#include <stdlib.h>
#include <string.h>
#include "matrix.h"

// TODO Matrix-Funktionen implementieren

Matrix createMatrix(unsigned int rows, unsigned int cols)
{
    Matrix m;

    m.rows = rows;
    m.cols = cols;

    m.data = malloc (rows * cols * sizeof(int));

    return m;
}

void clearMatrix(Matrix *matrix)
{
    
    if (matrix == NULL) {
        return;
    }

    // Speicher freigeben, falls vorhanden
    free(matrix->data);
    matrix->data = NULL;

    // Metadaten zurücksetzen
    matrix->rows = 0;
    matrix->cols = 0;
}

void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
{
    matrix.data[rowIdx * matrix.cols + colIdx] = value; //setzte Matrix auf den Wert value am Punkt (row col)
}

MatrixType getMatrixAt(const Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
{
    MatrixType value = 0;

    return value = matrix.data[rowIdx * matrix.cols + colIdx]; //hole Wert value am Punkt (row col)
}

Matrix add(const Matrix matrix1, const Matrix matrix2)
{
    Matrix result = {0};
 
    if(matrix1.rows != matrix2.rows || matrix1.cols != matrix2.cols)
    {
        return result;
    }

    result.rows = matrix1.rows;
    result.cols = matrix1.cols;
    result.data = malloc(result.rows * result.cols * sizeof(MatrixType));

    //wenn Data nicht allokiert werden kann dann zurücksetzen und abbrechen
    if(result.data == NULL)
    {
        result.rows = result.cols = 0;

        return result;
    }

    //Matritzenaddition
    for (unsigned int i = 0; i < result.rows; i++) 
    {
        for (unsigned int j = 0; j < result.cols; j++) 
        {
            result.data[i * result.cols + j] = matrix1.data[i * matrix1.cols + j] + matrix2.data[i * matrix2.cols + j];
            
        }
    }
    return result;
}

Matrix multiply(const Matrix matrix1, const Matrix matrix2)
{
    Matrix result = {0};
 
    if(matrix1.rows != matrix2.rows || matrix1.cols != matrix2.cols)
    {
        return result;
    }

    result.rows = matrix1.rows;
    result.cols = matrix1.cols;
    result.data = malloc(result.rows * result.cols * sizeof(MatrixType));

    //wenn Data nicht allokiert werden kann dann zurücksetzen und abbrechen
    if(result.data == NULL)
    {
        result.rows = result.cols = 0;

        return result;
    }

    //Matritzenmultiplikation
    for (unsigned int i = 0; i < result.rows; i++) 
    {
        for (unsigned int j = 0; j < result.cols; j++) 
        {
            MatrixType sum = 0;
            for (unsigned int k = 0; k < matrix1.cols; k++) 
            {
                sum += matrix1.data[i * matrix1.cols + k] * matrix2.data[k * matrix2.cols + j];
            }
            result.data[i * result.cols + j] = sum;
        }
    }

    return result;
}