// Package shm is the X client API for the MIT-SHM extension.
package shm

// This file is automatically generated from shm.xml. Edit at your peril!

import (
	xgb "janouch.name/haven/nexgb"

	"janouch.name/haven/nexgb/xproto"
)

const (
	MajorVersion = 1
	MinorVersion = 2
)

// Init must be called before using the MIT-SHM extension.
func Init(c *xgb.Conn) error {
	reply, err := xproto.QueryExtension(c, 7, "MIT-SHM").Reply()
	switch {
	case err != nil:
		return err
	case !reply.Present:
		return xgb.Errorf("No extension named MIT-SHM could be found on on the server.")
	}

	c.ExtLock.Lock()
	c.Extensions["MIT-SHM"] = reply.MajorOpcode
	c.ExtLock.Unlock()
	for evNum, fun := range xgb.NewExtEventFuncs["MIT-SHM"] {
		xgb.NewEventFuncs[int(reply.FirstEvent)+evNum] = fun
	}
	for errNum, fun := range xgb.NewExtErrorFuncs["MIT-SHM"] {
		xgb.NewErrorFuncs[int(reply.FirstError)+errNum] = fun
	}
	return nil
}

func init() {
	xgb.NewExtEventFuncs["MIT-SHM"] = make(map[int]xgb.NewEventFun)
	xgb.NewExtErrorFuncs["MIT-SHM"] = make(map[int]xgb.NewErrorFun)
}

// BadBadSeg is the error number for a BadBadSeg.
const BadBadSeg = 0

type BadSegError xproto.ValueError

// BadSegErrorNew constructs a BadSegError value that implements xgb.Error from a byte slice.
func BadSegErrorNew(buf []byte) xgb.Error {
	v := BadSegError(xproto.ValueErrorNew(buf).(xproto.ValueError))
	v.NiceName = "BadSeg"
	return v
}

// SequenceId returns the sequence id attached to the BadBadSeg error.
// This is mostly used internally.
func (err BadSegError) SequenceId() uint16 {
	return err.Sequence
}

// BadId returns the 'BadValue' number if one exists for the BadBadSeg error. If no bad value exists, 0 is returned.
func (err BadSegError) BadId() uint32 {
	return 0
}

// Error returns a rudimentary string representation of the BadBadSeg error.
func (err BadSegError) Error() string {
	fieldVals := make([]string, 0, 4)
	fieldVals = append(fieldVals, "NiceName: "+err.NiceName)
	fieldVals = append(fieldVals, xgb.Sprintf("Sequence: %d", err.Sequence))
	fieldVals = append(fieldVals, xgb.Sprintf("BadValue: %d", err.BadValue))
	fieldVals = append(fieldVals, xgb.Sprintf("MinorOpcode: %d", err.MinorOpcode))
	fieldVals = append(fieldVals, xgb.Sprintf("MajorOpcode: %d", err.MajorOpcode))
	return "BadBadSeg {" + xgb.StringsJoin(fieldVals, ", ") + "}"
}

func init() {
	xgb.NewExtErrorFuncs["MIT-SHM"][0] = BadSegErrorNew
}

// Completion is the event number for a CompletionEvent.
const Completion = 0

type CompletionEvent struct {
	Sequence uint16
	// padding: 1 bytes
	Drawable   xproto.Drawable
	MinorEvent uint16
	MajorEvent byte
	// padding: 1 bytes
	Shmseg Seg
	Offset uint32
}

// CompletionEventNew constructs a CompletionEvent value that implements xgb.Event from a byte slice.
func CompletionEventNew(buf []byte) xgb.Event {
	v := CompletionEvent{}
	b := 1 // don't read event number

	b += 1 // padding

	v.Sequence = xgb.Get16(buf[b:])
	b += 2

	v.Drawable = xproto.Drawable(xgb.Get32(buf[b:]))
	b += 4

	v.MinorEvent = xgb.Get16(buf[b:])
	b += 2

	v.MajorEvent = buf[b]
	b += 1

	b += 1 // padding

	v.Shmseg = Seg(xgb.Get32(buf[b:]))
	b += 4

	v.Offset = xgb.Get32(buf[b:])
	b += 4

	return v
}

// Bytes writes a CompletionEvent value to a byte slice.
func (v CompletionEvent) Bytes() []byte {
	buf := make([]byte, 32)
	b := 0

