// 17 july 2014

#include "winapi_windows.h"
#include "_cgo_export.h"

static LRESULT CALLBACK buttonSubProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR id, DWORD_PTR data)
{
	switch (uMsg) {
	case msgCOMMAND:
		if (HIWORD(wParam) == BN_CLICKED) {
			buttonClicked((void *) data);
			return 0;
		}
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	case WM_NCDESTROY:
		if ((*fv_RemoveWindowSubclass)(hwnd, buttonSubProc, id) == FALSE)
			xpanic("error removing Button subclass (which was for its own event handler)", GetLastError());
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	default:
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	}
	xmissedmsg("Button", "buttonSubProc()", uMsg);
	return 0;		// unreached
}

void setButtonSubclass(HWND hwnd, void *data)
{
	if ((*fv_SetWindowSubclass)(hwnd, buttonSubProc, 0, (DWORD_PTR) data) == FALSE)
		xpanic("error subclassing Button to give it its own event handler", GetLastError());
}

static LRESULT CALLBACK checkboxSubProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR id, DWORD_PTR data)
{
	switch (uMsg) {
	case msgCOMMAND:
		if (HIWORD(wParam) == BN_CLICKED) {
			WPARAM check;

			// we didn't use BS_AUTOCHECKBOX (see controls_windows.go) so we have to manage the check state ourselves
			check = BST_CHECKED;
			if (SendMessage(hwnd, BM_GETCHECK, 0, 0) == BST_CHECKED)
				check = BST_UNCHECKED;
			SendMessage(hwnd, BM_SETCHECK, check, 0);
			checkboxToggled((void *) data);
			return 0;
		}
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	case WM_NCDESTROY:
		if ((*fv_RemoveWindowSubclass)(hwnd, checkboxSubProc, id) == FALSE)
			xpanic("error removing Checkbox subclass (which was for its own event handler)", GetLastError());
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	default:
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	}
	xmissedmsg("Checkbox", "checkboxSubProc()", uMsg);
	return 0;		// unreached
}

void setCheckboxSubclass(HWND hwnd, void *data)
{
	if ((*fv_SetWindowSubclass)(hwnd, checkboxSubProc, 0, (DWORD_PTR) data) == FALSE)
		xpanic("error subclassing Checkbox to give it its own event handler", GetLastError());
}

BOOL checkboxChecked(HWND hwnd)
{
	if (SendMessage(hwnd, BM_GETCHECK, 0, 0) == BST_UNCHECKED)
		return FALSE;
	return TRUE;
}

void checkboxSetChecked(HWND hwnd, BOOL c)
{
	WPARAM check;

	check = BST_CHECKED;
	if (c == FALSE)
		check = BST_UNCHECKED;
	SendMessage(hwnd, BM_SETCHECK, check, 0);
}

static LRESULT CALLBACK textfieldSubProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR id, DWORD_PTR data)
{
	switch (uMsg) {
	case msgCOMMAND:
		if (HIWORD(wParam) == EN_CHANGE) {
			textfieldChanged((void *) data);
			return 0;
		}
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	case WM_NCDESTROY:
		if ((*fv_RemoveWindowSubclass)(hwnd, textfieldSubProc, id) == FALSE)
			xpanic("error removing TextField subclass (which was for its own event handler)", GetLastError());
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	default:
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	}
	xmissedmsg("TextField", "textfieldSubProc()", uMsg);
	return 0;		// unreached
}

void setTextFieldSubclass(HWND hwnd, void *data)
{
	if ((*fv_SetWindowSubclass)(hwnd, textfieldSubProc, 0, (DWORD_PTR) data) == FALSE)
		xpanic("error subclassing TextField to give it its own event handler", GetLastError());
}

void textfieldSetAndShowInvalidBalloonTip(HWND hwnd, WCHAR *text)
{
	EDITBALLOONTIP ti;

	ZeroMemory(&ti, sizeof (EDITBALLOONTIP));
	ti.cbStruct = sizeof (EDITBALLOONTIP);
	// this is required to show the error icon
	// this probably should be localized...
	ti.pszTitle = L"Invalid Input";
	ti.pszText = text;
	ti.ttiIcon = TTI_ERROR;
	if (SendMessageW(hwnd, EM_SHOWBALLOONTIP, 0, (LPARAM) (&ti)) == FALSE)
		xpanic("error showing TextField.Invalid() balloon tip", GetLastError());
	if (MessageBeep(0xFFFFFFFF) == 0)
		xpanic("error beeping in response to TextField.Invalid()", GetLastError());
}

void textfieldHideInvalidBalloonTip(HWND hwnd)
{
	if (SendMessageW(hwnd, EM_HIDEBALLOONTIP, 0, 0) == FALSE)
		xpanic("error hiding TextField.Invalid() balloon tip", GetLastError());
}

// also good for Textbox
int textfieldReadOnly(HWND hwnd)
{
	return (GetWindowLongPtrW(hwnd, GWL_STYLE) & ES_READONLY) != 0;
}

