//  ZJAddPhotosView.h
//  ROOMER
//
//  Created by 鄧志堅 on 2016/12/2.
//  Copyright ? 2016年 dzj. All rights reserved.


#import <UIKit/UIKit.h>
@interface ZJAddPhotosView : UIView
// 存儲所有的照片(UIImage)
@property (nonatomic, strong) NSMutableArray *images;
@end



//  ZJAddPhotosView.m
//  ROOMER
//
//  Created by 鄧志堅 on 2016/12/2.
//  Copyright ? 2016年 dzj. All rights reserved.
//

#import "ZJAddPhotosView.h"
#define kMaxColumn 3 // 每行顯示數量
#define MaxImageCount 9 // 最多顯示圖片個數
#define deleImageWH 25 // 刪除按鈕的寬高
#define kAdeleImage @"delectedBtn.png" // 刪除按鈕圖片
#define kAddImage @"addPhotos.png" // 添加按鈕圖片

@interface ZJAddPhotosView()<UIImagePickerControllerDelegate,UINavigationControllerDelegate>
{
    // 標識被編輯的按鈕 -1 為添加新的按鈕
    NSInteger editTag;
}
@end

@implementation ZJAddPhotosView
-(id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        UIButton *btn = [self createButtonWithImage:kAddImage andSeletor:@selector(addNew:)];
        btn.layer.borderWidth  = 2;
        btn.layer.borderColor = [UIColor grayColor].CGColor;
        [self addSubview:btn];
    }
    return self;
}

-(NSMutableArray *)images
{
    if (_images == nil) {
        _images = [NSMutableArray array];
    }
    return _images;
}
// 添加新的控件
-(void)addNew:(UIButton *)btn
{
    // 標識為添加一個新的圖片
    if (![self deleClose:btn]) {
        editTag = -1;
        [self callImagePicker];
    }    
}

// 修改舊的控件
-(void)changeOld:(UIButton *)btn
{
    // 標識為修改(tag為修改標識)
    if (![self deleClose:btn]) {
        editTag = btn.tag;
        [self callImagePicker];
    }
}
// 刪除"刪除按鈕"
-(BOOL)deleClose:(UIButton *)btn
{
    if (btn.subviews.count == 2) {
        [[btn.subviews lastObject] removeFromSuperview];
        [self stop:btn];
        return YES;
    }
    return NO;
}
// 調用圖片選擇器
-(void)callImagePicker
{
    UIImagePickerController *pc = [[UIImagePickerController alloc] init];
    pc.allowsEditing = YES;
    pc.delegate = self;
    [self.window.rootViewController presentViewController:pc animated:YES completion:nil];
}
// 根據圖片名稱或者圖片創建一個新的顯示控件
-(UIButton *)createButtonWithImage:(id)imageNameOrImage andSeletor : (SEL)selector
{
    UIImage *addImage = nil;
    if ([imageNameOrImage isKindOfClass:[NSString class]]) {
        addImage = [UIImage imageNamed:imageNameOrImage];
    }
    else if([imageNameOrImage isKindOfClass:[UIImage class]])
    {
        addImage = imageNameOrImage;
    }
    UIButton *addBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    [addBtn setImage:addImage forState:UIControlStateNormal];
    [addBtn addTarget:self action:selector forControlEvents:UIControlEventTouchUpInside];
    addBtn.tag = self.subviews.count;
    // 添加長按手勢,用作刪除.加號按鈕不添加
    if(addBtn.tag != 0)
    {
        UILongPressGestureRecognizer *gester = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
        [addBtn addGestureRecognizer:gester];
    }
    return addBtn; 
}
// 長按添加刪除按鈕
-(void)longPress : (UIGestureRecognizer *)gester
{
    if (gester.state == UIGestureRecognizerStateBegan)
    {
        UIButton *btn = (UIButton *)gester.view;
        UIButton *dele = [UIButton buttonWithType:UIButtonTypeCustom];
        dele.bounds = CGRectMake(0, 0, deleImageWH, deleImageWH);
        [dele setImage:[UIImage imageNamed:kAdeleImage] forState:UIControlStateNormal];
        [dele addTarget:self action:@selector(deletePic:) forControlEvents:UIControlEventTouchUpInside];
        dele.frame = CGRectMake(btn.frame.size.width - dele.frame.size.width, 0, dele.frame.size.width, dele.frame.size.height);
        [btn addSubview:dele];
        [self start : btn];
       }
   }

// 長按開始抖動
-(void)start : (UIButton *)btn {
    double angle1 = -5.0 / 180.0 * M_PI;
    double angle2 = 5.0 / 180.0 * M_PI;
    CAKeyframeAnimation *anim = [CAKeyframeAnimation animation];
    anim.keyPath = @"transform.rotation";
    anim.values = @[@(angle1),  @(angle2), @(angle1)];
    anim.duration = 0.25;
    // 動畫的重復執行次數
    anim.repeatCount = MAXFLOAT;
    // 保持動畫執行完畢后的狀態
    anim.removedOnCompletion = NO;
    anim.fillMode = kCAFillModeForwards;
    [btn.layer addAnimation:anim forKey:@"shake"];
}
// 停止抖動
-(void)stop : (UIButton *)btn{
    [btn.layer removeAnimationForKey:@"shake"];
}
// 刪除圖片
-(void)deletePic : (UIButton *)btn
{
    [self.images removeObject:[(UIButton *)btn.superview imageForState:UIControlStateNormal]];
    [btn.superview removeFromSuperview];
    if ([[self.subviews lastObject] isHidden]) {
        [[self.subviews lastObject] setHidden:NO];
    } 
}
// 對所有子控件進行布局
-(void)layoutSubviews
{
    [super layoutSubviews];
    NSInteger count = self.subviews.count;
    CGFloat margin = 10;
    CGFloat btnW = (ZJScreenW - (kMaxColumn + 1) * margin) / kMaxColumn;
    CGFloat btnH = btnW;
    int maxColumn = kMaxColumn > self.frame.size.width / btnW ? self.frame.size.width / btnW : kMaxColumn;
    CGFloat marginX = (self.frame.size.width - maxColumn * btnW) / (count + 1);
    CGFloat marginY = marginX;
    for (int i = 0; i < count; i++) {
        UIButton *btn = self.subviews[i];
        CGFloat btnX = (i % maxColumn) * (marginX + btnW) + marginX;
        CGFloat btnY = (i / maxColumn) * (marginY + btnH) + marginY;
        btn.frame = CGRectMake(btnX, btnY, btnW, btnH);
    } 
}
#pragma mark - UIImagePickerController 代理方法
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *image = info[UIImagePickerControllerEditedImage];
    if (editTag == -1) {
        // 創建一個新的控件
        UIButton *btn = [self createButtonWithImage:image andSeletor:@selector(changeOld:)];
        [self insertSubview:btn atIndex:self.subviews.count - 1];
        [self.images addObject:image];
        if (self.subviews.count - 1 == MaxImageCount) {
            [[self.subviews lastObject] setHidden:YES];
        }
    }
    else
    {
        // 根據tag修改需要編輯的控件
        UIButton *btn = (UIButton *)[self viewWithTag:editTag];
        NSInteger index = [self.images indexOfObject:[btn imageForState:UIControlStateNormal]];
        [self.images removeObjectAtIndex:index];
        [btn setImage:image forState:UIControlStateNormal];
        [self.images insertObject:image atIndex:index];
    }
    // 退出圖片選擇控制器
    [picker dismissViewControllerAnimated:YES completion:nil];
}
@end