/// 控制元件高度
#define kSearchBarH  44
#define kBottomViewH 44

/// 螢幕大小尺寸
#define kScreenWidth  [UIScreen mainScreen].bounds.size.width
#define kScreenHeight [UIScreen mainScreen].bounds.size.height

#import "ViewController.h"
#import <WebKit/WebKit.h>


@interface ViewController () <UISearchBarDelegate, WKNavigationDelegate>

@property (nonatomic, strong) UISearchBar 
 
*searchBar;
/// 網頁控制導航欄
@property (weak, nonatomic) UIView *bottomView;

@property (nonatomic, strong) WKWebView *wkWebView;

@property (weak, nonatomic) UIButton *backBtn;
@property (weak, nonatomic) UIButton *forwardBtn;
@property (weak, nonatomic) UIButton *reloadBtn;
@property (weak, nonatomic) UIButton 
 
*browserBtn;

@property (weak, nonatomic) NSString *baseURLString;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
//    [self simpleExampleTest];
    
    [self addSubViews];
    [self refreshBottomButtonState];
    
    [self.wkWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:
 
@"http://www.cnblogs.com/mddblog/"]]];
    
}
- (void)simpleExampleTest {
    // 1.建立webview，並設定大小，"20"為狀態列高度
    WKWebView *webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height - 20)];
    // 2.建立請求
    NSMutableURLRequest *request =[NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.cnblogs.com/mddblog/"]];
//    // 3.載入網頁
    [webView loadRequest:request];
//    [webView loadFileURL:[NSURL fileURLWithPath:@"/Users/userName/Desktop/bigIcon.png"] allowingReadAccessToURL:[NSURL fileURLWithPath:@"/Users/userName/Desktop/bigIcon.png"]];
    // 最後將webView新增到介面
    [self.view addSubview:webView];
}
/// 模擬器載入mac本地檔案
- (void)loadLocalFile {
    // 1.建立webview，並設定大小，"20"為狀態列高度
    WKWebView *webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height - 20)];
    // 2.建立url  userName：電腦使用者名稱
    NSURL *url = [NSURL fileURLWithPath:@"/Users/userName/Desktop/bigIcon.png"];
    // 3.載入檔案
    [webView loadFileURL:url allowingReadAccessToURL:url];
    // 最後將webView新增到介面
    [self.view addSubview:webView];
}
- (void)addSubViews {
    [self addBottomViewButtons];
    
    [self.view addSubview:self.searchBar];
    
    [self.view addSubview:self.wkWebView];
}

- (void)addBottomViewButtons {
    // 記錄按鈕個數
    int count = 0;
    // 新增按鈕
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setTitle:@"後退" forState:UIControlStateNormal];
    [button setTitleColor:[UIColor colorWithRed:249 / 255.0 green:102 / 255.0 blue:129 / 255.0 alpha:1.0] forState:UIControlStateNormal];
    [button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateHighlighted];
    [button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateDisabled];
    [button.titleLabel setFont:[UIFont systemFontOfSize:15]];
    button.tag = ++count;    // 標記按鈕
    [button addTarget:self action:@selector(onBottomButtonsClicled:) forControlEvents:UIControlEventTouchUpInside];
    [self.bottomView addSubview:button];
    self.backBtn = button;
    
    button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setTitle:@"前進" forState:UIControlStateNormal];
    [button setTitleColor:[UIColor colorWithRed:249 / 255.0 green:102 / 255.0 blue:129 / 255.0 alpha:1.0] forState:UIControlStateNormal];
    [button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateHighlighted];
    [button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateDisabled];
    [button.titleLabel setFont:[UIFont systemFontOfSize:15]];
    button.tag = ++count;
    [button addTarget:self action:@selector(onBottomButtonsClicled:) forControlEvents:UIControlEventTouchUpInside];
    [self.bottomView addSubview:button];
    self.forwardBtn = button;
    
    button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setTitle:@"重新載入" forState:UIControlStateNormal];
    [button setTitleColor:[UIColor colorWithRed:249 / 255.0 green:102 / 255.0 blue:129 / 255.0 alpha:1.0] forState:UIControlStateNormal];
    [button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateHighlighted];
    [button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateDisabled];
    [button.titleLabel setFont:[UIFont systemFontOfSize:15]];
    button.tag = ++count;
    [button addTarget:self action:@selector(onBottomButtonsClicled:) forControlEvents:UIControlEventTouchUpInside];
    [self.bottomView addSubview:button];
    self.reloadBtn = button;
    
    button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setTitle:@"Safari" forState:UIControlStateNormal];
    [button setTitleColor:[UIColor colorWithRed:249 / 255.0 green:102 / 255.0 blue:129 / 255.0 alpha:1.0] forState:UIControlStateNormal];
    [button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateHighlighted];
    [button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateDisabled];
    [button.titleLabel setFont:[UIFont systemFontOfSize:15]];
    button.tag = ++count;
    [button addTarget:self action:@selector(onBottomButtonsClicled:) forControlEvents:UIControlEventTouchUpInside];
    [self.bottomView addSubview:button];
    self.browserBtn = button;
    // 統一設定frame
    [self setupBottomViewLayout];
}
- (void)setupBottomViewLayout
{
    int count = 4;
    CGFloat btnW = 80;
    CGFloat btnH = 30;
    
