/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
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 * 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.
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 * 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
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 */

#include "config.h"
#include "WorkerAsyncFileSystemChromium.h"

#include "WebFileSystemCallbacksImpl.h"
#include "WebFileWriter.h"
#include "WorkerAsyncFileWriterChromium.h"
#include "WorkerFileSystemCallbacksBridge.h"
#include "bindings/v8/WorkerScriptController.h"
#include "core/fileapi/BlobURL.h"
#include "core/platform/AsyncFileSystemCallbacks.h"
#include "core/platform/FileMetadata.h"
#include "core/platform/FileSystem.h"
#include "core/platform/NotImplemented.h"
#include "core/workers/WorkerGlobalScope.h"
#include "core/workers/WorkerThread.h"
#include "public/platform/WebFileSystem.h"
#include "wtf/text/CString.h"

using namespace WebKit;

namespace WebCore {

static const char fileSystemOperationsMode[] = "fileSystemOperationsMode";

WorkerAsyncFileSystemChromium::WorkerAsyncFileSystemChromium(ScriptExecutionContext* context, FileSystemSynchronousType synchronousType)
    : m_scriptExecutionContext(context)
    , m_workerGlobalScope(toWorkerGlobalScope(context))
    , m_synchronousType(synchronousType)
{
    ASSERT(m_scriptExecutionContext->isWorkerGlobalScope());

    m_workerLoaderProxy = &m_workerGlobalScope->thread()->workerLoaderProxy();
}

WorkerAsyncFileSystemChromium::~WorkerAsyncFileSystemChromium()
{
}

bool WorkerAsyncFileSystemChromium::waitForOperationToComplete()
{
    if (!m_bridgeForCurrentOperation)
        return false;

    RefPtr<WorkerFileSystemCallbacksBridge> bridge = m_bridgeForCurrentOperation.release();
    if (m_workerGlobalScope->thread()->runLoop().runInMode(m_workerGlobalScope, m_modeForCurrentOperation) == MessageQueueTerminated) {
        bridge->stop();
        return false;
    }
    return true;
}

void WorkerAsyncFileSystemChromium::move(const KURL& sourcePath, const KURL& destinationPath, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
{
    createWorkerFileSystemCallbacksBridge(callbacks)->postMoveToMainThread(m_webFileSystem, sourcePath, destinationPath, m_modeForCurrentOperation);
}

void WorkerAsyncFileSystemChromium::copy(const KURL& sourcePath, const KURL& destinationPath, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
{
    createWorkerFileSystemCallbacksBridge(callbacks)->postCopyToMainThread(m_webFileSystem, sourcePath, destinationPath, m_modeForCurrentOperation);
}

void WorkerAsyncFileSystemChromium::remove(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
{
    createWorkerFileSystemCallbacksBridge(callbacks)->postRemoveToMainThread(m_webFileSystem, path, m_modeForCurrentOperation);
}

void WorkerAsyncFileSystemChromium::removeRecursively(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
{
    createWorkerFileSystemCallbacksBridge(callbacks)->postRemoveRecursivelyToMainThread(m_webFileSystem, path, m_modeForCurrentOperation);
}

void WorkerAsyncFileSystemChromium::readMetadata(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
{
    createWorkerFileSystemCallbacksBridge(callbacks)->postReadMetadataToMainThread(m_webFileSystem, path, m_modeForCurrentOperation);
}

void WorkerAsyncFileSystemChromium::createFile(const KURL& path, bool exclusive, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
{
    createWorkerFileSystemCallbacksBridge(callbacks)->postCreateFileToMainThread(m_webFileSystem, path, exclusive, m_modeForCurrentOperation);
}

void WorkerAsyncFileSystemChromium::createDirectory(const KURL& path, bool exclusive, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
{
    createWorkerFileSystemCallbacksBridge(callbacks)->postCreateDirectoryToMainThread(m_webFileSystem, path, exclusive, m_modeForCurrentOperation);
}

void WorkerAsyncFileSystemChromium::fileExists(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
{
    createWorkerFileSystemCallbacksBridge(callbacks)->postFileExistsToMainThread(m_webFileSystem, path, m_modeForCurrentOperation);
}

