<?php
namespace foo\base;
use foo\base\Object;
use foo\base\Compiler;
/**
* 
*/
class Template extends Object
{
  private $_config = [
    'suffix' => '.php',//文件后綴名
    'templateDir' => '../views/',//模板所在文件夾
    'compileDir' => '../runtime/cache/views/',//編譯后存放的目錄
    'suffixCompile' => '.php',//編譯后文件后綴
    'isReCacheHtml' => false,//是否需要重新編譯成靜態(tài)html文件
    'isSupportPhp' => true,//是否支持php的語法
    'cacheTime' => 0,//緩存時間,單位秒
  ];
  private $_file;//帶編譯模板文件
  private $_valueMap = [];//鍵值對
  private $_compiler;//編譯器
  public function __construct($compiler, $config = [])
  {
    $this->_compiler = $compiler;
    $this->_config = array_merge($this->_config, $config);
  }
  /**
   * [assign 存儲控制器分配的鍵值]
   * @param [type] $values [鍵值對集合]
   * @return [type]     [description]
   */
  public function assign($values)
  {
    if (is_array($values)) {
      $this->_valueMap = $values;
    } else {
      throw new \Exception('控制器分配給視圖的值必須為數組!');
    }
    return $this;
  }
  /**
   * [show 展現視圖]
   * @param [type] $file [帶編譯緩存的文件]
   * @return [type]    [description]
   */
  public function show($file)
  {
    $this->_file = $file;
    if (!is_file($this->path())) {
      throw new \Exception('模板文件'. $file . '不存在!');
    }
    $compileFile = $this->_config['compileDir'] . md5($file) . $this->_config['suffixCompile'];
    $cacheFile = $this->_config['compileDir'] . md5($file) . '.html';
    //編譯后文件不存在或者緩存時間已到期,重新編譯,重新生成html靜態(tài)緩存
    if (!is_file($compileFile) || $this->isRecompile($compileFile)) {
      $this->_compiler->compile($this->path(), $compileFile, $this->_valueMap);
      $this->_config['isReCacheHtml'] = true;
      if ($this->isSupportPhp()) {
        extract($this->_valueMap, EXTR_OVERWRITE);//從數組中將變量導入到當前的符號表
      }
    }
    if ($this->isReCacheHtml()) {
      ob_start();
      ob_clean();
      include($compileFile);
      file_put_contents($cacheFile, ob_get_contents());
      ob_end_flush();
    } else {
      readfile($cacheFile);
    }
  }
  /**
   * [isRecompile 根據緩存時間判斷是否需要重新編譯]
   * @param [type] $compileFile [編譯后的文件]
   * @return boolean       [description]
   */
  private function isRecompile($compileFile)
  {
    return time() - filemtime($compileFile) > $this->_config['cacheTime'];
  }
  /**
   * [isReCacheHtml 是否需要重新緩存靜態(tài)html文件]
   * @return boolean [description]
   */
  private function isReCacheHtml()
  {
    return $this->_config['isReCacheHtml'];
  }
  /**
   * [isSupportPhp 是否支持php語法]
   * @return boolean [description]
   */
  private function isSupportPhp()
  {
    return $this->_config['isSupportPhp'];
  }
  /**
   * [path 獲得模板文件路徑]
   * @return [type] [description]
   */
  private function path()
  {
    return $this->_config['templateDir'] . $this->_file . $this->_config['suffix'];
  }
}