/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/

#include "backends/cloud/dropbox/dropboxlistdirectoryrequest.h"
#include "backends/cloud/iso8601.h"
#include "backends/cloud/storage.h"
#include "backends/networking/curl/connectionmanager.h"
#include "backends/networking/curl/curljsonrequest.h"
#include "backends/networking/curl/networkreadstream.h"
#include "common/json.h"

namespace Cloud {
namespace Dropbox {

DropboxListDirectoryRequest::DropboxListDirectoryRequest(Common::String token, Common::String path, Storage::ListDirectoryCallback cb, Networking::ErrorCallback ecb, bool recursive):
	Networking::Request(nullptr, ecb), _requestedPath(path), _requestedRecursive(recursive), _listDirectoryCallback(cb),
	_token(token), _workingRequest(nullptr), _ignoreCallback(false) {
	start();
}

DropboxListDirectoryRequest::~DropboxListDirectoryRequest() {
	_ignoreCallback = true;
	if (_workingRequest) _workingRequest->finish();
	delete _listDirectoryCallback;
}

void DropboxListDirectoryRequest::start() {
	_ignoreCallback = true;
	if (_workingRequest) _workingRequest->finish();
	_files.clear();
	_ignoreCallback = false;

	Networking::JsonCallback callback = new Common::Callback<DropboxListDirectoryRequest, Networking::JsonResponse>(this, &DropboxListDirectoryRequest::responseCallback);
	Networking::ErrorCallback failureCallback = new Common::Callback<DropboxListDirectoryRequest, Networking::ErrorResponse>(this, &DropboxListDirectoryRequest::errorCallback);
	Networking::CurlJsonRequest *request = new Networking::CurlJsonRequest(callback, failureCallback, "https://api.dropboxapi.com/2/files/list_folder");
	request->addHeader("Authorization: Bearer " + _token);
	request->addHeader("Content-Type: application/json");

	Common::JSONObject jsonRequestParameters;
	jsonRequestParameters.setVal("path", new Common::JSONValue(_requestedPath));
	jsonRequestParameters.setVal("recursive", new Common::JSONValue(_requestedRecursive));
	jsonRequestParameters.setVal("include_media_info", new Common::JSONValue(false));
	jsonRequestParameters.setVal("include_deleted", new Common::JSONValue(false));

	Common::JSONValue value(jsonRequestParameters);
	request->addPostField(Common::JSON::stringify(&value));

	_workingRequest = ConnMan.addRequest(request);
}

void DropboxListDirectoryRequest::responseCallback(Networking::JsonResponse response) {
	_workingRequest = nullptr;
	if (_ignoreCallback) return;

	Networking::ErrorResponse error(this);
	Networking::CurlJsonRequest *rq = (Networking::CurlJsonRequest *)response.request;
	if (rq && rq->getNetworkReadStream())
		error.httpResponseCode = rq->getNetworkReadStream()->httpResponseCode();

	Common::JSONValue *json = response.value;
	if (json) {
		Common::JSONObject responseObjecct = json->asObject();
		
		if (responseObjecct.contains("error") || responseObjecct.contains("error_summary")) {
			warning("Dropbox returned error: %s", responseObjecct.getVal("error_summary")->asString().c_str());
			error.failed = true;
			error.response = json->stringify();
			finishError(error);
			delete json;
			return;
		}

		//TODO: check that ALL keys exist AND HAVE RIGHT TYPE to avoid segfaults		

		if (responseObjecct.contains("entries")) {
			Common::JSONArray items = responseObjecct.getVal("entries")->asArray();
			for (uint32 i = 0; i < items.size(); ++i) {
				Common::JSONObject item = items[i]->asObject();
				Common::String path = item.getVal("path_lower")->asString();
				bool isDirectory = (item.getVal(".tag")->asString() == "folder");
				uint32 size = 0, timestamp = 0;
				if (!isDirectory) {
					size = item.getVal("size")->asIntegerNumber();
					timestamp = ISO8601::convertToTimestamp(item.getVal("server_modified")->asString());
				}
				_files.push_back(StorageFile(path, size, timestamp, isDirectory));
			}
		}

		bool hasMore = (responseObjecct.contains("has_more") && responseObjecct.getVal("has_more")->asBool());

		if (hasMore) {			
			Networking::JsonCallback callback = new Common::Callback<DropboxListDirectoryRequest, Networking::JsonResponse>(this, &DropboxListDirectoryRequest::responseCallback);
			Networking::ErrorCallback failureCallback = new Common::Callback<DropboxListDirectoryRequest, Networking::ErrorResponse>(this, &DropboxListDirectoryRequest::errorCallback);
			Networking::CurlJsonRequest *request = new Networking::CurlJsonRequest(callback, failureCallback, "https://api.dropboxapi.com/2/files/list_folder/continue");
			request->addHeader("Authorization: Bearer " + _token);
			request->addHeader("Content-Type: application/json");

			Common::JSONObject jsonRequestParameters;
			jsonRequestParameters.setVal("cursor", new Common::JSONValue(responseObjecct.getVal("cursor")->asString()));

			Common::JSONValue value(jsonRequestParameters);
			request->addPostField(Common::JSON::stringify(&value));

			_workingRequest = ConnMan.addRequest(request);
		} else {			
			finishSuccess(_files);
		}		
	} else {
		warning("null, not json");
		error.failed = true;
		finishError(error);
	}

	delete json;
}

void DropboxListDirectoryRequest::errorCallback(Networking::ErrorResponse error) {
	_workingRequest = nullptr;
	if (_ignoreCallback) return;
	finishError(error);
}

void DropboxListDirectoryRequest::handle() {}

void DropboxListDirectoryRequest::restart() { start(); }

void DropboxListDirectoryRequest::finishSuccess(Common::Array<StorageFile> &files) {	
	Request::finishSuccess();
	if (_listDirectoryCallback) (*_listDirectoryCallback)(Storage::ListDirectoryResponse(this, files));
}

} // End of namespace Dropbox
} // End of namespace Cloud