/**
 * Copyright (c) 2015-present, Horcrux.
 * All rights reserved.
 *
 * This source code is licensed under the MIT-style license found in the
 * LICENSE file in the root directory of this source tree.
 */

#import "RNSVGNode.h"
#import "RNSVGClipPath.h"
#import "RNSVGContainer.h"
#import "RNSVGGlyphContext.h"
#import "RNSVGGroup.h"

@interface RNSVGNode ()
@property (nonatomic, readwrite, weak) RNSVGSvgView *svgView;
@property (nonatomic, readwrite, weak) RNSVGGroup *textRoot;
@end

@implementation RNSVGNode {
  RNSVGGlyphContext *glyphContext;
  BOOL _transparent;
  RNSVGClipPath *_clipNode;
  CGPathRef _cachedClipPath;
  CGFloat canvasWidth;
  CGFloat canvasHeight;
  CGFloat canvasDiagonal;
}

CGFloat const RNSVG_M_SQRT1_2l = (CGFloat)0.707106781186547524400844362104849039;
CGFloat const RNSVG_DEFAULT_FONT_SIZE = 12;

- (instancetype)init
{
  if (self = [super init]) {
    self.opacity = 1;
    self.opaque = false;
    self.matrix = CGAffineTransformIdentity;
    self.transforms = CGAffineTransformIdentity;
    self.invTransform = CGAffineTransformIdentity;
    _merging = false;
    _dirty = false;
  }
  return self;
}

- (void)insertReactSubview:(RNSVGView *)subview atIndex:(NSInteger)atIndex
{
  [super insertReactSubview:subview atIndex:atIndex];
  [self insertSubview:subview atIndex:atIndex];
  [self invalidate];
}

- (void)removeReactSubview:(RNSVGView *)subview
{
  [super removeReactSubview:subview];
  [self invalidate];
}

- (void)didUpdateReactSubviews
{
  // Do nothing, as subviews are inserted by insertReactSubview:
}

- (void)invalidate
{
  if (_dirty || _merging) {
    return;
  }
  _dirty = true;
  RNSVGView *container = self.superview;
  // on Fabric, when the child components are added to hierarchy and their props are set,
  // their superview is not set yet.
  if ([container conformsToProtocol:@protocol(RNSVGContainer)]) {
    [(id<RNSVGContainer>)container invalidate];
  }
  [self clearPath];
  canvasWidth = -1;
  canvasHeight = -1;
  canvasDiagonal = -1;
}

- (void)clearPath
{
  CGPathRelease(_path);
  self.path = nil;
}

- (void)clearChildCache
{
  [self clearPath];
  for (__kindof RNSVGNode *node in self.subviews) {
    if ([node isKindOfClass:[RNSVGNode class]]) {
      [node clearChildCache];
    }
  }
}

- (void)clearParentCache
{
  RNSVGNode *node = self;
  while (node != nil) {
    RNSVGPlatformView *parent = [node superview];

    if (![parent isKindOfClass:[RNSVGNode class]]) {
      return;
    }
    node = (RNSVGNode *)parent;
    if (!node.path) {
      return;
    }
    [node clearPath];
  }
}

- (RNSVGGroup *)textRoot
{
  if (_textRoot) {
    return _textRoot;
  }

  RNSVGNode *node = self;
  while (node != nil) {
    if ([node isKindOfClass:[RNSVGGroup class]] && [((RNSVGGroup *)node) getGlyphContext] != nil) {
      _textRoot = (RNSVGGroup *)node;
      break;
    }

    RNSVGPlatformView *parent = [node superview];

    if (![node isKindOfClass:[RNSVGNode class]]) {
      node = nil;
    } else {
      node = (RNSVGNode *)parent;
    }
  }

  return _textRoot;
}

- (RNSVGGroup *)getParentTextRoot
{
  RNSVGNode *parent = (RNSVGGroup *)[self superview];
  if (![parent isKindOfClass:[RNSVGGroup class]]) {
    return nil;
  } else {
    return parent.textRoot;
  }
}

- (CGFloat)getFontSizeFromContext
{
  RNSVGGroup *root = self.textRoot;
  if (root == nil) {
    return RNSVG_DEFAULT_FONT_SIZE;
  }

  if (glyphContext == nil) {
    glyphContext = [root getGlyphContext];
  }

  return [glyphContext getFontSize];
}

- (void)reactSetInheritedBackgroundColor:(RNSVGColor *)inheritedBackgroundColor
{
  self.backgroundColor = inheritedBackgroundColor;
}

