<?php

  class mw_env_plugins extends mw_env{

    public $plugins_asc;
    public $plugins_desc;

    public function plugins($PRIORITE = "ASC"){
      if(!isset($this->plugins_asc) || !isset($this->plugins_desc)){
        return false;
      }
      if($PRIORITE == "ASC") return $this->plugins_asc;
      if($PRIORITE == "DESC") return $this->plugins_desc;
      return false;
    }

    public function plugin($plugin_name){
      if(!isset($this->plugins_asc) || isset($this->plugins_desc)){
        return false;
      }
      if(!isset($this->plugins_asc[$plugin_name])){
        return false;
      }
      return $this->plugins_asc[$plugin_name];
    }

    # ---------------------------------------------------------------------------------
    #                                                                              init
    #

    public function load_plugins($RELOAD = false){
      if(!$RELOAD && isset($this->plugins_asc) && isset($this->plugins_desc)){
        return true;
      }
      $this->plugins_asc = array();
      $this->plugins_desc = array();
      if(!($dh = opendir($this->path("mw_dir")."plugins/"))){
        return false;
      }
      $OK = true;
      while($OK && ($plugin_name = readdir($dh)) !== false){
        if(substr($plugin_name, 0 ,1) !== "." && is_dir($this->path("mw_dir")."plugins/".$plugin_name)){
          if(($plugin = $this->load_plugin($plugin_name)) === false){
            $OK = false;
          }
        }
      }
      closedir($dh);
      if(!$OK){
        return false;
      }
      if(($plugins = $this->plugins()) === false){
        return false;
      }
      if(file_exists($this->plugins_data_dir()) && is_dir($this->plugins_data_dir())){
        if(!($dh = opendir($this->plugins_data_dir()))){
          return false;
        }
        while(($plugin_name = readdir($dh)) !== false){
          if(substr($plugin_name, 0 ,1) != "." && !is_dir($this->plugin_data_file($plugin_name))){
            if(!isset($plugins[$plugin_name])) $this->del_plugin_data($plugin_name);
          }
        }
        closedir($dh);
      }
      return true;
    }

    public function load_plugin($plugin_name){
      if(substr($plugin_name, 0 ,1) == "." || !is_dir($this->path("mw_dir")."plugins/".$plugin_name)){
        return false;
      }
      if(($plugin = $this->plugin_data($plugin_name)) === false){
        return false;
      }
      if(($plugin["impl"] = $this->plugin_impl($plugin_name)) === false){
        return false;
      }
      $MAJ = false;
      if(!isset($plugin["installed"]) || !isset($plugin["enabled"])){
        $plugin["installed"] = false;
        $plugin["enabled"] = false;
        $plugin["priorite"] = 0;
        $MAJ = true;
      }
      if(!$plugin["installed"] && $plugin["enabled"]){
        $plugin["enabled"] = false;
        $MAJ = true;
      }
      if($MAJ){
        if(!$this->set_plugin_data($plugin_name, $plugin)){
          return false;
        }
      }
      $plugin["title"] =  ($plugin_title = $this->plugin_call($plugin["impl"], "title")) ? $plugin_title : "";
      $plugin["description"] = ($plugin_description = $this->plugin_call($plugin["impl"], "description")) ? $plugin_description : "";
      $plugin["name"] = $plugin_name;
      if(!isset($this->plugins_asc)) $this->plugins_asc = array();
      $this->plugins_asc[$plugin_name] = $plugin;
      $this->plugins_asc = $this->ordonne_plugins($this->plugins_asc, "ASC");
      $this->plugins_desc = $this->ordonne_plugins($this->plugins_asc, "DESC");
      return $plugin;
    }

    public function plugins_loaded(){
      if(($plugins = $this->plugins()) === false){
        return;
      }
      foreach($plugins as $plugin_name => $plugin){
        $plugin["impl"]->loaded($this);
      }
    }

