# ABSTRACT: Class to ease manipulation of MIME types

package Dancer2::Core::MIME;
$Dancer2::Core::MIME::VERSION = '0.204001';
use Moo;

use Plack::MIME;
use Dancer2::Core::Types;
use Module::Runtime 'require_module';

# Initialise MIME::Types at compile time, to ensure it's done before
# the fork in a preforking webserver like mod_perl or Starman. Not
# doing this leads to all MIME types being returned as "text/plain",
# as MIME::Types fails to load its mappings from the DATA handle. See
# t/04_static_file/003_mime_types_reinit.t and GH#136.
BEGIN {
    if ( eval { require_module('MIME::Types'); 1; } ) {
        my $mime_types = MIME::Types->new(only_complete => 1);
        Plack::MIME->set_fallback(
            sub {
                $mime_types->mimeTypeOf($_[0])
            }
        );
    }
}

has custom_types => (
    is      => 'ro',
    isa     => HashRef,
    default => sub { +{} },
);

has default => (
    is      => 'rw',
    isa     => Str,
    builder => "reset_default",
);

sub reset_default {
    my ($self) = @_;
    $self->default("application/data");
}

sub add_type {
    my ( $self, $name, $type ) = @_;
    $self->custom_types->{$name} = $type;
    return;
}

sub add_alias {
    my ( $self, $alias, $orig ) = @_;
    my $type = $self->for_name($orig);
    $self->add_type( $alias, $type );
    return $type;
}

sub for_file {
    my ( $self, $filename ) = @_;
    my ($ext) = $filename =~ /\.([^.]+)$/;
    return $self->default unless $ext;
    return $self->for_name($ext);
}

sub name_or_type {
    my ( $self, $name ) = @_;

    return $name if $name =~ m{/};    # probably a mime type
    return $self->for_name($name);
}

sub for_name {
    my ( $self, $name ) = @_;

    return
         $self->custom_types->{ lc $name }
      || Plack::MIME->mime_type( lc ".$name" )
      || $self->default;
}

1;

__END__

=pod

=encoding UTF-8

=head1 NAME

Dancer2::Core::MIME - Class to ease manipulation of MIME types

=head1 VERSION

version 0.204001

=head1 SYNOPSIS

    use Dancer2::Core::MIME;

    my $mime = Dancer2::Core::MIME->new();

    # get mime type for an alias
    my $type = $mime->for_name('css');

    # set a new mime type
    my $type = $mime->add_type( foo => 'text/foo' );

    # set a mime type alias
    my $alias = $mime->add_alias( f => 'foo' );

    # get mime type for a file (based on extension)
    my $file = $mime->for_file( "foo.bar" );

    # set the $thing into a content $type.
    my $type = $mime->name_or_type($thing);

    # get current defined default mime type
    my $type = $mime->default;

    # set the default mime type using config.yml
    # or using the set keyword
    set default_mime_type => 'text/plain';

=head1 DESCRIPTION

Dancer2::Core::MIME is a thin wrapper around L<MIME::Types> providing helpful
methods for MIME handling.

=head1 ATTRIBUTES

=head2 custom_types

Custom user-defined MIME types that are added the with C<add_type>.

=head2 default

Default MIME type defined by MIME::Types, set to: B<application/data>.

=head1 METHODS

=head2 reset_default

This method resets C<mime_type> to the default type.

=head2 add_type

This method adds the new MIME type.

=head2 add_alias

The C<add_alias> sets a MIME type alias.

=head2 for_name

The method C<for_name> gets MIME type for an alias.

=head2 for_file

This method gets MIME type for a file based on extension.

=head2 name_or_type

This method sets the customized MIME name or default MIME type into a content
type.

=head1 AUTHOR

Dancer Core Developers

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2016 by Alexis Sukrieh.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut
