//
//  SLImageClipController.m
//  DarkMode
//
//  Created by wsl on 2019/11/2.
//  Copyright © 2019 wsl. All rights reserved.
//

#import "SLImageClipController.h"
#import "SLImageZoomView.h"
#import "SLGridView.h"
#import "UIView+SLImage.h"

#define KBottomMenuHeight 100  //底部菜单高度
#define KGridTopMargin 40  //顶部间距
#define KGridBottomMargin 20  //底部间距
#define KGridLRMargin 20   //左右边距

@interface SLImageClipController ()<UIScrollViewDelegate, SLGridViewDelegate, SLImageZoomViewDelegate>

// 缩放视图
@property (nonatomic, strong) SLImageZoomView *zoomView;
//网格视图 裁剪框
@property (nonatomic, strong) SLGridView *gridView;

/// 原始位置区域
@property (nonatomic, assign) CGRect originalRect;
/// 最大裁剪区域
@property (nonatomic, assign) CGRect maxGridRect;

/// 裁剪区域
//@property (nonatomic, assign) CGRect clipRect;

/// 当前旋转角度
@property (nonatomic, assign) NSInteger rotateAngle;
/// 图像方向
@property (nonatomic, assign) UIImageOrientation imageOrientation;

@property (nonatomic, strong) UIButton *rotateBtn;  //旋转操作
@property (nonatomic, strong) UIButton *cancleClipBtn; //取消操作
@property (nonatomic, strong) UIButton *recoveryBtn; //还原
@property (nonatomic, strong) UIButton *doneClipBtn;  //保存操作
@end

@implementation SLImageClipController

#pragma mark - Override
- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor blackColor];
    [self setupUI];
}
- (BOOL)prefersStatusBarHidden {
    return YES;
}
- (void)dealloc {
    NSLog(@"图片裁剪视图释放了");
}
#pragma mark - UI
- (void)setupUI {
    self.zoomView.image = self.image;
    self.maxGridRect = CGRectMake(KGridLRMargin, KGridTopMargin, self.view.sl_width - KGridLRMargin * 2, self.view.sl_height - KGridTopMargin - KGridBottomMargin- KBottomMenuHeight);
    
    CGSize newSize = CGSizeMake(self.view.sl_width - 2 * KGridLRMargin, (self.view.sl_width - 2 * KGridLRMargin)*self.image.size.height/self.image.size.width);
    if (newSize.height > self.maxGridRect.size.height) {
        newSize = CGSizeMake(self.maxGridRect.size.height*self.image.size.width/self.image.size.height, self.maxGridRect.size.height);
        self.zoomView.sl_size = newSize;
        self.zoomView.sl_y = KGridTopMargin;
        self.zoomView.sl_centerX = self.view.sl_width/2.0;
    }else {
        self.zoomView.sl_size = newSize;
        self.zoomView.center = CGPointMake(self.view.sl_width/2.0, (self.view.sl_height - KBottomMenuHeight)/2.0);
    }
    
    [self.view addSubview:self.zoomView];
    self.zoomView.imageView.frame = self.zoomView.bounds;
    self.originalRect = self.zoomView.frame;
    self.gridView.gridRect = self.zoomView.frame;
    self.gridView.maxGridRect = self.maxGridRect;
    [self.view addSubview:self.gridView];
    
    [self.view addSubview:self.rotateBtn];
    [self.view addSubview:self.cancleClipBtn];
    [self.view addSubview:self.recoveryBtn];
    [self.view addSubview:self.doneClipBtn];
}

