# Copyright © 2010 Julian Blake Kongslie <jblake@omgwallhack.org>
# Licensed under the BSD 3-clause license.

package Piny::Repo;

use Moose;
use Moose::Util::TypeConstraints;

use File::Find qw( find );

use IkiWiki::FakeSetup qw( readSetup writeSetup );

use Piny::Group;
use Piny::User;

# Types

subtype 'Reponame'
  => as 'Str'
  => where { $_ =~ /^[a-zA-Z0-9][a-zA-Z0-9_.-]*$/ }
  => message { 'That name is not in the correct format for a piny repo.' }
  ;

subtype 'SimpleText'
  => as 'Str'
  => where { $_ =~ /^[\x{0020}-\x{FDCF}\x{FDF0}-\x{FFFD}]{1,80}$/ }
  => message { 'That description is not in the correct format for a piny repo.' }
  ;

# Attributes

has 'name' =>
  ( is        => 'rw'
  , isa       => 'Reponame'
  , trigger   => \&_rename_repo
  , required  => 1
  );

has 'group' =>
  ( is          => 'ro'
  , isa         => 'Piny::Group'
  , lazy_build  => 1
  , init_arg    => undef
  );

has 'path' =>
  ( is          => 'ro'
  , isa         => 'Str'
  , lazy_build  => 1
  , init_arg    => undef
  );

has 'description' =>
  ( is          => 'rw'
  , isa         => 'SimpleText'
  , trigger     => \&_set_description
  , lazy_build  => 1
  , init_arg    => undef
  );

has 'repostat' =>
  ( is          => 'ro'
  , isa         => 'ArrayRef'
  , lazy_build  => 1
  , init_arg    => undef
  );

has 'owner' =>
  ( is          => 'rw'
  , isa         => 'Piny::User'
  , trigger     => \&_change_owner
  , lazy_build  => 1
  , init_arg    => undef
  );

has 'globally_readable' =>
  ( is          => 'ro'
  , isa         => 'Bool'
  , lazy_build  => 1
  , init_arg    => undef
  );

has 'globally_writable' =>
  ( is          => 'ro'
  , isa         => 'Bool'
  , lazy_build  => 1
  , init_arg    => undef
  );

has 'ikiwiki_setup' =>
  ( is          => 'ro'
  , isa         => 'Str'
  , lazy_build  => 1
  , init_arg    => undef
  );

has 'ikiwiki_destdir' =>
  ( is          => 'ro'
  , isa         => 'Str'
  , lazy_build  => 1
  , init_arg    => undef
  );

has 'ikiwiki_srcdir' =>
  ( is          => 'ro'
  , isa         => 'Str'
  , lazy_build  => 1
  , init_arg    => undef
  );

has 'ikiwiki_url' =>
  ( is          => 'ro'
  , isa         => 'Str'
  , lazy_build  => 1
  , init_arg    => undef
  );

has 'ikiwiki_cgiurl' =>
  ( is          => 'ro'
  , isa         => 'Str'
  , lazy_build  => 1
  , init_arg    => undef
  );

has 'ikiwiki_historyurl' =>
  ( is          => 'ro'
  , isa         => 'Str'
  , lazy_build  => 1
  , init_arg    => undef
  );

has 'ikiwiki_diffurl' =>
  ( is          => 'ro'
  , isa         => 'Str'
  , lazy_build  => 1
  , init_arg    => undef
  );

has 'ikiwiki_cgipath' =>
  ( is          => 'ro'
  , isa         => 'Str'
  , lazy_build  => 1
  , init_arg    => undef
  );

has 'secure_path' =>
  ( is          => 'ro'
  , isa         => 'Str'
  , lazy_build  => 1
  , init_arg    => undef
  );

has 'apache_config' =>
  ( is          => 'ro'
  , isa         => 'Str'
  , lazy_build  => 1
  , init_arg    => undef
  );

# Public methods

sub add_access {
  my ( $s, @users ) = @_;

  $s->group->add_member( @users );
};

sub remove_access {
  my ( $s, @users ) = @_;

  $s->group->remove_member( @users );
};

sub has_access {
  my ( $s, $user ) = @_;

  return $s->owner->uid == $user->uid || $user->has_group( $s->group );
};

# Triggers

sub _rename_repo {
  my ( $s, $new_name, $old_name ) = @_;

  return unless defined $old_name;

  my $olddir = "/srv/git/$old_name.git";
  my $newdir = "/srv/git/$new_name.git";

  rename( $olddir, $newdir ) or die "Couldn't rename $olddir to $newdir: $!";

  warn "XXX Not renaming all the ikiwiki stuff!";

  $s->clear_path;
  $s->clear_ikiwiki_setup;
  $s->clear_ikiwiki_destdir;
  $s->clear_ikiwiki_srcdir;
  $s->clear_ikiwiki_url;
  $s->clear_ikiwiki_cgiurl;
  $s->clear_ikiwiki_historyurl;
  $s->clear_ikiwiki_cgipath;
  $s->clear_secure_path;
  $s->clear_apache_config;
};

sub _set_description {
  my ( $s, $new_description, $old_description ) = @_;

  return unless defined $old_description;

  open( my $fd, ">", $s->path . "/description" ) or die "Unable to open " . $s->path . "/description for writing: $!";
  print $fd $new_description;
  close( $fd ) or die "Error when closing " . $s->path . "/description: $!";
};

sub _change_owner {
  my ( $s, $new_owner, $old_owner ) = @_;

  return unless defined $old_owner;

  find( { wanted => sub { chown( $new_owner->uid, -1, $_ ) or die "Couldn't chown $_: $!"; }, no_chdir => 1 }, $s->path );

