<?php

declare(strict_types=1);
namespace Belevo\EnelixEMS;

require_once __DIR__.'/NetzfahrplanV4Rueckmeldung.php';
require_once __DIR__.'/NetzfahrplanV4Geraeteabruf.php';

/** Shared confirmed physical reading used by receiver and battery before a trial command. */
trait BatterieNetzfahrplanV4RueckmeldungTrait
{
    private function registriereV4Rueckmeldung(): void
    {
        $this->RegisterPropertyString('NetzfahrplanV4RueckmeldungKonfiguration', '{}');
        $this->RegisterTimer('NetzfahrplanV4RueckmeldungAktualisieren', 0,
            "IPS_RequestAction(\$_IPS['TARGET'], 'NetzfahrplanV4RueckmeldungAktualisieren', 0);");
    }

    private function konfiguriereV4Rueckmeldung(): void
    {
        $this->SetBuffer('V4ConfirmedFeedback', '');
        $this->SetBuffer('V4ConfirmedFeedbackConfig', '');
        $this->SetBuffer('V4ConfirmedFeedbackMono', '');
        $configured = !in_array(trim($this->ReadPropertyString('NetzfahrplanV4RueckmeldungKonfiguration')), ['', '{}'], true);
        $this->SetTimerInterval('NetzfahrplanV4RueckmeldungAktualisieren', $configured ? 1000 : 0);
    }

    /** No transport I/O under the battery control lock. Original sample times never move. */
    private function v4BatterieRueckmeldung(): array
    {
        $json = $this->ReadPropertyString('NetzfahrplanV4RueckmeldungKonfiguration');
        $sample = json_decode($this->GetBuffer('V4ConfirmedFeedback'), true);
        $mono = (float) $this->GetBuffer('V4ConfirmedFeedbackMono');
        $now = time();$age = hrtime(true) / 1e9 - $mono;
        if (!is_array($sample) || !is_int($sample['checkedAt'] ?? null)
            || $sample['checkedAt'] > $now || $now - $sample['checkedAt'] > 2
            || $age < 0 || $age > 2
            || $this->GetBuffer('V4ConfirmedFeedbackConfig') !== hash('sha256', $json)) {
            throw new \RuntimeException('feedback_confirmed_cache_stale_or_invalid');
        }
        $config = json_decode($json, true, 32, JSON_THROW_ON_ERROR);
        if (($config['batteryInstanceId'] ?? null) !== $this->InstanceID
            || !in_array($config['managerId'] ?? 0, $this->zugeordneteManagerIDs(), true)) {
            throw new \RuntimeException('feedback_cache_binding_invalid');
        }
        foreach ($config['sources'] as $source) {
            if (!IPS_VariableExists($source['variableId'])) throw new \RuntimeException('feedback_variable_missing');
            $object = IPS_GetObject($source['variableId']);
            if ($object['ParentID'] !== $source['parentId'] || $object['ObjectIdent'] !== $source['ident']) {
                throw new \RuntimeException('feedback_cache_source_changed');
            }
        }
        return $sample;
    }

    /** Independent acquisition; never waits behind another read or takes the actuator lock. */
    private function aktualisiereV4Rueckmeldung(): void
    {
        $json=$this->ReadPropertyString('NetzfahrplanV4RueckmeldungKonfiguration');
        if (strlen($json)>65536) throw new \RuntimeException('feedback_configuration_too_large');
        $c=json_decode($json,true,32,JSON_THROW_ON_ERROR);
        if (!is_array($c) || ($c['batteryInstanceId']??null)!==$this->InstanceID) throw new \RuntimeException('feedback_battery_binding_invalid');
        if (!in_array($c['managerId']??0,$this->zugeordneteManagerIDs(),true)) throw new \RuntimeException('feedback_manager_binding_invalid');

        $lock='ENELIX.V4.Feedback.'.$this->InstanceID;
        if (!IPS_SemaphoreEnter($lock,0)) return;
        try {
            $reader=static function(int $id):array {
                if (!IPS_VariableExists($id)) throw new \RuntimeException('feedback_variable_missing');
                $v=IPS_GetVariable($id);$o=IPS_GetObject($id);$value=GetValue($id);
                return ['value'=>$value,'updated'=>$v['VariableUpdated'],'changed'=>$v['VariableChanged'],
                    'parentID'=>$o['ParentID'],'ident'=>$o['ObjectIdent']];
            };
            $result=null;
            for ($attempt=1;$attempt<=3;++$attempt) {
                try {
                    $result=NetzfahrplanV4Geraeteabruf::snapshot(
                        $c,
                        static function(int $id):string {
                            if (!IPS_InstanceExists($id)) throw new \RuntimeException('feedback_parent_instance_missing');
                            return (string)(IPS_GetInstance($id)['ModuleInfo']['ModuleID']??'');
                        },
                        static function(int $id,string $module):bool {
                            if ($module===NetzfahrplanV4Geraeteabruf::MBUS_DEVICE) {
                                if (!function_exists('MBUS_UpdateValues') && !function_exists(__NAMESPACE__.'\\MBUS_UpdateValues')) throw new \RuntimeException('feedback_mbus_refresh_unavailable');
                                return MBUS_UpdateValues($id)===true;
                            }
                            if (in_array($module,[NetzfahrplanV4Geraeteabruf::MODBUS_DEVICE,NetzfahrplanV4Geraeteabruf::MODBUS_ADDRESS],true)) {
                                if (!function_exists('ModBus_RequestRead') && !function_exists(__NAMESPACE__.'\\ModBus_RequestRead')) throw new \RuntimeException('feedback_modbus_refresh_unavailable');
                                return ModBus_RequestRead($id)===true;
                            }
                            return false;
                        },
                        $reader,
                        static fn():int=>time(),
                        static function(int $microseconds):void { usleep($microseconds); }
                    );
                    break;
                } catch (\InvalidArgumentException $e) {
                    if (!str_starts_with($e->getMessage(),'feedback_source_changed_after_confirmed_read:') || $attempt>=3) throw $e;
                    usleep(150000);
                }
            }
            if (!is_array($result)) throw new \RuntimeException('feedback_snapshot_unavailable');
            $this->SetBuffer('V4ConfirmedFeedback',json_encode($result,JSON_THROW_ON_ERROR));
            $this->SetBuffer('V4ConfirmedFeedbackConfig', hash('sha256', $json));
            $this->SetBuffer('V4ConfirmedFeedbackMono', (string) (hrtime(true) / 1e9));
        } catch (\Throwable $error) {
            $this->SetBuffer('V4ConfirmedFeedback', '');
            throw $error;
        } finally {
            IPS_SemaphoreLeave($lock);
        }
    }

    /** Read only. A returned current value is NOT actuator permission. */
    public function GetV4BatterieRueckmeldung(): string
    {
        try {
            try { $r=$this->v4BatterieRueckmeldung(); }
            catch (\Throwable) {
                $this->aktualisiereV4Rueckmeldung();
                $r=$this->v4BatterieRueckmeldung();
            }
        }
        catch (\Throwable $e) { $r=['kind'=>'local_physical_feedback','status'=>'unavailable','reason'=>substr($e->getMessage(),0,200),
            'batteryW'=>null,'gridW'=>null,'usableForTrial'=>false,'canDispatch'=>false,'deviceReadConfirmed'=>false]; }
        return json_encode($r,JSON_THROW_ON_ERROR);
    }
}