DynamicModel.m

//
//  MOPModel.m
//  MormonPanus
//
//  Created by Dalton Claybrook on 8/29/14.
//  Copyright (c) 2014 Space Factory Studios. All rights reserved.
//

#import "MOPModel.h"
#import <objc/runtime.h>

@implementation MOPModel

#pragma mark - Initializers

+ (NSArray *)modelsFromCloudModels:(NSArray *)models
{
    NSMutableArray *newModels = [NSMutableArray arrayWithCapacity:models.count];
    for (id<MOPCloudModel> model in models)
    {
        MOPModel *newModel = [[self alloc] initWithCloudModel:model];
        [newModels addObject:newModel];
    }
    return [newModels copy];
}

- (instancetype)initWithCloudModel:(id<MOPCloudModel>)model
{
    self = [super init];
    if (self)
    {
        [self updateValuesWithModel:model];
    }
    return self;
}

#pragma mark - NSObject

- (void)setValue:(id)value forUndefinedKey:(NSString *)key
{
    // no-op. prevents exceptions.
    NSLog(@"key: %@ does not exist. value: %@", key, value);
}

#pragma mark - Public

- (NSString *)modifiedKeyForKey:(NSString *)key
{
    return key;
}

#pragma mark - Private

- (void)updateValuesWithModel:(id<MOPCloudModel>)model
{
    for (NSString *key in [model allKeys])
    {
        NSString *modKey = [self modifiedKeyForKey:key];
        id value = model[key];
        if ([self propertyTypeMatchesForKey:modKey value:value])
        {
            [self setValue:value forKey:modKey];
        }
    }
}

- (BOOL)propertyTypeMatchesForKey:(NSString *)key value:(id)value
{
    BOOL matches = NO;
    objc_property_t property = class_getProperty([self class], [key cStringUsingEncoding:NSASCIIStringEncoding]);
    if (property != NULL)
    {
        const char *attr = property_getAttributes(property);
        NSString *attrString = [NSString stringWithCString:attr encoding:NSASCIIStringEncoding];
        NSArray *components = [attrString componentsSeparatedByString:@","];
        for (NSString *component in components)
        {
            if (component.length > 1 && [[component substringToIndex:1] isEqualToString:@"T"])
            {
                NSScanner *scanner = [NSScanner scannerWithString:component];
                [scanner scanUpToString:@"\"" intoString:NULL];
                [scanner scanString:@"\"" intoString:NULL];
                
                NSString *pName = nil;
                [scanner scanUpToString:@"\"" intoString:&pName];
                
                Class class = NSClassFromString(pName);
                if (class && [value isKindOfClass:class])
                {
                    matches = YES;
                }
                break;
            }
        }
    }
    
    return matches;
}

@end