	// write event number
	buf[b] = 0
	b += 1

	b += 1 // padding

	b += 2 // skip sequence number

	xgb.Put32(buf[b:], uint32(v.Drawable))
	b += 4

	xgb.Put16(buf[b:], v.MinorEvent)
	b += 2

	buf[b] = v.MajorEvent
	b += 1

	b += 1 // padding

	xgb.Put32(buf[b:], uint32(v.Shmseg))
	b += 4

	xgb.Put32(buf[b:], v.Offset)
	b += 4

	return buf
}

// SequenceId returns the sequence id attached to the Completion event.
// Events without a sequence number (KeymapNotify) return 0.
// This is mostly used internally.
func (v CompletionEvent) SequenceId() uint16 {
	return v.Sequence
}

// String is a rudimentary string representation of CompletionEvent.
func (v CompletionEvent) String() string {
	fieldVals := make([]string, 0, 7)
	fieldVals = append(fieldVals, xgb.Sprintf("Sequence: %d", v.Sequence))
	fieldVals = append(fieldVals, xgb.Sprintf("Drawable: %d", v.Drawable))
	fieldVals = append(fieldVals, xgb.Sprintf("MinorEvent: %d", v.MinorEvent))
	fieldVals = append(fieldVals, xgb.Sprintf("MajorEvent: %d", v.MajorEvent))
	fieldVals = append(fieldVals, xgb.Sprintf("Shmseg: %d", v.Shmseg))
	fieldVals = append(fieldVals, xgb.Sprintf("Offset: %d", v.Offset))
	return "Completion {" + xgb.StringsJoin(fieldVals, ", ") + "}"
}

func init() {
	xgb.NewExtEventFuncs["MIT-SHM"][0] = CompletionEventNew
}

type Seg uint32

func NewSegId(c *xgb.Conn) (Seg, error) {
	id, err := c.NewId()
	if err != nil {
		return 0, err
	}
	return Seg(id), nil
}

// Skipping definition for base type 'Bool'

// Skipping definition for base type 'Byte'

// Skipping definition for base type 'Card8'

// Skipping definition for base type 'Char'

// Skipping definition for base type 'Void'

// Skipping definition for base type 'Double'

// Skipping definition for base type 'Float'

// Skipping definition for base type 'Int16'

// Skipping definition for base type 'Int32'

// Skipping definition for base type 'Int8'

// Skipping definition for base type 'Card16'

// Skipping definition for base type 'Card32'

// AttachCookie is a cookie used only for Attach requests.
type AttachCookie struct {
	*xgb.Cookie
}

// Attach sends an unchecked request.
// If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
func Attach(c *xgb.Conn, Shmseg Seg, Shmid uint32, ReadOnly bool) AttachCookie {
	c.ExtLock.RLock()
	defer c.ExtLock.RUnlock()
	if _, ok := c.Extensions["MIT-SHM"]; !ok {
		panic("Cannot issue request 'Attach' using the uninitialized extension 'MIT-SHM'. shm.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(false, false)
	c.NewRequest(attachRequest(c, Shmseg, Shmid, ReadOnly), cookie)
	return AttachCookie{cookie}
}

// AttachChecked sends a checked request.
// If an error occurs, it can be retrieved using AttachCookie.Check.
func AttachChecked(c *xgb.Conn, Shmseg Seg, Shmid uint32, ReadOnly bool) AttachCookie {
	c.ExtLock.RLock()
	defer c.ExtLock.RUnlock()
	if _, ok := c.Extensions["MIT-SHM"]; !ok {
		panic("Cannot issue request 'Attach' using the uninitialized extension 'MIT-SHM'. shm.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(true, false)
	c.NewRequest(attachRequest(c, Shmseg, Shmid, ReadOnly), cookie)
	return AttachCookie{cookie}
}

// Check returns an error if one occurred for checked requests that are not expecting a reply.
// This cannot be called for requests expecting a reply, nor for unchecked requests.
func (cook AttachCookie) Check() error {
	return cook.Cookie.Check()
}

// attachRequest writes a Attach request to a byte slice for transfer.
func attachRequest(c *xgb.Conn, Shmseg Seg, Shmid uint32, ReadOnly bool) []byte {
	size := 16
	b := 0
	buf := make([]byte, size)

	c.ExtLock.RLock()
	buf[b] = c.Extensions["MIT-SHM"]
	c.ExtLock.RUnlock()
	b += 1

	buf[b] = 1 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(Shmseg))
	b += 4

	xgb.Put32(buf[b:], Shmid)
	b += 4

	if ReadOnly {
		buf[b] = 1
	} else {
		buf[b] = 0
	}
	b += 1

	b += 3 // padding

	return buf
}

// AttachFdCookie is a cookie used only for AttachFd requests.
type AttachFdCookie struct {
	*xgb.Cookie
}

