using Distribution.Infra.UoW;

namespace Distribution.Features.Uom;

public class UomService(IUomRepository repo, IUnitOfWork uow)
{
    public async Task<List<UomResponse>> GetAllAsync() =>
        (await repo.GetAllAsync())
            .Where(u => u.IsActive)
            .Select(u => new UomResponse(u.Id, u.Name, u.IsActive, u.CreatedAt))
            .ToList();

    public async Task<UomResponse?> GetByIdAsync(Guid id)
    {
        var uom = await repo.GetByIdAsync(id);
        if (uom is null || !uom.IsActive) return null;
        return new UomResponse(uom.Id, uom.Name, uom.IsActive, uom.CreatedAt);
    }

    public async Task<UomResponse> CreateAsync(CreateUomRequest request, CancellationToken ct = default)
    {
        var uom = new Models.Uom { Name = request.Name };
        await uow.BeginAsync(ct);
        try { await repo.AddAsync(uom); await uow.CommitAsync(ct); }
        catch { await uow.RollbackAsync(ct); throw; }
        return new UomResponse(uom.Id, uom.Name, uom.IsActive, uom.CreatedAt);
    }

    public async Task<UomResponse?> UpdateAsync(Guid id, UpdateUomRequest request, CancellationToken ct = default)
    {
        var uom = await repo.GetByIdAsync(id);
        if (uom is null || !uom.IsActive) return null;
        if (uom.ExternalErpId.HasValue) return null;
        uom.Name = request.Name;
        await uow.BeginAsync(ct);
        try { repo.Update(uom); await uow.CommitAsync(ct); }
        catch { await uow.RollbackAsync(ct); throw; }
        return new UomResponse(uom.Id, uom.Name, uom.IsActive, uom.CreatedAt);
    }

    public async Task<bool> DeleteAsync(Guid id, CancellationToken ct = default)
    {
        var uom = await repo.GetByIdAsync(id);
        if (uom is null || !uom.IsActive) return false;
        if (uom.ExternalErpId.HasValue) return false;
        if (await repo.IsUsedByItemsAsync(id)) return false;
        await uow.BeginAsync(ct);
        try { repo.Remove(uom); await uow.CommitAsync(ct); }
        catch { await uow.RollbackAsync(ct); throw; }
        return true;
    }
}