void WorkerAsyncFileSystemChromium::directoryExists(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
{
    createWorkerFileSystemCallbacksBridge(callbacks)->postDirectoryExistsToMainThread(m_webFileSystem, path, m_modeForCurrentOperation);
}

void WorkerAsyncFileSystemChromium::readDirectory(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
{
    createWorkerFileSystemCallbacksBridge(callbacks)->postReadDirectoryToMainThread(m_webFileSystem, path, m_modeForCurrentOperation);
}

class WorkerFileWriterHelperCallbacks : public AsyncFileSystemCallbacks {
public:
    static PassOwnPtr<WorkerFileWriterHelperCallbacks> create(AsyncFileWriterClient* client, const WebURL& path, WebKit::WebFileSystem* webFileSystem, PassOwnPtr<WebCore::AsyncFileSystemCallbacks> callbacks, WorkerGlobalScope* workerGlobalScope)
    {
        return adoptPtr(new WorkerFileWriterHelperCallbacks(client, path, webFileSystem, callbacks, workerGlobalScope));
    }

    virtual void didReadMetadata(const FileMetadata& metadata)
    {
        ASSERT(m_callbacks);
        if (metadata.type != FileMetadata::TypeFile || metadata.length < 0)
            m_callbacks->didFail(WebKit::WebFileErrorInvalidState);
        else {
            OwnPtr<WorkerAsyncFileWriterChromium> asyncFileWriterChromium = WorkerAsyncFileWriterChromium::create(m_webFileSystem, m_path, m_workerGlobalScope, m_client, WorkerAsyncFileWriterChromium::Asynchronous);
            m_callbacks->didCreateFileWriter(asyncFileWriterChromium.release(), metadata.length);
        }
    }

    virtual void didFail(int code)
    {
        ASSERT(m_callbacks);
        m_callbacks->didFail(code);
    }

private:
    WorkerFileWriterHelperCallbacks(AsyncFileWriterClient* client, const WebURL& path, WebKit::WebFileSystem* webFileSystem, PassOwnPtr<WebCore::AsyncFileSystemCallbacks> callbacks, WorkerGlobalScope* workerGlobalScope)
        : m_client(client)
        , m_path(path)
        , m_webFileSystem(webFileSystem)
        , m_callbacks(callbacks)
        , m_workerGlobalScope(workerGlobalScope)
    {
    }

    AsyncFileWriterClient* m_client;
    WebURL m_path;
    WebKit::WebFileSystem* m_webFileSystem;
    OwnPtr<WebCore::AsyncFileSystemCallbacks> m_callbacks;
    WorkerGlobalScope* m_workerGlobalScope;
};

void WorkerAsyncFileSystemChromium::createWriter(AsyncFileWriterClient* client, const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
{
    createWorkerFileSystemCallbacksBridge(WorkerFileWriterHelperCallbacks::create(client, path, m_webFileSystem, callbacks, m_workerGlobalScope))->postReadMetadataToMainThread(m_webFileSystem, path, m_modeForCurrentOperation);
}

void WorkerAsyncFileSystemChromium::createSnapshotFileAndReadMetadata(const KURL& path, PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
{
    createWorkerFileSystemCallbacksBridge(callbacks)->postCreateSnapshotFileToMainThread(m_webFileSystem, path, m_modeForCurrentOperation);
}

PassRefPtr<WorkerFileSystemCallbacksBridge> WorkerAsyncFileSystemChromium::createWorkerFileSystemCallbacksBridge(PassOwnPtr<AsyncFileSystemCallbacks> callbacks)
{
    ASSERT_UNUSED(m_synchronousType, m_synchronousType == AsynchronousFileSystem || !m_bridgeForCurrentOperation);

    m_modeForCurrentOperation = fileSystemOperationsMode;
    m_modeForCurrentOperation.append(String::number(m_workerGlobalScope->thread()->runLoop().createUniqueId()));

    m_bridgeForCurrentOperation = WorkerFileSystemCallbacksBridge::create(m_workerLoaderProxy, m_scriptExecutionContext, new WebKit::WebFileSystemCallbacksImpl(callbacks));
    return m_bridgeForCurrentOperation;
}

} // namespace WebCore