using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Avalonia.Threading;

namespace Logof_Client;

public class AddressCheck
{
    public enum ErrorTypes
    {
        PlzNotUsable,
        PPlzNotUsable,
        MayBeSameAddress,
        NoPLZorPPLZ
    }

    public enum WarningTypes
    {
        NoCity,
        NoStreet,
        NoLastName,
        NoFirstName,
        NoStreetNumber,
        NoPLZ,
        NoPPLZ,
        DoubledRefsid,
        FullAddressTooLong
    }

    private readonly ProgressWindow _progress;

    public AddressCheck(ProgressWindow progressWindow)
    {
        _progress = progressWindow;
    }

    public async Task<List<KasPerson>> Perform(int id)
    {
        try
        {
            // Find the index of the address set with the given id
            var adset_index = -1;
            for (var i = 0; i < Settings._instance.addressSets.addresses.Count; i++)
                if (Settings._instance.addressSets.addresses[i].ID == id)
                {
                    adset_index = i;
                    break;
                }

            if (adset_index == -1) return new List<KasPerson>();

            var adset = Settings._instance.addressSets.addresses[adset_index];
            var total = adset.KasPersons.Count;
            var current = 0;

            await Task.Run(async () =>
            {
                
                // Refsids, die mehrfach vorkommen
                var doubledRefsids = adset.KasPersons
                    .Where(p => p.refsid > 0)
                    .GroupBy(p => p.refsid)
                    .Where(g => g.Count() > 1)
                    .ToDictionary(g => g.Key, g => true);

                // Adressen, die mehrfach vorkommen
                var doubledAddresses = adset.KasPersons
                    .GroupBy(p => (
                        p.name,
                        p.strasse,
                        p.vorname,
                        p.ort,
                        p.funktion,
                        p.funktion2,
                        p.funktionad,
                        p.abteilung,
                        p.name1,
                        p.name2,
                        p.name3,
                        p.name4,
                        p.name5))
                    .Where(g => g.Count() > 1)
                    .ToDictionary(g => g.Key, g => true);
                
                foreach (var person in adset.KasPersons)
                {
                    var errors = new List<ErrorTypes>();
                    var warnings = new List<WarningTypes>();
                    var hasFaults = false;

                    var address_component_count = 2; // cause anrede and name are first

                    // PLZ-Prüfung
                    if (person.plz == "" || person.plz == null)
                    {
                        hasFaults = true;
                        warnings.Add(WarningTypes.NoPLZ);
                    }
                    else
                    {
                        if (!AddressCreator.CheckPLZ(person.plz, person.land))
                        {
                            hasFaults = true;
                            errors.Add(ErrorTypes.PlzNotUsable);
                        }
                    }


                    // PPLZ-Prüfung
                    if (person.pplz == "" || person.pplz == null)
                    {
                        hasFaults = true;
                        warnings.Add(WarningTypes.NoPPLZ);
                    }
                    else
                    {
                        if (!AddressCreator.CheckPLZ(person.pplz, person.land))
                        {
                            hasFaults = true;
                            errors.Add(ErrorTypes.PPlzNotUsable);
                        }
                    }

                    if (warnings.Contains(WarningTypes.NoPLZ) && warnings.Contains(WarningTypes.NoPPLZ))
                    {
                        hasFaults = true;
                        errors.Add(ErrorTypes.NoPLZorPPLZ);
                    }

                    // Ort-Prüfung
                    if (string.IsNullOrWhiteSpace(person.ort))
                    {
                        hasFaults = true;
                        warnings.Add(WarningTypes.NoCity);
                    }
                    else
                    {
                        address_component_count++;
                    }

                    // Street-Number
                    var street = person.strasse.ToCharArray();
                    var intcount = 0;
                    foreach (var c in street)
                    {
                        int maybe;
                        if (int.TryParse(c.ToString(), out maybe)) intcount++;
                    }

                    if (intcount == 0)
                    {
                        hasFaults = true;
                        warnings.Add(WarningTypes.NoStreetNumber);
                    }

                    // Last-Name
                    if (string.IsNullOrWhiteSpace(person.name))
                    {
                        hasFaults = true;
                        warnings.Add(WarningTypes.NoLastName);
                    }

                    // First-Name
                    if (string.IsNullOrWhiteSpace(person.vorname))
                    {
                        hasFaults = true;
                        warnings.Add(WarningTypes.NoFirstName);
                    }

                    // Street-Check
                    if (string.IsNullOrWhiteSpace(person.strasse))
                    {
                        hasFaults = true;
                        warnings.Add(WarningTypes.NoStreet);
                    }
                    else
                    {
                        address_component_count++;
                    }

                    // Address-Component-Count
                    // Double-Refsid
                    if (person.refsid > 0 &&
                        doubledRefsids.ContainsKey(person.refsid))
                    {
                        hasFaults = true;
                        warnings.Add(WarningTypes.DoubledRefsid);
                    }
                    
                    // Double-Address
                    var addressKey = (
                        person.name,
                        person.strasse,
                        person.vorname,
                        person.ort,
                        person.funktion,
                        person.funktion2,
                        person.funktionad,
                        person.abteilung,
                        person.name1,
                        person.name2,
                        person.name3,
                        person.name4,
                        person.name5);
                    
                    if (doubledAddresses.ContainsKey(addressKey))
                    {
                        hasFaults = true;
                        errors.Add(ErrorTypes.MayBeSameAddress);
                    }

                    // Adressen-Länge
                    if (address_component_count > 10)
                    {
                        hasFaults = true;
                        warnings.Add(WarningTypes.FullAddressTooLong);
                    }

                    if (hasFaults)
                        lock (Settings._instance.addressSets.addresses)
                        {
                            // Directly set PersonError in the address set
                            var person_index = adset.KasPersons.IndexOf(person);
                            if (person_index >= 0)
                                Settings._instance.addressSets.addresses[adset_index].KasPersons[person_index]
                                        .PersonError =
                                    new KasPersonError((errors, warnings));
                        }

                    // Fortschritt aktualisieren
                    // Interlocked.Increment(ref current);
                    // var percent = current / (double)total * 100;
                    // await Dispatcher.UIThread.InvokeAsync(() =>
                    // {
                    //     if (hasFaults)
                    //         _progress.AddToLog($"Person mit id {person.id} ist fehlerhaft",
                    //             Convert.ToInt32(percent).ToString());
                    //
                    //     _progress.ChangePercentage(percent);
                    // });
                    
                    var cd = Interlocked.Increment(ref current);

                    if (cd % 10 == 0)
                    {
                        var percent = cd / (double)total * 100;

                        await Dispatcher.UIThread.InvokeAsync(() =>
                            _progress.ChangePercentage(percent));
                    }
                }
            });

            Settings.Save();

            // Return only the persons with errors from the address set
            return Settings._instance.addressSets.addresses[adset_index].KasPersons
                .Where(p => p.PersonError != null)
                .ToList();
        }
        catch (Exception ex)
        {
            Logger.Log($"Error while performing address check: {ex.Message}", Logger.LogType.Error);
        }

        return null;
    }

}