use strict;
use warnings;
package Mojolicious::Plugin::KossyValidator;
use Smart::Comments;

our $VERSION = '0.02';

use Mojo::Base 'Mojolicious::Plugin';
use Hash::MultiValue;

my $NUM_RE = qr/^[-+]?[0-9]+(:?\.[0-9]+)?$/;

our %VALIDATOR = (
    NOT_NULL => sub {
        my ($req,$val) = @_;
        return if not defined($val);
        return if $val eq "";
        return 1;
    },
    CHOICE => sub {
        my ($req, $val, @args) = @_;
        for my $c (@args) {
            if ($c eq $val) {
                return 1;
            }
        }
        return;
    },
    INT => sub {
        my ($req, $val) = @_;
        return if not defined($val);
        return $val =~ /^\-?[\d]+$/;
    },
    UINT => sub {
        my ($req, $val) = @_;
        return if not defined($val);
        $val =~ /^\d+$/;  
    },
    NATURAL => sub {
        my ($req,$val) = @_;
        return if not defined($val);
        $val =~ /^\d+$/ && $val > 0;
    },
    ALPHA=> sub {
        my ($req,$val) = @_;
        return if not defined($val);
        $val =~ /^[A-Za-z]+$/ && $val > 0;
    },
    BETWEEN => sub {
        my ($req, $value, @args) = @_;
        my ($start, $end) = @args;
        return  unless defined($start) && $start =~ /$NUM_RE/ && defined($end) && $end =~ /$NUM_RE/;
        return  unless defined $value && $value =~ /$NUM_RE/;
        return $value >= $start && $value <= $end ? 1 : 0;
    },
    LENGTH => sub {
        my ($req, $value, $args) = @_;

        return unless defined $value;

        my $min;
        my $max;
        if(ref $args eq 'ARRAY') { ($min, $max) = @$args }
        elsif (ref $args eq 'HASH') {
            $min = $args->{min};
            $max = $args->{max};
        }
        else { $min = $max = $args }

        return 0 unless defined $min || defined $max;

        my $length  = length $value;
        my $is_valid;
        if (defined $min && defined $max) {
            $is_valid = $length >= $min && $length <= $max;
        }
        elsif (defined $min) {
            $is_valid = $length >= $min;
        }
        elsif (defined $max) {
            $is_valid = $length <= $max;
        }
        return $is_valid;
    },
    '@SELECTED_NUM' => sub {
        my ($req,$vals,@args) = @_;
        my ($min,$max) = @args;
        scalar(@$vals) >= $min && scalar(@$vals) <= $max
    },
    '@SELECTED_UNIQ' => sub {
        my ($req,$vals) = @_;
        my %vals;
        $vals{$_} = 1 for @$vals;
        scalar(@$vals) == scalar keys %vals;
    },
);



sub register {
    my ($self, $app, $conf) = @_;
    $app->helper( 
        validator => sub {
            my ($self, $rule) = @_;

            my @errors;
            my $valid = Hash::MultiValue->new;
            my $req = $self->req;

            for ( my $i=0; $i < @$rule; $i = $i+2 ) {
                my $param = $rule->[$i];
                my $constraints;
                my $param_name = $param;
                $param_name =~ s!^@!!;
                my @vals = $self->param($param_name);
                my $vals = ( $param =~ m!^@! ) ? \@vals : [$vals[-1]];

                if ( ref($rule->[$i+1]) && ref($rule->[$i+1]) eq 'HASH' ) {
                    if ( $param !~ m!^@! && !$VALIDATOR{NOT_NULL}->($req, $vals->[0])  && exists $rule->[$i+1]->{default} ) {
                        my $default = $rule->[$i+1]->{default};
                        $vals = [$default];
                    }
                    $constraints = $rule->[$i+1]->{rule};
                }
                else {
                    $constraints = $rule->[$i+1];
                }

