<?php

declare(strict_types=1);

namespace Evomedien\Vitec\Controller;

use Evomedien\Vitec\Service\OgImageGeneratorService;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use TYPO3\CMS\Backend\Attribute\AsController;
use TYPO3\CMS\Backend\Routing\UriBuilder;
use TYPO3\CMS\Backend\Template\ModuleTemplateFactory;
use TYPO3\CMS\Core\Http\JsonResponse;
use TYPO3\CMS\Core\Http\RedirectResponse;
use TYPO3\CMS\Core\Messaging\FlashMessage;
use TYPO3\CMS\Core\Messaging\FlashMessageService;
use TYPO3\CMS\Core\Page\PageRenderer;
use TYPO3\CMS\Core\Type\ContextualFeedbackSeverity;
use TYPO3\CMS\Core\Utility\GeneralUtility;

/**
 * Backend module controller for OG Image generation.
 */
#[AsController]
final class OgImageController
{
    public function __construct(
        private readonly ModuleTemplateFactory $moduleTemplateFactory,
        private readonly OgImageGeneratorService $ogImageGeneratorService,
        private readonly FlashMessageService $flashMessageService,
        private readonly PageRenderer $pageRenderer,
        private readonly UriBuilder $uriBuilder,
    ) {}

    /**
     * Renders the OG image builder form.
     */
    public function indexAction(ServerRequestInterface $request): ResponseInterface
    {
        $this->pageRenderer->addJsFile(
            'EXT:vitec/Resources/Public/Javascript/og-image-preview.js'
        );

        $moduleTemplate = $this->moduleTemplateFactory->create($request);

        $moduleTemplate->assignMultiple([
            'formData'        => $this->getDefaultFormData(),
            'savedImages'     => $this->ogImageGeneratorService->getSavedImages(),
            'presets'         => $this->getPresets(),
            'backgroundImages' => $this->ogImageGeneratorService->getBackgroundImages(),
        ]);

        return $moduleTemplate->renderResponse('OgImage/Index');
    }

    /**
     * Handles form submission and generates the OG image.
     */
    public function generateAction(ServerRequestInterface $request): ResponseInterface
    {
        $parsedBody = $request->getParsedBody();
        $formData   = $parsedBody['ogimage'] ?? [];

        [$success, $message, $filePath] = $this->ogImageGeneratorService->generate($formData);

        $severity = $success
            ? ContextualFeedbackSeverity::OK
            : ContextualFeedbackSeverity::ERROR;

        $flashMessage = GeneralUtility::makeInstance(
            FlashMessage::class,
            $message,
            $success ? 'OG Image created' : 'Generation failed',
            $severity,
            true
        );
        $this->flashMessageService
            ->getMessageQueueByIdentifier()
            ->addMessage($flashMessage);

        $moduleUrl = (string)$this->uriBuilder->buildUriFromRoute('web_vitecogimage');
        return new RedirectResponse($moduleUrl, 303);
    }

    /**
     * Returns a base64 PNG preview without saving to disk (AJAX).
     */
    public function previewAction(ServerRequestInterface $request): ResponseInterface
    {
        $parsedBody = $request->getParsedBody();
        $formData   = $parsedBody['ogimage'] ?? [];

        [$success, $message, $dataUri] = $this->ogImageGeneratorService->generatePreview($formData);

        return new JsonResponse([
            'success'  => $success,
            'message'  => $message,
            'dataUri'  => $dataUri,
        ]);
    }

    // ──────────────────────────────────────────────────────────────────
    // Helpers
    // ──────────────────────────────────────────────────────────────────

    private function getDefaultFormData(): array
    {
        return [
            'bg_type'           => 'color',
            'bg_color'          => '#1a1a2e',
            'bg_image'          => '',
            'overlay_opacity'   => 40,
            'title'             => 'Your Page Title',
            'title_color'       => '#ffffff',
            'title_size'        => 64,
            'subtitle'          => 'A short description of your page',
            'subtitle_color'    => '#cccccc',
            'subtitle_size'     => 32,
            'label_text'        => 'VITEC',
            'label_bg_color'    => '#e63946',
            'label_text_color'  => '#ffffff',
            'label_position'    => 'top-left',
            'logo_path'         => '',
            'output_format'     => 'jpg',
            'output_quality'    => 90,
        ];
    }

    private function getPresets(): array
    {
        return [
            'dark-blue' => [
                'label'    => 'Dark Blue',
                'bg_color' => '#1a1a2e',
                'title_color' => '#ffffff',
                'subtitle_color' => '#aaaacc',
            ],
            'light'     => [
                'label'    => 'Clean Light',
                'bg_color' => '#f8f9fa',
                'title_color' => '#212529',
                'subtitle_color' => '#6c757d',
            ],
            'brand-red' => [
                'label'    => 'VITEC Brand Red',
                'bg_color' => '#1f1f1f',
                'title_color' => '#ffffff',
                'subtitle_color' => '#e63946',
            ],
        ];
    }
}