/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.

For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
*/
#include "info/profile/info_profile_values.h"

#include <rpl/filter.h>
#include <rpl/range.h>
#include <rpl/then.h>
#include <rpl/combine.h>
#include "observer_peer.h"
#include "messenger.h"
#include "auth_session.h"
#include "ui/wrap/slide_wrap.h"
#include "data/data_peer_values.h"
#include "data/data_shared_media.h"
#include "data/data_feed.h"
#include "data/data_session.h"

namespace Info {
namespace Profile {

rpl::producer<TextWithEntities> PhoneValue(
		not_null<UserData*> user) {
	return Notify::PeerUpdateValue(
			user,
			Notify::PeerUpdate::Flag::UserPhoneChanged
	) | rpl::map([user] {
		return App::formatPhone(user->phone());
	}) | WithEmptyEntities();
}

auto PlainBioValue(
		not_null<UserData*> user) {
	return Notify::PeerUpdateValue(
			user,
			Notify::PeerUpdate::Flag::AboutChanged
	) | rpl::map([user] { return user->about(); });
}

rpl::producer<TextWithEntities> BioValue(
		not_null<UserData*> user) {
	return PlainBioValue(user)
		| ToSingleLine()
		| WithEmptyEntities();
}

auto PlainUsernameValue(
		not_null<PeerData*> peer) {
	return Notify::PeerUpdateValue(
			peer,
			Notify::PeerUpdate::Flag::UsernameChanged
	) | rpl::map([peer] {
		return peer->userName();
	});
}

rpl::producer<TextWithEntities> UsernameValue(
		not_null<UserData*> user) {
	return PlainUsernameValue(
		user
	) | rpl::map([](QString &&username) {
		return username.isEmpty()
			? QString()
			: ('@' + username);
	}) | WithEmptyEntities();
}

rpl::producer<QString> PlainAboutValue(
		not_null<PeerData*> peer) {
	if (auto channel = peer->asChannel()) {
		return Notify::PeerUpdateValue(
				channel,
				Notify::PeerUpdate::Flag::AboutChanged
		) | rpl::map([channel] { return channel->about(); });
	} else if (auto user = peer->asUser()) {
		if (user->botInfo) {
			return PlainBioValue(user);
		}
	}
	return rpl::single(QString());
}


rpl::producer<TextWithEntities> AboutValue(
		not_null<PeerData*> peer) {
	auto flags = TextParseLinks
		| TextParseMentions
		| TextParseHashtags;
	if (peer->isUser()) {
		flags |= TextParseBotCommands;
	}
	return PlainAboutValue(
		peer
	) | WithEmptyEntities(
	) | rpl::map([=](TextWithEntities &&text) {
		TextUtilities::ParseEntities(text, flags);
		return std::move(text);
	});
}

rpl::producer<QString> LinkValue(
		not_null<PeerData*> peer) {
	return PlainUsernameValue(
		peer
	) | rpl::map([](QString &&username) {
		return username.isEmpty()
			? QString()
			: Messenger::Instance().createInternalLinkFull(username);
	});
}

rpl::producer<bool> NotificationsEnabledValue(
		not_null<PeerData*> peer) {
	return Notify::PeerUpdateValue(
			peer,
			Notify::PeerUpdate::Flag::NotificationsEnabled
	) | rpl::map([peer] {
		return !peer->isMuted();
	}) | rpl::distinct_until_changed();
}

rpl::producer<bool> IsContactValue(
		not_null<UserData*> user) {
	return Notify::PeerUpdateValue(
			user,
			Notify::PeerUpdate::Flag::UserIsContact
	) | rpl::map([user] { return user->isContact(); });
}

rpl::producer<bool> CanInviteBotToGroupValue(
		not_null<UserData*> user) {
	if (!user->botInfo) {
		return rpl::single(false);
	}
	return Notify::PeerUpdateValue(
			user,
			Notify::PeerUpdate::Flag::BotCanAddToGroups
	) | rpl::map([user] {
		return !user->botInfo->cantJoinGroups;
	});
}

rpl::producer<bool> CanShareContactValue(
		not_null<UserData*> user) {
	return Notify::PeerUpdateValue(
			user,
			Notify::PeerUpdate::Flag::UserCanShareContact
	) | rpl::map([user] {
		return user->canShareThisContact();
	});
}

rpl::producer<bool> CanAddContactValue(
		not_null<UserData*> user) {
	using namespace rpl::mappers;
	return rpl::combine(
			IsContactValue(user),
			CanShareContactValue(user),
			!_1 && _2);
}

rpl::producer<bool> AmInChannelValue(
		not_null<ChannelData*> channel) {
	return Notify::PeerUpdateValue(
		channel,
		Notify::PeerUpdate::Flag::ChannelAmIn
	) | rpl::map([channel] { return channel->amIn(); });
}

