Add button to check ingest in prefs

prefs/Resources/Root.plist

 			<key>showValue</key>
 			<true/>
 		</dict>
+		<dict>
+			<key>cell</key>
+			<string>PSGroupCell</string>
+			<key>footerText</key>
+			<string>Displays how far behind the ingest is (i.e. how long ago the most recently archived comment and post were created).</string>
+		</dict>
+		<dict>
+			<key>cell</key>
+			<string>PSButtonCell</string>
+			<key>label</key>
+			<string>Check Latest Ingest Times</string>
+			<key>action</key>
+			<string>checkLatest:</string>
+		</dict>
 	</array>
 	<key>title</key>
 	<string>TFDidThatSay?</string>

prefs/TFDTSRootListController.h

 #import <Preferences/PSListController.h>
+#import <Preferences/PSSpecifier.h>
 
-@interface TFDTSRootListController : PSListController
+#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
 
+@interface TFDTSRootListController : PSListController
+@property(strong, nonatomic) PSSpecifier *latestPostSpecifier;
+@property(strong, nonatomic) PSSpecifier *latestCommentSpecifier;
+- (void)checkLatest:(PSSpecifier *)arg1;
+- (void)performPushshiftRequest:(BOOL)isComment insertAfterSpecifier:(PSSpecifier *)arg2;
+- (void)insertLatestTimeCell:(NSDictionary *)data;
+- (void)possiblyBothChecksComplete:(PSSpecifier *)arg1;
 @end

prefs/TFDTSRootListController.m

 #include "TFDTSRootListController.h"
-#import <Preferences/PSSpecifier.h>
 
 @implementation TFDTSRootListController
 
+- (instancetype)init {
+
+	self = [super init];
+
+	if (self) {
+
+	}
+
+	return self;
+}
+
 - (NSArray *)specifiers {
 	if (!_specifiers) {
 		_specifiers = [self loadSpecifiersFromPlistName:@"Root" target:self];
 	}
 }
 
