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//
// PBGitRevList.m
// GitX
//
// Created by Pieter de Bie on 17-06-08.
// Copyright 2008 __MyCompanyName__. All rights reserved.
//

#import "PBGitRevList.h"
#import "PBGitRepository.h"
#import "PBGitCommit.h"
#import "PBGitGrapher.h"
#import "PBGitRevSpecifier.h"

#include <ext/stdio_filebuf.h>
#include <iostream>
#include <string>
#include <map>

using namespace std;


@interface PBGitRevList ()

@property (assign) BOOL isParsing;

@end


#define kRevListThreadKey @"thread"
#define kRevListRevisionsKey @"revisions"


@implementation PBGitRevList

@synthesize commits;
@synthesize isParsing;


- (id) initWithRepository:(PBGitRepository *)repo rev:(PBGitRevSpecifier *)rev shouldGraph:(BOOL)graph
{
repository = repo;
isGraphing = graph;
currentRev = [rev copy];

return self;
}


- (void) loadRevisons
{
[parseThread cancel];

parseThread = [[NSThread alloc] initWithTarget:self selector:@selector(walkRevisionListWithSpecifier:) object:currentRev];
self.isParsing = YES;
resetCommits = YES;
[parseThread start];
}


- (void)cancel
{
[parseThread cancel];
}


- (void) finishedParsing
{
self.isParsing = NO;
}


- (void) updateCommits:(NSDictionary *)update
{
if ([update objectForKey:kRevListThreadKey] != parseThread)
return;

NSArray *revisions = [update objectForKey:kRevListRevisionsKey];
if (!revisions || [revisions count] == 0)
return;

if (resetCommits) {
self.commits = [NSMutableArray array];
resetCommits = NO;
}

NSRange range = NSMakeRange([commits count], [revisions count]);
NSIndexSet *indexes = [NSIndexSet indexSetWithIndexesInRange:range];

[self willChange:NSKeyValueChangeInsertion valuesAtIndexes:indexes forKey:@"commits"];
[commits addObjectsFromArray:revisions];
[self didChange:NSKeyValueChangeInsertion valuesAtIndexes:indexes forKey:@"commits"];
}


- (void) walkRevisionListWithSpecifier:(PBGitRevSpecifier*)rev
{
NSDate *start = [NSDate date];
NSDate *lastUpdate = [NSDate date];
NSMutableArray *revisions = [NSMutableArray array];
PBGitGrapher *g = [[PBGitGrapher alloc] initWithRepository:repository];
std::map<string, NSStringEncoding> encodingMap;
NSThread *currentThread = [NSThread currentThread];

NSString *formatString = @"--pretty=format:%H\01%e\01%aN\01%cN\01%s\01%P\01%at";
BOOL showSign = [rev hasLeftRight];

if (showSign)
formatString = [formatString stringByAppendingString:@"\01%m"];

NSMutableArray *arguments = [NSMutableArray arrayWithObjects:@"log", @"-z", @"--topo-order", @"--children", formatString, nil];

if (!rev)
[arguments addObject:@"HEAD"];
else
[arguments addObjectsFromArray:[rev parameters]];

NSString *directory = rev.workingDirectory ? rev.workingDirectory.path : repository.fileURL.path;
NSTask *task = [PBEasyPipe taskForCommand:[PBGitBinary path] withArgs:arguments inDir:directory];
[task launch];
NSFileHandle *handle = [task.standardOutput fileHandleForReading];

int fd = [handle fileDescriptor];
__gnu_cxx::stdio_filebuf<char> buf(fd, std::ios::in);
std::istream stream(&buf);

int num = 0;
while (true) {
if ([currentThread isCancelled])
break;

string sha;
if (!getline(stream, sha, '\1'))
break;

// From now on, 1.2 seconds
string encoding_str;
getline(stream, encoding_str, '\1');
NSStringEncoding encoding = NSUTF8StringEncoding;
if (encoding_str.length())
{
if (encodingMap.find(encoding_str) != encodingMap.end()) {
encoding = encodingMap[encoding_str];
} else {
encoding = CFStringConvertEncodingToNSStringEncoding(CFStringConvertIANACharSetNameToEncoding((CFStringRef)[NSString stringWithUTF8String:encoding_str.c_str()]));
encodingMap[encoding_str] = encoding;
}
}

git_oid oid;
git_oid_mkstr(&oid, sha.c_str());
PBGitCommit *newCommit = [PBGitCommit commitWithRepository:repository andSha:[PBGitSHA shaWithOID:oid]];

string author;
getline(stream, author, '\1');

string committer;
getline(stream, committer, '\1');

string subject;
getline(stream, subject, '\1');

string parentString;
getline(stream, parentString, '\1');
if (parentString.size() != 0)
{
if (((parentString.size() + 1) % 41) != 0) {
NSLog(@"invalid parents: %zu", parentString.size());
continue;
}
int nParents = (parentString.size() + 1) / 41;
NSMutableArray *parents = [NSMutableArray arrayWithCapacity:nParents];
int parentIndex;
for (parentIndex = 0; parentIndex < nParents; ++parentIndex)
[parents addObject:[PBGitSHA shaWithCString:parentString.substr(parentIndex * 41, 40).c_str()]];

[newCommit setParents:parents];
}

int time;
stream >> time;

[newCommit setSubject:[NSString stringWithCString:subject.c_str() encoding:encoding]];
[newCommit setAuthor:[NSString stringWithCString:author.c_str() encoding:encoding]];
[newCommit setCommitter:[NSString stringWithCString:committer.c_str() encoding:encoding]];
[newCommit setTimestamp:time];

if (showSign)
{
char c;
stream >> c; // Remove separator
stream >> c;
if (c != '>' && c != '<' && c != '^' && c != '-')
NSLog(@"Error loading commits: sign not correct");
[newCommit setSign: c];
}

char c;
stream >> c;
if (c != '\0')
cout << "Error" << endl;

[revisions addObject: newCommit];
if (isGraphing)
[g decorateCommit:newCommit];

if (++num % 100 == 0) {
if ([[NSDate date] timeIntervalSinceDate:lastUpdate] > 0.1) {
NSDictionary *update = [NSDictionary dictionaryWithObjectsAndKeys:currentThread, kRevListThreadKey, revisions, kRevListRevisionsKey, nil];
[self performSelectorOnMainThread:@selector(updateCommits:) withObject:update waitUntilDone:NO];
revisions = [NSMutableArray array];
lastUpdate = [NSDate date];
}
}
}

if (![currentThread isCancelled]) {
NSTimeInterval duration = [[NSDate date] timeIntervalSinceDate:start];
NSLog(@"Loaded %i commits in %f seconds (%f/sec)", num, duration, num/duration);

// Make sure the commits are stored before exiting.
NSDictionary *update = [NSDictionary dictionaryWithObjectsAndKeys:currentThread, kRevListThreadKey, revisions, kRevListRevisionsKey, nil];
[self performSelectorOnMainThread:@selector(updateCommits:) withObject:update waitUntilDone:YES];

[self performSelectorOnMainThread:@selector(finishedParsing) withObject:nil waitUntilDone:NO];
}
else {
NSLog(@"[%@ %s] thread has been canceled", [self class], NSStringFromSelector(_cmd));
}

[task terminate];
[task waitUntilExit];
}

@end
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