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//
// DTTextAttachment.m
// CoreTextExtensions
//
// Created by Oliver on 14.01.11.
// Copyright 2011 Drobnik.com. All rights reserved.
//

#import "DTTextAttachment.h"
#import "DTHTMLElement.h"
#import "CGUtils.h"
#import "NSAttributedString+HTML.h"
#import "NSData+DTBase64.h"

@implementation DTTextAttachment
{
CGSize _originalSize;
CGSize _displaySize;
id contents;
    NSDictionary *_attributes;
    
    DTTextAttachmentType contentType;

NSURL *_contentURL;
NSURL *_hyperLinkURL;
}

+ (DTTextAttachment *)textAttachmentWithElement:(DTHTMLElement *)element options:(NSDictionary *)options
{
// determine type
DTTextAttachmentType attachmentType;

if ([element.tagName isEqualToString:@"img"])
{
attachmentType = DTTextAttachmentTypeImage;
}
else if ([element.tagName isEqualToString:@"video"])
{
attachmentType = DTTextAttachmentTypeVideoURL;
}
else if ([element.tagName isEqualToString:@"iframe"])
{
attachmentType = DTTextAttachmentTypeIframe;
}
else if ([element.tagName isEqualToString:@"object"])
{
attachmentType = DTTextAttachmentTypeObject;
}
else
{
return nil;
}

// determine if there is a display size restriction
CGSize maxImageSize = CGSizeZero;

NSValue *maxImageSizeValue =[options objectForKey:DTMaxImageSize];
if (maxImageSizeValue)
{
maxImageSize = [maxImageSizeValue CGSizeValue];
}

// width, height from tag
CGSize displaySize = element.size; // width/height from attributes or CSS style
CGSize originalSize = element.size;

// get base URL
NSURL *baseURL = [options objectForKey:NSBaseURLDocumentOption];

// decode URL
NSString *src = [element attributeForKey:@"src"];

NSURL *contentURL = nil;
UIImage *decodedImage = nil;


// decode content URL
if ([src hasPrefix:@"data:"])
{
NSRange range = [src rangeOfString:@"base64,"];

if (range.length)
{
NSString *encodedData = [src substringFromIndex:range.location + range.length];
NSData *decodedData = [NSData dataFromBase64String:encodedData];

decodedImage = [UIImage imageWithData:decodedData];

if (!displaySize.width || !displaySize.height)
{
displaySize = decodedImage.size;
}
}
}
else // normal URL
{
contentURL = [NSURL URLWithString:src];

if (![contentURL scheme])
{
// possibly a relative url
if (baseURL)
{
contentURL = [NSURL URLWithString:src relativeToURL:baseURL];
}
else
{
// file in app bundle
NSString *path = [[NSBundle mainBundle] pathForResource:src ofType:nil];
if (path) {
// Prevent a crash if path turns up nil.
contentURL = [NSURL fileURLWithPath:path];
}
}
}
}

DTTextAttachment *attachment = [[DTTextAttachment alloc] init];

// for local images we can get their size by inspecting them
if (attachmentType == DTTextAttachmentTypeImage)
{
// if it's a local file we need to inspect it to get it's dimensions
if (!displaySize.width || !displaySize.height)
{
// inspect local file
if ([contentURL isFileURL])
{
UIImage *image = [UIImage imageWithContentsOfFile:[contentURL path]];
originalSize = image.size;

if (!displaySize.width || !displaySize.height)
{
displaySize = originalSize;
}
}
else
{
// remote image, we have to relayout once this size is known
displaySize = CGSizeMake(1, 1); // one pixel so that loading is triggered
}
}

// we copy the link because we might need for it making the custom view
if (element.link)
{
attachment.hyperLinkURL = element.link;
}
}


// if you have no display size we assume original size
if (CGSizeEqualToSize(displaySize, CGSizeZero))
{
displaySize = originalSize;
}

// adjust the display size if there is a restriction and it's too large
CGSize adjustedSize = displaySize;

if (maxImageSize.width>0 && maxImageSize.height>0)
{
if (maxImageSize.width < displaySize.width || maxImageSize.height < displaySize.height)
{
adjustedSize = sizeThatFitsKeepingAspectRatio(displaySize, maxImageSize);
}

// still no display size? use max size
if (CGSizeEqualToSize(displaySize, CGSizeZero))
{
adjustedSize = maxImageSize;
}
}

attachment.contentType = attachmentType;
attachment.contentURL = contentURL;
attachment.contents = decodedImage;
attachment.originalSize = originalSize;
attachment.displaySize = adjustedSize;
attachment.attributes = element.attributes;

return attachment;
}


// makes a data URL of the image
- (NSString *)dataURLRepresentation
{
if (!contents || contentType != DTTextAttachmentTypeImage)
{
return nil;
}

NSData *data = UIImagePNGRepresentation(contents);
NSString *encoded = [data base64EncodedString];

return [@"data:image/png;base64," stringByAppendingString:encoded];
}


#pragma mark Properties

- (void)setOriginalSize:(CGSize)originalSize
{
_originalSize = originalSize;
self.displaySize = _originalSize;
}

- (id)contents
{
if (!contents)
{
if (contentType == DTTextAttachmentTypeImage && _contentURL && [_contentURL isFileURL])
{
UIImage *image = [UIImage imageWithContentsOfFile:[_contentURL path]];

return image;
}
}

return contents;
}

@synthesize originalSize = _originalSize;
@synthesize displaySize = _displaySize;
@synthesize contents;
@synthesize contentType;
@synthesize contentURL = _contentURL;
@synthesize hyperLinkURL = _hyperLinkURL;
@synthesize attributes = _attributes;

@end
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