<?php

declare(strict_types=1);

namespace App\Http\Requests\PublicApi;

use App\Support\ContentTypes;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Rule;

/**
 * What the frontend rendered.
 *
 * Addressed the way the frontend already thinks: it fetched
 * `/public/v1/projects/mi-web` to draw the page, so it knows the type and the
 * slug without having to parse its own URL back apart. That also means a
 * report can only ever name something this API serves.
 */
class ReportViewsRequest extends FormRequest
{
    public function authorize(): bool
    {
        return true;
    }

    /**
     * Accept one report the same as a batch of one.
     */
    protected function prepareForValidation(): void
    {
        if ($this->has('type') && ! $this->has('views')) {
            $this->merge(['views' => [$this->only(['type', 'slug', 'locale', 'count'])]]);
        }
    }

    /**
     * @return array<string, mixed>
     */
    public function rules(): array
    {
        return [
            'views' => ['required', 'array', 'min:1', 'max:'.$this->maxBatch()],

            'views.*.type' => ['required', 'string', Rule::in(ContentTypes::keys())],
            'views.*.slug' => ['required', 'string', 'max:200'],

            'views.*.locale' => [
                'sometimes', 'nullable', 'string',
                Rule::in(array_keys((array) config('locales.supported'))),
            ],

            /*
             * Optional, because the obvious client sends one report per page
             * view. Capped because the frontend is trusted to count its own
             * renders and not to invent an audience: a number nobody can
             * check is a number worth bounding.
             */
            'views.*.count' => ['sometimes', 'integer', 'min:1', 'max:1000'],
        ];
    }

    /**
     * @return array<int, array<string, mixed>>
     */
    public function views(): array
    {
        return array_values((array) $this->validated('views'));
    }

    public function maxBatch(): int
    {
        return max(1, (int) config('site.telemetry.max_batch', 50));
    }
}