//
//  LianXianComponentsView.m
//  LianxianDemo
//
//  Created by 夏遠全 on 2018/2/6.
//  Copyright © 2018年 beijing. All rights reserved.
//

#import "LianXianComponentsView.h"
#import "LianxianDrawView.h"
#import "LianXianHeader.h"

@interface LianXianComponentsView() {
    NSMutableArray *_leftBtns;
    NSMutableArray 
 
*_rightBtns;
    UIButton       *currentLeftBtn;
    CGFloat        borderWith;
}

@end

@implementation LianXianComponentsView

//對進行重寫，以便在檢視初始化的時候建立並設定自定義的Context
- (id)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        [self setupDefalutValue];
    }
    return self;
}

 
//設定預設值
- (void)setupDefalutValue{
    
    self.backgroundColor = [UIColor clearColor];
    borderWith = 2.5;
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(restStatus:) name:kClearAllLineNotification object:nil];
}


//接收模型
-(void)setLianxianModel:(LianXianModel *)lianxianModel{
    
    _lianxianModel 
 
= lianxianModel;
    [self setupLianXianUnit];
    
    if (lianxianModel && lianxianModel.relationships.count>0) {
        [self showLianXianResult];
    }
    else{
        [self listClickLeftButton];
    }
}

//繪製連線選項
- (void)setupLianXianUnit{
    
    _leftBtns  = [[NSMutableArray array] init];
    _rightBtns = [[NSMutableArray array] init];

    CGFloat kWidth   = self.frame.size.width;
    CGFloat kHeight  = self.frame.size.height;
    CGFloat LY = (kHeight-(BHeight+Lpadding)*(self.lianxianModel.questions.count-1) - BHeight)/2;
    CGFloat RY = (kHeight-(BHeight+Rpadding)*(self.lianxianModel.options.count-1) - BHeight)/2;
    
    for (NSInteger i =0; i < self.lianxianModel.questions.count; i++) {
        UIButton *btn = [self createButtonWithFrame:CGRectMake(margin, LY+(BHeight+Lpadding)*i, BWidth, BHeight) title:[NSString stringWithFormat:@"%@",self.lianxianModel.questions[i]] tag:i];
        [self addSubview:btn];
        [_leftBtns addObject:btn];
    }
    
    for (NSInteger i =0; i< self.lianxianModel.options.count; i++) {
        UIButton *btn = [self createButtonWithFrame:CGRectMake(kWidth-margin-BWidth, RY+(BHeight+Rpadding)*i, BWidth, BHeight) title:[NSString stringWithFormat:@"%@",self.lianxianModel.options[i]] tag:i];
        [self addSubview:btn];
        [_rightBtns addObject:btn];
    }
}


-(UIButton *)createButtonWithFrame:(CGRect)frame title:(NSString *)title tag:(NSInteger)tag{
    
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.frame = frame;
    btn.layer.cornerRadius = 5.0;
    btn.layer.borderColor = [UIColor lightGrayColor].CGColor;
    btn.layer.borderWidth = borderWith;
    btn.layer.masksToBounds = YES;
    btn.tag = tag;
    
    [btn setBackgroundImage:[self imageWithColor:[UIColor whiteColor]] forState:UIControlStateNormal];
    [btn setBackgroundImage:[self imageWithColor:[UIColor colorWithRed:138/255.0 green:193/255.0 blue:211/255.0 alpha:1]] forState:UIControlStateHighlighted];
    [btn setBackgroundImage:[self imageWithColor:[UIColor colorWithRed:138/255.0 green:193/255.0 blue:211/255.0 alpha:1]] forState:UIControlStateSelected];
    
    [btn addTarget:self action:@selector(tapBtn:) forControlEvents:UIControlEventTouchUpInside];
    [btn setTitle:title forState:UIControlStateNormal];
    [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    
    return btn;
}


- (UIImage *)imageWithColor:(UIColor *)color
{
    CGFloat imageW = 20;
    CGFloat imageH = 20;
    UIGraphicsBeginImageContextWithOptions(CGSizeMake(imageW, imageH), NO, 0.0);
    [color set];
    UIRectFill(CGRectMake(0, 0, imageW, imageH));
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}


