<?php
/** DomFramework
    @package domframework
    @author Dominique Fournier <dominique@fournier38.fr> */

require_once ("domframework/form.php");

/** Manage the configurations of the module done by administrator in a config
    file
    It is based on the module configuration defaults
    The DocType allow to define the configuration HTML page. It must contains
    @param : the name of the parameter
    @description : the textual description of the parameter
    @type : the type of the parameter (string, integer, array)
    @values : an array containing the allowed values to the parameter. Can be
              a function like timezone_identifiers_list
    @default : the default value (can be an array or a string or a number)
    @group : Group all the parameters in a group
    POC :
$config = new config();
$config->default = array ("param"=>"default",
                          "param2"=>array (1,2,3),
                          "param3"=>null);
$var = $config->get ("param");
  */
class config
{
  /** All the parameters allowed with their default value */
  public $default = array ();
  /** Use the .php to protect the information */
  public $confFile = null;

  /** Select the configuration file */
  public function selectConfFile ()
  {
    if ($this->confFile !== null)
      $this->confFile = $this->confFile;
    elseif (defined("CONFIGFILE"))
      $this->confFile = CONFIGFILE;
    elseif (file_exists ("./datas/configuration.php"))
      $this->confFile = "./datas/configuration.php";
    elseif (file_exists ("./data/configuration.php"))
      $this->confFile = "./data/configuration.php";
    else
      $this->confFile = "./data/configuration.php";
  }

  /** List all the parameters configurable in the software */
  public function params ()
  {
    $this->selectConfFile ();
    return $this->default;
  }

  /** Return the defined values */
  public function getAll ()
  {
    $this->selectConfFile ();
    $conf = array ();
    $rc = include ($this->confFile);
    if ($rc !== 1)
      throw new Exception ("Error in configuration file", 500);
    return $conf;
  }

  /** Get the value of the provided parameter recorded in .php file
      If it is not set in .php file, use the default value
      @param string $param The option name to be returned */
  public function get ($param)
  {
    $this->selectConfFile ();
    if (!array_key_exists ($param, $this->default))
      throw new Exception ("Unknown configuration parameter '$param'", 500);
    if (!file_exists ($this->confFile))
    {
      if (@file_put_contents ($this->confFile,
                              "<?php\r\n\$conf = array ();\r\n")
          === FALSE)
        throw new Exception (sprintf (dgettext("domframework", 
                "No configuration file '%s' available and it can't be created"),
                $this->confFile), 500);
    }
    elseif (! is_readable ($this->confFile))
      throw new Exception (sprintf ( dgettext("domframework", 
                               "The configuration file '%s' is not readable"),
                                $this->confFile));
    $conf = array ();
    $rc = include ($this->confFile);
    if ($rc !== 1)
      throw new Exception ("Error in configuration file", 500);
    if (! array_key_exists ($param, $this->default))
      throw new Exception (sprintf ("Configuration parameter '%s' not defined",
                                    $param), 500);
    // Create a conf where all the keys are defined. If the keys are already
    // define, use them, or use the default ones
    // Don't allow keys not defined in default ones
    if (! is_array ($this->default[$param]))
    {
      if (! array_key_exists ($param, $conf))
        return $this->default[$param];
      return $conf[$param];
    }
    foreach ($this->default[$param] as $key=>$val)
    {
      if ($key === "not configured")
      {
        if (! array_key_exists ($param, $conf))
          continue;
        foreach ($conf[$param] as $k=>$v)
        {
          $conf[$param][$k] = array_replace_recursive ($val,
                                                       $conf[$param][$k]);
        }
        continue;
      }
      if (! isset ($conf[$param][$key]))
        $conf[$param][$key] = $val;
      elseif (is_array ($val))
        $conf[$param][$key] = array_replace_recursive ($val,
                                                       $conf[$param][$key]);
    }
    if (! array_key_exists ($param, $conf))
      return $this->default[$param];
    return $conf[$param];
  }

  /** Define a value for the parameter in the config file. Add all the default
      values if they are not defined
      @param string $param The option name
      @param mixed $value The option value
      @return TRUE if the parameter is saved or an exception */
  public function set ($param, $value)
  {
    $this->selectConfFile ();
    if (!array_key_exists ($param, $this->default))
      throw new Exception ("Unknown parameter '$param'", 500);
    if (!file_exists ($this->confFile))
    {
      if (@file_put_contents ($this->confFile,
                              "<?php\r\n\$conf =array ();\r\n")
          === FALSE)
        throw new Exception (sprintf (
                 "No configuration file '%s' available and it can't be created",
                 $this->confFile));
    }
    elseif (! is_readable ($this->confFile))
      throw new Exception (sprintf (
                               dgettext("domframework", 
                               "The configuration file '%s' is not readable"),
                                $this->confFile), 500);
    if (!is_writeable ($this->confFile))
      throw new Exception (sprintf (dgettext("domframework", 
                                  "Configuration file '%s' is write protected"),
                                   $this->confFile), 500);
    $conf = array ();
    $rc = include ($this->confFile);
    if ($rc !== 1)
      throw new Exception (dgettext("domframework",
                                    "Error in configuration file"), 500);
    $newconf = array_merge ($this->default, $conf, array ($param=>$value));
    $txt = "<?php\r\n";
    $txt .= "\$conf = array(\r\n";
    $txt = $this->writePHP ($newconf, $txt, 4);
    $txt .= ");\r\n";

    if (@file_put_contents ($this->confFile, $txt, LOCK_EX) === FALSE)
      throw new Exception (sprintf (dgettext("domframework", 
                                    "Can't save configuration file '%s'"),
                                    $this->confFile), 500);
    return TRUE;
  }

