package SQL::Translator::Producer::HTML;

# -------------------------------------------------------------------
# $Id: HTML.pm 1445 2009-02-07 17:50:03Z ashberlin $
# -------------------------------------------------------------------
# Copyright (C) 2002-2009 SQLFairy Authors
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; version 2.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
# 02111-1307  USA
# -------------------------------------------------------------------

use strict;
use Data::Dumper;
use vars qw($NOWRAP $NOLINKTABLE $NAME);

$NAME = __PACKAGE__;
$NOWRAP = 0 unless defined $NOWRAP;
$NOLINKTABLE = 0 unless defined $NOLINKTABLE;

# Emit XHTML by default
$CGI::XHTML = $CGI::XHTML = 42;

use SQL::Translator::Schema::Constants;

# -------------------------------------------------------------------
# Main entry point.  Returns a string containing HTML.
# -------------------------------------------------------------------
sub produce {
    my $t           = shift;
    my $args        = $t->producer_args;
    my $schema      = $t->schema;
    my $schema_name = $schema->name || 'Schema';
    my $title       = $args->{'title'} || "Description of $schema_name";
    my $wrap        = ! (defined $args->{'nowrap'}
                               ? $args->{'nowrap'}
                               : $NOWRAP);
    my $linktable   = ! (defined $args->{'nolinktable'}
                               ? $args->{'nolinktable'}
                               : $NOLINKTABLE);
    my %stylesheet  = defined $args->{'stylesheet'}
                    ? ( -style => { src => $args->{'stylesheet'} } )
                    : ( );
    my @html;
    my $q           = defined $args->{'pretty'}
                    ? do { require CGI::Pretty;
                            import CGI::Pretty;
                                   CGI::Pretty->new }
                    : do { require CGI;
                            import CGI; 
                                   CGI->new };
    my ($table, @table_names);

    if ($wrap) {
        push @html,
            $q->start_html({
                -title => $title,
                %stylesheet,
                -meta => { generator => $NAME },
            }),
            $q->h1({ -class => 'SchemaDescription' }, $title),
            $q->hr;
    }

    @table_names = grep { length $_->name } $schema->get_tables; 

    if ($linktable) {
        # Generate top menu, with links to full table information
        my $count = scalar(@table_names);
        $count = sprintf "%d table%s", $count, $count == 1 ? '' : 's';

        # Leading table of links
        push @html, 
            $q->comment("Table listing ($count)"),
            $q->a({ -name => 'top' }),
            $q->start_table({ -width => '100%', -class => 'LinkTable'}),

            # XXX This needs to be colspan="$#{$table->fields}" class="LinkTableHeader"
            $q->Tr(
                $q->td({ -class => 'LinkTableCell' },
                    $q->h2({ -class => 'LinkTableTitle' },
                        'Tables'
                    ),
                ),
            );

        for my $table (@table_names) {
            my $table_name = $table->name;
            push @html, 
                $q->comment("Start link to table '$table_name'"),
                $q->Tr({ -class => 'LinkTableRow' },
                    $q->td({ -class => 'LinkTableCell' },
                        qq[<a id="${table_name}-link" href="#$table_name">$table_name</a>]
                    )
                ),
                $q->comment("End link to table '$table_name'");
        }
        push @html, $q->end_table;
    }

    for my $table ($schema->get_tables) {
        my $table_name = $table->name       or next;
        my @fields     = $table->get_fields or next;
        push @html,
            $q->comment("Starting table '$table_name'"),
            $q->a({ -name => $table_name }),
            $q->table({ -class => 'TableHeader', -width => '100%' },
                $q->Tr({ -class => 'TableHeaderRow' },
                    $q->td({ -class => 'TableHeaderCell' }, $q->h3($table_name)),
                        qq[<a name="$table_name">],
                    $q->td({ -class => 'TableHeaderCell', -align => 'right' },
                        qq[<a href="#top">Top</a>]
                    )
                )
            );

        if ( my @comments = map { $_ ? $_ : () } $table->comments ) {
            push @html,
                $q->b("Comments:"),
                    $q->br,
                    $q->em(map { $q->br, $_ } @comments);
        }

        #
        # Fields
        #
        push @html,
            $q->start_table({ -border => 1 }),
                $q->Tr(
                    $q->th({ -class => 'FieldHeader' },
                           [ 
                            'Field Name', 
                            'Data Type', 
                            'Size', 
                            'Default Value', 
                            'Other', 
                            'Foreign Key' 
                           ]
                    ) 
                );

        my $i = 0;
        for my $field ( @fields ) {
            my $name      = $field->name      || '';
               $name      = qq[<a name="$table_name-$name">$name</a>];
            my $data_type = $field->data_type || '';
            my $size      = defined $field->size ? $field->size : '';
            my $default   = defined $field->default_value 
                            ? $field->default_value : '';
            my $comment   = $field->comments  || '';
            my $fk        = '';

