=head1 NAME

Dam::Var

=head1 DESCRIPTION

API for global variables.

=head1 FUNCTIONS

=cut

use strict;
use warnings;
use utf8;

package Dam::Var;

use Exporter qw(import);
our @EXPORT = qw(
	UNDEF_VAR
	DELETE_VAR

	CONFIG
	GLOBAL
	RESERVED
);

use constant {
	UNDEF_VAR  => 'K9a(fz=D>vFy3m485jE]:Jm2B@3Ou6',
	DELETE_VAR => '5s<N0U{R_hNgQn@CyKoD(]rUWO)mbW'
};

use Cwd;

use Dam::Util;



# CONFIGURATION VARIABLES:

# Today:
my ($y, $m, $d) = get_today_ymd();

# Version news:
my @LAST_CHANGELOG = ();
my @PREV_CHANGELOG = ();

# No access groups:
my @ACCESS_GROUPS = ();

# Menus:
my %ROUTES = ();
my %USER_MENU = (
	ID => 'Admin',
	TEXT => 'User',
	OPTIONS => {
		M_01 => { RUN => 'RUN_close', ICON => 'off', ACCESS => [ 1 ], TEXT => 'Close session' }
	}
);


my %CONFIG_VARS = (

	# DEBUG MODE (0 = PRODUCTION, 1 = DEVELOPMENT, 2 = TESTING):

	DEBUG_MODE => 1,

	# APPLICATION NAME AND SLOGAN:

	APP_NAME   => 'My Application',
	APP_MNEMO  => 'App',
	APP_SLOGAN => '',

	# APP FOLDERS & RESOURCE URL:

	DIR_APP       => getcwd(),
	DIR_TEMPLATES => strval(getcwd(), '/templates'),
	DIR_UPLOADS   => strval(getcwd(), '/uploads'),
	ROOT_WWW      => '/',

	# DATABASE ACCESS CONFIGURATION:

	DB_DSN      => 'DBI:mysql:database=dbname;host=hostname',
	DB_USER     => 'user',
	DB_PASSWORD => 'password',

	# ACTIVE DIRECTORY CONFIGURATION:

	AD_DOMAIN => '',
	AD_SERVER => '',

	# MESSAGES TRANSLATION:

	l10n => 'EN_en',

	# MAX SIZE FOR UPLOADED FILES (5MB):

	UPLOAD_MAX_FILESIZE => 5 * 1024 * 1024,

	# FOOTER COPYRIGHT:

	FOOTER_COPYRIGHT => strval('&copy; ', $y, ' Made with Dam Framework'),

	# VERSION VARIABLES:

	VERSION => '0.01',
	REF_LAST_CHANGELOG => \@LAST_CHANGELOG,
	REF_PREV_CHANGELOG => \@PREV_CHANGELOG,

	# ACCESS GROUPS FOR USERS REFERENCE:

	REF_ACCESS_GROUPS => \@ACCESS_GROUPS,

	# MENU REFERENCES:

	REF_ROUTES => \%ROUTES,
	REF_USER_MENU => \%USER_MENU
);



# GLOBAL VARIABLES:

my %GLOBAL_VARS = ();



# RESERVED VARIABLES:

# Error, warning, information and debug messages:
my @REPORT_ERROR   = ();
my @REPORT_WARNING = ();
my @REPORT_INFO    = ();
my @DEBUG_INFO     = ();


my %RESERVED_VARS = (

	# CGI APP:

	CGIAPP => undef,

	# ERROR, WARNING, INFORMATION AND DEBUG MESSAGES:

	REF_REPORT_ERROR   => \@REPORT_ERROR,
	REF_REPORT_WARNING => \@REPORT_WARNING,
	REF_REPORT_INFO    => \@REPORT_INFO,
	REF_DEBUG_INFO     => \@DEBUG_INFO,

	# CURRENT REPORT:

	REF_CURRENT_PACKAGE => undef
);



=head2 CONFIG($variable, $value)

Mantiene una estructura global de variables ($variable => $value).

=cut

sub CONFIG {
	push(@_, undef) if @_ % 2;
	my %variables = @_;

	my @variables = keys(%variables);
	if (!@variables) {
		foreach my $var (keys(%CONFIG_VARS)) {
			info($var, ' => ', strval($CONFIG_VARS{$var}));
		}
		fatal('Global configuration variable name is required');
	}

	my $variable;
	foreach my $var (@variables) {
		fatal('Global configuration variable "', $var, '" doesn\'t exist') if !exists($CONFIG_VARS{$var});
		if (defined($variables{$var})) {
			fatal('Global configuration variables cannot be deleted (see "', $var, '")') if is_eq($variables{$var}, DELETE_VAR);
			$CONFIG_VARS{$var} = $variables{$var};
		}
		$variable = $var;
	}
	return $CONFIG_VARS{$variable};
}



=head2 GLOBAL($variable, $value)

Mantiene una estructura global de variables ($variable => $value).

=cut

sub GLOBAL {
	push(@_, undef) if @_ % 2;
	my %variables = @_;

	my @variables = keys(%variables);
	if (!@variables) {
		foreach my $var (keys(%GLOBAL_VARS)) {
			info($var, ' => ', strval($GLOBAL_VARS{$var}));
		}
		fatal('Global variable name is required');
	}

	my $variable;
	foreach my $var (@variables) {
		__assign(\%GLOBAL_VARS, \%variables, $var);
		$variable = $var;
	}
	return exists($GLOBAL_VARS{$variable}) ? $GLOBAL_VARS{$variable} : undef;
}



=head2 RESERVED($variable, $value)

Mantiene una estructura global de variables ($variable => $value).

=cut

sub RESERVED {
	my $caller = caller();
	$caller = substr($caller, 0, index($caller, '::'));
	fatal('Reserved variables can only be used by Dam framework') if !is_eq($caller, 'Dam');

	push(@_, undef) if @_ % 2;
	my %variables = @_;

	my @variables = keys(%variables);
	if (!@variables) {
		foreach my $var (keys(%RESERVED_VARS)) {
			info($var, ' => ', strval($RESERVED_VARS{$var}));
		}
		fatal('Reserved variable name is required');
	}

	my $variable;
	foreach my $var (@variables) {
		__assign(\%RESERVED_VARS, \%variables, $var);
		$variable = $var;
	}
	return exists($RESERVED_VARS{$variable}) ? $RESERVED_VARS{$variable} : undef;
}


# PRIVATE FUNCTIONS:


sub __assign {
	my ($VARS_ref, $variables_ref, $var) = @_;

	if (defined($$variables_ref{$var})) {
		if (is_eq($$variables_ref{$var}, UNDEF_VAR)) {
			$$VARS_ref{$var} = undef;
		}
		elsif (is_eq($$variables_ref{$var}, DELETE_VAR)) {
			delete($$VARS_ref{$var});
		}
		else {
			$$VARS_ref{$var} = $$variables_ref{$var};
		}
	}
}



1;

=head1 AUTHOR

Manuel Cillero C<< <manuel@cillero.es> >>

=head1 COPYRIGHT

The MIT License (MIT)

Copyright (c) 2004-2020 Manuel Cillero. All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

=cut