/*
 * Copyright (C) 2007-2021 Apple Inc. All rights reserved.
 * Copyright (C) 2008 Matt Lilek <webkit@mattlilek.com>
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "InjectedScriptManager.h"

#include "CatchScope.h"
#include "InjectedScriptHost.h"
#include "InjectedScriptSource.h"
#include "JSLock.h"
#include "JSObjectInlines.h"
#include "SourceCode.h"
#include <wtf/JSONValues.h>

namespace Inspector {

using namespace JSC;

InjectedScriptManager::InjectedScriptManager(InspectorEnvironment& environment, Ref<InjectedScriptHost>&& injectedScriptHost)
    : m_environment(environment)
    , m_injectedScriptHost(WTFMove(injectedScriptHost))
    , m_nextInjectedScriptId(1)
{
}

InjectedScriptManager::~InjectedScriptManager()
{
}

void InjectedScriptManager::connect()
{
}

void InjectedScriptManager::disconnect()
{
    discardInjectedScripts();
}

void InjectedScriptManager::discardInjectedScripts()
{
    m_injectedScriptHost->clearAllWrappers();
    m_idToInjectedScript.clear();
    m_scriptStateToId.clear();
}

InjectedScriptHost& InjectedScriptManager::injectedScriptHost()
{
    return m_injectedScriptHost.get();
}

InjectedScript InjectedScriptManager::injectedScriptForId(int id)
{
    auto it = m_idToInjectedScript.find(id);
    if (it != m_idToInjectedScript.end())
        return it->value;

    for (auto it = m_scriptStateToId.begin(); it != m_scriptStateToId.end(); ++it) {
        if (it->value == id)
            return injectedScriptFor(it->key);
    }

    return InjectedScript();
}

int InjectedScriptManager::injectedScriptIdFor(JSGlobalObject* globalObject)
{
    auto it = m_scriptStateToId.find(globalObject);
    if (it != m_scriptStateToId.end())
        return it->value;

    int id = m_nextInjectedScriptId++;
    m_scriptStateToId.set(globalObject, id);
    return id;
}

InjectedScript InjectedScriptManager::injectedScriptForObjectId(const String& objectId)
{
    auto parsedObjectId = JSON::Value::parseJSON(objectId);
    if (!parsedObjectId)
        return InjectedScript();

    auto resultObject = parsedObjectId->asObject();
    if (!resultObject)
        return InjectedScript();

    auto injectedScriptId = resultObject->getInteger("injectedScriptId"_s);
    if (!injectedScriptId)
        return InjectedScript();

    return m_idToInjectedScript.get(*injectedScriptId);
}

void InjectedScriptManager::releaseObjectGroup(const String& objectGroup)
{
    for (auto& injectedScript : m_idToInjectedScript.values())
        injectedScript.releaseObjectGroup(objectGroup);
}

void InjectedScriptManager::clearEventValue()
{
    for (auto& injectedScript : m_idToInjectedScript.values())
        injectedScript.clearEventValue();
}

void InjectedScriptManager::clearExceptionValue()
{
    for (auto& injectedScript : m_idToInjectedScript.values())
        injectedScript.clearExceptionValue();
}

String InjectedScriptManager::injectedScriptSource()
{
    return StringImpl::createWithoutCopying(InjectedScriptSource_js, sizeof(InjectedScriptSource_js));
}

Expected<JSObject*, NakedPtr<Exception>> InjectedScriptManager::createInjectedScript(const String& source, JSGlobalObject* globalObject, int id)
{
    VM& vm = globalObject->vm();
    JSLockHolder lock(vm);
    auto scope = DECLARE_CATCH_SCOPE(vm);

    SourceCode sourceCode = makeSource(source, { });
    JSValue globalThisValue = globalObject->globalThis();

    NakedPtr<Exception> evaluationException;
    InspectorEvaluateHandler evaluateHandler = m_environment.evaluateHandler();
    JSValue functionValue = evaluateHandler(globalObject, sourceCode, globalThisValue, evaluationException);
    if (evaluationException)
        return makeUnexpected(evaluationException);

    auto callData = getCallData(vm, functionValue);
    if (callData.type == CallData::Type::None)
        return nullptr;

    MarkedArgumentBuffer args;
    args.append(m_injectedScriptHost->wrapper(globalObject));
    args.append(globalThisValue);
    args.append(jsNumber(id));
    ASSERT(!args.hasOverflowed());

    JSValue result = JSC::call(globalObject, functionValue, callData, globalThisValue, args);
    scope.clearException();
    return result.getObject();
}

InjectedScript InjectedScriptManager::injectedScriptFor(JSGlobalObject* globalObject)
{
    auto it = m_scriptStateToId.find(globalObject);
    if (it != m_scriptStateToId.end()) {
        auto it1 = m_idToInjectedScript.find(it->value);
        if (it1 != m_idToInjectedScript.end())
            return it1->value;
    }

    if (!m_environment.canAccessInspectedScriptState(globalObject))
        return InjectedScript();

    int id = injectedScriptIdFor(globalObject);
    auto createResult = createInjectedScript(injectedScriptSource(), globalObject, id);
    if (!createResult) {
        auto& error = createResult.error();
        ASSERT(error);

        if (globalObject->vm().isTerminationException(error))
            return InjectedScript();

        unsigned line = 0;
        unsigned column = 0;
        auto& stack = error->stack();
        if (stack.size() > 0)
            stack[0].computeLineAndColumn(line, column);
        WTFLogAlways("Error when creating injected script: %s (%d:%d)\n", error->value().toWTFString(globalObject).utf8().data(), line, column);
        WTFLogAlways("%s\n", injectedScriptSource().utf8().data());
        RELEASE_ASSERT_NOT_REACHED();
    }
    if (!createResult.value()) {
        WTFLogAlways("Missing injected script object");
        WTFLogAlways("%s\n", injectedScriptSource().utf8().data());
        RELEASE_ASSERT_NOT_REACHED();
    }

    InjectedScript result({ globalObject, createResult.value() }, &m_environment);
    m_idToInjectedScript.set(id, result);
    didCreateInjectedScript(result);
    return result;
}

void InjectedScriptManager::didCreateInjectedScript(const InjectedScript&)
{
    // Intentionally empty. This allows for subclasses to inject additional scripts.
}

} // namespace Inspector