- (void)setPointerEvents:(RCTPointerEvents)pointerEvents
{
  _pointerEvents = pointerEvents;
  self.userInteractionEnabled = (pointerEvents != RCTPointerEventsNone);
  if (pointerEvents == RCTPointerEventsBoxNone) {
#if TARGET_OS_OSX
    self.accessibilityModal = NO;
#else
    self.accessibilityViewIsModal = NO;
#endif // TARGET_OS_OSX
  }
}

- (void)setName:(NSString *)name
{
  if ([name isEqualToString:_name]) {
    return;
  }

  [self invalidate];
  _name = name;
}

- (void)setDisplay:(NSString *)display
{
  if ([display isEqualToString:_display]) {
    return;
  }

  [self invalidate];
  _display = display;
}

- (void)setOpacity:(CGFloat)opacity
{
  if (opacity == _opacity) {
    return;
  }

  if (opacity <= 0) {
    opacity = 0;
  } else if (opacity > 1) {
    opacity = 1;
  }

  [self invalidate];
  _transparent = opacity < 1;
  _opacity = opacity;
}

- (void)setMatrix:(CGAffineTransform)matrix
{
  if (CGAffineTransformEqualToTransform(matrix, _matrix)) {
    return;
  }
  _matrix = matrix;
  _invmatrix = CGAffineTransformInvert(matrix);
  RNSVGView *container = self.superview;
  // on Fabric, when the child components are added to hierarchy and their props are set,
  // their superview is still their componentView, we change it in `mountChildComponentView` method.
  if ([container conformsToProtocol:@protocol(RNSVGContainer)]) {
    [(id<RNSVGContainer>)container invalidate];
  }
}

- (void)setClientRect:(CGRect)clientRect
{
  if (CGRectEqualToRect(_clientRect, clientRect)) {
    return;
  }
  _clientRect = clientRect;
  if (self.onLayout) {
    self.onLayout(@{
      @"layout" : @{
        @"x" : @(_clientRect.origin.x),
        @"y" : @(_clientRect.origin.y),
        @"width" : @(_clientRect.size.width),
        @"height" : @(_clientRect.size.height),
      }
    });
  }
}

- (void)setClipPath:(NSString *)clipPath
{
  if ([_clipPath isEqualToString:clipPath]) {
    return;
  }
  CGPathRelease(_cachedClipPath);
  _cachedClipPath = nil;
  _clipPath = clipPath;
  [self invalidate];
}

- (void)setClipRule:(RNSVGCGFCRule)clipRule
{
  if (_clipRule == clipRule) {
    return;
  }
  CGPathRelease(_cachedClipPath);
  _cachedClipPath = nil;
  _clipRule = clipRule;
  [self invalidate];
}

- (void)setMask:(NSString *)mask
{
  if ([_mask isEqualToString:mask]) {
    return;
  }
  _mask = mask;
  [self invalidate];
}

- (void)setMarkerStart:(NSString *)markerStart
{
  if ([_markerStart isEqualToString:markerStart]) {
    return;
  }
  _markerStart = markerStart;
  [self invalidate];
}

- (void)setMarkerMid:(NSString *)markerMid
{
  if ([_markerMid isEqualToString:markerMid]) {
    return;
  }
  _markerMid = markerMid;
  [self invalidate];
}

- (void)setMarkerEnd:(NSString *)markerEnd
{
  if ([_markerEnd isEqualToString:markerEnd]) {
    return;
  }
  _markerEnd = markerEnd;
  [self invalidate];
}

- (void)beginTransparencyLayer:(CGContextRef)context
{
  if (_transparent) {
    CGContextBeginTransparencyLayer(context, NULL);
  }
}

- (void)endTransparencyLayer:(CGContextRef)context
{
  if (_transparent) {
    CGContextEndTransparencyLayer(context);
  }
}

- (void)renderTo:(CGContextRef)context rect:(CGRect)rect
{
  self.dirty = false;
  // abstract
}

- (CGPathRef)getClipPath
{
  return _cachedClipPath;
}

- (CGPathRef)getClipPath:(CGContextRef)context
{
  if (self.clipPath) {
    _clipNode = (RNSVGClipPath *)[self.svgView getDefinedClipPath:self.clipPath];
    if (_cachedClipPath) {
      CGPathRelease(_cachedClipPath);
    }
    CGAffineTransform transform = CGAffineTransformConcat(_clipNode.matrix, _clipNode.transforms);
    _cachedClipPath = CGPathCreateCopyByTransformingPath([_clipNode getPath:context], &transform);
  }

  return _cachedClipPath;
}

- (void)clip:(CGContextRef)context
{
  CGPathRef clipPath = [self getClipPath:context];

  if (clipPath) {
    CGContextAddPath(context, clipPath);
    if (_clipRule == kRNSVGCGFCRuleEvenodd) {
      CGContextEOClip(context);
    } else {
      CGContextClip(context);
    }
  }
}

