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/*
 * Copyright 2012 Vincent Sanders <vince@netsurf-browser.org>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * NetSurf is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "javascript/jsapi.h"
#include "javascript/jsapi/binding.h"

#include "content/content.h"
#include "javascript/content.h"
#include "javascript/js.h"

#include "utils/log.h"

static JSRuntime *rt; /* global runtime */

void js_initialise(void)
{
	/* Create a JS runtime. */

#if JS_VERSION >= 180
        JS_SetCStringsAreUTF8(); /* we prefer our runtime to be utf-8 */
#endif

	rt = JS_NewRuntime(8L * 1024L * 1024L);
	JSLOG("New runtime handle %p", rt);

	/* register script content handler */
	javascript_init();
}

void js_finalise(void)
{
	if (rt != NULL) {
		JSLOG("destroying runtime handle %p", rt);
		JS_DestroyRuntime(rt);
	}
	JS_ShutDown();
}

/* The error reporter callback. */
static void js_reportError(JSContext *cx, const char *message, JSErrorReport *report)
{
	JSLOG("%s:%u:%s",
	      report->filename ? report->filename : "<no filename>",
	      (unsigned int) report->lineno,
	      message);
}

jscontext *js_newcontext(void)
{
	JSContext *cx;

	if (rt == NULL) {
		return NULL;
	}

	cx = JS_NewContext(rt, 8192);
	if (cx == NULL) {
		return NULL;
	}
	JS_SetOptions(cx, JSOPTION_VAROBJFIX | JSOPTION_JIT );
	JS_SetVersion(cx, JSVERSION_LATEST);
	JS_SetErrorReporter(cx, js_reportError);

	/*JS_SetGCZeal(cx, 2); */

	JSLOG("New Context %p", cx);

	return (jscontext *)cx;
}

void js_destroycontext(jscontext *ctx)
{
	JSContext *cx = (JSContext *)ctx;
	if (cx != NULL) {
		JSLOG("Destroying Context %p", cx);
		JS_DestroyContext(cx);
	}
}


/** Create new compartment to run scripts within
 *
 * This performs the following actions
 * 1. constructs a new global object by initialising a window class
 * 2. Instantiate the global a window object 
 */
jsobject *js_newcompartment(jscontext *ctx, void *win_priv, void *doc_priv)
{
	JSContext *cx = (JSContext *)ctx;
	JSObject *window_proto;
	JSObject *window;

	if (cx == NULL) {
		return NULL;
	}

	window_proto = jsapi_InitClass_Window(cx, NULL);
	if (window_proto == NULL) {
		JSLOG("Unable to initialise window class");
		return NULL;
	}

	window = jsapi_new_Window(cx, window_proto, NULL, win_priv, doc_priv);
	
	return (jsobject *)window;
}

bool js_exec(jscontext *ctx, const char *txt, size_t txtlen)
{
	JSContext *cx = (JSContext *)ctx;
	jsval rval;

	/* JSLOG("%p \"%s\"",cx ,txt); */

	if (ctx == NULL) {
		return false;
	}

	if (txt == NULL) {
		return false;
	}

	if (txtlen == 0) {
		return false;
	}

	if (JS_EvaluateScript(cx, 
			      JS_GetGlobalObject(cx), 
			      txt, txtlen, 
			      "<head>", 0, &rval) == JS_TRUE) {

		return true;
	}

	return false;
}

bool js_fire_event(jscontext *ctx, const char *type, void *target)
{
	JSContext *cx = (JSContext *)ctx;
	dom_node *node = target;
	JSObject *jsevent;
	jsval rval;
	jsval argv[1];
	JSBool ret = JS_TRUE;
	dom_exception exc;
	dom_event *event;
	dom_string *type_dom;

	if (node == NULL) {
		/* deliver to window */
		if (cx == NULL) {
			return false;
		}

		exc = dom_string_create((unsigned char*)type, strlen(type), &type_dom);
		if (exc != DOM_NO_ERR) {
			return false;
		}

/*		exc = dom_event_create(document, &event);*/
		exc = -1;
		if (exc != DOM_NO_ERR) {
			return false;
		}

		exc = dom_event_init(event, type_dom, false, false);
		dom_string_unref(type_dom);
		if (exc != DOM_NO_ERR) {
			return false;
		}

		jsevent = jsapi_new_Event(cx, NULL, NULL, event);
		if (jsevent == NULL) {
			return false;
		}

		argv[0] = OBJECT_TO_JSVAL(jsevent);

		ret = JS_CallFunctionName(cx, 
					  JS_GetGlobalObject(cx), 
					  "dispatchEvent", 
					  1, 
					  argv, 
					  &rval);
	} 

	if (ret == JS_TRUE) {
		return true;
	}
	return false;
}