/*************************************************************************/
/*  animation_player.h                                                   */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
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/* "Software"), to deal in the Software without restriction, including   */
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/* distribute, sublicense, and/or sell copies of the Software, and to    */
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/* The above copyright notice and this permission notice shall be        */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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/*************************************************************************/
#ifndef ANIMATION_PLAYER_H
#define ANIMATION_PLAYER_H

#include "scene/2d/node_2d.h"
#include "scene/3d/skeleton.h"
#include "scene/3d/spatial.h"
#include "scene/resources/animation.h"
/**
	@author Juan Linietsky <reduzio@gmail.com>
*/

#ifdef TOOLS_ENABLED
// To save/restore animated values
class AnimatedValuesBackup {
	struct Entry {
		Object *object;
		Vector<StringName> subpath; // Unused if bone
		int bone_idx; // -1 if not a bone
		Variant value;
	};
	Vector<Entry> entries;

	friend class AnimationPlayer;

public:
	void update_skeletons();
};
#endif

class AnimationPlayer : public Node {
	GDCLASS(AnimationPlayer, Node);
	OBJ_CATEGORY("Animation Nodes");

public:
	enum AnimationProcessMode {
		ANIMATION_PROCESS_PHYSICS,
		ANIMATION_PROCESS_IDLE,
	};

private:
	enum {

		NODE_CACHE_UPDATE_MAX = 1024,
		BLEND_FROM_MAX = 3
	};

	enum SpecialProperty {
		SP_NONE,
		SP_NODE2D_POS,
		SP_NODE2D_ROT,
		SP_NODE2D_SCALE,
	};

	struct TrackNodeCache {

		NodePath path;
		uint32_t id;
		RES resource;
		Node *node;
		Spatial *spatial;
		Node2D *node_2d;
		Skeleton *skeleton;
		int bone_idx;
		// accumulated transforms

		Vector3 loc_accum;
		Quat rot_accum;
		Vector3 scale_accum;
		uint64_t accum_pass;

		struct PropertyAnim {

			TrackNodeCache *owner;
			SpecialProperty special; //small optimization
			Vector<StringName> subpath;
			Object *object;
			Variant value_accum;
			uint64_t accum_pass;
			PropertyAnim() {
				accum_pass = 0;
				object = NULL;
			}
		};

		Map<StringName, PropertyAnim> property_anim;

		TrackNodeCache() {
			skeleton = NULL;
			spatial = NULL;
			node = NULL;
			accum_pass = 0;
			bone_idx = -1;
			node_2d = NULL;
		}
	};

	struct TrackNodeCacheKey {

		uint32_t id;
		int bone_idx;

		inline bool operator<(const TrackNodeCacheKey &p_right) const {

			if (id < p_right.id)
				return true;
			else if (id > p_right.id)
				return false;
			else
				return bone_idx < p_right.bone_idx;
		}
	};

	Map<TrackNodeCacheKey, TrackNodeCache> node_cache_map;

	TrackNodeCache *cache_update[NODE_CACHE_UPDATE_MAX];
	int cache_update_size;
	TrackNodeCache::PropertyAnim *cache_update_prop[NODE_CACHE_UPDATE_MAX];
	int cache_update_prop_size;
	Map<Ref<Animation>, int> used_anims;

	uint64_t accum_pass;
	float speed_scale;
	float default_blend_time;

	struct AnimationData {
		String name;
		StringName next;
		Vector<TrackNodeCache *> node_cache;
		Ref<Animation> animation;
	};

	Map<StringName, AnimationData> animation_set;
	struct BlendKey {

		StringName from;
		StringName to;
		bool operator<(const BlendKey &bk) const { return from == bk.from ? String(to) < String(bk.to) : String(from) < String(bk.from); }
	};

	Map<BlendKey, float> blend_times;

	struct PlaybackData {

		AnimationData *from;
		float pos;
		float speed_scale;

		PlaybackData() {

			pos = 0;
			speed_scale = 1.0;
			from = NULL;
		}
	};

	struct Blend {

		PlaybackData data;

		float blend_time;
		float blend_left;

