economy.h

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/* Conquer Space
 * Copyright (C) 2021-2025 Conquer Space
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
#pragma once
 
#include <map>
#include <set>
#include <string>
#include <vector>
 
#include <entt/entt.hpp>
 
#include "common/components/resource.h"
 
namespace cqsp::common::components {
struct MarketInformation {
 private:
    // I forgot why we have 2 separate ledgers for supply and demand
    ResourceLedger _demand;
    ResourceLedger _supply;
    ResourceLedger _previous_demand;
    ResourceLedger _previous_supply;
    bool current = true;
 
 public:
    ResourceLedger sd_ratio;
 
    ResourceLedger volume;
    ResourceLedger price;
 
    // Supply that existed, but not fufilled last time
    // Surplus supply
    ResourceLedger latent_supply;
    // Demand that existed, but was not fufilled the last time
    // Surplus demand
    ResourceLedger last_latent_demand;
    ResourceLedger latent_demand;
    ResourceLedger supply_difference;
 
    ResourceLedger chronic_shortages;
 
    ResourceLedger trade;
    ResourceLedger delta;
 
    ResourceLedger production;
    ResourceLedger consumption;
 
    // PID controller
    ResourceLedger sd_integral;
 
    void ResetLedgers() {
        // Reset the ledger values
        current = !current;
        demand().clear();
        supply().clear();
    }
 
    ResourceLedger& supply() {
        if (current) {
            return _supply;
        } else {
            return _previous_supply;
        }
    }
    ResourceLedger& demand() {
        if (current) {
            return _demand;
        } else {
            return _previous_demand;
        }
    }
 
    ResourceLedger& previous_supply() {
        if (current) {
            return _previous_supply;
        } else {
            return _supply;
        }
    }
 
    ResourceLedger& previous_demand() {
        if (current) {
            return _previous_demand;
        } else {
            return _demand;
        }
    }
};
 
struct MarketElementInformation {
    // Sum of the resources traded last time.
    double supply;
    double demand;
    double price;
    double price_ratio;
    double sd_ratio;
    double inputratio;
};
 
struct PlanetaryMarket {
    std::vector<entt::entity> participants;  // The markets that are connected
};
 
struct Market : MarketInformation {
    std::vector<MarketInformation> history;
 
    std::map<entt::entity, MarketElementInformation> market_information;
    std::map<entt::entity, MarketElementInformation> last_market_information;
 
    std::set<entt::entity> participants;
    // std::vector<std::pair<entt::entity, entt::entity>> neighbors;
    entt::basic_sparse_set<entt::entity> connected_markets;
 
    double GDP = 0;
 
    // Math
    void AddSupply(const ResourceLedger& stockpile);
    void AddSupply(const ResourceLedger& stockpile, double multiplier);
    void AddDemand(const ResourceLedger& stockpile);
    void AddDemand(const ResourceLedger& stockpile, double multiplier);
 
    double GetPrice(const ResourceLedger& stockpile);
    double GetPrice(const entt::entity& good);
    double GetSDRatio(const entt::entity& good);
    double GetSupply(const entt::entity& good);
    double GetDemand(const entt::entity& good);
 
    void AddParticipant(entt::entity participant) { participants.insert(participant); }
 
    MarketElementInformation& operator[](entt::entity ent) { return market_information[ent]; }
 
    auto begin() { return market_information.begin(); }
 
    auto end() { return market_information.end(); }
};
 
struct Price {
    double price;
 
    operator double() { return price; }
};
 
struct Currency {};
 
struct CostTable : public ResourceLedger {};
 
// TODO(EhWhoAmI): Add multiple currency support
struct Wallet {
    Wallet() = default;
    Wallet(entt::entity _currency, double _balance) : balance(_balance), currency(_currency) {}
 
    Wallet& operator+=(const double amount) {
        this->balance += amount;
        change += amount;
        return *this;
    }
    Wallet& operator-=(const double amount) {
        this->balance -= amount;
        change -= amount;
        GDP_change += amount;
        // Record the money delta since last reset
        return *this;
    }
 
    // Basic multiplication that logs the change
    // TODO(EhWhoAmI): Make sure this is correct
    Wallet& operator*=(const double coefficent) {
        double newbalance = this->balance * coefficent;
        double change = newbalance - this->balance;
        if (change > 0) {
            *this += change;
        } else if (change < 0) {
            *this -= change * -1;
        }
        return *this;
    }
 
    operator double() const { return balance; }
 
    Wallet& operator=(double _balance) {
        change += (_balance - balance);
        if ((_balance - balance) < 0) {
            GDP_change += _balance - balance;
        }
        balance = _balance;
        return *this;
    }
 
    double GetBalance() const { return balance; }
 
    double GetChange() const { return change; }
 
    void Reset() {
        change = 0;
        GDP_change = 0;
    }
    double GetGDPChange() { return GDP_change; }
 
 private:
    double balance = 0;
    double change = 0;
    // Only records when spending money, so when money decreases
    double GDP_change = 0;
    entt::entity currency;
};
 
struct MarketAgent {
    entt::entity market;
};
 
struct MarketCenter {
    entt::entity market;
};
 
// This trade node has international connections
// For space connections, the spaceport struct exists
struct InternationalPort {};
 
struct Commercial {
    entt::entity city;
    int size;
};
 
// Something that hires people, and will pay the people
struct Employer {
    int population_needed;
    int population_fufilled;
    entt::entity segment;
};
 
struct LaborInformation {
    int working_population;
    int employed_population;
};
 
struct FactoryProducing {};
 
// This facility is bankrolled by something else, so if they run out of money
// they can go to this wallet to ask for cash?
struct Owned {
    entt::entity owner;
};
 
struct TradePartners : std::vector<entt::entity> {};
}  // namespace cqsp::common::components