<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\HomeSlide;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\File;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;
use Illuminate\Validation\Rule;
use Illuminate\View\View;

class HomeSlideController extends Controller
{
    private const ZONES = ['left', 'right'];

    public function index(): View
    {
        $slides = HomeSlide::query()
            ->orderByRaw("CASE WHEN zone = 'left' THEN 0 ELSE 1 END")
            ->ordered()
            ->get()
            ->groupBy('zone');

        return view('admin.home-slides.index', [
            'slides' => $slides,
            'zoneLabels' => $this->zoneLabels(),
        ]);
    }

    public function create(Request $request): View
    {
        $zone = in_array($request->query('zone'), self::ZONES, true) ? $request->query('zone') : 'left';

        return view('admin.home-slides.create', [
            'slide' => new HomeSlide([
                'zone' => $zone,
                'show_title' => true,
                'show_subtitle' => true,
                'show_button' => true,
                'sort_order' => 100,
                'is_active' => true,
            ]),
            'zoneLabels' => $this->zoneLabels(),
        ]);
    }

    public function store(Request $request): RedirectResponse
    {
        $data = $this->validateSlide($request, true);
        $data['image_path'] = $this->storeImage($request);

        HomeSlide::create($data);

        return redirect()->route('admin.home-slides.index')->with('status', 'Слайд добавлен.');
    }

    public function edit(HomeSlide $homeSlide): View
    {
        return view('admin.home-slides.edit', [
            'slide' => $homeSlide,
            'zoneLabels' => $this->zoneLabels(),
        ]);
    }

    public function update(Request $request, HomeSlide $homeSlide): RedirectResponse
    {
        $data = $this->validateSlide($request);

        if ($request->hasFile('image')) {
            $newPath = $this->storeImage($request);
            $oldPath = $homeSlide->image_path;

            $data['image_path'] = $newPath;
            $homeSlide->update($data);

            if ($oldPath && $oldPath !== $newPath) {
                $this->deleteImage($oldPath);
            }

            return redirect()->route('admin.home-slides.index')->with('status', 'Слайд обновлен.');
        }

        $homeSlide->update($data);

        return redirect()->route('admin.home-slides.index')->with('status', 'Слайд обновлен.');
    }

    public function destroy(HomeSlide $homeSlide): RedirectResponse
    {
        $this->deleteImage($homeSlide->image_path);
        $homeSlide->delete();

        return redirect()->route('admin.home-slides.index')->with('status', 'Слайд удален.');
    }

    private function validateSlide(Request $request, bool $requireImage = false): array
    {
        return $request->validate([
            'zone' => ['required', Rule::in(self::ZONES)],
            'title' => ['nullable', 'string', 'max:160'],
            'show_title' => ['nullable', 'boolean'],
            'subtitle' => ['nullable', 'string', 'max:1500'],
            'show_subtitle' => ['nullable', 'boolean'],
            'button_text' => ['nullable', 'string', 'max:60'],
            'button_url' => ['nullable', 'string', 'max:255', 'regex:/^(\\/|https?:\\/\\/).+/i'],
            'show_button' => ['nullable', 'boolean'],
            'sort_order' => ['required', 'integer', 'min:0', 'max:9999'],
            'is_active' => ['nullable', 'boolean'],
            'image' => [
                $requireImage ? 'required' : 'nullable',
                'image',
                'mimes:jpg,jpeg,png,webp',
                'max:5120',
            ],
        ]) + [
            'show_title' => $request->boolean('show_title'),
            'show_subtitle' => $request->boolean('show_subtitle'),
            'show_button' => $request->boolean('show_button'),
            'is_active' => $request->boolean('is_active'),
        ];
    }

    private function storeImage(Request $request): string
    {
        $file = $request->file('image');
        if (!$file) {
            return '';
        }

        $extension = strtolower((string) $file->getClientOriginalExtension());
        if ($extension === '') {
            $extension = 'jpg';
        }

        $name = now()->format('YmdHis') . '-' . Str::uuid() . '.' . $extension;
        return (string) $file->storeAs('home-slides', $name, 'public');
    }

    private function deleteImage(?string $path): void
    {
        if (!$path) {
            return;
        }

        if (str_starts_with($path, 'uploads/')) {
            $filePath = public_path(ltrim($path, '/'));
            if (File::exists($filePath)) {
                File::delete($filePath);
            }

            return;
        }

        Storage::disk('public')->delete($path);
    }

    private function zoneLabels(): array
    {
        return [
            'left' => 'Большой слайдер (2/3)',
            'right' => 'Малый слайдер (1/3)',
        ];
    }
}