package DBI::Custom;

use Object::Simple;

our $VERSION = '0.0101';

use Carp 'croak';

use DBI;

use DBI::Custom::SQL::Template;

use DBI::Custom::Result;

use DBI::Custom::Query;

### Class-Object Accessors

sub user        : ClassObjectAttr { initialize => {clone => 'scalar'} }

sub password    : ClassObjectAttr { initialize => {clone => 'scalar'} }

sub data_source : ClassObjectAttr { initialize => {clone => 'scalar'} }

sub database    : ClassObjectAttr { initialize => {clone => 'scalar'} }

sub dbi_options : ClassObjectAttr { initialize => {clone => 'hash', 

                                                  default => sub { {} } } }

sub bind_filter  : ClassObjectAttr { initialize => {clone => 'scalar'} }

sub fetch_filter : ClassObjectAttr { initialize => {clone => 'scalar'} }

sub no_bind_filters   : ClassObjectAttr { initialize => {clone => 'array'} }

sub no_fetch_filters  : ClassObjectAttr { initialize => {clone => 'array'} }

sub filters : ClassObjectAttr {

    type => 'hash',

    deref => 1,

    initialize => {

        clone   => 'hash',

        default => sub { {} }

    }

}

sub result_class : ClassObjectAttr {

    initialize => {

        clone   => 'scalar',

        default => 'DBI::Custom::Result'

    }

}

sub sql_template : ClassObjectAttr {

    initialize => {

        clone   => sub {$_[0] ? $_[0]->clone : undef},

        default => sub {DBI::Custom::SQL::Template->new}

    }

}

### Object Accessor

sub dbh          : Attr {}

### Methods

# Add filter

sub add_filter {

    my $invocant = shift;

    my %old_filters = $invocant->filters;

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

    $invocant->filters(%old_filters, %new_filters);

    return $invocant;

}

# Auto commit

sub _auto_commit {

    my $self = shift;

    croak("Cannot change AutoCommit becouse of not connected")

        unless $self->dbh;

    if (@_) {

        $self->dbh->{AutoCommit} = $_[0];

        return $self;

    }

    return $self->dbh->{AutoCommit};

}

# Connect

sub connect {

    my $self = shift;

    my $data_source = $self->data_source;

    my $user        = $self->user;

    my $password    = $self->password;

    my $dbi_options  = $self->dbi_options;

    my $dbh = DBI->connect(

        $data_source,

        $user,

        $password,

        {

            RaiseError => 1,

            PrintError => 0,

            AutoCommit => 1,

            %{$dbi_options || {} }

        }

    );

    $self->dbh($dbh);

    return $self;

}

# DESTROY

sub DESTROY {

    my $self = shift;

    $self->disconnect if $self->connected;

}

# Is connected?

sub connected {

    my $self = shift;

    return exists $self->{dbh} && eval {$self->{dbh}->can('prepare')};

}

# Disconnect

sub disconnect {

    my $self = shift;

    if ($self->connected) {

        $self->dbh->disconnect;

        delete $self->{dbh};

    }

}

# Reconnect

sub reconnect {

    my $self = shift;

    $self->disconnect if $self->connected;

    $self->connect;

}

# Run tranzaction

sub run_tranzaction {

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

    $self->_auto_commit(0);

    eval {

        $tranzaction->();

        $self->dbh->commit;

    };

    if ($@) {

        my $tranzaction_error = $@;

        $self->dbh->rollback or croak("$@ and rollback also failed");

        croak("$tranzaction_error");

    }

    $self->_auto_commit(1);

}

sub create_query {

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

    # Create query from SQL template

    my $query = $self->sql_template->create_query($template);

    # Create Query object;

    $query = DBI::Custom::Query->new($query);

    # connect if not

    $self->connect unless $self->connected;

    # Prepare statement handle

    my $sth = $self->dbh->prepare($query->{sql});

    # Set statement handle

    $query->sth($sth);

    # Set bind filter

    $query->bind_filter($self->bind_filter);

    # Set no filter keys when binding

    $query->no_bind_filters($self->no_bind_filters);

    # Set fetch filter

    $query->fetch_filter($self->fetch_filter);

    # Set no filter keys when fetching

    $query->no_fetch_filters($self->no_fetch_filters);

    return $query;

