/*

     File: RecipePrintPageRenderer.m 

 Abstract: A custom UIPrintPageRenderer to render one or more Recipes for printing 

  Version: 1.2 

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 Neither the name, trademarks, service marks or logos of Apple Inc. may 

 be used to endorse or promote products derived from the Apple Software 

 without specific prior written permission from Apple.  Except as 

 expressly stated in this notice, no other rights or licenses, express or 

 implied, are granted by Apple herein, including but not limited to any 

 patent rights that may be infringed by your derivative works or by other 

 works in which the Apple Software may be incorporated. 

 The Apple Software is provided by Apple on an "AS IS" basis.  APPLE 

 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION 

 THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS 

 FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND 

 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS. 

 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL 

 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 

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 Copyright (C) 2013 Apple Inc. All Rights Reserved. 

 */ 

#import "RecipePrintPageRenderer.h"

#import "Recipe.h"

#import <objc/runtime.h>

/*

 Set up some values for the constant properties of our custom

 recipe printed presentation.

 */

#define HEADER_HEIGHT 20

#define FOOTER_HEIGHT 20

#define PADDING 10

#define TITLE_SIZE 24

#define SYSTEM_FONT [UIFont systemFontOfSize:[UIFont systemFontSize]]

@interface RecipePrintPageRenderer ()

@property (nonatomic) CGFloat recipeInfoHeight;

- (void)setupPrintFormatters;

- (CGRect)contentArea;

- (void)drawRecipe:(Recipe *)recipe inRect:(CGRect)rect;

- (void)drawRecipeImage:(UIImage *)image inRect:(CGRect)rect;

- (void)drawRecipeName:(NSString *)name inRect:(CGRect)rect;

- (void)drawRecipeInfo:(NSString *)info inRect:(CGRect)rect;

@end

@implementation RecipePrintPageRenderer

{

    NSRange pageRange;

    NSArray *recipes;

    NSMapTable *formatterToRecipeMap;

}

/*

 Initialize to our constant values.

 */

- (id)initWithRecipes:(NSArray *)someRecipes

{

    self = [super init];

    if (self) {

        recipes = [someRecipes copy];

        formatterToRecipeMap = [NSMapTable strongToStrongObjectsMapTable];

        self.headerHeight = HEADER_HEIGHT;

        self.footerHeight = FOOTER_HEIGHT;

        self.recipeInfoHeight = 150;

    }

    return self;

}

/*

 Release ownership.

 */

#pragma mark -

/*

 Calculate the content area based on the printableRect, that is, 

 the area in which the printer can print content. a.k.a the imageable area of the paper.

 */

- (CGRect)contentArea {

    CGRect r = self.printableRect;

    r.origin.y += self.headerHeight;

    r.size.height -= self.headerHeight + self.footerHeight;

    return r;

}

- (void)prepareForDrawingPages:(NSRange)range {

    pageRange = range;

    [super prepareForDrawingPages:range];

}

#pragma mark -

/*

 This method must be overriden when doing custom drawing as we are. 

 Since our custom drawing is really only for the borders and we are 

 relying on a series of UIMarkupTextPrintFormatter to display the recipe

 content, UIKit can calculate the number of pages based on informtation

 provided by those formatters. 

 Therefore, setup the formatters, and ask super to count the pages.

 */

- (NSInteger)numberOfPages {

    self.printFormatters = nil;

    [self setupPrintFormatters];

    return [super numberOfPages];

}

/*

 Iterate through the recipes setting each of their html representations into 

 a UIMarkupTextPrintFormatter and add that formatter to the printing job.

 */

- (void)setupPrintFormatters {

    NSInteger page = 0;

    CGFloat previousFormatterMaxY = CGRectGetMinY(self.contentArea);

    for (Recipe *recipe in recipes) {

        NSString *html = recipe.htmlRepresentation;

        UIMarkupTextPrintFormatter *formatter = [[UIMarkupTextPrintFormatter alloc] initWithMarkupText:html];

        [formatterToRecipeMap setObject:recipe forKey:formatter];

        // Make room for the recipe info

        UIEdgeInsets contentInsets = UIEdgeInsetsZero;

        contentInsets.top = previousFormatterMaxY + self.recipeInfoHeight;

        if (contentInsets.top > CGRectGetMaxY(self.contentArea)) {

            // Move to the next page

            page++;

            contentInsets.top = CGRectGetMinY(self.contentArea) + self.recipeInfoHeight;

        }

        formatter.contentInsets = contentInsets;

        // Add the formatter to the renderer at the specified page

        [self addPrintFormatter:formatter startingAtPageAtIndex:page];

        page = formatter.startPage + formatter.pageCount - 1;

        previousFormatterMaxY = CGRectGetMaxY([formatter rectForPageAtIndex:page]);

    }

}

#pragma mark -

/*

 Custom UIPrintPageRenderer's may override this class to draw a custom print page header. 

 To illustrate that, this class sets the date in the header.

 */

- (void)drawHeaderForPageAtIndex:(NSInteger)pageIndex inRect:(CGRect)headerRect {

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

    [dateFormatter setDateFormat:@"MMMM d, yyyy 'at' h:mm a"];

    NSString *dateString = [dateFormatter stringFromDate:[NSDate date]];

    [dateString drawInRect:headerRect withAttributes:nil];

}

/*

 Custom UIPrintPageRenderer's may also override this class to draw a custom print page footer. 

 To illustrate that, this class sets the current and total page number in the footer.

