PBWebCommitController.m

//
//  PBWebCommitController.m
//
//  Created by David Catmull on 10-06-11.
//

#import "PBWebCommitController.h"
#import "PBGitCommit.h"
#import "PBGitDefaults.h"
#import "GLFileView.h"
#import <CommonCrypto/CommonDigest.h>

@interface PBWebCommitController (Private)

- (NSString *)htmlForHeader:(NSArray *)header withRefs:(NSString *)badges;
- (NSString *) arbitraryHashForString:(NSString*)concat;

@end

// -parseHeader: returns an array of dictionaries with these keys
const NSString *kHeaderKeyName = @"name";
const NSString *kHeaderKeyContent = @"content";

// Keys for the author/committer dictionary
const NSString *kAuthorKeyName = @"name";
const NSString *kAuthorKeyEmail = @"email";
const NSString *kAuthorKeyDate = @"date";

@implementation PBWebCommitController

@synthesize diff;

- (void) showLongDiff
{
	showLongDiffs = TRUE;
}

- (void) awakeFromNib
{
	showLongDiffs = FALSE;
	startFile = @"history";
	[super awakeFromNib];
}

- (void)closeView
{
	[[self script] setValue:nil forKey:@"commit"];
	
	[super closeView];
}

- (void) didLoad
{
	currentSha = nil;
}

- (void) changeContentTo: (PBGitCommit *) content
{
	if (content == nil || !finishedLoading)
		return;
	
	currentSha = [content sha];
	
	// Now we load the extended details. We used to do this in a separate thread,
	// but this caused some funny behaviour because NSTask's and NSThread's don't really
	// like each other. Instead, just do it async.
	
	NSMutableArray *taskArguments = [NSMutableArray arrayWithObjects:@"show", @"--numstat", @"--summary", @"--pretty=raw", currentSha, nil];
	if (![PBGitDefaults showWhitespaceDifferences])
		[taskArguments insertObject:@"-w" atIndex:1];
	
	NSFileHandle *handle = [repository handleForArguments:taskArguments];
	NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
	// Remove notification, in case we have another one running
	[nc removeObserver:self name:NSFileHandleReadToEndOfFileCompletionNotification object:nil];
	[nc addObserver:self selector:@selector(commitDetailsLoaded:) name:NSFileHandleReadToEndOfFileCompletionNotification object:handle]; 
	[handle readToEndOfFileInBackgroundAndNotify];
}

- (void)commitDetailsLoaded:(NSNotification *)notification
{
	[[NSNotificationCenter defaultCenter] removeObserver:self name:NSFileHandleReadToEndOfFileCompletionNotification object:nil];
	
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        NSData *data = [[notification userInfo] valueForKey:NSFileHandleNotificationDataItem];
        if (!data)
            return;
        
        NSString *details = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
        if (!details)
            details = [[NSString alloc] initWithData:data encoding:NSISOLatin1StringEncoding];
        
        if (!details)
            return;
        
        // Header
        NSArray *headerItems = [PBWebCommitController parseHeader:details];
        NSString *header = [self htmlForHeader:headerItems withRefs:[self refsForCurrentCommit]];

        // In case the commit is a merge, we need to explicity give diff-tree the
        // list of parents, or else it will yield an empty result.
        // If it's not a merge, this won't hurt.
        NSMutableArray *allParents = [NSMutableArray array];

        for (NSDictionary *item in headerItems)
            if ([[item objectForKey:kHeaderKeyName] isEqualToString:@"parent"])
                [allParents addObject:[item objectForKey:kHeaderKeyContent]];

        NSArray *parents = [self chooseDiffParents:allParents];

        // File Stats
        NSMutableDictionary *stats = [PBWebCommitController parseStats:details];

        // File list
        NSMutableArray *args = [NSMutableArray arrayWithObjects:@"diff-tree", @"--root", @"-r", @"-C90%", @"-M90%", nil];
        [args addObjectsFromArray:parents];
        [args addObject:currentSha];
        NSString *dt = [repository outputInWorkdirForArguments:args];
        NSString *fileList = [GLFileView parseDiffTree:dt withStats:stats];
        
