<?php

declare(strict_types=1);

/**
 * @author Robert Strutts
 * @copyright (c) 2026, Robert Strutts
 * @license MIT
 */

namespace IOcornerstone\Framework;

use IOcornerstone\Framework\Enum\ViewType;
use IOcornerstone\Framework\{
    Common,
    Configure,
    Requires,
    Registry,
};

final class View
{

    public $white_space_control = false;
    public $page_output;
    private $vars = [];
    private $files = [];
    private $template = false;
    private $use_template_engine = false;
    private $use_template_engine_twig = false;
    private $use_template_engine_liquid = false;
    private $template_type = 'tpl';
    protected $tempalte_engine_twig = null;
    protected $tempalte_engine_liquid = null;

    private function getFile(string $view_file, string $default): string
    {
        $file = (empty($default)) ? "views/{$view_file}" : "views/{$default}/{$view_file}";
        $path = IO_CORNERSTONE_PROJECT;
        $vf = $path . $file;
        if (Requires::saferFileExists($vf) !== false) {
            return $file;
        }
        return '';
    }

    /**
     *  Alias to set_view 
     */
    public function include(string $file, ViewType $type = ViewType::PHP): void
    {
        $this->setView($file, $type);
    }

    /**
     *  Alias to set_view 
     */
    public function addView(string $file, ViewType $type = ViewType::PHP): void
    {
        $this->setView($file, $type);
    }

    /**
     * Check the $_GET['render'] for which folder to use to render the view
     * @param string $viewFile
     * @return file | false
     */
    private function findViewPath(string $viewFile): string|false
    {
        $found = false;

        $defaultPaths = Configure::get('view_mode', 'default_paths');
        $get = $_GET['render'];
        if (in_array($get, $defaultPaths)) {
            if (($key = array_search($get, $defaultPaths)) !== false) {
                unset($defaultPaths[$key]); // Remove as we'll make it first later...
            }
            array_unshift($defaultPaths, $get); // Make First in Array!
        }

        foreach ($defaultPaths as $default) {
            $file = $this->getFile($viewFile, $default);
            if (!empty($file)) {
                $found = true;
                break;
            }
        }
        return ($found) ? $file : false;
    }

    /**
     * Use View File
     * @param string $viewFile
     * @param string $render_path
     * @throws Exception
     */
    public function setView(?string $viewFile = null, ViewType $type = ViewType::PHP): void
    {
        if ($viewFile === null) {
            return;
        }

        $file_ext = ViewType::get_file_extension_for($type);
        $file = $this->findViewPath($viewFile . $file_ext);
        if ($type == ViewType::TWIG) {
            $this->use_template_engine_twig = true;
            $this->template_type = str_replace('.', '', $file_ext);
            $path = IO_CORNERSTONE_PROJECT;
            if ($file !== false) {
                $file = str_replace("views/twig", "", $file); // Remove Path, as it is defined in the service file
            }
        }
        if ($type == ViewType::LIQUID) {
            $this->use_template_engine_liquid = true;
            $this->template_type = str_replace('.', '', $file_ext);
            if ($file !== false) {
                $file = ltrim(str_replace("views/liquid", "", $file), "/"); // Remove Path, as it is defined in the service file
            }
        }

        if ($file === false) {
            echo "No view file exists for: {$viewFile}!";
            throw new \Exception("View File does not exist: " . $viewFile);
        } else {
            $this->files[] = array('file' => $file, 'path' => bootstrap\UseDir::PROJECT, 'file_type' => $file_ext);
        }
    }

    public function clearTemplate(): void
    {
        $this->template = false;
    }

    /**
     * Use PHP Template with view
     * @param string $render_page
     * @return bool was found
     */
    public function setPhpTemplate(string $render_page): bool
    {
        if (!empty($render_page)) {
            $render_page = str_replace('.php', '', $render_page);
            $templ = "/templates/{$render_page}";
            if (bootstrap\requires::safer_file_exists(IO_CORNERSTONE_PROJECT . $templ . '.php') !== false) {
                $this->template = $templ;
                return true;
            }
        }
        $this->template = false;
        return false;
    }

    private function clearOb(int $saved_ob_level): void
    {
        while (ob_get_level() > $saved_ob_level) {
            ob_end_flush();
        }
    }

    private function obStart(): void
    {
      if (extension_loaded('mbstring')) {
        ob_start('mb_output_handler');
      } else {
        ob_start();
      }
    }

    /**
     * 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, mixed $value = null): void
    {
        if (is_array($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, ViewType $type = ViewType::PHP)
    {
        echo $this->fetch($local, $file, $type);
    }

    /**
     * Outputs view
     * @param type $local = $this
     * @param $file (optional view file)
     */
    public function fetch($local, ?string $file = null, ViewType $type = ViewType::PHP): string
    {
        $page_output = ob_get_clean(); // Get echos before View
        $this->obStart();
        $saved_ob_level = ob_get_level();
        $this->setView($file, $type);

        unset($file);

        if (!is_object($local)) {
            $local = $this; // FALL Back, please use fetch($this);
        }

        if ($this->use_template_engine_liquid) {
            $this->tempalte_engine_liquid = Registry::get('di')->get_service('liquid', [$this->template_type]);
            if ($this->white_space_control) {
                $this->tempalte_engine->whitespace_control();
            }
        }

        if ($this->use_template_engine_twig) {
            $this->tempalte_engine_twig = Registry::get('di')->get_service('twig', [$this->template_type]);
        }

        if (count($this->files) > 0) {
            foreach ($this->files as $view_file) {
                if ($view_file['file_type'] == '.php') {
                    Requires::secureInclude($view_file['file'], UseDir::PROJECT, $local, $this->vars); // Include the PHP file
                } else if ($view_file['file_type'] == '.tpl') {
                    // Liquid uses .tpl by default, so remove that File Ext  
                    $template_file = str_replace('.tpl', '', $view_file['file']);
                    $this->tempalte_engine_liquid->parse_file($template_file);

                    $assigns = $this->vars['template_assigns'] ?? [];
                    $filters = $this->vars['template_filters'] ?? null;
                    $registers = $this->vars['template_registers'] ?? [];
                    $assigns['production'] = (isLive());
                    echo $this->tempalte_engine_liquid->render($assigns, $filters, $registers);
                } else if ($view_file['file_type'] == '.twig') {
                    $fns = $this->vars['twig_functions'] ?? [];
                    if (Common::getCount($fns)) {
                        foreach ($fns as $fn_label => $fn_name) {
                            $this->tempalte_engine_twig->addFunction(new \Twig\TwigFunction($fn_label, $fn_name));
                        }
                    }
                    $twig_data = $this->vars['twig_data'] ?? [];
                    echo $this->tempalte_engine_twig->render($view_file['file'], $twig_data);
                } else {
                    throw new \Exception("Unable View File Type");
                }
            }
        }
        $this->clear_ob($saved_ob_level);
        $page_output .= ob_get_clean();

        if (Configure::get('CodeHydrater', 'check_HTML_tags') === true) {
            $tags = TagMatches::checkTags($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>";
                }
            }
        }

        if ($this->template !== false && Requires::saferFileExists(IO_CORNERSTONE_PROJECT . $this->template . ".php") !== false) {
            $this->obStart();
            $saved_ob_level = ob_get_level();
            $local->page_output = $page_output;
            Requires::secureInclude($this->template, UseDir::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;
    }
}