using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using CommunityToolkit.Mvvm.Messaging;
using Microsoft.Toolkit.Uwp.Notifications;
using Microsoft.UI.Xaml;
using Serilog;
using Windows.Data.Xml.Dom;
using Windows.UI.Notifications;
using Wino.Core.Domain;
using Wino.Core.Domain.Entities.Calendar;
using Wino.Core.Domain.Entities.Mail;
using Wino.Core.Domain.Entities.Shared;
using Wino.Core.Domain.Enums;
using Wino.Core.Domain.Extensions;
using Wino.Core.Domain.Interfaces;
using Wino.Messaging.UI;

namespace Wino.Mail.WinUI.Services;

public class NotificationBuilder : INotificationBuilder
{
    private const string MailApplicationId = "App";
    private const string NotificationIconRootUri = "ms-appx:///Assets/NotificationIcons/";
    private static readonly int[] SupportedIconScales = [100, 125, 150, 200, 400];

    private readonly IAccountService _accountService;
    private readonly IFolderService _folderService;
    private readonly IMailService _mailService;
    private readonly IThumbnailService _thumbnailService;
    private readonly IPreferencesService _preferencesService;
    private readonly IUnderlyingThemeService _underlyingThemeService;

    public NotificationBuilder(IAccountService accountService,
                               IFolderService folderService,
                               IMailService mailService,
                               IThumbnailService thumbnailService,
                               IPreferencesService preferencesService,
                               IUnderlyingThemeService underlyingThemeService)
    {
        _accountService = accountService;
        _folderService = folderService;
        _mailService = mailService;
        _thumbnailService = thumbnailService;
        _preferencesService = preferencesService;
        _underlyingThemeService = underlyingThemeService;

        WeakReferenceMessenger.Default.Register<MailReadStatusChanged>(this, (r, msg) =>
        {
            RemoveNotification(msg.UniqueId);
        });
    }

    public async Task CreateNotificationsAsync(IEnumerable<MailCopy> downloadedMailItems)
    {
        try
        {
            // Filter mails to only include Inbox folder items
            var inboxMailItems = new List<MailCopy>();

            foreach (var item in downloadedMailItems)
            {
                var mailItem = await _mailService.GetSingleMailItemAsync(item.UniqueId);

                //if (mailItem == null || mailItem.AssignedFolder == null)
                //    continue;

                //// Only create notifications for Inbox folder mails
                //if (mailItem.AssignedFolder.SpecialFolderType != SpecialFolderType.Inbox)
                //    continue;

                //// Skip folders with synchronization disabled
                //if (!mailItem.AssignedFolder.IsSynchronizationEnabled)
                //    continue;

                //// Skip already read mails
                //if (mailItem.IsRead)
                //{
                //    RemoveNotification(mailItem.UniqueId);
                //    continue;
                //}

                inboxMailItems.Add(mailItem);
            }

            var mailCount = inboxMailItems.Count;

            if (mailCount == 0)
                return;

            // If there are more than 3 mails, just display 1 general toast.
            if (mailCount > 3)
            {
                var builder = new ToastContentBuilder();
                builder.SetToastScenario(ToastScenario.Default);

                builder.AddText(Translator.Notifications_MultipleNotificationsTitle);
                builder.AddText(string.Format(Translator.Notifications_MultipleNotificationsMessage, mailCount));
                builder.AddArgument(Constants.ToastModeKey, Constants.ToastModeMail);

                builder.AddButton(GetDismissButton());
                builder.AddAudio(new ToastAudio()
                {
                    Src = new Uri("ms-winsoundevent:Notification.Mail")
                });

                ShowToast(builder);
            }
            else
            {
                foreach (var mailItem in inboxMailItems)
                {
                    await CreateSingleNotificationAsync(mailItem);
                }

                await UpdateTaskbarIconBadgeAsync();
            }
        }
        catch (Exception ex)
        {
            Log.Error(ex, "Failed to create notifications.");
        }
    }

    private async Task CreateSingleNotificationAsync(MailCopy mailItem)
    {
        var builder = new ToastContentBuilder();
        builder.SetToastScenario(ToastScenario.Default);

