package DBIx::Custom::Result;

use Object::Simple -base;

use Carp 'croak';

use DBIx::Custom::Util qw/_array_to_hash _subname/;

has [qw/filters filter_off sth type_rule_off/];

has stash => sub { {} };

*all = \&fetch_hash_all;

sub filter {

    my $self = shift;

    # Set

    if (@_) {

        # Convert filter name to subroutine

        my $filter = @_ == 1 ? $_[0] : [@_];

        $filter = _array_to_hash($filter);

        foreach my $column (keys %$filter) {

            my $fname = $filter->{$column};

            if  (exists $filter->{$column}

              && defined $fname

              && ref $fname ne 'CODE') 

            {

              croak qq{Filter "$fname" is not registered" } . _subname

                unless exists $self->filters->{$fname};

              $filter->{$column} = $self->filters->{$fname};

            }

        }

        # Merge

        $self->{filter} = {%{$self->filter}, %$filter};

        return $self;

    }

    return $self->{filter} ||= {};

}

sub fetch {

    my $self = shift;

    # Fetch

    my @row = $self->{sth}->fetchrow_array;

    return unless @row;

    # Filtering

    my $columns = $self->{sth}->{NAME};

    my $types = $self->{sth}->{TYPE};

    my $type_rule = $self->type_rule || {};

    my $filter = $self->filter;

    my $end_filter = $self->end_filter;

    for (my $i = 0; $i < @$columns; $i++) {

        # Column

        my $column = $columns->[$i];

        # Type rule

        my $type_filter = $type_rule->{lc($types->[$i])};

        $row[$i] = $type_filter->($row[$i])

          if $type_filter && !$self->{type_rule_off};

        # Filter

        my $filter  = $filter->{$column} || $self->{default_filter};

        $row[$i] = $filter->($row[$i])

          if $filter && !$self->{filter_off};

        $row[$i] = $end_filter->{$column}->($row[$i])

          if $end_filter->{$column} && !$self->{filter_off};

    }

    return \@row;

}

sub fetch_all {

    my $self = shift;

    # Fetch all rows

    my $rows = [];

    while(my $row = $self->fetch) { push @$rows, $row}

    return $rows;

}

sub fetch_first {

    my $self = shift;

    # Fetch

    my $row = $self->fetch;

    return unless $row;

    # Finish statement handle

    $self->sth->finish;

    return $row;

}

sub fetch_hash {

    my $self = shift;

    # Fetch

    my $row = $self->{sth}->fetchrow_arrayref;

    return unless $row;

    # Filter

    my $hash_row = {};

    my $filter  = $self->filter;

    my $end_filter = $self->end_filter || {};

    my $columns = $self->{sth}->{NAME};

    my $types = $self->{sth}->{TYPE};

    my $type_rule = $self->type_rule || {};

    for (my $i = 0; $i < @$columns; $i++) {

        # Column

        my $column = $columns->[$i];

        # Type rule

        my $type_filter = $type_rule->{lc($types->[$i])};

        if (!$self->{type_rule_off} && $type_filter) {

            $hash_row->{$column} = $type_filter->($row->[$i]);

        }

        else { $hash_row->{$column} = $row->[$i] }

        # Filter

        my $f = $filter->{$column} || $self->{default_filter};

        $hash_row->{$column} = $f->($hash_row->{$column})

          if $f && !$self->{filter_off};

        $hash_row->{$column} = $end_filter->{$column}->($hash_row->{$column})

          if $end_filter->{$column} && !$self->{filter_off};

    }

    return $hash_row;

}

sub fetch_hash_all {

    my $self = shift;

    # Fetch all rows as hash

    my $rows = [];

    while(my $row = $self->fetch_hash) { push @$rows, $row }

    return $rows;

}

sub fetch_hash_first {

    my $self = shift;

    # Fetch hash

    my $row = $self->fetch_hash;

    return unless $row;

    # Finish statement handle

    $self->sth->finish;

    return $row;

}

sub fetch_hash_multi {

    my ($self, $count) = @_;

    # Fetch multiple rows

    croak 'Row count must be specified ' . _subname

      unless $count;

    my $rows = [];

    for (my $i = 0; $i < $count; $i++) {

        my $row = $self->fetch_hash;

        last unless $row;

        push @$rows, $row;

    }

    return unless @$rows;

    return $rows;

}

sub fetch_multi {

    my ($self, $count) = @_;

    # Row count not specifed

    croak 'Row count must be specified ' . _subname

      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 $rows;

}

*one = \&fetch_hash_first;

sub type_rule {

    my $self = shift;

    # Merge type rule

    if (@_) {

        my $type_rule = @_ == 1 ? $_[0] : [@_];

        $type_rule = _array_to_hash($type_rule) || {};

        foreach my $data_type (keys %{$type_rule || {}}) {

            croak qq{data type of into section must be lower case or number}

              if $data_type =~ /[A-Z]/;

            my $fname = $type_rule->{$data_type};

            if (defined $fname && ref $fname ne 'CODE') {

                croak qq{Filter "$fname" is not registered" } . _subname

                  unless exists $self->filters->{$fname};

                $type_rule->{$data_type} = $self->filters->{$fname};

            }

        }

        # Replace

        if (@_ == 1) { $self->{type_rule} = $type_rule }

        # Merge

        else { $self->{type_rule} = {%{$self->type_rule}, %$type_rule} }

    }

    return $self->{type_rule} ||= {};

