/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

// Storage abstraction.
#ifndef INCLUDED_STORAGE_HPP
#define INCLUDED_STORAGE_HPP

#include <set>
#include <string>

#include <Poco/URI.h>
#include <Poco/Util/Application.h>

#include "Auth.hpp"
#include "Log.hpp"
#include "Util.hpp"

/// Base class of all Storage abstractions.
class StorageBase
{
public:
    /// Represents basic file's attributes.
    /// Used for local and network files.
    class FileInfo
    {
    public:
        FileInfo(const std::string& filename,
                 const std::string& ownerId,
                 const Poco::Timestamp& modifiedTime,
                 size_t size)
            : _filename(filename),
              _ownerId(ownerId),
              _modifiedTime(modifiedTime),
              _size(size)
        {
        }

        bool isValid() const
        {
            // 0-byte files are valid; LO will open them as new docs.
            return !_filename.empty();
        }

        std::string _filename;
        std::string _ownerId;
        Poco::Timestamp _modifiedTime;
        size_t _size;
    };

    enum class SaveResult
    {
        OK,
        DISKFULL,
        FAILED
    };

    /// localStorePath the absolute root path of the chroot.
    /// jailPath the path within the jail that the child uses.
    StorageBase(const Poco::URI& uri,
                const std::string& localStorePath,
                const std::string& jailPath) :
        _uri(uri),
        _localStorePath(localStorePath),
        _jailPath(jailPath),
        _fileInfo("", "lool", Poco::Timestamp::fromEpochTime(0), 0),
        _isLoaded(false)
    {
        LOG_DBG("Storage ctor: " << uri.toString());
    }

    std::string getLocalRootPath() const;

    const std::string getUri() const { return _uri.toString(); }

    const std::string& getRootFilePath() const { return _jailedFilePath; };

    bool isLoaded() const { return _isLoaded; }

    /// Returns the basic information about the file.
    FileInfo getFileInfo() { return _fileInfo; }

    /// Returns a local file path for the given URI.
    /// If necessary copies the file locally first.
    virtual std::string loadStorageFileToLocal() = 0;

    /// Writes the contents of the file back to the source.
    virtual SaveResult saveLocalFileToStorage(const Poco::URI& uriPublic) = 0;

    static size_t getFileSize(const std::string& filename);

    /// Must be called at startup to configure.
    static void initialize();

    /// Storage object creation factory.
    static std::unique_ptr<StorageBase> create(const Poco::URI& uri,
                                               const std::string& jailRoot,
                                               const std::string& jailPath);

protected:
    const Poco::URI _uri;
    std::string _localStorePath;
    std::string _jailPath;
    std::string _jailedFilePath;
    FileInfo _fileInfo;
    bool _isLoaded;

    static bool FilesystemEnabled;
    static bool WopiEnabled;
    /// Allowed/denied WOPI hosts, if any and if WOPI is enabled.
    static Util::RegexListMatcher WopiHosts;
};

/// Trivial implementation of local storage that does not need do anything.
class LocalStorage : public StorageBase
{
public:
    LocalStorage(const Poco::URI& uri,
                 const std::string& localStorePath,
                 const std::string& jailPath) :
        StorageBase(uri, localStorePath, jailPath),
        _isCopy(false)
    {
        LOG_INF("LocalStorage ctor with localStorePath: [" << localStorePath <<
                "], jailPath: [" << jailPath << "], uri: [" << uri.toString() << "].");
    }

    class LocalFileInfo
    {
    public:
        LocalFileInfo(const std::string& userid,
                      const std::string& username)
            : _userid(userid),
              _username(username)
        {
        }

        std::string _userid;
        std::string _username;
    };

    /// Returns the URI specific file data
    /// Also stores the basic file information which can then be
    /// obtained using getFileInfo method
    std::unique_ptr<LocalFileInfo> getLocalFileInfo(const Poco::URI& uriPublic);

    std::string loadStorageFileToLocal() override;

    SaveResult saveLocalFileToStorage(const Poco::URI& uriPublic) override;

private:
    /// True if the jailed file is not linked but copied.
    bool _isCopy;
    static std::atomic<unsigned> LastLocalStorageId;
};

