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/**
* @module builtin/v8
*
* ### Synopsis
* SilkJS builtin v8 object.
*
* ### Description
* The builtin/v8 object provides low-level access to some v8 JavaScript engine methods.
*
* ### Usage
* var net = require('builtin/v8');
*
* ### See Also:
* Google's v8 documentation and the source code
*/
#include "SilkJS.h"
#include <v8-debug.h>

struct ScriptWrapper {
    Persistent<Script> script;
};

/**
* @function v8.gc
*
* ### Synopsis
*
* v8.gc();
*
* Call v8's garbage collector.
*/
static JSVAL gc (const Arguments& args) {
    for (int i=0; i<10000; i++) {
        if (V8::IdleNotification()) {
            break;
        }
    }
    return Undefined();
}

/**
* @function v8.compileScript
*
* ### Synopsis
* var script v8.compileScript(source);
*
* Compile a JavaScript source (string) to a v8::Script object. The returned script object should be treated as opaque by JavaScript code.
*
* @param {string} source - JavaScript source code to compile.
* @return {object} script - Compiled JavaScript (opaque handle)
*
* ### Notes
* You should free any scripts you compile with v8.freeScript().
*/

static JSVAL compileScript (JSARGS args) {
    // Persistent<Context>context = Context::New(NULL, ObjectTemplate::New());
    // Context::Scope context_scope(context);
    ScriptWrapper *wrapper = new ScriptWrapper;
    wrapper->script = Persistent<Script>::New(Script::New(args[0]->ToString(), args[1]->ToString()));
    // context.Dispose();
    return Opaque::New(wrapper);
}


/**
* @function v8.runScript
*
* ### Synopsis
*
* var ret = v8.runScript(script);
*
* Run a previously compiled v8::Script - see v8.compileScript above.
* @param {object} script - opaque handle to previously compiled v8::Script.
* @return whatever the script returns.
*/
// runScript(context, script)

static JSVAL runScript (JSARGS args) {
    ScriptWrapper *wrapper = (ScriptWrapper *) JSOPAQUE(args[0]); // wrap->Value();

    // Persistent<Context>context = Context::New(NULL, ObjectTemplate::New());
    // Context::Scope context_scope(context);
    Handle<Value>v = wrapper->script->Run();
    // context.Dispose();
    return v;
}

/**
* @function v8.freeScript
*
* ### Synopsis
*
* v8.freeScript(script);
*
* Free a previously compiled v8::Script. Each compiled script consumes some amount of memory until it is freed.
*
* @param {object} script - opaque handle to script to be freed.
*/
static JSVAL freeScript (JSARGS args) {
    ScriptWrapper *wrapper = (ScriptWrapper *) JSOPAQUE(args[0]);
    wrapper->script.Dispose();
    delete wrapper;
    return Undefined();
}

static void debugger () {
    extern Persistent<Context> context;
    Context::Scope scope(context);
    Debug::ProcessDebugMessages();
}

/**
* @function v8.enableDebugger
*
* ### Synopsis
*
* This function enables the internal v8 debugger on port 5858.
*/
static JSVAL enableDebugger (JSARGS args) {
    HandleScope scope;
    Debug::SetDebugMessageDispatchHandler(debugger, true);
    Debug::EnableAgent("silkjs", 5858, true);
    Debug::DebugBreak();
    return Undefined();
}

void init_v8_object () {
    HandleScope scope;

    Handle<ObjectTemplate>v8 = ObjectTemplate::New();
    v8->Set(String::New("gc"), FunctionTemplate::New(gc));
    v8->Set(String::New("compileScript"), FunctionTemplate::New(compileScript));
    v8->Set(String::New("runScript"), FunctionTemplate::New(runScript));
    v8->Set(String::New("freeScript"), FunctionTemplate::New(freeScript));
    v8->Set(String::New("enableDebugger"), FunctionTemplate::New(enableDebugger));

    builtinObject->Set(String::New("v8"), v8);
}

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