// AttachFd sends an unchecked request.
// If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
func AttachFd(c *xgb.Conn, Shmseg Seg, ReadOnly bool) AttachFdCookie {
	c.ExtLock.RLock()
	defer c.ExtLock.RUnlock()
	if _, ok := c.Extensions["MIT-SHM"]; !ok {
		panic("Cannot issue request 'AttachFd' using the uninitialized extension 'MIT-SHM'. shm.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(false, false)
	c.NewRequest(attachFdRequest(c, Shmseg, ReadOnly), cookie)
	return AttachFdCookie{cookie}
}

// AttachFdChecked sends a checked request.
// If an error occurs, it can be retrieved using AttachFdCookie.Check.
func AttachFdChecked(c *xgb.Conn, Shmseg Seg, ReadOnly bool) AttachFdCookie {
	c.ExtLock.RLock()
	defer c.ExtLock.RUnlock()
	if _, ok := c.Extensions["MIT-SHM"]; !ok {
		panic("Cannot issue request 'AttachFd' using the uninitialized extension 'MIT-SHM'. shm.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(true, false)
	c.NewRequest(attachFdRequest(c, Shmseg, ReadOnly), cookie)
	return AttachFdCookie{cookie}
}

// Check returns an error if one occurred for checked requests that are not expecting a reply.
// This cannot be called for requests expecting a reply, nor for unchecked requests.
func (cook AttachFdCookie) Check() error {
	return cook.Cookie.Check()
}

// attachFdRequest writes a AttachFd request to a byte slice for transfer.
func attachFdRequest(c *xgb.Conn, Shmseg Seg, ReadOnly bool) []byte {
	size := 12
	b := 0
	buf := make([]byte, size)

	c.ExtLock.RLock()
	buf[b] = c.Extensions["MIT-SHM"]
	c.ExtLock.RUnlock()
	b += 1

	buf[b] = 6 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(Shmseg))
	b += 4

	if ReadOnly {
		buf[b] = 1
	} else {
		buf[b] = 0
	}
	b += 1

	b += 3 // padding

	return buf
}

// CreatePixmapCookie is a cookie used only for CreatePixmap requests.
type CreatePixmapCookie struct {
	*xgb.Cookie
}

// CreatePixmap sends an unchecked request.
// If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
func CreatePixmap(c *xgb.Conn, Pid xproto.Pixmap, Drawable xproto.Drawable, Width, Height uint16, Depth byte, Shmseg Seg, Offset uint32) CreatePixmapCookie {
	c.ExtLock.RLock()
	defer c.ExtLock.RUnlock()
	if _, ok := c.Extensions["MIT-SHM"]; !ok {
		panic("Cannot issue request 'CreatePixmap' using the uninitialized extension 'MIT-SHM'. shm.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(false, false)
	c.NewRequest(createPixmapRequest(c, Pid, Drawable, Width, Height, Depth, Shmseg, Offset), cookie)
	return CreatePixmapCookie{cookie}
}

// CreatePixmapChecked sends a checked request.
// If an error occurs, it can be retrieved using CreatePixmapCookie.Check.
func CreatePixmapChecked(c *xgb.Conn, Pid xproto.Pixmap, Drawable xproto.Drawable, Width, Height uint16, Depth byte, Shmseg Seg, Offset uint32) CreatePixmapCookie {
	c.ExtLock.RLock()
	defer c.ExtLock.RUnlock()
	if _, ok := c.Extensions["MIT-SHM"]; !ok {
		panic("Cannot issue request 'CreatePixmap' using the uninitialized extension 'MIT-SHM'. shm.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(true, false)
	c.NewRequest(createPixmapRequest(c, Pid, Drawable, Width, Height, Depth, Shmseg, Offset), cookie)
	return CreatePixmapCookie{cookie}
}

// Check returns an error if one occurred for checked requests that are not expecting a reply.
// This cannot be called for requests expecting a reply, nor for unchecked requests.
func (cook CreatePixmapCookie) Check() error {
	return cook.Cookie.Check()
}

