Production Line
========================

.. code-block:: csharp

  public sealed class ProductionLine

Unlike the other pages in this partition, ``ProductionLine`` is not a unit module itself (it does not implement ``IUnitModule``) — it is a plain helper object owned by the **Production** module.

Every entry of a unit's **Production Categories** list gets its own ``ProductionLine`` instance, which tracks that category's build queue and build progress independently from the other lines.

**Main members**

``Category`` - the ``ProductionCategoryData`` this line was created for.

``UnitsQueue`` - the list of ``UnitData`` currently queued to be built by this line, in build order.

``TimeToBuildCurrentUnit`` - remaining build time (in seconds) for the unit currently at the front of the queue.

``AvailableUnits`` - shortcut to ``Category.AvailableUnits``, the list of unit types this line is allowed to build.

**Main methods**

``AddUnitToQueue(UnitData, Player)`` - adds a unit to the queue and spends the owner player's resources, if they can afford it.

``TryCancelUnitProducing(UnitData)`` / ``RemoveUnitFromQueue(UnitData)`` - removes a unit from the queue. Prefer ``TryCancelUnitProducing``, which also refunds the spent resources; ``RemoveUnitFromQueue`` is for advanced usage only.

``FinishProduce()`` - finishes production of the unit at the front of the queue.

``GetBuildProgressPercents()`` - returns the current build progress of the front unit in the queue, from 0 to 1.

``IsUnitTypeProducingNow(UnitData)`` / ``IsUnitTypeInQueue(UnitData)`` / ``IsUnitReady()`` - convenience checks for the current queue state.

You normally don't create a ``ProductionLine`` yourself — the **Production** module creates one line per production category automatically. You can access existing lines through ``Production.Lines`` or ``Production.TryGetLine(category, out line)``.