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Telegram/SourceFiles/api/api_single_message_search.h

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+/*
+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
+*/
+#pragma once
+
+namespace Main {
+class Session;
+} // namespace Main
+
+namespace Api {
+namespace details {
+
+struct SingleMessageSearchKey {
+	QString domainOrId;
+	MsgId postId = 0;
+
+	[[nodiscard]] bool empty() const {
+		return domainOrId.isEmpty() || !postId;
+	}
+	[[nodiscard]] explicit operator bool() const {
+		return !empty();
+	}
+	[[nodiscard]] bool operator<(const SingleMessageSearchKey &other) const {
+		return std::tie(domainOrId, postId)
+			< std::tie(other.domainOrId, other.postId);
+	}
+	[[nodiscard]] bool operator==(
+			const SingleMessageSearchKey &other) const {
+		return std::tie(domainOrId, postId)
+			== std::tie(other.domainOrId, other.postId);
+	}
+};
+
+} // namespace details
+
+class SingleMessageSearch {
+public:
+	explicit SingleMessageSearch(not_null<Main::Session*> session);
+	~SingleMessageSearch();
+
+	void clear();
+
+	// If 'ready' callback is empty, the result must not be 'nullopt'.
+	[[nodiscard]] std::optional<HistoryItem*> lookup(
+		const QString &query,
+		Fn<void()> ready = nullptr);
+
+private:
+	using Key = details::SingleMessageSearchKey;
+
+	[[nodiscard]] std::optional<HistoryItem*> performLookup(
+		Fn<void()> ready);
+	[[nodiscard]] std::optional<HistoryItem*> performLookupById(
+		ChannelId channelId,
+		Fn<void()> ready);
+	[[nodiscard]] std::optional<HistoryItem*> performLookupByUsername(
+		const QString &username,
+		Fn<void()> ready);
+	[[nodiscard]] std::optional<HistoryItem*> performLookupByChannel(
+		not_null<ChannelData*> channel,
+		Fn<void()> ready);
+
+	const not_null<Main::Session*> _session;
+	std::map<Key, FullMsgId> _cache;
+	mtpRequestId _requestId = 0;
+	Key _requestKey;
+
+};
+
+[[nodiscard]] QString ConvertPeerSearchQuery(const QString &query);
+
+} // namespace Api