contracts & client config: scale building cost (#1722)

* contracts & client config: scale building cost

* contracts: use quadratic formula for scaling building cost

* contract: function rename

config/index.ts

@@ -6,6 +6,7 @@ import {
   setBattleConfig,
   setBuildingCategoryPopConfig,
   setBuildingConfig,
+  setBuildingGeneralConfig,
   setCapacityConfig,
   setCombatConfig,
   setHyperstructureConfig,
@@ -57,6 +58,7 @@ await setBuildingCategoryPopConfig(account, provider);
 await setPopulationConfig(account, provider);
 await setBuildingConfig(account, provider);
 await setResourceBuildingConfig(account, provider);
+await setBuildingGeneralConfig(account, provider);
 await setWeightConfig(account, provider);
 await setCombatConfig(account, provider);
 await setBattleConfig(account, provider);

contracts/scripts/system_models.json

@@ -13,6 +13,7 @@
     "BankConfig",
     "TroopConfig",
     "BuildingConfig",
+    "BuildingGeneralConfig",
     "BuildingCategoryPopConfig",
     "PopulationConfig",
     "HyperstructureResourceConfig",

contracts/src/models/buildings.cairo

@@ -2,10 +2,10 @@ use core::poseidon::poseidon_hash_span;
 use core::zeroable::Zeroable;
 use dojo::world::{IWorldDispatcher, IWorldDispatcherTrait};
 use eternum::alias::ID;
-use eternum::constants::{ResourceTypes, POPULATION_CONFIG_ID};
+use eternum::constants::{ResourceTypes, POPULATION_CONFIG_ID, WORLD_CONFIG_ID};
 use eternum::models::config::{
     TickConfig, TickImpl, TickTrait, ProductionConfig, BuildingConfig, BuildingConfigCustomImpl,
-    BuildingCategoryPopConfigCustomTrait, PopulationConfig
+    BuildingCategoryPopConfigCustomTrait, PopulationConfig, BuildingGeneralConfig
 };
 use eternum::models::owner::{EntityOwner, EntityOwnerCustomTrait};
 use eternum::models::population::{Population, PopulationCustomTrait};
@@ -15,6 +15,7 @@ use eternum::models::production::{
 };
 use eternum::models::resources::ResourceCustomTrait;
 use eternum::models::resources::{Resource, ResourceCustomImpl, ResourceCost};
+use eternum::utils::math::{PercentageImpl, PercentageValueImpl};
 
 //todo we need to define border of innner hexes
 
@@ -88,22 +89,6 @@ impl BuildingCategoryIntoFelt252 of Into<BuildingCategory, felt252> {
 }
 
 
-#[generate_trait]
-impl BonusPercentageImpl of BonusPercentageTrait {
-    fn _1() -> u128 {
-        100
-    }
-
-    fn _10() -> u128 {
-        1_000
-    }
-
-    fn _100() -> u128 {
-        10_000
-    }
-}
-
-
 #[generate_trait]
 impl BuildingProductionCustomImpl of BuildingProductionCustomTrait {
     fn is_resource_producer(self: Building) -> bool {
@@ -138,7 +123,7 @@ impl BuildingProductionCustomImpl of BuildingProductionCustomTrait {
             BuildingCategory::None => 0,
             BuildingCategory::Castle => 0,
             BuildingCategory::Resource => 0,
-            BuildingCategory::Farm => BonusPercentageImpl::_10().try_into().unwrap(), // 10%
+            BuildingCategory::Farm => PercentageValueImpl::_10().try_into().unwrap(), // 10%
             BuildingCategory::FishingVillage => 0,
             BuildingCategory::Barracks => 0,
             BuildingCategory::Market => 0,
@@ -293,7 +278,7 @@ impl BuildingProductionCustomImpl of BuildingProductionCustomTrait {
         let production_config: ProductionConfig = get!(world, produced_resource_type, ProductionConfig);
 
         let bonus_amount: u128 = (production_config.amount * (*self.bonus_percent).into())
-            / BonusPercentageImpl::_100();
+            / PercentageValueImpl::_100().into();
 
         production_config.amount + bonus_amount
     }
@@ -428,7 +413,7 @@ impl BuildingCustomImpl of BuildingCustomTrait {
         category: BuildingCategory,
         produce_resource_type: Option<u8>,
         inner_coord: Coord
-    ) -> Building {
+    ) -> (Building, BuildingQuantityv2) {
         // check that the entity has a position
         let outer_entity_position = get!(world, outer_entity_id, Position);
         outer_entity_position.assert_not_zero();
@@ -488,7 +473,7 @@ impl BuildingCustomImpl of BuildingCustomTrait {
         // set population
         set!(world, (population));
 