        // Diffs list
        NSString *loadingSha = currentSha;
        
        args = [NSMutableArray arrayWithObjects:@"diff-tree", @"--root", @"--cc", @"-C90%", @"-M90%", nil];
        [args addObjectsFromArray:parents];
        [args addObject:loadingSha];
        NSString *d = [repository outputInWorkdirForArguments:args];
        NSString *html;
        if(showLongDiffs || [d length] < 200000)
        {
            showLongDiffs = FALSE;
            NSString *diffs = [GLFileView parseDiff:d];
            html = [NSString stringWithFormat:@"%@%@%@",header,fileList,diffs];
        } else {
            html = [NSString stringWithFormat:@"%@%@<div id='diffs'><p>This is a very large commit. It may take a long time to load the diff. Click <a href='' onclick='showFullDiff(); return false;'>here</a> to show anyway.</p></div>",header,fileList,currentSha];
        }

        html = [html stringByReplacingOccurrencesOfString:@"{SHA_PREV}" withString:[NSString stringWithFormat:@"%@^",currentSha]];
        html = [html stringByReplacingOccurrencesOfString:@"{SHA}" withString:currentSha];
        
        dispatch_async(dispatch_get_main_queue(), ^{
            // If a bunch of commits were selected quickly we check to make sure the commit we requested is still active
            if ([currentSha isEqualToString:loadingSha]) {
                [[view windowScriptObject] callWebScriptMethod:@"showCommit" withArguments:[NSArray arrayWithObject:html]];
                
    #ifdef DEBUG_BUILD
                NSString *dom = [(DOMHTMLElement*)[[[view mainFrame] DOMDocument] documentElement] outerHTML];
                NSString *tmpFile = @"~/tmp/test2.html";
                [dom writeToFile:[tmpFile stringByExpandingTildeInPath] atomically:true encoding:NSUTF8StringEncoding error:nil];
    #endif
            }
        });
    });
}

- (NSString*) refsForCurrentCommit
{
  return @"";
}

- (NSArray*) chooseDiffParents:(NSArray *)parents
{
	return parents;
}

+ (NSMutableDictionary *)parseStats:(NSString *)txt
{
	NSArray *lines = [txt componentsSeparatedByString:@"\n"];
	NSMutableDictionary *stats=[NSMutableDictionary dictionary];
	int black=0;
	for(NSString *line in lines){
		if([line length]==0){
			black++;
		}else if(black==2){
			NSArray *file=[line componentsSeparatedByString:@"\t"];
			if([file count]==3){
				[stats setObject:file forKey:[file objectAtIndex:2]];
			}
		}
	}
	return stats;
}

+ (NSArray *)parseHeader:(NSString *)text
{
	NSMutableArray *result = [NSMutableArray array];
	NSArray *lines = [text componentsSeparatedByString:@"\n"];
	BOOL parsingSubject = NO;
	
	for (NSString *line in lines) {
		if ([line length] == 0) {
			if (!parsingSubject)
				parsingSubject = TRUE;
			else
				break;
		} else {
			if (parsingSubject) {
				NSString *trimmedLine = [line stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
				[result addObject:[NSDictionary dictionaryWithObjectsAndKeys:
						@"subject", kHeaderKeyName, trimmedLine, kHeaderKeyContent, nil]];
			} else {
				NSArray *comps = [line componentsSeparatedByString:@" "];
				if ([comps count] == 2) {
					[result addObject:[NSDictionary dictionaryWithObjectsAndKeys:
							[comps objectAtIndex:0], kHeaderKeyName,
							[comps objectAtIndex:1], kHeaderKeyContent, nil]];
				} else if ([comps count] > 2) {
					NSRange r_email_i = [line rangeOfString:@"<"];
					NSRange r_email_e = [line rangeOfString:@">"];
					NSRange r_name_i = [line rangeOfString:@" "];
					
					NSString *name = [line substringWithRange:NSMakeRange(r_name_i.location,(r_email_i.location-r_name_i.location))];
					NSString *email = [line substringWithRange:NSMakeRange(r_email_i.location+1,((r_email_e.location-1)-r_email_i.location))];
					