    CGFloat btnY = (self.bottomView.bounds.size.height - btnH) / 2;
    // 按鈕間間隙
    CGFloat margin = (self.bottomView.bounds.size.width - btnW * count) / count;
    
    CGFloat btnX = margin * 0.5;
    self.backBtn.frame = CGRectMake(btnX, btnY, btnW, btnH);
    
    btnX = self.backBtn.frame.origin.x + btnW + margin;
    self.forwardBtn.frame = CGRectMake(btnX, btnY, btnW, btnH);
    
    btnX = self.forwardBtn.frame.origin.x + btnW + margin;
    self.reloadBtn.frame = CGRectMake(btnX, btnY, btnW, btnH);
    
    btnX = self.reloadBtn.frame.origin.x + btnW + margin;
    self.browserBtn.frame = CGRectMake(btnX, btnY, btnW, btnH);
}
/// 重新整理按鈕是否允許點選
- (void)refreshBottomButtonState {
    if ([self.wkWebView canGoBack]) {
        self.backBtn.enabled = YES;
    } else {
        self.backBtn.enabled = NO;
    }
    
    if ([self.wkWebView canGoForward]) {
        self.forwardBtn.enabled = YES;
    } else {
        self.forwardBtn.enabled = NO;
    }
}
/// 按鈕點選事件
- (void)onBottomButtonsClicled:(UIButton *)sender {
    switch (sender.tag) {
        case 1:
        {
            [self.wkWebView goBack];
            [self refreshBottomButtonState];
        }
            break;
        case 2:
        {
            [self.wkWebView goForward];
            [self refreshBottomButtonState];
        }
            break;
        case 3:
            [self.wkWebView reload];
            break;
        case 4:
            [[UIApplication sharedApplication] openURL:self.wkWebView.URL];
            break;
        default:
            break;
    }
}

#pragma mark - WKWebView WKNavigationDelegate 相關
/// 是否允許載入網頁 在傳送請求之前，決定是否跳轉
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    
    NSString *urlString = [[navigationAction.request URL] absoluteString];
    
    urlString = [urlString stringByRemovingPercentEncoding];
    //    NSLog(@"urlString=%@",urlString);
    // 用://擷取字串
    NSArray *urlComps = [urlString componentsSeparatedByString:@"://"];
    if ([urlComps count]) {
        // 獲取協議頭
        NSString *protocolHead = [urlComps objectAtIndex:0];
        NSLog(@"protocolHead=%@",protocolHead);
    }
    decisionHandler(WKNavigationActionPolicyAllow);
}


#pragma mark - searchBar代理方法
/// 點選搜尋按鈕
- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
    // 建立url
    NSURL *url = nil;
    NSString *urlStr = searchBar.text;
    
    // 如果file://則為開啟bundle本地檔案，http則為網站，否則只是一般搜尋關鍵字
    if([urlStr hasPrefix:@"file://"]){
        NSRange range = [urlStr rangeOfString:@"file://"];
        NSString *fileName = [urlStr substringFromIndex:range.length];
        url = [[NSBundle mainBundle] URLForResource:fileName withExtension:nil];
        // 如果是模擬器載入電腦上的檔案，則用下面的程式碼
//        url = [NSURL fileURLWithPath:fileName];
    }else if(urlStr.length>0){
        if ([urlStr hasPrefix:@"http://"]) {
            url=[NSURL URLWithString:urlStr];
        } else {
            urlStr=[NSString stringWithFormat:@"http://www.baidu.com/s?wd=%@",urlStr];
        }
        urlStr = [urlStr stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
        url=[NSURL URLWithString:urlStr];
        
    }
    NSURLRequest *request=[NSURLRequest requestWithURL:url];
    
    // 載入請求頁面
    [self.wkWebView loadRequest:request];
}
#pragma mark - 懶載入
- (UIView *)bottomView {
    if (_bottomView == nil) {
        UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, kScreenHeight - kBottomViewH, kScreenWidth, kBottomViewH)];
        view.backgroundColor = [UIColor colorWithRed:230/255.0 green:230/255.0 blue:230/255.0 alpha:1];
        [self.view addSubview:view];
        _bottomView = view;
    }
    return _bottomView;
}
- (UISearchBar *)searchBar {
    if (_searchBar == nil) {
        UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 20, kScreenWidth, kSearchBarH)];
        searchBar.delegate = self;
        searchBar.text = @"http://www.cnblogs.com/mddblog/";
        _searchBar = searchBar;
        
    }
    return _searchBar;
}

- (WKWebView *)wkWebView {
    if (_wkWebView == nil) {
        WKWebView *webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 20 + kSearchBarH, kScreenWidth, kScreenHeight - 20 - kSearchBarH - kBottomViewH)];
        webView.navigationDelegate = self;
//                webView.scrollView.scrollEnabled = NO;
        
        //        webView.backgroundColor = [UIColor colorWithPatternImage:self.image];
        // 允許左右劃手勢導航，預設允許
        webView.allowsBackForwardNavigationGestures = YES;
        _wkWebView = webView;
    }

    return _wkWebView;
}


@end