-(void)tapBtn:(UIButton *)btn{
    
    //判斷左邊按鈕是否處於選擇狀態，只有首先左邊處於此狀態下，右邊的按鈕點選才能進行連線操作（當前僅支援單向連線）
    if ([_rightBtns containsObject:btn]) {
        BOOL isLeftBtnSelected = NO;
        for (UIButton *leftBtn in _leftBtns) {
            if (leftBtn.selected) {
                isLeftBtnSelected = YES;
                break;
            }
        }
        if (!isLeftBtnSelected) {
            return;
        }
    }
    
    if ([_leftBtns containsObject:btn]) {
    
        //設定連線起點
        currentLeftBtn.selected = NO;
        currentLeftBtn.layer.borderColor = [UIColor lightGrayColor].CGColor;
        btn.selected = YES;
        currentLeftBtn = btn;
        currentLeftBtn.layer.borderColor = [UIColor colorWithRed:32/255.0 green:199/255.0 blue:251/255.0 alpha:1].CGColor;
        
        //設定終點按鈕可以選中狀態
        for (UIButton *rightBtn in _rightBtns) {
            rightBtn.layer.borderColor = [UIColor colorWithRed:32/255.0 green:199/255.0 blue:251/255.0 alpha:1].CGColor;
        }
        
        //傳送起點通知
        [[NSNotificationCenter defaultCenter] postNotificationName:kBeginPositionNotification object:[NSValue valueWithCGRect:btn.frame]];
    }
    
    
    if ([_rightBtns containsObject:btn]) {
        
        for (UIButton *leftBtn in _leftBtns) {
            if (leftBtn.selected) {
                
                //傳送終點通知
                [[NSNotificationCenter defaultCenter] postNotificationName:kEndPositionNotification object:[NSValue valueWithCGRect:btn.frame]];
                
                //自動設定起始選擇按鈕
                [self listClickLeftButton];
                
                break;
            }
        }
    }
}

//自動設定起始選擇按鈕
- (void)listClickLeftButton{
    
    if (!currentLeftBtn) {
        [self tapBtn:_leftBtns[0]];
        return;
    }
    
    NSUInteger tag = currentLeftBtn.tag;
    if (tag < _leftBtns.count-1) {  //自動下移
        [self tapBtn:_leftBtns[tag+1]];
    }
    else{
        [self tapBtn:_leftBtns[0]]; //重新開始
    }
}

//繪製預設已經連線的選項，此處僅僅做成績預覽使用，不能再編輯
- (void)showLianXianResult{
    
    for (UIButton *leftBtn in _leftBtns) {
        leftBtn.layer.borderColor = [UIColor lightGrayColor].CGColor;
        leftBtn.selected = leftBtn.userInteractionEnabled = NO;
    }
    
    for (UIButton *rightBtn in _rightBtns) {
        rightBtn.layer.borderColor = [UIColor lightGrayColor].CGColor;
        rightBtn.selected = rightBtn.userInteractionEnabled = NO;
    }
    
    if (self.lianxianModel.relationships.count == 0) {
        return;
    }
    
    NSMutableArray *relationslineArray = [NSMutableArray array];
    
    for (NSString *result in self.lianxianModel.relationships) {
        
        NSString *question = [[result componentsSeparatedByString:@"-"] firstObject];
        NSString *option   = [[result componentsSeparatedByString:@"-"] lastObject];
        NSMutableArray *pointArray = [NSMutableArray array];
        
        for (UIButton *leftBtn in _leftBtns) {

            if ([leftBtn.currentTitle isEqualToString:question]) {
                CGPoint startPoint = CGPointMake(CGRectGetMaxX(leftBtn.frame), CGRectGetMidY(leftBtn.frame));
                NSString *startPointString = NSStringFromCGPoint(startPoint);
                [pointArray addObject:startPointString];
                break;
            }
        }

        for (UIButton *rightBtn in _rightBtns) {

            if ([rightBtn.currentTitle isEqualToString:option]) {
                CGPoint endPoint = CGPointMake(CGRectGetMinX(rightBtn.frame), CGRectGetMidY(rightBtn.frame));
                NSString *endPointString = NSStringFromCGPoint(endPoint);
                [pointArray addObject:endPointString];
                break;
            }
        }
    
        [relationslineArray addObject:pointArray];
    }
    
    if (relationslineArray.count > 0) {
        [[NSNotificationCenter defaultCenter] postNotificationName:kFreshDrawLineNotification object:relationslineArray];
    }
}


//重置初始狀態
- (void)restStatus:(NSNotification *)notification{
    
    for (UIButton *leftBtn in _leftBtns) {
        leftBtn.selected = NO;
        leftBtn.layer.borderColor = [UIColor lightGrayColor].CGColor;
        [self tapBtn:_leftBtns[0]]; //重新開始
    }
}

@end