<?php

/**
 * Disco
 *
 * @package   Disco
 * @author    Ohidul Islam <wahid0003@gmail.com>
 * @link      http://domain.tld
 * @license   GPL 2.0+
 * @copyright 2022 WebAppick
 */

namespace Disco\Engine;

use Disco\Engine;
use function apply_filters;

/**
 * Disco Initializer
 */
class Initialize {

	/**
     * List of class to initialize.
     *
     * @var array
     */
    public $classes = array();

    /**
     * Instance of this Context.
     *
     * @var object
     */
    protected $content = null;

    /**
     * Composer autoload file list.
     *
     * @var \Composer\Autoload\ClassLoader
     */
    private $composer;

    /**
     * The Constructor that load the entry classes
     *
     * @param \Composer\Autoload\ClassLoader $composer Composer autoload output.
     * @since 1.0.0
     */
    public function __construct( \Composer\Autoload\ClassLoader $composer ) {
        $this->content  = new Engine\Context;
        $this->composer = $composer;

// $this->get_classes( 'Internals' );
// $this->get_classes( 'Integrations' );

        if ( $this->content->request( 'rest' ) ) {
            $this->get_classes( 'Rest' );
        }

// if ( $this->content->request( 'cli' ) ) {
// $this->get_classes( 'Cli' );
// }

	    if ( $this->content->request( 'ajax' ) ) {
		  	$this->get_classes( 'Ajax' );
	    }

        if ( $this->content->request( 'backend' ) ) {
            $this->get_classes( 'Backend' );
			$this->get_classes( 'Notice' );
        }

        if ( $this->content->request( 'frontend' ) ) {
            $this->get_classes( 'Frontend' );
        }

        $this->load_classes();
    }

    /**
     * Initialize all the classes.
     *
     * @return void
     * @throws \Exception If the class does not have the initialize method.
     * @since 1.0.0
     */
    private function load_classes() {
        $this->classes = apply_filters( 'disco_classes_to_execute', $this->classes );

        foreach ( $this->classes as $class ) {
            try {
                $this->initialize_plugin_class( $class );
            } catch ( \Throwable $err ) {
                \do_action( 'disco_initialize_failed', $err );

                if ( WP_DEBUG ) {
                    throw new \Exception( esc_html( $err->getMessage() ) );
                }
            }
        }
    }

    /**
     * Validate the class and initialize it.
     *
     * @param class-string $classtovalidate Class name to validate.
     * @return void
     * @since 1.0.0
     * @SuppressWarnings("MissingImport")
     */
    private function initialize_plugin_class( $classtovalidate ) {
        $reflection = new \ReflectionClass( $classtovalidate );

        if ( $reflection->isAbstract() ) {
            return;
        }

        $temp = new $classtovalidate;

        if ( ! \method_exists( $temp, 'initialize' ) ) {
            return;
        }

        $temp->initialize();
    }

    /**
     * Based on the folder loads the classes automatically using the Composer autoload to detect the classes of a
     * Namespace.
     *
     * @param string $namespacetofind Class name to find.
     * @return array Return the classes.
     * @since 1.0.0
     */
    private function get_classes( string $namespacetofind ) {
        $prefix          = $this->composer->getPrefixesPsr4();
        $classmap        = $this->composer->getClassMap();
        $namespacetofind = 'Disco\\' . $namespacetofind;

        // In case composer has autoload optimized
        if ( isset( $classmap['Disco\\Engine\\Initialize'] ) ) {
            $classes = \array_keys( $classmap );

            foreach ( $classes as $class ) {
                if ( 0 !== \strncmp( (string) $class, $namespacetofind, \strlen( $namespacetofind ) ) ) {
                    continue;
                }

                $this->classes[] = $class;
            }

            return $this->classes;
        }

        $namespacetofind .= '\\';

        // In case composer is not optimized
        if ( isset( $prefix[ $namespacetofind ] ) ) {
            $folder    = $prefix[ $namespacetofind ][0];
            $php_files = $this->scandir( $folder );
            $this->find_classes( $php_files, $folder, $namespacetofind );

            if ( ! WP_DEBUG ) {
                \wp_die( \esc_html__( 'Disco is on production environment with missing `composer dumpautoload -o` that will improve the performance on autoloading itself.', 'disco' ) );
            }

            return $this->classes;
        }

        return $this->classes;
    }

    /**
     * Get php files inside the folder/subfolder that will be loaded.
     * This class is used only when Composer is not optimized.
     *
     * @param string $folder      Path.
     * @param string $exclude_str Exclude all files whose filename contain this. Defaults to `~`.
     * @return array List of files.
     * @since 1.0.0
     */
    private function scandir( string $folder, string $exclude_str = '~' ) {
        // Also exclude these specific scandir findings.
        $blacklist = array(
			'..',
			'.',
			'index.php',
        );
        // Scan for files.
        $temp_files = \scandir( $folder );

        $files = array();

        if ( \is_array( $temp_files ) ) {
            foreach ( $temp_files as $temp_file ) {
                // Only include filenames that DO NOT contain the excluded string and ARE NOT on the scandir result blacklist.
                if ( \is_string( $exclude_str ) && false !== \mb_strpos( $temp_file, $exclude_str )
                    || $temp_file[0] === '.'
                    || \in_array( $temp_file, $blacklist, true )
                ) {
                    continue;
                }

                $files[] = $temp_file;
            }
        }

        return $files;
    }

    /**
     * Load namespace classes by files.
     *
     * @param array  $php_files List of files with the Class.
     * @param string $folder    Path of the folder.
     * @param string $base      Namespace base.
     * @return void
     * @since 1.0.0
     */
    private function find_classes( array $php_files, string $folder, string $base ) {
        foreach ( $php_files as $php_file ) {
            $class_name = \substr( $php_file, 0, -4 );
            $path       = $folder . '/' . $php_file;

            if ( \is_file( $path ) ) {
                $this->classes[] = $base . $class_name;

                continue;
            }

            // Verify the Namespace level
            if ( \substr_count( $base . $class_name, '\\' ) < 2 ) {
                continue;
            }

            if ( ! \is_dir( $path ) || \strtolower( $php_file ) === $php_file ) {
                continue;
            }

            $sub_php_files = $this->scandir( $folder . '/' . $php_file );
            $this->find_classes( $sub_php_files, $folder . '/' . $php_file, $base . $php_file . '\\' );
        }//end foreach
    }

}