#ifndef _CHUNK_H
#define _CHUNK_H

#include "common.h"
#include "value.h"

// max 256 opcodes
typedef enum {
	OP_CONSTANT, OP_CONSTANT_LONG,
	OP_ADD, OP_SUBTRACT,
	OP_MULTIPLY, OP_DIVIDE,
	OP_NEGATE,
	OP_RETURN,

	NUM_OP, // total number of valid opcodes
} OpCode;

typedef struct {
	int count;
	int capacity;
	bool bDebug; // if line numbers are kept or not
	uint8_t* code;
	uint16_t* lines; // 16bit line numbers
	ValueArray constants;
} Chunk;

void initChunk( Chunk* chunk );
void freeChunk( Chunk* chunk );

// write single byte to code memory
void writeChunk( Chunk* chunk, uint8_t byte, uint16_t line );
// u16 write / read
void writeChunk16( Chunk* chunk, uint16_t word, uint16_t line );
uint16_t readChunk16( Chunk* chunk, int offset );

// add constant val to chunk's array. return index where it was added
uint16_t addConstant( Chunk* chunk, Value val );

// high level for adding and writing chunk constants
void writeConstant( Chunk* chunk, Value val, uint16_t line );

#endif