#pragma mark - Getter
- (SLImageZoomView *)zoomView {
    if (!_zoomView) {
        _zoomView = [[SLImageZoomView alloc] initWithFrame:CGRectMake(KGridLRMargin, KGridTopMargin, self.view.sl_width - KGridLRMargin *2,( self.view.sl_width - KGridLRMargin *2)*self.image.size.height/self.image.size.width)];
        _zoomView.sl_centerY = (self.view.sl_height - KBottomMenuHeight)/2.0;
        _zoomView.backgroundColor = [UIColor blackColor];
        _zoomView.zoomViewDelegate = self;
    }
    return _zoomView;
}
- (SLGridView *)gridView {
    if (!_gridView) {
        _gridView = [[SLGridView alloc] initWithFrame:self.view.bounds];
        _gridView.delegate = self;
    }
    return _gridView;
}
- (UIButton *)rotateBtn {
    if (_rotateBtn == nil) {
        _rotateBtn = [[UIButton alloc] initWithFrame:CGRectMake(30, self.view.sl_height - KBottomMenuHeight, 40, 30)];
        [_rotateBtn setTitle:@"旋转" forState:UIControlStateNormal];
        [_rotateBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        _rotateBtn.titleLabel.font = [UIFont boldSystemFontOfSize:16];
        [_rotateBtn addTarget:self action:@selector(rotateBtnClicked:) forControlEvents:UIControlEventTouchUpInside];
    }
    return _rotateBtn;
}
- (UIButton *)cancleClipBtn {
    if (_cancleClipBtn == nil) {
        _cancleClipBtn = [[UIButton alloc] initWithFrame:CGRectMake(30, self.view.sl_height - 30 - 20, 40, 30)];
        [_cancleClipBtn setImage:[UIImage imageNamed:@"EditImageClipCancel"] forState:UIControlStateNormal];
        _cancleClipBtn.titleLabel.font = [UIFont systemFontOfSize:14];
        [_cancleClipBtn addTarget:self action:@selector(cancleClipClicked:) forControlEvents:UIControlEventTouchUpInside];
    }
    return _cancleClipBtn;
}
- (UIButton *)recoveryBtn {
    if (_recoveryBtn == nil) {
        _recoveryBtn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 40, 30)];
        _recoveryBtn.sl_centerX = self.view.sl_width/2.0;
        _recoveryBtn.sl_centerY = self.cancleClipBtn.center.y;
        [_recoveryBtn setTitle:@"还原" forState:UIControlStateNormal];
        [_recoveryBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        _recoveryBtn.titleLabel.font = [UIFont boldSystemFontOfSize:16];
        [_recoveryBtn addTarget:self action:@selector(recoveryClicked:) forControlEvents:UIControlEventTouchUpInside];
    }
    return _recoveryBtn;
}
- (UIButton *)doneClipBtn {
    if (_doneClipBtn == nil) {
        _doneClipBtn = [[UIButton alloc] initWithFrame:CGRectMake(self.view.sl_width - 30 - 40, self.view.sl_height - 30 - 20, 40, 30)];
        [_doneClipBtn setImage:[UIImage imageNamed:@"EditImageClipDone"] forState:UIControlStateNormal];
        [_doneClipBtn addTarget:self action:@selector(doneClipClicked:) forControlEvents:UIControlEventTouchUpInside];
    }
    return _doneClipBtn;
}
/// 返回图像方向
- (UIImageOrientation)imageOrientation {
    UIImageOrientation orientation = UIImageOrientationUp;
    switch (_rotateAngle) {
        case 90:
        case -270:
            orientation = UIImageOrientationRight;
            break;
        case -90:
        case 270:
            orientation = UIImageOrientationLeft;
            break;
        case 180:
        case -180:
            orientation = UIImageOrientationDown;
            break;
        default:
            break;
    }
    _imageOrientation = orientation;
    return orientation;
}
#pragma mark - HelpMethods
// 放大zoomView区域到指定网格gridRect区域
- (void)zoomInToRect:(CGRect)gridRect{
    // 正在拖拽或减速
    if (self.zoomView.dragging || self.zoomView.decelerating) {
        return;
    }
    
    CGRect imageRect = [self.zoomView convertRect:self.zoomView.imageView.frame toView:self.view];
    //当网格往图片边缘(x/y轴方向)移动即将出图片边界时，调整self.zoomView.contentOffset和缩放zoomView大小，把网格外的图片区域逐步移到网格内
    if (!CGRectContainsRect(imageRect,gridRect)) {
        CGPoint contentOffset = self.zoomView.contentOffset;
        if (self.imageOrientation == UIImageOrientationRight) {
            if (CGRectGetMaxX(gridRect) > CGRectGetMaxX(imageRect)) contentOffset.y = 0;
            if (CGRectGetMinY(gridRect) < CGRectGetMinY(imageRect)) contentOffset.x = 0;
        }
        if (self.imageOrientation == UIImageOrientationLeft) {
            if (CGRectGetMinX(gridRect) < CGRectGetMinX(imageRect)) contentOffset.y = 0;
            if (CGRectGetMaxY(gridRect) > CGRectGetMaxY(imageRect)) contentOffset.x = 0;
        }
        if (self.imageOrientation == UIImageOrientationUp) {
            if (CGRectGetMinY(gridRect) < CGRectGetMinY(imageRect)) contentOffset.y = 0;
            if (CGRectGetMinX(gridRect) < CGRectGetMinX(imageRect)) contentOffset.x = 0;
        }
        if (self.imageOrientation == UIImageOrientationDown) {
            if (CGRectGetMaxY(gridRect) > CGRectGetMaxY(imageRect)) contentOffset.y = 0;
            if (CGRectGetMaxX(gridRect) > CGRectGetMaxX(imageRect)) contentOffset.x = 0;
        }
        self.zoomView.contentOffset = contentOffset;
        
