package DBIx::Custom::Result;

use strict;
use warnings;

use base 'Object::Simple';
use Carp 'croak';

__PACKAGE__->attr([qw/_dbi sth fetch_filter/]);
__PACKAGE__->attr(_no_fetch_filters => sub { {} });

sub new {
    my $self = shift->SUPER::new(@_);
    
    # Initialize attributes
    $self->no_fetch_filters($self->{no_fetch_filters})
      if exists $self->{no_fetch_filters};
    
    return $self;
}

sub no_fetch_filters {
    my $self = shift;
    
    if (@_) {
        
        # Set
        $self->{no_fetch_filters} = $_[0];
        
        # Cached
        my %no_fetch_filters = map {$_ => 1} @{$self->{no_fetch_filters}};
        $self->_no_fetch_filters(\%no_fetch_filters);
        
        return $self;
    }
    
    return $self->{no_fetch_filters};
}

sub fetch {
    my ($self, $type) = @_;
    my $sth = $self->sth;
    my $fetch_filter = $self->fetch_filter;
    
    # Fetch
    my $row = $sth->fetchrow_arrayref;
    
    # Cannot fetch
    return unless $row;
    
    # Filter
    if ($fetch_filter) {
        my $keys  = $sth->{NAME_lc};
        my $types = $sth->{TYPE};
        for (my $i = 0; $i < @$keys; $i++) {
            next if $self->_no_fetch_filters->{$keys->[$i]};
            $row->[$i]= $fetch_filter->($row->[$i], $keys->[$i], $self->_dbi,
                                        {type => $types->[$i], sth => $sth, index => $i});
        }
    }
    return wantarray ? @$row : $row;
}

sub fetch_hash {
    my $self = shift;
    my $sth = $self->sth;
    my $fetch_filter = $self->fetch_filter;
    
    # Fetch
    my $row = $sth->fetchrow_arrayref;
    
    # Cannot fetch
    return unless $row;
    
    # Keys
    my $keys  = $sth->{NAME_lc};
    
    # Filter
    my $row_hash = {};
    if ($fetch_filter) {
        my $types = $sth->{TYPE};
        for (my $i = 0; $i < @$keys; $i++) {
            if ($self->_no_fetch_filters->{$keys->[$i]}) {
                $row_hash->{$keys->[$i]} = $row->[$i];
            }
            else {
                $row_hash->{$keys->[$i]}
                  = $fetch_filter->($row->[$i], $keys->[$i], $self->_dbi,
                                    {type => $types->[$i], sth => $sth, index => $i});
            }
        }
    }
    
    # No filter
    else {
        for (my $i = 0; $i < @$keys; $i++) {
            $row_hash->{$keys->[$i]} = $row->[$i];
        }
    }
    return wantarray ? %$row_hash : $row_hash;
}

sub fetch_single {
    my $self = shift;
    
    # Fetch
    my $row = $self->fetch;
    
    # Not exist
    return unless $row;
    
    # Finish statement handle
    $self->finish;
    
    return wantarray ? @$row : $row;
}

sub fetch_hash_single {
    my $self = shift;
    
    # Fetch hash
    my $row = $self->fetch_hash;
    
    # Not exist
    return unless $row;
    
    # Finish statement handle
    $self->finish;
    
    return wantarray ? %$row : $row;
}

sub fetch_rows {
    my ($self, $count) = @_;
    
    # Not specified Row count
    croak("Row count must be specified")
      unless $count;
    
    # Fetch multi rows
    my $rows = [];
    for (my $i = 0; $i < $count; $i++) {
        my @row = $self->fetch;
        
        last unless @row;
        
        push @$rows, \@row;
    }
    
    return unless @$rows;
    return wantarray ? @$rows : $rows;
}

sub fetch_hash_rows {
    my ($self, $count) = @_;
    
    # Not specified Row count
    croak("Row count must be specified")
      unless $count;
    
    # Fetch multi rows
    my $rows = [];
    for (my $i = 0; $i < $count; $i++) {
        my %row = $self->fetch_hash;
        
        last unless %row;
        
        push @$rows, \%row;
    }
    
    return unless @$rows;
    return wantarray ? @$rows : $rows;
}

sub fetch_all {
    my $self = shift;
    
