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// Copyright 2010 The Walk Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package walk

import (
"syscall"
"unsafe"
)

import . "github.com/lxn/go-winapi"

const (
DlgCmdOK = IDOK
DlgCmdCancel = IDCANCEL
DlgCmdAbort = IDABORT
DlgCmdRetry = IDRETRY
DlgCmdIgnore = IDIGNORE
DlgCmdYes = IDYES
DlgCmdNo = IDNO
DlgCmdClose = IDCLOSE
DlgCmdHelp = IDHELP
DlgCmdTryAgain = IDTRYAGAIN
DlgCmdContinue = IDCONTINUE
DlgCmdTimeout = IDTIMEOUT
)

const dialogWindowClass = `\o/ Walk_Dialog_Class \o/`

func init() {
MustRegisterWindowClass(dialogWindowClass)
}

type dialogish interface {
DefaultButton() *PushButton
CancelButton() *PushButton
}

type Dialog struct {
TopLevelWindow
result int
defaultButton *PushButton
cancelButton *PushButton
centerInOwnerWhenRun bool
}

func NewDialog(owner RootWidget) (*Dialog, error) {
dlg := &Dialog{
TopLevelWindow: TopLevelWindow{
owner: owner,
},
}

if err := InitWidget(
dlg,
owner,
dialogWindowClass,
WS_CAPTION|WS_SYSMENU|WS_THICKFRAME,
WS_EX_DLGMODALFRAME); err != nil {
return nil, err
}

dlg.centerInOwnerWhenRun = owner != nil

dlg.children = newWidgetList(dlg)

// This forces display of focus rectangles, as soon as the user starts to type.
dlg.SendMessage(WM_CHANGEUISTATE, UIS_INITIALIZE, 0)

dlg.result = DlgCmdClose

return dlg, nil
}

func (dlg *Dialog) DefaultButton() *PushButton {
return dlg.defaultButton
}

func (dlg *Dialog) SetDefaultButton(button *PushButton) error {
if button != nil && !IsChild(dlg.hWnd, button.hWnd) {
return newError("not a descendant of the dialog")
}

succeeded := false
if dlg.defaultButton != nil {
if err := dlg.defaultButton.setAndClearStyleBits(BS_PUSHBUTTON, BS_DEFPUSHBUTTON); err != nil {
return err
}
defer func() {
if !succeeded {
dlg.defaultButton.setAndClearStyleBits(BS_DEFPUSHBUTTON, BS_PUSHBUTTON)
}
}()
}

if button != nil {
if err := button.setAndClearStyleBits(BS_DEFPUSHBUTTON, BS_PUSHBUTTON); err != nil {
return err
}
}

dlg.defaultButton = button

succeeded = true

return nil
}

func (dlg *Dialog) CancelButton() *PushButton {
return dlg.cancelButton
}

func (dlg *Dialog) SetCancelButton(button *PushButton) error {
if button != nil && !IsChild(dlg.hWnd, button.hWnd) {
return newError("not a descendant of the dialog")
}

dlg.cancelButton = button

return nil
}

func (dlg *Dialog) Accept() {
dlg.Close(DlgCmdOK)
}

func (dlg *Dialog) Cancel() {
dlg.Close(DlgCmdCancel)
}

func (dlg *Dialog) Close(result int) {
dlg.result = result

dlg.TopLevelWindow.Close()
}

func firstFocusableDescendantCallback(hwnd HWND, lParam uintptr) uintptr {
widget := widgetFromHWND(hwnd)

if widget == nil || !widget.Visible() || !widget.Enabled() {
return 1
}

style := uint(GetWindowLong(hwnd, GWL_STYLE))
// FIXME: Ugly workaround for NumberEdit
_, isTextSelectable := widget.(textSelectable)
if style&WS_TABSTOP > 0 || isTextSelectable {
hwndPtr := (*HWND)(unsafe.Pointer(lParam))
*hwndPtr = hwnd
return 0
}

return 1
}

var firstFocusableDescendantCallbackPtr = syscall.NewCallback(firstFocusableDescendantCallback)

func firstFocusableDescendant(container Container) Widget {
var hwnd HWND

EnumChildWindows(container.BaseWidget().hWnd, firstFocusableDescendantCallbackPtr, uintptr(unsafe.Pointer(&hwnd)))

return widgetFromHWND(hwnd)
}

type textSelectable interface {
SetTextSelection(start, end int)
}

func (dlg *Dialog) focusFirstCandidateDescendant() {
widget := firstFocusableDescendant(dlg)
if widget == nil {
return
}

if err := widget.SetFocus(); err != nil {
return
}

if textSel, ok := widget.(textSelectable); ok {
textSel.SetTextSelection(0, -1)
}
}

func (dlg *Dialog) Show() {
if dlg.owner != nil {
ob := dlg.owner.Bounds()
b := dlg.Bounds()
if dlg.centerInOwnerWhenRun {
dlg.SetBounds(Rectangle{
ob.X + (ob.Width-b.Width)/2,
ob.Y + (ob.Height-b.Height)/2,
b.Width,
b.Height,
})
}
} else {
dlg.SetBounds(dlg.Bounds())
}

dlg.TopLevelWindow.Show()

dlg.focusFirstCandidateDescendant()
}

func (dlg *Dialog) Run() int {
dlg.Show()

if dlg.owner != nil {
dlg.owner.SetEnabled(false)
}

dlg.TopLevelWindow.Run()

return dlg.result
}
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