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// Copyright 2012 Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

import (
"fmt"
"log"
"reflect"
"strings"
"time"
"unsafe"
)

// #cgo LDFLAGS: -lmtp -L/usr/local/lib
// #include <libmtp.h>
// #include <stdlib.h>
import "C"

var _ = log.Println

/*
This file has a partial cgo wrapping for libmtp, so users should
never have to call import "C"
*/

// TODO - we leak C strings all over the place.

type Device C.LIBMTP_mtpdevice_t
type Error C.LIBMTP_error_t
type MtpError C.LIBMTP_error_number_t
type RawDevice C.LIBMTP_raw_device_t
type DeviceStorage C.LIBMTP_devicestorage_t
type Folder C.LIBMTP_folder_t
type File C.LIBMTP_file_t

const NOPARENT_ID = 0xFFFFFFFF
const DEBUG_PTP = int(C.LIBMTP_DEBUG_PTP)
const DEBUG_PLST = int(C.LIBMTP_DEBUG_PLST)
const DEBUG_USB = int(C.LIBMTP_DEBUG_USB)
const DEBUG_DATA = int(C.LIBMTP_DEBUG_DATA)
const DEBUG_ALL = int(C.LIBMTP_DEBUG_ALL)
const FILETYPE_FOLDER = int(C.LIBMTP_FILETYPE_FOLDER)
const FILETYPE_UNKNOWN = C.LIBMTP_FILETYPE_UNKNOWN

func Init() {
C.LIBMTP_Init()
}

func SetDebug(mask int) {
C.LIBMTP_Set_Debug(C.int(mask))
}

func Detect() (devs []*RawDevice, err error) {
var rawdevices *C.LIBMTP_raw_device_t
var numrawdevices C.int

errno := MtpError(C.LIBMTP_Detect_Raw_Devices(&rawdevices, &numrawdevices))
if errno == C.LIBMTP_ERROR_NO_DEVICE_ATTACHED {
return nil, nil
}
if errno != C.LIBMTP_ERROR_NONE {
return nil, errno
}
slice := &reflect.SliceHeader{uintptr(unsafe.Pointer(rawdevices)), int(numrawdevices), int(numrawdevices)}
rdevs := *(*[]RawDevice)(unsafe.Pointer(slice))

for _, d := range rdevs {
newD := d
devs = append(devs, &newD)
}

// todo dealloc rawdevices
return devs, nil
}

func (e MtpError) Error() string {
switch e {
case C.LIBMTP_ERROR_CONNECTING:
return "error connecting"
case C.LIBMTP_ERROR_MEMORY_ALLOCATION:
return "memory allocation error"
case C.LIBMTP_ERROR_GENERAL:
return "general error."
}
return "unknown error"
}

////////////////
// Raw devices.

func (r *RawDevice) me() *C.LIBMTP_raw_device_t {
return (*C.LIBMTP_raw_device_t)(r)
}

func (r *RawDevice) Open() (*Device, error) {
dev := C.LIBMTP_Open_Raw_Device_Uncached(r.me())
if dev == nil {
return nil, fmt.Errorf("open: open returned nil")
}
return (*Device)(dev), nil
}

func (d *RawDevice) String() string {
vendor := "unknown"
if d.device_entry.vendor != nil {
vendor = C.GoString(d.device_entry.vendor)
}
product := "unknown"
if d.device_entry.product != nil {
product = C.GoString(d.device_entry.product)
}

return fmt.Sprintf("%s: %s (%04x:%04x) @ bus %d, dev %d\n",
vendor, product,
d.device_entry.vendor_id,
d.device_entry.product_id,
d.bus_location,
d.devnum)
}

////////////////
// Device

func (d *Device) me() *C.LIBMTP_mtpdevice_t {
return (*C.LIBMTP_mtpdevice_t)(d)
}

func (d *Device) Release() {
C.LIBMTP_Release_Device(d.me())
}

func (d *Device) ErrorStack() error {
var messages []string
for p := C.LIBMTP_Get_Errorstack(d.me()); p != nil; p = p.next {
messages = append(messages, C.GoString(p.error_text))
}
if len(messages) == 0 {
return nil
}
C.LIBMTP_Clear_Errorstack(d.me())
return fmt.Errorf("%s", strings.Join(messages, "\n"))
}

func (d *Device) GetStorage(sortOrder int) error {
err := C.LIBMTP_Get_Storage(d.me(), C.int(sortOrder))
if err != 0 {
return d.ErrorStack()
}
return nil
}

func (d *Device) FilesAndFolders(storageId uint32, parentId uint32) (files []*File, err error) {
file := C.LIBMTP_Get_Files_And_Folders(d.me(), C.uint32_t(storageId), C.uint32_t(parentId))
for f := (*File)(file); f != nil; f = (*File)(f.next) {
files = append(files, f)
}
return files, d.ErrorStack()
}

func (d *Device) FolderList(s *DeviceStorage) (folders []*Folder) {
folder := C.LIBMTP_Get_Folder_List_For_Storage(d.me(), s.id)
for f := (*Folder)(folder); f != nil; f = (*Folder)(f.sibling) {
folders = append(folders, f)
}
return folders
}