- (CGPathRef)getPath:(CGContextRef)context
{
  // abstract
  return nil;
}

- (void)renderLayerTo:(CGContextRef)context rect:(CGRect)rect
{
  // abstract
}

// hitTest delagate
- (RNSVGPlatformView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
  // abstract
  return nil;
}

- (RNSVGSvgView *)svgView
{
  if (_svgView) {
    return _svgView;
  }

  __kindof RNSVGPlatformView *parent = self.superview;

  if ([parent class] == [RNSVGSvgView class]) {
    _svgView = parent;
  } else if ([parent isKindOfClass:[RNSVGNode class]]) {
    _svgView = ((RNSVGNode *)parent).svgView;
  } else {
    RCTLogError(@"RNSVG: %@ should be descendant of a SvgViewShadow.", NSStringFromClass(self.class));
  }

  return _svgView;
}

- (CGFloat)relativeOnWidthString:(NSString *)length
{
  return [RNSVGPropHelper fromRelativeWithNSString:length
                                          relative:[self getCanvasWidth]
                                          fontSize:[self getFontSizeFromContext]];
}

- (CGFloat)relativeOnHeightString:(NSString *)length
{
  return [RNSVGPropHelper fromRelativeWithNSString:length
                                          relative:[self getCanvasHeight]
                                          fontSize:[self getFontSizeFromContext]];
}

- (CGFloat)relativeOnOtherString:(NSString *)length
{
  return [RNSVGPropHelper fromRelativeWithNSString:length
                                          relative:[self getCanvasDiagonal]
                                          fontSize:[self getFontSizeFromContext]];
}

- (CGFloat)relativeOn:(RNSVGLength *)length relative:(CGFloat)relative
{
  RNSVGLengthUnitType unit = length.unit;
  if (unit == SVG_LENGTHTYPE_NUMBER) {
    return length.value;
  } else if (unit == SVG_LENGTHTYPE_PERCENTAGE) {
    return length.value / 100 * relative;
  }
  return [self fromRelative:length];
}

- (CGFloat)relativeOnWidth:(RNSVGLength *)length
{
  RNSVGLengthUnitType unit = length.unit;
  if (unit == SVG_LENGTHTYPE_NUMBER) {
    return length.value;
  } else if (unit == SVG_LENGTHTYPE_PERCENTAGE) {
    return length.value / 100 * [self getCanvasWidth];
  }
  return [self fromRelative:length];
}

- (CGFloat)relativeOnHeight:(RNSVGLength *)length
{
  RNSVGLengthUnitType unit = length.unit;
  if (unit == SVG_LENGTHTYPE_NUMBER) {
    return length.value;
  } else if (unit == SVG_LENGTHTYPE_PERCENTAGE) {
    return length.value / 100 * [self getCanvasHeight];
  }
  return [self fromRelative:length];
}

- (CGFloat)relativeOnOther:(RNSVGLength *)length
{
  RNSVGLengthUnitType unit = length.unit;
  if (unit == SVG_LENGTHTYPE_NUMBER) {
    return length.value;
  } else if (unit == SVG_LENGTHTYPE_PERCENTAGE) {
    return length.value / 100 * [self getCanvasDiagonal];
  }
  return [self fromRelative:length];
}

- (CGFloat)fromRelative:(RNSVGLength *)length
{
  CGFloat unit;
  switch (length.unit) {
    case SVG_LENGTHTYPE_EMS:
      unit = [self getFontSizeFromContext];
      break;
    case SVG_LENGTHTYPE_EXS:
      unit = [self getFontSizeFromContext] / 2;
      break;

    case SVG_LENGTHTYPE_CM:
      unit = (CGFloat)35.43307;
      break;
    case SVG_LENGTHTYPE_MM:
      unit = (CGFloat)3.543307;
      break;
    case SVG_LENGTHTYPE_IN:
      unit = 90;
      break;
    case SVG_LENGTHTYPE_PT:
      unit = 1.25;
      break;
    case SVG_LENGTHTYPE_PC:
      unit = 15;
      break;

    default:
      unit = 1;
  }
  return length.value * unit;
}

- (CGRect)getContextBounds
{
  return CGContextGetClipBoundingBox(UIGraphicsGetCurrentContext());
}