        /** 取最大值缩放 */
        CGRect myFrame = self.zoomView.frame;
        myFrame.origin.x = MIN(myFrame.origin.x, gridRect.origin.x);
        myFrame.origin.y = MIN(myFrame.origin.y, gridRect.origin.y);
        myFrame.size.width = MAX(myFrame.size.width, gridRect.size.width);
        myFrame.size.height = MAX(myFrame.size.height, gridRect.size.height);
        self.zoomView.frame = myFrame;
        
        [self resetMinimumZoomScale];
        [self.zoomView setZoomScale:self.zoomView.zoomScale];
    }
}
//重置最小缩放系数  只要改变了zoomView大小就重置
- (void)resetMinimumZoomScale {
    CGRect rotateoriginalRect = CGRectApplyAffineTransform(self.originalRect, self.zoomView.transform);
    if (CGSizeEqualToSize(rotateoriginalRect.size, CGSizeZero)) {
        /** size为0时候不能继续，否则minimumZoomScale=+Inf，会无法缩放 */
        return;
    }
    //设置最小缩放系数
    CGFloat zoomScale = MAX(CGRectGetWidth(self.zoomView.frame) / CGRectGetWidth(rotateoriginalRect), CGRectGetHeight(self.zoomView.frame) / CGRectGetHeight(rotateoriginalRect));
    self.zoomView.minimumZoomScale = zoomScale;
}
//获取网格区域在图片上的相对位置
- (CGRect)rectOfGridOnImageByGridRect:(CGRect)cropRect {
    CGRect rect = [self.view convertRect:cropRect toView:self.zoomView.imageView];
    return rect;
}
//保存图片完成后调用的方法
- (void)savedPhotoImage:(UIImage*)image didFinishSavingWithError:(NSError *)error contextInfo: (void *)contextInfo {
    if (error) {
        NSLog(@"保存图片出错%@", error.localizedDescription);
    } else {
        NSLog(@"保存图片成功");
    }
}
#pragma mark - EventsHandle
- (void)rotateBtnClicked:(id)sender {
    _rotateAngle = (_rotateAngle+=90)%360;
    CGFloat angleInRadians = 0.0f;
    switch (_rotateAngle) {
        case 90:    angleInRadians = M_PI_2;            break;
        case -90:   angleInRadians = -M_PI_2;           break;
        case 180:   angleInRadians = M_PI;              break;
        case -180:  angleInRadians = -M_PI;             break;
        case 270:   angleInRadians = (M_PI + M_PI_2);   break;
        case -270:  angleInRadians = -(M_PI + M_PI_2);  break;
        default:                                        break;
    }
    //旋转前获得网格框在图片上选择的区域
    CGRect gridRectOfImage = [self rectOfGridOnImageByGridRect:self.gridView.gridRect];
    
    /// 旋转变形
    CGAffineTransform transform = CGAffineTransformRotate(CGAffineTransformIdentity, angleInRadians);
    self.zoomView.transform = transform;
    //transform后，bounds不会变，frame会变
    CGFloat width = CGRectGetWidth(self.zoomView.frame);
    CGFloat height = CGRectGetHeight(self.zoomView.frame);
    //计算旋转之后
    CGSize newSize = CGSizeMake(self.view.sl_width - 2 * KGridLRMargin, (self.view.sl_width - 2 * KGridLRMargin)*height/width);
    if (newSize.height > self.gridView.maxGridRect.size.height) {
        newSize = CGSizeMake(self.gridView.maxGridRect.size.height*width/height, self.gridView.maxGridRect.size.height);
        self.zoomView.sl_size = newSize;
        self.zoomView.sl_y = KGridTopMargin;
        self.zoomView.sl_centerX = self.view.sl_width/2.0;
    }else {
        self.zoomView.sl_size = newSize;
        self.zoomView.center = CGPointMake(self.view.sl_width/2.0, (self.view.sl_height - KBottomMenuHeight)/2.0);
    }
    self.gridView.gridRect = self.zoomView.frame;
    
