<?php

declare(strict_types=1);

namespace App\Models;

use Illuminate\Database\Eloquent\Attributes\Fillable;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\MorphTo;
use Illuminate\Support\Facades\DB;

/**
 * One record, one language, one day, one number.
 *
 * Everything the panel can say about being read is a sum over these. There is
 * nothing else in the row on purpose: a table that also knew the address, the
 * hour and the browser would be a visitor log, and this exists to answer
 * editorial questions rather than to watch anybody.
 */
#[Fillable(['locale', 'day', 'count'])]
class ContentView extends Model
{
    protected function casts(): array
    {
        return [
            'day' => 'date',
            'count' => 'integer',
        ];
    }

    /**
     * @return MorphTo<Model, $this>
     */
    public function viewable(): MorphTo
    {
        return $this->morphTo();
    }

    /**
     * Add to today's tally for one record in one language.
     *
     * An upsert for the same reason the 404 counter uses one: these arrive in
     * bursts, and two of them racing on the same day would either violate the
     * unique index or lose a count.
     */
    public static function record(Model $viewable, string $locale, int $count = 1): void
    {
        $now = now();

        static::query()->upsert(
            [[
                'viewable_type' => $viewable->getMorphClass(),
                'viewable_id' => $viewable->getKey(),
                'locale' => $locale,
                'day' => $now->toDateString(),
                'count' => $count,
                'created_at' => $now,
                'updated_at' => $now,
            ]],
            ['viewable_type', 'viewable_id', 'locale', 'day'],
            [
                'count' => DB::raw("content_views.count + {$count}"),
                'updated_at' => $now,
            ],
        );
    }

    /**
     * @param  Builder<$this>  $query
     * @return Builder<$this>
     */
    public function scopeSince(Builder $query, int $days): Builder
    {
        return $query->where('day', '>=', now()->subDays($days)->toDateString());
    }
}