}

# DEPRECATED!

sub end_filter {

    my $self = shift;

    if (@_) {

        my $end_filter = {};

        if (ref $_[0] eq 'HASH') { $end_filter = $_[0] }

        else { 

            $end_filter = _array_to_hash(

                @_ > 1 ? [@_] : $_[0]

            );

        }

        foreach my $column (keys %$end_filter) {

            my $fname = $end_filter->{$column};

            if  (exists $end_filter->{$column}

              && defined $fname

              && ref $fname ne 'CODE') 

            {

              croak qq{Filter "$fname" is not registered" } . _subname

                unless exists $self->filters->{$fname};

              $end_filter->{$column} = $self->filters->{$fname};

            }

        }

        $self->{end_filter} = {%{$self->end_filter}, %$end_filter};

        return $self;

    }

    return $self->{end_filter} ||= {};

}

# DEPRECATED!

sub remove_end_filter {

    my $self = shift;

    warn "remove_end_filter is DEPRECATED! use filter_off attribute instead";

    $self->{end_filter} = {};

    return $self;

}

# DEPRECATED!

sub remove_filter {

    my $self = shift;

    warn "remove_filter is DEPRECATED! use filter_off attribute instead";

    $self->{filter} = {};

    return $self;

}

# DEPRECATED!

sub default_filter {

    my $self = shift;

    warn "default_filter is DEPRECATED!";

    if (@_) {

        my $fname = $_[0];

        if (@_ && !$fname) {

            $self->{default_filter} = undef;

        }

        else {

            croak qq{Filter "$fname" is not registered}

              unless exists $self->filters->{$fname};

            $self->{default_filter} = $self->filters->{$fname};

        }

        return $self;

    }

    return $self->{default_filter};

}

# DEPRECATED!

has 'filter_check'; 

1;

=head1 NAME

DBIx::Custom::Result - Result of select statement

=head1 SYNOPSIS

    # Result

    my $result = $dbi->select(table => 'book');

    # Fetch a row and put it into array reference

    while (my $row = $result->fetch) {

        my $author = $row->[0];

        my $title  = $row->[1];

    }

    # Fetch only a first row and put it into array reference

    my $row = $result->fetch_first;

    # Fetch all rows and put them into array of array reference

    my $rows = $result->fetch_all;

    # Fetch a row and put it into hash reference

    while (my $row = $result->fetch_hash) {

        my $title  = $row->{title};

        my $author = $row->{author};

    }

    # Fetch only a first row and put it into hash reference

    my $row = $result->fetch_hash_first;

    my $row = $result->one; # Same as fetch_hash_first

    # Fetch all rows and put them into array of hash reference

    my $rows = $result->fetch_hash_all;

    my $rows = $result->all; # Same as fetch_hash_all

=head1 ATTRIBUTES

=head2 C<filter_off> EXPERIMENTAL

    my $filter_off = $resutl->filter_off;

    $result = $result->filter_off(1);

Filtering by C<filter> method is turned off.

=head2 C<filters>

    my $filters = $result->filters;

    $result = $result->filters(\%filters);

Filters.

=head2 C<sth>

    my $sth = $reuslt->sth

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

Statement handle of L<DBI>.

=head2 C<type_rule_off> EXPERIMENTAL

    my $type_rule_off = $result->type_rule_off;

    $result = $result->type_rule_off(1);

Filtering by C<type_rule> is turned off.

=head1 METHODS

L<DBIx::Custom::Result> inherits all methods from L<Object::Simple>

and implements the following new ones.

=head2 C<all>

    my $rows = $result->all;

Same as C<fetch_hash_all>.

=head2 C<fetch>

    my $row = $result->fetch;

Fetch a row and put it into array reference.

=head2 C<fetch_all>

    my $rows = $result->fetch_all;

Fetch all rows and put them into array of array reference.

=head2 C<fetch_first>

    my $row = $result->fetch_first;

Fetch only a first row and put it into array reference,

and finish statment handle.

=head2 C<fetch_hash>

    my $row = $result->fetch_hash;

Fetch a row and put it into hash reference.

=head2 C<fetch_hash_all>

    my $rows = $result->fetch_hash_all;

Fetch all rows and put them into array of hash reference.

=head2 C<fetch_hash_first>

    my $row = $result->fetch_hash_first;

Fetch only a first row and put it into hash reference,

and finish statment handle.

=head2 C<fetch_hash_multi>

    my $rows = $result->fetch_hash_multi(5);

Fetch multiple rows and put them into array of hash reference.

=head2 C<fetch_multi>

    my $rows = $result->fetch_multi(5);

Fetch multiple rows and put them into array of array reference.

=head2 C<filter>

    $result->filter(title  => sub { uc $_[0] }, author => 'to_upper');

    $result->filter([qw/title author/] => 'to_upper');

Set filter for column.

You can use subroutine or filter name as filter.

This filter is executed after C<type_rule> filter.

=head2 C<one>

    my $row = $result->one;

Same as C<fetch_hash_first>.

=head2 C<stash>

    my $stash = $result->stash;

    my $foo = $result->stash->{foo};

    $result->stash->{foo} = $foo;

Stash is hash reference for data.

=head2 C<type_rule> EXPERIMENTAL

    # Merge type rule

    $result->type_rule(

        # DATE

        9 => sub { ... },

        # DATETIME or TIMESTAMP

        11 => sub { ... }

    );

    # Replace type rule(by reference)

    $result->type_rule([

        # DATE

        9 => sub { ... },

        # DATETIME or TIMESTAMP

        11 => sub { ... }

    ]);

This is same as L<DBIx::Custom>'s C<type_rule>'s <from>.

=cut