using Avalonia.Controls;
using Avalonia.Interactivity;
using Avalonia.Platform.Storage;
using Nonemm.App.Configuration;
using Nonemm.App.Dialogs;
using Nonemm.Core;
using Nonemm.Formats.Adif;
using Nonemm.Formats.Cabrillo;
using Nonemm.Storage;

namespace Nonemm.App.Windows;

/// The entry window's menu. Each item does one thing and says what happened in
/// the status line.
public sealed partial class EntryWindow
{
    private static readonly HttpClient Http = new() { Timeout = TimeSpan.FromSeconds(30) };

    private async void OnNewDatabase(object? sender, RoutedEventArgs e)
    {
        IStorageFile? file = await StorageProvider.SaveFilePickerAsync(new FilePickerSaveOptions
        {
            Title = "New log database",
            SuggestedFileName = "ham.s3db",
            DefaultExtension = "s3db",
            SuggestedStartLocation = await Folder(session.Paths.Databases),
        });
        OpenDatabaseAt(file);
    }

    private async void OnOpenDatabase(object? sender, RoutedEventArgs e)
    {
        IReadOnlyList<IStorageFile> files = await StorageProvider.OpenFilePickerAsync(new FilePickerOpenOptions
        {
            Title = "Open log database",
            AllowMultiple = false,
            SuggestedStartLocation = await Folder(session.Paths.Databases),
        });
        OpenDatabaseAt(files.FirstOrDefault());
    }

    private void OpenDatabaseAt(IStorageFile? file)
    {
        if (file?.TryGetLocalPath() is not { } path)
        {
            return;
        }
        try
        {
            session.OpenDatabase(path);
            Status($"log database {Path.GetFileName(path)}");
        }
        catch (Exception error) when (error is IOException or InvalidOperationException)
        {
            Status($"could not open {path}: {error.Message}");
        }
    }

    private async void OnNewContest(object? sender, RoutedEventArgs e)
    {
        if (!HasDatabase())
        {
            return;
        }
        ContestSetupDialog dialog = new(session);
        ContestInstance? chosen = await dialog.ShowDialog<ContestInstance?>(this);
        if (chosen is null)
        {
            return;
        }
        session.StartContest(chosen);
        Status($"{chosen.ContestName} started");
    }

    private async void OnOpenContest(object? sender, RoutedEventArgs e)
    {
        if (!HasDatabase())
        {
            return;
        }
        ContestPickerDialog dialog = new(session.Store.Contests());
        int? chosen = await dialog.ShowDialog<int?>(this);
        if (chosen is not null)
        {
            session.OpenContest(chosen.Value);
        }
    }

    private async void OnExportCabrillo(object? sender, RoutedEventArgs e)
    {
        if (Logging is null)
        {
            Status("no contest is open");
            return;
        }
        IStorageFile? file = await StorageProvider.SaveFilePickerAsync(new FilePickerSaveOptions
        {
            Title = "Export Cabrillo",
            SuggestedFileName = $"{session.Settings.Station.Callsign}.log",
        });
        if (file?.TryGetLocalPath() is not { } path)
        {
            return;
        }
        CabrilloWriter writer = new(Logging.Contest, Logging.Me);
        CabrilloHeader header = new()
        {
            Contest = Logging.Contest.CabrilloName,
            Callsign = Logging.Me.Callsign,
            OperatorCategory = Logging.Instance.OperatorCategory,
            AssistedCategory = Logging.Instance.AssistedCategory,
            BandCategory = Logging.Instance.BandCategory,
            ModeCategory = Logging.Instance.ModeCategory,
            PowerCategory = Logging.Instance.PowerCategory,
            StationCategory = Logging.Instance.StationCategory,
            TransmitterCategory = Logging.Instance.TransmitterCategory,
            OverlayCategory = Logging.Instance.OverlayCategory,
            TimeCategory = Logging.Instance.TimeCategory,
            ClaimedScore = Logging.Log.TotalScore,
            Club = Logging.Me.Club,
            Name = Logging.Me.Name,
            Operators = Logging.Instance.Operators,
            Soapbox = Logging.Instance.Soapbox,
        };
        await File.WriteAllTextAsync(path, writer.Write(header, Logging.Log.Qsos));
        Status($"{Logging.Log.Qsos.Count} contacts written to {Path.GetFileName(path)}");
    }

    private async void OnExportAdif(object? sender, RoutedEventArgs e)
    {
        if (Logging is null)
        {
            Status("no contest is open");
            return;
        }
        IStorageFile? file = await StorageProvider.SaveFilePickerAsync(new FilePickerSaveOptions
        {
            Title = "Export ADIF",
            SuggestedFileName = $"{session.Settings.Station.Callsign}.adi",
        });
        if (file?.TryGetLocalPath() is not { } path)
        {
            return;
        }
        await File.WriteAllTextAsync(path, new AdifWriter(Logging.Me).Write(Logging.Log.Qsos));
        Status($"{Logging.Log.Qsos.Count} contacts written to {Path.GetFileName(path)}");
    }

