//
//  ABGridView.h
//  GridView
//
//  Created by Akabeko on 2012/09/09.
//  Copyright (c) 2012 Akabeko. All rights reserved. Distributed under the MIT license.
//
//  Original author: Andrey Tarantsov, ATArrayView https://github.com/andreyvit/SoloComponents-iOS/tree/master/ATArrayView
//

#import <Foundation/Foundation.h>

@protocol ABGridViewDelegate;

////////////////////////////////////////////////////////////////////////////////
/**
 * コントロールをグリッド形式で配置するコンテナです。
 */
@interface ABGridView : UIView

@property(nonatomic,   assign) id<ABGridViewDelegate> delegate;         //! デリゲート
@property(nonatomic,   assign) UIEdgeInsets           contentInsets;    //!
@property(nonatomic,   assign) CGSize                 itemSize;         //! グリッド配置するアイテムのサイズ
@property(nonatomic,   assign) CGFloat                minimumColumnGap; //! 最小のカラム間の余白

- (void)reloadData;
- (UIView *)viewForItemAtIndex:(NSUInteger)index;
- (UIView *)dequeueReusableItem;
- (CGRect)rectForItemAtIndex:(NSUInteger)index;

@end

////////////////////////////////////////////////////////////////////////////////
/**
 * ABGridView に関するデリゲートです。
 */
@protocol ABGridViewDelegate <NSObject>

@required
- (NSInteger)numberOfItemsInGridView:(ABGridView *)gridView;
- (UIView *)viewForItemInGridView:(ABGridView *)gridView atIndex:(NSInteger)index;

@optional
- (void)gridView:(ABGridView *)gridView didSelectItemInGridView:(UIView *)view;

@end

/**
 * アイテム設定を更新します。
 *
 * @param item  アイテム
 * @param index インデックス。
 */
- (void)configureItem:(UIView *)item forIndex:(NSInteger)index
{
    item.tag   = index;
    item.frame = [self rectForItemAtIndex:index];

    if( [_delegate respondsToSelector:@selector(gridView:didSelectItemInGridView:)] )
    {
        // UIImageView などがアイテムでもタップ検出するため、常にユーザー操作を許可する
        item.userInteractionEnabled = YES;
        item.gestureRecognizers     = [NSArray arrayWithObjects:[[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapItem:)] autorelease], nil];
    }

    [item setNeedsDisplay]; // just in case
}

/**
 * アイテムがタップされた時に発生します。
 *
 * @param gestureRecognizer ジェスチャー情報。
 */
- (void)tapItem:(UIGestureRecognizer *)gestureRecognizer
{
    [_delegate gridView:self didSelectItemInGridView:gestureRecognizer.view];
}

/**
 * 指定されたインデックスのアイテムを取得します。
 *
 * @param gridView グリッド配置コンテナ。
 * @param index    インデックス。
 *
 * @return アイテム。
 */
- (UIView *)viewForItemInGridView:(ABGridView *)gridView atIndex:(NSInteger)index
{
    return ( self.isViewModeUIImage ?
            [self viewForItemInGridViewAtImageView:gridView atIndex:index] :
            [self viewForItemInGridViewAtOriginalCell:gridView atIndex:index] );
}

- (UIView *)viewForItemInGridViewAtImageView:(ABGridView *)gridView atIndex:(NSInteger)index
{
    UIImageView* item = ( UIImageView* )[gridView dequeueReusableItem];
    if( item == nil )
    {
        item = [[[UIImageView alloc] init] autorelease];
    }

    ALAsset* asset = [self.assets objectAtIndex:index];
    item.image = [UIImage imageWithCGImage:[asset thumbnail]];

    return item;
}

- (UIView *)viewForItemInGridViewAtOriginalCell:(ABGridView *)gridView atIndex:(NSInteger)index
{
    AssetCellView* item = ( AssetCellView* )[gridView dequeueReusableItem];
    if( item == nil )
    {
        AssetCellViewController* controller = [[[AssetCellViewController alloc] initWithNibName:@"AssetCellViewController" bundle:nil] autorelease];
        item = ( AssetCellView* )controller.view;
        [self addViewShadow:item];
    }

    ALAsset* asset = [self.assets objectAtIndex:index];
    item.index           = index;
    item.imageView.image = [UIImage imageWithCGImage:[asset thumbnail]];

    return item;
}

/**
 * アイテムが選択された時に発生します。
 *
 * @param gridView グリッド配置コンテナ。
 * @param view     アイテム。
 */
- (void)gridView:(ABGridView *)gridView didSelectItemInGridView:(UIView *)view
{
    const NSInteger index = ( self.isViewModeUIImage ? view.tag : ( ( AssetCellView* )view ).index );

    ALAsset* asset = [self.assets objectAtIndex:index];
    if( asset == nil ) { return; }

    ALAssetRepresentation* rep = [asset defaultRepresentation];
    UIImage* image  = [UIImage imageWithCGImage:[rep fullScreenImage] scale:[rep scale] orientation:( UIImageOrientation )[rep orientation]];

    // 戻るボタン
    UIBarButtonItem* back = [[[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStyleBordered target:nil action:nil] autorelease];
    self.navigationItem.backBarButtonItem = back;

    PhotoViewController* controller = [[[PhotoViewController alloc] initWithNibName:@"PhotoViewController" bundle:nil] autorelease];
    controller.image = image;

    [self.navigationController pushViewController:controller animated:YES];
}