// createPixmapRequest writes a CreatePixmap request to a byte slice for transfer.
func createPixmapRequest(c *xgb.Conn, Pid xproto.Pixmap, Drawable xproto.Drawable, Width, Height uint16, Depth byte, Shmseg Seg, Offset uint32) []byte {
	size := 28
	b := 0
	buf := make([]byte, size)

	c.ExtLock.RLock()
	buf[b] = c.Extensions["MIT-SHM"]
	c.ExtLock.RUnlock()
	b += 1

	buf[b] = 5 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(Pid))
	b += 4

	xgb.Put32(buf[b:], uint32(Drawable))
	b += 4

	xgb.Put16(buf[b:], Width)
	b += 2

	xgb.Put16(buf[b:], Height)
	b += 2

	buf[b] = Depth
	b += 1

	b += 3 // padding

	xgb.Put32(buf[b:], uint32(Shmseg))
	b += 4

	xgb.Put32(buf[b:], Offset)
	b += 4

	return buf
}

// CreateSegmentCookie is a cookie used only for CreateSegment requests.
type CreateSegmentCookie struct {
	*xgb.Cookie
}

// CreateSegment sends a checked request.
// If an error occurs, it will be returned with the reply by calling CreateSegmentCookie.Reply.
func CreateSegment(c *xgb.Conn, Shmseg Seg, Size uint32, ReadOnly bool) CreateSegmentCookie {
	c.ExtLock.RLock()
	defer c.ExtLock.RUnlock()
	if _, ok := c.Extensions["MIT-SHM"]; !ok {
		panic("Cannot issue request 'CreateSegment' using the uninitialized extension 'MIT-SHM'. shm.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(true, true)
	c.NewRequest(createSegmentRequest(c, Shmseg, Size, ReadOnly), cookie)
	return CreateSegmentCookie{cookie}
}

// CreateSegmentUnchecked sends an unchecked request.
// If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
func CreateSegmentUnchecked(c *xgb.Conn, Shmseg Seg, Size uint32, ReadOnly bool) CreateSegmentCookie {
	c.ExtLock.RLock()
	defer c.ExtLock.RUnlock()
	if _, ok := c.Extensions["MIT-SHM"]; !ok {
		panic("Cannot issue request 'CreateSegment' using the uninitialized extension 'MIT-SHM'. shm.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(false, true)
	c.NewRequest(createSegmentRequest(c, Shmseg, Size, ReadOnly), cookie)
	return CreateSegmentCookie{cookie}
}

// CreateSegmentReply represents the data returned from a CreateSegment request.
type CreateSegmentReply struct {
	Sequence uint16 // sequence number of the request for this reply
	Length   uint32 // number of bytes in this reply
	Nfd      byte
	// padding: 24 bytes
}

// Reply blocks and returns the reply data for a CreateSegment request.
func (cook CreateSegmentCookie) Reply() (*CreateSegmentReply, error) {
	buf, err := cook.Cookie.Reply()
	if err != nil {
		return nil, err
	}
	if buf == nil {
		return nil, nil
	}
	return createSegmentReply(buf), nil
}

// createSegmentReply reads a byte slice into a CreateSegmentReply value.
func createSegmentReply(buf []byte) *CreateSegmentReply {
	v := new(CreateSegmentReply)
	b := 1 // skip reply determinant

	v.Nfd = buf[b]
	b += 1

	v.Sequence = xgb.Get16(buf[b:])
	b += 2

	v.Length = xgb.Get32(buf[b:]) // 4-byte units
	b += 4

	b += 24 // padding

	return v
}

// createSegmentRequest writes a CreateSegment request to a byte slice for transfer.
func createSegmentRequest(c *xgb.Conn, Shmseg Seg, Size uint32, ReadOnly bool) []byte {
	size := 16
	b := 0
	buf := make([]byte, size)

	c.ExtLock.RLock()
	buf[b] = c.Extensions["MIT-SHM"]
	c.ExtLock.RUnlock()
	b += 1

	buf[b] = 7 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(Shmseg))
	b += 4

	xgb.Put32(buf[b:], Size)
	b += 4

	if ReadOnly {
		buf[b] = 1
	} else {
		buf[b] = 0
	}
	b += 1

	b += 3 // padding

	return buf
}

// DetachCookie is a cookie used only for Detach requests.
type DetachCookie struct {
	*xgb.Cookie
}

