Isolate window methods

Define create window prototype in header.

src/main.h

@@ -1,16 +1,33 @@
-//
-//  main.h
-//  cerberus
-//
-//  Created by Allan Crisostomo on 2023-01-06.
-//
-
-#ifndef main_h
-#define main_h
+#ifndef MAIN_H
+#define MAIN_H
 
 #define WINDOW_X 0
 #define WINDOW_Y 0
 #define WINDOW_WIDTH 350
 #define WINDOW_HEIGHT 250
 
-#endif /* main_h */
+typedef enum {
+    CBR_WINDOW_STYLE_FLAG_BORDERLESS = 0,
+    CBR_WINDOW_STYLE_FLAG_TITLED = 1 << 0,
+    CBR_WINDOW_STYLE_FLAG_CLOSABLE = 1 << 1,
+    CBR_WINDOW_STYLE_FLAG_MINIATURIZABLE = 1 << 2,
+    CBR_WINDOW_STYLE_FLAG_RESIZABLE = 1 << 3,
+    CBR_WINDOW_STYLE_FLAG_FULL_SCREEN = 1 << 14,
+} CBR_WindowStyleFlag;
+
+typedef struct {
+    float x;
+    float y;
+    float width;
+    float height;
+} CBR_Rect;
+
+typedef struct {
+    CBR_Rect rect;
+    CBR_WindowStyleFlag style_flags;
+    const char* title;
+} CBR_CreateWindowParams;
+
+void* CBR_CreateWindow(CBR_CreateWindowParams);
+
+#endif

src/main.m

@@ -1,15 +1,34 @@
 #import <Cocoa/Cocoa.h>
+#import "main.h"
+
+void* CBR_CreateWindow(CBR_CreateWindowParams params) {
+    id window = [
+        [NSWindow alloc] initWithContentRect:NSMakeRect(params.rect.x, params.rect.y, params.rect.width, params.rect.height)
+        styleMask: (NSWindowStyleMask)params.style_flags
+        backing:NSBackingStoreBuffered
+        defer:NO
+    ];
+    [window cascadeTopLeftFromPoint:NSMakePoint(0,0)];
+    [window setTitle: [NSString stringWithUTF8String:(params.title)]];
+    [window makeKeyAndOrderFront:nil];
+    return (__bridge void *)(window);
+}
 
 int main() {
 	@autoreleasepool{
 		[NSApplication sharedApplication];
 		[NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];
 		id applicationName = [[NSProcessInfo processInfo] processName];
-		id window = [[NSWindow alloc] initWithContentRect:NSMakeRect(0, 0, 120, 120)
-																						styleMask:NSWindowStyleMaskTitled backing:NSBackingStoreBuffered defer:NO];
-		[window cascadeTopLeftFromPoint:NSMakePoint(20,20)];
-		[window setTitle: applicationName];
-		[window makeKeyAndOrderFront:nil];
+        void* window = CBR_CreateWindow((CBR_CreateWindowParams) {
+            .rect = {
+                .x = WINDOW_X,
+                .y = WINDOW_Y,
+                .width = WINDOW_WIDTH,
+                .height = WINDOW_HEIGHT
+            },
+            .style_flags = CBR_WINDOW_STYLE_FLAG_TITLED,
+            .title = [applicationName cStringUsingEncoding:NSUTF8StringEncoding]
+        });
 		[NSApp activateIgnoringOtherApps:YES];
 		[NSApp run];
 	}