        var avatarThumbnail = await _thumbnailService.GetThumbnailAsync(mailItem.FromAddress, awaitLoad: true);
        if (!string.IsNullOrEmpty(avatarThumbnail))
        {
            var tempFile = await Windows.Storage.ApplicationData.Current.TemporaryFolder.CreateFileAsync($"{Guid.NewGuid()}.png", Windows.Storage.CreationCollisionOption.ReplaceExisting);
            await using (var stream = await tempFile.OpenStreamForWriteAsync())
            {
                var bytes = Convert.FromBase64String(avatarThumbnail);
                await stream.WriteAsync(bytes);
            }
            builder.AddAppLogoOverride(new Uri($"ms-appdata:///temp/{tempFile.Name}"), hintCrop: ToastGenericAppLogoCrop.Default);
        }

        // Override system notification timestamp with received date of the mail.
        builder.AddCustomTimeStamp(mailItem.CreationDate.ToLocalTime());

        builder.AddText(mailItem.FromName);
        builder.AddText(mailItem.Subject);
        builder.AddText(mailItem.PreviewText);

        builder.AddArgument(Constants.ToastMailUniqueIdKey, mailItem.UniqueId.ToString());
        builder.AddArgument(Constants.ToastActionKey, MailOperation.Navigate);
        builder.AddArgument(Constants.ToastModeKey, Constants.ToastModeMail);

        builder.AddButton(GetMarkAsReadButton(mailItem.UniqueId));
        builder.AddButton(GetDeleteButton(mailItem.UniqueId));
        builder.AddButton(GetArchiveButton(mailItem.UniqueId));
        builder.AddAudio(new ToastAudio()
        {
            Src = new Uri("ms-winsoundevent:Notification.Mail")
        });

        // Use UniqueId as tag to allow removal
        ShowToast(builder, mailItem.UniqueId.ToString());
    }

    private ToastButton GetDismissButton()
        => new ToastButton()
        .SetDismissActivation()
        .SetImageUri(GetNotificationIconUri("dismiss"));

    private ToastButton GetArchiveButton(Guid mailUniqueId)
        => new ToastButton()
        .SetContent(Translator.MailOperation_Archive)
        .SetImageUri(GetNotificationIconUri("mail-archive"))
        .AddArgument(Constants.ToastMailUniqueIdKey, mailUniqueId.ToString())
        .AddArgument(Constants.ToastActionKey, MailOperation.Archive)
        .AddArgument(Constants.ToastModeKey, Constants.ToastModeMail)
        .SetBackgroundActivation();

    private ToastButton GetDeleteButton(Guid mailUniqueId)
        => new ToastButton()
        .SetContent(Translator.MailOperation_Delete)
        .SetImageUri(GetNotificationIconUri("mail-delete"))
        .AddArgument(Constants.ToastMailUniqueIdKey, mailUniqueId.ToString())
        .AddArgument(Constants.ToastActionKey, MailOperation.SoftDelete)
        .AddArgument(Constants.ToastModeKey, Constants.ToastModeMail)
        .SetBackgroundActivation();

    private ToastButton GetMarkAsReadButton(Guid mailUniqueId)
        => new ToastButton()
        .SetContent(Translator.MailOperation_MarkAsRead)
        .SetImageUri(GetNotificationIconUri("mail-markread"))
        .AddArgument(Constants.ToastMailUniqueIdKey, mailUniqueId.ToString())
        .AddArgument(Constants.ToastActionKey, MailOperation.MarkAsRead)
        .AddArgument(Constants.ToastModeKey, Constants.ToastModeMail)
        .SetBackgroundActivation();

    public async Task UpdateTaskbarIconBadgeAsync()
    {
        int totalUnreadCount = 0;

        try
        {
            var badgeUpdater = BadgeUpdateManager.CreateBadgeUpdaterForApplication(MailApplicationId);
            var accounts = await _accountService.GetAccountsAsync();

            foreach (var account in accounts)
            {
                if (!account.Preferences.IsTaskbarBadgeEnabled) continue;

                var accountInbox = await _folderService.GetSpecialFolderByAccountIdAsync(account.Id, SpecialFolderType.Inbox);

                if (accountInbox == null)
                    continue;

                var inboxUnreadCount = await _folderService.GetFolderNotificationBadgeAsync(accountInbox.Id);

                totalUnreadCount += inboxUnreadCount;
            }

            if (totalUnreadCount > 0)
            {
                // Get the blank badge XML payload for a badge number
                XmlDocument badgeXml = BadgeUpdateManager.GetTemplateContent(BadgeTemplateType.BadgeNumber);

