1 files changed, 96 insertions, 0 deletions
diff --git a/src/crepe/manager/ReplayManager.h b/src/crepe/manager/ReplayManager.h
new file mode 100644
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+++ b/src/crepe/manager/ReplayManager.h
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+#pragma once
+
+#include <unordered_map>
+
+#include "../util/OptionalRef.h"
+
+#include "ComponentManager.h"
+#include "Manager.h"
+
+namespace crepe {
+
+//! Handle to recording held by ReplayManager
+typedef size_t recording_t;
+
+/**
+ * \brief Replay manager
+ *
+ * The replay manager is responsible for creating, storing and restoring ComponentManager
+ * snapshots. Sequential snapshots can be recorded and replayed in combination with
+ * ReplaySystem.
+ */
+class ReplayManager : public Manager {
+	// TODO: Delete recordings at end of scene
+
+public:
+	ReplayManager(Mediator & mediator);
+
+public:
+	//! Start a new recording
+	void record_start();
+	/**
+	 * \brief End the latest recording started by \c record_start()
+	 * \returns Handle to recording
+	 */
+	recording_t record_end();
+	/**
+	 * \brief Play a recording
+	 * \param handle Handle to recording (as returned by \c record_end())
+	 */
+	void play(recording_t handle);
+	/**
+	 * \brief Delete a recording from memory
+	 * \param handle Handle to recording (as returned by \c record_end())
+	 */
+	void release(recording_t handle);
+
+public:
+	//! Internal state
+	enum State {
+		IDLE, //!< Not doing anything
+		RECORDING, //!< Currently recording
+		PLAYING, //!< Currently playing back a recording
+	};
+	//! Get current internal state
+	State get_state() const;
+
+public:
+	/**
+	 * \brief Record a single frame to the current recording
+	 *
+	 * This function is called by ReplaySystem after the game programmer has called \c
+	 * record_start()
+	 */
+	void frame_record();
+	/**
+	 * \brief Play the next frame of the current recording
+	 *
+	 * \returns `true` if the recording is finished playing
+	 * \returns `false` if there are more frames
+	 *
+	 * This function also automatically resets the internal state from PLAYING to IDLE at the end
+	 * of a recording.
+	 */
+	bool frame_step();
+
+private:
+	/**
+	 * \brief Recording data
+	 */
+	struct Recording {
+		//! Current frame being shown
+		size_t frame = 0;
+		//! All frames in recording
+		std::vector<ComponentManager::Snapshot> frames;
+	};
+	//! Internal state
+	State state = IDLE;
+	//! Current recording handle
+	recording_t id = -1;
+	//! Current recording data
+	OptionalRef<Recording> recording;
+	//! Recording storage
+	std::unordered_map<recording_t, std::unique_ptr<Recording>> memory;
+};
+
+} // namespace crepe