<?php

declare(strict_types=1);

namespace App\Filament\Pages;

use App\Support\ViewStats;
use BackedEnum;
use Filament\Pages\Page as FilamentPage;
use Filament\Support\Icons\Heroicon;
use Illuminate\Contracts\Support\Htmlable;
use Illuminate\Support\Facades\Auth;
use Livewire\Attributes\Url;
use UnitEnum;

/**
 * What people read: the most read, how each language is doing, and what is
 * on the site that nobody opened. Counts only — what the frontend reports is
 * a daily total per record and language, with nothing about the person.
 */
class Statistics extends FilamentPage
{
    public const PERIODS = [7, 30, 90];

    protected string $view = 'filament.pages.statistics';

    protected static string|BackedEnum|null $navigationIcon = Heroicon::OutlinedChartBar;

    protected static ?int $navigationSort = 6;

    #[Url]
    public int $days = 30;

    public function mount(): void
    {
        if (! in_array($this->days, self::PERIODS, true)) {
            $this->days = 30;
        }
    }

    public function updatedDays(): void
    {
        $this->mount();
    }

    public static function canAccess(): bool
    {
        return Auth::user()?->can('panel.access') ?? false;
    }

    public static function getNavigationGroup(): string|UnitEnum|null
    {
        return __('panel.groups.content');
    }

    public static function getNavigationLabel(): string
    {
        return __('panel.statistics.title');
    }

    public function getTitle(): string|Htmlable
    {
        return __('panel.statistics.title');
    }

    public function stats(): ViewStats
    {
        return new ViewStats($this->days);
    }

    /**
     * "+52 %", "−10 %", or "new" when there was nothing to compare with.
     */
    public function change(int $now, int $before): string
    {
        if ($before === 0) {
            return $now > 0 ? __('panel.statistics.new') : '—';
        }

        $percent = (int) round(($now - $before) * 100 / $before);

        return ($percent > 0 ? '+' : ($percent < 0 ? '−' : '')).abs($percent).' %';
    }
}