// 16 july 2014

#import "objc_darwin.h"
#import "_cgo_export.h"
#import <Cocoa/Cocoa.h>

#define toNSButton(x) ((NSButton *) (x))
#define toNSTextField(x) ((NSTextField *) (x))
#define toNSView(x) ((NSView *) (x))
#define toNSPopover(x) ((NSPopover *) (x))
#define toNSBox(x) ((NSBox *) (x))

@interface goControlDelegate : NSObject <NSTextFieldDelegate> {
@public
	void *gocontrol;
}
@end

@implementation goControlDelegate

- (IBAction)buttonClicked:(id)sender
{
	buttonClicked(self->gocontrol);
}

- (IBAction)checkboxToggled:(id)sender
{
	checkboxToggled(self->gocontrol);
}

- (void)controlTextDidChange:(NSNotification *)note
{
	textfieldChanged(self->gocontrol);
}

@end

id newButton(void)
{
	NSButton *b;

	b = [[NSButton alloc] initWithFrame:NSZeroRect];
	[b setButtonType:NSMomentaryPushInButton];
	[b setBordered:YES];
	[b setBezelStyle:NSRoundedBezelStyle];
	setStandardControlFont((id) b);
	return (id) b;
}

void buttonSetDelegate(id button, void *b)
{
	goControlDelegate *d;

	d = [goControlDelegate new];
	d->gocontrol = b;
	[toNSButton(button) setTarget:d];
	[toNSButton(button) setAction:@selector(buttonClicked:)];
}

const char *buttonText(id button)
{
	return [[toNSButton(button) title] UTF8String];
}

void buttonSetText(id button, char *text)
{
	[toNSButton(button) setTitle:[NSString stringWithUTF8String:text]];
}

id newCheckbox(void)
{
	NSButton *c;

	c = [[NSButton alloc] initWithFrame:NSZeroRect];
	[c setButtonType:NSSwitchButton];
	[c setBordered:NO];
	setStandardControlFont((id) c);
	return (id) c;
}

void checkboxSetDelegate(id checkbox, void *b)
{
	goControlDelegate *d;

	d = [goControlDelegate new];
	d->gocontrol = b;
	[toNSButton(checkbox) setTarget:d];
	[toNSButton(checkbox) setAction:@selector(checkboxToggled:)];
}

BOOL checkboxChecked(id c)
{
	if ([toNSButton(c) state] == NSOnState)
		return YES;
	return NO;
}

void checkboxSetChecked(id c, BOOL checked)
{
	NSInteger state;

	state = NSOnState;
	if (checked == NO)
		state = NSOffState;
	[toNSButton(c) setState:state];
}

// also good for labels
static id finishNewTextField(NSTextField *t, BOOL bordered)
{
	// same for text fields, password fields, and labels
	setStandardControlFont((id) t);
	// these three are the same across text fields, password fields, and labels; the only difference is the setBezeled: value, and it's only different on labels
	// THE ORDER OF THESE CALLS IS IMPORTANT; CHANGE IT AND THE BORDERS WILL DISAPPEAR
	[t setBordered:NO];
	[t setBezelStyle:NSTextFieldSquareBezel];
	[t setBezeled:bordered];
	// smart quotes and other autocorrect features are handled by the window; see newWindow() in window_darwin.m for details
	// Interface Builder does this to make the text box behave properly
	// this disables both word wrap AND ellipsizing in one fell swoop
	// however, we need to send it to the control's cell, not to the control directly
	[[t cell] setLineBreakMode:NSLineBreakByClipping];
	// Interface Builder also sets this to allow horizontal scrolling
	// it also sets this for labels, despite those not being scrollable
	[[t cell] setScrollable:YES];
	return (id) t;
}

id newTextField(void)
{
	NSTextField *t;

	t = [[NSTextField alloc] initWithFrame:NSZeroRect];
	return finishNewTextField(t, YES);
}

id newPasswordField(void)
{
	NSSecureTextField *t;

	t = [[NSSecureTextField alloc] initWithFrame:NSZeroRect];
	return finishNewTextField(toNSTextField(t), YES);
}

void textfieldSetDelegate(id textfield, void *t)
{
	goControlDelegate *d;

	d = [goControlDelegate new];
	d->gocontrol = t;
	[toNSTextField(textfield) setDelegate:d];
}

// also good for labels
const char *textFieldText(id t)
{
	return [[toNSTextField(t) stringValue] UTF8String];
}

// also good for labels
void textFieldSetText(id t, char *text)
{
	[toNSTextField(t) setStringValue:[NSString stringWithUTF8String:text]];
}

id textfieldOpenInvalidPopover(id textfield, char *reason)
{
	// step 1: set up the display
	NSTextField *label;
	NSTextAttachmentCell *cell;
	NSTextAttachment *attachment;
	NSAttributedString *strImage;
	NSAttributedString *strText;
	NSFont *font;
	NSMutableAttributedString *str;

	// method thanks to Anne in http://stackoverflow.com/a/5303517/3408572
	// TODO improve appearance
	label = toNSTextField(newLabel());
	cell = [[NSTextAttachmentCell alloc] initImageCell:[NSImage imageNamed:NSImageNameCaution]];
	attachment = [NSTextAttachment new];
	[attachment setAttachmentCell:cell];
	strImage = [NSAttributedString attributedStringWithAttachment:attachment];
	font = [NSFont systemFontOfSize:[NSFont systemFontSizeForControlSize:NSRegularControlSize]];
	strText = [[NSAttributedString alloc] initWithString:[NSString stringWithUTF8String:reason] attributes:[[font fontDescriptor] fontAttributes]];
	str = [[NSMutableAttributedString alloc] initWithAttributedString:strImage];
	[str appendAttributedString:strText];
	[label setAttributedStringValue:str];

	// step 2: set up the popover
	NSPopover *popover;
	NSViewController *vc;

	vc = [NSViewController new];
	[vc setView:label];
	popover = [NSPopover new];
	[popover setContentViewController:vc];
	[label sizeToFit];
	[popover setContentSize:[label frame].size];

	// step 3: show the popover
	// NSMaxYEdge is the bottom edge when looking (maximum edge in window coordinates)
	[popover showRelativeToRect:NSZeroRect ofView:toNSView(textfield) preferredEdge:NSMaxYEdge];

	return (id) popover;
}

void textfieldCloseInvalidPopover(id popover)
{
	[toNSPopover(popover) close];
	[toNSPopover(popover) release];
}

id newLabel(void)
{
	NSTextField *l;

	l = [[NSTextField alloc] initWithFrame:NSZeroRect];
	[l setEditable:NO];
	[l setSelectable:NO];
	[l setDrawsBackground:NO];
	return finishNewTextField(l, NO);
}

id newGroup(id container)
{
	NSBox *group;

	group = [[NSBox alloc] initWithFrame:NSZeroRect];
	[group setBorderType:NSLineBorder];
	[group setBoxType:NSBoxPrimary];
	[group setTransparent:NO];
	// can't use setSmallControlFont() here because the selector is different
	[group setTitleFont:[NSFont systemFontOfSize:[NSFont systemFontSizeForControlSize:NSSmallControlSize]]];
	[group setTitlePosition:NSAtTop];
	[group setContentView:toNSView(container)];
	return (id) group;
}

const char *groupText(id group)
{
	return [[toNSBox(group) title] UTF8String];
}

void groupSetText(id group, char *text)
{
	[toNSBox(group) setTitle:[NSString stringWithUTF8String:text]];
}