package SPVM::Builder;

use strict;
use warnings;

use Carp 'confess';
use Scalar::Util 'weaken';

use SPVM::Builder::CC;

# This SPVM load is needed for SPVM::Builder XS method binding to Perl
# because SPVM::Builder XS method is loaded when SPVM is loaded
use SPVM();

# Fields
sub build_dir {
  my $self = shift;
  if (@_) {
    $self->{build_dir} = $_[0];
    return $self;
  }
  else {
    return $self->{build_dir};
  }
}

sub module_dirs {
  my $self = shift;
  if (@_) {
    $self->{module_dirs} = $_[0];
    return $self;
  }
  else {
    return $self->{module_dirs};
  }
}

sub compiler {
  my $self = shift;
  if (@_) {
    $self->{compiler} = $_[0];
    return $self;
  }
  else {
    return $self->{compiler};
  }
}

sub env {
  my $self = shift;
  if (@_) {
    $self->{env} = $_[0];
    return $self;
  }
  else {
    return $self->{env};
  }
}
sub runtime {
  my $self = shift;
  if (@_) {
    $self->{runtime} = $_[0];
    return $self;
  }
  else {
    return $self->{runtime};
  }
}

sub native_address_info {
  my $self = shift;
  if (@_) {
    $self->{native_address_info} = $_[0];
    return $self;
  }
  else {
    return $self->{native_address_info};
  }
}

sub precompile_address_info {
  my $self = shift;
  if (@_) {
    $self->{precompile_address_info} = $_[0];
    return $self;
  }
  else {
    return $self->{precompile_address_info};
  }
}

sub new {
  my $class = shift;
  
  my $self = {
    module_dirs => [map { "$_/SPVM" } @INC],
    @_
  };
  
  bless $self, ref $class || $class;
  
  # Create an environment
  $self->create_env;
  
  # Create the compiler
  $self->create_compiler;
  
  $self->native_address_info({});
  
  $self->precompile_address_info({});
  
  return $self;
}

sub print_error_messages {
  my ($self, $fh) = @_;

  my $error_messages = $self->get_error_messages;
  for my $error_message (@$error_messages) {
    printf $fh "[CompileError]$error_message\n";
  }
}

sub create_build_src_path {
  my ($self, $rel_file) = @_;
  
  my $build_dir = $self->build_dir;
  my $build_src_path = "$build_dir/work/src";
  if (defined $rel_file) {
    $build_src_path .= "/$rel_file";
  }
  
  return $build_src_path;
}

sub create_build_include_path {
  my ($self, $rel_file) = @_;
  
  my $build_dir = $self->build_dir;
  my $build_include_path = "$build_dir/work/include";
  if (defined $rel_file) {
    $build_include_path .= "/$rel_file";
  }
  
  return $build_include_path;
}

sub create_build_object_path {
  my ($self, $rel_file) = @_;
  
  my $build_dir = $self->build_dir;
  my $build_output_path = "$build_dir/work/object";
  if (defined $rel_file) {
    $build_output_path .= "/$rel_file";
  }
  
  return $build_output_path;
}

sub create_build_lib_path {
  my ($self, $rel_file) = @_;
  
  my $build_dir = $self->build_dir;
  my $build_lib_path = "$build_dir/work/lib";
  if (defined $rel_file) {
    $build_lib_path .= "/$rel_file";
  }
  
  return $build_lib_path;
}

sub get_dynamic_lib_file_dist {
  my ($self, $class_name, $category) = @_;

  my $module_module_file = $self->get_module_file($class_name);
  
  my $dynamic_lib_file = SPVM::Builder::Util::convert_module_file_to_dynamic_lib_file($module_module_file, $category);
  
  return $dynamic_lib_file;
}

sub build_dynamic_lib_dist {
  my ($self, $class_name, $category) = @_;

  my $compile_success = $self->compile_spvm($class_name, '(build_dynamic_lib_dist)', 0);
  unless ($compile_success) {
    $self->print_error_messages(*STDERR);
    exit(255);
  }

