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//
// PBGitTree.m
// GitTest
//
// Created by Pieter de Bie on 15-06-08.
// Copyright 2008 __MyCompanyName__. All rights reserved.
//

#import "PBGitTree.h"
#import "PBGitCommit.h"
#import "NSFileHandleExt.h"
#import "PBEasyPipe.h"
#import "PBEasyFS.h"

@implementation PBGitTree

@synthesize sha, path, repository, leaf, parent;

+ (PBGitTree*) rootForCommit:(id) commit
{
PBGitCommit* c = commit;
PBGitTree* tree = [[self alloc] init];
tree.parent = nil;
tree.leaf = NO;
tree.sha = [c realSha];
tree.repository = c.repository;
tree.path = @"";
return tree;
}

+ (PBGitTree*) treeForTree: (PBGitTree*) prev andPath: (NSString*) path;
{
PBGitTree* tree = [[self alloc] init];
tree.parent = prev;
tree.sha = prev.sha;
tree.repository = prev.repository;
tree.path = path;
return tree;
}

- init
{
children = nil;
localFileName = nil;
leaf = YES;
return self;
}

- (NSString*) refSpec
{
return [NSString stringWithFormat:@"%@:%@", self.sha, self.fullPath];
}

- (BOOL) isLocallyCached
{
NSFileManager* fs = [NSFileManager defaultManager];
if (localFileName && [fs fileExistsAtPath:localFileName])
{
NSDate* mtime = [[fs attributesOfItemAtPath:localFileName error: nil] objectForKey:NSFileModificationDate];
if ([mtime compare:localMtime] == 0)
return YES;
}
return NO;
}

- (BOOL)hasBinaryHeader:(NSString*)contents
{
if(!contents)
return NO;

return [contents rangeOfString:@"\0" options:0 range:NSMakeRange(0, ([contents length] >= 8000) ? 7999 : [contents length])].location != NSNotFound;
}

- (BOOL)hasBinaryAttributes
{
// First ask git check-attr if the file has a binary attribute custom set
NSFileHandle *handle = [repository handleInWorkDirForArguments:[NSArray arrayWithObjects:@"check-attr", @"binary", [self fullPath], nil]];
NSData *data = [handle readDataToEndOfFile];
NSString *string = [[NSString alloc] initWithData:data encoding:NSISOLatin1StringEncoding];

if (!string)
return NO;
string = [string stringByTrimmingCharactersInSet:[NSCharacterSet newlineCharacterSet]];

if ([string hasSuffix:@"binary: set"])
return YES;

if ([string hasSuffix:@"binary: unset"])
return NO;

// Binary state unknown, do a check on common filename-extensions
for (NSString *extension in [NSArray arrayWithObjects:@".pdf", @".jpg", @".jpeg", @".png", @".bmp", @".gif", @".o", nil]) {
if ([[self fullPath] hasSuffix:extension])
return YES;
}

return NO;
}

- (NSString*) contents
{
if (!leaf)
return [NSString stringWithFormat:@"This is a tree with path %@", [self fullPath]];

if ([self isLocallyCached]) {
NSData *data = [NSData dataWithContentsOfFile:localFileName];
NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
if (!string)
string = [[NSString alloc] initWithData:data encoding:NSISOLatin1StringEncoding];
return string;
}

return [repository outputForArguments:[NSArray arrayWithObjects:@"show", [self refSpec], nil]];
}

- (long long)fileSize
{
if (_fileSize)
return _fileSize;

NSFileHandle *handle = [repository handleForArguments:[NSArray arrayWithObjects:@"cat-file", @"-s", [self refSpec], nil]];
NSString *sizeString = [[NSString alloc] initWithData:[handle readDataToEndOfFile] encoding:NSISOLatin1StringEncoding];

if (!sizeString)
_fileSize = -1;
else
_fileSize = [sizeString longLongValue];

return _fileSize;
}

- (NSString *)textContents
{
if (!leaf)
return [NSString stringWithFormat:@"This is a tree with path %@", [self fullPath]];

if ([self hasBinaryAttributes])
return [NSString stringWithFormat:@"%@ appears to be a binary file of %d bytes", [self fullPath], [self fileSize]];

if ([self fileSize] > 52428800) // ~50MB
return [NSString stringWithFormat:@"%@ is too big to be displayed (%d bytes)", [self fullPath], [self fileSize]];

NSString* contents = [self contents];

if ([self hasBinaryHeader:contents])
return [NSString stringWithFormat:@"%@ appears to be a binary file of %d bytes", [self fullPath], [self fileSize]];

return contents;
}

- (void) saveToFolder: (NSString *) dir
{
NSString* newName = [dir stringByAppendingPathComponent:path];

if (leaf) {
NSFileHandle* handle = [repository handleForArguments:[NSArray arrayWithObjects:@"show", [self refSpec], nil]];
NSData* data = [handle readDataToEndOfFile];
[data writeToFile:newName atomically:YES];
} else { // Directory
[[NSFileManager defaultManager] createDirectoryAtPath:newName attributes:nil];
for (PBGitTree* child in [self children])
[child saveToFolder: newName];
}
}

- (NSString*) tmpDirWithContents
{
if (leaf)
return nil;

if (!localFileName)
localFileName = [PBEasyFS tmpDirWithPrefix: path];

for (PBGitTree* child in [self children]) {
[child saveToFolder: localFileName];
}

return localFileName;
}



- (NSString*) tmpFileNameForContents
{
if (!leaf)
return [self tmpDirWithContents];

if ([self isLocallyCached])
return localFileName;

if (!localFileName)
localFileName = [[PBEasyFS tmpDirWithPrefix: sha] stringByAppendingPathComponent:path];

NSFileHandle* handle = [repository handleForArguments:[NSArray arrayWithObjects:@"show", [self refSpec], nil]];
NSData* data = [handle readDataToEndOfFile];
[data writeToFile:localFileName atomically:YES];

NSFileManager* fs = [NSFileManager defaultManager];
localMtime = [[fs attributesOfItemAtPath:localFileName error: nil] objectForKey:NSFileModificationDate];

return localFileName;
}

- (NSArray*) children
{
if (children != nil)
return children;

NSString* ref = [self refSpec];

NSFileHandle* handle = [repository handleForArguments:[NSArray arrayWithObjects:@"show", ref, nil]];
[handle readLine];
[handle readLine];

NSMutableArray* c = [NSMutableArray array];

NSString* p = [handle readLine];
while (p.length > 0) {
BOOL isLeaf = ([p characterAtIndex:p.length - 1] != '/');
if (!isLeaf)
p = [p substringToIndex:p.length -1];

PBGitTree* child = [PBGitTree treeForTree:self andPath:p];
child.leaf = isLeaf;
[c addObject: child];

p = [handle readLine];
}
children = c;
return c;
}

- (NSString*) fullPath
{
if (!parent)
return @"";

if ([parent.fullPath isEqualToString:@""])
return self.path;

return [parent.fullPath stringByAppendingPathComponent: self.path];
}

- (void) finalize
{
if (localFileName)
[[NSFileManager defaultManager] removeFileAtPath:localFileName handler:nil];
[super finalize];
}
@end
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