/*
 * Copyright (c) 2011 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER OR 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 "core/inspector/MainThreadDebugger.h"

#include "bindings/core/v8/BindingSecurity.h"
#include "bindings/core/v8/DOMWrapperWorld.h"
#include "bindings/core/v8/ScriptController.h"
#include "bindings/core/v8/V8Window.h"
#include "core/dom/ExecutionContext.h"
#include "core/frame/FrameConsole.h"
#include "core/frame/LocalDOMWindow.h"
#include "core/frame/LocalFrame.h"
#include "core/frame/UseCounter.h"
#include "core/inspector/IdentifiersFactory.h"
#include "core/inspector/InspectedFrames.h"
#include "core/inspector/InspectorTaskRunner.h"
#include "core/workers/MainThreadWorkletGlobalScope.h"
#include "platform/UserGestureIndicator.h"
#include "platform/v8_inspector/public/V8Debugger.h"
#include "wtf/OwnPtr.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/ThreadingPrimitives.h"

namespace blink {

namespace {

int frameId(LocalFrame* frame)
{
    ASSERT(frame);
    return WeakIdentifierMap<LocalFrame>::identifier(frame);
}

}

// TODO(Oilpan): avoid keeping a raw reference separate from the
// owner one; does not enable heap-movable objects.
MainThreadDebugger* MainThreadDebugger::s_instance = nullptr;

MainThreadDebugger::MainThreadDebugger(PassOwnPtr<ClientMessageLoop> clientMessageLoop, v8::Isolate* isolate)
    : ThreadDebugger(isolate)
    , m_clientMessageLoop(clientMessageLoop)
    , m_taskRunner(adoptPtr(new InspectorTaskRunner()))
{
    MutexLocker locker(creationMutex());
    ASSERT(!s_instance);
    s_instance = this;
}

MainThreadDebugger::~MainThreadDebugger()
{
    MutexLocker locker(creationMutex());
    ASSERT(s_instance == this);
    s_instance = nullptr;
}

Mutex& MainThreadDebugger::creationMutex()
{
    DEFINE_THREAD_SAFE_STATIC_LOCAL(Mutex, mutex, (new Mutex));
    return mutex;
}

void MainThreadDebugger::contextCreated(ScriptState* scriptState, LocalFrame* frame, SecurityOrigin* origin)
{
    ASSERT(isMainThread());
    v8::HandleScope handles(scriptState->isolate());
    DOMWrapperWorld& world = scriptState->world();
    V8Debugger::setContextDebugData(scriptState->context(), world.isMainWorld() ? "page" : "injected", contextGroupId(frame));
    if (s_instance)
        s_instance->debugger()->contextCreated(V8ContextInfo(scriptState->context(), world.isMainWorld(), origin ? origin->toRawString() : "", world.isIsolatedWorld() ? world.isolatedWorldHumanReadableName() : "", IdentifiersFactory::frameId(frame)));
}

void MainThreadDebugger::contextWillBeDestroyed(ScriptState* scriptState)
{
    if (s_instance) {
        v8::HandleScope handles(scriptState->isolate());
        s_instance->debugger()->contextDestroyed(scriptState->context());
    }
}

int MainThreadDebugger::contextGroupId(LocalFrame* frame)
{
    LocalFrame* localFrameRoot = frame->localFrameRoot();
    return frameId(localFrameRoot);
}

MainThreadDebugger* MainThreadDebugger::instance()
{
    ASSERT(isMainThread());
    return s_instance;
}

void MainThreadDebugger::interruptMainThreadAndRun(PassOwnPtr<InspectorTaskRunner::Task> task)
{
    MutexLocker locker(creationMutex());
    if (s_instance) {
        s_instance->m_taskRunner->appendTask(task);
        s_instance->m_taskRunner->interruptAndRunAllTasksDontWait(s_instance->m_isolate);
    }
}

void MainThreadDebugger::runMessageLoopOnPause(int contextGroupId)
{
    LocalFrame* pausedFrame = WeakIdentifierMap<LocalFrame>::lookup(contextGroupId);
    // Do not pause in Context of detached frame.
    if (!pausedFrame)
        return;
    ASSERT(pausedFrame == pausedFrame->localFrameRoot());

    if (UserGestureToken* token = UserGestureIndicator::currentToken())
        token->setPauseInDebugger();
    // Wait for continue or step command.
    m_clientMessageLoop->run(pausedFrame);
}

void MainThreadDebugger::quitMessageLoopOnPause()
{
    m_clientMessageLoop->quitNow();
}

void MainThreadDebugger::muteWarningsAndDeprecations()
{
    FrameConsole::mute();
    UseCounter::muteForInspector();
}

void MainThreadDebugger::unmuteWarningsAndDeprecations()
{
    FrameConsole::unmute();
    UseCounter::unmuteForInspector();
}

bool MainThreadDebugger::callingContextCanAccessContext(v8::Local<v8::Context> calling, v8::Local<v8::Context> target)
{
    ExecutionContext* executionContext = toExecutionContext(target);
    ASSERT(executionContext);

    if (executionContext->isWorkletGlobalScope()) {
        MainThreadWorkletGlobalScope* globalScope = toMainThreadWorkletGlobalScope(executionContext);
        return globalScope && BindingSecurity::shouldAllowAccessTo(m_isolate, toLocalDOMWindow(toDOMWindow(calling)), globalScope, DoNotReportSecurityError);
    }

    DOMWindow* window = toDOMWindow(target);
    return window && BindingSecurity::shouldAllowAccessTo(m_isolate, toLocalDOMWindow(toDOMWindow(calling)), window, DoNotReportSecurityError);
}

void MainThreadDebugger::contextsToReport(int contextGroupId, V8ContextInfoVector& contexts)
{
    LocalFrame* root = WeakIdentifierMap<LocalFrame>::lookup(contextGroupId);
    if (!root)
        return;

    // Only report existing contexts if the page did commit load, otherwise we may
    // unintentionally initialize contexts in the frames which may trigger some listeners
    // that are expected to be triggered only after the load is committed, see http://crbug.com/131623
    if (!root->loader().stateMachine()->committedFirstRealDocumentLoad())
        return;

    OwnPtrWillBeRawPtr<InspectedFrames> inspectedFrames = InspectedFrames::create(root);

    Vector<std::pair<ScriptState*, SecurityOrigin*>> isolatedContexts;
    for (LocalFrame* frame : *inspectedFrames) {
        if (!frame->script().canExecuteScripts(NotAboutToExecuteScript))
            continue;
        String frameId = IdentifiersFactory::frameId(frame);

        // Ensure execution context is created.
        // If initializeMainWorld returns true, then is registered by didCreateScriptContext
        if (!frame->script().initializeMainWorld()) {
            ScriptState* scriptState = ScriptState::forMainWorld(frame);
            contexts.append(V8ContextInfo(scriptState->context(), true, "", "", frameId));
        }
        frame->script().collectIsolatedContexts(isolatedContexts);
        if (isolatedContexts.isEmpty())
            continue;
        for (const auto& pair : isolatedContexts) {
            String originString = pair.second ? pair.second->toRawString() : "";
            ScriptState* scriptState = pair.first;
            contexts.append(V8ContextInfo(scriptState->context(), false, originString, scriptState->world().isolatedWorldHumanReadableName(), frameId));
        }
        isolatedContexts.clear();
    }
}

} // namespace blink