using LiteCharms.Extensions;
using LiteCharms.Features.Shop.Notifications.Models;
using LiteCharms.Features.Shop.Postgres;

namespace LiteCharms.Features.Notifications.Queries.Handlers;

public class GetNotificationsQueryHandler(IDbContextFactory<ShopDbContext> contextFactory) : IRequestHandler<GetNotificationsQuery, Result<Notification[]>>
{
    public async ValueTask<Result<Notification[]>> Handle(GetNotificationsQuery request, CancellationToken cancellationToken)
    {
		try
		{
            var fromDate = request.From.ToDateTime(TimeOnly.MinValue);
            var toDate = request.To.ToDateTime(TimeOnly.MaxValue);

            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var notifications = await context.Notifications.AsNoTracking()
                .Where(n => n.CreatedAt >= fromDate && n.CreatedAt <= toDate)
                .OrderByDescending(n => n.CreatedAt)
                .Take(request.MaxRecords)
                .ToArrayAsync(cancellationToken);

            return notifications?.Length > 0 
                ? Result.Ok(notifications.Select(n => n.ToModel()).ToArray()) 
                : Result.Fail(new Error($"No notifications found for the specified date range {request.From} to {request.To}."));
        }
		catch (Exception ex)
		{
            return Result.Fail(new Error(ex.Message).CausedBy(ex));
        }
    }
}