<?php

if ( ! defined( 'ABSPATH' ) ) exit;

if ( ! function_exists( 'stacklar_require_file' ) ) {
    function stacklar_require_file( $relative_path ) {
        require_once STACKLAR_PATH . ltrim( $relative_path, '/' );
    }
}

if ( ! function_exists( 'stacklar_get_dependency_groups' ) ) {
    function stacklar_get_dependency_groups() {
        static $groups = null;
        if ( null !== $groups ) {
            return $groups;
        }

        $groups = apply_filters(
            'stacklar_dependency_groups',
            array(
                'core'    => array(
                    // Shared helpers first: the files below call them.
                    'includes/helpers.php',
                    'includes/plugin.php',
                    'includes/cpt.php',
                    'includes/block.php',
                    'includes/actions/action-base.php',
                    'includes/protection.php',
                ),
                'actions' => array(
                    'includes/actions/stacklar-action-send-mail.php',
                    'includes/actions/stacklar-action-form-config.php',
                ),
                'rest'    => array(
                    'includes/rest/register-action-handlers.php',
                    'includes/rest/stacklar-rest-actions.php',
                ),
                'admin'   => array(
                    'includes/admin/class-stacklar-duplicate.php',
                ),
            )
        );

        return is_array( $groups ) ? $groups : array();
    }
}

if ( ! function_exists( 'stacklar_is_cli_request' ) ) {
    function stacklar_is_cli_request() {
        return ( defined( 'WP_CLI' ) && WP_CLI ) || 'cli' === PHP_SAPI;
    }
}

if ( ! function_exists( 'stacklar_is_rest_request' ) ) {
    function stacklar_is_rest_request() {
        return defined( 'REST_REQUEST' ) && REST_REQUEST;
    }
}

if ( ! function_exists( 'stacklar_should_load_dependency_group' ) ) {
    function stacklar_should_load_dependency_group( $group ) {
        $group = sanitize_key( (string) $group );

        switch ( $group ) {
            case 'admin':
                $should_load = ( function_exists( 'is_admin' ) && is_admin() ) || stacklar_is_cli_request();
                break;
            case 'rest':
                $should_load = stacklar_is_rest_request() || stacklar_is_cli_request();
                break;
            default:
                $should_load = true;
                break;
        }

        return (bool) apply_filters( 'stacklar_should_load_dependency_group', $should_load, $group );
    }
}

if ( ! function_exists( 'stacklar_load_dependency_group' ) ) {
    function stacklar_load_dependency_group( $group ) {
        static $loaded = array();

        $group = sanitize_key( (string) $group );
        if ( '' === $group || ! empty( $loaded[ $group ] ) ) {
            return;
        }

        $groups = stacklar_get_dependency_groups();
        if ( empty( $groups[ $group ] ) || ! is_array( $groups[ $group ] ) ) {
            return;
        }

        $loaded[ $group ] = true;
        foreach ( $groups[ $group ] as $file ) {
            stacklar_require_file( $file );
        }
    }
}

if ( ! function_exists( 'stacklar_load_rest_dependencies' ) ) {
    function stacklar_load_rest_dependencies() {
        stacklar_load_dependency_group( 'rest' );
    }
}

if ( ! function_exists( 'stacklar_load_dependencies' ) ) {
    function stacklar_load_dependencies() {
        $groups = stacklar_get_dependency_groups();
        foreach ( array_keys( $groups ) as $group ) {
            if ( stacklar_should_load_dependency_group( $group ) ) {
                stacklar_load_dependency_group( $group );
            }
        }

        add_action( 'rest_api_init', 'stacklar_load_rest_dependencies', -100 );
    }
}