    # Fetch all rows
    my $rows = [];
    while(my @row = $self->fetch) {
        push @$rows, [@row];
    }
    return wantarray ? @$rows : $rows;
}

sub fetch_hash_all {
    my $self = shift;
    
    # Fetch all rows as hash
    my $rows = [];
    while(my %row = $self->fetch_hash) {
        push @$rows, {%row};
    }
    return wantarray ? @$rows : $rows;
}

sub finish { shift->sth->finish }

sub error { 
    my $self = shift;
    
    # Statement handle
    my $sth  = $self->sth;
    
    return wantarray ? ($sth->errstr, $sth->err, $sth->state) : $sth->errstr;
}

1;

=head1 NAME

DBIx::Custom::Result - DBIx::Custom Resultset

=head1 SYNOPSIS

    my $result = $dbi->query($query);
    
    # Fetch
    while (my @row = $result->fetch) {
        # Do something
    }
    
    # Fetch hash
    while (my %row = $result->fetch_hash) {
        # Do something
    }

=head1 ATTRIBUTES

=head2 sth

Statement handle

    $result = $result->sth($sth);
    $sth    = $reuslt->sth
    
=head2 fetch_filter

Filter excuted when data is fetched

    $result         = $result->fetch_filter($sth);
    $fetch_filter   = $result->fech_filter;

=head2 no_fetch_filters

Key list which dose not have to fetch filtering

    $result           = $result->no_fetch_filters($no_fetch_filters);
    $no_fetch_filters = $result->no_fetch_filters;

=head1 METHODS

This class is L<Object::Simple> subclass.
You can use all methods of L<Object::Simple>

=head2 new

    my $result = DBIx::Custom::Result->new;

=head2 fetch

Fetch a row

    $row = $result->fetch; # array reference
    @row = $result->fecth; # array

The following is fetch sample

    while (my $row = $result->fetch) {
        # do something
        my $val1 = $row->[0];
        my $val2 = $row->[1];
    }

=head2 fetch_hash

Fetch row as hash

    $row = $result->fetch_hash; # hash reference
    %row = $result->fetch_hash; # hash

The following is fetch_hash sample

    while (my $row = $result->fetch_hash) {
        # do something
        my $val1 = $row->{key1};
        my $val2 = $row->{key2};
    }

=head2 fetch_single

Fetch only first row(Scalar context)

    $row = $result->fetch_single; # array reference
    @row = $result->fetch_single; # array
    
The following is fetch_single sample

    $row = $result->fetch_single;
    
This method fetch only first row and finish statement handle

=head2 fetch_hash_single
    
Fetch only first row as hash

    $row = $result->fetch_hash_single; # hash reference
    %row = $result->fetch_hash_single; # hash
    
The following is fetch_hash_single sample

    $row = $result->fetch_hash_single;
    
This method fetch only single row and finish statement handle

=head2 fetch_rows

Fetch rows

    $rows = $result->fetch_rows($row_count); # array ref of array ref
    @rows = $result->fetch_rows($row_count); # array of array ref
    
The following is fetch_rows sample

    while(my $rows = $result->fetch_rows(10)) {
        # do someting
    }

=head2 fetch_hash_rows

Fetch rows as hash

    $rows = $result->fetch_hash_rows($row_count); # array ref of hash ref
    @rows = $result->fetch_hash_rows($row_count); # array of hash ref
    
The following is fetch_hash_rows sample

    while(my $rows = $result->fetch_hash_rows(10)) {
        # do someting
    }

=head2 fetch_all

Fetch all rows

    $rows = $result->fetch_all; # array ref of array ref
    @rows = $result->fecth_all; # array of array ref

The following is fetch_all sample

    my $rows = $result->fetch_all;

=head2 fetch_hash_all

Fetch all row as array ref of hash ref (Scalar context)

    $rows = $result->fetch_hash_all; # array ref of hash ref
    @rows = $result->fecth_all_hash; # array of hash ref

The following is fetch_hash_all sample

    my $rows = $result->fetch_hash_all;

=head2 error

Get error infomation

    $error_messege = $result->error;
    ($error_message, $error_number, $error_state) = $result->error;
    

You can get get information. This is same as the following.

    $error_message : $result->sth->errstr
    $error_number  : $result->sth->err
    $error_state   : $result->sth->state

=head2 finish

Finish statement handle

    $result->finish

This is equel to

    $result->sth->finish;

=cut