#pragma once

#include "toy_common.h"
#include "toy_literal.h"
#include "toy_literal_array.h"
#include "toy_literal_dictionary.h"
#include "toy_scope.h"

typedef void (*Toy_PrintFn)(const char*);

//the interpreter acts depending on the bytecode instructions
typedef struct Toy_Interpreter {
	//input
	unsigned char* bytecode;
	int length;
	int count;
	int codeStart; //BUGFIX: for jumps, must be initialized to -1
	Toy_LiteralArray literalCache; //read-only - built from the bytecode, refreshed each time new bytecode is provided

	//operation
	Toy_Scope* scope;
	Toy_LiteralArray stack;

	//Library APIs
	Toy_LiteralDictionary* hooks;

	//debug outputs
	Toy_PrintFn printOutput;
	Toy_PrintFn assertOutput;
	Toy_PrintFn errorOutput;

	int depth; //don't overflow
	bool panic;
} Toy_Interpreter;

//native API
TOY_API bool Toy_injectNativeFn(Toy_Interpreter* interpreter, char* name, Toy_NativeFn func);
TOY_API bool Toy_injectNativeHook(Toy_Interpreter* interpreter, char* name, Toy_HookFn hook);

TOY_API bool Toy_callLiteralFn(Toy_Interpreter* interpreter, Toy_Literal func, Toy_LiteralArray* arguments, Toy_LiteralArray* returns);
TOY_API bool Toy_callFn(Toy_Interpreter* interpreter, char* name, Toy_LiteralArray* arguments, Toy_LiteralArray* returns);

//utilities for the host program
TOY_API bool Toy_parseIdentifierToValue(Toy_Interpreter* interpreter, Toy_Literal* literalPtr);
TOY_API void Toy_setInterpreterPrint(Toy_Interpreter* interpreter, Toy_PrintFn printOutput);
TOY_API void Toy_setInterpreterAssert(Toy_Interpreter* interpreter, Toy_PrintFn assertOutput);
TOY_API void Toy_setInterpreterError(Toy_Interpreter* interpreter, Toy_PrintFn errorOutput);

//main access
TOY_API void Toy_initInterpreter(Toy_Interpreter* interpreter); //start of program
TOY_API void Toy_runInterpreter(Toy_Interpreter* interpreter, unsigned char* bytecode, int length); //run the code
TOY_API void Toy_resetInterpreter(Toy_Interpreter* interpreter); //use this to reset the interpreter's environment between runs
TOY_API void Toy_freeInterpreter(Toy_Interpreter* interpreter); //end of program