-        building
+        (building, building_quantity)
     }
 
     /// Pause building production without removing the building
@@ -598,17 +583,33 @@ impl BuildingCustomImpl of BuildingCustomTrait {
         destroyed_building_category
     }
 
-    fn make_payment(world: IWorldDispatcher, entity_id: ID, category: BuildingCategory, resource_type: u8) {
-        let building_config: BuildingConfig = BuildingConfigCustomImpl::get(world, category, resource_type);
+    fn make_payment(self: Building, building_quantity: BuildingQuantityv2, world: IWorldDispatcher) {
+        let building_general_config: BuildingGeneralConfig = get!(world, WORLD_CONFIG_ID, BuildingGeneralConfig);
+        let building_config: BuildingConfig = BuildingConfigCustomImpl::get(
+            world, self.category, self.produced_resource_type
+        );
         let mut index = 0;
         loop {
             if index == building_config.resource_cost_count {
                 break;
             }
 
+            // calculate cost of building based on the formula:
+            // Cost = Base + (Base * Rate * (N - 1)²)
+            // Where:
+            //  Base = The cost of the first building
+            //  Rate = How quickly the cost goes up (a small number like 0.1 or 0.2)
+            //  N = Which number building this is (1st, 2nd, 3rd, etc.)
+            //
             let resource_cost: ResourceCost = get!(world, (building_config.resource_cost_id, index), ResourceCost);
-            let mut resource = ResourceCustomImpl::get(world, (entity_id, resource_cost.resource_type));
-            resource.burn(resource_cost.amount);
+            let mut resource = ResourceCustomImpl::get(world, (self.outer_entity_id, resource_cost.resource_type));
+            let percentage_additional_cost = PercentageImpl::get(
+                resource_cost.amount, building_general_config.base_cost_percent_increase.into()
+            );
+            let scale_factor = building_quantity.value - 1;
+            let total_cost = resource_cost.amount
+                + (scale_factor.into() * scale_factor.into() * percentage_additional_cost);
+            resource.burn(total_cost);
             resource.save(world);
             index += 1;
         };

contracts/src/models/config.cairo

@@ -344,6 +344,15 @@ pub struct BankConfig {
     lp_fee_denom: u128,
 }
 
+#[derive(Copy, Drop, Serde)]
+#[dojo::model]
+pub struct BuildingGeneralConfig {
+    #[key]
+    config_id: ID,
+    base_cost_percent_increase: u16,
+}
+
+
 #[derive(Copy, Drop, Serde)]
 #[dojo::model]
 pub struct BuildingConfig {

contracts/src/systems/buildings/contracts.cairo

@@ -53,14 +53,12 @@ mod building_systems {
             get!(world, entity_id, EntityOwner).assert_caller_owner(world);
 
             // todo: check that entity is a realm
-            let building: Building = BuildingCustomImpl::create(
+            let (building, building_quantity) = BuildingCustomImpl::create(
                 world, entity_id, building_category, produce_resource_type, building_coord
             );
 
-            // make payment for building
-            BuildingCustomImpl::make_payment(
-                world, building.outer_entity_id, building.category, building.produced_resource_type
-            );
+            // pay one time cost of the building
+            building.make_payment(building_quantity, world);
         }
         fn pause_production(ref world: IWorldDispatcher, entity_id: ID, building_coord: Coord) {
             BuildingCustomImpl::pause_production(world, entity_id, building_coord);

