#!/usr/bin/perl

use strict;
use warnings;

use Getopt::Long qw(GetOptions);
use Log::Log4perl qw(:easy);
# TODO: This needs to be scoped properly
use lib "/usr/local/lib";
use SimplyGit::Shellex qw(shellex findBin);
use SimplyGit::Git qw(readConfig getStatus returnState addFiles commitChanges pushChanges stashAndReset resetFromUpstream updateGitIgnore);

# TODO: This should maybe be more robust?
if ( ! -d ".git" ) {
	print "Not a git dir, exiting...\n";
	exit 1;
}

sub initSG($) {

	my $sgDir = shift;
	my $pwdCmd = findBin("pwd");
	my $pwd = shellex($pwdCmd);
	chomp $pwd;
	my $path = $pwd . "/" . $sgDir;
	my $logFile = $pwd . "/" . $sgDir . "/" . "sgLog.txt";
	if ( ! -d $path ) {
		print "Creating $path\n";
		shellex("mkdir $path");
	}

	if ( ! -f $logFile ) {
		print "Creating $logFile\n";
		shellex("touch $logFile");
	}

	return ( $path, $logFile );
	
}

my ( $sgPath, $sgLogFile ) = initSG(".sg");
sub getLogName { return $sgLogFile; };
my $log_conf = q(
        log4perl.rootLogger              = ERROR, LOG1
        log4perl.appender.LOG1           = Log::Log4perl::Appender::File
        log4perl.appender.LOG1.filename  = sub { getLogName(); }
        log4perl.appender.LOG1.mode      = append
        log4perl.appender.LOG1.layout    = Log::Log4perl::Layout::PatternLayout
        log4perl.appender.LOG1.layout.ConversionPattern = %d %p %m %n
);

Log::Log4perl::init(\$log_conf);
my $logger = get_logger();
my $gitCmd = findBin("git",$logger);
# Create or append to .gitignore so that we don't push the log
# Maybe this should be an opt?
updateGitIgnore(".","/.sg",$logger);

my %args;
GetOptions(
	\%args,
	'push-all',
	'interactive',
	'view',
	'reset-from-master',
	'reset-from-upstream',
	'branch-from-master',
	'commit-msg=s',
	'dump-config',
);

sub printHelp {

	my $help = <<EOF
simply-git
Usage:
	--view
	Display git status of files and other information

	--dump-config
	Dump .git/config to STDOUT. Not really useful but exposed for testing of reading config into internal data structure

	--push-all [--commit-msg]
	Push all untracked and modified files 
		* (can be used with interactive mode)
		* can provide a commit msg with --commit-msg (otherwise a generic will be provided)

	--interactive
	Enable interactive mode with supported opts

	--reset-from-master
	Reset all current changes so that the file tree matches upstream/master

	--branch-from-master
	Create a new clean branch from upstream/master
EOF
;

	print "$help\n";

}

if ( scalar keys %args < 1 ) {
	printHelp();
}


# This functionality is mainly here to test building out Git.pm, and doesn't really offer anything that regular git doesn't
if ( defined $args{'view'} ) {
	my ( $untrackedRef, $modifiedRef, $addedRef, $deletedRef ) = returnState($logger);
	my $refs = shellex("$gitCmd show-ref",$logger);
	my $branch = shellex("$gitCmd show-branch",$logger);
	print "On [branch] @ commit: $branch";
	print "$refs\n";
	my $swpWarning = "\t# Likely a Vi .swp file";

	my $untrackedTotal = scalar @$untrackedRef;
	print "* $untrackedTotal untracked file(s):\n";
	foreach my $file ( @$untrackedRef ) {
		if ( $file =~ m/.swp/ ) {
			print "\t$file $swpWarning\n";
		} else {
			print "\t$file\n";
		}
	}

	my $modifiedTotal = scalar @$modifiedRef;
	print "* $modifiedTotal modified file(s):\n";
	foreach my $file ( @$modifiedRef ) {
		if ( $file =~ m/.swp/ ) {
			print "\t$file $swpWarning\n";
		} else {
			print "\t$file\n";
		}
	}

	my $commitTotal = scalar @$addedRef;
	print "* $commitTotal file(s) added to commit:\n";
	foreach my $file ( @$addedRef ) {
		if ( $file =~ m/.swp/ ) {
			print "\t$file $swpWarning\n";
		} else {
			print "\t$file\n";
		}
	}

	my $deletedTotal = scalar @$deletedRef;
	print "* $deletedTotal file(s) to be deleted from commit:\n";
	foreach my $file ( @$deletedRef ) {
		if ( $file =~ m/.swp/ ) {
			print "\t$file $swpWarning\n";
		} else {
			print "\t$file\n";
		}
	}
}

###
# TODO: This args processing is dangerous and incomplete, need to write an args processor function
###

# This functionality is mainly here to test building out Git.pm, and doesn't really offer anything that regular git doesn't
if ( defined $args{'push-all'} ) {

	my ( $untrackedRef, $modifiedRef ) = returnState($logger);
	my @files;
	push(@files,@$untrackedRef); push(@files,@$modifiedRef);
	my @filesToCommit;
	if ( defined $args{'interactive'} ) {
		foreach my $file ( @files ) {
			print "Add $file to commit (y/n): ";
			my $input = <STDIN>;
			chomp $input;
			if ( $input =~ m/^Y|^y/ ) {
				push(@filesToCommit,$file);
			} else {
				next;
			}
		}

	} else {
		@filesToCommit = @files;
	}
		
	print "Commiting the following files:\n";
	foreach my $file ( @filesToCommit ) {
		print "\t$file\n";
	}

	if ( defined $args{'interactive'} ) {
		print "Does this look correct (y/n) : ";
		my $input = <STDIN>;
		chomp $input;
		if ( $input !~ m/^Y|^y/ ) {
			print "Canceling...\n";
			exit 1;
		}
	}
	
	addFiles(\@filesToCommit,$logger);

	if ( defined $args{'interactive'} && ! defined $args{'commit-msg'}) {
		print "Enter a commit message: ";
		my $input = <STDIN>;
		chomp $input;
		commitChanges($input,$logger);
	} elsif ( defined $args{'commit-msg'} ) { 
		my $commitMsg = "$args{'commit-msg'}";
		commitChanges($commitMsg,$logger);
	} else {
		my $epoch = time();
		my $commitMsg = "Generic Commit at $epoch";
		commitChanges($commitMsg,$logger);
	}

	if ( defined $args{'interactive'} ) {
		print "Push changes? (y/n): ";
		my $input = <STDIN>;
		chomp $input;
		if ( $input !~ m/^Y|^y/ ) {
			# TODO: Unstage changes?
			print "Canceling...\n";
			exit 1;
		}

		my $gitOutput = pushChanges($logger);
		print "Git returned:\n$gitOutput";

	} else {

		pushChanges($logger);
		my $gitOutput = pushChanges($logger);
		print "Git returned:\n$gitOutput";

	}


}

if ( defined $args{'reset-from-master'} ) {

	stashAndReset($logger);

}

if ( defined $args{'reset-from-upstream'} ) {

	print "This does nothing right now\n";
	resetFromUpstream($logger);

}

if ( defined $args{'dump-config'} ) {

	my %configHash = readConfig(".",$logger);
	foreach my $key ( keys %configHash ) {
		my $hRef = $configHash{$key};
		print "[$key]\n";
		foreach my $ckey ( keys %$hRef ) {
			print "\t$ckey = ${$hRef}{$ckey}\n";
		}
	}

}