// Detach sends an unchecked request.
// If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
func Detach(c *xgb.Conn, Shmseg Seg) DetachCookie {
	c.ExtLock.RLock()
	defer c.ExtLock.RUnlock()
	if _, ok := c.Extensions["MIT-SHM"]; !ok {
		panic("Cannot issue request 'Detach' using the uninitialized extension 'MIT-SHM'. shm.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(false, false)
	c.NewRequest(detachRequest(c, Shmseg), cookie)
	return DetachCookie{cookie}
}

// DetachChecked sends a checked request.
// If an error occurs, it can be retrieved using DetachCookie.Check.
func DetachChecked(c *xgb.Conn, Shmseg Seg) DetachCookie {
	c.ExtLock.RLock()
	defer c.ExtLock.RUnlock()
	if _, ok := c.Extensions["MIT-SHM"]; !ok {
		panic("Cannot issue request 'Detach' using the uninitialized extension 'MIT-SHM'. shm.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(true, false)
	c.NewRequest(detachRequest(c, Shmseg), cookie)
	return DetachCookie{cookie}
}

// Check returns an error if one occurred for checked requests that are not expecting a reply.
// This cannot be called for requests expecting a reply, nor for unchecked requests.
func (cook DetachCookie) Check() error {
	return cook.Cookie.Check()
}

// detachRequest writes a Detach request to a byte slice for transfer.
func detachRequest(c *xgb.Conn, Shmseg Seg) []byte {
	size := 8
	b := 0
	buf := make([]byte, size)

	c.ExtLock.RLock()
	buf[b] = c.Extensions["MIT-SHM"]
	c.ExtLock.RUnlock()
	b += 1

	buf[b] = 2 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(Shmseg))
	b += 4

	return buf
}

// GetImageCookie is a cookie used only for GetImage requests.
type GetImageCookie struct {
	*xgb.Cookie
}

// GetImage sends a checked request.
// If an error occurs, it will be returned with the reply by calling GetImageCookie.Reply.
func GetImage(c *xgb.Conn, Drawable xproto.Drawable, X, Y int16, Width, Height uint16, PlaneMask uint32, Format byte, Shmseg Seg, Offset uint32) GetImageCookie {
	c.ExtLock.RLock()
	defer c.ExtLock.RUnlock()
	if _, ok := c.Extensions["MIT-SHM"]; !ok {
		panic("Cannot issue request 'GetImage' using the uninitialized extension 'MIT-SHM'. shm.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(true, true)
	c.NewRequest(getImageRequest(c, Drawable, X, Y, Width, Height, PlaneMask, Format, Shmseg, Offset), cookie)
	return GetImageCookie{cookie}
}

// GetImageUnchecked sends an unchecked request.
// If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
func GetImageUnchecked(c *xgb.Conn, Drawable xproto.Drawable, X, Y int16, Width, Height uint16, PlaneMask uint32, Format byte, Shmseg Seg, Offset uint32) GetImageCookie {
	c.ExtLock.RLock()
	defer c.ExtLock.RUnlock()
	if _, ok := c.Extensions["MIT-SHM"]; !ok {
		panic("Cannot issue request 'GetImage' using the uninitialized extension 'MIT-SHM'. shm.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(false, true)
	c.NewRequest(getImageRequest(c, Drawable, X, Y, Width, Height, PlaneMask, Format, Shmseg, Offset), cookie)
	return GetImageCookie{cookie}
}

// GetImageReply represents the data returned from a GetImage request.
type GetImageReply struct {
	Sequence uint16 // sequence number of the request for this reply
	Length   uint32 // number of bytes in this reply
	Depth    byte
	Visual   xproto.Visualid
	Size     uint32
}

// Reply blocks and returns the reply data for a GetImage request.
func (cook GetImageCookie) Reply() (*GetImageReply, error) {
	buf, err := cook.Cookie.Reply()
	if err != nil {
		return nil, err
	}
	if buf == nil {
		return nil, nil
	}
	return getImageReply(buf), nil
}

