/*
 * Copyright (C) 2010 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,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef FileSystemCallbacks_h
#define FileSystemCallbacks_h

#include "modules/filesystem/EntriesCallback.h"
#include "platform/AsyncFileSystemCallbacks.h"
#include "platform/FileSystemType.h"
#include "wtf/Vector.h"
#include "wtf/text/WTFString.h"

namespace blink {

class DOMFileSystemBase;
class DirectoryReaderBase;
class EntriesCallback;
class EntryCallback;
class ErrorCallback;
class BlobCallback;
class FileMetadata;
class FileSystemCallback;
class FileWriterBase;
class FileWriterBaseCallback;
class MetadataCallback;
class ExecutionContext;
class VoidCallback;

class FileSystemCallbacksBase : public AsyncFileSystemCallbacks {
public:
    ~FileSystemCallbacksBase() override;

    // For ErrorCallback.
    void didFail(int code) final;

    // Other callback methods are implemented by each subclass.

protected:
    FileSystemCallbacksBase(ErrorCallback*, DOMFileSystemBase*, ExecutionContext*);

    bool shouldScheduleCallback() const;

    template <typename CB, typename CBArg>
    void handleEventOrScheduleCallback(RawPtr<CB>, CBArg*);

    template <typename CB>
    void handleEventOrScheduleCallback(RawPtr<CB>);

    Persistent<ErrorCallback> m_errorCallback;
    Persistent<DOMFileSystemBase> m_fileSystem;
    RefPtrWillBePersistent<ExecutionContext> m_executionContext;
    int m_asyncOperationId;
};

// Subclasses ----------------------------------------------------------------

class EntryCallbacks final : public FileSystemCallbacksBase {
public:
    static PassOwnPtr<AsyncFileSystemCallbacks> create(EntryCallback*, ErrorCallback*, ExecutionContext*, DOMFileSystemBase*, const String& expectedPath, bool isDirectory);
    void didSucceed() override;

private:
    EntryCallbacks(EntryCallback*, ErrorCallback*, ExecutionContext*, DOMFileSystemBase*, const String& expectedPath, bool isDirectory);
    Persistent<EntryCallback> m_successCallback;
    String m_expectedPath;
    bool m_isDirectory;
};

class EntriesCallbacks final : public FileSystemCallbacksBase {
public:
    static PassOwnPtr<AsyncFileSystemCallbacks> create(EntriesCallback*, ErrorCallback*, ExecutionContext*, DirectoryReaderBase*, const String& basePath);
    void didReadDirectoryEntry(const String& name, bool isDirectory) override;
    void didReadDirectoryEntries(bool hasMore) override;

private:
    EntriesCallbacks(EntriesCallback*, ErrorCallback*, ExecutionContext*, DirectoryReaderBase*, const String& basePath);
    Persistent<EntriesCallback> m_successCallback;
    Persistent<DirectoryReaderBase> m_directoryReader;
    String m_basePath;
    PersistentHeapVector<Member<Entry>> m_entries;
};

class FileSystemCallbacks final : public FileSystemCallbacksBase {
public:
    static PassOwnPtr<AsyncFileSystemCallbacks> create(FileSystemCallback*, ErrorCallback*, ExecutionContext*, FileSystemType);
    void didOpenFileSystem(const String& name, const KURL& rootURL) override;

private:
    FileSystemCallbacks(FileSystemCallback*, ErrorCallback*, ExecutionContext*, FileSystemType);
    Persistent<FileSystemCallback> m_successCallback;
    FileSystemType m_type;
};

class ResolveURICallbacks final : public FileSystemCallbacksBase {
public:
    static PassOwnPtr<AsyncFileSystemCallbacks> create(EntryCallback*, ErrorCallback*, ExecutionContext*);
    void didResolveURL(const String& name, const KURL& rootURL, FileSystemType, const String& filePath, bool isDirectry) override;

private:
    ResolveURICallbacks(EntryCallback*, ErrorCallback*, ExecutionContext*);
    Persistent<EntryCallback> m_successCallback;
};

class MetadataCallbacks final : public FileSystemCallbacksBase {
public:
    static PassOwnPtr<AsyncFileSystemCallbacks> create(MetadataCallback*, ErrorCallback*, ExecutionContext*, DOMFileSystemBase*);
    void didReadMetadata(const FileMetadata&) override;

private:
    MetadataCallbacks(MetadataCallback*, ErrorCallback*, ExecutionContext*, DOMFileSystemBase*);
    Persistent<MetadataCallback> m_successCallback;
};

class FileWriterBaseCallbacks final : public FileSystemCallbacksBase {
public:
    static PassOwnPtr<AsyncFileSystemCallbacks> create(FileWriterBase*, FileWriterBaseCallback*, ErrorCallback*, ExecutionContext*);
    void didCreateFileWriter(PassOwnPtr<WebFileWriter>, long long length) override;

private:
    FileWriterBaseCallbacks(FileWriterBase*, FileWriterBaseCallback*, ErrorCallback*, ExecutionContext*);
    Persistent<FileWriterBase> m_fileWriter;
    Persistent<FileWriterBaseCallback> m_successCallback;
};

class SnapshotFileCallback final : public FileSystemCallbacksBase {
public:
    static PassOwnPtr<AsyncFileSystemCallbacks> create(DOMFileSystemBase*, const String& name, const KURL&, BlobCallback*, ErrorCallback*, ExecutionContext*);
    virtual void didCreateSnapshotFile(const FileMetadata&, PassRefPtr<BlobDataHandle> snapshot);

private:
    SnapshotFileCallback(DOMFileSystemBase*, const String& name, const KURL&, BlobCallback*, ErrorCallback*, ExecutionContext*);
    String m_name;
    KURL m_url;
    Persistent<BlobCallback> m_successCallback;
};

class VoidCallbacks final : public FileSystemCallbacksBase {
public:
    static PassOwnPtr<AsyncFileSystemCallbacks> create(VoidCallback*, ErrorCallback*, ExecutionContext*, DOMFileSystemBase*);
    void didSucceed() override;

private:
    VoidCallbacks(VoidCallback*, ErrorCallback*, ExecutionContext*, DOMFileSystemBase*);
    Persistent<VoidCallback> m_successCallback;
};

} // namespace blink

#endif // FileSystemCallbacks_h