  /** Display the $values in PHP format to be "require" easily
      @param mixed $values Values to be recorded
      @param string $phpcode Actual value of the php code
      @param integer $indent Number of spaces in the indentation of config */
  private function writePHP ($values, $phpcode, $indent)
  {
    foreach ($values as $key=>$val)
    {
      $phpcode .= str_pad (" ", $indent);
      $phpcode .= (is_numeric ($key)) ? $key : "\"$key\"";
      $phpcode .= " => ";
      if (is_bool ($val))
      {
        if ($val === FALSE) $phpcode .= "FALSE,\r\n";
        else $phpcode .= "TRUE,\r\n";
      }
      elseif (is_null ($val))
        $phpcode .= "NULL,\r\n";
      elseif (is_int ($val) || is_float ($val))
        $phpcode .= "$val,\r\n";
      elseif (is_string ($val))
        $phpcode .= "\"$val\",\r\n";
      elseif (is_array ($val))
      {
        $phpcode .= "array (\r\n";
        $phpcode = $this->writePHP ($val, $phpcode, $indent+4);
        $phpcode .= str_pad (" ", $indent);
        $phpcode .= "),\r\n";
      }
      else
        throw new Exception (dgettext("domframework", 
                             "Config : missing type ").gettype ($val), 500);
    }

    return $phpcode;
  }

  /** Convert a string to the right PHP type, without using the eval function */
  private function strToType ($values)
  {
    $values = str_replace ("array (", "array(", $values);
    if (stripos ($values, "array(") !== false)
    {
      $values = substr ($values, 6, -1);
      $values = explode (",", $values);
      $new = array ();
      foreach ($values as $key=>$val)
      {
        $val = trim ($val);
        if (strpos ($val, "=>") !== false)
        {
          // Associated array 
          unset ($values[$key]);
          list ($key1, $val1) = explode ("=>", $val);
          $key1 = trim ($key1);
          $val1 = trim ($val1);
          if ($val1[0] === "\"" || $val1[0] === "'")
            $val1 = substr($val1, 1, -1);
          elseif (strpos ($val1, "."))
            $val1 = floatval ($val1);
          else
            $val1 = intval ($val1);
          $new[$key1] = $val1;
        }
        else
        {
          // Unique value (string or integer or float)
          if ($val[0] === "\"" || $val[0] === "'")
            $val = substr($val, 1, -1);
          elseif (strpos ($val, "."))
            $val = floatval ($val);
          else
            $val = intval ($val);
          $new[$key] = $val;
        }
      }
    }
    else
    {
      if ($values[0] === "\"" || $values[0] === "'" )
        $new = substr ($values, 1, -1);
      elseif (strpos ($values, "."))
        $new = floatval ($values);
      else
        $new = intval ($values);
    }
    return $new;
  }

  /** Return an array containing the definitions read from the default config
      file */
  public function docComment ($modelFile)
  {
    $debug = 0;
    if (! file_exists ($modelFile))
      throw new Exception (dgettext("domframework",
                           "The configuration model file is missing"), 500);
    if (! is_readable ($modelFile))
      throw new Exception (dgettext("domframework",
                           "The configuration model file is not readable"),
                           500);
    $filecontent = file_get_contents ($modelFile);
    $tokens = token_get_all ($filecontent);
    $foundDefault = "";
    $parenthesis = 0;
    $params = array ();
    $path = "";
    $group = dgettext("domframework", "Default parameters");
    foreach ($tokens as $token)
    {
      if (is_array ($token))
      {
        list ($id, $text) = $token;
        if ($debug) echo "ARRAY : $id, $text\n";
        if ($foundDefault === "" && $text === "->")
          $foundDefault = $text;
        if ($id === T_DOC_COMMENT)
        {
          // Look at @param, @description,@type, @values, @default
          if ($debug) echo "DOC_COMMENT : $text\n";
          // Append the not completed lines
          $text = trim (substr ($text, 3, -2));
          $text = preg_replace ("/\n\s+/", " ", $text);
          $text = preg_replace (
                    "/(@(param|description|type|values|default|group|prefix))/",
                    "\n\${1}", $text);
          $text = ltrim ($text);
          // Look at each parameter and save them in a data array
          $data = array ();
          foreach (explode ("\n", $text) as $line)
          {
            $tmp = explode (" ", $line);
            $key = reset ($tmp);
            $key = substr ($key, 1);
            $data[$key] = trim (implode (" ",array_slice ($tmp, 1)));
          }
          if (isset ($data["group"]))
            $group = $data["group"];
          if (! isset ($data["param"]))
            continue;
          $data["depth"] = $parenthesis;
          $data["group"] = $group;
          //if (isset ($data["values"]) && $data["values"][0] !== "\"")
          if (isset ($data["values"]))
          {
            // A function or an array or a number is provided
            if ( function_exists ($data["values"]))
              $data["values"] = call_user_func ($data["values"]);
            elseif (is_string ($data["values"]))
              $data["values"] = $this->strToType ($data["values"]);
          }
          if (isset ($data["default"]))
            $data["default"] = $this->strToType ($data["default"]);
          if (isset ($data["prefix"]))
            $data["prefix"] = $this->strToType ($data["prefix"]);
          if ($debug) var_dump ($data);
          $params[] = $data;
        }
      }
      else
      {
        if ($debug) echo "TEXT  : $token\n";
        if ($foundDefault !== "" && $token === "(")
        {
          $parenthesis++;
        }
        if ($foundDefault !== "" && $token === ")")
        {
          $parenthesis--;
          if ($parenthesis === 0)
            break;
        }
      }
    }
    return $params;
  }
}