<?php

declare(strict_types=1);

/** 
 * @author Robert Strutts <Robert@TryingToScale.com>
 * @copyright Copyright (c) 2022, Robert Strutts.
 * @license https://mit-license.org/
 */


namespace tts;

final class view {
  public $white_space_control = false;
  private $vars = array();
  private $project_dir;
  private $files = array();  
  private $template = false;
  private $use_template_engine = false;
  private $template_type = 'tpl';
  protected $tempalte_engine = null;

  public function __construct() {
      $this->project_dir = \bs_tts\site_helper::get_project();
  }
  
  private function get_file(string $view_file, string $default, string $render_path = 'project'): string {
    $file_ext = \bs_tts\common::get_string_right($view_file, 4);
    if (! \bs_tts\common::is_string_found($file_ext, '.')) {
      $view_file .= '.php';
    }
    if ($render_path === 'tts') {
        $file = (empty($default)) ? "views/{$view_file}" : "views/{$default}/{$view_file}";
        $path = \main_tts\TTS_FRAMEWORK;
    } else {
        $file = (empty($default)) ? "{$this->project_dir}/views/{$view_file}" : "{$this->project_dir}/views/{$default}/{$view_file}";
        $path = \bs_tts\site_helper::get_root();
    }
    $vf = $path . $file;
    if ( \bs_tts\requires::safer_file_exists($vf) !== false) {
      return $file;
    }
    return '';
  }

   /**
   *  Alias to set_view 
   */
  public function include(string $file, string $render_path = 'project'): void {
    $this->set_view($file, $render_path);
  }
  
  /**
   *  Alias to set_view 
   */
  public function add_view(string $file, string $render_path = 'project'): void {
    $this->set_view($file, $render_path);
  }

  private function find_view_path(string $view_file, string $render_path) {
    $found = false;

    $default_paths = \main_tts\configure::get('view_mode', 'default_paths');
    $get = \tts\misc::request_var('render');
    if (in_array($get, $default_paths)) {
      if (($key = array_search($get, $default_paths)) !== false) {
        unset($default_paths[$key]); // Remove as we'll make it first later...
      }
      array_unshift($default_paths, $get); // Make First in Array!
    }
    
    foreach ($default_paths as $default) {
      $file = $this->get_file($view_file, $default, $render_path);
      if ( ! empty($file) ) {
        $found = true;
        break;
      }
    }
    return ($found) ? $file : false;
  }
  
  private function find_template_path($tpl_file, $render_path) {
    $file = "{$this->project_dir}/views/includes/{$tpl_file}";
    $path = ($render_path === 'project') ? \bs_tts\site_helper::get_root() : \main_tts\TTS_FRAMEWORK;
    $vf = $path . $file;
    
    return \bs_tts\requires::safer_file_exists($vf);
  }
  
  /**
   * Use View File
   * @param string $view_file
   * @param string $render_path
   * @throws Exception
   */
  public function set_view(string $view_file = null, string $render_path = 'project'): void {
    if ($view_file === null) {
      return;
    }

    $file_ext = \bs_tts\common::get_string_right($view_file, 4);
    if (! \bs_tts\common::is_string_found($file_ext, '.')) {
      $file_ext = '.php';
    } else if ($file_ext !== '.php') {
      $this->use_template_engine = true;
      $this->template_type = str_replace('.', '', $file_ext);
    }
    
    if ($file_ext === '.php') {
        $file = $this->find_view_path($view_file, $render_path);
    } else {
        $file = $this->find_template_path($view_file, $render_path);
    }

    if ($file === false) {
      echo "No view file exists for: {$view_file}!";
      throw new \Exception("View File does not exist: " . $view_file);
    } else {
      $this->files[] = array('file'=>$file, 'path'=>$render_path, 'file_type'=>$file_ext);
    }
  }
  
  public function clear_template(): void {
    $this->template = false;
  }
  
  /**
   * Use Template with view
   * @param string $render_page
   * @return bool was found
   */
  public function set_template(string $render_page): bool {
    if (! empty($render_page)) {
      $render_page = str_replace('.php', '', $render_page);
      $templ = "{$this->project_dir}/templates/{$render_page}";
      if (\bs_tts\requires::safer_file_exists(\bs_tts\site_helper::get_root() . $templ. '.php') !== false) {
        $this->template = $templ;
//        echo $this->template;
        return true;
      }
    }
    $this->template = false;
    return false;
  }

  private function clear_ob(int $saved_ob_level): void {
      while (ob_get_level() > $saved_ob_level) {
        ob_end_flush();
      }
  }
  
