#include "web_dom.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <emscripten/emscripten.h>

struct elem *elem_init(char *ns, char *name, int size_attrs)
{
	struct elem *e = malloc(sizeof(*e));

	e->ns = ns ? strdup(ns) : NULL;
	e->name = strdup(name);

	e->n_attrs = 0;
	e->size_attrs = size_attrs;
	e->attr_names = malloc(size_attrs * sizeof(*(e->attr_names)));
	e->attr_vals = malloc(size_attrs * sizeof(*(e->attr_vals)));
	e->content = NULL;

	return e;
}

void elem_free(struct elem *e)
{
	for(int i = 0; i < e->n_attrs; ++i) {
		free(e->attr_names[i]);
		free(e->attr_vals[i]);
	}

	free(e->content);
	free(e->attr_names);
	free(e->attr_vals);
	free(e->name);
	free(e);
}

void elem_add_attr(struct elem *e, char *name, char *val)
{
	if (e->n_attrs == e->size_attrs) {
		e->size_attrs *= 2;
		e->attr_names = realloc(e->attr_names,
			e->size_attrs * sizeof(*(e->attr_names)));
		e->attr_vals = realloc(e->attr_vals,
			e->size_attrs * sizeof(*(e->attr_vals)));
	}

	e->attr_names[e->n_attrs] = strdup(name);
	e->attr_vals[e->n_attrs++] = strdup(val);
}

void elem_add_attr_double(struct elem *e, char *name, double val)
{
	char str[512];
	sprintf(str, "%f", val);
	elem_add_attr(e, name, str);
}

void append_elemv(char *sel, int elemc, struct elem **elemv)
{
	EM_ASM({elemAppendElemv($0, $1, $2, $3, $4, $5, $6, $7, $8)},
		sel, elemc, elemv,
		offsetof(struct elem, ns),
		offsetof(struct elem, name),
		offsetof(struct elem, content),
		offsetof(struct elem, n_attrs),
		offsetof(struct elem, attr_names),
		offsetof(struct elem, attr_vals));
}