#ifdef HAVE_CONFIG_H
#include "../../ext_config.h"
#endif

#include <php.h>
#include "../../php_ext.h"
#include "../../ext.h"

#include <Zend/zend_operators.h>
#include <Zend/zend_exceptions.h>
#include <Zend/zend_interfaces.h>

#include "kernel/main.h"
#include "kernel/memory.h"
#include "kernel/fcall.h"
#include "kernel/operators.h"
#include "kernel/exception.h"
#include "kernel/concat.h"
#include "kernel/array.h"
#include "kernel/object.h"
#include "include/linear_algebra.h"


/**
 * Eigen
 *
 * The Eigendecompositon or (Spectral decomposition) is a matrix factorization resulting in a
 * matrix of eigenvectors and a corresponding array of eigenvalues.
 *
 * @category    Scientific Computing
 * @package     Rubix/Tensor
 * @author      Andrew DalPino
 */
ZEPHIR_INIT_CLASS(Tensor_Decompositions_Eigen)
{
	ZEPHIR_REGISTER_CLASS(Tensor\\Decompositions, Eigen, tensor, decompositions_eigen, tensor_decompositions_eigen_method_entry, 0);

	/**
	 * The computed eigenvalues.
	 *
	 * @var (int|float)[]
	 */
	zend_declare_property_null(tensor_decompositions_eigen_ce, SL("eigenvalues"), ZEND_ACC_PROTECTED);
	/**
	 * The eigenvectors of the eigendecomposition.
	 *
	 * @var \Tensor\Matrix
	 */
	zend_declare_property_null(tensor_decompositions_eigen_ce, SL("eigenvectors"), ZEND_ACC_PROTECTED);
	return SUCCESS;
}

/**
 * Factory method to decompose a matrix.
 *
 * @param \Tensor\Matrix a
 * @param bool symmetric
 * @throws \Tensor\Exceptions\InvalidArgumentException
 * @throws \Tensor\Exceptions\RuntimeException
 * @return self
 */
PHP_METHOD(Tensor_Decompositions_Eigen, decompose)
{
	zval eig, _6;
	zephir_method_globals *ZEPHIR_METHOD_GLOBALS_PTR = NULL;
	zephir_fcall_cache_entry *_8 = NULL;
	zend_long ZEPHIR_LAST_CALL_STATUS;
	zend_bool symmetric;
	zval *a, a_sub, *symmetric_param = NULL, _0, result, eigenvalues, eigenvectors, _7, _9, _1$$3, _2$$3, _3$$3, _4$$4, _5$$5;
	zval *this_ptr = getThis();

	ZVAL_UNDEF(&a_sub);
	ZVAL_UNDEF(&_0);
	ZVAL_UNDEF(&result);
	ZVAL_UNDEF(&eigenvalues);
	ZVAL_UNDEF(&eigenvectors);
	ZVAL_UNDEF(&_7);
	ZVAL_UNDEF(&_9);
	ZVAL_UNDEF(&_1$$3);
	ZVAL_UNDEF(&_2$$3);
	ZVAL_UNDEF(&_3$$3);
	ZVAL_UNDEF(&_4$$4);
	ZVAL_UNDEF(&_5$$5);
	ZVAL_UNDEF(&eig);
	ZVAL_UNDEF(&_6);
#if PHP_VERSION_ID >= 80000
	bool is_null_true = 1;
	ZEND_PARSE_PARAMETERS_START(1, 2)
		Z_PARAM_OBJECT_OF_CLASS(a, zephir_get_internal_ce(SL("tensor\\matrix")))
		Z_PARAM_OPTIONAL
		Z_PARAM_BOOL(symmetric)
	ZEND_PARSE_PARAMETERS_END();
#endif


	ZEPHIR_MM_GROW();
	zephir_fetch_params(1, 1, 1, &a, &symmetric_param);
	if (!symmetric_param) {
		symmetric = 0;
	} else {
		symmetric = zephir_get_boolval(symmetric_param);
	}


