#ifndef GD_FUNCTION_H
#define GD_FUNCTION_H

#include "self_list.h"
#include "os/thread.h"
#include "pair.h"
#include "variant.h"
#include "string_db.h"
#include "reference.h"

class GDInstance;
class GDScript;


class GDFunction {
public:

	enum Opcode {
		OPCODE_OPERATOR,
		OPCODE_EXTENDS_TEST,
		OPCODE_SET,
		OPCODE_GET,
		OPCODE_SET_NAMED,
		OPCODE_GET_NAMED,
		OPCODE_ASSIGN,
		OPCODE_ASSIGN_TRUE,
		OPCODE_ASSIGN_FALSE,
		OPCODE_CONSTRUCT, //only for basic types!!
		OPCODE_CONSTRUCT_ARRAY,
		OPCODE_CONSTRUCT_DICTIONARY,
		OPCODE_CALL,
		OPCODE_CALL_RETURN,
		OPCODE_CALL_BUILT_IN,
		OPCODE_CALL_SELF,
		OPCODE_CALL_SELF_BASE,
		OPCODE_YIELD,
		OPCODE_YIELD_SIGNAL,
		OPCODE_YIELD_RESUME,
		OPCODE_JUMP,
		OPCODE_JUMP_IF,
		OPCODE_JUMP_IF_NOT,
		OPCODE_JUMP_TO_DEF_ARGUMENT,
		OPCODE_RETURN,
		OPCODE_ITERATE_BEGIN,
		OPCODE_ITERATE,
		OPCODE_ASSERT,
		OPCODE_BREAKPOINT,
		OPCODE_LINE,
		OPCODE_END
	};

	enum Address {
		ADDR_BITS=24,
		ADDR_MASK=((1<<ADDR_BITS)-1),
		ADDR_TYPE_MASK=~ADDR_MASK,
		ADDR_TYPE_SELF=0,
		ADDR_TYPE_CLASS=1,
		ADDR_TYPE_MEMBER=2,
		ADDR_TYPE_CLASS_CONSTANT=3,
		ADDR_TYPE_LOCAL_CONSTANT=4,
		ADDR_TYPE_STACK=5,
		ADDR_TYPE_STACK_VARIABLE=6,
		ADDR_TYPE_GLOBAL=7,
		ADDR_TYPE_NIL=8
	};

    struct StackDebug {

	int line;
	int pos;
	bool added;
	StringName identifier;
    };

private:
friend class GDCompiler;

	StringName source;

	mutable Variant nil;
	mutable Variant *_constants_ptr;
	int _constant_count;
	const StringName *_global_names_ptr;
	int _global_names_count;
	const int *_default_arg_ptr;
	int _default_arg_count;
	const int *_code_ptr;
	int _code_size;
	int _argument_count;
	int _stack_size;
	int _call_size;
	int _initial_line;
	bool _static;
	GDScript *_script;

	StringName name;
	Vector<Variant> constants;
	Vector<StringName> global_names;
	Vector<int> default_arguments;
	Vector<int> code;

#ifdef TOOLS_ENABLED
	Vector<StringName> arg_names;
#endif

	List<StackDebug> stack_debug;

	_FORCE_INLINE_ Variant *_get_variant(int p_address,GDInstance *p_instance,GDScript *p_script,Variant &self,Variant *p_stack,String& r_error) const;
	_FORCE_INLINE_ String _get_call_error(const Variant::CallError& p_err, const String& p_where,const Variant**argptrs) const;

friend class GDScriptLanguage;

	SelfList<GDFunction> function_list;
#ifdef DEBUG_ENABLED
	CharString func_cname;
	const char*_func_cname;

	struct Profile {
		StringName signature;
		uint64_t call_count;
		uint64_t self_time;
		uint64_t total_time;
		uint64_t frame_call_count;
		uint64_t frame_self_time;
		uint64_t frame_total_time;
		uint64_t last_frame_call_count;
		uint64_t last_frame_self_time;
		uint64_t last_frame_total_time;
	} profile;

#endif

public:



	struct CallState {

		GDInstance *instance;
		Vector<uint8_t> stack;
		int stack_size;
		Variant self;
		uint32_t alloca_size;
		GDScript *_class;
		int ip;
		int line;
		int defarg;
		Variant result;

	};

	_FORCE_INLINE_ bool is_static() const { return _static; }

	const int* get_code() const; //used for debug
	int get_code_size() const;
	Variant get_constant(int p_idx) const;
	StringName get_global_name(int p_idx) const;
	StringName get_name() const;
	int get_max_stack_size() const;
	int get_default_argument_count() const;
	int get_default_argument_addr(int p_idx) const;
	GDScript *get_script() const { return _script; }
	StringName get_source() const { return source; }

	void debug_get_stack_member_state(int p_line,List<Pair<StringName,int> > *r_stackvars) const;

	_FORCE_INLINE_ bool is_empty() const { return _code_size==0; }

	int get_argument_count() const { return _argument_count; }
	StringName get_argument_name(int p_idx) const {
#ifdef TOOLS_ENABLED
		ERR_FAIL_INDEX_V(p_idx,arg_names.size(),StringName());
		return arg_names[p_idx];
#endif
		return StringName();

	}
	Variant get_default_argument(int p_idx) const {
		ERR_FAIL_INDEX_V(p_idx,default_arguments.size(),Variant());
		return default_arguments[p_idx];
	}

	Variant call(GDInstance *p_instance,const Variant **p_args, int p_argcount,Variant::CallError& r_err,CallState *p_state=NULL);

	GDFunction();
	~GDFunction();
};


class GDFunctionState : public Reference {

	OBJ_TYPE(GDFunctionState,Reference);
friend class GDFunction;
	GDFunction *function;
	GDFunction::CallState state;
	Variant _signal_callback(const Variant** p_args, int p_argcount, Variant::CallError& r_error);
protected:
	static void _bind_methods();
public:

	bool is_valid() const;
	Variant resume(const Variant& p_arg=Variant());
	GDFunctionState();
	~GDFunctionState();
};


#endif // GD_FUNCTION_H