/**************************************************************************/
/*  animation_blend_tree.h                                                */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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/**************************************************************************/

#ifndef ANIMATION_BLEND_TREE_H
#define ANIMATION_BLEND_TREE_H

#include "scene/animation/animation_tree.h"

class AnimationNodeAnimation : public AnimationRootNode {
	GDCLASS(AnimationNodeAnimation, AnimationRootNode);

	StringName animation;
	StringName time = "time";

	uint64_t last_version = 0;
	bool skip = false;

public:
	enum PlayMode {
		PLAY_MODE_FORWARD,
		PLAY_MODE_BACKWARD
	};

	void get_parameter_list(List<PropertyInfo> *r_list) const override;

	static Vector<String> (*get_editable_animation_list)();

	virtual String get_caption() const override;
	virtual double _process(double p_time, bool p_seek, bool p_is_external_seeking, bool p_test_only = false) override;

	void set_animation(const StringName &p_name);
	StringName get_animation() const;

	void set_play_mode(PlayMode p_play_mode);
	PlayMode get_play_mode() const;

	void set_backward(bool p_backward);
	bool is_backward() const;

	AnimationNodeAnimation();

protected:
	void _validate_property(PropertyInfo &p_property) const;
	static void _bind_methods();

private:
	PlayMode play_mode = PLAY_MODE_FORWARD;
	bool backward = false; // Only used by pingpong animation.
};

VARIANT_ENUM_CAST(AnimationNodeAnimation::PlayMode)

class AnimationNodeSync : public AnimationNode {
	GDCLASS(AnimationNodeSync, AnimationNode);

protected:
	bool sync = false;

	static void _bind_methods();

public:
	void set_use_sync(bool p_sync);
	bool is_using_sync() const;

	AnimationNodeSync();
};

class AnimationNodeOneShot : public AnimationNodeSync {
	GDCLASS(AnimationNodeOneShot, AnimationNodeSync);

public:
	enum OneShotRequest {
		ONE_SHOT_REQUEST_NONE,
		ONE_SHOT_REQUEST_FIRE,
		ONE_SHOT_REQUEST_ABORT,
	};

	enum MixMode {
		MIX_MODE_BLEND,
		MIX_MODE_ADD
	};

private:
	double fade_in = 0.0;
	double fade_out = 0.0;

	bool autorestart = false;
	double autorestart_delay = 1.0;
	double autorestart_random_delay = 0.0;
	MixMode mix = MIX_MODE_BLEND;

	StringName request = PNAME("request");
	StringName active = PNAME("active");
	StringName time = "time";
	StringName remaining = "remaining";
	StringName time_to_restart = "time_to_restart";

protected:
	static void _bind_methods();

public:
	virtual void get_parameter_list(List<PropertyInfo> *r_list) const override;
	virtual Variant get_parameter_default_value(const StringName &p_parameter) const override;
	virtual bool is_parameter_read_only(const StringName &p_parameter) const override;

	virtual String get_caption() const override;

	void set_fadein_time(double p_time);
	void set_fadeout_time(double p_time);

	double get_fadein_time() const;
	double get_fadeout_time() const;

	void set_autorestart(bool p_active);
	void set_autorestart_delay(double p_time);
	void set_autorestart_random_delay(double p_time);

	bool has_autorestart() const;
	double get_autorestart_delay() const;
	double get_autorestart_random_delay() const;

	void set_mix_mode(MixMode p_mix);
	MixMode get_mix_mode() const;

	virtual bool has_filter() const override;
	virtual double _process(double p_time, bool p_seek, bool p_is_external_seeking, bool p_test_only = false) override;

	AnimationNodeOneShot();
};

VARIANT_ENUM_CAST(AnimationNodeOneShot::OneShotRequest)
VARIANT_ENUM_CAST(AnimationNodeOneShot::MixMode)

class AnimationNodeAdd2 : public AnimationNodeSync {
	GDCLASS(AnimationNodeAdd2, AnimationNodeSync);

	StringName add_amount = PNAME("add_amount");

protected:
	static void _bind_methods();

public:
	void get_parameter_list(List<PropertyInfo> *r_list) const override;
	virtual Variant get_parameter_default_value(const StringName &p_parameter) const override;

	virtual String get_caption() const override;

	virtual bool has_filter() const override;
	virtual double _process(double p_time, bool p_seek, bool p_is_external_seeking, bool p_test_only = false) override;

