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

namespace LiteCharms.Features.Customers.Queries.Handlers;

public class GetCustomersQueryHandler(IDbContextFactory<LeadGeneratorDbContext> contextFactory) : IRequestHandler<GetCustomersQuery, Result<Customer[]>>
{
    public async ValueTask<Result<Customer[]>> Handle(GetCustomersQuery 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 customers = await context.Customers.AsNoTracking()
                .OrderByDescending(o => o.CreatedAt)
                .Where(c => c.CreatedAt >= fromDate && c.CreatedAt <= toDate)
                .ToArrayAsync(cancellationToken);

            return customers?.Length > 0
                ? Result.Ok(customers.Select(c => c.ToModel()).ToArray())
                : Result.Fail<Customer[]>(new Error("No customers found in the specified date range."));
        }
		catch (Exception ex)
		{
            return Result.Fail<Customer[]>(new Error(ex.Message).CausedBy(ex));
        }
    }
}