package Code::TidyAll::SVN::Precommit;

use strict;
use warnings;

use Capture::Tiny qw(capture_stdout capture_stderr);
use Code::TidyAll::Util qw(tempdir_simple);
use Code::TidyAll;
use Log::Any qw($log);
use Path::Tiny qw(path);
use SVN::Look;
use Try::Tiny;

use Moo;

our $VERSION = '0.81';

# Public
has conf_name                => ( is => 'ro' );
has emergency_comment_prefix => ( is => 'ro', default => 'NO TIDYALL' );
has extra_conf_files         => ( is => 'ro', default => sub { [] } );
has reject_on_error          => ( is => 'ro' );
has repos                    => ( is => 'ro', default => sub { $ARGV[0] } );
has tidyall_class            => ( is => 'ro', default => 'Code::TidyAll' );
has tidyall_options          => ( is => 'ro', default => sub { {} } );
has txn                      => ( is => 'ro', default => sub { $ARGV[1] } );

# Private
has cat_file_cache => ( init_arg => undef, is => 'ro', default => sub { {} } );
has revlook        => ( init_arg => undef, is => 'lazy' );

sub _build_revlook {
    my $self = shift;
    return SVN::Look->new( $self->repos, '-t' => $self->txn );
}

sub check {
    my ( $class, %params ) = @_;

    my $fail_msg;

    try {
        my $self    = $class->new(%params);
        my $revlook = $self->revlook;

        # Skip if emergency comment prefix is present
        #
        if ( my $prefix = $self->emergency_comment_prefix ) {
            if ( index( $revlook->log_msg, $prefix ) == 0 ) {
                return;
            }
        }

        my @files = ( $self->revlook->added(), $self->revlook->updated() );
        $log->info('----------------------------');
        $log->infof(
            '%s [%s] repos = %s; txn = %s',
            scalar(localtime), $$, scalar( getpwuid($<) ),
            $self->repos,      $self->txn
        );
        $log->infof( 'looking at files: %s', join( ', ', @files ) );

        my %conf_files;
        foreach my $file (@files) {
            if ( my $conf_file = $self->find_conf_for_file($file) ) {
                my $root     = $conf_file->parent;
                my $rel_file = substr( $file, length($root) + 1 );
                $conf_files{$conf_file}->{$rel_file}++;
            }
            else {
                my $msg = sprintf( q{** could not find conf file upwards from '%s'}, $file );
                $log->error($msg);
                die $msg if $self->reject_on_error;
            }
        }

        my @results;
        for my $conf_file ( map { path($_) } keys %conf_files ) {
            my $file_map = $conf_files{$conf_file};

            my $root      = $conf_file->parent;
            my $conf_name = $conf_file->basename;
            $log->error("$root, $conf_file");
            my $tempdir = tempdir_simple();
            my @files   = keys(%$file_map);
            foreach my $rel_file ( $conf_name, @{ $self->extra_conf_files }, @files ) {

                # TODO: what if cat fails
                my $contents  = $self->cat_file( $root->child($rel_file) );
                my $full_path = $tempdir->child($rel_file);
                $full_path->parent->mkpath( { mode => 0755 } );
                $full_path->spew_raw($contents);
            }
            my $tidyall = $self->tidyall_class->new_from_conf_file(
                $tempdir->child($conf_name),
                no_cache   => 1,
                check_only => 1,
                mode       => 'commit',
                %{ $self->tidyall_options },
            );
            my $stdout = capture_stdout {
                push( @results, $tidyall->process_paths( map { $tempdir->child($_) } @files ) );
            };
            if ($stdout) {
                chomp($stdout);
                $log->info($stdout);
            }
        }

        if ( my @error_results = grep { $_->error } @results ) {
            my $error_count = scalar(@error_results);
            $fail_msg = join(
                "\n",
                sprintf(
                    '%d file%s did not pass tidyall check',
                    $error_count, $error_count > 1 ? 's' : q{}
                ),
                map { join( ': ', $_->path, $_->error ) } @error_results
            );
        }
    }
    catch {
        my $error = $_;
        $log->error($error);
        die $error if $params{reject_on_error};
    };
    die $fail_msg if $fail_msg;
}

sub find_conf_for_file {
    my ( $self, $file ) = @_;

    my @conf_names = $self->conf_name ? ( $self->conf_name ) : Code::TidyAll->default_conf_names;
    my $search_dir = $file->parent;
    my $cnt        = 0;
    while (1) {
        foreach my $conf_name (@conf_names) {
            my $conf_file = $search_dir->child($conf_name);
            return $conf_file if ( $self->cat_file($conf_file) );
        }
        if ( $search_dir eq '/' || $search_dir eq '' || $search_dir eq '.' ) {
            return undef;
        }
        else {
            $search_dir = $search_dir->parent;
        }
        die 'inf loop!' if ++$cnt > 100;
    }
}

sub cat_file {
    my ( $self, $file ) = @_;
    my $contents;
    if ( exists( $self->cat_file_cache->{$file} ) ) {
        $contents = $self->cat_file_cache->{$file};
    }
    else {
        try {
            capture_stderr { $contents = $self->revlook->cat($file) };
        }
        catch {
            $contents = '';
        };
        $self->cat_file_cache->{$file} = $contents;
    }
    return $contents;
}

