#include "rule.h"

namespace domain {

Condition::Condition(std::string function, std::vector<Value> params, bool negated)
    : negated(negated), function(function), params(params)
{}

bool Condition::evaluate(RuleContext &context) {
    std::vector<Value> request;
    for(uint i=0; i<params.size(); i++) {
        if(params[i].isType(Value::ATTRIBUTE_REFERENCE)) {
            request.push_back(context.attributes[params[i].asReference()]);
        } else {
            request.push_back(params[i]);
        }
    }
    bool result = context.function[function](request);
    return negated ? !result : result;
}


Action::Action(ActionType type, std::string message)
    : type(type), message(message)
{}

Action::ActionType Action::getType() {
    return type;
}
std::string Action::getMessage() {
    return message;
}


IfStatement::IfStatement(Condition condition, Action action)
    : condition(condition), action(action)
{}

std::optional<Action> IfStatement::evaluate(RuleContext &context) {
    if(condition.evaluate(context)) {
        return action;
    }
    return std::nullopt;
}

Rule::Rule(std::vector<IfStatement> statements)
    : statements(statements)
{}

std::optional<Action> Rule::evaluate(RuleContext &context) {
    for(uint i=0; i<statements.size(); i++) {
        auto response = statements[i].evaluate(context);
        if(response) {
            return response;
        }
    }
    return std::nullopt;
}

} // namespace domain