//
//  GameScene.m
//  danmaku
//
//  Created by Sam Jaffe on 5/22/19.
//  Copyright © 2019 Sam Jaffe. All rights reserved.
//

#import "GameScene.h"

#include <OpenGL/gl3.h>

#include "game/engine/events.hpp"
#include "GameAdaptor.h"

@implementation GameScene

- (id)initWithFrame:(NSRect)aRect {
  NSOpenGLPixelFormatAttribute attr[] = {
    NSOpenGLPFADoubleBuffer,
    0
  };
  
  // create pixel format
  NSOpenGLPixelFormat *nsglFormat = [[NSOpenGLPixelFormat alloc] initWithAttributes:attr];
  
  // create the context...
  if (!(self = [super initWithFrame:aRect pixelFormat:nsglFormat])) {
    return nil;
  }
  
  // make the context current
  [[self openGLContext] makeCurrentContext];
  
  // rest of your init method ...
  return self;
}

- (void)prepareOpenGL {
  init_gl();
  // enable vertical sychronization to refresh rate
  const GLint vals = 0x01;
  [[self openGLContext] setValues:&vals forParameter:NSOpenGLCPSwapInterval];
  
  const GLint opaque = 0;
  [[self openGLContext] setValues:&opaque forParameter:NSOpenGLCPSurfaceOpacity];
}

- (void)drawRect:(NSRect)dirtyRect {
  //  glClear(GL_COLOR_BUFFER_BIT);
  //  glLoadIdentity();
  
  screen_resize((int)dirtyRect.size.width, (int)dirtyRect.size.height);
  draw_screen();
  //  glFlush();
  // the correct way to do double buffering on Mac is this:
  [[self openGLContext] flushBuffer];
  
  int err;
  if ((err = glGetError()) != 0)
    NSLog(@"glGetError(): %d", err);
    }

- (void)reshape {
  NSRect newFrame = {0, 0, [[self window] frame].size.width, [[self window] frame].size.height};
  [self setFrame:newFrame];
  
  // window resize; width and height are in pixel coordinates
  // but they are floats
  float screen_w = [self frame].size.width;
  float screen_h = [self frame].size.height;
  
  //  glViewport(0,0, screen_w, screen_h);
  
  // here I cast floats to ints; most systems use integer coordinate systems
  screen_resize((int)screen_w, (int)screen_h);
}

- (BOOL)acceptsFirstResponder {
  return YES;
}

void bind_key_up(NSEvent * evt, int ns_key, int key) {
  if ([evt keyCode] == ns_key) { key_up(key); }
}

void bind_key_down(NSEvent * evt, int ns_key, int key) {
  if ([evt keyCode] == ns_key) { key_down(key); }
}

void bind_key_toggle(NSEvent * evt, int ns_key, int key) {
  NSUInteger flags = [evt modifierFlags] &
      NSEventModifierFlagDeviceIndependentFlagsMask;
  if (flags & ns_key) {
    key_down(key);
  } else {
    key_up(key);
  }
}

- (void)keyDown:(NSEvent *)theEvent {
  if ([theEvent isARepeat])
    return;
  
  NSString *str = [theEvent charactersIgnoringModifiers];
  unichar c = [str characterAtIndex:0];
  
  // only ASCII please
  if (c < ' ' || c > '~') {
    c = 0;
  }
    
  //(unsigned long)[theEvent modifierFlags]
  using namespace engine::keys;
  bind_key_toggle(theEvent, NSEventModifierFlagShift, MOD_SHIFT);
  bind_key_toggle(theEvent, NSEventModifierFlagControl, MOD_CONTROL);
  bind_key_toggle(theEvent, NSEventModifierFlagOption, MOD_ALT);
  bind_key_toggle(theEvent, NSEventModifierFlagCommand, MOD_COMMAND);
  bind_key_down(theEvent, 0x007e, UP_ARROW);
  bind_key_down(theEvent, 0x007d, DOWN_ARROW);
  bind_key_down(theEvent, 0x007b, LEFT_ARROW);
  bind_key_down(theEvent, 0x007c, RIGHT_ARROW);
  
  //  NSLog(@"keyDown -> { 0x%04x, 0x%08lx, 0x%02x=%c }", [theEvent keyCode], [theEvent modifierFlags], c, c);
  key_down(c);
}

- (void)keyUp:(NSEvent *)theEvent {
  //  NSLog(@"keyUp -> { 0x%04x, 0x%08lx }", [theEvent keyCode], [theEvent modifierFlags]);
  NSString *str = [theEvent charactersIgnoringModifiers];
  unichar c = [str characterAtIndex:0];
  
  // only ASCII please
  if (c < ' ' || c > '~') {
    c = 0;
  }
  
  using namespace engine::keys;
  bind_key_up(theEvent, 0x007e, UP_ARROW);
  bind_key_up(theEvent, 0x007d, DOWN_ARROW);
  bind_key_up(theEvent, 0x007b, LEFT_ARROW);
  bind_key_up(theEvent, 0x007c, RIGHT_ARROW);
  
  key_up(c);
}

static NSTimer *timer = nil;
static NSTimer *frameTimer = nil;
static NSTimeInterval const FRAME_INTERVAL = 1.0 / 60.0;

- (void)windowDidResignMain:(NSNotification *)notification {
  NSLog(@"window did resign main");
  [timer invalidate];
  [frameTimer invalidate];
  
  game_deactivate();      // freeze, pause
  [self setNeedsDisplay:YES];
}

- (void)windowDidBecomeMain:(NSNotification *)notification {
  NSLog(@"window did become main");
  
  game_activate();
  [self setNeedsDisplay:YES];
  
  timer = [NSTimer timerWithTimeInterval:FRAME_INTERVAL
                                  target:self
                                selector:@selector(timerEvent:)
                                userInfo:nil
                                 repeats:YES];
  
  frameTimer = [NSTimer timerWithTimeInterval:FRAME_INTERVAL
                                       target:self
                                     selector:@selector(renderEvent:)
                                     userInfo:nil
                                      repeats:YES];
  
  
  [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
  [[NSRunLoop currentRunLoop] addTimer:frameTimer forMode:NSDefaultRunLoopMode];
}

- (void)renderEvent:(NSTimer *)t {
  draw_screen(); // FIXME
  [[self openGLContext] flushBuffer];
}

- (void)timerEvent:(NSTimer *)t {
  run_game();
  [self setNeedsDisplay:YES];
}

- (void) awakeFromNib
{
  NSOpenGLPixelFormatAttribute attributes [] = {
    NSOpenGLPFADepthSize, (NSOpenGLPixelFormatAttribute)24,
    NSOpenGLPFAOpenGLProfile, NSOpenGLProfileVersion3_2Core,
    (NSOpenGLPixelFormatAttribute)0
  };
  
  NSOpenGLPixelFormat *pf = [[NSOpenGLPixelFormat alloc] initWithAttributes:attributes];
  [self setPixelFormat:pf];
}

@end