#include "web_dom.h"

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

#include <emscripten/emscripten.h>

static struct dom_elem *dom_node_init(char *type, int size_attrs)
{
	struct dom_elem *e = calloc(1, sizeof(*e));
	e->type = type; // string literal, not freed

	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)));

	return e;
}

struct dom_elem *dom_elem_init(char *ns, char *name, int size_attrs)
{
	struct dom_elem *e = dom_node_init("element", size_attrs);

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

	return e;
}

struct dom_elem *dom_text_init(char *content)
{
	struct dom_elem *e = dom_node_init("text", 0);
	e->content = strdup(content);

	return e;
}

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

	for (int i = 0; i < e->n_children; ++i) {
		dom_elem_free(e->children[i]);
	}

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

void dom_elem_add_attr(struct dom_elem *e, char *name, char *val)
{
	if (e->n_attrs == e->size_attrs) {
		e->size_attrs += e->size_attrs ? e->size_attrs : 1;
		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 dom_elem_add_attrd(struct dom_elem *e, char *name, double val)
{
	char str[512];
	sprintf(str, "%f", val);
	dom_elem_add_attr(e, name, str);
}

void dom_elem_add_child(struct dom_elem *e, struct dom_elem *child)
{
	if (e->n_children == e->size_children) {
		e->size_children += e->size_children ? e->size_children : 1;
		e->children = realloc(e->children,
			e->size_children * sizeof(*(e->children)));
	}

	e->children[e->n_children++] = child;
}

inline void dom_append_elemv(char *sel, int elemc, struct dom_elem **elemv)
{
	EM_ASM({elemAppendElemv($0, $1, $2, $3, $4, $5, $6, $7, $8, $9, $10,
			$11)},
		sel, elemc, elemv,
		offsetof(struct dom_elem, type),
		offsetof(struct dom_elem, ns),
		offsetof(struct dom_elem, name),
		offsetof(struct dom_elem, content),
		offsetof(struct dom_elem, n_attrs),
		offsetof(struct dom_elem, attr_names),
		offsetof(struct dom_elem, attr_vals),
		offsetof(struct dom_elem, n_children),
		offsetof(struct dom_elem, children));
}

inline char *dom_get_content(char *sel)
{
	return (char *)EM_ASM_INT({return elemGetContent($0)}, sel);
}

inline void dom_set_content(char *sel, char *str)
{
	EM_ASM({elemSetContent($0, $1)}, sel, str);
}

inline void dom_set_value(char *sel, char *str)
{
	EM_ASM({elemSetValue($0, $1)}, sel, str);
}

inline bool dom_has_class(char *sel, char *class)
{
	return EM_ASM_INT({return elemHasClass($0, $1)}, sel, class);
}

inline void dom_add_class(char *sel, char *class)
{
	EM_ASM({elemAddClass($0, $1)}, sel, class);
}

inline void dom_remove_class(char *sel, char *class)
{
	EM_ASM({elemRemoveClass($0, $1)}, sel, class);
}

inline void dom_toggle_class(char *sel, char *class)
{
	EM_ASM({elemToggleClass($0, $1)}, sel, class);
}

inline void dom_set_uniq_class(char *sel, char *class, char *sel_set)
{
	EM_ASM({elemSetUniqClass($0, $1, $2)}, sel, class, sel_set);
}

inline void dom_scroll_to_bottom(char *sel)
{
	EM_ASM({elemScrollToBottom($0)}, sel);
}

inline void dom_enable_exit_dialogue(bool enable)
{
	EM_ASM({enableExitDialogue($0)}, enable);
}