                my $error;
                PARAM_CONSTRAINT: for my $constraint ( @$constraints ) {
                    if ( ref($constraint->[0]) eq 'ARRAY' ) {
                        my @constraint = @{$constraint->[0]};
                        my $constraint_name = shift @constraint;
                        if ( ref($constraint_name) && ref($constraint_name) eq 'CODE' ) {
                            for my $val ( @$vals ) {
                                if ( !$constraint_name->($req, $val, @constraint) ) {
                                    push @errors, { param => $param_name, message => $constraint->[1] };
                                    $error=1;
                                    last PARAM_CONSTRAINT;
                                }
                            }
                            next PARAM_CONSTRAINT;
                        }
                        die "constraint:$constraint_name not found" if ! exists $VALIDATOR{$constraint_name};
                        if ( $constraint_name =~ m!^@! ) {
                            if ( !$VALIDATOR{$constraint_name}->($req,$vals,@constraint) ) {
                                push @errors, { param => $param_name, message => $constraint->[1] };
                                $error=1;
                                last PARAM_CONSTRAINT;
                            }                    
                        }
                        else {
                            for my $val ( @$vals ) {
                                if ( !$VALIDATOR{$constraint_name}->($req,$val,@constraint) ) {
                                    push @errors, { param => $param_name, message => $constraint->[1] };
                                    $error=1;
                                    last PARAM_CONSTRAINT;
                                }
                            }
                        }
                    }
                    elsif ( ref($constraint->[0]) eq 'CODE' ) {
                        for my $val ( @$vals ) {
                            if ( !$constraint->[0]->($req, $val) ) {
                                push @errors, { param => $param_name, message => $constraint->[1] };
                                $error=1;
                                last PARAM_CONSTRAINT;
                            }
                        }
                    }
                    else {
                        die "constraint:".$constraint->[0]." not found" if ! exists $VALIDATOR{$constraint->[0]};
                        if ( $constraint->[0] =~ m!^@! ) {
                            if ( !$VALIDATOR{$constraint->[0]}->($req,$vals) ) {
                                push @errors, { param => $param_name, message => $constraint->[1] };
                                $error=1;
                                last PARAM_CONSTRAINT;
                            }                    
                        }
                        else {
                            for my $val ( @$vals ) {
                                if ( !$VALIDATOR{$constraint->[0]}->($req, $val) ) {
                                    push @errors, { param => $param_name, message => $constraint->[1] };
                                    $error=1;
                                    last PARAM_CONSTRAINT;
                                }
                            }
                        }
                    }
                }
                $valid->add($param_name,@$vals) unless $error;
            }
            
            KossyValidator::Result->new(\@errors,$valid);
        } 
    );
}

1;

package KossyValidator::Result;

use strict;
use warnings;

sub new {
    my $class = shift;
    my $errors = shift;
    my $valid = shift;
    bless {errors=>$errors,valid=>$valid}, $class;
}

sub has_error {
    my $self = shift;
    return 1 if @{$self->{errors}};
    return;
}

sub messages {
    my $self = shift;
    my @errors = map { $_->{message} } @{$self->{errors}};
    \@errors;
}

sub errors {
    my $self = shift;
    my %errors = map { $_->{param} => $_->{message} } @{$self->{errors}};
    \%errors;
}

sub valid {
    my $self = shift;
    if ( @_ == 2 ) {
        $self->{valid}->add(@_);
        return $_[1];
    }
    elsif ( @_ == 1 ) {
        return $self->{valid}->get($_[0]) if ! wantarray;
        return $self->{valid}->get_all($_[0]);
    }
    $self->{valid};
}

sub to_hash {
    my $self = shift;
    return %{ $self->valid() };
}

1;

=head1 NAME

Mojolicious::Plugin::KossyValidator - 根据 Kossy 中的 Validator 移植过来的模块

=head1 SYNOPSIS

    use Mojolicious::Plugin::KossyValidator;

    sub show {
        my $c = shift
        my $result = $c->validator([
            'name' => {
                rule => [
                    ['NOT_NULL', '不能为空'],
                    #['ALPHA', '需要是数字'],
                    #[['LENGTH',(10, 20)], '长度为 10-20 之间'],
                    #[['BETWEEN',(1, 2)], '参数只能为数字'],
                ],  
            },  
            'description' => {
                default => '无',
                rule    => [], 
            },  
        ]); 
    
        $c->render( json => {
            result => 'false',
            messages => $result->errors
        }) if $result->has_error;

        $result->has_error:Flag
        $result->messages:ArrayRef[`Str]
         
        my $val = $result->valid('name');  # 注意取请求过来的参数时原函数 param 替换为 valid 了
        my @val = $result->valid('description');
         
        my %hash = $result->to_hash;
        # ...
    };

    dancer;

=head1 DESCRIPTION

Kossy 是 Perl 中另一个迷你框架，这个模块根据 Kossy 中的 Validator 移植过来支持 Mojolicious 的模块。

=head1 VALIDATORS

=over 4

=item NOT_NULL

=item CHOICE

  ['CHOICE',qw/dog cat/]

=item INT

int

=item UINT

unsigned int

=item NATURAL

natural number

=item ALPHA

English alphabet

=item BETWEEN

between two number

=item LENGTH

param length

=item @SELECTED_NUM

  ['@SELECTED_NUM',min,max]

=item @SELECTED_UNIQ

all selected values are unique

=back

=head1 CODEref VALIDATOR

  my $result = $c->validator([
      'q' => [
          [sub{
              my ($req,$val) = @_;
          },'invalid']
      ],
  ]);
  
  my $result = $c->validator([
      'q' => [
          [[sub{
              my ($req,$val,@args) = @_;
          },0,1],'invalid']
      ],
  ]);


=head1 AUTHOR

原模块作者 Masahiro Nagano E<lt>kazeburo {at} gmail.comE<gt> 移植人: 扶凯 iakuf {at} 163.com

=head1 SEE ALSO

L<Kossy::Validator>

=head1 LICENSE

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

=cut


1;