    private async void OnImportAdif(object? sender, RoutedEventArgs e)
    {
        if (Logging is null)
        {
            Status("no contest is open");
            return;
        }
        IReadOnlyList<IStorageFile> files = await StorageProvider.OpenFilePickerAsync(new FilePickerOpenOptions
        {
            Title = "Import ADIF",
            AllowMultiple = false,
        });
        if (files.FirstOrDefault()?.TryGetLocalPath() is not { } path)
        {
            return;
        }
        IReadOnlyList<Qso> read = AdifReader.Read(
            await File.ReadAllTextAsync(path),
            Logging.Contest.Name,
            Logging.Instance.ContestNumber);
        foreach (Qso qso in read)
        {
            session.Store.Add(qso);
        }
        session.OpenContest(Logging.Instance.ContestNumber);
        Status($"{read.Count} contacts read from {Path.GetFileName(path)}");
    }

    private void OnExit(object? sender, RoutedEventArgs e) => Close();

    private void OnShowLog(object? sender, RoutedEventArgs e) => Show(() => new LogWindow(session));

    private void OnShowCheck(object? sender, RoutedEventArgs e) => Show(() => new CheckWindow(session, () => Logging?.Entry.Call ?? ""));

    private void OnShowBandmap(object? sender, RoutedEventArgs e) => Show(() => new BandmapWindow(session, Tune));

    private void OnShowScore(object? sender, RoutedEventArgs e) => Show(() => new ScoreWindow(session));

    private void OnShowPacket(object? sender, RoutedEventArgs e) => Show(() => new PacketWindow(session));

    private async void OnStationSettings(object? sender, RoutedEventArgs e)
    {
        StationDialog dialog = new(session.Settings.Station);
        StoredStation? updated = await dialog.ShowDialog<StoredStation?>(this);
        if (updated is not null)
        {
            session.Save(session.Settings with { Station = updated });
            if (Logging is not null)
            {
                session.OpenContest(Logging.Instance.ContestNumber);
            }
        }
    }

    private async void OnRadioSettings(object? sender, RoutedEventArgs e)
    {
        RadioDialog dialog = new(session.Settings);
        Settings? updated = await dialog.ShowDialog<Settings?>(this);
        if (updated is null)
        {
            return;
        }
        session.Save(updated);
        if (updated.RadioEnabled)
        {
            session.ConnectRadio();
            Status($"radio: rigctld at {updated.RigctldHost}:{updated.RigctldPort}");
        }
        else
        {
            session.DisconnectRadio();
            Status("radio disconnected");
        }
    }

    private async void OnClusterSettings(object? sender, RoutedEventArgs e)
    {
        ClusterDialog dialog = new(session.Settings);
        Settings? updated = await dialog.ShowDialog<Settings?>(this);
        if (updated is null)
        {
            return;
        }
        session.Save(updated);
        if (updated.ClusterEnabled)
        {
            session.ConnectCluster();
            Status($"cluster: {updated.ClusterHost}:{updated.ClusterPort}");
        }
        else
        {
            session.DisconnectCluster();
            Status("cluster disconnected");
        }
    }

    private async void OnNetworkSettings(object? sender, RoutedEventArgs e)
    {
        NetworkDialog dialog = new(session.Settings);
        Settings? updated = await dialog.ShowDialog<Settings?>(this);
        if (updated is not null)
        {
            session.Save(updated);
            session.ApplyNetworkSettings();
            Status(updated.NetworkEnabled ? "networked with the other stations" : "networking off");
        }
    }

    private async void OnDownloadCountryFile(object? sender, RoutedEventArgs e) =>
        await Download(
            downloader => downloader.DownloadCountryFileAsync(session.Paths.CountryFile),
            "country file");

    private async void OnDownloadCallDatabase(object? sender, RoutedEventArgs e) =>
        await Download(
            downloader => downloader.DownloadCallDatabaseAsync(session.Paths.CallDatabaseFile),
            "callsign database");

    private void OnReloadSupportFiles(object? sender, RoutedEventArgs e)
    {
        session.ReloadSupportFiles();
        Status($"country file {(session.Countries is null ? "missing" : "loaded")}, " +
               $"{session.Calls.Count} callsigns");
    }

    private async Task Download(Func<SupportFileDownloader, Task<string>> fetch, string what)
    {
        Status($"fetching the {what}…");
        try
        {
            string result = await fetch(new SupportFileDownloader(Http));
            session.ReloadSupportFiles();
            Status($"{what}: {result}");
        }
        catch (Exception error) when (error is InvalidOperationException or IOException)
        {
            Status(error.Message);
        }
    }

    private void Tune(Frequency frequency, string call)
    {
        if (Logging is null)
        {
            return;
        }
        Logging.Tune(frequency);
        _ = session.Radio?.TuneAsync(frequency);
        Logging.Entry.Call = call;
        SyncBoxes();
        boxes[0].Focus();
        Refresh();
    }

    private bool HasDatabase()
    {
        if (session.Settings.DatabasePath.Length > 0)
        {
            return true;
        }
        Status("open a log database first: File ▸ New Database");
        return false;
    }

    private void Show<T>(Func<T> create) where T : Window
    {
        if (openWindows.TryGetValue(typeof(T), out Window? existing))
        {
            existing.Activate();
            return;
        }
        T window = create();
        openWindows[typeof(T)] = window;
        window.Closed += (_, _) => openWindows.Remove(typeof(T));
        window.Show(this);
    }

    private async Task<IStorageFolder?> Folder(string path) =>
        await StorageProvider.TryGetFolderFromPathAsync(path);
}