<?php

namespace Websmid\CustomHtml\Form\DataHandler;

use PrestaShop\PrestaShop\Core\Form\IdentifiableObject\DataHandler\FormDataHandlerInterface;
use Websmid\CustomHtml\Config\Config;
use Websmid\CustomHtml\Model\CustomHtmlBlock;
use Websmid\CustomHtml\Model\CustomHtmlFaq;
use Websmid\CustomHtml\Model\CustomHtmlSlide;
use Symfony\Component\HttpFoundation\File\UploadedFile;
use Db;
use Exception;
use Validate;

final class CustomHtmlBlockDataHandler implements FormDataHandlerInterface
{
    public function create(array $formData)
    {
        $idGroup = (int) $formData['id_ws_customhtml_group'];

        $block = new CustomHtmlBlock();
        $block->id_ws_customhtml_group = $idGroup;
        $block->title                  = $formData['title'];
        $block->type                   = (string) $formData['type'];
        $block->show_title             = (int) $formData['show_title'];
        $block->custom_class           = (string) ($formData['custom_class'] ?? '');
        $block->content                = $formData['content'];
        $block->description            = $formData['description'] ?? [];
        $block->extra_description      = $formData['extra_description'] ?? [];
        $block->link                   = $formData['link'] ?? [];
        $block->link_text              = $formData['link_text'] ?? [];
        $block->alert_type             = (string) ($formData['alert_type'] ?? 'info');
        $block->timeout                = (int) ($formData['timeout'] ?? 0);
        $block->slider_mode             = (string) ($formData['slider_mode'] ?? Config::SLIDER_DEFAULT_MODE);
        $block->slides_per_view_mobile  = (float) ($formData['slides_per_view_mobile'] ?? Config::SLIDER_DEFAULT_SLIDES_PER_VIEW_MOBILE);
        $block->slides_per_view_tablet  = (float) ($formData['slides_per_view_tablet'] ?? Config::SLIDER_DEFAULT_SLIDES_PER_VIEW_TABLET);
        $block->slides_per_view_desktop = (float) ($formData['slides_per_view_desktop'] ?? 0);
        $block->autoplay_delay          = (int) ($formData['autoplay_delay'] ?? 0);
        $block->image                  = $this->saveUploadedImage($formData['image'] ?? null, '');
        $block->active                 = (int) $formData['active'];
        $block->ordering               = $this->getNextOrdering($idGroup);

        if (!$block->add()) {
            return false;
        }

        $this->saveFaqs((int) $block->id, $formData['faqs'] ?? []);
        $this->saveSlides((int) $block->id, $formData['slides'] ?? []);

        return $block->id;
    }

    public function update($id, array $formData)
    {
        $block = new CustomHtmlBlock((int) $id);

        if (!Validate::isLoadedObject($block)) {
            return false;
        }

        $block->id_ws_customhtml_group = (int) $formData['id_ws_customhtml_group'];
        $block->title                  = $formData['title'];
        $block->type                   = (string) $formData['type'];
        $block->show_title             = (int) $formData['show_title'];
        $block->custom_class           = (string) ($formData['custom_class'] ?? '');
        $block->content                = $formData['content'];
        $block->description            = $formData['description'] ?? [];
        $block->extra_description      = $formData['extra_description'] ?? [];
        $block->link                   = $formData['link'] ?? [];
        $block->link_text              = $formData['link_text'] ?? [];
        $block->alert_type             = (string) ($formData['alert_type'] ?? 'info');
        $block->timeout                = (int) ($formData['timeout'] ?? 0);
        $block->slider_mode             = (string) ($formData['slider_mode'] ?? Config::SLIDER_DEFAULT_MODE);
        $block->slides_per_view_mobile  = (float) ($formData['slides_per_view_mobile'] ?? Config::SLIDER_DEFAULT_SLIDES_PER_VIEW_MOBILE);
        $block->slides_per_view_tablet  = (float) ($formData['slides_per_view_tablet'] ?? Config::SLIDER_DEFAULT_SLIDES_PER_VIEW_TABLET);
        $block->slides_per_view_desktop = (float) ($formData['slides_per_view_desktop'] ?? 0);
        $block->autoplay_delay          = (int) ($formData['autoplay_delay'] ?? 0);
        $block->image                  = $this->saveUploadedImage($formData['image'] ?? null, $block->image);
        $block->active                 = (int) $formData['active'];