					NSArray *t=[[line substringFromIndex:r_email_e.location+2] componentsSeparatedByString:@" "];
					NSDate *date=[NSDate dateWithTimeIntervalSince1970:[[t objectAtIndex:0] doubleValue]];
					
					NSDictionary *content = [NSDictionary dictionaryWithObjectsAndKeys:
							name, kAuthorKeyName,
							email, kAuthorKeyEmail,
							date, kAuthorKeyDate,
							nil];
					[result addObject:[NSDictionary dictionaryWithObjectsAndKeys:
							[comps objectAtIndex:0], kHeaderKeyName,
							content, kHeaderKeyContent,
							nil]];
				}
			}
		}
	}
	
	return result;
}

- (NSString *)htmlForHeader:(NSArray *)header withRefs:(NSString *)badges
{
	NSString *last_mail = @"";
	NSMutableString *subjectFirst = [NSMutableString string];
	NSMutableString *auths=[NSMutableString string];
	NSMutableString *refs=[NSMutableString string];
	NSMutableString *subject=[NSMutableString string];
	NSMutableString *all=[NSMutableString string];
	
	for (NSDictionary *item in header) {
		if ([[item objectForKey:kHeaderKeyName] isEqualToString:@"subject"]) {
			if ([subjectFirst isEqualToString:@""]) {
				[subjectFirst appendString:[NSString stringWithFormat:@"%@",[GLFileView escapeHTML:[item objectForKey:kHeaderKeyContent]]]];
			} else {
				[subject appendString:[NSString stringWithFormat:@"%@<br/>",[GLFileView escapeHTML:[item objectForKey:kHeaderKeyContent]]]];
			}

		}else{
			if([[item objectForKey:kHeaderKeyContent] isKindOfClass:[NSString class]]){
                NSString *name=[item objectForKey:kHeaderKeyName];
                if([name isEqualToString:@"commit"]){
                    [refs appendString:[NSString stringWithFormat:@"<tr><td>%@&nbsp;:</td><td><p>%@</p></td></tr>",name,[item objectForKey:kHeaderKeyContent]]];
                }else{
                    [refs appendString:[NSString stringWithFormat:@"<tr><td>%@&nbsp;:</td><td><a href='' onclick='selectCommit(this.innerHTML); return false;'>%@</a></td></tr>",name,[item objectForKey:kHeaderKeyContent]]];
                }
			}else{  // NSDictionary: author or committer
				NSDictionary *content = [item objectForKey:kHeaderKeyContent];
				NSString *email = [content objectForKey:kAuthorKeyEmail];
				
				if(![email isEqualToString:last_mail]){
					NSString *name = [content objectForKey:kAuthorKeyName];
					NSDate *date = [content objectForKey:kAuthorKeyDate];
					NSDateFormatter* theDateFormatter = [[NSDateFormatter alloc] init];  
					[theDateFormatter setDateStyle:NSDateFormatterMediumStyle];  
					[theDateFormatter setTimeStyle:NSDateFormatterMediumStyle];  
					NSString *dateString=[theDateFormatter stringForObjectValue:date];
									
					[auths appendString:[NSString stringWithFormat:@"<div class='user %@ clearfix'>",[item objectForKey:kHeaderKeyName]]];
					if([self isFeatureEnabled:@"gravatar"]){
						NSString *hash=[self arbitraryHashForString:email];
						[auths appendString:[NSString stringWithFormat:@"<img class='avatar' src='http://www.gravatar.com/avatar/%@?d=wavatar&s=30'/>",hash]];
					}
					[auths appendString:[NSString stringWithFormat:@"<p class='name'>%@ <span class='rol'>(%@)</span></p>",name,[item objectForKey:kHeaderKeyName]]];
					[auths appendString:[NSString stringWithFormat:@"<p class='time'>%@</p></div>",dateString]];
				}
				last_mail=email;
			}
		}
	}	
	
	[all appendString:[NSString stringWithFormat:@"<div id='header' class='clearfix'><table class='references'>%@</table><p class='subject'>%@</p>%@",refs,subjectFirst,auths]];

	if (![badges isEqualToString:@""])
		[all appendString:[NSString stringWithFormat:@"<div id='badges'>%@</div>",badges]];