    //重置最小缩放系数
    [self resetMinimumZoomScale];
    CGFloat scale = MIN(CGRectGetWidth(self.zoomView.frame) / width, CGRectGetHeight(self.zoomView.frame) / height);
    [self.zoomView setZoomScale:self.zoomView.zoomScale * scale];
    // 调整contentOffset
    self.zoomView.contentOffset = CGPointMake(gridRectOfImage.origin.x*self.zoomView.zoomScale, gridRectOfImage.origin.y*self.zoomView.zoomScale);
}
- (void)cancleClipClicked:(id)sender {
    [self dismissViewControllerAnimated:NO completion:nil];
}
//还原
- (void)recoveryClicked:(id)sender {
    self.zoomView.minimumZoomScale = 1;
    self.zoomView.zoomScale = 1;
    self.zoomView.transform = CGAffineTransformIdentity;
    self.zoomView.frame = self.originalRect;
    self.gridView.gridRect = self.zoomView.frame;
    _rotateAngle = 0;
}
//完成编辑
- (void)doneClipClicked:(id)sender {
    [self dismissViewControllerAnimated:NO completion:nil];
    UIImage *clipImage = [self.zoomView.imageView sl_imageByViewInRect:[self rectOfGridOnImageByGridRect:_gridView.gridRect]];
    UIImage *roImage = [UIImage imageWithCGImage:clipImage.CGImage scale:[UIScreen mainScreen].scale orientation:self.imageOrientation];
    [[NSNotificationCenter defaultCenter] postNotificationName:@"sl_ImageClippingComplete" object:nil userInfo:@{@"image" : roImage}];
}

#pragma mark - SLGridViewDelegate
//开始调整
- (void)gridViewDidBeginResizing:(SLGridView *)gridView {
    CGPoint contentOffset = self.zoomView.contentOffset;
    if (self.zoomView.contentOffset.x < 0) contentOffset.x = 0;
    if (self.zoomView.contentOffset.y < 0) contentOffset.y = 0;
    [self.zoomView setContentOffset:contentOffset animated:NO];
}
//正在调整
- (void)gridViewDidResizing:(SLGridView *)gridView {
    //放大到 >= gridRect
    [self zoomInToRect:gridView.gridRect];
}
// 结束调整
- (void)gridViewDidEndResizing:(SLGridView *)gridView {
    CGRect gridRectOfImage = [self rectOfGridOnImageByGridRect:gridView.gridRect];
    //居中
    [UIView animateWithDuration:0.25
                          delay:0.0
                        options:UIViewAnimationOptionBeginFromCurrentState
                     animations:^{
        CGSize newSize = CGSizeMake(self.view.sl_width - 2 * KGridLRMargin, (self.view.sl_width - 2 * KGridLRMargin)*gridView.gridRect.size.height/gridView.gridRect.size.width);
        if (newSize.height > self.gridView.maxGridRect.size.height) {
            newSize = CGSizeMake(self.gridView.maxGridRect.size.height*gridView.gridRect.size.width/gridView.gridRect.size.height, self.gridView.maxGridRect.size.height);
            self.zoomView.sl_size = newSize;
            self.zoomView.sl_y = KGridTopMargin;
            self.zoomView.sl_centerX = self.view.sl_width/2.0;
        }else {
            self.zoomView.sl_size = newSize;
            self.zoomView.center = CGPointMake(self.view.sl_width/2.0, (self.view.sl_height - KBottomMenuHeight)/2.0);
        }
        //重置最小缩放系数
        [self resetMinimumZoomScale];
        [self.zoomView setZoomScale:self.zoomView.zoomScale];
        // 调整contentOffset
        CGFloat zoomScale = self.zoomView.sl_width/gridView.gridRect.size.width;
        gridView.gridRect = self.zoomView.frame;
        [self.zoomView setZoomScale:self.zoomView.zoomScale * zoomScale];
        self.zoomView.contentOffset = CGPointMake(gridRectOfImage.origin.x*self.zoomView.zoomScale, gridRectOfImage.origin.y*self.zoomView.zoomScale);
    } completion:^(BOOL finished) {
        
    }];
}

#pragma mark - SLZoomViewDelegate
- (void)zoomViewDidBeginMoveImage:(SLImageZoomView *)zoomView {
    self.gridView.showMaskLayer = NO;
}
- (void)zoomViewDidEndMoveImage:(SLImageZoomView *)zoomView {
    self.gridView.showMaskLayer = YES;
}

@end