contracts/src/systems/config/contracts.cairo

@@ -107,6 +107,7 @@ trait ITroopConfig {
 
 #[dojo::interface]
 trait IBuildingConfig {
+    fn set_building_general_config(ref world: IWorldDispatcher, base_cost_percent_increase: u16);
     fn set_building_config(
         ref world: IWorldDispatcher,
         building_category: BuildingCategory,
@@ -149,7 +150,7 @@ mod config_systems {
         CapacityConfig, SpeedConfig, WeightConfig, WorldConfig, LevelingConfig, RealmFreeMintConfig, MapConfig,
         TickConfig, ProductionConfig, BankConfig, TroopConfig, BuildingConfig, BuildingCategoryPopConfig,
         PopulationConfig, HyperstructureResourceConfig, HyperstructureConfig, StaminaConfig, StaminaRefillConfig,
-        MercenariesConfig, BattleConfig, TravelStaminaCostConfig
+        MercenariesConfig, BattleConfig, TravelStaminaCostConfig, BuildingGeneralConfig
     };
 
     use eternum::models::position::{Position, PositionCustomTrait, Coord};
@@ -528,6 +529,12 @@ mod config_systems {
 
     #[abi(embed_v0)]
     impl BuildingConfigCustomImpl of super::IBuildingConfig<ContractState> {
+        fn set_building_general_config(ref world: IWorldDispatcher, base_cost_percent_increase: u16) {
+            assert_caller_is_admin(world);
+
+            set!(world, BuildingGeneralConfig { config_id: WORLD_CONFIG_ID, base_cost_percent_increase });
+        }
+
         fn set_building_config(
             ref world: IWorldDispatcher,
             building_category: BuildingCategory,

sdk/packages/eternum/src/config/index.ts

@@ -3,6 +3,7 @@ import {
   ARMY_ENTITY_TYPE,
   BASE_POPULATION_CAPACITY,
   BUILDING_CAPACITY,
+  BUILDING_FIXED_COST_SCALE_PERCENT,
   BUILDING_POPULATION,
   BUILDING_RESOURCE_PRODUCED,
   DONKEY_ENTITY_TYPE,
@@ -72,6 +73,15 @@ export const setBuildingCategoryPopConfig = async (account: Account, provider: E
   console.log(`Configuring building category population ${tx.statusReceipt}...`);
 };
 
+export const setBuildingGeneralConfig = async (account: Account, provider: EternumProvider) => {
+  const tx = await provider.set_building_general_config({
+    signer: account,
+    base_cost_percent_increase: BUILDING_FIXED_COST_SCALE_PERCENT,
+  });
+
+  console.log(`Configuring building general config ${tx.statusReceipt}...`);
+};
+
 export const setPopulationConfig = async (account: Account, provider: EternumProvider) => {
   const tx = await provider.set_population_config({
     signer: account,

sdk/packages/eternum/src/constants/global.ts

@@ -102,7 +102,7 @@ export const ONE_MONTH = 2628000;
 
 // Buildings
 export const BASE_POPULATION_CAPACITY = 5;
-
+export const BUILDING_FIXED_COST_SCALE_PERCENT = 5_000; // 5_000/10_000 = 50%
 // Points
 export const HYPERSTRUCTURE_POINTS_PER_CYCLE = 10;
 export const HYPERSTRUCTURE_POINTS_ON_COMPLETION = 2_000_000; // about the amount of points generated by the structure in 2 days

sdk/packages/eternum/src/provider/index.ts

@@ -878,6 +878,16 @@ export class EternumProvider extends EnhancedDojoProvider {
     );
   }
 
+  public async set_building_general_config(props: SystemProps.SetBuildingGeneralConfigProps) {
+    const { base_cost_percent_increase, signer } = props;
+
+    return await this.executeAndCheckTransaction(signer, {
+      contractAddress: getContractByName(this.manifest, `${NAMESPACE}-config_systems`),
+      entrypoint: "set_building_general_config",
+      calldata: [base_cost_percent_increase],
+    });
+  }
+
   public async set_population_config(props: SystemProps.SetPopulationConfigProps) {
     const { base_population, signer } = props;
 

sdk/packages/eternum/src/types/provider.ts

@@ -444,6 +444,10 @@ export interface SetBuildingCategoryPopConfigProps extends SystemSigner {
   calls: { building_category: BuildingType; population: num.BigNumberish; capacity: num.BigNumberish }[];
 }
 
+export interface SetBuildingGeneralConfigProps extends SystemSigner {
+  base_cost_percent_increase: num.BigNumberish;
+}
+
 export interface SetPopulationConfigProps extends SystemSigner {
   base_population: num.BigNumberish;
 }