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

namespace LiteCharms.Features.Leads.Queries.Handlers;

public class GetCustomerLeadsQueryHandler(IDbContextFactory<ShopDbContext> contextFactory) : IRequestHandler<GetCustomerLeadsQuery, Result<Lead[]>>
{
    public async ValueTask<Result<Lead[]>> Handle(GetCustomerLeadsQuery 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(lead => lead.CustomerId == request.CustomerId)
                .Where(lead => lead.CreatedAt.Date >= fromDate && lead.CreatedAt.Date <= toDate)
                .ToArrayAsync(cancellationToken);

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