package DBIx::Custom::Model;

use Object::Simple -base;

use Carp 'croak';

use DBIx::Custom::Util '_subname';

# Carp trust relationship

push @DBIx::Custom::CARP_NOT, __PACKAGE__;

has [qw/dbi table created_at updated_at bind_type join primary_key/],

    columns => sub { [] };

our $AUTOLOAD;

sub AUTOLOAD {

    my $self = shift;

    # Method name

    my ($package, $mname) = $AUTOLOAD =~ /^([\w\:]+)\:\:(\w+)$/;

    # Method

    $self->{_methods} ||= {};

    if (my $method = $self->{_methods}->{$mname}) {

        return $self->$method(@_)

    }

    elsif (my $dbi_method = $self->dbi->can($mname)) {

        $self->dbi->$dbi_method(@_);

    }

    elsif ($self->{dbh} && (my $dbh_method = $self->dbh->can($mname))) {

        $self->dbi->dbh->$dbh_method(@_);

    }

    else {

        croak qq{Can't locate object method "$mname" via "$package" }

            . _subname;

    }

}

my @methods = qw/insert insert_at update update_at update_all

  delete delete_at delete_all select select_at count/;

for my $method (@methods) {

    my $code =

         qq/sub {/ .

         qq/my \$self = shift;/ .

         qq/\$self->dbi->$method(/ .

             qq/\@_ % 2 ? shift : (),/;

    my @attrs = qw/table type primary_key bind_type/;

    my @insert_attrs = qw/created_at updated_at/;

    my @update_attrs = qw/updated_at/;

    my @select_attrs = qw/join/;

    if ($method eq 'insert') { push @attrs, @insert_attrs }

    elsif ($method eq 'update') { push @attrs, @update_attrs }

    elsif (index($method, 'select') != -1) { push @attrs, @select_attrs }

    for my $attr (@attrs) {

        $code .= "exists \$self->{$attr} ? ($attr => \$self->{$attr}) : (),";

    }

    $code .= qq/\@_);/ .

         qq/}/;

    no strict 'refs';

    *{__PACKAGE__ . "::$method"} = eval $code;

    croak $code if $@;

}

sub update_or_insert {

    my ($self, $param, %opt) = @_;

    croak "update_or_insert method need primary_key and id option "

      unless (defined $opt{id} || defined $self->{id})

          && (defined $opt{primary_key} || defined $self->{primary_key});

    my $statement_opt = $opt{option} || {};

    my $rows = $self->select(%opt, %{$statement_opt->{select} || {}})->all;

    if (@$rows == 0) {

        return $self->insert($param, %opt, %{$statement_opt->{insert} || {}});

    }

    elsif (@$rows == 1) {

        return $self->update($param, %opt, %{$statement_opt->{update} || {}});

    }

    else {

        croak "selected row must be one " . _subname;

    }

}

sub execute {

    my $self = shift;

    if ($ENV{DBIX_CUSTOM_DISABLE_MODEL_EXECUTE}) {

        $self->dbi->execute(@_);

    }

    else {

        warn "DBIx::Custom::Model execute method is DEPRECATED! " .

             "use DBIx::Custom execute method. " .

             "If you want to call DBIx::Custom execute method directory from model, " .

             "set \$ENV{DBIX_CUSTOM_DISABLE_MODEL_EXECUTE} to 1 " .

             "until DBIx::Custom::Model execute method is removed in the future." ;

        return $self->dbi->execute(

            shift,

            shift,

            table => $self->table,

            bind_type => $self->bind_type,

            primary_key => $self->primary_key,

            type => $self->type,

            @_

        );    

    }

}

sub DESTROY { }

sub helper {

    my $self = shift;

    # Merge

    my $methods = ref $_[0] eq 'HASH' ? $_[0] : {@_};

    $self->{_methods} = {%{$self->{_methods} || {}}, %$methods};

    return $self;

}

sub mycolumn {

    my $self = shift;

    my $table = shift unless ref $_[0];

    my $columns = shift;

    $table ||= $self->table || '';

    $columns ||= $self->columns;

    return $self->dbi->mycolumn($table, $columns);

}

sub new {

    my $self = shift->SUPER::new(@_);

    # Check attribute names

    my @attrs = keys %$self;

    for my $attr (@attrs) {

        croak qq{"$attr" is invalid attribute name } . _subname

          unless $self->can($attr);

