dicom

type DataSet struct {
	// Elements in the file, in order of appearance.
	//
	// Note: unlike pydicom, Elements also contains meta elements (those
	// with Tag.Group==2).
	Elements []*Element
}

type DateInfo struct {
	// Input string.
	Str string
	// Results of parsing Str
	Year  int // Year (CE), in range [0,9999]. E.g., 2015
	Month int // Month of year, in range [1,12].
	Day   int // Day of month, in range [1,31].
}

type DirectoryRecord struct {
	Path string
}

type Element struct {
	// Tag is a pair of <group, element>. See tags.go for possible values.
	Tag dicomtag.Tag

	// List of values in the element. Their types depends on value
	// representation (VR) of the Tag; Cf. tag.go.
	//
	// If Tag==TagPixelData, len(Value)==1, and Value[0] is PixelDataInfo.
	// Else if Tag==TagItem, each Value[i] is a *Element.
	//    a value's Tag can be any (including TagItem, which represents a nested Item)
	// Else if VR=="SQ", Value[i] is a *Element, with Tag=TagItem.
	// Else if VR=="OW", "OB", then len(Value)==1, and Value[0] is []byte.
	// Else if VR=="LT", or "UT", then len(Value)==1, and Value[0] is string
	// Else if VR=="DA", then len(Value)==1, and Value[0] is string. Use ParseDate() to parse the date string.
	// Else if VR=="US", Value[] is a list of uint16s
	// Else if VR=="UL", Value[] is a list of uint32s
	// Else if VR=="SS", Value[] is a list of int16s
	// Else if VR=="SL", Value[] is a list of int32s
	// Else if VR=="FL", Value[] is a list of float32s
	// Else if VR=="FD", Value[] is a list of float64s
	// Else if VR=="AT", Value[] is a list of Tag's.
	// Else, Value[] is a list of strings.
	//
	// Note: Use GetVRKind() to map VR string to the go representation of
	// VR.
	Value []interface{} // Value Multiplicity PS 3.5 6.4

	// VR defines the encoding of Value[] in two-letter alphabets, e.g.,
	// "AE", "UL". See P3.5 6.2. This field MUST be set.
	//
	// dicom.ReadElement() will fill this field with the VR of the tag,
	// either read from input stream (for explicit repl), or from the dicom
	// tag table (for implicit decl). This field need not be set in
	// WriteElement().
	//
	// Note: In a conformant DICOM file, the VR value of an element is
	// determined by its Tag, so this field is redundant.  This field is
	// still required because a non-conformant file with with explicitVR
	// encoding may have an element with VR that's different from the
	// standard's. In such case, this library honors the VR value found in
	// the file, and this field stores the VR used for parsing Values[].
	VR string

	// UndefinedLength is true if, in the DICOM file, the element is encoded
	// as having undefined length, and is delimited by end-sequence or
	// end-item element.  This flag is meaningful only if VR=="SQ" or
	// VR=="NA". Feel free to ignore this field if you don't understand what
	// this means.  It's one of the pointless complexities in the DICOM
	// standard.
	UndefinedLength bool
}

type EncapsulatedFrame struct {
	// Data is a collection of bytes representing a JPEG encoded image frame
	Data []byte
}

type Frame struct {
	IsEncapsulated   bool
	EncapsulatedData EncapsulatedFrame
	NativeData       NativeFrame
}

type NativeFrame struct {
	// Data is a slice of pixels, where each pixel can have multiple values
	Data          [][]int
	Rows          int
	Cols          int
	BitsPerSample int
}

type ParseOptions struct {
	// DropPixelData will cause the parser to skip the PixelData element
	// (bulk images) in ReadDataSet.
	DropPixelData bool

	// ReturnTags is a whitelist of tags to return.
	ReturnTags []dicomtag.Tag

	// StopAtag defines a tag at which when read (or a tag with a greater
	// value than it is read), the program will stop parsing the dicom file.
	StopAtTag *dicomtag.Tag
}

type Parser interface {
	// Parse DICOM data
	Parse(options ParseOptions) (*DataSet, error)
	// ParseNext reads and parses the next element
	ParseNext(options ParseOptions) *Element
	// DecoderError fetches an error (if exists) from the dicomio.Decoder
	DecoderError() error // This should go away as we continue refactors
	// Finish should be called after manually parsing elements using ParseNext (instead of Parse)
	Finish() error // This should maybe go away as we continue refactors
}

type PixelDataInfo struct {
	Offsets        []uint32 // BasicOffsetTable
	IsEncapsulated bool     // is the data encapsulated/jpeg encoded?
	Frames         []Frame  // Frames
}