//
//  RQCommonCollectionViewController.m
//  YueXueChe
//
//  Created by 张嵘 on 2018/12/19.
//  Copyright © 2018 lee. All rights reserved.
//

#import "RQCommonCollectionViewController.h"
#import "RQCommonCollectionViewCell.h"
#import "RQCommonReusableView.h"

@interface RQCommonCollectionViewController ()
/// viewModel
@property (nonatomic, readwrite, strong) RQCommonCollectionViewModel *viewModel;
@end

@implementation RQCommonCollectionViewController
@dynamic viewModel;

- (void)viewDidLoad {
	[super viewDidLoad];
}

#pragma mark - Override
- (void)bindViewModel {
	[super bindViewModel];
}

- (UIEdgeInsets)contentInset {
	return UIEdgeInsetsMake((RQ_APPLICATION_NAV_BAR_HEIGHT + RQ_APPLICATION_STATUS_BAR_HEIGHT), 0, 0, 0);
}

- (void)configureCell:(RQCommonCollectionViewCell *)cell atIndexPath:(NSIndexPath *)indexPath withObject:(id)object {
	[cell bindViewModel:object];
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView dequeueReusableCellWithIdentifier:(NSString *)identifier forIndexPath:(NSIndexPath *)indexPath {
	return [RQCommonCollectionViewCell cellWithCollectionView:collectionView forIndexPath:indexPath];
}

#pragma mark - UICollectionViewDelegate & UICollectionViewDataSource
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
	return self.viewModel.dataSource.count;
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
	RQCommonGroupViewModel *groupViewModel = self.viewModel.dataSource[section];
	return groupViewModel.itemViewModels.count;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
	/// fetch cell
	RQCommonCollectionViewCell *cell = (RQCommonCollectionViewCell *)[self collectionView:collectionView dequeueReusableCellWithIdentifier:@"UICollectionViewCell" forIndexPath:indexPath];
	RQCommonGroupViewModel *groupViewModel = self.viewModel.dataSource[indexPath.section];
	id object = groupViewModel.itemViewModels[indexPath.row];
	/// bind model
	[self configureCell:cell atIndexPath:indexPath withObject:(id)object];
	[cell setIndexPath:indexPath rowsInSection:groupViewModel.itemViewModels.count];
	return cell;
}

- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath {
	// 如果是头视图
	if (kind == UICollectionElementKindSectionHeader) {
		RQCommonReusableView *headerView = [RQCommonReusableView reusableViewWithCollectionView:collectionView OfKind:kind forIndexPath:indexPath];
		RQCommonGroupViewModel *groupViewModel = self.viewModel.dataSource[indexPath.section];
		[headerView bindViewModel:groupViewModel];
		headerView.headerContentLabel.hidden = NO;
		headerView.footerContentLabel.hidden = YES;
		return headerView;
	}else {
		RQCommonReusableView *footerView = [RQCommonReusableView reusableViewWithCollectionView:collectionView OfKind:kind forIndexPath:indexPath];
		RQCommonGroupViewModel *groupViewModel = self.viewModel.dataSource[indexPath.section];
		[footerView bindViewModel:groupViewModel];
		footerView.headerContentLabel.hidden = YES;
		footerView.footerContentLabel.hidden = NO;
		return footerView;
	}
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
	RQCommonGroupViewModel *groupViewModel = self.viewModel.dataSource[indexPath.section];
	RQCommonCollectionItemViewModel *itemViewModel = groupViewModel.itemViewModels[indexPath.row];
	return itemViewModel.itemSize;
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section {
	RQCommonGroupViewModel *groupViewModel = self.viewModel.dataSource[section];
    if (groupViewModel.groupModel) {
        return CGSizeMake(RQ_SCREEN_WIDTH, groupViewModel.groupModel.headerHeight);
    } else {
        return CGSizeMake(RQ_SCREEN_WIDTH, groupViewModel.headerHeight);
    }
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section {
	RQCommonGroupViewModel *groupViewModel = self.viewModel.dataSource[section];
    if (groupViewModel.groupModel) {
        return CGSizeMake(RQ_SCREEN_WIDTH, groupViewModel.groupModel.footerHeight);
    } else {
        return CGSizeMake(RQ_SCREEN_WIDTH, groupViewModel.footerHeight);
    }
}


@end