<?php

declare(strict_types=1);

namespace App\Filament\Resources\Users\RelationManagers;

use App\Models\UserSession;
use Filament\Actions\Action;
use Filament\Notifications\Notification;
use Filament\Resources\RelationManagers\RelationManager;
use Filament\Tables\Columns\TextColumn;
use Filament\Tables\Table;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Str;

/**
 * Every browser this account is signed in from, right now.
 *
 * Deactivating somebody (`is_active = false`) already cuts them off the
 * moment the guard next checks — but that check runs on their *next*
 * request, and until now there was nowhere to see whether one was still in
 * progress, let alone end it early. This is that place: read straight from
 * the `sessions` table Laravel's own database session driver already
 * maintains, nothing new written anywhere.
 */
class SessionsRelationManager extends RelationManager
{
    protected static string $relationship = 'sessions';

    public static function getTitle(Model $ownerRecord, string $pageClass): string
    {
        return __('panel.sessions.title');
    }

    public static function getBadge(Model $ownerRecord, string $pageClass): ?string
    {
        $count = $ownerRecord->sessions()->count();

        return $count > 0 ? (string) $count : null;
    }

    /**
     * Gated on the same permission that governs the rest of this screen,
     * rather than a permission of its own: whoever may already deactivate an
     * account is exactly who should be able to see, and end, where it is
     * currently signed in.
     */
    public static function canViewForRecord(Model $ownerRecord, string $pageClass): bool
    {
        return (bool) Auth::user()?->can('users.update');
    }

    public function table(Table $table): Table
    {
        return $table
            ->recordTitleAttribute('id')
            ->defaultSort('last_activity', 'desc')
            ->columns([
                TextColumn::make('ip_address')
                    ->label(__('panel.sessions.fields.ip_address'))
                    ->fontFamily('mono')
                    ->placeholder('—'),

                TextColumn::make('user_agent')
                    ->label(__('panel.sessions.fields.device'))
                    ->state(fn (UserSession $record) => self::describeUserAgent($record->user_agent))
                    ->description(fn (UserSession $record) => $record->isCurrent()
                        ? __('panel.sessions.this_one')
                        : null),

                TextColumn::make('last_activity')
                    ->label(__('panel.sessions.fields.last_activity'))
                    ->state(fn (UserSession $record) => $record->last_activity)
                    ->since()
                    ->dateTimeTooltip(),
            ])
            ->recordActions([
                Action::make('revoke')
                    ->label(__('panel.sessions.actions.revoke'))
                    ->icon('heroicon-o-x-circle')
                    ->color('danger')
                    ->requiresConfirmation()
                    // The one row this screen must never offer to end: doing
                    // so would sign out whoever is looking at it, mid-click.
                    ->visible(fn (UserSession $record) => ! $record->isCurrent())
                    ->action(function (UserSession $record): void {
                        $record->delete();

                        Notification::make()
                            ->title(__('panel.sessions.revoked'))
                            ->success()
                            ->send();
                    }),
            ])
            ->emptyStateHeading(__('panel.sessions.empty.heading'))
            ->emptyStateDescription(__('panel.sessions.empty.description'))
            ->emptyStateIcon('heroicon-o-computer-desktop');
    }

    /**
     * Browser and platform, guessed from the raw string every session row
     * already carries — not a parsing library, just enough of one to turn
     * "Mozilla/5.0 (Macintosh…) AppleWebKit… Safari/605.1" into something a
     * person recognises at a glance.
     */
    protected static function describeUserAgent(?string $userAgent): string
    {
        if (blank($userAgent)) {
            return __('panel.sessions.unknown_device');
        }

        $browser = match (true) {
            Str::contains($userAgent, 'Edg/') => 'Edge',
            Str::contains($userAgent, 'OPR/') => 'Opera',
            Str::contains($userAgent, 'Firefox/') => 'Firefox',
            Str::contains($userAgent, 'Chrome/') => 'Chrome',
            Str::contains($userAgent, 'Safari/') => 'Safari',
            default => null,
        };

        $platform = match (true) {
            Str::contains($userAgent, 'iPhone') || Str::contains($userAgent, 'iPad') => 'iOS',
            Str::contains($userAgent, 'Android') => 'Android',
            Str::contains($userAgent, 'Mac OS X') => 'macOS',
            Str::contains($userAgent, 'Windows') => 'Windows',
            Str::contains($userAgent, 'Linux') => 'Linux',
            default => null,
        };

        return match (true) {
            $browser && $platform => "{$browser} · {$platform}",
            $browser !== null => $browser,
            $platform !== null => $platform,
            default => __('panel.sessions.unknown_device'),
        };
    }
}