using LiteCharms.Extensions;
using LiteCharms.Infrastructure.Database;
using LiteCharms.Models;

namespace LiteCharms.Features.Leads.Queries.Handlers;

public class GetLeadsQueryHandler(IDbContextFactory<ShopDbContext> contextFactory) : IRequestHandler<GetLeadsQuery, Result<Lead[]>>
{
    public async ValueTask<Result<Lead[]>> Handle(GetLeadsQuery 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 leads = await context.Leads.AsNoTracking()
                .OrderByDescending(o => o.CreatedAt)
                .Where(l => l.CreatedAt.Date >= fromDate && l.CreatedAt.Date <= toDate)
                .Take(request.MaxRecords)
                .ToArrayAsync(cancellationToken);

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