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#include <iostream>
#include "BF_Assignment.h"

using namespace std;

const int V = 20;
const int MINUS_ONE = -1;
int BFPrevValue[20];

int getIntVertex(char vertex){
    return vertex > 'a' ? vertex - 'a' : vertex - 'A';
}

int traveling() {

}

string BF_Path() {
    return "";
}

void initializeDistances(int BFPrev[20], int BFValue[20], char start_vertex)
{
    int src = getIntVertex(start_vertex);
    
    for (int i = 0; i < V; i++)
    {
        BFPrev[i] = MINUS_ONE;
        BFValue[i] = MINUS_ONE;
    }
}

void copyBFValueToBFPrevValue(int BFValue[V], int BFPrevValue[V]) {
    for (int i = 0; i < V; i++) {
        BFPrevValue[i] = BFValue[i];
    }
}

void BF(int G[V][V], int numOfVertices, char start_vertex, int BFValue[V], int BFPrev[V]) {
    BFValue[getIntVertex(start_vertex)] = 0;
    copyBFValueToBFPrevValue(BFValue, BFPrevValue);
    
    for (int src = 0; src < numOfVertices; src++) {
        for (int dest = 0; dest < numOfVertices; dest++){
            if (G[src][dest] != 0 && BFPrevValue[src] != MINUS_ONE)
            {
                if (BFPrevValue[dest] == MINUS_ONE && BFPrev[dest] == MINUS_ONE) {
                    BFValue[dest] = BFPrevValue[src] + G[src][dest];
                    BFPrev[dest] = src;
                }
                else if (BFPrevValue[src] + G[src][dest] < BFValue[dest])
                {
                    BFValue[dest] = BFPrevValue[src] + G[src][dest];
                    BFPrev[dest] = src;
                }
            }
        }
    }
}

int main()
{
    int G[20][20] = {{0, 72, 89, 77, 2, 58, 13, 69},  
                    {77, 0, 69, 31, 57, 93, 83, 48},
                    {52, 21, 0, 62, 8, 77, 32, 14},
                    {33, 1, 40, 0, 72, 99, 72, 59},
                    {89, 24, 1, 61, 0, 12, 78, 63},  
                    {36, 91, 98, 79, 26, 0, 28, 1},
                    {18, 77, 49, 36, 98, 77, 0, 45}, 
                    {75, 9, 59, 7, 77, 65, 45, 0}};

    int numOfVertices = 8;
    char start_vertex = 'D';
    int BFValue[20];
    int BFPrev[20];
    
    initializeDistances(BFPrev, BFValue, start_vertex);

    for (int i = 0; i < numOfVertices; i++)
    {
        printf("step %d:\n", i + 1);
        BF(G, numOfVertices, start_vertex, BFValue, BFPrev);
        for (int j = 0; j < 8; j++)
        {
            cout << BFValue[j] << " ";
        }
        cout << endl;
        for (int j = 0; j < numOfVertices; j++)
        {
            cout << BFPrev[j] << " ";
        }
        cout << endl;
    }

    return 0;
}