) {
            InputTextChanged((TextBox)sender, true, Validator.CheckBic);
        }

        private void BicInput_LostFocus(object sender, RoutedEventArgs e) {
            InputLostFocus((TextBox)sender, true, Validator.CheckBic, null);
        }

        private void LfbisNrInput_TextChanged(object sender, RoutedEventArgs e) {
            InputTextChanged((TextBox)sender, true, Validator.CheckLfbisNr);
        }

        private void LfbisNrInput_LostFocus(object sender, RoutedEventArgs e) {
            InputLostFocus((TextBox)sender, true, Validator.CheckLfbisNr, "Betriebsnummer ungültig");
        }

        private void BillingPlzInput_TextChanged(object sender, RoutedEventArgs e) {
            InputTextChanged((TextBox)sender, true, Validator.CheckPlz);
            UpdatePlz((TextBox)sender, BillingOrtInput);
        }

        private void BillingPlzInput_LostFocus(object sender, RoutedEventArgs e) {
            InputLostFocus((TextBox)sender, true, Validator.CheckPlz, null);
            UpdatePlz((TextBox)sender, BillingOrtInput);
        }
    }
}