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//
// PBGitRepository.m
// GitTest
//
// Created by Pieter de Bie on 13-06-08.
// Copyright 2008 __MyCompanyName__. All rights reserved.
//

#import "PBGitRepository.h"
#import "PBGitCommit.h"
#import "PBGitWindowController.h"
#import "PBGitBinary.h"

#import "NSFileHandleExt.h"
#import "PBEasyPipe.h"
#import "PBGitRef.h"
#import "PBGitRevSpecifier.h"

NSString* PBGitRepositoryErrorDomain = @"GitXErrorDomain";

@implementation PBGitRepository

@synthesize revisionList, branches, currentBranch, refs, hasChanged, config;

- (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError
{
if (outError) {
*outError = [NSError errorWithDomain:PBGitRepositoryErrorDomain
                                      code:0
                                  userInfo:[NSDictionary dictionaryWithObject:@"Reading files is not supported." forKey:NSLocalizedFailureReasonErrorKey]];
}
return NO;
}

+ (BOOL) isBareRepository: (NSString*) path
{
return [[PBEasyPipe outputForCommand:[PBGitBinary path] withArgs:[NSArray arrayWithObjects:@"rev-parse", @"--is-bare-repository", nil] inDir:path] isEqualToString:@"true"];
}

+ (NSURL*)gitDirForURL:(NSURL*)repositoryURL;
{
if (![PBGitBinary path])
return nil;

NSString* repositoryPath = [repositoryURL path];

if ([self isBareRepository:repositoryPath])
return repositoryURL;


// Use rev-parse to find the .git dir for the repository being opened
NSString* newPath = [PBEasyPipe outputForCommand:[PBGitBinary path] withArgs:[NSArray arrayWithObjects:@"rev-parse", @"--git-dir", nil] inDir:repositoryPath];
if ([newPath isEqualToString:@".git"])
return [NSURL fileURLWithPath:[repositoryPath stringByAppendingPathComponent:@".git"]];
if ([newPath length] > 0)
return [NSURL fileURLWithPath:newPath];

return nil;
}

// For a given path inside a repository, return either the .git dir
// (for a bare repo) or the directory above the .git dir otherwise
+ (NSURL*)baseDirForURL:(NSURL*)repositoryURL;
{
NSURL* gitDirURL = [self gitDirForURL:repositoryURL];
NSString* repositoryPath = [gitDirURL path];

if (![self isBareRepository:repositoryPath]) {
repositoryURL = [NSURL fileURLWithPath:[[repositoryURL path] stringByDeletingLastPathComponent]];
}

return repositoryURL;
}

// NSFileWrapper is broken and doesn't work when called on a directory containing a large number of directories and files.
//because of this it is safer to implement readFromURL than readFromFileWrapper.
//Because NSFileManager does not attempt to recursively open all directories and file when fileExistsAtPath is called
//this works much better.
- (BOOL)readFromURL:(NSURL *)absoluteURL ofType:(NSString *)typeName error:(NSError **)outError
{
if (![PBGitBinary path])
{
if (outError) {
NSDictionary* userInfo = [NSDictionary dictionaryWithObject:[PBGitBinary notFoundError]
forKey:NSLocalizedRecoverySuggestionErrorKey];
*outError = [NSError errorWithDomain:PBGitRepositoryErrorDomain code:0 userInfo:userInfo];
}
return NO;
}

BOOL isDirectory = FALSE;
[[NSFileManager defaultManager] fileExistsAtPath:[absoluteURL path] isDirectory:&isDirectory];
if (!isDirectory) {
if (outError) {
NSDictionary* userInfo = [NSDictionary dictionaryWithObject:@"Reading files is not supported."
forKey:NSLocalizedRecoverySuggestionErrorKey];
*outError = [NSError errorWithDomain:PBGitRepositoryErrorDomain code:0 userInfo:userInfo];
}
return NO;
}