  /**
   * Sets a variable in this view with the given name and value
   * 
   * @param mixed $name Name of the variable to set in the view, or an array of key/value pairs where each key is the variable and each value is the value to set.
   * @param mixed $value Value of the variable to set in the view.
   */
  public function set($name, $value = null): void {
    if (is_array($name)) {
      foreach ($name as $var_name => $value) {
        $this->vars[$var_name] = $value;
      }
    } else {
      $this->vars[$name] = $value;
    }
  }
  
  /**
   * Alias to fetch with Built-in echo
   * @param type $local
   * @param string $file
   */
  public function render($local, string $file = null) {
    echo $this->fetch($local, $file);
  }
  
  /**
   * Outputs view
   * @param type $local = $this
   * @param $file (optional view file)
   */
  public function fetch($local, string $file = null): string {
    $page_output = ob_get_clean(); // Get echos before View
    \main_tts\views::ob_start();
    $saved_ob_level = ob_get_level();
    $this->set_view($file);

    unset($file);

    if (!is_object($local)) {
      $local = $this; // FALL Back, please use fetch($this);
    }
    
    if ($this->use_template_engine) {
      $this->tempalte_engine = \main_tts\registry::get('di')->get_service('templates', [$this->template_type]);
      if ($this->white_space_control) {
        $this->tempalte_engine->whitespace_control();
      }
    }
    
    if (count($this->files) > 0) {
      foreach ($this->files as $view_file) {
        if ($view_file['file_type'] == '.php') {
          \bs_tts\requires::secure_include($view_file['file'], $view_file['path'], $local, $this->vars); // Include the file
        } else {
          $template_file = str_replace('.tpl', '', $view_file['file']);
          $this->tempalte_engine->parse_file($template_file);
          $assigns = $this->vars['template_assigns'] ?? [];
          $filters = $this->vars['template_filters'] ?? null;
          $registers = $this->vars['template_registers'] ?? [];
          $assigns['production'] =(\main_tts\configure::get('tts', 'live') === true) ? true : false;
          echo $this->tempalte_engine->render($assigns, $filters, $registers);
        }
      }
    }
    $this->clear_ob($saved_ob_level);
    $page_output .= ob_get_clean();
    
    try {
    if (\bs_tts\common::get_bool(\main_tts\configure::get('tts', 'check_HTML_tags')) === true) {
      $tags = \tts\tag_matches::check_tags($page_output);
      if (! empty($tags['output'])) {
        $page_output .= $tags['output'];
        $page_output .= '<script type="text/javascript">'.$tags['alert'].'</script>';
        foreach($this->files as $bad) {
          $page_output .= "<script type=\"text/javascript\">console.log'In view file:{$bad['file']}');\r\n</script>";
        }
      }
    }
    } catch (\tts\exceptions\Bool_Exception $e) {
      if (\main_tts\configure::get('tts', 'live') === false) {
        $page_output .= \tts\assets::alert('SET Config for tts: check_HTML_tags');
      }      
    }
    
    if ($this->template !== false && \bs_tts\requires::safer_file_exists(\bs_tts\site_helper::get_root() . $this->template . ".php") !== false) {
      \main_tts\views::ob_start();
      $saved_ob_level = ob_get_level();
      $local->page_output = $page_output;
      \bs_tts\requires::secure_include($this->template, 'project', $local, $this->vars);
      $this->clear_ob($saved_ob_level);
      $page_output = ob_get_clean();
    }

    // Reset Files to zero, as they were outputed....
    unset($this->files);
    $this->files = [];
    
    return $page_output;
  }
  
}