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//
// SSWebView.m
// SSToolkit
//
// Created by Sam Soffes on 4/26/10.
// Copyright 2010-2011 Sam Soffes. All rights reserved.
//

#import "SSWebView.h"
#import "NSString+SSToolkitAdditions.h"

@interface SSWebView (PrivateMethods)
- (void)_initialize;
- (void)_loadingStatusChanged;
- (void)_startLoading;
- (void)_finishedLoading;
- (void)_DOMLoaded;
@end

@implementation SSWebView {
UIWebView *_webView;
NSUInteger _requestCount;
BOOL _testedDOM;
}


#pragma mark - Accessors

@synthesize delegate = _delegate;
@synthesize shadowsHidden = _shadowsHidden;
@synthesize consoleEnabled = _consoleEnabled;
@synthesize lastRequest = _lastRequest;
@synthesize loadingPage = _loadingPage;

#pragma mark - NSObject

- (void)dealloc {
_delegate = nil;
_webView.delegate = nil;
[_webView stopLoading];
[_webView release];
[_lastRequest release];
[super dealloc];
}


#pragma mark - UIView

- (id)initWithCoder:(NSCoder *)aDecoder {
if ((self = [super initWithCoder:aDecoder])) {
[self _initialize];
}
return self;
}


- (id)initWithFrame:(CGRect)frame {
if ((self = [super initWithFrame:frame])) {
[self _initialize];
}
return self;
}


- (void)layoutSubviews {
_webView.frame = CGRectMake(0.0f, 0.0f, self.frame.size.width, self.frame.size.height);
}


#pragma mark - SSWebView Methods

- (void)dismissKeyboard {
[_webView stringByEvaluatingJavaScriptFromString:@"document.activeElement.blur()"];
}


- (void)removeTextSelection {
if (_webView.userInteractionEnabled == NO) {
return;
}

_webView.userInteractionEnabled = NO;
_webView.userInteractionEnabled = YES;
}


- (void)reset {
BOOL loadPreviousSettings = NO;
UIDataDetectorTypes tempDataDetectorTypes;
BOOL tempScalesPageToFit;
BOOL tempAllowsInlineMediaPlayback;
BOOL tempMediaPlaybackRequiresUserAction;

if (_webView) {
_webView.delegate = nil;
[_webView stopLoading];

loadPreviousSettings = YES;
tempDataDetectorTypes = _webView.dataDetectorTypes;
tempScalesPageToFit = _webView.scalesPageToFit;
tempAllowsInlineMediaPlayback = _webView.allowsInlineMediaPlayback;
tempMediaPlaybackRequiresUserAction = _webView.mediaPlaybackRequiresUserAction;

[_webView removeFromSuperview];
[_webView release];
}

_webView = [[UIWebView alloc] initWithFrame:CGRectZero];
_webView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

if (loadPreviousSettings) {
_webView.dataDetectorTypes = tempDataDetectorTypes;
_webView.scalesPageToFit = tempScalesPageToFit;
_webView.allowsInlineMediaPlayback = tempAllowsInlineMediaPlayback;
_webView.mediaPlaybackRequiresUserAction = tempMediaPlaybackRequiresUserAction;
}

_webView.delegate = self;
[self addSubview:_webView];
}


#pragma mark - Convenience Methods

- (void)loadHTMLString:(NSString *)string {
[self loadHTMLString:string baseURL:nil];
}


- (void)loadURL:(NSURL *)aURL {
[self loadRequest:[NSURLRequest requestWithURL:aURL]];
}


- (void)loadURLString:(NSString *)string {
if ([string length] < 5) {
return;
}

if ([string hasPrefix:@"http://"] == NO && [string hasPrefix:@"https://"] == NO) {
string = [NSString stringWithFormat:@"http://%@", string];
}
[self loadURL:[NSURL URLWithString:string]];
}


#pragma mark - Private Methods

- (void)_initialize {
[self reset];

