<?php

namespace App\Utilities;

class BusinessNavigation
{
    /**
     * Return the configured business navigation with this company's title overrides applied.
     */
    public static function all(): array
    {
        $navigation = config('business_navigation', []);
        $pageExtensions = (array) config('business_navigation_page_extensions', []);

        foreach ((array) ($pageExtensions['module_sections'] ?? []) as $definition) {
            $section = (array) ($definition['section'] ?? []);
            $sectionSlug = trim((string) ($section['slug'] ?? ''));
            if ($sectionSlug === ''
                || collect($navigation)->contains(
                    static fn (array $existing): bool => ($existing['slug'] ?? null) === $sectionSlug,
                )) {
                continue;
            }

            $positionAfter = trim((string) ($definition['position_after'] ?? ''));
            $anchorIndex = $positionAfter === ''
                ? false
                : collect($navigation)->search(
                    static fn (array $existing): bool => ($existing['slug'] ?? null) === $positionAfter,
                );
            array_splice(
                $navigation,
                is_int($anchorIndex) ? $anchorIndex + 1 : count($navigation),
                0,
                [$section],
            );
        }

        foreach ($navigation as &$section) {
            $sectionSlug = (string) ($section['slug'] ?? '');

            foreach ((array) ($pageExtensions[$sectionSlug] ?? []) as $extension) {
                $extensionSlug = trim((string) ($extension['slug'] ?? ''));

                if ($extensionSlug === '') {
                    continue;
                }

                $exists = collect($section['pages'] ?? [])->contains(
                    static fn (array $page): bool => (string) ($page['slug'] ?? '') === $extensionSlug
                );

                if (! $exists) {
                    $section['pages'][] = $extension;
                }
            }
        }
        unset($section);

        $titles = (array) setting('navigation.titles', []);
        $sectionTitles = (array) ($titles['sections'] ?? []);
        $pageTitles = (array) ($titles['pages'] ?? []);

        foreach ($navigation as &$section) {
            $sectionSlug = $section['slug'];
            $section['title'] = self::title($sectionTitles[$sectionSlug] ?? null, $section['title']);

            foreach ($section['pages'] ?? [] as $pageIndex => $page) {
                $section['pages'][$pageIndex]['title'] = self::title(
                    $pageTitles[$sectionSlug][$page['slug']] ?? null,
                    $page['title']
                );

                foreach ($page['children'] ?? [] as $childIndex => $child) {
                    $section['pages'][$pageIndex]['children'][$childIndex]['title'] = self::title(
                        $pageTitles[$sectionSlug][$child['slug']] ?? null,
                        $child['title']
                    );
                }
            }
        }
        unset($section);

        return $navigation;
    }

    private static function title($value, string $default): string
    {
        $value = trim((string) $value);

        return $value === '' ? $default : $value;
    }
}