/// WOPI protocol backed storage.
class WopiStorage : public StorageBase
{
public:
    WopiStorage(const Poco::URI& uri,
                const std::string& localStorePath,
                const std::string& jailPath) :
        StorageBase(uri, localStorePath, jailPath),
        _wopiLoadDuration(0)
    {
        LOG_INF("WopiStorage ctor with localStorePath: [" << localStorePath <<
                "], jailPath: [" << jailPath << "], uri: [" << uri.toString() << "].");
    }

    class WOPIFileInfo
    {
    public:
        WOPIFileInfo(const std::string& userid,
                     const std::string& username,
                     const bool userCanWrite,
                     const std::string& postMessageOrigin,
                     const bool hidePrintOption,
                     const bool hideSaveOption,
                     const bool hideExportOption,
                     const bool enableOwnerTermination,
                     const bool disablePrint,
                     const bool disableExport,
                     const bool disableCopy,
                     const std::chrono::duration<double> callDuration)
            : _userid(userid),
              _username(username),
              _userCanWrite(userCanWrite),
              _postMessageOrigin(postMessageOrigin),
              _hidePrintOption(hidePrintOption),
              _hideSaveOption(hideSaveOption),
              _hideExportOption(hideExportOption),
              _enableOwnerTermination(enableOwnerTermination),
              _disablePrint(disablePrint),
              _disableExport(disableExport),
              _disableCopy(disableCopy),
              _callDuration(callDuration)
            {
            }

        /// User id of the user accessing the file
        std::string _userid;
        /// Display Name of user accessing the file
        std::string _username;
        /// If user accessing the file has write permission
        bool _userCanWrite;
        /// WOPI Post message property
        std::string _postMessageOrigin;
        /// Hide print button from UI
        bool _hidePrintOption;
        /// Hide save button from UI
        bool _hideSaveOption;
        /// Hide 'Download as' button/menubar item from UI
        bool _hideExportOption;
        /// If WOPI host has enabled owner termination feature on
        bool _enableOwnerTermination;
        /// If WOPI host has allowed the user to print the document
        bool _disablePrint;
        /// If WOPI host has allowed the user to export the document
        bool _disableExport;
        /// If WOPI host has allowed the user to copy to/from the document
        bool _disableCopy;
        /// Time it took to call WOPI's CheckFileInfo
        std::chrono::duration<double> _callDuration;
    };

    /// Returns the response of CheckFileInfo WOPI call for given URI
    /// Also extracts the basic file information from the response
    /// which can then be obtained using getFileInfo()
    std::unique_ptr<WOPIFileInfo> getWOPIFileInfo(const Poco::URI& uriPublic);

    /// uri format: http://server/<...>/wopi*/files/<id>/content
    std::string loadStorageFileToLocal() override;

    SaveResult saveLocalFileToStorage(const Poco::URI& uriPublic) override;

    /// Total time taken for making WOPI calls during load
    std::chrono::duration<double> getWopiLoadDuration() const { return _wopiLoadDuration; }

private:
    // Time spend in loading the file from storage
    std::chrono::duration<double> _wopiLoadDuration;
};

/// WebDAV protocol backed storage.
class WebDAVStorage : public StorageBase
{
public:
    WebDAVStorage(const Poco::URI& uri,
                  const std::string& localStorePath,
                  const std::string& jailPath,
                  std::unique_ptr<AuthBase> authAgent) :
        StorageBase(uri, localStorePath, jailPath),
        _authAgent(std::move(authAgent))
    {
        LOG_INF("WebDAVStorage ctor with localStorePath: [" << localStorePath <<
                "], jailPath: [" << jailPath << "], uri: [" << uri.toString() << "].");
    }

    // Implement me
    // WebDAVFileInfo getWebDAVFileInfo(const Poco::URI& uriPublic);

    std::string loadStorageFileToLocal() override;

    SaveResult saveLocalFileToStorage(const Poco::URI& uriPublic) override;

private:
    std::unique_ptr<AuthBase> _authAgent;
};

#endif

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