<?php
namespace App\Http\Controllers;

use App\Models\LodgePhoto;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;
use Illuminate\Validation\ValidationException;

class LodgePhotoController extends Controller
{
    private function authorizeAdmin(Request $request): void
    {
        abort_unless(filled(config('lodge.admin_email')) && $request->user()?->email === config('lodge.admin_email'), 403);
    }

    public function store(Request $request)
    {
        $this->authorizeAdmin($request);
        $request->validate([
            'photos' => ['required','array','min:1','max:10'],
            'photos.*' => ['required','image','mimes:jpeg,png,webp','max:15360'],
        ]);
        if (!extension_loaded('gd') || !function_exists('imagewebp')) {
            throw ValidationException::withMessages(['photos' => 'PHP GD with WebP support is required. Install php8.5-gd.']);
        }
        foreach ($request->file('photos') as $file) {
            $raw = file_get_contents($file->getRealPath());
            $source = @imagecreatefromstring($raw);
            unset($raw);
            if (!$source) {
                throw ValidationException::withMessages(['photos' => 'One image could not be decoded.']);
            }
            $width = imagesx($source); $height = imagesy($source);
            if ($width < 1 || $height < 1 || $width * $height > 45000000) {
                imagedestroy($source);
                throw ValidationException::withMessages(['photos' => 'Image dimensions are not supported (maximum 45 megapixels).']);
            }
            $id = (string) Str::uuid();
            $gallery = "lodge/gallery/{$id}.webp";
            $thumbnail = "lodge/thumb/{$id}.webp";
            try {
                $this->saveWebp($source, $width, $height, 1600, 82, $gallery);
                $this->saveWebp($source, $width, $height, 480, 77, $thumbnail);
                LodgePhoto::create(['gallery_path'=>$gallery,'thumbnail_path'=>$thumbnail,'alt_text'=>'Cresta 31 lodge photograph']);
            } catch (\Throwable $e) {
                Storage::disk('public')->delete([$gallery,$thumbnail]);
                throw $e;
            } finally {
                imagedestroy($source);
            }
        }
        return back()->with('success', 'Photographs uploaded and optimised.');
    }

    private function saveWebp($source, int $width, int $height, int $maxWidth, int $quality, string $path): void
    {
        $scale = min(1, $maxWidth / $width);
        $w = max(1, (int) round($width * $scale));
        $h = max(1, (int) round($height * $scale));
        $target = imagecreatetruecolor($w, $h);
        imagefill($target, 0, 0, imagecolorallocate($target, 255, 255, 255));
        imagecopyresampled($target, $source, 0, 0, 0, 0, $w, $h, $width, $height);
        ob_start();
        try {
            if (!imagewebp($target, null, $quality)) {
                throw new \RuntimeException('WebP conversion failed.');
            }
            $bytes = ob_get_clean();
        } catch (\Throwable $e) {
            ob_end_clean();
            imagedestroy($target);
            throw $e;
        }
        imagedestroy($target);
        if (!Storage::disk('public')->put($path, $bytes)) {
            throw new \RuntimeException('Unable to save the optimised image.');
        }
    }

    public function destroy(Request $request, LodgePhoto $photo)
    {
        $this->authorizeAdmin($request);
        $paths = [$photo->gallery_path, $photo->thumbnail_path];
        $photo->delete();
        Storage::disk('public')->delete($paths);
        return back()->with('success', 'Photograph deleted.');
    }
}