            if ($field->is_foreign_key) {
                my $c         = $field->foreign_key_reference;
                my $ref_table = $c->reference_table       || '';
                my $ref_field = ($c->reference_fields)[0] || '';
                $fk           = 
                qq[<a href="#$ref_table-$ref_field">$ref_table.$ref_field</a>];
            }

            my @other = ();
            push @other, 'PRIMARY KEY' if $field->is_primary_key;
            push @other, 'UNIQUE'      if $field->is_unique;
            push @other, 'NOT NULL'    unless $field->is_nullable;
            push @other, $comment      if $comment;
            my $class = $i++ % 2 ? 'even' : 'odd';
            push @html,
                $q->Tr(
                    { -class => "tr-$class" },
                    $q->td({ -class => "FieldCellName" }, $name),
                    $q->td({ -class => "FieldCellType" }, $data_type),
                    $q->td({ -class => "FieldCellSize" }, $size),
                    $q->td({ -class => "FieldCellDefault" }, $default),
                    $q->td({ -class => "FieldCellOther" }, join(', ', @other)),
                    $q->td({ -class => "FieldCellFK" }, $fk),
                );
        }
        push @html, $q->end_table;

        #
        # Indices
        #
        if ( my @indices = $table->get_indices ) {
            push @html, 
                $q->h3('Indices'),
                $q->start_table({ -border => 1 }),
                    $q->Tr({ -class => 'IndexRow' },
                        $q->th([ 'Name', 'Fields' ]) 
                    );

            for my $index ( @indices ) {
                my $name   = $index->name || '';
                my $fields = join( ', ', $index->fields ) || '';

                push @html,
                    $q->Tr({ -class => 'IndexCell' },
                        $q->td( [ $name, $fields ] )
                    );
            }

            push @html, $q->end_table;
        }

        #
        # Constraints
        #
        my @constraints = 
            grep { $_->type ne PRIMARY_KEY } $table->get_constraints;
        if ( @constraints ) {
            push @html, 
                $q->h3('Constraints'),
                $q->start_table({ -border => 1 }),
                    $q->Tr({ -class => 'IndexRow' },
                        $q->th([ 'Type', 'Fields' ]) 
                    );

            for my $c ( @constraints ) {
                my $type   = $c->type || '';
                my $fields = join( ', ', $c->fields ) || '';

                push @html,
                    $q->Tr({ -class => 'IndexCell' },
                        $q->td( [ $type, $fields ] )
                    );
            }

            push @html, $q->end_table;
        }

        push @html, $q->hr;
    }

    my $sqlt_version = $t->version;
    if ($wrap) {
        push @html,
            qq[Created by <a href="http://sqlfairy.sourceforge.net">],
            qq[SQL::Translator $sqlt_version</a>],
            $q->end_html;
    }


    return join "\n", @html;
}

1;

# -------------------------------------------------------------------
# Always be ready to speak your mind,
# and a base man will avoid you.
# William Blake
# -------------------------------------------------------------------

=head1 NAME

SQL::Translator::Producer::HTML - HTML producer for SQL::Translator

=head1 SYNOPSIS

  use SQL::Translator::Producer::HTML;

=head1 DESCRIPTION

Creates an HTML document describing the tables.

The HTML produced is composed of a number of tables:

=over 4

=item Links

A link table sits at the top of the output, and contains anchored
links to elements in the rest of the document.

If the I<nolinktable> producer arg is present, then this table is not
produced.

=item Tables

Each table in the schema has its own HTML table.  The top row is a row
of E<lt>thE<gt> elements, with a class of B<FieldHeader>; these
elements are I<Field Name>, I<Data Type>, I<Size>, I<Default Value>,
I<Other> and I<Foreign Key>.  Each successive row describes one field
in the table, and has a class of B<FieldCell$item>, where $item id
corresponds to the label of the column.  For example:

    <tr>
        <td class="FieldCellName"><a name="random-id">id</a></td>
        <td class="FieldCellType">int</td>
        <td class="FieldCellSize">11</td>
        <td class="FieldCellDefault"></td>
        <td class="FieldCellOther">PRIMARY KEY, NOT NULL</td>
        <td class="FieldCellFK"></td>
    </tr>

    <tr>
        <td class="FieldCellName"><a name="random-foo">foo</a></td>
        <td class="FieldCellType">varchar</td>
        <td class="FieldCellSize">255</td>
        <td class="FieldCellDefault"></td>
        <td class="FieldCellOther">NOT NULL</td>
        <td class="FieldCellFK"></td>
    </tr>

    <tr>
        <td class="FieldCellName"><a name="random-updated">updated</a></td>
        <td class="FieldCellType">timestamp</td>
        <td class="FieldCellSize">0</td>
        <td class="FieldCellDefault"></td>
        <td class="FieldCellOther"></td>
        <td class="FieldCellFK"></td>
    </tr>

=back

Unless the I<nowrap> producer arg is present, the HTML will be
enclosed in a basic HTML header and footer.

If the I<pretty> producer arg is present, the generated HTML will be
nicely spaced and human-readable.  Otherwise, it will have very little
insignificant whitespace and be generally smaller.


=head1 AUTHORS

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

=cut
