#ifndef VECTOR_H
#define VECTOR_H

#include "core/error_macros.h"

template <class T>
class Vector {

public:
	void push_back(const T &element);
	void pop_back();
	void remove(const int index);
	void remove_keep_order(const int index);
	void erase(const T &element);
	void clear();
	bool empty() const;
	T get(const int index);
	const T &get(const int index) const;
	void set(const int index, const T &value);
	void swap(const int index1, const int index2);

	void sort_inc();
	void sort_dec();

	int size() const;
	int capacity() const;
	void ensure_capacity(const int capacity);
	void resize(const int s);
	void append_array(const Vector<T> &other);
	int find(const T &val) const;

	T *dataw();
	const T *data() const;

	const T &operator[](const int index) const;
	T &operator[](const int index);

	Vector();
	Vector(int prealloc);
	Vector(int prealloc, int grow_by);
	~Vector();

private:
	T *_data;
	int _actual_size;
	int _size;
	int _grow_by;
};

template <class T>
void Vector<T>::push_back(const T &element) {
	ensure_capacity(_size + 1);

	_data[_size++] = element;
}

template <class T>
void Vector<T>::pop_back() {
	if (_size == 0) {
		return;
	}

	--_size;
}

template <class T>
void Vector<T>::remove(const int index) {
	_data[index] = _data[_size - 1];

	--_size;
}

template <class T>
void Vector<T>::remove_keep_order(const int index) {
	--_size;

	for (int i = index; i < _size; ++i) {
		_data[i] = _data[i + 1];
	}
}

template <class T>
void Vector<T>::erase(const T &element) {
	int index = find(element);

	if (index != -1) {
		remove(index);
	}
}

template <class T>
void Vector<T>::clear() {
	_size = 0;
}

template <class T>
bool Vector<T>::empty() const {
	return _size == 0;
}

template <class T>
T Vector<T>::get(const int index) {
	return _data[index];
}

template <class T>
const T &Vector<T>::get(const int index) const {
	return _data[index];
}

template <class T>
void Vector<T>::set(const int index, const T &value) {
	_data[index] = value;
}

template <class T>
void Vector<T>::swap(const int index1, const int index2) {
	T e = _data[index1];
	_data[index1] = _data[index2];
	_data[index2] = e;
}

template <class T>
void Vector<T>::sort_inc() {
	for (int i = 0; i < _size; ++i) {
		for (int j = i + 1; j < _size; ++j) {
			if (_data[j] < _data[i]) {
				swap(i, j);
			}
		}
	}
}

template <class T>
void Vector<T>::sort_dec() {
	for (int i = 0; i < _size; ++i) {
		for (int j = i + 1; j < _size; ++j) {
			if (_data[j] > _data[i]) {
				swap(i, j);
			}
		}
	}
} 

template <class T>
int Vector<T>::size() const {
	return _size;
}

template <class T>
int Vector<T>::capacity() const {
	return _actual_size;
}

template <class T>
void Vector<T>::ensure_capacity(const int capacity) {
	if (capacity <= _actual_size) {
		return;
	}

	int tsize = capacity + _grow_by;

	T *nd = new T[tsize];

	if (_data) {
		for (int i = 0; i < _size; ++i) {
			nd[i] = _data[i];
		}

		delete[] _data;
	}

	_data = nd;
	_actual_size = tsize;
}

template <class T>
void Vector<T>::resize(const int s) {
	ensure_capacity(s);

	_size = s;
}

template <class T>
void Vector<T>::append_array(const Vector<T> &other) {
	ensure_capacity(_size + other._size);

	for (int i = 0; i < other._size; ++i) {
		_data[_size++] = other._data[i];
	}
}

template <class T>
int Vector<T>::find(const T &val) const {
	for (int i = 0; i < _size; ++i) {
		if (_data[i] == val) {
			return i;
		}
	}

	return -1;
}

template <class T>
T *Vector<T>::dataw() {
	return _data;
}

template <class T>
const T *Vector<T>::data() const {
	return _data;
}

template <class T>
const T &Vector<T>::operator[](const int index) const {
	return _data[index];
}

template <class T>
T &Vector<T>::operator[](const int index) {
	return _data[index];
}

template <class T>
Vector<T>::Vector() {
	_data = nullptr;
	_actual_size = 0;
	_size = 0;
	_grow_by = 100;
}

template <class T>
Vector<T>::Vector(int prealloc) {
	_data = nullptr;
	_actual_size = 0;
	_size = 0;
	_grow_by = 100;

	ensure_capacity(prealloc);
}

template <class T>
Vector<T>::Vector(int prealloc, int grow_by) {
	_data = nullptr;
	_actual_size = 0;
	_size = 0;
	_grow_by = grow_by;

	ensure_capacity(prealloc);
}

template <class T>
Vector<T>::~Vector() {
	if (_data) {
		delete[] _data;
		_data = nullptr;
	}
}

#endif