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// SPDX-FileCopyrightText: 2021 Kitsune Ral <kitsune-ral@users.sf.net>
// SPDX-License-Identifier: LGPL-2.1-or-later
#pragma once
#include "events/stateevent.h"
#include <QtCore/QHash>
namespace Quotient {
class Room;
// NB: Both concepts below expect EvT::needsStateKey to exist so you can't
// express one via negation of the other (there's still an invalid case of
// a non-state event where needsStateKey is not even defined).
template <typename FnT, class EvT = std::decay_t<fn_arg_t<FnT>>>
concept Keyed_State_Fn = EvT::needsStateKey;
template <typename FnT, class EvT = std::decay_t<fn_arg_t<FnT>>>
concept Keyless_State_Fn = !EvT::needsStateKey;
class QUOTIENT_API RoomStateView
: private QHash<StateEventKey, const StateEvent*> {
Q_GADGET
public:
const QHash<StateEventKey, const StateEvent*>& events() const
{
return *this;
}
//! \brief Get a state event with the given event type and state key
//! \return A state event corresponding to the pair of event type
//! \p evtType and state key \p stateKey, or nullptr if there's
//! no such \p evtType / \p stateKey combination in the current
//! state.
//! \warning In libQuotient 0.7 the return type changed to an OmittableCref
//! which is effectively a nullable const reference wrapper. You
//! have to check that it has_value() before using. Alternatively
//! you can now use queryCurrentState() to access state safely.
//! \sa getCurrentStateContentJson
const StateEvent* get(const QString& evtType,
const QString& stateKey = {}) const;
//! \brief Get a state event with the given event type and state key
//!
//! This is a typesafe overload that accepts a C++ event type instead of
//! its Matrix name. It is only defined for events with state key (i.e.,
//! derived from KeyedStateEvent).
template <Keyed_State_Event EvT>
const EvT* get(const QString& stateKey = {}) const
{
if (const auto* evt = get(EvT::TypeId, stateKey)) {
Q_ASSERT(evt->matrixType() == EvT::TypeId
&& evt->stateKey() == stateKey);
return eventCast<const EvT>(evt);
}
return nullptr;
}
//! \brief Get a state event with the given event type
//!
//! This is a typesafe overload that accepts a C++ event type instead of
//! its Matrix name. This overload only defined for events that do not use
//! state key (i.e., derived from KeylessStateEvent).
template <Keyless_State_Event EvT>
const EvT* get() const
{
if (const auto* evt = get(EvT::TypeId)) {
Q_ASSERT(evt->matrixType() == EvT::TypeId);
return eventCast<const EvT>(evt);
}
return nullptr;
}
using QHash::contains;
bool contains(const QString& evtType, const QString& stateKey = {}) const;
template <Keyed_State_Event EvT>
bool contains(const QString& stateKey = {}) const
{
return contains(EvT::TypeId, stateKey);
}
template <Keyless_State_Event EvT>
bool contains() const
{
return contains(EvT::TypeId);
}
template <Keyed_State_Event EvT>
auto content(const QString& stateKey,
typename EvT::content_type defaultValue = {}) const
{
// EventBase<>::content is special in that it returns a const-ref,
// and lift() inside queryOr() can't wrap that in a temporary Omittable.
if (const auto evt = get<EvT>(stateKey))
return evt->content();
return std::move(defaultValue);
}
template <Keyless_State_Event EvT>
auto content(typename EvT::content_type defaultValue = {}) const
{
// Same as above
if (const auto evt = get<EvT>())
return evt->content();
return defaultValue;
}
//! \brief Get the content of the current state event with the given
//! event type and state key
//! \return An empty object if there's no event in the current state with
//! this event type and state key; the contents of the event
//! <tt>'content'</tt> object otherwise
Q_INVOKABLE QJsonObject contentJson(const QString& evtType,
const QString& stateKey = {}) const;
//! \brief Get all state events in the room of a certain type.
//!
//! This method returns all known state events that have occured in
//! the room of the given type.
const QVector<const StateEvent*> eventsOfType(const QString& evtType) const;
//! \brief Run a function on a state event with the given type and key
//!
//! Use this overload when there's no predefined event type or the event
//! type is unknown at compile time.
//! \return an Omittable with either the result of the function call, or
//! with `none` if the event is not found or the function fails
template <typename FnT>
auto query(const QString& evtType, const QString& stateKey, FnT&& fn) const
{
return lift(std::forward<FnT>(fn), get(evtType, stateKey));
}
//! \brief Run a function on a state event with the given type and key
//!
//! This is an overload for keyed state events (those that have
//! `needsStateKey == true`) with type defined at compile time.
//! \return an Omittable with either the result of the function call, or
//! with `none` if the event is not found or the function fails
template <Keyed_State_Fn FnT>
auto query(const QString& stateKey, FnT&& fn) const
{
using EventT = std::decay_t<fn_arg_t<FnT>>;
return lift(std::forward<FnT>(fn), get<EventT>(stateKey));
}
//! \brief Run a function on a keyless state event with the given type
//!
//! This is an overload for keyless state events (those having
//! `needsStateKey == false`) with type defined at compile time.
//! \return an Omittable with either the result of the function call, or
//! with `none` if the event is not found or the function fails
template <Keyless_State_Fn FnT>
auto query(FnT&& fn) const
{
using EventT = std::decay_t<fn_arg_t<FnT>>;
return lift(std::forward<FnT>(fn), get<EventT>());
}
//! \brief Same as query() but with a fallback value
//!
//! This is a shortcut for `query().value_or()`, passing respective
//! arguments to the respective functions. This is an overload for the case
//! when the event type cannot be fixed at compile time.
//! \return the result of \p fn execution, or \p fallback if the requested
//! event doesn't exist or the function fails
template <typename FnT, typename FallbackT>
auto queryOr(const QString& evtType, const QString& stateKey, FnT&& fn,
FallbackT&& fallback) const
{
return query(evtType, stateKey, std::forward<FnT>(fn))
.value_or(std::forward<FallbackT>(fallback));
}
//! \brief Same as query() but with a fallback value
//!
//! This is a shortcut for `query().value_or()`, passing respective
//! arguments to the respective functions. This is an overload for the case
//! when the event type cannot be fixed at compile time.
//! \return the result of \p fn execution, or \p fallback if the requested
//! event doesn't exist or the function fails
template <typename FnT, typename FallbackT>
auto queryOr(const QString& stateKey, FnT&& fn, FallbackT&& fallback) const
{
return query(stateKey, std::forward<FnT>(fn))
.value_or(std::forward<FallbackT>(fallback));
}
//! \brief Same as query() but with a fallback value
//!
//! This is a shortcut for `query().value_or()`, passing respective
//! arguments to the respective functions. This is an overload for the case
//! when the event type cannot be fixed at compile time.
//! \return the result of \p fn execution, or \p fallback if the requested
//! event doesn't exist or the function fails
template <typename FnT, typename FallbackT>
auto queryOr(FnT&& fn, FallbackT&& fallback) const
{
return query(std::forward<FnT>(fn))
.value_or(std::forward<FallbackT>(fallback));
}
private:
friend class Room;
};
} // namespace Quotient
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