<?php

namespace App\Livewire;

use App\Models\Room;
use App\Services\SystemHealth;
use Illuminate\Support\Collection;
use Livewire\Attributes\Layout;
use Livewire\Component;

#[Layout('layouts.app')]
class Dashboard extends Component
{
    private const LOW_BATTERY = 20;

    public function render()
    {
        $rooms = Room::query()
            ->with(['devices' => fn ($q) => $q->orderBy('name'), 'devices.entities.state'])
            ->orderBy('sort')->orderBy('name')
            ->get();

        $devices = $rooms->flatMap->devices;
        $entities = $devices->flatMap->entities;

        $summary = [
            'devices_online' => $devices->filter->isOnline()->count(),
            'devices_total' => $devices->count(),
            'lights_on' => $this->countWhere($entities, fn ($e) => in_array($e->type, ['light', 'switch']) && data_get($e->state, 'state.on') === true),
            'contacts_open' => $this->countWhere($entities, fn ($e) => $e->type === 'contact' && data_get($e->state, 'state.open') === true),
            'low_battery' => $this->countWhere($entities, fn ($e) => $e->type === 'battery' && (int) data_get($e->state, 'state.percent', 100) < self::LOW_BATTERY),
        ];

        return view('livewire.dashboard', [
            'rooms' => $rooms,
            'summary' => $summary,
            'warnings' => $this->warnings($devices, $entities),
        ]);
    }

    /** @return array<int, array{level:string,icon:string,title:string,meta:?string,link:?string}> */
    protected function warnings(Collection $devices, Collection $entities): array
    {
        $warnings = [];

        foreach ($devices->reject->isOnline() as $device) {
            $warnings[] = [
                'level' => 'offline', 'icon' => 'devices',
                'title' => $device->name, 'meta' => __('devices.offline'), 'link' => null,
            ];
        }

        foreach ($entities as $entity) {
            if ($entity->type === 'contact' && data_get($entity->state, 'state.open') === true) {
                $warnings[] = [
                    'level' => 'warning', 'icon' => 'window',
                    'title' => $entity->device->name, 'meta' => __('devices.open'), 'link' => null,
                ];
            }

            if ($entity->type === 'battery') {
                $percent = (int) data_get($entity->state, 'state.percent', 100);
                if ($percent < self::LOW_BATTERY) {
                    $warnings[] = [
                        'level' => 'warning', 'icon' => 'alert',
                        'title' => $entity->device->name,
                        'meta' => __('devices.battery').': '.$percent.'%', 'link' => null,
                    ];
                }
            }
        }

        if (! app(SystemHealth::class)->allOnline()) {
            $warnings[] = [
                'level' => 'warning', 'icon' => 'activity',
                'title' => __('dashboard.warn_host'), 'meta' => __('dashboard.warn_host_meta'),
                'link' => route('host'),
            ];
        }

        return $warnings;
    }

    protected function countWhere(Collection $entities, callable $fn): int
    {
        return $entities->filter($fn)->count();
    }
}