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package Model;

use SQL::Library;
use DBIx::Simple;
use Digest::SHA1;
use Data::Printer;
use DateTime::Format::MySQL;

use Moo;
# required items for constructor:
has $_ => ( is => 'ro', required => 1 ) for qw(dbh app_config); # appdir, environment, etc
has dbix => ( is => 'lazy', builder => sub { DBIx::Simple->new(shift->dbh) } );
has sql_lib => ( is => 'lazy' ); # _build_sql_lib()

#-------------------------------------------------------------------------------
sub authenticate_user {
    my ($self, $params) = @_; # p $params;

    my $sql  = $self->sql_lib->retr('user_details'); # p $sql;
# get user from users table using supplied username param, or return:
    my $user = $self->_query($sql, $params->{username}) || return 0; # p $user;

# don't need authenticated login for dev env:
    unless ( $self->app_config->{environment} eq 'development' ) {
        # check SHA1 b64digest 'password' param matches patient_access.password:
        my $digest = _sha1_digest($params->{password}); # p $digest;
        return 0 unless $user->{password} eq $digest;
    }

# update last_login date:
    my $now = 'NOW()'; # DateTime->now( time_zone => 'Europe/London' );
    $self->dbix->update( 'patient_access',
        { last_login => \$now },
        { patient_id => $user->{patient_id} },
    );

    return $user;
}

#-------------------------------------------------------------------------------
sub get_outreach_data {
    my ($self, $nhs_number) = @_; # p $nhs_number;
    my %h;
    { # pack dispatches:
        my $sql  = $self->sql_lib->retr('pack_dispatches'); # p $sql;
        my @data = $self->_query($sql, $nhs_number); # p @data;
        $h{packs} = \@data;
    }
    { # results:
        my $sql  = $self->sql_lib->retr('results'); # p $sql;
        my @data = $self->_query($sql, $nhs_number); # p @data;
        $h{results} = \@data;
    }
    return \%h;
}

#-------------------------------------------------------------------------------
sub validate_password {
    my ($self, $params, $session) = @_; # p $params; p $session;

    my $digest = _sha1_digest($params->{password}); # p $digest;

    my %h = (); # return \%h;
    unless ( $session->{password} eq $digest ) { # p $session->{password};
        $h{errors} = { password => "sorry, your password doesn't match!" };
    }
    return \%h;
}

# private subs =================================================================
sub _query {
    my $self = shift;
    my ($sql, @bind) = @_; # p $sql; p @bind;

    my $data = $self->dbix->query($sql, @bind)->hashes; # p $data;
    _autoinflate_dates($data);

    # return array, ref to array of hashrefs or single hashref:
    return wantarray
        ? @$data
        : @$data > 1
            ? $data # AoH
            : $data->[0]; # href
}

#-------------------------------------------------------------------------------
# if it looks like a MySQL date or date + time, inflate to DateTime object:
sub _autoinflate_dates {
    my $data = shift;

    my $re = qr!\d{4}-\d{2}-\d{2}(\s\d{2}:\d{2}:\d{2})?!;

    my $to_datetime = sub {
        my $val = shift || return; # p $val;
        if ( my ($date) = $val =~ m!\A($re)\Z! ) { # p $date;
            $val = length $date > 10 # ie date + time
                ? DateTime::Format::MySQL->parse_datetime($date)
                : DateTime::Format::MySQL->parse_date($date);
        }
        return $val;
    };

    for my $ref(@$data) {
       $ref->{$_} = &$to_datetime($ref->{$_}) for keys %$ref;
    }
}

#-------------------------------------------------------------------------------
sub _sha1_digest {
	my $str = shift; # p $str;

    my $sha1 = Digest::SHA1->new;
    $sha1->add($str);

    return $sha1->b64digest;
}

#-------------------------------------------------------------------------------
sub _build_sql_lib {
    my $lib = shift->app_config->{appdir} . '/src/queries.sql';
    SQL::Library->new({ lib => $lib });
};

=begin
sub _build_dbix { # warn 'building dbix object';
    my $dsn = 'dbi:mysql:database=hilis4;mysql_read_default_file=~/.local/mysql.cnf';
    DBIx::Simple->connect($dsn);
}
=cut

1;