1;

# ABSTRACT: Subversion pre-commit hook that requires files to be tidyall'd

__END__

=pod

=encoding UTF-8

=head1 NAME

Code::TidyAll::SVN::Precommit - Subversion pre-commit hook that requires files to be tidyall'd

=head1 VERSION

version 0.81

=head1 SYNOPSIS

  In hooks/pre-commit in your svn repo:

    #!/usr/bin/perl
    use Code::TidyAll::SVN::Precommit;
    use Log::Any::Adapter (File => '/path/to/hooks/logs/tidyall.log');
    use strict;
    use warnings;

    Code::TidyAll::SVN::Precommit->check();

=head1 DESCRIPTION

This module implements a L<Subversion pre-commit
hook|http://svnbook.red-bean.com/en/1.7/svn.ref.reposhooks.pre-commit.html>
that checks if all files are tidied and valid according to L<tidyall>, and
rejects the commit if not.

=head1 METHODS

This class provides the following methods:

=head1 Code::TidyAll::SVN::Precommit->check(%params)

Check that all files being added or modified in this commit are tidied and
valid according to L<tidyall>. If not, then the entire commit is rejected and
the reason(s) are output to the client. e.g.

    % svn commit -m "fixups" CHI.pm CHI/Driver.pm
    Sending        CHI/Driver.pm
    Sending        CHI.pm
    Transmitting file data ..svn: Commit failed (details follow):
    svn: Commit blocked by pre-commit hook (exit code 255) with output:
    2 files did not pass tidyall check
    lib/CHI.pm: *** 'PerlTidy': needs tidying
    lib/CHI/Driver.pm: *** 'PerlCritic': Code before strictures are enabled
      at /tmp/Code-TidyAll-0e6K/Driver.pm line 2
      [TestingAndDebugging::RequireUseStrict]

In an emergency the hook can be bypassed by prefixing the comment with "NO
TIDYALL", e.g.

    % svn commit -m "NO TIDYALL - this is an emergency!" CHI.pm CHI/Driver.pm
    Sending        CHI/Driver.pm
    Sending        CHI.pm
    Transmitting file data .
    Committed revision 7562.

The configuration file (C<tidyall.ini> or C<.tidyallrc>) must be checked into
svn. For each file, the hook will look upwards from the file's repo location
and use the first configuration file it finds.

By default, if the configuration file cannot be found, or if a runtime error
occurs, a warning is logged (see L</LOGGING> below) but the commit is allowed
to proceed. This is so that unexpected problems do not prevent valid commits.

Passes mode = "commit" by default; see L<modes|tidyall/MODES>.

Key/value parameters:

=over 4

=item * conf_name

Conf file name to search for instead of the defaults.

=item * emergency_comment_prefix

Commit prefix that will cause this hook to be bypassed. Defaults to "NO
TIDYALL". e.g.

    svn commit -m "NO TIDYALL - must get fix to production!"

Set to a false value (e.g. blank or undefined) to disable bypassing.

=item * extra_conf_files

A listref of other configuration files referred to from the main configuration
file, e.g.

    extra_conf_files => ['perlcriticrc', 'perltidyrc']

If you don't list them here then you'll get errors like 'cannot find
perlcriticrc' when the hook runs.

=item * reject_on_error

If the configuration file cannot be found for some/all the files, or if a
runtime error occurs, reject the commit.

=item * repos

Repository path being committed; defaults to C<< $ARGV[0] >>

=item * tidyall_class

Subclass to use instead of L<Code::TidyAll>

=item * tidyall_options

Hashref of options to pass to the L<Code::TidyAll> constructor

=item * txn

Commit transaction; defaults to C<< $ARGV[1] >>

=back

=head1 LOGGING

This module uses L<Log::Any> to log its activity, including all files that were
checked, an inability to find the configuration file, and any runtime errors
that occur. You can create a simple date-stamped log file with

    use Log::Any::Adapter (File => "/path/to/hooks/logs/tidyall.log");

or do something fancier with one of the other L<Log::Any
adapters|Log::Any::Adapter>.

Having a log file is especially useful with pre-commit hooks since there is no
way for the hook to send back output on a successful commit.

=head1 ACKNOWLEDGMENTS

Thanks to Alexander Simakov, author of
L<perlcritic-checker|http://search.cpan.org/~xdr/perlcritic-checker-1.2.6/>,
for some of the ideas here such as emergency_comment_prefix.

=head1 SUPPORT

Bugs may be submitted at L<https://github.com/houseabsolute/perl-code-tidyall/issues>.

=head1 SOURCE

The source code repository for Code-TidyAll can be found at L<https://github.com/houseabsolute/perl-code-tidyall>.

=head1 AUTHORS

=over 4

=item *

Jonathan Swartz <swartz@pobox.com>

=item *

Dave Rolsky <autarch@urth.org>

=back

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2011 - 2022 by Jonathan Swartz.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

The full text of the license can be found in the
F<LICENSE> file included with this distribution.

=cut