- (CGFloat)getContextWidth
{
  return CGRectGetWidth([self getContextBounds]);
}

- (CGFloat)getContextHeight
{
  return CGRectGetHeight([self getContextBounds]);
}

- (CGFloat)getContextDiagonal
{
  CGRect bounds = [self getContextBounds];
  CGFloat width = CGRectGetWidth(bounds);
  CGFloat height = CGRectGetHeight(bounds);
  CGFloat powX = width * width;
  CGFloat powY = height * height;
  CGFloat r = sqrt(powX + powY) * RNSVG_M_SQRT1_2l;
  return r;
}

- (CGFloat)getCanvasWidth
{
  if (canvasWidth != -1) {
    return canvasWidth;
  }
  RNSVGGroup *root = [self textRoot];
  if (root == nil) {
    canvasWidth = [self getContextWidth];
  } else {
    canvasWidth = [[root getGlyphContext] getWidth];
  }

  return canvasWidth;
}

- (CGFloat)getCanvasHeight
{
  if (canvasHeight != -1) {
    return canvasHeight;
  }
  RNSVGGroup *root = [self textRoot];
  if (root == nil) {
    canvasHeight = [self getContextHeight];
  } else {
    canvasHeight = [[root getGlyphContext] getHeight];
  }

  return canvasHeight;
}

- (CGFloat)getCanvasDiagonal
{
  if (canvasDiagonal != -1) {
    return canvasDiagonal;
  }
  CGFloat width = [self getCanvasWidth];
  CGFloat height = [self getCanvasHeight];
  CGFloat powX = width * width;
  CGFloat powY = height * height;
  canvasDiagonal = sqrt(powX + powY) * RNSVG_M_SQRT1_2l;
  return canvasDiagonal;
}

- (void)parseReference
{
  self.dirty = false;
  if (self.name) {
    __typeof__(self) __weak weakSelf = self;
    [self.svgView defineTemplate:weakSelf templateName:self.name];
  }
}

- (void)traverseSubviews:(BOOL (^)(__kindof RNSVGView *node))block
{
  for (RNSVGView *node in self.subviews) {
    if (!block(node)) {
      break;
    }
  }
}

- (void)dealloc
{
  CGPathRelease(_cachedClipPath);
  CGPathRelease(_strokePath);
  CGPathRelease(_path);
}

#ifdef RN_FABRIC_ENABLED
- (void)prepareForRecycle
{
  [super prepareForRecycle];

  self.opacity = 1;
  self.opaque = false;
  self.matrix = CGAffineTransformIdentity;
  self.transforms = CGAffineTransformIdentity;
  self.invTransform = CGAffineTransformIdentity;
  _merging = false;
  _dirty = false;

  _name = nil;
  _display = nil;
  _opacity = 0;
  _clipRule = kRNSVGCGFCRuleEvenodd;
  _clipPath = nil;
  _mask = nil;
  _markerStart = nil;
  _markerMid = nil;
  _markerEnd = nil;
  _parentComponentView = nil;

  _pointerEvents = RCTPointerEventsUnspecified;
  _responsible = NO;

  _ctm = CGAffineTransformIdentity;
  _screenCTM = CGAffineTransformIdentity;
  _matrix = CGAffineTransformIdentity;
  _transforms = CGAffineTransformIdentity;
  _invmatrix = CGAffineTransformIdentity;
  _invTransform = CGAffineTransformIdentity;
  _active = NO;
  _skip = NO;
  if (_markerPath) {
    CGPathRelease(_markerPath);
  }
  _markerPath = nil;
  _clientRect = CGRectZero;
  _pathBounds = CGRectZero;
  _fillBounds = CGRectZero;
  _strokeBounds = CGRectZero;
  _markerBounds = CGRectZero;
  _onLayout = nil;

  _svgView = nil;
  _textRoot = nil;

  glyphContext = nil;
  _transparent = NO;
  _clipNode = nil;
  canvasWidth = 0;
  canvasHeight = 0;
  canvasDiagonal = 0;
  CGPathRelease(_cachedClipPath);
  _cachedClipPath = nil;
  CGPathRelease(_strokePath);
  _strokePath = nil;
  CGPathRelease(_path);
  _path = nil;
}
#endif // RN_FABRIC_ENABLED

@end