                // Set the value of the badge in the XML to our number
                XmlElement? badgeElement = badgeXml.SelectSingleNode("/badge") as XmlElement;
                if (badgeElement == null)
                {
                    badgeUpdater.Clear();
                    return;
                }
                badgeElement.SetAttribute("value", totalUnreadCount.ToString());

                // Create the badge notification
                BadgeNotification badge = new BadgeNotification(badgeXml);

                // And update the badge
                badgeUpdater.Update(badge);
            }
            else
                badgeUpdater.Clear();
        }
        catch (Exception ex)
        {
            Log.Error(ex, "Error while updating taskbar badge.");
        }
    }

    public void RemoveNotification(Guid mailUniqueId)
    {
        try
        {
            ToastNotificationManager.History.Remove(mailUniqueId.ToString(), null);
        }
        catch (ArgumentException)
        {
            // Notification does not exists. Ignore.
        }
        catch (Exception ex)
        {
            Log.Error(ex, $"Failed to remove notification for mail {mailUniqueId}");
        }
    }

    public void CreateAttentionRequiredNotification(MailAccount account)
    {
        var builder = new ToastContentBuilder();
        builder.SetToastScenario(ToastScenario.Default);

        builder.AddText(Translator.Exception_AccountNeedsAttention_Title);
        builder.AddText(string.Format(Translator.Exception_AccountNeedsAttention_Message, account.Name));

        builder.AddButton(GetDismissButton());

        builder.AddArgument(Constants.ToastMailAccountIdKey, account.Id.ToString());
        builder.AddArgument(Constants.ToastModeKey, Constants.ToastModeMail);
        builder.AddButton(new ToastButton().SetContent(Translator.Buttons_FixAccount));
        ShowToast(builder);
    }

    public void CreateWebView2RuntimeMissingNotification()
    {
        var builder = new ToastContentBuilder();
        builder.SetToastScenario(ToastScenario.Default);

        builder.AddText(Translator.Exception_WebView2RuntimeMissing_Title);
        builder.AddText(Translator.Exception_WebView2RuntimeMissing_Message);

        builder.AddButton(GetDismissButton());
        builder.AddArgument(Constants.ToastModeKey, Constants.ToastModeMail);
        ShowToast(builder);
    }

    public Task CreateCalendarReminderNotificationAsync(CalendarItem calendarItem, long reminderDurationInSeconds)
    {
        if (calendarItem == null)
            return Task.CompletedTask;

        var builder = new ToastContentBuilder();
        builder.SetToastScenario(ToastScenario.Reminder);

        var localStart = calendarItem.GetLocalStartDate();
        var nowLocal = DateTime.Now;
        var reminderContext = GetCalendarReminderContext(localStart, nowLocal);

        builder.AddText(calendarItem.Title);
        builder.AddText($"{reminderContext} - {localStart:g}");

        if (!string.IsNullOrWhiteSpace(calendarItem.Location))
            builder.AddText(calendarItem.Location);

        builder.AddArgument(Constants.ToastCalendarActionKey, Constants.ToastCalendarNavigateAction);
        builder.AddArgument(Constants.ToastCalendarItemIdKey, calendarItem.Id.ToString());
        builder.AddArgument(Constants.ToastModeKey, Constants.ToastModeCalendar);

        var allowedSnoozeMinutes = CalendarReminderSnoozeOptions.GetAllowedSnoozeMinutes(
            reminderDurationInSeconds,
            _preferencesService.DefaultReminderDurationInSeconds);

        if (allowedSnoozeMinutes.Count > 0)
        {
            var preferredSnoozeMinutes = _preferencesService.DefaultSnoozeDurationInMinutes;
            var defaultSnoozeMinutes = allowedSnoozeMinutes.Contains(preferredSnoozeMinutes)
                ? preferredSnoozeMinutes
                : allowedSnoozeMinutes[0];

            var selectionBox = new ToastSelectionBox(Constants.ToastCalendarSnoozeDurationInputId)
            {
                DefaultSelectionBoxItemId = defaultSnoozeMinutes.ToString()
            };