// getImageReply reads a byte slice into a GetImageReply value.
func getImageReply(buf []byte) *GetImageReply {
	v := new(GetImageReply)
	b := 1 // skip reply determinant

	v.Depth = buf[b]
	b += 1

	v.Sequence = xgb.Get16(buf[b:])
	b += 2

	v.Length = xgb.Get32(buf[b:]) // 4-byte units
	b += 4

	v.Visual = xproto.Visualid(xgb.Get32(buf[b:]))
	b += 4

	v.Size = xgb.Get32(buf[b:])
	b += 4

	return v
}

// getImageRequest writes a GetImage request to a byte slice for transfer.
func getImageRequest(c *xgb.Conn, Drawable xproto.Drawable, X, Y int16, Width, Height uint16, PlaneMask uint32, Format byte, Shmseg Seg, Offset uint32) []byte {
	size := 32
	b := 0
	buf := make([]byte, size)

	c.ExtLock.RLock()
	buf[b] = c.Extensions["MIT-SHM"]
	c.ExtLock.RUnlock()
	b += 1

	buf[b] = 4 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(Drawable))
	b += 4

	xgb.Put16(buf[b:], uint16(X))
	b += 2

	xgb.Put16(buf[b:], uint16(Y))
	b += 2

	xgb.Put16(buf[b:], Width)
	b += 2

	xgb.Put16(buf[b:], Height)
	b += 2

	xgb.Put32(buf[b:], PlaneMask)
	b += 4

	buf[b] = Format
	b += 1

	b += 3 // padding

	xgb.Put32(buf[b:], uint32(Shmseg))
	b += 4

	xgb.Put32(buf[b:], Offset)
	b += 4

	return buf
}

// PutImageCookie is a cookie used only for PutImage requests.
type PutImageCookie struct {
	*xgb.Cookie
}

// PutImage sends an unchecked request.
// If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
func PutImage(c *xgb.Conn, Drawable xproto.Drawable, Gc xproto.Gcontext, TotalWidth, TotalHeight, SrcX, SrcY, SrcWidth, SrcHeight uint16, DstX, DstY int16, Depth, Format, SendEvent byte, Shmseg Seg, Offset uint32) PutImageCookie {
	c.ExtLock.RLock()
	defer c.ExtLock.RUnlock()
	if _, ok := c.Extensions["MIT-SHM"]; !ok {
		panic("Cannot issue request 'PutImage' using the uninitialized extension 'MIT-SHM'. shm.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(false, false)
	c.NewRequest(putImageRequest(c, Drawable, Gc, TotalWidth, TotalHeight, SrcX, SrcY, SrcWidth, SrcHeight, DstX, DstY, Depth, Format, SendEvent, Shmseg, Offset), cookie)
	return PutImageCookie{cookie}
}

// PutImageChecked sends a checked request.
// If an error occurs, it can be retrieved using PutImageCookie.Check.
func PutImageChecked(c *xgb.Conn, Drawable xproto.Drawable, Gc xproto.Gcontext, TotalWidth, TotalHeight, SrcX, SrcY, SrcWidth, SrcHeight uint16, DstX, DstY int16, Depth, Format, SendEvent byte, Shmseg Seg, Offset uint32) PutImageCookie {
	c.ExtLock.RLock()
	defer c.ExtLock.RUnlock()
	if _, ok := c.Extensions["MIT-SHM"]; !ok {
		panic("Cannot issue request 'PutImage' using the uninitialized extension 'MIT-SHM'. shm.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(true, false)
	c.NewRequest(putImageRequest(c, Drawable, Gc, TotalWidth, TotalHeight, SrcX, SrcY, SrcWidth, SrcHeight, DstX, DstY, Depth, Format, SendEvent, Shmseg, Offset), cookie)
	return PutImageCookie{cookie}
}

// Check returns an error if one occurred for checked requests that are not expecting a reply.
// This cannot be called for requests expecting a reply, nor for unchecked requests.
func (cook PutImageCookie) Check() error {
	return cook.Cookie.Check()
}

// putImageRequest writes a PutImage request to a byte slice for transfer.
func putImageRequest(c *xgb.Conn, Drawable xproto.Drawable, Gc xproto.Gcontext, TotalWidth, TotalHeight, SrcX, SrcY, SrcWidth, SrcHeight uint16, DstX, DstY int16, Depth, Format, SendEvent byte, Shmseg Seg, Offset uint32) []byte {
	size := 40
	b := 0
	buf := make([]byte, size)

	c.ExtLock.RLock()
	buf[b] = c.Extensions["MIT-SHM"]
	c.ExtLock.RUnlock()
	b += 1

	buf[b] = 3 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	xgb.Put32(buf[b:], uint32(Drawable))
	b += 4