NSURL* gitDirURL = [PBGitRepository gitDirForURL:[self fileURL]];
if (!gitDirURL) {
if (outError) {
NSDictionary* userInfo = [NSDictionary dictionaryWithObject:[NSString stringWithFormat:@"%@ does not appear to be a git repository.", [self fileName]]
forKey:NSLocalizedRecoverySuggestionErrorKey];
*outError = [NSError errorWithDomain:PBGitRepositoryErrorDomain code:0 userInfo:userInfo];
}
return NO;
}

[self setFileURL:gitDirURL];
[self setup];
[self readCurrentBranch];
return YES;
}

- (void) setup
{
config = [[PBGitConfig alloc] initWithRepository:self.fileURL.path];
self.branches = [NSMutableArray array];
[self reloadRefs];
revisionList = [[PBGitRevList alloc] initWithRepository:self];
}

- (id) initWithURL: (NSURL*) path
{
if (![PBGitBinary path])
return nil;

NSURL* gitDirURL = [PBGitRepository gitDirForURL:path];
if (!gitDirURL)
return nil;

self = [self init];
[self setFileURL: gitDirURL];

[self setup];

// We don't want the window controller to display anything yet..
// We'll leave that to the caller of this method.
#ifndef CLI
[self addWindowController:[[PBGitWindowController alloc] initWithRepository:self displayDefault:NO]];
#endif

[self showWindows];

return self;
}

// The fileURL the document keeps is to the .git dir, but that’s pretty
// useless for display in the window title bar, so we show the directory above
- (NSString*)displayName
{
NSString* dirName = self.fileURL.path.lastPathComponent;
if ([dirName isEqualToString:@".git"])
dirName = [self.fileURL.path stringByDeletingLastPathComponent].lastPathComponent;
NSString* displayName;
if (![[PBGitRef refFromString:[[self headRef] simpleRef]] type]) {
displayName = [NSString stringWithFormat:@"%@ (detached HEAD)", dirName];
} else {
displayName = [NSString stringWithFormat:@"%@ (branch: %@)", dirName,
[[self headRef] description]];
}

return displayName;
}

// Get the .gitignore file at the root of the repository
- (NSString*)gitIgnoreFilename
{
return [[self workingDirectory] stringByAppendingPathComponent:@".gitignore"];
}

- (BOOL)isBareRepository
{
if([self workingDirectory]) {
return [PBGitRepository isBareRepository:[self workingDirectory]];
} else {
return true;
}
}

// Overridden to create our custom window controller
- (void)makeWindowControllers
{
#ifndef CLI
[self addWindowController: [[PBGitWindowController alloc] initWithRepository:self displayDefault:YES]];
#endif
}

- (PBGitWindowController *)windowController
{
if ([[self windowControllers] count] == 0)
return NULL;

return [[self windowControllers] objectAtIndex:0];
}

- (void) addRef: (PBGitRef *) ref fromParameters: (NSArray *) components
{
NSString* type = [components objectAtIndex:1];

NSString* sha;
if ([type isEqualToString:@"tag"] && [components count] == 4)
sha = [components objectAtIndex:3];
else
sha = [components objectAtIndex:2];

NSMutableArray* curRefs;
if (curRefs = [refs objectForKey:sha])
[curRefs addObject:ref];
else
[refs setObject:[NSMutableArray arrayWithObject:ref] forKey:sha];
}

// reloadRefs: reload all refs in the repository, like in readRefs
// To stay compatible, this does not remove a ref from the branches list
// even after it has been deleted.
// returns YES when a ref was changed
- (BOOL) reloadRefs
{
_headRef = nil;
BOOL ret = NO;

refs = [NSMutableDictionary dictionary];

