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 * modification, are permitted provided that the following conditions are
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 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
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#include "config.h"
#include "V8InjectedScriptHost.h"

#include "DOMWindow.h"
#include "Database.h"
#include "Frame.h"
#include "InjectedScript.h"
#include "InjectedScriptHost.h"
#include "InspectorController.h"
#include "Node.h"
#include "Page.h"
#include "SerializedScriptValue.h"

#include "V8Binding.h"
#include "V8Database.h"
#include "V8Node.h"
#include "V8Proxy.h"
#include "V8Storage.h"
#include <wtf/RefPtr.h>

namespace WebCore {

static void WeakReferenceCallback(v8::Persistent<v8::Value> object, void* parameter)
{
    InjectedScriptHost* nativeObject = static_cast<InjectedScriptHost*>(parameter);
    nativeObject->deref();
    object.Dispose();
}

static v8::Local<v8::Object> createInjectedScriptHostV8Wrapper(InjectedScriptHost* host)
{
    V8ClassIndex::V8WrapperType descriptorType = V8ClassIndex::INJECTEDSCRIPTHOST;
    v8::Local<v8::Function> function = V8InjectedScriptHost::GetTemplate()->GetFunction();
    if (function.IsEmpty()) {
        // Return if allocation failed.
        return v8::Local<v8::Object>();
    }
    v8::Local<v8::Object> instance = SafeAllocation::newInstance(function);
    if (instance.IsEmpty()) {
        // Avoid setting the wrapper if allocation failed.
        return v8::Local<v8::Object>();
    }
    V8DOMWrapper::setDOMWrapper(instance, V8ClassIndex::ToInt(descriptorType), host);
    // Create a weak reference to the v8 wrapper of InspectorBackend to deref
    // InspectorBackend when the wrapper is garbage collected.
    host->ref();
    v8::Persistent<v8::Object> weakHandle = v8::Persistent<v8::Object>::New(instance);
    weakHandle.MakeWeak(host, &WeakReferenceCallback);
    return instance;
}

static ScriptObject createInjectedScript(const String& scriptSource, InjectedScriptHost* injectedScriptHost, ScriptState* inspectedScriptState, long id)
{
    v8::HandleScope scope;

    v8::Local<v8::Context> inspectedContext = inspectedScriptState->context();
    v8::Context::Scope contextScope(inspectedContext);

    // Call custom code to create InjectedScripHost wrapper specific for the context
    // instead of calling toV8() that would create the
    // wrapper in the current context.
    // FIXME: make it possible to use generic bindings factory for InjectedScriptHost.
    v8::Local<v8::Object> scriptHostWrapper = createInjectedScriptHostV8Wrapper(injectedScriptHost);
    if (scriptHostWrapper.IsEmpty())
        return ScriptObject();

    v8::Local<v8::Object> windowGlobal = inspectedContext->Global();

    // Inject javascript into the context. The compiled script is supposed to evaluate into
    // a single anonymous function(it's anonymous to avoid cluttering the global object with
    // inspector's stuff) the function is called a few lines below with InjectedScriptHost wrapper,
    // injected script id and explicit reference to the inspected global object. The function is expected
    // to create and configure InjectedScript instance that is going to be used by the inspector.
    v8::Local<v8::Script> script = v8::Script::Compile(v8String(scriptSource));
    v8::Local<v8::Value> v = script->Run();
    ASSERT(!v.IsEmpty());
    ASSERT(v->IsFunction());

    v8::Handle<v8::Value> args[] = {
      scriptHostWrapper,
      windowGlobal,
      v8::Number::New(id)
    };
    v8::Local<v8::Value> injectedScriptValue = v8::Function::Cast(*v)->Call(windowGlobal, 3, args);
    v8::Local<v8::Object> injectedScript(v8::Object::Cast(*injectedScriptValue));
    return ScriptObject(inspectedScriptState, injectedScript);
}

v8::Handle<v8::Value> V8InjectedScriptHost::nodeForIdCallback(const v8::Arguments& args)
{
    INC_STATS("InjectedScriptHost.nodeForId()");
    if (args.Length() < 1)
        return v8::Undefined();

    InjectedScriptHost* host = V8InjectedScriptHost::toNative(args.Holder());
    
    Node* node = host->nodeForId(args[0]->ToInt32()->Value());
    if (!node)
        return v8::Undefined();

