<?php

namespace App\Services;

use App\Models\Device;
use Illuminate\Support\Collection;

/**
 * Aggregates the current home state (all devices/entities, incl. those with no room)
 * into a summary and a warning list. Shared by the Dashboard and the Warnings modal.
 */
class HomeStatus
{
    private const LOW_BATTERY = 20;

    public function __construct(private readonly SystemHealth $health) {}

    /** Every device (including room-less ones), eager-loaded for aggregation + display. */
    public function devices(): Collection
    {
        return Device::query()
            ->with(['entities.state', 'room'])
            ->orderBy('name')
            ->get();
    }

    public function summary(Collection $devices): array
    {
        $entities = $devices->flatMap->entities;

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

    /** @return array<int, array{level:string,icon:string,title:string,meta:?string,link:?string}> */
    public function warnings(Collection $devices): array
    {
        $entities = $devices->flatMap->entities;
        $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 (! $this->health->allOnline()) {
            $warnings[] = [
                'level' => 'warning', 'icon' => 'activity',
                'title' => __('dashboard.warn_host'), 'meta' => __('dashboard.warn_host_meta'),
                'link' => route('host'),
            ];
        }

        return $warnings;
    }
}