		Blend() {

			blend_left = 0;
			blend_time = 0;
		}
	};

	struct Playback {

		List<Blend> blend;
		PlaybackData current;
		StringName assigned;
	} playback;

	List<StringName> queued;

	bool end_notify;

	String autoplay;
	AnimationProcessMode animation_process_mode;
	bool processing;
	bool active;

	NodePath root;

	void _animation_process_animation(AnimationData *p_anim, float p_time, float p_delta, float p_interp, bool p_allow_discrete = true);

	void _ensure_node_caches(AnimationData *p_anim);
	void _animation_process_data(PlaybackData &cd, float p_delta, float p_blend);
	void _animation_process2(float p_delta);
	void _animation_update_transforms();
	void _animation_process(float p_delta);

	void _node_removed(Node *p_node);

	// bind helpers
	PoolVector<String> _get_animation_list() const {

		List<StringName> animations;
		get_animation_list(&animations);
		PoolVector<String> ret;
		while (animations.size()) {

			ret.push_back(animations.front()->get());
			animations.pop_front();
		}
		return ret;
	}

	void _animation_changed();
	void _ref_anim(const Ref<Animation> &p_anim);
	void _unref_anim(const Ref<Animation> &p_anim);

	void _set_process(bool p_process, bool p_force = false);

	bool playing;

protected:
	bool _set(const StringName &p_name, const Variant &p_value);
	bool _get(const StringName &p_name, Variant &r_ret) const;
	void _get_property_list(List<PropertyInfo> *p_list) const;
	void _notification(int p_what);

	static void _bind_methods();

public:
	StringName find_animation(const Ref<Animation> &p_animation) const;

	Error add_animation(const StringName &p_name, const Ref<Animation> &p_animation);
	void remove_animation(const StringName &p_name);
	void rename_animation(const StringName &p_name, const StringName &p_new_name);
	bool has_animation(const StringName &p_name) const;
	Ref<Animation> get_animation(const StringName &p_name) const;
	void get_animation_list(List<StringName> *p_animations) const;

	void set_blend_time(const StringName &p_animation1, const StringName &p_animation2, float p_time);
	float get_blend_time(const StringName &p_animation1, const StringName &p_animation2) const;

	void animation_set_next(const StringName &p_animation, const StringName &p_next);
	StringName animation_get_next(const StringName &p_animation) const;

	void set_default_blend_time(float p_default);
	float get_default_blend_time() const;

	void play(const StringName &p_name = StringName(), float p_custom_blend = -1, float p_custom_scale = 1.0, bool p_from_end = false);
	void play_backwards(const StringName &p_name = StringName(), float p_custom_blend = -1);
	void queue(const StringName &p_name);
	void clear_queue();
	void stop(bool p_reset = true);
	bool is_playing() const;
	String get_current_animation() const;
	void set_current_animation(const String &p_anim);
	void stop_all();
	void set_active(bool p_active);
	bool is_active() const;
	bool is_valid() const;

	void set_speed_scale(float p_speed);
	float get_speed_scale() const;

	void set_autoplay(const String &p_name);
	String get_autoplay() const;

	void set_animation_process_mode(AnimationProcessMode p_mode);
	AnimationProcessMode get_animation_process_mode() const;

	void seek(float p_time, bool p_update = false);
	void seek_delta(float p_time, float p_delta);
	float get_current_animation_position() const;
	float get_current_animation_length() const;

	void advance(float p_time);

	void set_root(const NodePath &p_root);
	NodePath get_root() const;

	void clear_caches(); ///< must be called by hand if an animation was modified after added

	void get_argument_options(const StringName &p_function, int p_idx, List<String> *r_options) const;

#ifdef TOOLS_ENABLED
	// These may be interesting for games, but are too dangerous for general use
	AnimatedValuesBackup backup_animated_values();
	void restore_animated_values(const AnimatedValuesBackup &p_backup);
#endif

	AnimationPlayer();
	~AnimationPlayer();
};

VARIANT_ENUM_CAST(AnimationPlayer::AnimationProcessMode);

#endif