+- (void)checkLatest:(PSSpecifier *)arg1 {
+
+	NSIndexPath *indexPath = [self indexPathForSpecifier:arg1];
+	UITableViewCell *cell = [self.table cellForRowAtIndexPath:indexPath];
+
+	cell.userInteractionEnabled = NO;
+
+	UIActivityIndicatorView *activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
+
+	if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"13.0")) {
+		activityView.activityIndicatorViewStyle = UIScreen.mainScreen.traitCollection.userInterfaceStyle == UIUserInterfaceStyleDark ? UIActivityIndicatorViewStyleWhite : UIActivityIndicatorViewStyleGray;
+	}
+
+	[cell setAccessoryView:activityView];
+	[activityView startAnimating];
+
+	// removes latest time rows if they already exist
+	if (_latestPostSpecifier) {
+		[self removeSpecifier:_latestPostSpecifier animated:YES];
+		_latestPostSpecifier = nil;
+	}
+	if (_latestCommentSpecifier) {
+		[self removeSpecifier:_latestCommentSpecifier animated:YES];
+		_latestCommentSpecifier = nil;
+	}
+
+	// performs the requests for the most recent comment and post
+	[self performPushshiftRequest:YES insertAfterSpecifier:arg1];
+	[self performPushshiftRequest:NO insertAfterSpecifier:arg1];
+}
+
+- (void)performPushshiftRequest:(BOOL)isComment insertAfterSpecifier:(PSSpecifier *)arg2 {
+
+	NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
+	//NSOperationQueue *queue = [[NSOperationQueue alloc] init];
+
+	if (isComment){
+		[request setURL:[NSURL URLWithString:@"https://api.pushshift.io/reddit/search/comment/?fields=created_utc&size=1"]];
+	} else {
+		[request setURL:[NSURL URLWithString:@"https://api.pushshift.io/reddit/search/submission/?fields=created_utc&size=1"]];
+	}
+
+	[request setHTTPMethod:@"GET"];
+	[request setTimeoutInterval:10];
+
+	NSURLSessionDataTask *dataTask = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
+	//[NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
+
+		NSString *resultText;
+
+		if (data) {
+			id jsonData = [[NSJSONSerialization JSONObjectWithData:data options:0 error:&error] objectForKey:@"data"];
+			if (jsonData && [jsonData count] != 0) {
+
+				NSString *epochStr = jsonData[0][@"created_utc"];
+				NSDate *creationDate = [NSDate dateWithTimeIntervalSince1970:[epochStr intValue]];
+
+				// months and years? not really needed
+				unsigned int unitFlags =  NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
+
+				NSDateComponents *components = [[NSCalendar currentCalendar] components:unitFlags fromDate:creationDate toDate:[NSDate date] options:0];
+				NSInteger days = [components day];
+				NSInteger hours = [components hour];
+				NSInteger minutes = [components minute];
+				NSInteger seconds = [components second];
+
+				NSMutableString *timeSinceString = [NSMutableString string];
+
+				BOOL prevComponentUsed = NO;
+
+				if (days > 0) {
+					[timeSinceString appendFormat:@"%lid, ", (long)days];
+					prevComponentUsed = YES;
+				}
+				if (hours > 0 || prevComponentUsed) {
+					[timeSinceString appendFormat:@"%lih, ", (long)hours];
+					prevComponentUsed = YES;
+				}
+				if (minutes > 0 || prevComponentUsed) {
+					[timeSinceString appendFormat:@"%lim, ", (long)minutes];
+					prevComponentUsed = YES;
+				}
+				if (seconds > 0 || prevComponentUsed) {
+					[timeSinceString appendFormat:@"%lis ", (long)seconds];
+				}
+
+				[timeSinceString appendString:@"ago"];
+				resultText = timeSinceString;
+
+			} else {
+				resultText = @"no data returned";
+			}
+		}
+
+		if (error) {
+			resultText = [NSString stringWithFormat:@"an error occurred. HTTP Status Code: %li, Error Description: %@",
+			(long)((NSHTTPURLResponse *)response).statusCode, [error localizedDescription]];
+		}
+
+		NSString *labelText = [NSString stringWithFormat:@"Last %@: %@", isComment ? @"Comment" : @"Post", resultText];
+
+		// specifier to create new table row
+		PSSpecifier *customSpecifier = [PSSpecifier preferenceSpecifierNamed:labelText target:self set:NULL get:NULL detail:Nil cell:PSStaticTextCell edit:Nil];
+		[customSpecifier setProperty:labelText forKey:@"label"];
+		[customSpecifier setProperty: @"PSStaticTextCell" forKey:@"cell"];
+
+		if (isComment) {
+			_latestCommentSpecifier = customSpecifier;
+		} else {
+			_latestPostSpecifier = customSpecifier;
+		}
+
+		NSDictionary *dataDict = @{@"custom_specifier" : customSpecifier, @"after_specifier" : arg2};
+		[self performSelectorOnMainThread:@selector(insertLatestTimeCell:) withObject:dataDict waitUntilDone:NO];
+		[self performSelectorOnMainThread:@selector(possiblyBothChecksComplete:) withObject:arg2 waitUntilDone:NO];
+	}];
+	[dataTask resume];
+}
+
+- (void)insertLatestTimeCell:(NSDictionary *)data {
+	if (data[@"custom_specifier"] && data[@"after_specifier"]) {
+		[self insertSpecifier:data[@"custom_specifier"] afterSpecifier:data[@"after_specifier"] animated:YES];
+	}
+}
+
+- (void)possiblyBothChecksComplete:(PSSpecifier *)arg1 {
+
+	// only when both the comment and the post request have finished
+	if (_latestPostSpecifier && _latestCommentSpecifier) {
+
+		NSIndexPath *indexPath = [self indexPathForSpecifier:arg1];
+		UITableViewCell *cell = [self.table cellForRowAtIndexPath:indexPath];
+
+		if (cell) {
+			UIActivityIndicatorView *activityView = (UIActivityIndicatorView *)[cell accessoryView];
+			[activityView stopAnimating];
+			[cell setAccessoryView:nil];
+
+			cell.userInteractionEnabled = YES;
+		}
+	}
+}
+
 @end