program

type CHR []byte

type Checksums struct {
	PRG     uint32
	CHR     uint32
	Overall uint32
}

type Handlers struct {
	NMI   string
	Reset string
	IRQ   string
}

type Offset struct {
	// data byte or all opcode bytes that are part of the instruction
	OpcodeBytes []byte
	// WriteCallback is a custom callback function that gets called before the offset is
	// written, this allows custom bank switch code to be written at specific offsets.
	// The output of bundled data bytes will be interrupted.
	WriteCallback WriteCallbackFunc

	Type OffsetType

	Address           uint16
	HasAddressComment bool

	Label        string // name of label or subroutine if identified as a jump destination
	Code         string // asm output of this instruction
	Comment      string
	LabelComment string
}

type OffsetType uint8

type PRGBank struct {
	PRG       []Offset // PRG-ROM banks
	Constants map[string]uint16
	Variables map[string]uint16
}

type Program struct {
	PRG     []*PRGBank // PRG-ROM banks
	CHR     CHR        // CHR-ROM data
	RAM     byte       // PRG-RAM offsets
	Trainer []byte

	CodeBaseAddress uint16
	Checksums       Checksums
	Handlers        Handlers
	Battery         byte
	Mirror          cartridge.MirrorMode
	Mapper          byte
	VideoFormat     byte

	// keep constants and variables in the banks and global in the app to let the chosen assembler decide
	// how to output them
	Constants map[string]uint16
	Variables map[string]uint16
}

type WriteCallbackFunc func(writer io.Writer) error