BAJSONViewController.m

/*
 Copyright 2012 Dmitry Stadnik. All rights reserved.

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

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

 2. 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.

 THIS SOFTWARE IS PROVIDED BY DMITRY STADNIK ``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 DMITRY STADNIK 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.

 The views and conclusions contained in the software and documentation are those of the
 authors and should not be interpreted as representing official policies, either expressed
 or implied, of Dmitry Stadnik.
 */

#import "BAJSONViewController.h"
#import "BATextViewController.h"
#import "BACommon.h"
#import "BARuntime.h"

@interface BAJSONViewController ()

@end

@implementation BAJSONViewController {
	id _JSONValue;
	NSArray *_allSortedKeys;
}

- (void)dealloc {
    [_JSONValue release];
	[_allSortedKeys release];
    [super dealloc];
}

- (id)JSONValue {
	return _JSONValue;
}

- (void)setJSONValue:(id)JSONValue {
	if (_JSONValue == JSONValue) {
		return;
	}
	[_allSortedKeys release];
	_allSortedKeys = nil;
	[_JSONValue release];
	_JSONValue = [JSONValue retain];
	if ([self isViewLoaded]) {
		[self.tableView reloadData];
	}
}

- (NSArray *)allSortedKeys {
	if (!_allSortedKeys) {
		if ([self.JSONValue isKindOfClass:[NSDictionary class]]) {
			_allSortedKeys = [[[self.JSONValue allKeys] sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
				if ([obj1 isKindOfClass:[NSString class]] && [obj2 isKindOfClass:[NSString class]]) {
					return [obj1 compare:obj2 options:NSLiteralSearch];
				}
				return NSOrderedSame;
			}] retain];
		} else {
			_allSortedKeys = [[NSArray array] retain];
		}
	}
	return _allSortedKeys;
}

- (NSString *)JSONDetails:(id)JSONValue {
	if ([JSONValue isKindOfClass:[NSArray class]]) {
		return [NSString stringWithFormat:@"[%d]", [JSONValue count]];
	} else if ([JSONValue isKindOfClass:[NSDictionary class]]) {
		return [NSString stringWithFormat:@"{%d}", [JSONValue count]];
	} else if (JSONValue) {
		return [JSONValue description];
	} else {
		return @"";
	}
}

- (NSUInteger)JSONChildrenCount {
	if ([self.JSONValue isKindOfClass:[NSArray class]]) {
		return [self.JSONValue count];
	} else if ([self.JSONValue isKindOfClass:[NSDictionary class]]) {
		return [[self allSortedKeys] count];
	} else {
		return 0;
	}
}

- (id)JSONChildKeyAtIndex:(NSUInteger)index {
	if ([self.JSONValue isKindOfClass:[NSArray class]]) {
		return [NSNumber numberWithUnsignedInteger:index];
	} else if ([self.JSONValue isKindOfClass:[NSDictionary class]]) {
		return [[self allSortedKeys] objectAtIndex:index];
	} else {
		return nil;
	}
}

- (id)JSONChildValueAtIndex:(NSUInteger)index {
	if ([self.JSONValue isKindOfClass:[NSArray class]]) {
		return [self.JSONValue objectAtIndex:index];
	} else if ([self.JSONValue isKindOfClass:[NSDictionary class]]) {
		id key = [[self allSortedKeys] objectAtIndex:index];
		return [self.JSONValue objectForKey:key];
	} else {
		return nil;
	}
}

- (void)showRawJSONValue {
	if (self.JSONValue) {
		NSError *error = nil;
		NSString *string = [BARuntime serializeJSONToString:self.JSONValue formatted:YES error:&error];
		if (string) {
			BATextViewController *controller = [[[BATextViewController alloc] init] autorelease];
			controller.navigationItem.title = self.navigationItem.title;
			controller.textView.text = string;
			[self.navigationController pushViewController:controller animated:YES];
		} else {
			NSString *message = error ? [error localizedDescription] : @"Unable to serialize JSON value";
			BAAlert(@"Error", message);
		}
	} else {
		BAAlert(@"Error", @"No JSON value");
	}
}

- (void)viewDidLoad {
    [super viewDidLoad];
	self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction
																							target:self
																							action:@selector(showRawJSONValue)] autorelease];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;
}

#pragma mark - Table view

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return [self JSONChildrenCount];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"BAJSONCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
	if (!cell) {
		cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1
									   reuseIdentifier:CellIdentifier] autorelease];
	}
	id key = [self JSONChildKeyAtIndex:indexPath.row];
	id value = [self JSONChildValueAtIndex:indexPath.row];
	cell.textLabel.text = key ? [key description] : @"";
	cell.detailTextLabel.text = [self JSONDetails:value];
	cell.selectionStyle = value ? UITableViewCellSelectionStyleBlue : UITableViewCellSelectionStyleNone;
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
	id key = [self JSONChildKeyAtIndex:indexPath.row];
	id value = [self JSONChildValueAtIndex:indexPath.row];
	if ([value isKindOfClass:[NSArray class]] || [value isKindOfClass:[NSDictionary class]]) {
		BAJSONViewController *controller = [[[BAJSONViewController alloc] initWithStyle:self.tableView.style] autorelease];
		controller.navigationItem.title = key ? [key description] : @"";
		controller.JSONValue = value;
		[self.navigationController pushViewController:controller animated:YES];
	} else if (value) {
		BATextViewController *controller = [[[BATextViewController alloc] init] autorelease];
		controller.navigationItem.title = key ? [key description] : @"";
		controller.textView.text = [value description];
		[self.navigationController pushViewController:controller animated:YES];
	}
}

@end