#ifndef GRAPH_H
#define GRAPH_H

#include <stdlib.h>

typedef struct Graph Graph;
typedef struct Vertex Vertex;
typedef struct Edge Edge;

typedef enum {
    GRAPH_OK,
    GRAPH_BAD_ALLOC,
    GRAPH_VERTEX_NOT_FOUND,
    GRAPH_NULL_ARG,
} GraphErr ;

typedef enum {
    GRAPH_DIRECTED,
    GRAPH_UNDIRECTED,
} GraphType;

Graph *graph_create(GraphType type);
GraphErr graph_destroy(Graph **graph);

GraphErr graph_add_vertex(Graph *graph);

GraphErr graph_connect_vertex(
    Graph *graph,
    size_t node1,
    size_t node2,
    size_t weight);

GraphErr graph_vertex_count(Graph *graph, size_t *out);
GraphErr graph_get_vertex(Graph *graph, size_t index, Vertex *out);

#endif