}

sub execute {

    my ($self, $query, $params)  = @_;

    $params ||= {};

    # Create bind value

    my $bind_values = $self->_build_bind_values($query, $params);

    # Execute

    my $sth = $query->sth;

    my $ret_val = $sth->execute(@$bind_values);

    # Return resultset if select statement is executed

    if ($sth->{NUM_OF_FIELDS}) {

        my $result_class = $self->result_class;

        my $result = $result_class->new({

            sth              => $sth,

            fetch_filter     => $query->fetch_filter,

            no_fetch_filters => $query->no_fetch_filters

        });

        return $result;

    }

    return $ret_val;

}

sub _build_bind_values {

    my ($self, $query, $params) = @_;

    my $key_infos           = $query->key_infos;

    my $bind_filter         = $query->bind_filter;

    my $no_bind_filters_map = $query->_no_bind_filters_map || {};

    # binding values

    my @bind_values;

    # Filter and sdd bind values

    foreach my $key_info (@$key_infos) {

        my $filtering_key = $key_info->{key};

        my $access_keys = $key_info->{access_keys};

        my $original_key = $key_info->{original_key} || '';

        my $table        = $key_info->{table}        || '';

        my $column       = $key_info->{column}       || '';

        ACCESS_KEYS :

        foreach my $access_key (@$access_keys) {

            my $root_params = $params;

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

                my $key = $access_key->[$i];

                croak("'access_keys' each value must be string or array reference")

                  unless (ref $key eq 'ARRAY' || ($key && !ref $key));

                if ($i == @$access_key - 1) {

                    if (ref $key eq 'ARRAY') {

                        if ($bind_filter && !$no_bind_filters_map->{$original_key}) {

                            push @bind_values, 

                                 $bind_filter->($root_params->[$key->[0]],

                                                $original_key, $table, $column);

                        }

                        else {

                            push @bind_values, scalar $root_params->[$key->[0]];

                        }

                    }

                    else {

                        next ACCESS_KEYS unless exists $root_params->{$key};

                        if ($bind_filter && !$no_bind_filters_map->{$original_key}) {

                            push @bind_values,

                                 $bind_filter->($root_params->{$key}, 

                                                $original_key, $table, $column);

                        }

                        else {

                            push @bind_values, scalar $root_params->{$key};

                        }

                    }

                    return @bind_values;

                }

                if ($key eq 'ARRAY') {

                    $root_params = $root_params->[$key->[0]];

                }

                else {

                    next ACCESS_KEYS unless exists $root_params->{$key};

                    $root_params = $root_params->{$key};

                }

            }

        }

        croak("Cannot find key");

    }

}

Object::Simple->build_class;

=head1 NAME

DBI::Custom - Customizable simple DBI

=head1 VERSION

Version 0.0101

=cut

=head1 SYNOPSIS

  my $dbi = DBI::Custom->new;

  my $query = $dbi->create_query($template);

  $dbi->execute($query);

=head1 CLASS-OBJECT ACCESSORS

=head2 user

    # Set and get database user name

    $self = $dbi->user($user);

    $user = $dbi->user;

    # Sample

    $dbi->user('taro');

=head2 password

    # Set and get database password

    $self     = $dbi->password($password);

    $password = $dbi->password;

    # Sample

    $dbi->password('lkj&le`@s');

=head2 data_source

    # Set and get database data source

    $self        = $dbi->data_source($data_soruce);

    $data_source = $dbi->data_source;

    # Sample(SQLite)

    $dbi->data_source(dbi:SQLite:dbname=$database);

    # Sample(MySQL);

    $dbi->data_source("dbi:mysql:dbname=$database");

    # Sample(PostgreSQL)

    $dbi->data_source("dbi:Pg:dbname=$database");

=head2 database

    # Set and get database name

    $self     = $dbi->database($database);

    $database = $dbi->database;

=head2 dbi_options

    # Set and get DBI option

    $self       = $dbi->dbi_options({$options => $value, ...});

    $dbi_options = $dbi->dbi_options;

    # Sample

    $dbi->dbi_options({PrintError => 0, RaiseError => 1});

dbi_options is used when you connect database by using connect.

