/*

File: InferenceRules.m

Abstract: Encapsulation of the "rules" concept used by the Inference Core.

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*/

#import "InferenceRules.h"

@implementation InferenceRules

+ (void)setup:(InferenceCore *)core {

    NSPredicate *predicate;

    InferenceObject *inference;

    InferenceRules *rule = [[InferenceRules alloc] init];

    predicate = [NSPredicate predicateWithValue:YES];

    inference = [[InferenceObject alloc] initWithTarget:rule key:@"entity"]; // target not retained 

    [core setValue:inference forKey:@"entity" condition:predicate];

    [inference release];

    predicate = [NSPredicate predicateWithFormat:@"entity.name != 'Recipe'"];

    inference = [[InferenceObject alloc] initWithTarget:rule key:@"attributeNames"]; // target not retained 

    [core setValue:inference forKey:@"attributeNames" condition:predicate];

    [inference release];

    predicate = [NSPredicate predicateWithFormat:@"entity.name == 'Recipe'"];

    NSArray *recipeSearchKeys = [NSArray arrayWithObjects:@"name", @"preparationTime", @"detailDescription", @"cookingTime", @"ingredients.name", nil];

    [core setValue:recipeSearchKeys forKey:@"attributeNames" condition:predicate];

    [inference release];    

    predicate = [NSPredicate predicateWithFormat:@"attributeType == %@", [NSNumber numberWithInt:NSStringAttributeType]];

    NSArray *operatorKeys = [NSArray arrayWithObjects:@"beginsWith", @"endsWith", @"like", @"matches", nil];

    [core setValue:operatorKeys forKey:@"operatorNames" condition:predicate];

    predicate = [NSPredicate predicateWithFormat:@"(attributeType == %@) || (attributeType == %@)", [NSNumber numberWithInt:NSInteger16AttributeType], [NSNumber numberWithInt:NSDateAttributeType]];

    operatorKeys = [NSArray arrayWithObjects:@"<", @"<=", @"==", @">", @">=", @"!=", nil];

    [core setValue:operatorKeys forKey:@"operatorNames" condition:predicate];

    predicate = [NSPredicate predicateWithFormat:@"(attributeType != %@) && (attributeType != %@) && (attributeType != %@)", [NSNumber numberWithInt:NSStringAttributeType], [NSNumber numberWithInt:NSInteger16AttributeType], [NSNumber numberWithInt:NSDateAttributeType]];

    [core setValue:[NSArray array] forKey:@"operatorNames" condition:predicate];

    // always true items

    predicate = [NSPredicate predicateWithValue:YES];

    inference = [[InferenceObject alloc] initWithTarget:rule key:@"attributeType"]; // target not retained 

    [core setValue:inference forKey:@"attributeType" condition:predicate];

    [inference release];

    inference = [[InferenceObject alloc] initWithTarget:rule key:@"selectedAttribute"]; // target not retained 

    [core setValue:inference forKey:@"selectedAttribute" condition:predicate];

    [inference release];

    inference = [[InferenceObject alloc] initWithTarget:rule key:@"primaryStore"]; // target not retained 

    [core setValue:inference forKey:@"primaryStore" condition:predicate];

    [inference release];

    inference = [[InferenceObject alloc] initWithTarget:rule key:@"inMemoryStore"]; // target not retained 

    [core setValue:inference forKey:@"inMemoryStore" condition:predicate];

    [inference release];    

    predicate = [NSPredicate predicateWithFormat:@"(selectedAttribute.entity.name != 'Recipe') && (attributeType == %@)", [NSNumber numberWithInt:NSStringAttributeType]];

    [core setValue:@"any " forKey:@"prependedAnyString" condition:predicate];

    predicate = [NSPredicate predicateWithFormat:@"(selectedAttribute.entity.name == 'Recipe') || (attributeType != %@)", [NSNumber numberWithInt:NSStringAttributeType]];

    [core setValue:@"" forKey:@"prependedAnyString" condition:predicate];

    //[rule release];

}

- (NSEntityDescription *)entity:(InferenceCore *)core {

    NSManagedObjectModel *model = [core inferredValueForKeyPath:@"managedObjectContext.persistentStoreCoordinator.managedObjectModel"];

    NSEntityDescription *entity = [[model entitiesByName] objectForKey:[core inferredValueForKeyPath:@"entityName"]];

    return entity;

}

- (NSArray *)attributeNames:(InferenceCore *)core {

    NSArray *attributeNames = [NSArray array];

    NSEntityDescription *entity = [core inferredValueForKeyPath:@"entity"];

    if (entity != nil) {

        attributeNames = [[entity attributesByName] allKeys];

    }

    return attributeNames;

}

- (NSNumber *)attributeType:(InferenceCore *)core {

    NSAttributeDescription *attribute = [core inferredValueForKeyPath:@"selectedAttribute"];    

    NSAttributeType type = NSUndefinedAttributeType;

    if (attribute != nil) {

        type = [attribute attributeType];

    }

    return [NSNumber numberWithInt:type];

}

- (NSAttributeDescription *)selectedAttribute:(InferenceCore *)core {

    NSString *selectedAttributeName = [core inferredValueForKeyPath:@"attributeName"];

    NSEntityDescription *entity = [core inferredValueForKeyPath:@"entity"];

    NSAttributeDescription *attribute = nil;

    if ((selectedAttributeName != nil) && (entity != nil)) {

        NSArray *components = [selectedAttributeName componentsSeparatedByString:@"."];

        int count = [components count];

        int index;

        if (count > 1) {

            count --;

            for (index=0; index < count; index++) {

                NSRelationshipDescription *relationship;

                NSString *propertyKey = [components objectAtIndex:index];

                relationship = [[entity relationshipsByName] objectForKey:propertyKey];

                entity = [relationship destinationEntity];

            }

        }        

        attribute = [[entity attributesByName] objectForKey:[components lastObject]];

    }

    return attribute;

}

- (id)primaryStore:(InferenceCore *)core {

    NSURL *defaultStoreURL = [core inferredValueForKeyPath:@"defaultStoreURL"];

    NSPersistentStoreCoordinator *coordinator = [core inferredValueForKeyPath:@"managedObjectContext.persistentStoreCoordinator"];

    id store = nil;

    if ((defaultStoreURL != nil) && (coordinator != nil)) {

    store = [coordinator persistentStoreForURL:defaultStoreURL];

    }

    return store;

}

- (id)inMemoryStore:(InferenceCore *)core {

    id inMemoryStore = [core valueForKey:@"inMemoryStore"];

    NSPersistentStoreCoordinator *coordinator = [core inferredValueForKeyPath:@"managedObjectContext.persistentStoreCoordinator"];

    if ((inMemoryStore == nil) && (coordinator != nil)) {

        inMemoryStore = [coordinator addPersistentStoreWithType:NSInMemoryStoreType configuration:nil URL:nil options:nil error:nil];

        [core setValue:inMemoryStore forKey:@"inMemoryStore"];

    }

    return inMemoryStore;

}

@end