    }

    # Cache

    for my $attr (qw/dbi table created_at updated_at bind_type join primary_key/) {

        $self->$attr;

        $self->{$attr} = undef unless exists $self->{$attr};

    }

    $self->columns;

    return $self;

}

# DEPRECATED!

has 'filter';

has 'name';

has 'type';

# DEPRECATED!

sub method {

    warn "method method is DEPRECATED! use helper instead";

    return shift->helper(@_);

}

1;

=head1 NAME

DBIx::Custom::Model - Model

=head1 SYNOPSIS

use DBIx::Custom::Model;

my $model = DBIx::Custom::Model->new(table => 'books');

=head1 ATTRIBUTES

=head2 C<dbi>

    my $dbi = $model->dbi;

    $model = $model->dbi($dbi);

L<DBIx::Custom> object.

=head2 C<created_at EXPERIMENTAL>

    my $created_at = $model->created_at;

    $model = $model->created_at('created_datatime');

Create timestamp column, this is passed to C<insert> or C<update> method.

=head2 C<join>

    my $join = $model->join;

    $model = $model->join(

        ['left outer join company on book.company_id = company.id']

    );

Join clause, this value is passed to C<select> method.

=head2 C<primary_key>

    my $primary_key = $model->primary_key;

    $model = $model->primary_key(['id', 'number']);

Primary key,this is passed to C<insert>, C<update>,

C<delete>, and C<select> method.

=head2 C<table>

    my $model = $model->table;

    $model = $model->table('book');

Table name, this is passed to C<select> method.

=head2 C<bind_type>

    my $type = $model->bind_type;

    $model = $model->bind_type(['image' => DBI::SQL_BLOB]);

Database data type, this is used as type optioon of C<insert>, 

C<update>, C<update_all>, C<delete>, C<delete_all>,

and C<select> method

=head2 C<updated_at EXPERIMENTAL>

    my $updated_at = $model->updated_at;

    $model = $model->updated_at('updated_datatime');

Updated timestamp column, this is passed to C<update> method.

=head1 METHODS

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

and you can use all methods of L<DBIx::Custom> and L<DBI>

and implements the following new ones.

=head2 C<count>

    my $count = $model->count;

Get rows count.

Options is same as C<select> method's ones.

=head2 C<delete>

    $model->delete(...);

Same as C<delete> of L<DBIx::Custom> except that

you don't have to specify options if you set attribute in model.

=head2 C<delete_all>

    $model->delete_all(...);

Same as C<delete_all> of L<DBIx::Custom> except that

you don't have to specify options if you set attribute in model.

=head2 C<insert>

    $model->insert(...);

Same as C<insert> of L<DBIx::Custom> except that

you don't have to specify options if you set attribute in model.

=head2 C<helper>

    $model->helper(

        update_or_insert => sub {

            my $self = shift;

            # ...

        },

        find_or_create   => sub {

            my $self = shift;

            # ...

    );

Register helper. These helper is called directly from L<DBIx::Custom::Model> object.

    $model->update_or_insert;

    $model->find_or_create;

=head2 C<mycolumn>

    my $column = $self->mycolumn;

    my $column = $self->mycolumn(book => ['author', 'title']);

    my $column = $self->mycolumn(['author', 'title']);

Create column clause for myself. The follwoing column clause is created.

    book.author as author,

    book.title as title

If table name is ommited, C<table> attribute of the model is used.

If column names is omitted, C<columns> attribute of the model is used.

=head2 C<new>

    my $model = DBIx::Custom::Model->new;

Create a L<DBIx::Custom::Model> object.

=head2 C<select>

    $model->select(...);

Same as C<select> of L<DBIx::Custom> except that

you don't have to specify options if you set attribute in model.

=head2 C<update>

    $model->update(...);

Same as C<update> of L<DBIx::Custom> except that

you don't have to specify options if you set attribute in model.

=head2 C<update_all>

    $model->update_all(param => \%param);

Same as C<update_all> of L<DBIx::Custom> except that

you don't have to specify options if you set attribute in model.

=head2 C<update_or_insert>

    $model->update_or_insert(...);

Same as C<update> of L<DBIx::Custom> except that

you don't have to specify options if you set attribute in model.

=cut