package SQL::Translator::Parser::YAML;

use strict;
use warnings;
our $VERSION = '1.66';

use SQL::Translator::Schema;
use SQL::Translator::Utils qw(header_comment);
use Data::Dumper;
use YAML qw(Load);

sub parse {
  my ($translator, $data) = @_;
  $data = Load($data);
  $data = $data->{'schema'};

  warn "YAML data:", Dumper($data) if $translator->debug;

  my $schema = $translator->schema;

  #
  # Tables
  #
  my @tables = map { $data->{'tables'}{ $_->[1] } }
      sort { $a->[0] <=> $b->[0] }
      map  { [ $data->{'tables'}{$_}{'order'} || 0, $_ ] }
      keys %{ $data->{'tables'} };

  for my $tdata (@tables) {

    my $table = $schema->add_table(map { $tdata->{$_} ? ($_ => $tdata->{$_}) : () } (qw/name extra options/))
        or die $schema->error;

    my @fields = map { $tdata->{'fields'}{ $_->[1] } }
        sort { $a->[0] <=> $b->[0] }
        map  { [ $tdata->{'fields'}{$_}{'order'}, $_ ] }
        keys %{ $tdata->{'fields'} };

    for my $fdata (@fields) {
      $table->add_field(%$fdata) or die $table->error;
      $table->primary_key($fdata->{'name'})
          if $fdata->{'is_primary_key'};
    }

    for my $idata (@{ $tdata->{'indices'} || [] }) {
      $table->add_index(%$idata) or die $table->error;
    }

    for my $cdata (@{ $tdata->{'constraints'} || [] }) {
      $table->add_constraint(%$cdata) or die $table->error;
    }

    $table->comments($tdata->{'comments'})
        if exists $tdata->{'comments'};
  }

  #
  # Views
  #
  my @views = map { $data->{'views'}{ $_->[1] } }
      sort { $a->[0] <=> $b->[0] }
      map  { [ $data->{'views'}{$_}{'order'}, $_ ] }
      keys %{ $data->{'views'} };

  for my $vdata (@views) {
    $schema->add_view(%$vdata) or die $schema->error;
  }

  #
  # Triggers
  #
  my @triggers = map { $data->{'triggers'}{ $_->[1] } }
      sort { $a->[0] <=> $b->[0] }
      map  { [ $data->{'triggers'}{$_}{'order'}, $_ ] }
      keys %{ $data->{'triggers'} };

  for my $tdata (@triggers) {
    $schema->add_trigger(%$tdata) or die $schema->error;
  }

  #
  # Procedures
  #
  my @procedures = map { $data->{'procedures'}{ $_->[1] } }
      sort { $a->[0] <=> $b->[0] }
      map  { [ $data->{'procedures'}{$_}{'order'}, $_ ] }
      keys %{ $data->{'procedures'} };

  for my $tdata (@procedures) {
    $schema->add_procedure(%$tdata) or die $schema->error;
  }

  if (my $tr_data = $data->{'translator'}) {
    $translator->add_drop_table($tr_data->{'add_drop_table'});
    $translator->filename($tr_data->{'filename'});
    $translator->no_comments($tr_data->{'no_comments'});
    $translator->parser_args($tr_data->{'parser_args'});
    $translator->producer_args($tr_data->{'producer_args'});
    $translator->parser_type($tr_data->{'parser_type'});
    $translator->producer_type($tr_data->{'producer_type'});
    $translator->show_warnings($tr_data->{'show_warnings'});
    $translator->trace($tr_data->{'trace'});
  }

  return 1;
}

1;

__END__

=head1 NAME

SQL::Translator::Parser::YAML - Parse a YAML representation of a schema

=head1 SYNOPSIS

    use SQL::Translator;

    my $translator = SQL::Translator->new(parser => "YAML");

=head1 DESCRIPTION

C<SQL::Translator::Parser::YAML> parses a schema serialized with YAML.

=head1 AUTHORS

Darren Chamberlain E<lt>darren@cpan.orgE<gt>,
Ken Y. Clark E<lt>kclark@cpan.orgE<gt>.
