//
//  SegmentViewController.m
//  CLSegment
//
//  Created by CL on 2018/4/9.
//  Copyright © 2018年 cl. All rights reserved.
//

#import "SegmentViewController.h"

#define HEADBTN_TAG              10000

@interface SegmentViewController ()

@property (nonatomic, strong) UIScrollView  *headerView;
@property (nonatomic, strong) UIScrollView  *mainScrollView;

@end

@implementation SegmentViewController

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

- (void)initSegment:(CGFloat)height
{
    [self addButtonInScrollHeader:_titleArray height:height];
    [self addContentViewScrollView:_subViewControllers height:height];
}

/*!
 *  @brief  根据传入的title数组新建button显示在顶部scrollView上
 *
 *  @param titleArray  title数组
 */
- (void)addButtonInScrollHeader:(NSArray *)titleArray height:(CGFloat)height
{
    self.headerView.frame = CGRectMake(0, height, SCREEN_WIDTH, self.buttonHeight);
    if (_segmentHeaderType == 0) {
        self.headerView.contentSize = CGSizeMake(self.buttonWidth * titleArray.count, self.buttonHeight);
    }
    else {
        self.headerView.contentSize = CGSizeMake(SCREEN_WIDTH, self.buttonHeight);
    }
    [self.view addSubview:self.headerView];
    
    for (NSInteger index = 0; index < titleArray.count; index++) {
        UIButton *segmentBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        segmentBtn.frame = CGRectMake(self.buttonWidth * index, 0, self.buttonWidth, self.buttonHeight);
        [segmentBtn setTitle:titleArray[index] forState:UIControlStateNormal];
        segmentBtn.titleLabel.font = [UIFont systemFontOfSize:self.fontSize];
        segmentBtn.tag = index + HEADBTN_TAG;
        [segmentBtn setTitleColor:self.titleColor forState:UIControlStateNormal];
        [segmentBtn setTitleColor:self.titleSelectedColor forState:UIControlStateSelected];
        [segmentBtn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
        [self.headerView addSubview:segmentBtn];
        if (index == 0) {
            segmentBtn.selected = YES;
            self.selectIndex = segmentBtn.tag;
        }
    }
}

/*!
 *  @brief  根据传入的viewController数组，将viewController的view添加到显示内容的scrollView
 *
 *  @param subViewControllers  viewController数组
 */
- (void)addContentViewScrollView:(NSArray *)subViewControllers height:(CGFloat)height
{
    _mainScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, self.buttonHeight + height , SCREEN_WIDTH, SCREEN_HEIGHT - height - self.buttonHeight)];
    _mainScrollView.contentSize = CGSizeMake(SCREEN_WIDTH * subViewControllers.count, SCREEN_HEIGHT - height - self.buttonHeight);
    [_mainScrollView setScrollEnabled:NO];
    
    [_mainScrollView setShowsVerticalScrollIndicator:NO];
    [_mainScrollView setShowsHorizontalScrollIndicator:NO];
    _mainScrollView.bounces = NO;
    
    [self.view addSubview:_mainScrollView];
    
    [subViewControllers enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop){
        
        UIViewController *viewController = (UIViewController *)_subViewControllers[idx];
        viewController.view.frame = CGRectMake(idx * SCREEN_WIDTH, 0, SCREEN_WIDTH, _mainScrollView.frame.size.height);
        
        [_mainScrollView addSubview:viewController.view];
        [self addChildViewController:viewController];
    }];
}

- (void)addParentController:(UIViewController *)viewController
{
    if ([viewController respondsToSelector:@selector(edgesForExtendedLayout)])
    {
        viewController.edgesForExtendedLayout = UIRectEdgeNone;
    }
    [viewController addChildViewController:self];
    [viewController.view addSubview:self.view];
}

#pragma mark 点击按钮方法

- (void)btnClick:(UIButton *)button
{
    [_mainScrollView scrollRectToVisible:CGRectMake((button.tag - HEADBTN_TAG) *SCREEN_WIDTH, 0, SCREEN_WIDTH, _mainScrollView.frame.size.height) animated:NO];
    [self didSelectSegmentIndex:button.tag];
}

/*!
 *  @brief  设置顶部选中button下方线条位置
 *
 *  @param index 第几个
 */
- (void)didSelectSegmentIndex:(NSInteger)index
{
    UIButton *btn = (UIButton *)[self.view viewWithTag:self.selectIndex];
    btn.selected = NO;
    self.selectIndex = index;
    UIButton *currentSelectBtn = (UIButton *)[self.view viewWithTag:index];
    currentSelectBtn.selected = YES;
}

#pragma mark - ScrollViewDelegate

//- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
//{
//    if (scrollView.contentOffset.x<=960) {
//        if (scrollView == _mainScrollView) {
//            float xx = scrollView.contentOffset.x * (_buttonWidth / SCREEN_WIDTH) - _buttonWidth;
//            [_headerView scrollRectToVisible:CGRectMake(xx, 0, SCREEN_WIDTH, _headerView.frame.size.height) animated:YES];
//            NSInteger currentIndex = scrollView.contentOffset.x / SCREEN_WIDTH;
//            [self didSelectSegmentIndex:currentIndex + HEADBTN_TAG];
//        }
//    }else{
//        [scrollView setScrollEnabled:NO];
//    }
//}
//
//- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView;
//{
//    float xx = scrollView.contentOffset.x * (_buttonWidth / SCREEN_WIDTH) - _buttonWidth;
//    [_headerView scrollRectToVisible:CGRectMake(xx, 0, SCREEN_WIDTH, _headerView.frame.size.height) animated:YES];
//}

#pragma mark - setter/getter
- (UIScrollView *)headerView
{
    if (_headerView == nil) {
        _headerView = [[UIScrollView alloc] init];
        [_headerView setShowsVerticalScrollIndicator:NO];
        [_headerView setShowsHorizontalScrollIndicator:NO];
        _headerView.bounces = NO;
        _headerView.backgroundColor = self.headViewBackgroundColor;
    }
    return _headerView;
}

- (UIColor *)headViewBackgroundColor
{
    if (_headViewBackgroundColor == nil) {
        _headViewBackgroundColor = UIColorHex(0xFFFFFF);
    }
    return _headViewBackgroundColor;
}

- (UIColor *)titleColor
{
    if (_titleColor == nil) {
        _titleColor = UIColorHex(0x0A0A0A);
    }
    return _titleColor;
}

- (UIColor *)titleSelectedColor
{
    if (_titleSelectedColor == nil) {
        _titleSelectedColor = UIColorHex(0x3979D3);
    }
    return _titleSelectedColor;
}

- (CGFloat)fontSize
{
    if (_fontSize == 0) {
        _fontSize = 15.f;
    }
    return _fontSize;
}

- (CGFloat)buttonWidth
{
    if (_buttonWidth == 0) {
        _buttonWidth = SCREEN_WIDTH / 4;
    }
    return _buttonWidth;
}

- (CGFloat)buttonHeight
{
    if (_buttonHeight == 0) {
        _buttonHeight = 50.f;
    }
    return _buttonHeight;
}

- (CGFloat)bottomLineHeight
{
    if (_bottomLineHeight == 0) {
        _bottomLineHeight = 1.f;
    }
    return _bottomLineHeight;
}

- (CGFloat)bottomCount
{
    if (_bottomCount == 0) {
        _bottomCount = 1;
    }
    return _bottomCount;
}

- (UIColor *)bottomLineColor
{
    if (_bottomLineColor == nil) {
        _bottomLineColor = [UIColor whiteColor];
    }
    return _bottomLineColor;
}

@end