duoshoubang/FirstLink/Compoments/首页模块/发现页面/ViewModel/FKExploreVie...

//
//  FKExploreViewModel.m
//  FirstLink
//
//  Created by ascii on 16/2/16.
//  Copyright © 2016年 FirstLink. All rights reserved.
//

#import "FKExploreViewModel.h"
#import "FKExploreTopicTag.h"

int const FKExploreRequestPageSize      = 6;
NSString * const FKExploreTopicTagKey   = @"FKExploreTopicTagKey";

int const FKExploreRequestTopicTags         = 100;
int const FKExploreRequestTopicList         = 200;
int const FKExploreRequestTopicListNextPage = 300;

@implementation FKExploreViewModel

- (NSString *)topicTagIDAtIndex:(NSInteger)index {
    if (index < self.topicTagArray.count) {
        return ((FKExploreTopicTag *)self.topicTagArray[index]).tagID;
    }
    return nil;
}

- (NSString *)startRowWithTagID:(NSString *)tagID {
    if (tagID) {
        NSArray *topicArray = self.topicListCache[tagID];
        return [NSString stringWithFormat:@"%lu", (unsigned long)topicArray.count];
    }
    return nil;
}

- (NSArray *)validTopicListWithTagID:(NSString *)tagID {
    if (tagID) {
        NSArray *topicArray = self.topicListCache[tagID];
        NSMutableArray *validArray = [NSMutableArray array];
        [topicArray enumerateObjectsUsingBlock:^(FKExploreTopicListItem *obj, NSUInteger idx, BOOL * _Nonnull stop) {
            if (obj.subItemArray.count > 0) {
                [validArray addObject:obj];
            }
        }];
        return validArray;
    }
    return nil;
}

- (FKExploreTopicListItem *)validTopicListItemWithTagID:(NSString *)tagID atIndex:(NSInteger)index {
    NSArray *array = [self validTopicListWithTagID:tagID];
    if (index < array.count) {
        return array[index];
    }
    return nil;
}

- (void)setContentOffset:(CGFloat)offsetX forKey:(NSInteger)key {
    if (!_contensOffsetArray) {
        _contensOffsetArray = [NSMutableDictionary dictionary];
    }
    
    NSNumber *number = [NSNumber numberWithFloat:offsetX];
    NSString *keySring = [NSString stringWithFormat:@"%ld",(long)key];
    [self.contensOffsetArray setValue:number forKey:keySring];
}

- (CGFloat)contentOffsetForKey:(NSInteger)key {
    NSString *keySring = [NSString stringWithFormat:@"%ld",(long)key];
    NSNumber *value = [self.contensOffsetArray valueForKey:keySring];
    if ([value isKindOfClass:[NSNumber class]]) {
        return value.floatValue;
    }
    return 0;
}


#pragma mark - Property

- (NSArray *)topicTagArray {
    if (!_topicTagArray) {
        _topicTagArray = [NSArray array];
    }
    return _topicTagArray;
}

- (NSArray *)sectionTitlesArray {
    NSMutableArray *array = [NSMutableArray array];
    for (FKExploreTopicTag *tag in self.topicTagArray) {
        [array addObject:tag.name];
    }
    return array;
}

- (NSMutableDictionary *)topicListCache {
    if (!_topicListCache) {
        _topicListCache = [NSMutableDictionary dictionary];
    }
    return _topicListCache;
}

@end