using LiteCharms.Extensions;
using LiteCharms.Features.Quotes.Queries;
using LiteCharms.Infrastructure.Database;
using LiteCharms.Models;

namespace LiteCharms.Features.Quotes.Queries.Handlers;

public class GetCustomerQuotesQueryHandler(IDbContextFactory<ShopDbContext> contextFactory) : IRequestHandler<GetCustomerQuotesQuery, Result<Quote[]>>
{
    public async ValueTask<Result<Quote[]>> Handle(GetCustomerQuotesQuery request, CancellationToken cancellationToken)
    {
		try
		{
            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            if (!await context.Customers.AnyAsync(c => c.Id == request.CustomerId, cancellationToken))
                return Result.Fail<Quote[]>(new Error($"Customer with Id {request.CustomerId} does not exist."));

            var quotes = await context.Quotes.AsNoTracking()
                .Where(q => q.CustomerId == request.CustomerId).ToArrayAsync(cancellationToken);

            return quotes?.Length > 0
                ? Result.Ok(quotes.Select(q => q.ToModel()).ToArray())
                : Result.Fail<Quote[]>(new Error($"No quotes found for customer with Id {request.CustomerId}."));
        }
		catch (Exception ex)
		{
            return Result.Fail<Quote[]>(new Error(ex.Message).CausedBy(ex));
        }
    }
}