#ifndef STATICQUEUE_H
#define STATICQUEUE_H

#include "Exception.h"
#include "Queue.h"

namespace Kylin {
template <typename T, size_t N>
class StaticQueue : public Queue<T> {
public:
    T &head() override {
        if (m_size <= 0) THROW_EXCEPTION(InvalidParameterException, "There is no element in queue...");
        return m_space[m_front];
    }

    void enqueue(const T &value) override {
        if (m_size >= N) THROW_EXCEPTION(InvalidParameterException, "There is no space...");
        m_space[m_rear] = value;
        m_rear = (m_rear + 1) % N;
        m_size++;
    }

    T dequeue() override {
        if (m_size <= 0) THROW_EXCEPTION(InvalidParameterException, "There is no element in queue...");
        auto result = m_space[m_front];
        m_front = (m_front + 1) % N;
        m_size--;
        return result;
    }

    virtual void clear() {
        m_front = 0;
        m_rear = 0;
        m_size = 0;
    }

    size_t size() const noexcept override { return m_size; }

    size_t capacity() const { return N; }

private:
    T m_space[N];
    size_t m_front = 0;
    size_t m_rear = 0;
    size_t m_size = 0;
};
} // namespace Kylin
#endif // STATICQUEUE_H