=head2 sql_template

    # Set and get SQL::Template object

    $self         = $dbi->sql_template($sql_template);

    $sql_template = $dbi->sql_template;

    # Sample

    $dbi->sql_template(DBI::Cutom::SQL::Template->new);

=head2 filters

    # Set and get filters

    $self    = $dbi->filters($filters);

    $filters = $dbi->filters;

=head2 bind_filter

    # Set and get binding filter

    $self        = $dbi->bind_filter($bind_filter);

    $bind_filter = $dbi->bind_filter

    # Sample

    $dbi->bind_filter($self->filters->{default_bind_filter});

you can get DBI database handle if you need.

=head2 fetch_filter

    # Set and get Fetch filter

    $self         = $dbi->fetch_filter($fetch_filter);

    $fetch_filter = $dbi->fetch_filter;

    # Sample

    $dbi->fetch_filter($self->filters->{default_fetch_filter});

=head2 no_bind_filters

    # Set and get no filter keys when binding

    $self            = $dbi->no_bind_filters($no_bind_filters);

    $no_bind_filters = $dbi->no_bind_filters;

=head2 no_fetch_filters

    # Set and get no filter keys when fetching

    $self             = $dbi->no_fetch_filters($no_fetch_filters);

    $no_fetch_filters = $dbi->no_fetch_filters;

=head2 result_class

    # Set and get resultset class

    $self         = $dbi->result_class($result_class);

    $result_class = $dbi->result_class;

    # Sample

    $dbi->result_class('DBI::Custom::Result');

=head2 dbh

    # Get database handle

    $dbh = $self->dbh;

=head1 METHODS

=head2 connect

    # Connect to database

    $self = $dbi->connect;

    # Sample

    $dbi = DBI::Custom->new(user => 'taro', password => 'lji8(', 

                            data_soruce => "dbi:mysql:dbname=$database");

    $dbi->connect;

=head2 disconnect

    # Disconnect database

    $dbi->disconnect;

If database is already disconnected, this method do noting.

=head2 reconnect

    # Reconnect

    $dbi->reconnect;

=head2 connected

    # Check connected

    $dbi->connected

=head2 add_filter

    # Add filter (hash ref or hash can be recieve)

    $self = $dbi->add_filter({$filter_name => $filter, ...});

    $self = $dbi->add_filter($filetr_name => $filter, ...);

    # Sample

    $dbi->add_filter(

        decode_utf8 => sub {

            my $value = shift;

            return Encode::decode('UTF-8', $value);

        },

        datetime_to_string => sub {

            my $value = shift;

            return $value->strftime('%Y-%m-%d %H:%M:%S')

        },

        default_bind_filter => sub {

            my ($value, $key, $filters) = @_;

            if (ref $value eq 'Time::Piece') {

                return $filters->{datetime_to_string}->($value);

            }

            else {

                return $filters->{decode_utf8}->($value);

            }

        },

        encode_utf8 => sub {

            my $value = shift;

            return Encode::encode('UTF-8', $value);

        },

        string_to_datetime => sub {

            my $value = shift;

            return DateTime::Format::MySQL->parse_datetime($value);

        },

        default_fetch_filter => sub {

            my ($value, $key, $filters, $type, $sth, $i) = @_;

            if ($type eq 'DATETIME') {

                return $self->filters->{string_to_datetime}->($value);

            }

            else {

                return $self->filters->{encode_utf8}->($value);

            }

        }

    );

add_filter add filter to filters

=head2 create_query

    # Create Query object from SQL template

    my $query = $dbi->create_query($template);

=head2 execute

    # Parse SQL template and execute SQL

    $result = $dbi->query($query, $params);

    $result = $dbi->query($template, $params); # Shorcut

    # Sample

    $result = $dbi->query("select * from authors where {= name} && {= age}", 

                          {author => 'taro', age => 19});

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

        # do something

    }

See also L<DBI::Custom::SQL::Template>

=head2 run_tranzaction

    # Run tranzaction

    $dbi->run_tranzaction(sub {

        # do something

    });

If tranzaction is success, commit is execute. 

If tranzation is died, rollback is execute.

=head1 AUTHOR

Yuki Kimoto, C<< <kimoto.yuki at gmail.com> >>

=head1 COPYRIGHT & LICENSE

Copyright 2009 Yuki Kimoto, all rights reserved.

This program is free software; you can redistribute it and/or modify it

under the same terms as Perl itself.

=cut

1; # End of DBI::Custom