rpl::producer<int> MembersCountValue(
		not_null<PeerData*> peer) {
	if (auto chat = peer->asChat()) {
		return Notify::PeerUpdateValue(
			peer,
			Notify::PeerUpdate::Flag::MembersChanged
		) | rpl::map([chat] {
			return chat->amIn()
				? std::max(chat->count, int(chat->participants.size()))
				: 0;
		});
	} else if (auto channel = peer->asChannel()) {
		return Notify::PeerUpdateValue(
				channel,
				Notify::PeerUpdate::Flag::MembersChanged
		) | rpl::map([channel] {
			return channel->membersCount();
		});
	}
	Unexpected("User in MembersCountViewer().");
}

rpl::producer<int> AdminsCountValue(
		not_null<ChannelData*> channel) {
	using Flag = Notify::PeerUpdate::Flag;
	return Notify::PeerUpdateValue(
		channel,
		Flag::AdminsChanged | Flag::ChannelRightsChanged
	) | rpl::map([channel] {
		return channel->canViewAdmins()
			? channel->adminsCount()
			: 0;
	});
}

rpl::producer<int> RestrictedCountValue(
		not_null<ChannelData*> channel) {
	using Flag = Notify::PeerUpdate::Flag;
	return Notify::PeerUpdateValue(
		channel,
		Flag::BannedUsersChanged | Flag::ChannelRightsChanged
	) | rpl::map([channel] {
		return channel->canViewBanned()
			? channel->restrictedCount()
			: 0;
	});
}

rpl::producer<int> KickedCountValue(
		not_null<ChannelData*> channel) {
	using Flag = Notify::PeerUpdate::Flag;
	return Notify::PeerUpdateValue(
		channel,
		Flag::BannedUsersChanged | Flag::ChannelRightsChanged
	) | rpl::map([channel] {
		return channel->canViewBanned()
			? channel->kickedCount()
			: 0;
	});
}

rpl::producer<int> SharedMediaCountValue(
		not_null<PeerData*> peer,
		PeerData *migrated,
		Storage::SharedMediaType type) {
	auto aroundId = 0;
	auto limit = 0;
	auto updated = SharedMediaMergedViewer(
		SharedMediaMergedKey(
			SparseIdsMergedSlice::Key(
				peer->id,
				migrated ? migrated->id : 0,
				aroundId),
			type),
		limit,
		limit
	) | rpl::map([](const SparseIdsMergedSlice &slice) {
		return slice.fullCount();
	}) | rpl::filter_optional();
	return rpl::single(0) | rpl::then(std::move(updated));
}

rpl::producer<int> CommonGroupsCountValue(
		not_null<UserData*> user) {
	return Notify::PeerUpdateValue(
		user,
		Notify::PeerUpdate::Flag::UserCommonChatsChanged
	) | rpl::map([user] {
		return user->commonChatsCount();
	});
}

rpl::producer<bool> CanAddMemberValue(
		not_null<PeerData*> peer) {
	if (auto chat = peer->asChat()) {
		return Notify::PeerUpdateValue(
			chat,
			Notify::PeerUpdate::Flag::ChatCanEdit
		) | rpl::map([chat] {
			return chat->canEdit();
		});
	} else if (auto channel = peer->asChannel()) {
		return Notify::PeerUpdateValue(
			channel,
			Notify::PeerUpdate::Flag::ChannelRightsChanged
		) | rpl::map([channel] {
			return channel->canAddMembers();
		});
	}
	return rpl::single(false);
}

rpl::producer<bool> VerifiedValue(
		not_null<PeerData*> peer) {
	if (auto user = peer->asUser()) {
		return Data::PeerFlagValue(user, MTPDuser::Flag::f_verified);
	} else if (auto channel = peer->asChannel()) {
		return Data::PeerFlagValue(
			channel,
			MTPDchannel::Flag::f_verified);
	}
	return rpl::single(false);
}

rpl::producer<int> FeedChannelsCountValue(
		not_null<Data::Feed*> feed) {
	using Flag = Data::FeedUpdateFlag;
	return rpl::single(
		Data::FeedUpdate{ feed, Flag::Channels }
	) | rpl::then(
		Auth().data().feedUpdated()
	) | rpl::filter([=](const Data::FeedUpdate &update) {
		return (update.feed == feed) && (update.flag == Flag::Channels);
	}) | rpl::filter([=] {
		return feed->channelsLoaded();
	}) | rpl::map([=] {
		return int(feed->channels().size());
	}) | rpl::distinct_until_changed();
}


} // namespace Profile
} // namespace Info