//go:build darwin

package application

/*
#cgo CFLAGS: -x objective-c
#cgo LDFLAGS: -framework Foundation -framework Cocoa -framework WebKit -framework AppKit
#import <Foundation/Foundation.h>
#import <CoreGraphics/CoreGraphics.h>
#import <Cocoa/Cocoa.h>
#import <AppKit/AppKit.h>
#include <stdlib.h>

typedef struct Screen {
	const char* id;
	const char* name;
	int p_width;
	int p_height;
	int width;
	int height;
	int x;
	int y;
	int w_width;
	int w_height;
	int w_x;
	int w_y;
	float scale;
	double rotation;
	bool isPrimary;
} Screen;


int GetNumScreens(){
	return [[NSScreen screens] count];
}

Screen processScreen(NSScreen* screen){
	Screen returnScreen;
	returnScreen.scale = screen.backingScaleFactor;

	// screen bounds
	returnScreen.height = screen.frame.size.height;
	returnScreen.width = screen.frame.size.width;
	returnScreen.x = screen.frame.origin.x;
	returnScreen.y = screen.frame.origin.y;

	// work area
	NSRect workArea = [screen visibleFrame];
	returnScreen.w_height = workArea.size.height;
	returnScreen.w_width = workArea.size.width;
	returnScreen.w_x = workArea.origin.x;
	returnScreen.w_y = workArea.origin.y;


	// adapted from https://stackoverflow.com/a/1237490/4188138
	NSDictionary* screenDictionary = [screen deviceDescription];
	NSNumber* screenID = [screenDictionary objectForKey:@"NSScreenNumber"];
	CGDirectDisplayID displayID = [screenID unsignedIntValue];
	returnScreen.id = [[NSString stringWithFormat:@"%d", displayID] UTF8String];

	// Get physical monitor size
	NSValue *sizeValue = [screenDictionary objectForKey:@"NSDeviceSize"];
	NSSize physicalSize = sizeValue.sizeValue;
	returnScreen.p_height = physicalSize.height;
	returnScreen.p_width = physicalSize.width;

	// Get the rotation
	double rotation = CGDisplayRotation(displayID);
	returnScreen.rotation = rotation;

	if( @available(macOS 10.15, *) ){
		returnScreen.name = [screen.localizedName UTF8String];
	}

	return returnScreen;
}

// Get primary screen
Screen GetPrimaryScreen(){
	// Get primary screen
	NSScreen *mainScreen = [NSScreen mainScreen];
	return processScreen(mainScreen);
}

Screen* getAllScreens() {
	NSArray<NSScreen *> *screens = [NSScreen screens];
	Screen* returnScreens = malloc(sizeof(Screen) * screens.count);
	for (int i = 0; i < screens.count; i++) {
		NSScreen* screen = [screens objectAtIndex:i];
		returnScreens[i] = processScreen(screen);
	}
	return returnScreens;
}

Screen getScreenForWindow(void* window){
	NSScreen* screen = ((NSWindow*)window).screen;
	return processScreen(screen);
}

*/
import "C"
import "unsafe"

func cScreenToScreen(screen C.Screen) *Screen {

	return &Screen{
		Size: Size{
			Width:  int(screen.p_width),
			Height: int(screen.p_height),
		},
		Bounds: Rect{
			X:      int(screen.x),
			Y:      int(screen.y),
			Height: int(screen.height),
			Width:  int(screen.width),
		},
		WorkArea: Rect{
			X:      int(screen.w_x),
			Y:      int(screen.w_y),
			Height: int(screen.w_height),
			Width:  int(screen.w_width),
		},
		Scale:     float32(screen.scale),
		ID:        C.GoString(screen.id),
		Name:      C.GoString(screen.name),
		IsPrimary: bool(screen.isPrimary),
		Rotation:  float32(screen.rotation),
	}
}

func getPrimaryScreen() (*Screen, error) {
	cScreen := C.GetPrimaryScreen()
	return cScreenToScreen(cScreen), nil
}

func getScreens() ([]*Screen, error) {
	cScreens := C.getAllScreens()
	defer C.free(unsafe.Pointer(cScreens))
	numScreens := int(C.GetNumScreens())
	displays := make([]*Screen, numScreens)
	cScreenHeaders := (*[1 << 30]C.Screen)(unsafe.Pointer(cScreens))[:numScreens:numScreens]
	for i := 0; i < numScreens; i++ {
		displays[i] = cScreenToScreen(cScreenHeaders[i])
	}
	return displays, nil
}

func getScreenForWindow(window *macosWebviewWindow) (*Screen, error) {
	cScreen := C.getScreenForWindow(window.nsWindow)
	return cScreenToScreen(cScreen), nil
}