RandomSelector.h

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#pragma once

#include "tree/Selector.h"
#include "AI.h"

namespace ai {

class RandomSelector: public Selector {
public:
    SELECTOR_CLASS(RandomSelector)

    TreeNodeStatus execute(const AIPtr& entity, int64_t deltaMillis) override {
        if (Selector::execute(entity, deltaMillis) == CANNOTEXECUTE) {
            return CANNOTEXECUTE;
        }

        TreeNodes childrenShuffled = _children;
        const std::size_t size = childrenShuffled.size();
        ai::shuffle(childrenShuffled.begin(), childrenShuffled.end());
        TreeNodeStatus overallResult = FINISHED;
        std::size_t i;
        for (i = 0; i < size; ++i) {
            const TreeNodePtr& child = childrenShuffled[i];
            const TreeNodeStatus result = child->execute(entity, deltaMillis);
            if (result == RUNNING) {
                continue;
            } else if (result == CANNOTEXECUTE || result == FAILED) {
                overallResult = result;
            }
            child->resetState(entity);
        }
        for (++i; i < size; ++i) {
            childrenShuffled[i]->resetState(entity);
        }
        return state(entity, overallResult);
    }
};

}