NSString* output = [PBEasyPipe outputForCommand:[PBGitBinary path]
withArgs:[NSArray arrayWithObjects:@"for-each-ref", @"--format=%(refname) %(objecttype) %(objectname)"
" %(*objectname)", @"refs", nil]
inDir: self.fileURL.path];
NSArray* lines = [output componentsSeparatedByString:@"\n"];

for (NSString* line in lines) {
// If its an empty line, skip it (e.g. with empty repositories)
if ([line length] == 0)
continue;

NSArray* components = [line componentsSeparatedByString:@" "];

// First do the ref matching. If this ref is new, add it to our ref list
PBGitRef *newRef = [PBGitRef refFromString:[components objectAtIndex:0]];
PBGitRevSpecifier* revSpec = [[PBGitRevSpecifier alloc] initWithRef:newRef];
if ([self addBranch:revSpec] != revSpec)
ret = YES;

// Also add this ref to the refs list
[self addRef:newRef fromParameters:components];
}

// Add an "All branches" option in the branches list
[self addBranch:[PBGitRevSpecifier allBranchesRevSpec]];
[self addBranch:[PBGitRevSpecifier localBranchesRevSpec]];

[[[self windowController] window] setTitle:[self displayName]];

return ret;
}

- (void) lazyReload
{
if (!hasChanged)
return;

[self reloadRefs];
[self.revisionList reload];
hasChanged = NO;
}

- (PBGitRevSpecifier *)headRef
{
if (_headRef)
return _headRef;

NSString* branch = [self parseSymbolicReference: @"HEAD"];
if (branch && [branch hasPrefix:@"refs/heads/"])
_headRef = [[PBGitRevSpecifier alloc] initWithRef:[PBGitRef refFromString:branch]];
else
_headRef = [[PBGitRevSpecifier alloc] initWithRef:[PBGitRef refFromString:@"HEAD"]];

return _headRef;
}

// Returns either this object, or an existing, equal object
- (PBGitRevSpecifier*) addBranch: (PBGitRevSpecifier*) rev
{
if ([[rev parameters] count] == 0)
rev = [self headRef];

// First check if the branch doesn't exist already
for (PBGitRevSpecifier* r in branches)
if ([rev isEqualTo: r])
return r;

[self willChangeValueForKey:@"branches"];
[branches addObject: rev];
[self didChangeValueForKey:@"branches"];
return rev;
}

- (BOOL)removeBranch:(PBGitRevSpecifier *)rev
{
for (PBGitRevSpecifier *r in branches) {
if ([rev isEqualTo:r]) {
[self willChangeValueForKey:@"branches"];
[branches removeObject:r];
[self didChangeValueForKey:@"branches"];
return TRUE;
}
}
return FALSE;
}

- (void) readCurrentBranch
{
self.currentBranch = [self addBranch: [self headRef]];
}

- (NSString *) workingDirectory
{
if ([self.fileURL.path hasSuffix:@"/.git"])
return [self.fileURL.path substringToIndex:[self.fileURL.path length] - 5];
else if ([[self outputForCommand:@"rev-parse --is-inside-work-tree"] isEqualToString:@"true"])
return [PBGitBinary path];

return nil;
}

- (int) returnValueForCommand:(NSString *)cmd
{
int i;
[self outputForCommand:cmd retValue: &i];
return i;
}

- (NSFileHandle*) handleForArguments:(NSArray *)args
{
NSString* gitDirArg = [@"--git-dir=" stringByAppendingString:self.fileURL.path];
NSMutableArray* arguments = [NSMutableArray arrayWithObject: gitDirArg];
[arguments addObjectsFromArray: args];
return [PBEasyPipe handleForCommand:[PBGitBinary path] withArgs:arguments];
}

- (NSFileHandle*) handleInWorkDirForArguments:(NSArray *)args
{
NSString* gitDirArg = [@"--git-dir=" stringByAppendingString:self.fileURL.path];
NSMutableArray* arguments = [NSMutableArray arrayWithObject: gitDirArg];
[arguments addObjectsFromArray: args];
return [PBEasyPipe handleForCommand:[PBGitBinary path] withArgs:arguments inDir:[self workingDirectory]];
}