            foreach (var snoozeMinutes in allowedSnoozeMinutes)
            {
                selectionBox.Items.Add(new ToastSelectionBoxItem(
                    snoozeMinutes.ToString(),
                    string.Format(Translator.CalendarReminder_SnoozeMinutesOption, snoozeMinutes)));
            }

            builder.AddToastInput(selectionBox);
            var snoozeButton = new ToastButton()
                .SetContent(Translator.CalendarReminder_SnoozeAction)
                .SetImageUri(GetNotificationIconUri("calendar-snooze"))
                .SetBackgroundActivation();

            builder.AddButton(snoozeButton)
                .AddArgument(Constants.ToastCalendarActionKey, Constants.ToastCalendarSnoozeAction)
                .AddArgument(Constants.ToastCalendarItemIdKey, calendarItem.Id.ToString())
                .AddArgument(Constants.ToastModeKey, Constants.ToastModeCalendar);
        }

        builder.AddButton(new ToastButton()
            .SetDismissActivation()
            .SetImageUri(GetNotificationIconUri("dismiss")));

        if (Uri.TryCreate(calendarItem.HtmlLink, UriKind.Absolute, out var joinUri))
        {
            builder.AddButton(new ToastButton()
                .SetContent(Translator.CalendarEventDetails_JoinOnline)
                .SetImageUri(GetNotificationIconUri("calendar-join"))
                .SetProtocolActivation(joinUri));
        }

        builder.AddAudio(new ToastAudio()
        {
            Src = new Uri("ms-winsoundevent:Notification.Reminder")
        });

        var tag = $"calendar-reminder-{calendarItem.Id:N}-{reminderDurationInSeconds}";
        ShowToast(builder, tag);

        return Task.CompletedTask;
    }

    private static string GetCalendarReminderContext(DateTime localStart, DateTime nowLocal)
    {
        var delta = localStart - nowLocal;
        var absDelta = delta.Duration();

        if (absDelta < TimeSpan.FromMinutes(1))
            return delta.TotalSeconds >= 0 ? Translator.CalendarReminder_StartingNow : Translator.CalendarReminder_StartedNow;

        if (delta.TotalSeconds > 0)
        {
            if (delta.TotalHours >= 1)
            {
                var hours = Math.Max(1, (int)Math.Floor(delta.TotalHours));
                return string.Format(Translator.CalendarReminder_StartsInHours, hours);
            }

            var minutes = Math.Max(1, (int)Math.Floor(delta.TotalMinutes));
            return string.Format(Translator.CalendarReminder_StartsInMinutes, minutes);
        }

        if (absDelta.TotalHours >= 1)
        {
            var hoursAgo = Math.Max(1, (int)Math.Floor(absDelta.TotalHours));
            return string.Format(Translator.CalendarReminder_StartedHoursAgo, hoursAgo);
        }

        var minutesAgo = Math.Max(1, (int)Math.Floor(absDelta.TotalMinutes));
        return string.Format(Translator.CalendarReminder_StartedMinutesAgo, minutesAgo);
    }

    private static void ShowToast(ToastContentBuilder builder, string? tag = null)
    {
        var toastNotification = new ToastNotification(builder.GetToastContent().GetXml());

        if (!string.IsNullOrWhiteSpace(tag))
        {
            toastNotification.Tag = tag;
        }

        var notifier = ToastNotificationManager.CreateToastNotifier();
        notifier.Show(toastNotification);
    }

    private Uri GetNotificationIconUri(string iconName)
    {
        var theme = _underlyingThemeService.IsUnderlyingThemeDark() ? "dark" : "light";
        var scale = GetClosestAvailableScale();
        return new($"{NotificationIconRootUri}{iconName}.theme-{theme}.scale-{scale}.png");
    }

    private static int GetClosestAvailableScale()
    {
        var rasterScale = 1.0;

        if (WinoApplication.MainWindow?.Content is FrameworkElement rootElement &&
            rootElement.XamlRoot != null)
        {
            rasterScale = rootElement.XamlRoot.RasterizationScale;
        }

        var requestedScale = (int)Math.Round(rasterScale * 100);
        return SupportedIconScales.OrderBy(s => Math.Abs(s - requestedScale)).First();
    }
}