	AnimationNodeAdd2();
};

class AnimationNodeAdd3 : public AnimationNodeSync {
	GDCLASS(AnimationNodeAdd3, AnimationNodeSync);

	StringName add_amount = PNAME("add_amount");

protected:
	static void _bind_methods();

public:
	void get_parameter_list(List<PropertyInfo> *r_list) const override;
	virtual Variant get_parameter_default_value(const StringName &p_parameter) const override;

	virtual String get_caption() const override;

	virtual bool has_filter() const override;
	virtual double _process(double p_time, bool p_seek, bool p_is_external_seeking, bool p_test_only = false) override;

	AnimationNodeAdd3();
};

class AnimationNodeBlend2 : public AnimationNodeSync {
	GDCLASS(AnimationNodeBlend2, AnimationNodeSync);

	StringName blend_amount = PNAME("blend_amount");

protected:
	static void _bind_methods();

public:
	virtual void get_parameter_list(List<PropertyInfo> *r_list) const override;
	virtual Variant get_parameter_default_value(const StringName &p_parameter) const override;

	virtual String get_caption() const override;
	virtual double _process(double p_time, bool p_seek, bool p_is_external_seeking, bool p_test_only = false) override;

	virtual bool has_filter() const override;
	AnimationNodeBlend2();
};

class AnimationNodeBlend3 : public AnimationNodeSync {
	GDCLASS(AnimationNodeBlend3, AnimationNodeSync);

	StringName blend_amount = PNAME("blend_amount");

protected:
	static void _bind_methods();

public:
	virtual void get_parameter_list(List<PropertyInfo> *r_list) const override;
	virtual Variant get_parameter_default_value(const StringName &p_parameter) const override;

	virtual String get_caption() const override;

	virtual double _process(double p_time, bool p_seek, bool p_is_external_seeking, bool p_test_only = false) override;
	AnimationNodeBlend3();
};

class AnimationNodeTimeScale : public AnimationNode {
	GDCLASS(AnimationNodeTimeScale, AnimationNode);

	StringName scale = PNAME("scale");

protected:
	static void _bind_methods();

public:
	virtual void get_parameter_list(List<PropertyInfo> *r_list) const override;
	virtual Variant get_parameter_default_value(const StringName &p_parameter) const override;

	virtual String get_caption() const override;

	virtual double _process(double p_time, bool p_seek, bool p_is_external_seeking, bool p_test_only = false) override;

	AnimationNodeTimeScale();
};

class AnimationNodeTimeSeek : public AnimationNode {
	GDCLASS(AnimationNodeTimeSeek, AnimationNode);

	StringName seek_pos_request = PNAME("seek_request");

protected:
	static void _bind_methods();

public:
	virtual void get_parameter_list(List<PropertyInfo> *r_list) const override;
	virtual Variant get_parameter_default_value(const StringName &p_parameter) const override;

	virtual String get_caption() const override;

	virtual double _process(double p_time, bool p_seek, bool p_is_external_seeking, bool p_test_only = false) override;

	AnimationNodeTimeSeek();
};

class AnimationNodeTransition : public AnimationNodeSync {
	GDCLASS(AnimationNodeTransition, AnimationNodeSync);

	struct InputData {
		bool auto_advance = false;
		bool reset = true;
	};
	Vector<InputData> input_data;

	StringName time = "time";
	StringName prev_xfading = "prev_xfading";
	StringName prev_index = "prev_index";
	StringName current_index = PNAME("current_index");
	StringName current_state = PNAME("current_state");
	StringName transition_request = PNAME("transition_request");