- (NSFileHandle*) handleForCommand:(NSString *)cmd
{
NSArray* arguments = [cmd componentsSeparatedByString:@" "];
return [self handleForArguments:arguments];
}

- (NSString*) outputForCommand:(NSString *)cmd
{
NSArray* arguments = [cmd componentsSeparatedByString:@" "];
return [self outputForArguments: arguments];
}

- (NSString*) outputForCommand:(NSString *)str retValue:(int *)ret;
{
NSArray* arguments = [str componentsSeparatedByString:@" "];
return [self outputForArguments: arguments retValue: ret];
}

- (NSString*) outputForArguments:(NSArray*) arguments
{
return [PBEasyPipe outputForCommand:[PBGitBinary path] withArgs:arguments inDir: self.fileURL.path];
}

- (NSString*) outputInWorkdirForArguments:(NSArray*) arguments
{
return [PBEasyPipe outputForCommand:[PBGitBinary path] withArgs:arguments inDir: [self workingDirectory]];
}

- (NSString*) outputInWorkdirForArguments:(NSArray *)arguments retValue:(int *)ret
{
return [PBEasyPipe outputForCommand:[PBGitBinary path] withArgs:arguments inDir:[self workingDirectory] retValue: ret];
}

- (NSString*) outputForArguments:(NSArray *)arguments retValue:(int *)ret
{
return [PBEasyPipe outputForCommand:[PBGitBinary path] withArgs:arguments inDir: self.fileURL.path retValue: ret];
}

- (NSString*) outputForArguments:(NSArray *)arguments inputString:(NSString *)input retValue:(int *)ret
{
return [PBEasyPipe outputForCommand:[PBGitBinary path]
withArgs:arguments
inDir:[self workingDirectory]
inputString:input
retValue: ret];
}

- (NSString *)outputForArguments:(NSArray *)arguments inputString:(NSString *)input byExtendingEnvironment:(NSDictionary *)dict retValue:(int *)ret
{
return [PBEasyPipe outputForCommand:[PBGitBinary path]
withArgs:arguments
inDir:[self workingDirectory]
byExtendingEnvironment:dict
inputString:input
retValue: ret];
}

- (BOOL)executeHook:(NSString *)name output:(NSString **)output
{
return [self executeHook:name withArgs:[NSArray array] output:output];
}

- (BOOL)executeHook:(NSString *)name withArgs:(NSArray *)arguments output:(NSString **)output
{
NSString *hookPath = [[[[self fileURL] path] stringByAppendingPathComponent:@"hooks"] stringByAppendingPathComponent:name];
if (![[NSFileManager defaultManager] isExecutableFileAtPath:hookPath])
return TRUE;

NSDictionary *info = [NSDictionary dictionaryWithObjectsAndKeys:
[self fileURL].path, @"GIT_DIR",
[[self fileURL].path stringByAppendingPathComponent:@"index"], @"GIT_INDEX_FILE",
nil
];

int ret = 1;
NSString *_output = [PBEasyPipe outputForCommand:hookPath withArgs:arguments inDir:[self workingDirectory] byExtendingEnvironment:info inputString:nil retValue:&ret];

if (output)
*output = _output;

return ret == 0;
}

- (NSString *)parseReference:(NSString *)reference
{
int ret = 1;
NSString *ref = [self outputForArguments:[NSArray arrayWithObjects: @"rev-parse", @"--verify", reference, nil] retValue: &ret];
if (ret)
return nil;

return ref;
}

- (NSString*) parseSymbolicReference:(NSString*) reference
{
NSString* ref = [self outputForArguments:[NSArray arrayWithObjects: @"symbolic-ref", @"-q", reference, nil]];
if ([ref hasPrefix:@"refs/"])
return ref;

return nil;
}

- (void) finalize
{
NSLog(@"Dealloc of repository");
[super finalize];
}
@end
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