	[all appendString:@"</div>"];

	if (![subject isEqualToString:@""])
		[all appendString:[NSString stringWithFormat:@"<p class='subjectDetail'>%@</p>",subject]];

	return all;
}

- (NSString *) arbitraryHashForString:(NSString*)concat {
	const char *concat_str = [concat UTF8String];
	unsigned char result[CC_MD5_DIGEST_LENGTH];
	CC_MD5(concat_str, strlen(concat_str), result);
	
	NSMutableString *hash = [NSMutableString string];
	
	int i;
	for (i = 0; i < 16; i++)
		[hash appendFormat:@"%02x", result[i]];
	
	return hash;
}

- (void)selectCommit:(NSString *)sha
{
}

// TODO: this is duplicated in PBWebDiffController
- (void) openFileMerge:(NSString*)file sha:(NSString *)sha sha2:(NSString *)sha2
{
	NSArray *args=[NSArray arrayWithObjects:@"difftool",@"--no-prompt",@"--tool=opendiff",sha,sha2,@"--",file,nil];
	[repository handleInWorkDirForArguments:args];
}

- (void) sendKey: (NSString*) key
{
	id script = [view windowScriptObject];
	[script callWebScriptMethod:@"handleKeyFromCocoa" withArguments: [NSArray arrayWithObject:key]];
}

- (void) copySource
{
	NSString *source = [(DOMHTMLElement *)[[[view mainFrame] DOMDocument] documentElement] outerHTML];
	NSPasteboard *a =[NSPasteboard generalPasteboard];
	[a declareTypes:[NSArray arrayWithObject:NSStringPboardType] owner:self];
	[a setString:source forType: NSStringPboardType];
}

- (PBGitRef*) refFromString:(NSString*)refString
{
	return nil;
}

- (NSArray*) menuItemsForPath:(NSString*)path
{
	return nil;
}

- (NSArray *)      webView:(WebView *)sender
contextMenuItemsForElement:(NSDictionary *)element
          defaultMenuItems:(NSArray *)defaultMenuItems
{
	DOMNode *node = [element valueForKey:@"WebElementDOMNode"];
	
	while (node) {
		// Every ref has a class name of 'refs' and some other class. We check on that to see if we pressed on a ref.
		if ([[node className] hasPrefix:@"refs "]) {
			NSString *selectedRefString = [[[node childNodes] item:0] textContent];
			PBGitRef *ref = [self refFromString:selectedRefString];
			if (ref != nil)
				return [contextMenuDelegate menuItemsForRef:ref];
			DLog(@"Could not find selected ref!");
			return defaultMenuItems;
		}
		if ([node hasAttributes] && [[node attributes] getNamedItem:@"representedFile"])
			return [self menuItemsForPath:[[[node attributes] getNamedItem:@"representedFile"] value]];
		else if ([[node class] isEqual:[DOMHTMLImageElement class]]) {
			// Copy Image is the only menu item that makes sense here since we don't need
			// to download the image or open it in a new window (besides with the
			// current implementation these two entries can crash GitX anyway)
			for (NSMenuItem *item in defaultMenuItems)
				if ([item tag] == WebMenuItemTagCopyImageToClipboard)
					return [NSArray arrayWithObject:item];
			return nil;
		}
		
		node = [node parentNode];
	}
	
	return defaultMenuItems;
}


// Open external links in the default browser
-   (void)webView:(WebView *)sender decidePolicyForNewWindowAction:(NSDictionary *)actionInformation
		  request:(NSURLRequest *)request
	 newFrameName:(NSString *)frameName
 decisionListener:(id < WebPolicyDecisionListener >)listener
{
	[[NSWorkspace sharedWorkspace] openURL:[request URL]];
}

- getConfig:(NSString *)config
{
	return [repository valueForKeyPath:[@"config." stringByAppendingString:config]];
}

- (void) preferencesChanged
{
	[[self script] callWebScriptMethod:@"enableFeatures" withArguments:nil];
}

@end