    public function init_plugins(){
      if($this->bdd_ready() !== true) return;
      if(($plugins = $this->plugins("DESC")) === false){
        $this->erreur("erreur lors de l'initialisation des plugins", true);
      }
      foreach($plugins as $plugin_name => $plugin){
        if($plugin["installed"] && $plugin["enabled"]){
          if(!$plugin["impl"]->init($this)){
            $this->erreur("erreur lors de l'initialisation du plugin ".$plugin_name, true);
          }
        }
      }
    }

    public function ordonne_plugins($plugins, $PRIORITE = "ASC"){
      $values = array_values($plugins);
      $maximum = count($values);
      while($maximum > 0){
        $maximumTemporaire = 0;
        for($i = 0; $i < $maximum - 1; $i++){
          if(
               ($PRIORITE == "ASC" && $values[$i]["priorite"] > $values[$i + 1]["priorite"])
            || ($PRIORITE == "DESC" && $values[$i]["priorite"] < $values[$i + 1]["priorite"])
          ){
            $tmp = $values[$i];
            $values[$i] = $values[$i + 1];
            $values[$i + 1] = $tmp;
            $maximumTemporaire = $i + 1;
          }
        }
        $maximum = $maximumTemporaire;
      }
      $res = array();
      foreach($values as $value) if($value["name"]) $res[$value["name"]] = $value;
      return $res;
    }

    public function plugin_call($impl, $method){
      if(method_exists($impl, $method)) return $impl->$method($this);
    }

    # ---------------------------------------------------------------------------------
    #                                                                              impl
    #

    public function plugin_impl($plugin_name){
      $plugin = false;
      if(file_exists($this->path("mw_dir")."plugins")){
        if(substr($plugin_name, 0 ,1) !== "." && is_dir($this->path("mw_dir")."plugins/".$plugin_name)){
          if(file_exists($this->path("mw_dir")."plugins/".$plugin_name."/".$plugin_name.".php")){
            if(!class_exists($plugin_name)){
              require_once $this->path("mw_dir")."plugins/".$plugin_name."/".$plugin_name.".php";
            }
            if(class_exists($plugin_name)){
              $plugin = new $plugin_name();
            }
          }
        }
      }
      return $plugin;
    }

    # ---------------------------------------------------------------------------------
    #                                                                              data
    #

    public function plugins_data_dir(){
      return $this->path("content")."data/plugins/";
    }

    public function plugin_data_file($plugin_name){
      return $this->plugins_data_dir().$plugin_name;
    }

    public function plugin_data($plugin_name){
      $data_file = $this->plugin_data_file($plugin_name);
      $data = array();
      if(file_exists($data_file)){
        if($content = file_get_contents($data_file)){
          $data = unserialize($content);
        }
      }
      return $data;
    }

    public function set_plugin_data($plugin_name, $data){
      if(!is_dir($this->plugins_data_dir())) @mkdir($this->plugins_data_dir());
      if(!is_dir($this->plugins_data_dir())) return false;
      $data_file = $this->plugin_data_file($plugin_name);
      $content = serialize($data);
      $OK = false;
      if($fh = fopen($data_file, "w")){
        if(fwrite($fh, $content) !== false){
          $OK = true;
        }
        fclose($fh);
      }
      return $OK;
    }

    public function del_plugin_data($plugin_name){
      $data_file = $this->plugin_data_file($plugin_name);
      if(file_exists($data_file)) return @unlink($data_file);
      return true;
    }

  }

  // -------------------------------------------------------------------------------------------
  //                                                                             class mw_plugin
  //

  abstract class mw_plugin{

    public function title(){
      return "(sans titre)";
    }

    public function description(){
      return "";
    }

    public function loaded($env){
    }

    public function install($env){
      return true;
    }

    public function uninstall($env){
      return true;
    }

    public function enable($env){
      return true;
    }

    public function disable($env){
      return true;
    }

    public function init($env){
      return true;
    }

  }