	StringName prev_frame_current = "pf_current";
	StringName prev_frame_current_idx = "pf_current_idx";

	double xfade_time = 0.0;
	Ref<Curve> xfade_curve;
	bool allow_transition_to_self = false;

	bool pending_update = false;

protected:
	bool _get(const StringName &p_path, Variant &r_ret) const;
	bool _set(const StringName &p_path, const Variant &p_value);
	static void _bind_methods();
	void _get_property_list(List<PropertyInfo> *p_list) const;

public:
	virtual void get_parameter_list(List<PropertyInfo> *r_list) const override;
	virtual Variant get_parameter_default_value(const StringName &p_parameter) const override;
	virtual bool is_parameter_read_only(const StringName &p_parameter) const override;

	virtual String get_caption() const override;

	void set_input_count(int p_inputs);

	virtual bool add_input(const String &p_name) override;
	virtual void remove_input(int p_index) override;
	virtual bool set_input_name(int p_input, const String &p_name) override;

	void set_input_as_auto_advance(int p_input, bool p_enable);
	bool is_input_set_as_auto_advance(int p_input) const;

	void set_input_reset(int p_input, bool p_enable);
	bool is_input_reset(int p_input) const;

	void set_xfade_time(double p_fade);
	double get_xfade_time() const;

	void set_xfade_curve(const Ref<Curve> &p_curve);
	Ref<Curve> get_xfade_curve() const;

	void set_allow_transition_to_self(bool p_enable);
	bool is_allow_transition_to_self() const;

	virtual double _process(double p_time, bool p_seek, bool p_is_external_seeking, bool p_test_only = false) override;

	AnimationNodeTransition();
};

class AnimationNodeOutput : public AnimationNode {
	GDCLASS(AnimationNodeOutput, AnimationNode);

public:
	virtual String get_caption() const override;
	virtual double _process(double p_time, bool p_seek, bool p_is_external_seeking, bool p_test_only = false) override;
	AnimationNodeOutput();
};

/////

class AnimationNodeBlendTree : public AnimationRootNode {
	GDCLASS(AnimationNodeBlendTree, AnimationRootNode);

	struct Node {
		Ref<AnimationNode> node;
		Vector2 position;
		Vector<StringName> connections;
	};

	HashMap<StringName, Node> nodes;

	Vector2 graph_offset;

	void _node_changed(const StringName &p_node);

	void _initialize_node_tree();

protected:
	static void _bind_methods();
	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;

	virtual void _tree_changed() override;
	virtual void _animation_node_renamed(const ObjectID &p_oid, const String &p_old_name, const String &p_new_name) override;
	virtual void _animation_node_removed(const ObjectID &p_oid, const StringName &p_node) override;

	virtual void reset_state() override;

public:
	enum ConnectionError {
		CONNECTION_OK,
		CONNECTION_ERROR_NO_INPUT,
		CONNECTION_ERROR_NO_INPUT_INDEX,
		CONNECTION_ERROR_NO_OUTPUT,
		CONNECTION_ERROR_SAME_NODE,
		CONNECTION_ERROR_CONNECTION_EXISTS,
		//no need to check for cycles due to tree topology
	};

	void add_node(const StringName &p_name, Ref<AnimationNode> p_node, const Vector2 &p_position = Vector2());
	Ref<AnimationNode> get_node(const StringName &p_name) const;
	void remove_node(const StringName &p_name);
	void rename_node(const StringName &p_name, const StringName &p_new_name);
	bool has_node(const StringName &p_name) const;
	StringName get_node_name(const Ref<AnimationNode> &p_node) const;
	Vector<StringName> get_node_connection_array(const StringName &p_name) const;

	void set_node_position(const StringName &p_node, const Vector2 &p_position);
	Vector2 get_node_position(const StringName &p_node) const;

	virtual void get_child_nodes(List<ChildNode> *r_child_nodes) override;

	void connect_node(const StringName &p_input_node, int p_input_index, const StringName &p_output_node);
	void disconnect_node(const StringName &p_node, int p_input_index);

	struct NodeConnection {
		StringName input_node;
		int input_index = 0;
		StringName output_node;
	};

	ConnectionError can_connect_node(const StringName &p_input_node, int p_input_index, const StringName &p_output_node) const;
	void get_node_connections(List<NodeConnection> *r_connections) const;

	virtual String get_caption() const override;
	virtual double _process(double p_time, bool p_seek, bool p_is_external_seeking, bool p_test_only = false) override;

	void get_node_list(List<StringName> *r_list);

	void set_graph_offset(const Vector2 &p_graph_offset);
	Vector2 get_graph_offset() const;

	virtual Ref<AnimationNode> get_child_by_name(const StringName &p_name) const override;

	AnimationNodeBlendTree();
	~AnimationNodeBlendTree();
};

VARIANT_ENUM_CAST(AnimationNodeBlendTree::ConnectionError)

#endif // ANIMATION_BLEND_TREE_H