  $s->clear_ikiwiki_setup;
};

# Class methods

sub all_repos {
  my ( $class, $dir ) = @_;

  $dir = "/srv/git" unless defined $dir;

  my @ret;

  find( { wanted => sub { if ( /^[^.].*\.git$/ ) { $File::Find::prune = 1; push( @ret, $File::Find::name ); }; } }, $dir );

  @ret = map { s/^\Q$dir\E\/?//; s/\.git$//; $class->new( name => $_ ); } @ret;

  return @ret;
};

# Builder methods

# If constructed with just one argument, then treat it as a repo name.
around BUILDARGS => sub {
  my ( $orig, $class ) = ( shift, shift );

  if ( @_ == 1 && ! ref $_[0] ) {
    return $class->$orig( name => $_[0] );
  } else {
    return $class->$orig( @_ );
  };
};

sub _build_group {
  my ( $s ) = @_;

  return Piny::Group->new( name => "git-" . $s->name );
};

sub _build_path {
  my ( $s ) = @_;

  my $dir = "/srv/git/" . $s->name . ".git";

  if ( -d $dir ) {
    return $dir;
  } else {
    die "Expected repo $dir does not exist!";
  };
};

sub _build_description {
  my ( $s ) = @_;

  open( my $d, "<", $s->path . "/description" ) or die "Unable to open " . $s->path . "/description: $!";
  my $desc;
  {
    local $/ = undef;
    $desc = <$d>;
  };
  close( $d );

  return $desc;
};

sub _build_repostat {
  my ( $s ) = @_;

  my @res = stat( $s->path );
  die "stat( " . $s->path . " ) failed: $!" unless @res;
  return \@res;
};

sub _build_owner {
  my ( $s ) = @_;

  my ( $uid ) = $s->repostat->[4];

  return Piny::User->new( uid => $uid );
};

sub _build_globally_readable {
  my ( $s ) = @_;

  return ( $s->repostat->[2] & 0444 ) == 0444;
};

sub _build_globally_writable {
  my ( $s ) = @_;

  return ( $s->repostat->[2] & 0111 ) == 0111;
};

sub _build_ikiwiki_setup {
  my ( $s ) = @_;

  my ( $package, $config ) = readSetup( "/usr/share/libpiny/ikiwiki.setup" );

  $config->{"wikiname"}   = $s->name;
  $config->{"adminemail"} = $s->owner->email;
  $config->{"srcdir"}     = $s->ikiwiki_srcdir;
  $config->{"destdir"}    = $s->ikiwiki_destdir;
  $config->{"url"}        = $s->ikiwiki_url;
  $config->{"cgiurl"}     = $s->ikiwiki_cgiurl;
  $config->{"historyurl"} = $s->ikiwiki_historyurl;
  $config->{"diffurl"}    = $s->ikiwiki_diffurl;

  $config->{"wrappers"} =
    [ { "wrapper"       => $s->ikiwiki_cgipath
      , "wrappergroup"  => $s->group->name
      , "wrappermode"   => 06755
      , "cgi"           => 1
      }
    , { "wrapper"       => $s->path . "/hooks/post-update"
      , "wrappergroup"  => $s->group->name
      , "wrappermode"   => 06755
      , "notify"        => 0
      }
    ];

  return writeSetup( $package, $config );
};

sub _build_ikiwiki_destdir {
  my ( $s ) = @_;

  my $dir = "/srv/www/piny.be/" . $s->name;

  if ( -d $dir ) {
    return $dir;
  } else {
    die "Expected destdir $dir does not exist!";
  };
};

sub _build_ikiwiki_srcdir {
  my ( $s ) = @_;

  my $dir = "/srv/ikiwiki/" . $s->name;

  if ( -d $dir ) {
    return $dir;
  } else {
    die "Expected srcdir $dir does not exist!";
  };
};

sub _build_ikiwiki_url {
  my ( $s ) = @_;

  return "http://piny.be/" . $s->name;
};

sub _build_ikiwiki_cgiurl {
  my ( $s ) = @_;

  return "https://secure.piny.be/repos/" . $s->name . "/ikiwiki.cgi";
};

sub _build_secure_path {
  my ( $s ) = @_;

  return "/srv/www/secure.piny.be/repos/" . $s->name;
};

sub _build_ikiwiki_cgipath {
  my ( $s ) = @_;

  return $s->secure_path . "/ikiwiki.cgi";
};

sub _build_ikiwiki_historyurl {
  my ( $s ) = @_;

  return "https://secure.piny.be/cgit/" . $s->name . "/log/[[file]]";
};

sub _build_ikiwiki_diffurl {
  my ( $s ) = @_;

  return "https://secure.piny.be/cgit/" . $s->name . "/diff/?id=[[sha1_commit]]";
};

sub _build_apache_config {
  my ( $s ) = @_;

  return "<Directory " . $s->secure_path . ">\n  AuthPAM_Enabled on\n  AuthGROUP_Enabled on\n  AuthPAM_FallThrough off\n  AuthBasicAuthoritative off\n  AuthType Basic\n  AuthName \"User access to " . $s->name . " repository needed.\"\n  Require group " . $s->group->name . "\n</Directory>\n";
};

# Moose boilerplate

__PACKAGE__->meta->make_immutable;

1;