/**++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 *
 *                                              PANIC
 *                              Portable Algorithms and Numerics In C++
 *
 *                       Scientific computing from scratch, with feeling.
 *
 * Copyright (c) 2026 Michelle Bausager
 *
 * This file is part of PANIC.
 *
 * PANIC is free software licensed under the GNU General Public License v3.0 or later.
 * You may redistribute and/or modify it under the terms of the GPL.
 *
 * PANIC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the LICENSE file for the full license text.
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 *++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 *
 * Project Name:      PANIC
 * Module Name:       tensor
 * File Name:         vector.hpp
 * Revision:          0.1.0
 * Date:              23-06-2026
 * Author:            Michelle Bausager
 *
 * Description:
 * Defines the vector object that will be used in the rest of the libraries.
 *
 *++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
#pragma once
//---------------------------------------------------------------------------------------------------------------------------
// INCLUDE DESCRIPTION
//---------------------------------------------------------------------------------------------------------------------------
#include <config/types.hpp> // panic::uint_t, panic::int_t, and panic::real_t


namespace panic{
	namespace tensor{


/**
 * @brief struct for vector object
 *
 * The struct is used for all PANIC libraries
 * It uses dynamic allocation with new[] nad delete[].
 * Copying performs a deep copy.
 */
template <typename T>
struct vector{
	// Variable to store the length of the data array
	panic::types::uint_t length;
	// Pointer to the data array
	T* data;

	 /**
     * @brief Empthy constructor
     *
     */
	vector();

	    /**
     * @brief Contructor with size allocation.
     *
     * @param size Number of elemets in the vector
     */
	vector(panic::types::uint_t size);

    /**
     * @brief Contructor with size allocation and sets it all to a value.
     *
     * @param size Number of elemets in the vector
     * @param value all the values in the vactor.
     */
	vector(panic::types::uint_t size, T value);

	/**
	 * @brief Copy-contructor.
	 *
	 * Computes:
	 * @code
	 * vector a(3);
	 * vector b = a;
	 * @endcode
	 *
	 */
	vector(const vector& other);

	/**
	 * @brief De-contructor, releases memory.
	 *
	 * @note Releases memory.
	 */
	~vector();

	/**
	 * @brief Copy-assignment.
	 *
	 * Computes:
	 * @code
	 * vector a(3);
	 * vector b(5);
	 * b = a;
	 * @endcode
	 *
	 */
	vector& operator=(const vector& other);

	/**
	 * @brief Returns number of elements/size.
	 *
	 * Computes:
	 * @code
	 * m = a.size();
	 * @endcode
	 * 
	 * @note The const tells compiler that the fuction don't edit the objert.
	 */
	panic::types::uint_t size() const;
	
	/**
	 * @brief Function to resize data vactor.
	 *
	 * Computes:
	 * @code
	 * a.resize(6);
	 * @endcode
	 * 
	 * @note It hold all the privious functions if avaliable.
	 */
	bool resize(panic::types::uint_t new_size);

	/**
	 * @brief Fill data with value.
	 *
	 * Computes:
	 * @code
	 * a.fill(3.1415);
	 * @endcode
	 * 
	 * @note Sets all values in the vactor.
	 */
	bool fill(T value);

	/**
	 * @brief Read and write vactor data using index
	 *
	 * Computes:
	 * @code
	 * n = a[3];
	 * @endcode
	 * 
	 * @note This is unchecked and fast.
	 */
	T& operator[](panic::types::uint_t index);

	/**
	 * @brief Read from const vector data using index
	 *
	 * Computes:
	 * @code
	 * n = const a[3];
	 * @endcode
	 * 
	 * @note This is unchecked and fast.
	 */
	const T& operator[](panic::types::uint_t index) const;

	/**
	 * @brief Read and write vactor data using index
	 *
	 * Computes:
	 * @code
	 * n = a.at(3);
	 * @endcode
	 * 
	 * @note This is checked and not fast.
	 */
	T& at(panic::types::uint_t index);

	/**
	 * @brief Read from const vector data using index
	 *
	 * Computes:
	 * @code
	 * n = const a.at(3);
	 * @endcode
	 * 
	 * @note This is checked and not fast.
	 */
	const T& at(panic::types::uint_t index) const;

};


//---------------------------------------------------------------------------------------------------------------------------
// TYPE ALIASES
//---------------------------------------------------------------------------------------------------------------------------

typedef vector<panic::types::real_t> real_vector;
typedef vector<panic::types::int_t>  int_vector;
typedef vector<panic::types::uint_t> uint_vector;

//---------------------------------------------------------------------------------------------------------------------------
// EXPLICIT TEMPLATE DECLARATION
//---------------------------------------------------------------------------------------------------------------------------

extern template struct vector<panic::types::real_t>;
extern template struct vector<panic::types::int_t>;
extern template struct vector<panic::types::uint_t>;


	} // namespace tensor
} // namespace panic