  # Build runtime information
  $self->build_runtime;

  my $cc_native = SPVM::Builder::CC->new(
    build_dir => $self->{build_dir},
    builder => $self,
  );
  
  my $method_names = $self->get_method_names($class_name, $category);
  $cc_native->build_dist($class_name, {category => $category});
}

sub build_and_bind_dynamic_lib_at_runtime {
  my ($self, $class_name, $category) = @_;
  
  my $cc = SPVM::Builder::CC->new(
    build_dir => $self->{build_dir},
    builder => $self,
    runtime => 1,
  );
  
  my $method_names = $self->get_method_names($class_name, $category);
  
  if (@$method_names) {
    # Shared library which is already installed in distribution directory
    my $dynamic_lib_file = $self->get_dynamic_lib_file_dist($class_name, $category);

    
    # Try runtime compile if shared library is not found
    unless (-f $dynamic_lib_file) {
      $dynamic_lib_file = $cc->build_runtime($class_name, {category => $category});
    }
    
    $self->bind_methods($cc, $dynamic_lib_file, $class_name, $category);
  }
}

sub bind_methods {
  my ($self, $cc, $dynamic_lib_file, $class_name, $category) = @_;

  my $method_names = $self->get_method_names($class_name, $category);
  my $method_infos = [];
  for my $method_name (@$method_names) {
    my $method_info = {};
    $method_info->{class_name} = $class_name;
    $method_info->{method_name} = $method_name;
    push @$method_infos, $method_info;
  }
  
  # Add anon class sub names if precompile
  if ($category eq 'precompile') {
    my $anon_class_names = $self->get_anon_class_names_by_parent_class_name($class_name);
    for my $anon_class_name (@$anon_class_names) {
      my $method_info = {};
      $method_info->{class_name} = $anon_class_name;
      $method_info->{method_name} = "";
      push @$method_infos, $method_info;
    }
  }
  
  for my $method_info (@$method_infos) {
    my $class_name = $method_info->{class_name};
    my $method_name = $method_info->{method_name};

    my $cfunc_name = SPVM::Builder::Util::create_cfunc_name($class_name, $method_name, $category);

    my $cfunc_address;
    if ($dynamic_lib_file) {
      my $dynamic_lib_libref = DynaLoader::dl_load_file($dynamic_lib_file);
      
      if ($dynamic_lib_libref) {

        $cfunc_address = DynaLoader::dl_find_symbol($dynamic_lib_libref, $cfunc_name);
        unless ($cfunc_address) {
          my $dl_error = DynaLoader::dl_error();
          my $error = <<"EOS";
Can't find native function \"$cfunc_name\" corresponding to ${class_name}->$method_name in \"$dynamic_lib_file\"

You must write the following definition.
--------------------------------------------------
#include <spvm_native.h>

int32_t $cfunc_name(SPVM_ENV* env, SPVM_VALUE* stack) {
  
  return 0;
}
--------------------------------------------------

$dl_error
EOS
          confess $error;
        }
      }
      else {
        my $dl_error = DynaLoader::dl_error();
        confess "Can't load dynamic_lib file \"$dynamic_lib_file\": $dl_error";
      }
    }
    else {
      confess "DLL file is not specified";
    }
    
    if ($category eq 'native') {
      $self->native_address_info->{$class_name}{$method_name} = $cfunc_address;
    }
    elsif ($category eq 'precompile') {
      $self->precompile_address_info->{$class_name}{$method_name} = $cfunc_address;
    }
  }
}

1;

=encoding utf8

=head1 Name

SPVM::Builder - Build SPVM program

=head1 Description

Build SPVM program. Compile SPVM source codes. Bind native and precompile methods. Generate Perl subrotuines correspoing to SPVM methods. After that, run SPVM program.