<?php

declare(strict_types=1);

namespace App\Http\Requests\Api\V1;

use App\Enums\PageStatus;
use App\Models\Page;
use App\Rules\Translatable;
use App\Rules\UniqueTranslatedSlug;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Rule;
use Illuminate\Validation\Validator;

/**
 * Shared validation for creating and updating pages. On update every field is
 * optional (PATCH semantics) but keeps the same shape rules.
 */
class PageRequest extends FormRequest
{
    /**
     * Authorisation is handled by the controller's policy calls, which produce
     * clearer 403s than a boolean here would.
     */
    public function authorize(): bool
    {
        return true;
    }

    /**
     * @return array<string, mixed>
     */
    public function rules(): array
    {
        $page = $this->route('page');
        $creating = ! $page instanceof Page;
        $sometimes = $creating ? 'required' : 'sometimes';

        return [
            'title' => [$sometimes, new Translatable(requireDefaultLocale: $creating, max: 255)],
            'slug' => [
                $sometimes,
                new Translatable(requireDefaultLocale: $creating, max: 255),
                new UniqueTranslatedSlug(Page::class, $page?->id),
            ],
            'excerpt' => ['sometimes', 'nullable', new Translatable(max: 500)],
            'body' => ['sometimes', 'nullable', new Translatable],
            'meta_title' => ['sometimes', 'nullable', new Translatable(max: 60)],
            'meta_description' => ['sometimes', 'nullable', new Translatable(max: 160)],

            'category_id' => ['sometimes', 'nullable', 'integer', Rule::exists('categories', 'id')->whereNull('deleted_at')],
            'status' => ['sometimes', Rule::enum(PageStatus::class)],
            'featured_image' => ['sometimes', 'nullable', 'string', 'max:2048'],
            'featured_image_alt' => ['sometimes', 'nullable', new Translatable(max: 255)],
            'is_featured' => ['sometimes', 'boolean'],
            'published_at' => ['sometimes', 'nullable', 'date'],
            'unpublish_at' => ['sometimes', 'nullable', 'date', 'after:published_at'],
        ];
    }

    public function withValidator(Validator $validator): void
    {
        $validator->after(function (Validator $validator): void {
            // Publishing is a distinct permission from editing, so a caller
            // who may write content still cannot push it live on their own.
            $status = $this->input('status');

            if ($status === PageStatus::Published->value && $this->user()?->cannot('pages.publish')) {
                $validator->errors()->add('status', __('rules.pages.cannot_publish'));
            }
        });
    }
}