<?php
require_once(__DIR__ . '/type.inc.php');
require_once(__DIR__ . '/scope.inc.php');
require_once(__DIR__ . '/struct.inc.php');
require_once(__DIR__ . '/enum.inc.php');
require_once(__DIR__ . '/func.inc.php');
require_once(__DIR__ . '/interface.inc.php');
require_once(__DIR__ . '/service.inc.php');
require_once(__DIR__ . '/util.inc.php');

class mtgMetaInfo
{
  public static $BUILTIN_TYPES = array(
    'int8', 'int16', 'int32', 'uint8', 'uint16', 'uint32', 
    'float', 'double', 'uint64', 'int64', 'bool', 'string', 'blob'
  );

  private $units = array();

  private $factory_types = array();

  function addUnit(mtgMetaInfoUnit $unit)
  {
    if(isset($this->units[$unit->object->getName()]))
      throw new Exception("Meta info unit '{$unit->object->getName()}' already defined in file '{$this->units[$unit->object->getName()]->file}'");

    $this->units[$unit->object->getName()] = $unit;

    if($unit->object instanceof mtgMetaStruct)
      $this->_registerFactoryStruct($unit->object);
    else if($unit->object instanceof mtgMetaService)
    {
      foreach($unit->object->getUserTypes() as $user_type)
        if($user_type instanceof mtgMetaStruct)
          $this->_registerFactoryStruct($user_type);
    }
  }

  function delUnit(mtgMetaInfoUnit $unit)
  {
    unset($this->units[$unit->object->getName()]);

    if($unit->object instanceof mtgMetaStruct)
      $this->_unregisterFactoryStruct($unit->object);
    else if($unit->object instanceof mtgMetaService)
    {
      foreach($unit->object->getUserTypes() as $user_type)
        if($user_type instanceof mtgMetaStruct)
          $this->_unregisterFactoryStruct($user_type);
    }
  }

  function getUnits() : array
  {
    return $this->units;
  }

  function findUnit($id) : ?mtgMetaInfoUnit
  {
    if(isset($this->units[$id]))
      return $this->units[$id];
    return null;
  }

  function getUnit($id) : mtgMetaInfoUnit
  {
    $unit = $this->findUnit($id);
    if(!$unit)
      throw new Exception("Unit '$id' not found");
    return $unit;
  }

  private function _registerFactoryStruct(mtgMetaStruct $struct)
  {
    if(isset($this->factory_types[$struct->getClassId()]))
      throw new Exception("Factory user type with id '{$struct->getClassId()}' already defined for type '{$this->factory_types[$struct->getClassId()]->getName()}'");

    $this->factory_types[$struct->getClassId()] = $struct;
  }

  private function _unregisterFactoryStruct(mtgMetaStruct $struct)
  {
    unset($this->factory_types[$struct->getClassId()]);
  }

  function getFactoryTypes() : array
  {
    return $this->factory_types;
  }

  function validate()
  {
    foreach($this->units as $u)
      $u->object->validate($this);
  }
}

class mtgMetaInfoUnit
{
  public ?mtgMetaParsedModule $module = null;
  public string $file;
  public mtgMetaUnit $object;

  function __construct(mtgMetaParsedModule|string $file_or_module, mtgMetaUnit $obj)
  {
    if($file_or_module instanceof mtgMetaParsedModule)
    {
      $this->module = $file_or_module;
      $this->file = $file_or_module->file;
    }
    else
    {
      $this->module = null;
      $this->file = $file_or_module;
    }

    $this->object = $obj;
  }
}

//NOTE: represents a meta symbol
abstract class mtgMetaUnit
{
  protected ?mtgScope $scope = null;

  protected ?mtgOrigin $origin;

  protected $tokens = array();

  abstract function getName() : string;

  function setScope(mtgScope $scope)
  {
    $this->scope = $scope;
  }

  function getScope() : ?mtgScope
  {
    return $this->scope;
  }

  function setOrigin(mtgOrigin $origin)
  {
    $this->origin = $origin;
  }

  function getOrigin() : ?mtgOrigin
  {
    return $this->origin;
  }

  function getTokens() : array
  {
    return $this->tokens;
  }

  function setTokens(array $tokens)
  {
    $this->tokens = $tokens;
  }

  function setToken(string $name, mixed $val)
  {
    $this->tokens[$name] = $val;
  }

  function delToken(string $name)
  {
    unset($this->tokens[$name]);
  }

  function getToken(string $name) : mixed
  {
    return $this->hasToken($name) ? $this->tokens[$name] : null; 
  }

  function hasToken(string $name) : bool
  {
    return array_key_exists($name, $this->tokens);
  }

  abstract function validate(mtgMetaInfo $meta);
}

class mtgOrigin
{
  public $file;
  public $line;

  function __construct($file = '', $line = 0)
  {
    $this->file = $file;
    $this->line = $line;
  }

  function __toString()
  {
    return "{$this->file}@{$this->line}";
  }
}