/*

     File: main.m

 Abstract: The main file.

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

 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 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

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 */

#import <Foundation/Foundation.h>

#import <CoreData/CoreData.h>

#import "Run.h"

NSManagedObjectModel *managedObjectModel();

NSManagedObjectContext *managedObjectContext();

NSURL *applicationLogDirectory();

NSString *STORE_TYPE;

NSString *STORE_FILENAME;

NSString *SUPPORT_DIRECTORY;

int main (int argc, const char * argv[])

{

    @autoreleasepool {

        STORE_TYPE = NSXMLStoreType;

        STORE_FILENAME = @"CDCLI.cdcli";

        SUPPORT_DIRECTORY = @"CDCLI";

        NSManagedObjectModel *mom = managedObjectModel();

        NSLog(@"mom: %@", mom); 

        if (applicationLogDirectory() == nil) {

            NSLog(@"Could not find application logs directory\nExiting...");

            exit(1);

        }

        /*

         Get the managed object context and use it to create a new instance of the Run entity.

         */

        NSManagedObjectContext *moc = managedObjectContext();

        NSEntityDescription *runEntity = [[mom entitiesByName] objectForKey:@"Run"];

        Run *run = [[Run alloc] initWithEntity:runEntity

                insertIntoManagedObjectContext:moc];

        /*

         Tell the Run instance what its process ID is.

         */

        NSProcessInfo *processInfo = [NSProcessInfo processInfo];

        run.processID = [processInfo processIdentifier];

        NSLog(@"run.processID: %ld", run.processID);

        /*

         Save the context to commit the new Run instance to the persistent store.

         */

        NSError *error = nil;

        if (![managedObjectContext() save: &error]) {

            NSLog(@"Error while saving\n%@",

                  ([error localizedDescription] != nil) ? [error localizedDescription] : @"Unknown Error");

            exit(1);

        }

        /*

         Create a fetch request to fetch all instances of the Run entity ("all" is implied by not providing a predicate) returned in chronological order (sort by date).

         */

        NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"Run"];

        NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc]

                                            initWithKey:@"date" ascending:YES];

        [request setSortDescriptors:@[sortDescriptor]];

        /*

         Execute the fetch request.

         */

        error = nil;

        NSArray *fetchedArray = [moc executeFetchRequest:request error:&error];

        if (fetchedArray == nil) {

            NSLog(@"Error while fetching\n%@",

                  ([error localizedDescription] != nil) ? [error localizedDescription] : @"Unknown Error");

            exit(1);

        }

        /*

         List the Run instances returned from the fetch request.

         */

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

        [formatter setDateStyle:NSDateFormatterMediumStyle];

        [formatter setTimeStyle:NSDateFormatterMediumStyle];

        NSLog(@"%@ run history:", [processInfo processName]);

        for (Run *aRun in fetchedArray) {

            NSLog(@"On %@ as process ID %ld", [formatter stringForObjectValue:aRun.date], aRun.processID);

        }

        return 0;

    }

}

NSManagedObjectModel *managedObjectModel() 

{

    static NSManagedObjectModel *mom = nil;

    /*

     If the managed object model already exists, return it.

     */

    if (mom != nil) {

        return mom;   

    }

    /*

     Create an entity description object for the Run entity.

     */

    NSEntityDescription *runEntity = [[NSEntityDescription alloc] init];

    [runEntity setName:@"Run"];

    [runEntity setManagedObjectClassName:@"Run"];

    /*

     Create the attributes for the Run entity.

     The 'date' attribute is straightforward: its type is NSDateAttributeType, and it's not optional.

     */

    NSAttributeDescription *dateAttribute;

    dateAttribute = [[NSAttributeDescription alloc] init];

    [dateAttribute setName:@"date"];

    [dateAttribute setAttributeType:NSDateAttributeType];

    [dateAttribute setOptional:NO];

    /*

     The 'processID attribute 

     */

    NSAttributeDescription *idAttribute;

    idAttribute = [[NSAttributeDescription alloc] init];

    [idAttribute setName:@"processID"];

    [idAttribute setAttributeType:NSInteger64AttributeType];

    [idAttribute setOptional:NO];

    [idAttribute setDefaultValue:@0];

    NSExpression *lhs = [NSExpression expressionForEvaluatedObject];

    NSExpression *rhs = [NSExpression expressionForConstantValue:@0];

    NSPredicate *validationPredicate = [NSComparisonPredicate

                                        predicateWithLeftExpression:lhs

                                        rightExpression:rhs

                                        modifier:NSDirectPredicateModifier

                                        type:NSGreaterThanPredicateOperatorType

                                        options:0];

    NSString *validationWarning = @"Process ID < 1";

    [idAttribute setValidationPredicates:@[validationPredicate]

                  withValidationWarnings:@[validationWarning]];

    [runEntity setProperties:@[dateAttribute, idAttribute]];

    /*

     Create a new managed object model instance, and set the entities of the model to an array containing just the Run entity.

     */

    mom = [[NSManagedObjectModel alloc] init];

    [mom setEntities:@[runEntity]];

    /*

     Create a localization dictionary for the model instance, and assign it to the model.

     */

    NSDictionary *localizationDictionary = @{

        @"Property/date/Entity/Run":@"Date",

        @"Property/processID/Entity/Run":@"Process ID",

        @"ErrorString/Process ID < 1":@"Process ID must not be less than 1"

    };

    [mom setLocalizationDictionary:localizationDictionary];

    return mom;

}

NSManagedObjectContext *managedObjectContext()

{

    static NSManagedObjectContext *moc = nil;

    if (moc != nil) {

        return moc;

    }

    /*

     Create the Core Data stack:

     * A persistent store coordinator

     * The managed object context.

     The persistent store coordinator requires a managed object model; also associate a persistent store.

     Initialize the managed object context for use on the main queue, and set its persistent store coordinator.

     */

    NSPersistentStoreCoordinator *coordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: managedObjectModel()];

    NSError *error;

    /* Change this path/code to point to your App's data store. */

    NSURL *url = [applicationLogDirectory() URLByAppendingPathComponent:STORE_FILENAME];

    NSPersistentStore *newStore = [coordinator addPersistentStoreWithType:STORE_TYPE configuration:nil URL:url options:nil error:&error];

    if (newStore == nil) {

        NSLog(@"Store Configuration Failure\n%@",

              ([error localizedDescription] != nil) ?

              [error localizedDescription] : @"Unknown Error");

    }

    moc = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];

    [moc setPersistentStoreCoordinator:coordinator];

    return moc;

}

NSURL *applicationLogDirectory()

{    

    NSString *LOG_DIRECTORY = @"CDCLI";

    static NSURL *ald = nil;

    if (ald == nil) {

        NSFileManager *fileManager = [[NSFileManager alloc] init];

        NSError *error = nil;

        NSURL *libraryURL = [fileManager URLForDirectory:NSLibraryDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:YES error:&error];

        if (libraryURL == nil) {

            NSLog(@"Could not access Library directory\n%@", [error localizedDescription]);

        }

        else {

            ald = [libraryURL URLByAppendingPathComponent:@"Logs"];

            ald = [ald URLByAppendingPathComponent:LOG_DIRECTORY];

            NSDictionary *properties = [ald resourceValuesForKeys:@[NSURLIsDirectoryKey]

                                                            error:&error];

            if (properties == nil) {

                if (![fileManager createDirectoryAtURL:ald withIntermediateDirectories:YES attributes:nil error:&error]) {

                    NSLog(@"Could not create directory %@\n%@", [ald path], [error localizedDescription]);

                    ald = nil;

                }

            }

        }

    }

    return ald;

}