<?php

namespace App\Lib\Helpers;

use Illuminate\Container\Container;
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Pagination\Paginator;
use Illuminate\Support\Collection;

class CollectionHelper
{
    /**
     * Paginate a collection.
     *
     * @param \Illuminate\Support\Collection $results
     * @param integer                        $pageSize
     * @return \Illuminate\Pagination\LengthAwarePaginator
     */
    public static function paginate(Collection $results, int $pageSize): \Illuminate\Pagination\LengthAwarePaginator
    {
        $page = Paginator::resolveCurrentPage('page');

        return self::paginateManually($results, $pageSize, $page);
    }

    /**
     * Paginate a collection.
     *
     * @param \Illuminate\Support\Collection $results
     * @param integer                        $pageSize
     * @param integer                        $page
     * @return \Illuminate\Pagination\LengthAwarePaginator
     */
    public static function paginateManually(
        Collection $results,
        int $pageSize,
        int $page = 1
    ): \Illuminate\Pagination\LengthAwarePaginator {
        $total = $results->count();

        return self::paginator($results->forPage($page, $pageSize), $total, $pageSize, $page, [
            'path'     => Paginator::resolveCurrentPath(),
            'pageName' => 'page',
        ]);
    }

    /**
     * Create a new length-aware paginator instance.
     *
     * @param  \Illuminate\Support\Collection $items
     * @param  integer                        $total
     * @param  integer                        $perPage
     * @param  integer                        $currentPage
     * @param  array                          $options
     * @return \Illuminate\Pagination\LengthAwarePaginator
     */
    protected static function paginator(
        Collection $items,
        int $total,
        int $perPage,
        int $currentPage,
        array $options
    ): \Illuminate\Pagination\LengthAwarePaginator {
        return Container::getInstance()->makeWith(LengthAwarePaginator::class, [
            'items'       => $items,
            'total'       => $total,
            'perPage'     => $perPage,
            'currentPage' => $currentPage,
            'options'     => $options
        ]);
    }

    /**
     * Get an array of views for each recipe models given.
     *
     * @param \Illuminate\Pagination\LengthAwarePaginator $models
     * @param string                                      $path
     * @param string                                      $key
     * @return array
     */
    public static function getViewsFromPaginateModels(
        LengthAwarePaginator $models,
        string $path,
        string $key
    ): array {
        return $models->through(function ($model) use ($path, $key) {
            return view($path, [$key => $model])->render();
        })->toArray();
    }

    /**
     * Get an array of views for each item in collection given.
     *
     * @param \Illuminate\Support\Collection $collection
     * @param string                         $path
     * @param string                         $key
     * @return array
     */
    public static function getViewsFromCollection(Collection $collection, string $path, string $key): array
    {
        return $collection->map(function ($item) use ($path, $key) {
            return view($path, [$key => $item])->render();
        })->toArray();
    }

    public static function mapSlidesToFields(array $fields): array
    {
        return collect($fields)
            ->filter(fn($field, $key) => str_starts_with($key, 'slider_image_'))
            ->filter(fn($field) => !empty($field['value']))
            ->sortKeys()
            ->map(fn($field) => [
                'image' => [
                    'path'  => $field['value'],
                    'title' => $field['title'] ?? '',
                    'alt'   => $field['alt'] ?? '',
                ],
            ])
            ->values()
            ->toArray();
    }

    /**
     * Transform and merge 2 arrays to get homogeneous  result
     *
     * @param  array $items      sections array
     * @param  array $categories categories array
     * @return array
     */
    public static function mapItemsToCards(array $items, array $categories): array
    {
        $categoriesById = collect($categories)->keyBy('id');
        $result         = [];

        foreach ($items as $item) {
            $category = $categoriesById->get($item['category_id']);
            if (!$category) {
                continue;
            }
            $categoryKey = $category['name'];
            $parsed      = self::parseContent($item['content']);

            $result[$categoryKey][] = [
                'category' => $item['title'],
                'icon'     => [
                    'path'        => $item['picture'],
                    'alt'         => $item['picture_alt'],
                    'description' => $item['picture_title'],
                ],
                'content'  => [
                    [
                        'title'    => $parsed['title'],
                        'points'   => $parsed['points'],
                        'asterisc' => $parsed['asterisc'],
                    ],
                ],
                'class'    => 'card-template-sm',
            ];
        }
        return $result;
    }


    private static function parseContent(string $html): array
    {
        $dom = new \DOMDocument();
        @$dom->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8'));

        // Extract h3
        $title = '';
        $h3    = $dom->getElementsByTagName('h3');
        if ($h3->length > 0) {
            $title = trim($h3->item(0)->textContent);
        }

        // Extract li
        $points  = [];
        $liNodes = $dom->getElementsByTagName('li');
        foreach ($liNodes as $li) {
            $points[] = trim($dom->saveHTML($li));
        }

        // Extract last <p> *
        $asteriscs = [];
        $pNodes       = $dom->getElementsByTagName('p');
        foreach ($pNodes as $p) {
            $text = trim($p->textContent);
            if (str_starts_with($text, '*')) {
                $asteriscs[] = trim($dom->saveHTML($p));
            }
        }
        // if nothing to extract
        if (empty($title) && empty($points)) {
            $body    = $dom->getElementsByTagName('body')->item(0);
            $rawText = trim($body ? $body->textContent : strip_tags($html));
            if (!empty($rawText)) {
                $points[] = $rawText;
            }
        }
        // If no h3 found, use first paragraph as title
        if (empty($title)) {
            $pNodes = $dom->getElementsByTagName('p');

            if ($pNodes->length > 0) {
                $title = trim($pNodes->item(0)->textContent);
            }
        }
        return [
            'title'    => $title,
            'points'   => $points,
           'asterisc' => $asteriscs,
        ];
    }
}