 */

- (void)drawFooterForPageAtIndex:(NSInteger)pageIndex inRect:(CGRect)footerRect {

    NSString *footer = [NSString stringWithFormat:@"Page %d of %d", pageIndex - pageRange.location + 1, pageRange.length];

    [footer drawInRect:footerRect withAttributes:nil];

}

/*

 to intermix custom drawing with the drawing performed by an associated print formatter, this method is called for each 

 print formatter associated with a given page.

 We do this to intermix/overlay our custom drawing onto the recipe presentation.

 We draw the upper portion of the recipe presentation by hand (image, title, desc), 

    and the bottom portion is drawn via the UIMarkupTextPrintFormatter.

 */

- (void)drawPrintFormatter:(UIPrintFormatter *)printFormatter forPageAtIndex:(NSInteger)pageIndex {

    [super drawPrintFormatter:printFormatter forPageAtIndex:pageIndex];

    /*

     To keep our custom drawing in sync with the printFormatter, base our drawing

     on the formatters rect.

     */

    CGRect rect = [printFormatter rectForPageAtIndex:pageIndex];

    /*

     Use a bezier path to draw the borders.

     We may potentially choose not to draw either the top or bottom line

     of the border depending on whether our recipe extended from the previous

     page, or carries onto the subsequent page.

     */

    UIBezierPath *border = [UIBezierPath bezierPath];

    if (pageIndex == printFormatter.startPage) {

        // For border drawing, get the rect that includes the formatter area plus the header area.

        // Move the formatter's rect up the size of the custom drawn recipe presentation

        //  and essentially grow the rect's height by this amount.

        rect.origin.y -= self.recipeInfoHeight;

        rect.size.height += self.recipeInfoHeight;

        [border moveToPoint:rect.origin];

        [border addLineToPoint:CGPointMake(CGRectGetMaxX(rect), CGRectGetMinY(rect))];

        Recipe *recipe = [formatterToRecipeMap objectForKey:printFormatter];

        // Run custom code to draw upper portion of the recipe presentation (image, title, desc)

        [self drawRecipe:recipe inRect:rect];

    }

    // Draw the left border

    [border moveToPoint:rect.origin];

    [border addLineToPoint:CGPointMake(CGRectGetMinX(rect), CGRectGetMaxY(rect))];

    // Draw the right border

    [border moveToPoint:CGPointMake(CGRectGetMaxX(rect), CGRectGetMinY(rect))];

    [border addLineToPoint:CGPointMake(CGRectGetMaxX(rect), CGRectGetMaxY(rect))];

    if (pageIndex == printFormatter.startPage + printFormatter.pageCount - 1) {

        [border addLineToPoint:CGPointMake(CGRectGetMinX(rect), CGRectGetMaxY(rect))];

    }

    /*

     Set the UIColor to be used by the current graphics context, and then stroke 

     stroke the current path that is defined by the border bezier path.

     */

    [[UIColor blackColor] set];

    [border stroke];

}

/*

 Custom code to draw upper portion of the recipe presentation (image, title, desc).

 The argument rect is the full size of the recipe presentation.

 */

- (void)drawRecipe:(Recipe *)recipe inRect:(CGRect)rect {

    [self drawRecipeImage:recipe.image inRect:rect];

    [self drawRecipeName:recipe.name inRect:rect];

    [self drawRecipeInfo:recipe.aggregatedInfo inRect:rect];

}

- (void)drawRecipeImage:(UIImage *)image inRect:(CGRect)rect {

    // Create a new rect based on the size of the header area

    CGRect imageRect = CGRectZero;

    // Scale the image to fit in the infoRect

    CGFloat maxImageDimension = self.recipeInfoHeight - PADDING*2;

    CGFloat largestImageDimension = MAX(image.size.width, image.size.height);

    CGFloat scale = maxImageDimension / largestImageDimension;    

    imageRect.size.width = image.size.width * scale;

    imageRect.size.height = image.size.height * scale;

    // Place the image rect at the x,y defined by the argument rect

    imageRect.origin = CGPointMake(CGRectGetMinX(rect) + PADDING, CGRectGetMinY(rect) + PADDING);

    // Ask the image to draw in the image rect

    [image drawInRect:imageRect];

}

// Custom drawing code to put the recipe name in the title section of the recipe presentation's header

- (void)drawRecipeName:(NSString *)name inRect:(CGRect)rect {

    CGRect nameRect = CGRectZero;

    nameRect.origin.x = CGRectGetMinX(rect) + self.recipeInfoHeight;

    nameRect.origin.y = CGRectGetMinY(rect) + PADDING;

    nameRect.size.width = CGRectGetWidth(rect) - self.recipeInfoHeight;

    nameRect.size.height = self.recipeInfoHeight;

    [name drawInRect:nameRect withAttributes:nil];

}

// Custom drawing code to put the recipe recipe description, and prep time 

// in the title section of the recipe presentation's header

- (void)drawRecipeInfo:(NSString *)info inRect:(CGRect)rect {

    CGRect infoRect = CGRectZero;

    infoRect.origin.x = CGRectGetMinX(rect) + self.recipeInfoHeight;

    infoRect.origin.y = CGRectGetMinY(rect) + TITLE_SIZE*2;

    infoRect.size.width = CGRectGetWidth(rect) - self.recipeInfoHeight;

    infoRect.size.height = self.recipeInfoHeight - TITLE_SIZE*2;

    [[UIColor darkGrayColor] set];

    [info drawInRect:infoRect withAttributes:nil];

}

@end