func (d *Device) ListStorage() (storages []*DeviceStorage) {
for p := d.storage; p != nil; p = p.next {
storages = append(storages, (*DeviceStorage)(p))
}
return
}
func (d *Device) Filemetadata(id uint32) (*File, error) {
f := (C.LIBMTP_Get_Filemetadata(d.me(), C.uint32_t(id)))
return (*File)(f), d.ErrorStack()
}

func (d *Device) GetFileToFileDescriptor(id uint32, fd uintptr) error {
code := C.LIBMTP_Get_File_To_File_Descriptor(d.me(), C.uint32_t(id), C.int(fd), nil, nil)
if code != 0 {
return d.ErrorStack()
}

return nil
}

func (d *Device) SendFromFileDescriptor(file *File, fd uintptr) error {
code := C.LIBMTP_Send_File_From_File_Descriptor(d.me(), C.int(fd), (*C.LIBMTP_file_t)(file), nil, nil)
if code != 0 {
return d.ErrorStack()
}

return nil
}

func (d *Device) ModelName() (name string) {
cname := C.LIBMTP_Get_Modelname(d.me())
name = C.GoString(cname)
C.free(unsafe.Pointer(cname))
return name
}

func (d *Device) CreateFolder(parent uint32, name string, storage uint32) (uint32, error) {
cname := C.CString(name)
id := C.LIBMTP_Create_Folder(d.me(), cname, C.uint32_t(parent), C.uint32_t(storage))

if newName := C.GoString(cname); newName != name {
log.Println("Folder name changed to %q", newName)
}
C.free(unsafe.Pointer(cname))
return uint32(id), d.ErrorStack()
}

func (d *Device) SetFileName(f *File, name string) error {
C.LIBMTP_Set_File_Name(d.me(), f.me(), C.CString(name))
return d.ErrorStack()
}

func (d *Device) DeleteObject(id uint32) error {
c := C.LIBMTP_Delete_Object(d.me(), C.uint32_t(id))
if c != 0 {
return d.ErrorStack()
}
return nil
}

func (d *Device) GetStringFromObject(id uint32, prop int) (string, error) {
mId := C.uint32_t(id)
mProp := C.LIBMTP_property_t(prop)
cstr := C.LIBMTP_Get_String_From_Object(d.me(), mId, mProp)
result := C.GoString(cstr)
C.free(unsafe.Pointer(cstr))

return result, d.ErrorStack()
}

func (d *Device) GetIntFromObject(id uint32, prop int, bits int) (uint64, error) {
var result uint64
mId := C.uint32_t(id)
mProp := C.LIBMTP_property_t(prop)
switch (bits) {
case 64:
result = uint64(C.LIBMTP_Get_u64_From_Object(d.me(), mId, mProp, 0))
case 32:
result = uint64(C.LIBMTP_Get_u32_From_Object(d.me(), mId, mProp, 0))
case 16:
result = uint64(C.LIBMTP_Get_u16_From_Object(d.me(), mId, mProp, 0))
case 8:
result = uint64(C.LIBMTP_Get_u8_From_Object(d.me(), mId, mProp, 0))
default:
return 0, fmt.Errorf("unsupported bit size %d", bits)
}

return result, d.ErrorStack()
}
const DateModified = C.LIBMTP_PROPERTY_DateModified

////////////////
// DeviceStorage

func (d *DeviceStorage) me() *C.LIBMTP_devicestorage_t {
return (*C.LIBMTP_devicestorage_t)(d)
}

func (d *DeviceStorage) Id() uint32 {
return uint32(d.me().id)
}

func (d *DeviceStorage) Description() string {
return C.GoString(d.StorageDescription)
}

////////////////
// Files.

func NewFile(id uint32, parent uint32, storage_id uint32, filename string, size uint64,
mtime time.Time, fileType int) *File {
f := C.LIBMTP_new_file_t()
f.item_id = C.uint32_t(id)
f.parent_id = C.uint32_t(parent)
f.storage_id = C.uint32_t(storage_id)
f.filename = C.CString(filename)
f.filesize = C.uint64_t(size)
f.modificationdate = C.time_t(mtime.Unix())
f.filetype = C.LIBMTP_filetype_t(fileType)
return (*File)(f)
}

func (f *File) Destroy() {
C.LIBMTP_destroy_file_t(f.me())
}

func (f *File) me() *C.LIBMTP_file_t {
return (*C.LIBMTP_file_t)(f)
}

func (d *File) StorageId() uint32 {
return uint32(d.storage_id)
}

func (f *File) Mtime() time.Time {
return time.Unix(int64(f.modificationdate), 0)
}

func (f *File) SetMtime(t time.Time) {
f.modificationdate = C.time_t(t.Unix())
}

func (f *File) SetFilesize(sz uint64) {
f.filesize = C.uint64_t(sz)
}

func (d *File) Id() uint32 {
return uint32(d.item_id)
}

func (d *File) Filetype() int {
return int(d.filetype)
}

func (d *File) Name() string {
return C.GoString(d.filename)
}

func (f *File) SetName(n string) {
old := f.filename
C.free(unsafe.Pointer(old))
f.filename = C.CString(n)
}
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