// also good for Textbox
void textfieldSetReadOnly(HWND hwnd, BOOL readonly)
{
	if (SendMessageW(hwnd, EM_SETREADONLY, (WPARAM) readonly, 0) == 0)
		xpanic("error setting TextField/Textbox as read-only/not read-only", GetLastError());
}

static LRESULT CALLBACK groupSubProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR id, DWORD_PTR data)
{
	LRESULT lResult;
	RECT r;

	if (sharedWndProc(hwnd, uMsg, wParam, lParam, &lResult))
		return lResult;
	switch (uMsg) {
	// don't do this on WM_WINDOWPOSCHANGING; weird redraw issues will happen
	case WM_WINDOWPOSCHANGED:
		// don't use the WINDOWPOS rect here; the coordinates of the controls have to be in real client coordinates
		if (GetClientRect(hwnd, &r) == 0)
			xpanic("error getting client rect of Group for resizing its child Control", GetLastError());
		groupResized((void *) data, r);
		// and chain up
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	case WM_NCDESTROY:
		if ((*fv_RemoveWindowSubclass)(hwnd, groupSubProc, id) == FALSE)
			xpanic("error removing Group subclass (which was for its own event handler)", GetLastError());
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	default:
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	}
	xmissedmsg("Group", "groupSubProc()", uMsg);
	return 0;		// unreached
}

void setGroupSubclass(HWND hwnd, void *data)
{
	if ((*fv_SetWindowSubclass)(hwnd, groupSubProc, 0, (DWORD_PTR) data) == FALSE)
		xpanic("error subclassing Group to give it its own event handler", GetLastError());
}

static LRESULT CALLBACK updownSubProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR id, DWORD_PTR data)
{
	NMHDR *nmhdr = (NMHDR *) lParam;

	switch (uMsg) {
	case msgNOTIFY:
		switch (nmhdr->code) {
		case UDN_DELTAPOS:
			spinboxUpDownClicked((void *) data, (NMUPDOWN *) lParam);
			return FALSE;			// allow change
		}
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	case WM_NCDESTROY:
		if ((*fv_RemoveWindowSubclass)(hwnd, updownSubProc, id) == FALSE)
			xpanic("error removing Spinbox up-down control subclass (which was for its own event handler)", GetLastError());
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	default:
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	}
	xmissedmsg("Spinbox up-down control", "updownSubProc()", uMsg);
	return 0;		// unreached
}

HWND newUpDown(HWND prevUpDown, void *data)
{
	HWND hwnd;
	HWND parent;

	parent = msgwin;		// for the first up-down
	if (prevUpDown != NULL) {
		parent = GetParent(prevUpDown);
		if (parent == NULL)
			xpanic("error getting parent of old up-down in Spinbox resize for new up-down", GetLastError());
		if (DestroyWindow(prevUpDown) == 0)
			xpanic("error destroying previous up-down in Spinbox resize", GetLastError());
	}
	hwnd = CreateWindowExW(0,
		UPDOWN_CLASSW, L"",
		// no WS_VISIBLE; we set visibility ourselves
		WS_CHILD | UDS_ALIGNRIGHT | UDS_ARROWKEYS | UDS_HOTTRACK | UDS_NOTHOUSANDS | UDS_SETBUDDYINT,
		// this is important; it's necessary for autosizing to work
		0, 0, 0, 0,
		parent, NULL, hInstance, NULL);
	if (hwnd == NULL)
		xpanic("error creating up-down control for Spinbox", GetLastError());
	if ((*fv_SetWindowSubclass)(hwnd, updownSubProc, 0, (DWORD_PTR) data) == FALSE)
		xpanic("error subclassing Spinbox up-down control to give it its own event handler", GetLastError());
	return hwnd;
}

static LRESULT CALLBACK spinboxEditSubProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR id, DWORD_PTR data)
{
	switch (uMsg) {
	case msgCOMMAND:
		if (HIWORD(wParam) == EN_CHANGE) {
			spinboxEditChanged((void *) data);
			return 0;
		}
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	case WM_NCDESTROY:
		if ((*fv_RemoveWindowSubclass)(hwnd, spinboxEditSubProc, id) == FALSE)
			xpanic("error removing Spinbox edit control subclass (which was for its own event handler)", GetLastError());
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	default:
		return (*fv_DefSubclassProc)(hwnd, uMsg, wParam, lParam);
	}
	xmissedmsg("Spinbox edit control", "spinboxEditSubProc()", uMsg);
	return 0;		// unreached
}

void setSpinboxEditSubclass(HWND hwnd, void *data)
{
	if ((*fv_SetWindowSubclass)(hwnd, spinboxEditSubProc, 0, (DWORD_PTR) data) == FALSE)
		xpanic("error subclassing Spinbox edit control to give it its own event handler", GetLastError());
}

// provided for cgo's benefit
LPWSTR xPROGRESS_CLASS = PROGRESS_CLASS;