components/LiteCharms.Features/Shop/Customers/CustomerService.cs

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

namespace LiteCharms.Features.Shop.Customers;

public class CustomerService(IDbContextFactory<ShopDbContext> contextFactory)
{
    public async ValueTask<Result<Guid>> CreateCustomerAsync(CreateCustomer request, CancellationToken cancellationToken = default)
    {
        try
        {
            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var customerEmail = request.Email.ToLower().Trim();

            if (await context.Customers.AnyAsync(c => c.Email == customerEmail, cancellationToken))
                return Result.Fail<Guid>(new Error($"A customer with the email {customerEmail} already exists"));

            var newCustomer = context.Customers.Add(new Entities.Customer
            {
                Company = request.Company,
                Name = request.Name,
                LastName = request.LastName,
                Tax = request.Tax,
                Email = customerEmail,
                Discord = request.Discord,
                Slack = request.Slack,
                LinkedIn = request.LinkedIn,
                Whatsapp = request.Whatsapp,
                Website = request.Website,
                Phone = request.Phone,
                Address = request.Address,
                City = request.City,
                Region = request.Region,
                Country = request.Country,
                PostalCode = request.PostalCode,
                Active = true,
            });

            return await context.SaveChangesAsync(cancellationToken) > 0
                ? Result.Ok(newCustomer.Entity.Id)
                : Result.Fail<Guid>(new Error($"Failed to create customer {customerEmail}"));
        }
        catch (Exception ex)
        {
            return Result.Fail<Guid>(new Error(ex.Message).CausedBy(ex));
        }
    }

    public async ValueTask<Result<Customer>> GetCustomerAsync(Guid customerId, CancellationToken cancellationToken = default)
    {
        try
        {
            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var customer = await context.Customers.FirstOrDefaultAsync(c => c.Id == customerId, cancellationToken);

            return customer is not null
                ? Result.Ok(customer.ToModel())
                : Result.Fail<Customer>($"Customer not found with id {customerId}");
        }
        catch (Exception ex)
        {
            return Result.Fail<Customer>(new Error(ex.Message).CausedBy(ex));
        }
    }

    public async ValueTask<Result<Customer[]>> GetCustomersAsync(DateRange range, CancellationToken cancellationToken = default)
    {
        try
        {
            var fromDate = range.From.ToDateTime(TimeOnly.MinValue);
            var toDate = range.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)
                .Take(range.MaxRecords)
                .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));
        }
    }

    public async ValueTask<Result> UpdateCustomerAsync(UpdateCustomer request, CancellationToken cancellationToken = default)
    {
        try
        {
            using var context = await contextFactory.CreateDbContextAsync(cancellationToken);

            var customer = await context.Customers.FirstOrDefaultAsync(c => c.Id == request.CustomerId, cancellationToken);

            if (customer is null)
                return Result.Fail(new Error($"Customer with ID {request.CustomerId} not found."));

            customer.Name = request.Name;
            customer.LastName = request.LastName;
            customer.Email = request.Email;
            customer.Company = request.Company;
            customer.Address = request.Address;
            customer.City = request.City;
            customer.Region = request.Region;
            customer.Country = request.Country;
            customer.PostalCode = request.PostalCode;
            customer.Phone = request.Phone;
            customer.Tax = request.Tax;
            customer.City = request.City;
            customer.Discord = request.Discord;
            customer.Slack = request.Slack;
            customer.LinkedIn = request.LinkedIn;
            customer.Whatsapp = request.Whatsapp;

            return await context.SaveChangesAsync(cancellationToken) > 0
                ? Result.Ok()
                : Result.Fail(new Error($"Failed to update the customer {request.CustomerId}."));
        }
        catch (Exception ex)
        {
            return Result.Fail(new Error(ex.Message).CausedBy(ex));
        }
    }
}