    InspectorController* ic = host->inspectorController();
    if (!ic)
        return v8::Undefined();

    return toV8(node);
}

v8::Handle<v8::Value> V8InjectedScriptHost::pushNodePathToFrontendCallback(const v8::Arguments& args)
{
    INC_STATS("InjectedScriptHost.pushNodePathToFrontend()");
    if (args.Length() < 3)
        return v8::Undefined();

    InjectedScriptHost* host = V8InjectedScriptHost::toNative(args.Holder());
    Node* node = V8Node::toNative(v8::Handle<v8::Object>::Cast(args[0]));
    bool withChildren = args[1]->ToBoolean()->Value();
    bool selectInUI = args[2]->ToBoolean()->Value();
    if (node)
        return v8::Number::New(host->pushNodePathToFrontend(node, withChildren, selectInUI));

    return v8::Undefined();
}

#if ENABLE(DATABASE)
v8::Handle<v8::Value> V8InjectedScriptHost::databaseForIdCallback(const v8::Arguments& args)
{
    INC_STATS("InjectedScriptHost.databaseForId()");
    if (args.Length() < 1)
        return v8::Undefined();

    InjectedScriptHost* host = V8InjectedScriptHost::toNative(args.Holder());
    Database* database = host->databaseForId(args[0]->ToInt32()->Value());
    if (!database)
        return v8::Undefined();
    return toV8(database);
}

v8::Handle<v8::Value> V8InjectedScriptHost::selectDatabaseCallback(const v8::Arguments& args)
{
    INC_STATS("InjectedScriptHost.selectDatabase()");
    if (args.Length() < 1)
        return v8::Undefined();

    InjectedScriptHost* host = V8InjectedScriptHost::toNative(args.Holder());
    Database* database = V8Database::toNative(v8::Handle<v8::Object>::Cast(args[0]));
    if (database)
        host->selectDatabase(database);

    return v8::Undefined();
}
#endif

#if ENABLE(DOM_STORAGE)
v8::Handle<v8::Value> V8InjectedScriptHost::selectDOMStorageCallback(const v8::Arguments& args)
{
    INC_STATS("InjectedScriptHost.selectDOMStorage()");
    if (args.Length() < 1)
        return v8::Undefined();

    InjectedScriptHost* host = V8InjectedScriptHost::toNative(args.Holder());
    Storage* storage = V8Storage::toNative(v8::Handle<v8::Object>::Cast(args[0]));
    if (storage)
        host->selectDOMStorage(storage);

    return v8::Undefined();
}
#endif

v8::Handle<v8::Value> V8InjectedScriptHost::reportDidDispatchOnInjectedScriptCallback(const v8::Arguments& args)
{
    INC_STATS("InjectedScriptHost.reportDidDispatchOnInjectedScript()");
    if (args.Length() < 3)
        return v8::Undefined();
    InjectedScriptHost* host = V8InjectedScriptHost::toNative(args.Holder());
    int callId = args[0]->ToInt32()->Value();
    RefPtr<SerializedScriptValue> result(SerializedScriptValue::create(args[1]));
    bool isException = args[2]->ToBoolean()->Value();
    host->reportDidDispatchOnInjectedScript(callId, result.get(), isException);
    return v8::Undefined();
}

InjectedScript InjectedScriptHost::injectedScriptFor(ScriptState* inspectedScriptState)
{
    v8::HandleScope handleScope;
    v8::Local<v8::Context> context = inspectedScriptState->context();
    v8::Context::Scope contextScope(context);

    v8::Local<v8::Object> global = context->Global();
    // Skip proxy object. The proxy object will survive page navigation while we need
    // an object whose lifetime consides with that of the inspected context.
    global = v8::Local<v8::Object>::Cast(global->GetPrototype());

    v8::Local<v8::String> key = v8::String::New("Devtools_InjectedScript");
    v8::Local<v8::Value> val = global->GetHiddenValue(key);
    if (!val.IsEmpty() && val->IsObject())
        return InjectedScript(ScriptObject(inspectedScriptState, v8::Local<v8::Object>::Cast(val)));

    ASSERT(!m_injectedScriptSource.isEmpty());
    ScriptObject injectedScriptObject = createInjectedScript(m_injectedScriptSource, this, inspectedScriptState, m_nextInjectedScriptId);
    InjectedScript result(injectedScriptObject);
    m_idToInjectedScript.set(m_nextInjectedScriptId, result);
    ++m_nextInjectedScriptId;
    global->SetHiddenValue(key, injectedScriptObject.v8Object());
    return result;
}

} // namespace WebCore