/*
  Copyright (c) 2007, Marcus Müller <znek@mulle-kybernetik.com>.
  All rights reserved.


  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:

  - Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.

  - Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

  - Neither the name of Mulle kybernetiK nor the names of its contributors
  may be used to endorse or promote products derived from this software
  without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  POSSIBILITY OF SUCH DAMAGE.
*/

#include "common.h"
#include "RendererChain.h"

@implementation QCRenderer (QuartzCViewConvenience)

- (NSString *)inputImageKey {
  return [self keyFromSet:[self inputKeys] ofType:QCPortTypeImage];
}

- (NSString *)outputImageKey {
  return [self keyFromSet:[self outputKeys] ofType:QCPortTypeImage];
}

- (NSString *)shouldFlipKey {
  return [self keyFromSet:[self inputKeys] ofType:QCPortTypeBoolean];
}

- (NSString *)keyFromSet:(NSArray *)_names ofType:(NSString *)_type {
  NSDictionary *attrs;
  unsigned     i, count;
  NSString     *alt1Type;
  NSString     *alt2Type;

  attrs = [self attributes];
  for (i = 0, count = [_names count]; i < count; i++) {
    NSString     *key;
    NSDictionary *kAttr;
    
    key   = [_names objectAtIndex:i];
    kAttr = [attrs objectForKey:key];
    if ([[kAttr objectForKey:QCPortAttributeTypeKey] isEqualToString:_type])
      return key;
  }

  /* not found... 2nd try searching for alternate key(s) */
  if ([_type isEqualToString:QCPortTypeBoolean]) {
    alt1Type = QCPortTypeNumber;
    alt2Type = QCPortTypeIndex;
  }
  else {
    alt1Type = nil;
    alt2Type = nil;
  }

  for (i = 0; i < count; i++) {
    NSString     *key;
    NSDictionary *kAttr;
    NSString     *type;
  
    key   = [_names objectAtIndex:i];
    kAttr = [attrs objectForKey:key];
    type  = [kAttr objectForKey:QCPortAttributeTypeKey];
    if (type == alt1Type)                   return key;
    else if(alt2Type && (type == alt2Type)) return key;
  }
  
  return nil; /* definitely not found */
}

@end /* QuartzCView */

@implementation RendererChainObject

static NSNumber *vYES = nil;
static NSNumber *vNO  = nil;

+ (void)initialize {
  static BOOL didInit = NO;
  if (didInit) return;
  didInit = YES;
  vYES    = [[NSNumber numberWithBool:YES] retain];
  vNO     = [[NSNumber numberWithBool:NO]  retain];
}


- (id)initWithRenderer:(QCRenderer *)_renderer {
  self = [super init];
  if (self) {
    self->renderer  = [_renderer retain];
    self->inputKey  = [[_renderer inputImageKey] retain];
    self->outputKey = [[_renderer outputImageKey] retain];
    self->flipKey   = [[_renderer shouldFlipKey] retain];
  }
  return self;
}

- (void)dealloc {
  [self->renderer  release];
  [self->inputKey  release];
  [self->outputKey release];
  [self->flipKey   release];
  [super dealloc];
}

- (id)renderer {
  return self->renderer;
}

- (void)setInput:(CIImage *)_input {
  [self->renderer setValue:_input forInputKey:self->inputKey];
}

- (CIImage *)input {
  return [self->renderer valueForInputKey:self->inputKey];
}

- (CIImage *)output {
  return [self->renderer valueForOutputKey:self->outputKey];
}

- (BOOL)canFlipImage {
  return self->flipKey != nil;
}

- (void)setShouldFlipImage:(BOOL)_yn {
  if (self->flipKey)
    [self->renderer setValue:_yn ? vYES : vNO forInputKey:self->flipKey];
}

@end /* RendererChainObject */

@implementation RendererChain

- (id)init {
  self = [super init];
  if (self) {
    self->chain = [[NSMutableArray alloc] initWithCapacity:3];
  }
  return self;
}

- (void)dealloc {
  [self->chain release];
  [super dealloc];
}

- (void)setShouldFlipImage:(BOOL)_yn {
  /*
   if (_yn && self->renderer && !self->kFlip)
   NSLog(@"INFO: should flip image, but current qtz effect '%@' doesn\'t "
         @"support it - emulating it, instead.", [self qtzFilePath]);
   */
  self->shouldFlip = _yn;
}

- (RendererChainObject *)rendererChainObjectAtIndex:(unsigned)_idx {
  return [self->chain objectAtIndex:_idx];
}

- (void)insertRenderer:(QCRenderer *)_renderer atIndex:(unsigned)_idx {
  RendererChainObject *co;
  
  co = [[RendererChainObject alloc] initWithRenderer:_renderer];
  [self->chain insertObject:co atIndex:_idx];
  if ([co canFlipImage]          &&
      (self->doFlipAtIndex == 0) &&
      (_idx != self->doFlipAtIndex))
  {
    [[self rendererChainObjectAtIndex:self->doFlipAtIndex]
           setShouldFlipImage:NO];
    self->doFlipAtIndex = _idx;
  }
  [co release];
}

- (void)appendRenderer:(QCRenderer *)_renderer {
  [self insertRenderer:_renderer atIndex:[self->chain count]];
}

- (unsigned)rendererCount {
  return [self->chain count];
}

- (BOOL)hasCustomRenderers {
  return [self rendererCount] > 1;
}

- (void)removeLastCustomRenderer {
  if ([self hasCustomRenderers]) {
    if (self->doFlipAtIndex == ([self rendererCount] - 1))
      self->doFlipAtIndex = 0;
    [self->chain removeLastObject];
  }
}

- (void)removeCustomRenderers {
  while ([self hasCustomRenderers])
    [self removeLastCustomRenderer];
}

- (CIImage *)imageByRenderingImage:(CIImage *)_input {
  CIImage             *img;
  NSTimeInterval      time;
  RendererChainObject *co;
  unsigned            i, count;

  time = [NSDate timeIntervalSinceReferenceDate];	
  if (self->startTime == 0) {
    self->startTime = time;
    time            = 0;
  }
  else {
    time -= self->startTime;
  }

  img = _input;
  for (i = 0, count = [self rendererCount]; i < count; i++) {
    co = [self rendererChainObjectAtIndex:i];
    [co setInput:img];
    if (i == self->doFlipAtIndex)
      [co setShouldFlipImage:self->shouldFlip];
    if (![[co renderer] renderAtTime:time arguments:nil])
      NSLog(@"INFO: renderer '%@' failed at time %.3fs", [co renderer], time);
    img = [co output];
  }
  return img;
}

- (CIImage *)input {
  if ([self rendererCount] == 0) return nil;
  return [[self->chain objectAtIndex:0] input];
}

- (CIImage *)output {
  return [[self->chain lastObject] output];
}

@end /* RendererChain */