/* 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.
 *
 */

#define FORBIDDEN_SYMBOL_ALLOW_ALL

#include "backends/cloud/onedrive/onedrivestorage.h"
#include "backends/cloud/cloudmanager.h"
#include "backends/cloud/onedrive/onedrivecreatedirectoryrequest.h"
#include "backends/cloud/onedrive/onedrivetokenrefresher.h"
#include "backends/cloud/onedrive/onedrivelistdirectoryrequest.h"
#include "backends/cloud/onedrive/onedriveuploadrequest.h"
#include "backends/networking/curl/connectionmanager.h"
#include "backends/networking/curl/curljsonrequest.h"
#include "backends/networking/curl/networkreadstream.h"
#include "common/config-manager.h"
#include "common/debug.h"
#include "common/json.h"
#include <curl/curl.h>

#ifdef ENABLE_RELEASE
#include "dists/clouds/cloud_keys.h"
#endif

namespace Cloud {
namespace OneDrive {

#define ONEDRIVE_OAUTH2_TOKEN "https://login.live.com/oauth20_token.srf"
#define ONEDRIVE_API_SPECIAL_APPROOT_ID "https://api.onedrive.com/v1.0/drive/special/approot:/"
#define ONEDRIVE_API_SPECIAL_APPROOT "https://api.onedrive.com/v1.0/drive/special/approot"

char *OneDriveStorage::KEY = nullptr; //can't use CloudConfig there yet, loading it on instance creation/auth
char *OneDriveStorage::SECRET = nullptr;

void OneDriveStorage::loadKeyAndSecret() {
#ifdef ENABLE_RELEASE
	KEY = RELEASE_ONEDRIVE_KEY;
	SECRET = RELEASE_ONEDRIVE_SECRET;
#else
	Common::String k = ConfMan.get("ONEDRIVE_KEY", ConfMan.kCloudDomain);
	KEY = new char[k.size() + 1];
	memcpy(KEY, k.c_str(), k.size());
	KEY[k.size()] = 0;

	k = ConfMan.get("ONEDRIVE_SECRET", ConfMan.kCloudDomain);
	SECRET = new char[k.size() + 1];
	memcpy(SECRET, k.c_str(), k.size());
	SECRET[k.size()] = 0;
#endif
}

OneDriveStorage::OneDriveStorage(Common::String accessToken, Common::String userId, Common::String refreshToken):
	_token(accessToken), _uid(userId), _refreshToken(refreshToken) {}

OneDriveStorage::OneDriveStorage(Common::String code) {
	getAccessToken(
		new Common::Callback<OneDriveStorage, BoolResponse>(this, &OneDriveStorage::codeFlowComplete),
		new Common::Callback<OneDriveStorage, Networking::ErrorResponse>(this, &OneDriveStorage::codeFlowFailed),
		code
	);
}

OneDriveStorage::~OneDriveStorage() {}

void OneDriveStorage::getAccessToken(BoolCallback callback, Networking::ErrorCallback errorCallback, Common::String code) {
	if (!KEY || !SECRET)
		loadKeyAndSecret();
	bool codeFlow = (code != "");

	if (!codeFlow && _refreshToken == "") {
		warning("OneDriveStorage: no refresh token available to get new access token.");
		if (callback)
			(*callback)(BoolResponse(nullptr, false));
		return;
	}

	Networking::JsonCallback innerCallback = new Common::CallbackBridge<OneDriveStorage, BoolResponse, Networking::JsonResponse>(this, &OneDriveStorage::tokenRefreshed, callback);
	if (errorCallback == nullptr)
		errorCallback = getErrorPrintingCallback();
	Networking::CurlJsonRequest *request = new Networking::CurlJsonRequest(innerCallback, errorCallback, ONEDRIVE_OAUTH2_TOKEN);
	if (codeFlow) {
		request->addPostField("code=" + code);
		request->addPostField("grant_type=authorization_code");
	} else {
		request->addPostField("refresh_token=" + _refreshToken);
		request->addPostField("grant_type=refresh_token");
	}
	request->addPostField("client_id=" + Common::String(KEY));
	request->addPostField("client_secret=" + Common::String(SECRET));
	if (Cloud::CloudManager::couldUseLocalServer()) {
		request->addPostField("&redirect_uri=http%3A%2F%2Flocalhost%3A12345%2F");
	} else {
		request->addPostField("&redirect_uri=https%3A%2F%2Fwww.scummvm.org/c/code");
	}
	addRequest(request);
}

void OneDriveStorage::tokenRefreshed(BoolCallback callback, Networking::JsonResponse response) {
	Common::JSONValue *json = response.value;
	if (!json) {
		warning("OneDriveStorage: got NULL instead of JSON");
		if (callback)
			(*callback)(BoolResponse(nullptr, false));
		delete callback;
		return;
	}

	if (!Networking::CurlJsonRequest::jsonIsObject(json, "OneDriveStorage")) {
		if (callback)
			(*callback)(BoolResponse(nullptr, false));
		delete json;
		delete callback;
		return;
	}

