<?php

namespace App\Services;

use App\Enums\TemplateKeyType;
use App\Models\TemplateGeneration;
use Illuminate\Support\Facades\Storage;
use PhpOffice\PhpPresentation\IOFactory;
use PhpOffice\PhpPresentation\PhpPresentation;
use PhpOffice\PhpPresentation\Shape\Drawing\File as FileDrawing;
use PhpOffice\PhpPresentation\Shape\Drawing\Gd as GdDrawing;
use PhpOffice\PhpPresentation\Shape\RichText;
use RuntimeException;

class TemplateFillService
{
    public function fill(TemplateGeneration $generation): string
    {
        $template = $generation->template;

        $sourcePath = Storage::disk('local')->path($template->file_path);
        $presentation = IOFactory::load($sourcePath);

        $values = $generation->values ?? [];

        foreach ($template->keys as $key) {
            if (! array_key_exists($key->key, $values)) {
                continue;
            }

            match ($key->type) {
                TemplateKeyType::Text => $this->fillText($presentation, $key->key, (string) $values[$key->key]),
                TemplateKeyType::Image => $this->fillImage($presentation, $key->shape_name, Storage::disk('local')->path($values[$key->key])),
                TemplateKeyType::Chart => throw new RuntimeException('پرکردن کلید از نوع چارت هنوز پشتیبانی نمی‌شود.'),
            };
        }

        $outputRelativePath = 'templates/generations/'.$generation->uuid.'.pptx';
        $outputAbsolutePath = Storage::disk('local')->path($outputRelativePath);

        Storage::disk('local')->makeDirectory('templates/generations');

        $writer = IOFactory::createWriter($presentation, 'PowerPoint2007');
        $writer->save($outputAbsolutePath);

        return $outputRelativePath;
    }

    private function fillText(PhpPresentation $presentation, string $key, string $value): void
    {
        $placeholder = '{{'.$key.'}}';

        foreach ($presentation->getAllSlides() as $slide) {
            foreach ($slide->getShapeCollection() as $shape) {
                if (! $shape instanceof RichText) {
                    continue;
                }

                foreach ($shape->getParagraphs() as $paragraph) {
                    foreach ($paragraph->getRichTextElements() as $element) {
                        if (str_contains($element->getText(), $placeholder)) {
                            $element->setText(str_replace($placeholder, $value, $element->getText()));
                        }
                    }
                }
            }
        }
    }

    private function fillImage(PhpPresentation $presentation, ?string $shapeName, string $imagePath): void
    {
        if ($shapeName === null || $shapeName === '') {
            return;
        }

        foreach ($presentation->getAllSlides() as $slide) {
            foreach ($slide->getShapeCollection() as $shape) {
                if ($shape->getName() !== $shapeName) {
                    continue;
                }

                if ($shape instanceof GdDrawing) {
                    $this->replaceGdImage($shape, $imagePath);
                } elseif ($shape instanceof FileDrawing) {
                    $shape->setPath($imagePath);
                }
            }
        }
    }

    private function replaceGdImage(GdDrawing $shape, string $imagePath): void
    {
        $info = getimagesize($imagePath);
        $image = imagecreatefromstring(file_get_contents($imagePath));

        if ($info === false || $image === false) {
            throw new RuntimeException('فایل تصویر ارسالی معتبر نیست.');
        }

        $shape->setImageResource($image);
        $shape->setMimeType($info['mime']);
        $shape->setRenderingFunction(str_replace('/', '', $info['mime']));
    }
}