	ZEPHIR_CALL_METHOD(&_0, a, "issquare", NULL, 0);
	zephir_check_call_status();
	if (UNEXPECTED(!zephir_is_true(&_0))) {
		ZEPHIR_INIT_VAR(&_1$$3);
		object_init_ex(&_1$$3, tensor_exceptions_invalidargumentexception_ce);
		ZEPHIR_CALL_METHOD(&_2$$3, a, "shapestring", NULL, 0);
		zephir_check_call_status();
		ZEPHIR_INIT_VAR(&_3$$3);
		ZEPHIR_CONCAT_SSVS(&_3$$3, "Matrix must be", " square, ", &_2$$3, " given.");
		ZEPHIR_CALL_METHOD(NULL, &_1$$3, "__construct", NULL, 3, &_3$$3);
		zephir_check_call_status();
		zephir_throw_exception_debug(&_1$$3, "tensor/decompositions/eigen.zep", 48);
		ZEPHIR_MM_RESTORE();
		return;
	}
	if (symmetric) {
		ZEPHIR_INIT_VAR(&result);
		ZEPHIR_CALL_METHOD(&_4$$4, a, "asarray", NULL, 0);
		zephir_check_call_status();
		tensor_eig_symmetric(&result, &_4$$4);
	} else {
		ZEPHIR_INIT_NVAR(&result);
		ZEPHIR_CALL_METHOD(&_5$$5, a, "asarray", NULL, 0);
		zephir_check_call_status();
		tensor_eig(&result, &_5$$5);
	}
	if (Z_TYPE_P(&result) == IS_NULL) {
		ZEPHIR_THROW_EXCEPTION_DEBUG_STR(tensor_exceptions_runtimeexception_ce, "Failed to decompose matrix.", "tensor/decompositions/eigen.zep", 60);
		return;
	}
	ZEPHIR_INIT_VAR(&eig);
	array_init(&eig);
	zephir_get_arrval(&_6, &result);
	ZEPHIR_CPY_WRT(&eig, &_6);
	ZEPHIR_OBS_VAR(&eigenvalues);
	zephir_array_fetch_long(&eigenvalues, &eig, 0, PH_NOISY, "tensor/decompositions/eigen.zep", 67);
	zephir_array_fetch_long(&_9, &eig, 1, PH_NOISY | PH_READONLY, "tensor/decompositions/eigen.zep", 68);
	ZEPHIR_CALL_CE_STATIC(&_7, tensor_matrix_ce, "quick", &_8, 0, &_9);
	zephir_check_call_status();
	ZEPHIR_CALL_METHOD(&eigenvectors, &_7, "transpose", NULL, 0);
	zephir_check_call_status();
	object_init_ex(return_value, tensor_decompositions_eigen_ce);
	ZEPHIR_CALL_METHOD(NULL, return_value, "__construct", NULL, 25, &eigenvalues, &eigenvectors);
	zephir_check_call_status();
	RETURN_MM();
}

/**
 * @param list<int|float> eigenvalues
 * @param \Tensor\Matrix eigenvectors
 */
PHP_METHOD(Tensor_Decompositions_Eigen, __construct)
{
	zephir_method_globals *ZEPHIR_METHOD_GLOBALS_PTR = NULL;
	zval *eigenvalues_param = NULL, *eigenvectors, eigenvectors_sub;
	zval eigenvalues;
	zval *this_ptr = getThis();

	ZVAL_UNDEF(&eigenvalues);
	ZVAL_UNDEF(&eigenvectors_sub);
#if PHP_VERSION_ID >= 80000
	bool is_null_true = 1;
	ZEND_PARSE_PARAMETERS_START(2, 2)
		Z_PARAM_ARRAY(eigenvalues)
		Z_PARAM_OBJECT_OF_CLASS(eigenvectors, zephir_get_internal_ce(SL("tensor\\matrix")))
	ZEND_PARSE_PARAMETERS_END();
#endif


	ZEPHIR_MM_GROW();
	zephir_fetch_params(1, 2, 0, &eigenvalues_param, &eigenvectors);
	zephir_get_arrval(&eigenvalues, eigenvalues_param);


	zephir_update_property_zval(this_ptr, ZEND_STRL("eigenvalues"), &eigenvalues);
	zephir_update_property_zval(this_ptr, ZEND_STRL("eigenvectors"), eigenvectors);
	ZEPHIR_MM_RESTORE();
}

/**
 * Return the eigenvalues.
 *
 * @return list<int|float>
 */
PHP_METHOD(Tensor_Decompositions_Eigen, eigenvalues)
{
	zval *this_ptr = getThis();



	RETURN_MEMBER(getThis(), "eigenvalues");
}

/**
 * Return the eigenvectors.
 *
 * @return \Tensor\Matrix
 */
PHP_METHOD(Tensor_Decompositions_Eigen, eigenvectors)
{
	zval *this_ptr = getThis();



	RETURN_MEMBER(getThis(), "eigenvectors");
}