/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org

Telegram Desktop 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.

It 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.

In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.

Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
*/
#include "storage/storage_shared_media.h"

#include <rpl/map.h>
#include "base/task_queue.h"

namespace Storage {

std::map<PeerId, SharedMedia::Lists>::iterator
		SharedMedia::enforceLists(PeerId peer) {
	auto result = _lists.find(peer);
	if (result != _lists.end()) {
		return result;
	}
	result = _lists.emplace(peer, Lists {}).first;
	for (auto index = 0; index != kSharedMediaTypeCount; ++index) {
		auto &list = result->second[index];
		auto type = static_cast<SharedMediaType>(index);

		list.sliceUpdated()
			| rpl::map([=](const SparseIdsSliceUpdate &update) {
				return SharedMediaSliceUpdate(
					peer,
					type,
					update);
			})
			| rpl::start_to_stream(_sliceUpdated, _lifetime);
	}
	return result;
}

void SharedMedia::add(SharedMediaAddNew &&query) {
	auto peer = query.peerId;
	auto peerIt = enforceLists(peer);
	for (auto index = 0; index != kSharedMediaTypeCount; ++index) {
		auto type = static_cast<SharedMediaType>(index);
		if (query.types.test(type)) {
			peerIt->second[index].addNew(query.messageId);
		}
	}
}

void SharedMedia::add(SharedMediaAddExisting &&query) {
	auto peerIt = enforceLists(query.peerId);
	for (auto index = 0; index != kSharedMediaTypeCount; ++index) {
		auto type = static_cast<SharedMediaType>(index);
		if (query.types.test(type)) {
			peerIt->second[index].addExisting(query.messageId, query.noSkipRange);
		}
	}
}

void SharedMedia::add(SharedMediaAddSlice &&query) {
	Expects(IsValidSharedMediaType(query.type));
	auto peerIt = enforceLists(query.peerId);
	auto index = static_cast<int>(query.type);
	peerIt->second[index].addSlice(std::move(query.messageIds), query.noSkipRange, query.count);
}

void SharedMedia::remove(SharedMediaRemoveOne &&query) {
	auto peerIt = _lists.find(query.peerId);
	if (peerIt != _lists.end()) {
		for (auto index = 0; index != kSharedMediaTypeCount; ++index) {
			auto type = static_cast<SharedMediaType>(index);
			if (query.types.test(type)) {
				peerIt->second[index].removeOne(query.messageId);
				_oneRemoved.fire(std::move(query));
			}
		}
	}
}

void SharedMedia::remove(SharedMediaRemoveAll &&query) {
	auto peerIt = _lists.find(query.peerId);
	if (peerIt != _lists.end()) {
		for (auto index = 0; index != kSharedMediaTypeCount; ++index) {
			peerIt->second[index].removeAll();
		}
		_allRemoved.fire(std::move(query));
	}
}

rpl::producer<SharedMediaResult> SharedMedia::query(SharedMediaQuery &&query) const {
	Expects(IsValidSharedMediaType(query.key.type));
	auto peerIt = _lists.find(query.key.peerId);
	if (peerIt != _lists.end()) {
		auto index = static_cast<int>(query.key.type);
		return peerIt->second[index].query(SparseIdsListQuery(
			query.key.messageId,
			query.limitBefore,
			query.limitAfter));
	}
	return [](auto consumer) {
		consumer.put_done();
		return rpl::lifetime();
	};
}

} // namespace Storage