_loadingPage = NO;
_shadowsHidden = NO;
_consoleEnabled = NO;
}


- (void)_loadingStatusChanged {
if (self.loading == NO) {
[self _finishedLoading];
}
}


- (void)_startLoading {
_loadingPage = YES;
if ([_delegate respondsToSelector:@selector(webViewDidStartLoadingPage:)]) {
[_delegate webViewDidStartLoadingPage:self];
}
}


- (void)_finishedLoading {
_loadingPage = NO;
if ([_delegate respondsToSelector:@selector(webViewDidFinishLoadingPage:)]) {
[_delegate webViewDidFinishLoadingPage:self];
}
}


- (void)_DOMLoaded {
if ([_delegate respondsToSelector:@selector(webViewDidLoadDOM:)]) {
[_delegate webViewDidLoadDOM:self];
}
}


#pragma mark - Getters

- (BOOL)shadowsHidden {
for (UIView *view in [_webView subviews]) {
if ([view isKindOfClass:[UIScrollView class]]) {
for (UIView *innerView in [view subviews]) {
if ([innerView isKindOfClass:[UIImageView class]]) {
return [innerView isHidden];
}
}
}
}
return NO;
}


#pragma mark - Setters

- (void)setOpaque:(BOOL)o {
[super setOpaque:o];
_webView.opaque = o;
}


- (void)setBackgroundColor:(UIColor *)color {
[super setBackgroundColor:color];
_webView.backgroundColor = color;
}


- (void)setShadowsHidden:(BOOL)hide {
if (_shadowsHidden == hide) {
return;
}

_shadowsHidden = hide;

// Thanks @flyosity http://twitter.com/flyosity/status/17951035384
for (UIView *view in [_webView subviews]) {
if ([view isKindOfClass:[UIScrollView class]]) {
for (UIView *innerView in [view subviews]) {
if ([innerView isKindOfClass:[UIImageView class]]) {
innerView.hidden = _shadowsHidden;
}
}
}
}
}


#pragma mark - UIWebView Methods

- (BOOL)canGoBack {
return [_webView canGoBack];
}


- (BOOL)canGoForward {
return [_webView canGoForward];
}

- (void)setDataDetectorTypes:(UIDataDetectorTypes)types {
[_webView setDataDetectorTypes:types];
}


- (UIDataDetectorTypes)dataDetectorTypes {
return [_webView dataDetectorTypes];
}


- (BOOL)isLoading {
return [_webView isLoading];
}


- (NSURLRequest *)request {
return [_webView request];
}


- (BOOL)scalesPageToFit {
return [_webView scalesPageToFit];
}


- (void)setScalesPageToFit:(BOOL)scales {
[_webView setScalesPageToFit:scales];
}


- (void)goBack {
[_webView goBack];
}


- (void)goForward {
[_webView goForward];
}


- (void)loadData:(NSData *)data MIMEType:(NSString *)MIMEType textEncodingName:(NSString *)encodingName baseURL:(NSURL *)baseURL {
[_webView loadData:data MIMEType:MIMEType textEncodingName:encodingName baseURL:baseURL];
}


- (void)loadHTMLString:(NSString *)string baseURL:(NSURL *)baseURL {
if (!baseURL) {
baseURL = [NSURL URLWithString:@"http://localhost/"];
}
[_webView loadHTMLString:string baseURL:baseURL];
}


- (void)loadRequest:(NSURLRequest *)aRequest {
[_webView loadRequest:aRequest];
}


- (void)reload {
[_lastRequest release];
_lastRequest = nil;
[_webView reload];
}


- (void)stopLoading {
[_webView stopLoading];
}


- (NSString *)stringByEvaluatingJavaScriptFromString:(NSString *)script {
return [_webView stringByEvaluatingJavaScriptFromString:script];
}


- (UIScrollView *)scrollView {
#ifndef __IPHONE_5_0
for (UIView *view in [_webView subviews]) {
if ([view isKindOfClass:[UIScrollView class]]) {
return (UIScrollView *)view;
}
}
return nil;
#else
return _webView.scrollView;
#endif
}


