using Plugin.LocalNotification;

namespace WguApp.Services;

public static class LocalNotificationService
{
    private static readonly Random Rng = new();
    
    public static async Task<int?> ScheduleNotification(string title, string description, DateTime time)
    {
        var permCheck = await PermissionsService.CheckNotificationPermissions();
        if (!permCheck)
        {
            LoggerService.LogToFile("Notification Service: Notification Permission Not Granted");
            return null;
        }
        
        var newId = Rng.Next();
        
        var notif = new NotificationRequest
        {
            NotificationId = newId,
            Title = title,
            Description = description,
            Schedule =
            {
                NotifyTime = time,
                RepeatType = NotificationRepeat.No
            }
        };

        try
        {
            await LocalNotificationCenter.Current.Show(notif);
            LoggerService.LogToFile($"Notification Service: {notif.NotificationId}:{notif.Title} set");
        }
        catch (Exception e)
        {
            LoggerService.LogToFile($"Notification Service: {e.Message}");
            throw;
        }
        
        return notif.NotificationId;
    }
    
    public static async Task<int> ScheduleNotification(NotificationRequest notif)
    {
        try
        {
            await LocalNotificationCenter.Current.Show(notif);
        }
        catch (Exception e)
        {
            LoggerService.LogToFile(e.Message);
            throw;
        }
        return notif.NotificationId;
    }

    public static async Task<bool> UpdateNotification(int notificationId, string? title = null,  string? description = null, DateTime? time = null)
    {
        var pendingNotifs = await LocalNotificationCenter.Current.GetPendingNotificationList();
        
        var notif = pendingNotifs.FirstOrDefault(n => n.NotificationId == notificationId);

        if (notif is null) return false;

        await CancelNotification(notif);
        
        notif.Title = title ?? notif.Title;
        notif.Description = description ?? notif.Description;
        notif.Schedule = new NotificationRequestSchedule()
        {
            NotifyTime = time ?? notif.Schedule.NotifyTime,
            RepeatType = NotificationRepeat.No
        };

        await ScheduleNotification(notif);
        return true;
    }

    public static async Task<bool> CancelNotification(int notificationId)
    {
        var pendingNotifs = await LocalNotificationCenter.Current.GetPendingNotificationList();
        
        var match = pendingNotifs.FirstOrDefault(n => n.NotificationId == notificationId);

        if (match is null) return false;

        LocalNotificationCenter.Current.Cancel(notificationId);
        
        return true;
    }
    
    public static async Task<bool> CancelNotification(NotificationRequest notif)
    {
        var pendingNotifs = await LocalNotificationCenter.Current.GetPendingNotificationList();

        if (pendingNotifs.Contains(notif))
        {
            notif.Cancel();
        }
        
        return true;
    }

    public static async Task<bool> DoesNotificationAlreadyExist(int notificationId)
    {
        var pendingNotifs = await LocalNotificationCenter.Current.GetPendingNotificationList();
        var match = pendingNotifs.FirstOrDefault(n => n.NotificationId == notificationId);
        
        return match is not null;
    }
}