	Common::JSONObject result = json->asObject();
	if (!Networking::CurlJsonRequest::jsonContainsString(result, "access_token", "OneDriveStorage") ||
		!Networking::CurlJsonRequest::jsonContainsString(result, "user_id", "OneDriveStorage") ||
		!Networking::CurlJsonRequest::jsonContainsString(result, "refresh_token", "OneDriveStorage")) {
		warning("OneDriveStorage: bad response, no token or user_id passed");
		debug(9, "%s", json->stringify().c_str());
		if (callback)
			(*callback)(BoolResponse(nullptr, false));
	} else {
		_token = result.getVal("access_token")->asString();
		_uid = result.getVal("user_id")->asString();
		_refreshToken = result.getVal("refresh_token")->asString();
		CloudMan.save(); //ask CloudManager to save our new refreshToken
		if (callback)
			(*callback)(BoolResponse(nullptr, true));
	}
	delete json;
	delete callback;
}

void OneDriveStorage::codeFlowComplete(BoolResponse response) {
	if (!response.value) {
		warning("OneDriveStorage: failed to get access token through code flow");
		CloudMan.removeStorage(this);
		return;
	}

	ConfMan.removeKey("onedrive_code", ConfMan.kCloudDomain);
	CloudMan.replaceStorage(this, kStorageOneDriveId);
	ConfMan.flushToDisk();
}

void OneDriveStorage::codeFlowFailed(Networking::ErrorResponse error) {
	debug(9, "OneDriveStorage: code flow failed (%s, %ld):", (error.failed ? "failed" : "interrupted"), error.httpResponseCode);
	debug(9, "%s", error.response.c_str());
	CloudMan.removeStorage(this);
}

void OneDriveStorage::saveConfig(Common::String keyPrefix) {
	ConfMan.set(keyPrefix + "access_token", _token, ConfMan.kCloudDomain);
	ConfMan.set(keyPrefix + "user_id", _uid, ConfMan.kCloudDomain);
	ConfMan.set(keyPrefix + "refresh_token", _refreshToken, ConfMan.kCloudDomain);
}

Common::String OneDriveStorage::name() const {
	return "OneDrive";
}

void OneDriveStorage::infoInnerCallback(StorageInfoCallback outerCallback, Networking::JsonResponse response) {
	Common::JSONValue *json = response.value;
	if (!json) {
		warning("OneDriveStorage::infoInnerCallback: NULL passed instead of JSON");
		delete outerCallback;
		return;
	}

	if (!Networking::CurlJsonRequest::jsonIsObject(json, "OneDriveStorage::infoInnerCallback")) {
		delete json;
		delete outerCallback;
		return;
	}

	Common::JSONObject info = json->asObject();

	Common::String uid, name, email;
	uint64 quotaUsed = 0, quotaAllocated = 26843545600LL; // 25 GB, because I actually don't know any way to find out the real one

	if (Networking::CurlJsonRequest::jsonContainsObject(info, "createdBy", "OneDriveStorage::infoInnerCallback")) {
		Common::JSONObject createdBy = info.getVal("createdBy")->asObject();
		if (Networking::CurlJsonRequest::jsonContainsObject(createdBy, "user", "OneDriveStorage::infoInnerCallback")) {
			Common::JSONObject user = createdBy.getVal("user")->asObject();
			if (Networking::CurlJsonRequest::jsonContainsString(user, "id", "OneDriveStorage::infoInnerCallback"))
				uid = user.getVal("id")->asString();
			if (Networking::CurlJsonRequest::jsonContainsString(user, "displayName", "OneDriveStorage::infoInnerCallback"))
				name = user.getVal("displayName")->asString();
		}
	}

	if (Networking::CurlJsonRequest::jsonContainsIntegerNumber(info, "size", "OneDriveStorage::infoInnerCallback")) {
		quotaUsed = info.getVal("size")->asIntegerNumber();
	}

	Common::String username = email;
	if (username == "")
		username = name;
	if (username == "")
		username = uid;
	CloudMan.setStorageUsername(kStorageOneDriveId, username);

	if (outerCallback) {
		(*outerCallback)(StorageInfoResponse(nullptr, StorageInfo(uid, name, email, quotaUsed, quotaAllocated)));
		delete outerCallback;
	}

	delete json;
}

void OneDriveStorage::fileInfoCallback(Networking::NetworkReadStreamCallback outerCallback, Networking::JsonResponse response) {
	Common::JSONValue *json = response.value;
	if (!json) {
		warning("OneDriveStorage::fileInfoCallback: NULL passed instead of JSON");
		if (outerCallback)
			(*outerCallback)(Networking::NetworkReadStreamResponse(response.request, nullptr));
		delete outerCallback;
		return;
	}

	if (!Networking::CurlJsonRequest::jsonIsObject(json, "OneDriveStorage::fileInfoCallback")) {
		if (outerCallback)
			(*outerCallback)(Networking::NetworkReadStreamResponse(response.request, nullptr));
		delete json;
		delete outerCallback;
		return;
	}

