package Configuration;
our $DataDir;
package Schema::DataSource;
use Common;
use strict;
use base qw(Object);

use BNFCompiler;
use Schema::DB;
use Schema;
use URI::file;

BEGIN {
    DeclareProperty ProcessedSchemas => ACCESS_NONE;  #{ uri => schema }
    DeclareProperty Types => ACCESS_READ; # Schema
    DeclareProperty DataSourceBuilder => ACCESS_READ;
    DeclareProperty Compiler => ACCESS_NONE;
}

sub CTOR {
    my ($this,%args) = @_;
    
    $this->{$DataSourceBuilder} = $args{'DataSourceBuilder'} or die new Exception('A data source builder is required');
    $this->{$Types} = new Schema;
    $this->{$Compiler} = new BNFCompiler(SchemaCache => "${DataDir}Cache/",Transform => sub { BNFCompiler::DOM::TransformDOMToHash(@_,{skip_spaces => 1})} );
    $this->{$Compiler}->LoadBNFSchema(file => 'Schema/schema.def');
}

sub as_list {
    return( map { UNIVERSAL::isa($_,'ARRAY') ? @{$_} : defined $_ ? $_ : () } @_ );
}

sub ProcessSchema {
    my ($this,$uriFile) = @_;
    
    return 1 if $this->{$ProcessedSchemas}{$uriFile->as_string};
    
    my $uriDir = URI::file->new('./')->abs($uriFile);
    $this->{$ProcessedSchemas}->{$uriFile->as_string} = 1;
    
    my $Schema = $this->ParseSchema($uriFile);
    
    foreach my $item (as_list($Schema->{'header'}{'include_item'})) {
        my $uriItem = URI::file->new($item->{'file_name'})->abs($uriDir);
        $this->ProcessSchema($uriItem);
    }
    
    $this->ConstructTypes($Schema);
    
}

sub ParseSchema {
    my ($this,$fileUri) = @_;
    
    my $fileName = $fileUri->file;
    open my $hfile,"$fileName" or die new Exception('Failed to read the file',$fileName,$!);
    local $/ = undef;
    my $Schema = $this->{$Compiler}->Parse(<$hfile>);

    return $Schema;
}

sub ConstructTypes {
    my ($this,$schema) = @_;
    return if not $schema->{'class'};
    
    foreach my $class (as_list($schema->{'class'})){
        # объявление типа
        my $type;
        my $builder;
        if ($class->{'type_definition'}{'args_list'}) {
            $type = $this->{$Types}->CreateTemplate($class->{'type_definition'}{'name'},as_list($class->{'type_definition'}{'args_list'}{'name'}));
        } else {
            $type = $this->{$Types}->CreateType($class->{'type_definition'}{'name'});
        }
        
        $type->SetAttributes(ValueType => 1) if $class->{'value_type'};
        
        my $mappingTip = $this->{$DataSourceBuilder}->GetClassMapping($type);
        
        
        # обрабатываем список базовых классов
        
        if ($class->{'base_types'}) {
            foreach my $typename (as_list($class->{'base_types'}{'type'})) {
                $type->AddBase(MakeTypeName($typename));
            }
        }
        
        # обрабатываем список свойств
        if ($class->{'property_list'}) {
            foreach my $property (as_list($class->{'property_list'}{'property'})) {
                $type->InsertProperty($property->{'name'},MakeTypeName($property->{'type'}));
                if (my $mapping = $property->{'mapping'}) {
                    $mappingTip->PropertyMapping($property->{'name'},Column => $mapping->{'column_name'},DBType => $mapping->{'db_type'});
                }
            }
        }
    }
}

sub MakeTypeName {
    my ($typename) = @_;
    
    return new Schema::TypeName(
        $typename->{'name'},
        (
            $typename->{'template_list'} ?
                map { MakeTypeName($_) } as_list($typename->{'template_list'}{'type'})
            :
                ()
        )
    );
}

sub BuildSchema {
    my ($this,$fileName) = @_;
    
    my $uriFile = URI::file->new_abs($fileName);
    
    $this->ProcessSchema($uriFile);
    
    $this->{$Types}->Close();

    foreach my $type ($this->{$Types}->EnumTypes(skip_templates => 1)) {
        $this->{$DataSourceBuilder}->AddType($type);
    }
}

sub DESTROY {
    my ($this) = @_;
    
    $this->{$Compiler}->Dispose;
    $this->{$DataSourceBuilder}->Dispose;
    $this->{$Types}->Dispose;
}

1;