        if (!$block->update()) {
            return false;
        }

        $this->saveFaqs((int) $id, $formData['faqs'] ?? []);
        $this->saveSlides((int) $id, $formData['slides'] ?? []);

        return true;
    }

    /**
     * Validates and stores an uploaded banner image, replacing the previous
     * one if any. Never trusts the client-supplied filename or MIME header —
     * the real MIME type is detected server-side and a random filename is
     * generated, so nothing from the upload itself ends up on disk.
     */
    private function saveUploadedImage(?UploadedFile $file, string $currentFilename): string
    {
        if (null === $file) {
            return $currentFilename;
        }

        if (!$file->isValid()) {
            throw new Exception('The uploaded image could not be read.');
        }

        if ($file->getSize() > Config::BANNER_IMAGE_MAX_SIZE) {
            throw new Exception('The uploaded image is too large (max 5 MB).');
        }

        $mimeType = $file->getMimeType();
        $extension = array_search($mimeType, Config::BANNER_IMAGE_ALLOWED_EXTENSIONS, true);

        if (false === $extension) {
            throw new Exception('The uploaded file is not a supported image type (jpg, png, gif, webp).');
        }

        $targetDir = CustomHtmlBlock::getBannerImageDir();

        if (!is_dir($targetDir) && !mkdir($targetDir, 0755, true) && !is_dir($targetDir)) {
            throw new Exception('Unable to create the banner image directory.');
        }

        $newFilename = bin2hex(random_bytes(16)) . '.' . $extension;
        $file->move($targetDir, $newFilename);

        if (!empty($currentFilename) && is_file($targetDir . $currentFilename)) {
            unlink($targetDir . $currentFilename);
        }

        return $newFilename;
    }

    private function getNextOrdering(int $idGroup): int
    {
        $maxOrdering = Db::getInstance()->getValue(
            'SELECT MAX(`ordering`) FROM `' . _DB_PREFIX_ . 'ws_customhtml`
             WHERE `id_ws_customhtml_group` = ' . (int) $idGroup
        );

        return $maxOrdering === false || $maxOrdering === null ? 0 : ((int) $maxOrdering + 1);
    }

    private function saveFaqs(int $idBlock, array $faqs): void
    {
        CustomHtmlFaq::deleteByBlockId($idBlock);

        foreach (array_values($faqs) as $position => $faqData) {
            $question = $faqData['question'] ?? [];

            if (empty(array_filter($question, static function ($value) {
                return trim((string) $value) !== '';
            }))) {
                continue;
            }

            $faq = new CustomHtmlFaq();
            $faq->id_ws_customhtml = $idBlock;
            $faq->question         = $question;
            $faq->answer           = $faqData['answer'] ?? [];
            $faq->ordering         = $position;
            $faq->add();
        }
    }

    /**
     * Slides are fully replaced on every save, like FAQ items — except a
     * slide's image can't round-trip through its file input, so the previous
     * filename is looked up by the slide's hidden id and reused whenever no
     * new file was uploaded for that row.
     */
    private function saveSlides(int $idBlock, array $slides): void
    {
        $existingImages = [];

        foreach (CustomHtmlSlide::getByBlockId($idBlock) as $existingSlide) {
            $existingImages[(int) $existingSlide['id_ws_customhtml_slide']] = $existingSlide['image'];
        }

        CustomHtmlSlide::deleteByBlockId($idBlock);

        foreach (array_values($slides) as $position => $slideData) {
            $existingId = (int) ($slideData['id'] ?? 0);
            $existingImage = $existingImages[$existingId] ?? '';

            $slide = new CustomHtmlSlide();
            $slide->id_ws_customhtml  = $idBlock;
            $slide->title             = $slideData['title'] ?? [];
            $slide->description       = $slideData['description'] ?? [];
            $slide->extra_description = $slideData['extra_description'] ?? [];
            $slide->link              = $slideData['link'] ?? [];
            $slide->link_text         = $slideData['link_text'] ?? [];
            $slide->image             = $this->saveUploadedImage($slideData['image'] ?? null, $existingImage);
            $slide->ordering          = $position;
            $slide->add();
        }
    }
}