/* 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#include "backends/cloud/box/boxlistdirectorybyidrequest.h"
#include "backends/cloud/box/boxstorage.h"
#include "backends/cloud/box/boxtokenrefresher.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 Box {

#define BOX_LIST_DIRECTORY_LIMIT 1000
#define BOX_FOLDERS_API_LINK "https://api.box.com/2.0/folders/%s/items?offset=%u&limit=%u&fields=%s"

BoxListDirectoryByIdRequest::BoxListDirectoryByIdRequest(BoxStorage *storage, Common::String id, Storage::ListDirectoryCallback cb, Networking::ErrorCallback ecb):
	Networking::Request(nullptr, ecb), _requestedId(id), _storage(storage), _listDirectoryCallback(cb),
	_workingRequest(nullptr), _ignoreCallback(false) {
	start();
}

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

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

	makeRequest(0);
}

void BoxListDirectoryByIdRequest::makeRequest(uint32 offset) {
	Common::String url = Common::String::format(
		BOX_FOLDERS_API_LINK,
		_requestedId.c_str(),
		offset,
		BOX_LIST_DIRECTORY_LIMIT,
		"id,type,name,size,modified_at"
	);

	Networking::JsonCallback callback = new Common::Callback<BoxListDirectoryByIdRequest, Networking::JsonResponse>(this, &BoxListDirectoryByIdRequest::responseCallback);
	Networking::ErrorCallback failureCallback = new Common::Callback<BoxListDirectoryByIdRequest, Networking::ErrorResponse>(this, &BoxListDirectoryByIdRequest::errorCallback);
	Networking::CurlJsonRequest *request = new BoxTokenRefresher(_storage, callback, failureCallback, url.c_str());
	request->addHeader("Authorization: Bearer " + _storage->accessToken());
	_workingRequest = ConnMan.addRequest(request);
}

void BoxListDirectoryByIdRequest::responseCallback(Networking::JsonResponse response) {
	_workingRequest = nullptr;
	if (_ignoreCallback) {
		delete response.value;
		return;
	}

	if (response.request)
		_date = response.request->date();

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

	Common::JSONValue *json = response.value;
	if (json == nullptr) {
		error.response = "Failed to parse JSON, null passed!";
		finishError(error);
		return;
	}

	if (!json->isObject()) {
		error.response = "Passed JSON is not an object!";
		finishError(error);
		delete json;
		return;
	}

	Common::JSONObject responseObject = json->asObject();
	//debug(9, "%s", json->stringify(true).c_str());

	//TODO: handle error messages passed as JSON
	/*
	if (responseObject.contains("error") || responseObject.contains("error_summary")) {
		warning("Box returned error: %s", responseObject.getVal("error_summary")->asString().c_str());
		error.failed = true;
		error.response = json->stringify();
		finishError(error);
		delete json;
		return;
	}
	*/

	//check that ALL keys exist AND HAVE RIGHT TYPE to avoid segfaults
	if (responseObject.contains("entries")) {
		if (!responseObject.getVal("entries")->isArray()) {
			error.response = Common::String::format(
				"\"entries\" found, but that's not an array!\n%s",
				responseObject.getVal("entries")->stringify(true).c_str()
			);
			finishError(error);
			delete json;
			return;
		}

		Common::JSONArray items = responseObject.getVal("entries")->asArray();
		for (uint32 i = 0; i < items.size(); ++i) {
			if (!Networking::CurlJsonRequest::jsonIsObject(items[i], "BoxListDirectoryByIdRequest")) continue;

			Common::JSONObject item = items[i]->asObject();

			if (!Networking::CurlJsonRequest::jsonContainsString(item, "id", "BoxListDirectoryByIdRequest")) continue;
			if (!Networking::CurlJsonRequest::jsonContainsString(item, "name", "BoxListDirectoryByIdRequest")) continue;
			if (!Networking::CurlJsonRequest::jsonContainsString(item, "type", "BoxListDirectoryByIdRequest")) continue;
			if (!Networking::CurlJsonRequest::jsonContainsString(item, "modified_at", "BoxListDirectoryByIdRequest")) continue;
			if (!Networking::CurlJsonRequest::jsonContainsStringOrIntegerNumber(item, "size", "BoxListDirectoryByIdRequest")) continue;

			Common::String id = item.getVal("id")->asString();
			Common::String name = item.getVal("name")->asString();
			bool isDirectory = (item.getVal("type")->asString() == "folder");
			uint32 size;
			if (item.getVal("size")->isString()) {
				size = item.getVal("size")->asString().asUint64();
			} else {
				size = item.getVal("size")->asIntegerNumber();
			}
			uint32 timestamp = ISO8601::convertToTimestamp(item.getVal("modified_at")->asString());

			//as we list directory by id, we can't determine full path for the file, so we leave it empty
			_files.push_back(StorageFile(id, "", name, size, timestamp, isDirectory));
		}
	}

	uint32 received = 0;
	uint32 totalCount = 0;
	if (responseObject.contains("total_count") && responseObject.getVal("total_count")->isIntegerNumber())
		totalCount = responseObject.getVal("total_count")->asIntegerNumber();
	if (responseObject.contains("offset") && responseObject.getVal("offset")->isIntegerNumber())
		received = responseObject.getVal("offset")->asIntegerNumber();
	if (responseObject.contains("limit") && responseObject.getVal("limit")->isIntegerNumber())
		received += responseObject.getVal("limit")->asIntegerNumber();
	bool hasMore = (received < totalCount);

	if (hasMore) makeRequest(received);
	else finishListing(_files);

	delete json;
}

void BoxListDirectoryByIdRequest::errorCallback(Networking::ErrorResponse error) {
	_workingRequest = nullptr;
	if (_ignoreCallback) return;
	if (error.request) _date = error.request->date();
	finishError(error);
}

void BoxListDirectoryByIdRequest::handle() {}

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

Common::String BoxListDirectoryByIdRequest::date() const { return _date; }

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

} // End of namespace Box
} // End of namespace Cloud