- (BOOL)allowsInlineMediaPlayback {
return _webView.allowsInlineMediaPlayback;
}


- (void)setAllowsInlineMediaPlayback:(BOOL)allow {
_webView.allowsInlineMediaPlayback = allow;
}


- (BOOL)mediaPlaybackRequiresUserAction {
return _webView.mediaPlaybackRequiresUserAction;
}


- (void)setMediaPlaybackRequiresUserAction:(BOOL)requires {
_webView.mediaPlaybackRequiresUserAction = requires;
}


#pragma mark - UIWebViewDelegate

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
// Forward delegate message
if ([_delegate respondsToSelector:@selector(webView:didFailLoadWithError:)]) {
[_delegate webView:self didFailLoadWithError:error];
}

_requestCount--;
if (_requestCount == 0) {
[self _loadingStatusChanged];
}
}


- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)aRequest navigationType:(UIWebViewNavigationType)navigationType {
BOOL should = YES;
NSURL *url = [aRequest URL];
NSString *scheme = [url scheme];

// Check for DOM load message
if ([scheme isEqualToString:@"x-sswebview"]) {
NSString *host = [url host];
if ([host isEqualToString:@"dom-loaded"]) {
[self _DOMLoaded];
} else if ([host isEqualToString:@"log"] && _consoleEnabled) {
NSLog(@"[SSWebView Console] %@", [[url query] URLDecodedString]);
}
return NO;
}

// Forward delegate message
if ([_delegate respondsToSelector:@selector(webView:shouldStartLoadWithRequest:navigationType:)]) {
should = [_delegate webView:self shouldStartLoadWithRequest:aRequest navigationType:navigationType];
}

// Only load http or http requests if delegate doesn't care
else {
should = [scheme isEqualToString:@"http"] || [scheme isEqualToString:@"https"] || [scheme isEqualToString:@"file"];
}

// Stop if we shouldn't load it
if (should == NO) {
return NO;
}

// Starting a new request
if ([[aRequest mainDocumentURL] isEqual:[_lastRequest mainDocumentURL]] == NO) {
[_lastRequest release];
_lastRequest = [aRequest retain];
_testedDOM = NO;

[self _startLoading];
}

// Child request for same page
else {
// Reset load timer
[[self class] cancelPreviousPerformRequestsWithTarget:self selector:@selector(_loadingStatusChanged) object:nil];
}

return should;
}


- (void)webViewDidFinishLoad:(UIWebView *)webView {
// Check DOM
if (_testedDOM == NO) {
_testedDOM = YES;

        // The internal delegate will intercept this load and forward the event to the real delegate
        // Crazy javascript from http://dean.edwards.name/weblog/2006/06/again
static NSString *testDOM = @"var _SSWebViewDOMLoadTimer=setInterval(function(){if(/loaded|complete/.test(document.readyState)){clearInterval(_SSWebViewDOMLoadTimer);location.href='x-sswebview://dom-loaded'}},10);";
[self stringByEvaluatingJavaScriptFromString:testDOM];

// Override console to pass messages to NSLog
if (_consoleEnabled) {
[self stringByEvaluatingJavaScriptFromString:@"console.log=function(msg){location.href='x-sswebview://log/?'+escape(msg.toString())}"];
}
}

// Forward delegate message
if ([_delegate respondsToSelector:@selector(webViewDidFinishLoad:)]) {
[_delegate webViewDidFinishLoad:self];
}

_requestCount--;
if (_requestCount == 0) {
[self _loadingStatusChanged];
}
}


- (void)webViewDidStartLoad:(UIWebView *)webView {
// Forward delegate message
if ([_delegate respondsToSelector:@selector(webViewDidStartLoad:)]) {
[_delegate webViewDidStartLoad:self];
}
_requestCount++;
}

@end
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