//
//  ViewController.m
//  QLPreview
//
//  Created by Don Mag on 10/24/22.
//

#import "ViewController.h"

@import QuickLook;

/*
 *  Quicklook Preview Item
 */
@interface PreviewItem : NSObject <QLPreviewItem>
@property(readonly, nullable, nonatomic) NSURL    *previewItemURL;
@property(readonly, nullable, nonatomic) NSString *previewItemTitle;
@end
@implementation PreviewItem
- (instancetype)initPreviewURL:(NSURL *)docURL
					 WithTitle:(NSString *)title {
	self = [super init];
	if (self) {
		_previewItemURL = [docURL copy];
		_previewItemTitle = [title copy];
	}
	return self;
}
@end
/***/

/*
 *  QuickLook Datasource for rending PDF docs
 */
@interface PDFDataSource : NSObject <QLPreviewControllerDataSource>
@property (strong, nonatomic) PreviewItem *item;
@end
@implementation PDFDataSource
- (instancetype)initWithPreviewItem:(PreviewItem *)item {
	self = [super init];
	if (self) {
		_item = item;
	}
	return self;
}
- (NSInteger)numberOfPreviewItemsInPreviewController:(QLPreviewController *)controller {
	return 1;
}
- (id<QLPreviewItem>)previewController:(QLPreviewController *)controller previewItemAtIndex:(NSInteger)index {
	return self.item;
}
@end
/***/

@interface ViewController ()

@property (strong, nonatomic) PDFDataSource *pdfDatasource;

@end

@implementation ViewController

- (void)viewDidLoad {
	[super viewDidLoad];
	
	self.view.backgroundColor = UIColor.systemBlueColor;
	
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
	
	/*
	 *  get the path to the pdf resource.
	 */
	
	NSString *path =
	[[NSBundle mainBundle] pathForResource:@"article"
									ofType:@"pdf"];
	
	if (!path) {
		NSLog(@"Could not find article.pdf in bundle!");
		return;
	}
	
	NSURL *docURL = [NSURL fileURLWithPath:path];
	
	
	/*
	 *  create the Quicklook controller.
	 */
	
	QLPreviewController *qlController =
	[[QLPreviewController alloc] init];
	
	PreviewItem *item =
	[[PreviewItem alloc] initPreviewURL:docURL
							  WithTitle:@"Article"];
	self.pdfDatasource =
	[[PDFDataSource alloc] initWithPreviewItem:item];
	
	qlController.dataSource = self.pdfDatasource;
	
	
	/*
	 *  present the document.
	 */
	
	[self presentViewController:qlController
					   animated:YES completion:nil];
}

@end