#!/usr/bin/php
<?php

require_once ("domframework/getopts.php");
require_once ("domframework/dblayeroo.php");

/** Generate the model files from an existing database
  * Provide the DSN to connect to the database, and the program will generate
  * the models/table.php files
  */
class modelGenerator
{
  /** The DSN provided by the user
    */
  private $dsn;

  /** The modelsDir provided by the user
    */
  private $modelsDir;

  /** The namespace name provided by the user
    */
  private $namespaceName;

  /** The dblayer object
    */
  private $db;

  /** The constructor
    */
  public function __construct ()
  {
    $getopts = new \getopts ();
    $getopts->add ("Help", "?h", "help", "Help of the software");
    $getopts->add ("DSN", "", "dsn:", "DSN - Data Source Name", "dsn");
    $getopts->add ("Output", "o:", "output:", "Output directory", "dir");
    $getopts->add ("Namespace", "n:", "namespace:",
                   "The namespace (if '', not added)", "namespaceName");
    $getopts->add ("Username", "u:", "username:", "Username to connect",
                   "username");
    $getopts->add ("Password", "p:", "password:", "Password to connect",
                   "password");
    if ($getopts->get ("Help"))
      die ($getopts->help ());
    if ($getopts->get ("DSN") === false)
    {
      file_put_contents ("php://stderr", "ERROR: The DSN is not provided\n");
      exit (1);
    }
    $dsn = $getopts->get ("DSN");
    $modelsDir = $getopts->get ("Output");
    if ($modelsDir === false)
      $modelsDir = "./models";
    if (! file_exists ($modelsDir) || ! is_dir ($modelsDir))
    {
      file_put_contents ("php://stderr",
    "ERROR: The modelsDir '$modelsDir' doesn't exists or is not a directory\n");
      exit (1);
    }

    $this->dsn = $dsn;
    $this->modelsDir = $modelsDir;
    $this->namespaceName = $getopts->get ("Namespace");
    $this->db = new \dblayeroo ($dsn,
                                $getopts->get ("Username"),
                                $getopts->get ("Password"));
  }

  /** List all the existing tables in the database
    */
  public function listTables ()
  {
    return $this->db->listTables ();
  }

  /** Create the model file from the $tableName
    * @param string $tableName The table to examine
    */
  public function createModel ($tableName)
  {
    if (file_exists ($this->modelsDir."/$tableName".".php"))
    {
      file_put_contents ("php://stderr",
        "WARNING: File ".$this->modelsDir."/$tableName".".php already exists. ".
        "SKIP\n");
      return;
    }
    echo "Create File ".$this->modelsDir."/$tableName".".php\n";
    $schema = $this->db->getTableSchema ($tableName);
    $f = "";
    $f .= "<"."?"."php\n\n";
    if ($this->namespaceName === false)
      $f .= "namespace models;\n\n";
    elseif ($this->namespaceName !== "")
      $f .= "namespace $this->namespaceName;\n\n";
    $f .= "require_once (\"domframework/dblayeroo.php\");\n\n";
    $f .= "/** The model for $tableName table in the database\n  */\n";
    $f .= "class $tableName extends \dbalyeroo\n";
    $f .= "{\n";
    $f .= "  /** The constructor connect to database\n    */\n";
    $f .= "  public function __construct ()\n  {\n";
    $f .= "    // The table name\n";
    $f .= "    \$this->table (\"$tableName\");\n\n";
    $f .= "    // The fields name and parameters\n";
    $f .= "    \$this->fields (array (\n";
    foreach ($schema["fields"] as $field=>$params)
    {
      $f .= "      \"$field\" => array (\"".implode ("\", \"", $params).
            "\"),\n";
    }
    $f .= "    ));\n\n";
    $f .= "    // The primary key\n";
    $f .= "    \$this->primary (\"".$schema["primary"]."\");\n\n";
    if (count ($schema["unique"]))
    {
      $f .= "    // The unique constraints\n";
      $f .= "    \$this->unique (array (\n";
      foreach ($schema["unique"] as $unique)
      {
        if (is_array ($unique))
          $f .= "      array (\"".implode ("\", \"", $unique)."\"),\n";
        else
          $f .= "      array (\"$unique\"),\n";
      }
      $f .= "    ));\n\n";
    }
    $f .= "    // The titles\n";
    $f .= "    \$this->titles = array (\n";
    foreach ($schema["fields"] as $field=>$params)
    {
      $f .= "      \"$field\" => _(\"$field\"),\n";
    }
    $f .= "    );\n\n";
    if (count ($schema["foreign"]))
    {
      $f .= "    // The foreign constraints\n";
      $f .= "    \$this->foreign = array (\n";
      foreach ($schema["foreign"] as $field=>$params)
        $f .= "      \"$field\" => array (\"". implode ("\", \"", $params).
              "\"),\n";
      $f .= "    );\n";
    }

    $f .= "  }\n";
    $f .= "}\n";
    file_put_contents ($this->modelsDir."/$tableName".".php", $f);
  }
}

$modelGenerator = new modelGenerator ();
$tables = $modelGenerator->listTables ();
foreach ($tables as $tableName)
  $modelGenerator->createModel ($tableName);