	Common::JSONObject result = response.value->asObject();
	if (!Networking::CurlJsonRequest::jsonContainsString(result, "@content.downloadUrl", "OneDriveStorage::fileInfoCallback")) {
		warning("OneDriveStorage: downloadUrl not found in passed JSON");
		debug(9, "%s", response.value->stringify().c_str());
		if (outerCallback)
			(*outerCallback)(Networking::NetworkReadStreamResponse(response.request, nullptr));
		delete json;
		delete outerCallback;
		return;
	}

	const char *url = result.getVal("@content.downloadUrl")->asString().c_str();
	if (outerCallback)
		(*outerCallback)(Networking::NetworkReadStreamResponse(
			response.request,
			new Networking::NetworkReadStream(url, nullptr, "")
		));

	delete json;
	delete outerCallback;
}

Networking::Request *OneDriveStorage::listDirectory(Common::String path, ListDirectoryCallback callback, Networking::ErrorCallback errorCallback, bool recursive) {
	return addRequest(new OneDriveListDirectoryRequest(this, path, callback, errorCallback, recursive));
}

Networking::Request *OneDriveStorage::upload(Common::String path, Common::SeekableReadStream *contents, UploadCallback callback, Networking::ErrorCallback errorCallback) {
	return addRequest(new OneDriveUploadRequest(this, path, contents, callback, errorCallback));
}

Networking::Request *OneDriveStorage::streamFileById(Common::String path, Networking::NetworkReadStreamCallback outerCallback, Networking::ErrorCallback errorCallback) {
	Common::String url = ONEDRIVE_API_SPECIAL_APPROOT_ID + ConnMan.urlEncode(path);
	Networking::JsonCallback innerCallback = new Common::CallbackBridge<OneDriveStorage, Networking::NetworkReadStreamResponse, Networking::JsonResponse>(this, &OneDriveStorage::fileInfoCallback, outerCallback);
	Networking::CurlJsonRequest *request = new OneDriveTokenRefresher(this, innerCallback, errorCallback, url.c_str());
	request->addHeader("Authorization: Bearer " + _token);
	return addRequest(request);
}

Networking::Request *OneDriveStorage::createDirectory(Common::String path, BoolCallback callback, Networking::ErrorCallback errorCallback) {
	if (!errorCallback)
		errorCallback = getErrorPrintingCallback();
	return addRequest(new OneDriveCreateDirectoryRequest(this, path, callback, errorCallback));
}

Networking::Request *OneDriveStorage::info(StorageInfoCallback callback, Networking::ErrorCallback errorCallback) {
	Networking::JsonCallback innerCallback = new Common::CallbackBridge<OneDriveStorage, StorageInfoResponse, Networking::JsonResponse>(this, &OneDriveStorage::infoInnerCallback, callback);
	Networking::CurlJsonRequest *request = new OneDriveTokenRefresher(this, innerCallback, errorCallback, ONEDRIVE_API_SPECIAL_APPROOT);
	request->addHeader("Authorization: bearer " + _token);
	return addRequest(request);
}

Common::String OneDriveStorage::savesDirectoryPath() { return "saves/"; }

OneDriveStorage *OneDriveStorage::loadFromConfig(Common::String keyPrefix) {
	loadKeyAndSecret();

	if (!ConfMan.hasKey(keyPrefix + "access_token", ConfMan.kCloudDomain)) {
		warning("OneDriveStorage: no access_token found");
		return nullptr;
	}

	if (!ConfMan.hasKey(keyPrefix + "user_id", ConfMan.kCloudDomain)) {
		warning("OneDriveStorage: no user_id found");
		return nullptr;
	}

	if (!ConfMan.hasKey(keyPrefix + "refresh_token", ConfMan.kCloudDomain)) {
		warning("OneDriveStorage: no refresh_token found");
		return nullptr;
	}

	Common::String accessToken = ConfMan.get(keyPrefix + "access_token", ConfMan.kCloudDomain);
	Common::String userId = ConfMan.get(keyPrefix + "user_id", ConfMan.kCloudDomain);
	Common::String refreshToken = ConfMan.get(keyPrefix + "refresh_token", ConfMan.kCloudDomain);
	return new OneDriveStorage(accessToken, userId, refreshToken);
}

} // End of namespace OneDrive
} // End of namespace Cloud