ACA： Automatic Construction Assistant

ACA: Automatic Construction Assistant

Enable It Once—National Construction Becomes Fully Automatic

After selecting a construction mode, you no longer need to choose states, calculate infrastructure returns, add buildings, or refill the construction queue manually.

ACA automatically checks every eligible core state, reads construction modifiers, building slots, and infrastructure, selects suitable construction plans, and refills the queue whenever a building is completed.

This mod is based on “OGAS: Industrial Construction Planner” and adds fully automated construction and queue management to its planning system.

Three Automatic Construction Modes

• Long-Term Civilian Planning: 1000 Days Plans around cumulative usable civilian-factory days over the next 1000 days. It also projects building slots from the next two industry-technology tiers.

• Short-Term Civilian Planning: 180 Days Uses only currently available building slots, prioritizes rapid output over the next six months, and constructs civilian factories only.

• Military Mode Evaluates national, technology, state, dam, existing-infrastructure, and building-specific construction modifiers, then selects states where military factories can be built faster. Military Mode constructs military factories directly and never upgrades infrastructure.

Long-Term Civilian Planning Algorithm

ACA compares the following options for every eligible state:

• Construct civilian factories immediately.

• Upgrade one or more infrastructure levels before constructing civilian factories.

• Evaluate every feasible route from the current infrastructure level through level 5.

Long-Term Mode projects future building slots from the next two industry-technology tiers:

• Below industry tier 4, ACA projects up to two additional technology tiers.

• At industry tier 4, ACA projects only the final tier.

• At industry tier 5, no additional slots are projected.

• Factories requiring projected slots are not queued until those slots actually unlock.

Every route includes:

• Construction speed from national modifiers, technologies, economic laws, and building-specific bonuses.

• State construction speed, dams, and other state modifiers.

• Construction bonuses provided by existing infrastructure.

• The construction time required for every infrastructure upgrade.

• The delayed completion of the first civilian factories caused by infrastructure investment.

• Currently available slots and slots projected from two additional industry-technology tiers.

• Cumulative usable civilian-factory days produced by every completed factory within 1000 days.

• The minimum number of civilian factories required for the infrastructure route to outperform direct construction.

ACA selects an infrastructure route only when it produces more cumulative value within 1000 days than constructing civilian factories directly for the entire period.

Infrastructure Cannot Consume the Entire Country

ACA limits the number of infrastructure projects under construction at the same time:

• Infrastructure may occupy no more than roughly one third of national construction lines.

• At least one construction line is always reserved for factories.

• Countries with only one construction line will not construct infrastructure.

• Even when several states have profitable infrastructure routes, ACA selects only the highest-ranked routes that fit within the infrastructure-line limit.

This allows large countries to make profitable long-term infrastructure investments without causing the entire national construction workforce to stop building factories.

Fully Automatic Operation

• Immediately performs a complete national plan when a mode is enabled.

• Checks construction capacity every day and immediately fills available vacancies.

• Reloads national modifiers, building slots, infrastructure, and territorial conditions every 30 days.

• The total ACA queue is capped at “the number of construction lines + 1 reserve building.”

• The reserve building uses the same national optimization algorithm.

• Provides a “Recalculate Everything Now” decision.

Mode Switching and Deleted-Construction Recovery

Long-Term Civilian, Short-Term Civilian, and Military modes can be changed at any time.

When switching modes, ACA releases the previous mode’s tracking, immediately recalculates the national plan, and fills the queue with buildings from the newly selected mode. HOI4 scripts cannot automatically remove buildings already present in the construction queue, so existing projects will continue normally.

If you manually delete a building queued by ACA, use:

“Recover After Deleted Construction”

This decision clears invalid tracking, preserves the current construction mode, and immediately recalculates and refills the queue.

State Infrastructure Controls

Automatic infrastructure construction is allowed in every state by default.

• Green road icon: automatic infrastructure construction is allowed.

• Red forbidden icon: automatic infrastructure construction is disabled.

States with infrastructure construction disabled remain eligible for automatic factory construction. Bonuses from their existing infrastructure are still included in state scoring.