	xgb.Put32(buf[b:], uint32(Gc))
	b += 4

	xgb.Put16(buf[b:], TotalWidth)
	b += 2

	xgb.Put16(buf[b:], TotalHeight)
	b += 2

	xgb.Put16(buf[b:], SrcX)
	b += 2

	xgb.Put16(buf[b:], SrcY)
	b += 2

	xgb.Put16(buf[b:], SrcWidth)
	b += 2

	xgb.Put16(buf[b:], SrcHeight)
	b += 2

	xgb.Put16(buf[b:], uint16(DstX))
	b += 2

	xgb.Put16(buf[b:], uint16(DstY))
	b += 2

	buf[b] = Depth
	b += 1

	buf[b] = Format
	b += 1

	buf[b] = SendEvent
	b += 1

	b += 1 // padding

	xgb.Put32(buf[b:], uint32(Shmseg))
	b += 4

	xgb.Put32(buf[b:], Offset)
	b += 4

	return buf
}

// QueryVersionCookie is a cookie used only for QueryVersion requests.
type QueryVersionCookie struct {
	*xgb.Cookie
}

// QueryVersion sends a checked request.
// If an error occurs, it will be returned with the reply by calling QueryVersionCookie.Reply.
func QueryVersion(c *xgb.Conn) QueryVersionCookie {
	c.ExtLock.RLock()
	defer c.ExtLock.RUnlock()
	if _, ok := c.Extensions["MIT-SHM"]; !ok {
		panic("Cannot issue request 'QueryVersion' using the uninitialized extension 'MIT-SHM'. shm.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(true, true)
	c.NewRequest(queryVersionRequest(c), cookie)
	return QueryVersionCookie{cookie}
}

// QueryVersionUnchecked sends an unchecked request.
// If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
func QueryVersionUnchecked(c *xgb.Conn) QueryVersionCookie {
	c.ExtLock.RLock()
	defer c.ExtLock.RUnlock()
	if _, ok := c.Extensions["MIT-SHM"]; !ok {
		panic("Cannot issue request 'QueryVersion' using the uninitialized extension 'MIT-SHM'. shm.Init(connObj) must be called first.")
	}
	cookie := c.NewCookie(false, true)
	c.NewRequest(queryVersionRequest(c), cookie)
	return QueryVersionCookie{cookie}
}

// QueryVersionReply represents the data returned from a QueryVersion request.
type QueryVersionReply struct {
	Sequence      uint16 // sequence number of the request for this reply
	Length        uint32 // number of bytes in this reply
	SharedPixmaps bool
	MajorVersion  uint16
	MinorVersion  uint16
	Uid           uint16
	Gid           uint16
	PixmapFormat  byte
	// padding: 15 bytes
}

// Reply blocks and returns the reply data for a QueryVersion request.
func (cook QueryVersionCookie) Reply() (*QueryVersionReply, error) {
	buf, err := cook.Cookie.Reply()
	if err != nil {
		return nil, err
	}
	if buf == nil {
		return nil, nil
	}
	return queryVersionReply(buf), nil
}

// queryVersionReply reads a byte slice into a QueryVersionReply value.
func queryVersionReply(buf []byte) *QueryVersionReply {
	v := new(QueryVersionReply)
	b := 1 // skip reply determinant

	if buf[b] == 1 {
		v.SharedPixmaps = true
	} else {
		v.SharedPixmaps = false
	}
	b += 1

	v.Sequence = xgb.Get16(buf[b:])
	b += 2

	v.Length = xgb.Get32(buf[b:]) // 4-byte units
	b += 4

	v.MajorVersion = xgb.Get16(buf[b:])
	b += 2

	v.MinorVersion = xgb.Get16(buf[b:])
	b += 2

	v.Uid = xgb.Get16(buf[b:])
	b += 2

	v.Gid = xgb.Get16(buf[b:])
	b += 2

	v.PixmapFormat = buf[b]
	b += 1

	b += 15 // padding

	return v
}

// queryVersionRequest writes a QueryVersion request to a byte slice for transfer.
func queryVersionRequest(c *xgb.Conn) []byte {
	size := 4
	b := 0
	buf := make([]byte, size)

	c.ExtLock.RLock()
	buf[b] = c.Extensions["MIT-SHM"]
	c.ExtLock.RUnlock()
	b += 1

	buf[b] = 0 // request opcode
	b += 1

	xgb.Put16(buf[b:], uint16(size/4)) // write request size in 4-byte units
	b += 2

	return buf
}