SettlementRules.h

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#pragma once
 
#include "settlement/Settlement.h"
 
#include <cstdint>
#include <functional>
#include <string>
#include <vector>
 
namespace eve::effects {
class EffectContainer;
}
 
namespace eve::settlement {
 
enum class RuleOperation : std::uint8_t {
    Add,
    Multiply,
    ResistFlat,
    ResistPercent,
    AbsorbFlat,
    ClampMaximum,
    Critical,
    Immune,
    Lifesteal,
    Reflect,
};
 
struct EVENGINE_API_FOUNDATION RuleFilter {
    std::vector<std::string> kinds;
    std::vector<std::string> requiredTags;
    std::vector<std::string> excludedTags;
};
 
struct EVENGINE_API_FOUNDATION SettlementRule {
    std::string   id;
    std::string   source;
    StageKind     stage              = StageKind::SourceModifiers;
    int           priority           = 0;
    RuleOperation operation          = RuleOperation::Add;
    double        value              = 0.0;
    double        valuePerExtraStack = 0.0;
    std::uint32_t stacks             = 1;
    RuleFilter    filter;
    std::string when;
};
 
class EVENGINE_API_FOUNDATION SettlementRuleSet {
public:
    [[nodiscard]] static constexpr std::uint32_t schemaVersion() noexcept { return 1; }
 
    [[nodiscard]] eve::Result<void> configure(std::vector<SettlementRule> rules);
 
    [[nodiscard]] static eve::Result<SettlementRuleSet> fromJson(std::string_view json);
 
    [[nodiscard]] eve::Result<void> configureJson(std::string_view json);
 
    [[nodiscard]] eve::Result<void> install(SettlementPipeline& pipeline) const;
 
    [[nodiscard]] std::size_t size() const noexcept { return rules_.size(); }
 
    [[nodiscard]] eve::Result<std::string> canonicalJson() const;
 
    [[nodiscard]] eve::Result<eve::ContentId> digest(const eve::SnapshotHashProvider& hashProvider) const;
 
private:
    using ConditionFunction = std::function<eve::Result<bool>(const SettlementRequest&)>;
 
    std::vector<SettlementRule>    rules_;
    std::vector<ConditionFunction> conditions_;
    std::vector<std::string>       conditionDigests_;
};
 
[[nodiscard]] EVENGINE_API_FOUNDATION eve::Result<SettlementRuleSet> projectEffectRules(
    const effects::EffectContainer& effects, std::string_view scope);
 
}  // namespace eve::settlement