<?php

declare(strict_types=1);

namespace Belevo\EnelixEMS\Tests;

use Belevo\EnelixEMS\NetzfahrplanV4Bezugszaehler as Meter;
use InvalidArgumentException;
use RuntimeException;

/** Offline only: injected readings, no Symcon, archive, network or actuator access. */
final class V4BezugszaehlerScenarios
{
    public static function run(): array
    {
        $now = 1790874000;
        $sources = [
            ['VariableID' => 59607, 'ElternID' => 11490, 'Ident' => 'Energy_0', 'FaktorZuKWh' => 1.0, 'Messgroesse' => 'WirkenergieBezug'],
            ['VariableID' => 26620, 'ElternID' => 11490, 'Ident' => 'Energy_1', 'FaktorZuKWh' => 1.0, 'Messgroesse' => 'WirkenergieBezug'],
        ];
        $samples = [
            59607 => ['value' => 3992.203, 'updated' => $now, 'parentID' => 11490, 'ident' => 'Energy_0'],
            26620 => ['value' => 0.0, 'updated' => $now, 'parentID' => 11490, 'ident' => 'Energy_1'],
        ];
        $check = static function (bool $value): void { if (!$value) { throw new RuntimeException('Assertion failed'); } };
        $reject = static function (callable $fn): void {
            try { $fn(); } catch (InvalidArgumentException $e) { return; }
            throw new RuntimeException('Expected invalid source/sample rejection');
        };
        $snapshot = static function ($ss = null, $mm = null) use ($sources, $samples, $now): array {
            $mm = $mm ?? $samples;
            return Meter::lesen($ss ?? $sources, static fn(int $id) => $mm[$id] ?? null, $now);
        };
        $cases = [];
        $cases['zero_t2_is_valid_but_not_history'] = static function () use ($snapshot, $check): void {
            $v = $snapshot();
            $check(abs($v['totalKwh'] - 3992.203) < 1e-9 && !$v['historyComplete'] && !$v['billingEvidence']);
            $check(!isset($v['measuredPeaks']) && !isset($v['quarterPast']));
        };
        $cases['both_tariffs_are_summed'] = static function () use ($snapshot, $samples, $check): void {
            $samples[26620]['value'] = 27.25;
            $check(abs($snapshot(null, $samples)['totalKwh'] - 4019.453) < 1e-9);
        };
        $cases['zero_total_not_replaced'] = static function () use ($snapshot, $samples, $check): void {
            $samples[59607]['value'] = 0;
            $check($snapshot(null, $samples)['totalKwh'] === 0.0);
        };
        $cases['source_order_does_not_change_identity'] = static function () use ($sources, $check): void {
            $check(Meter::identitaet($sources) === Meter::identitaet(array_reverse($sources)));
        };
        $cases['changed_factor_invalidates_identity'] = static function () use ($sources, $check): void {
            $old = Meter::identitaet($sources); $sources[0]['FaktorZuKWh'] = 0.001;
            $check($old !== Meter::identitaet($sources));
        };
        $cases['changed_variable_invalidates_identity'] = static function () use ($sources, $check): void {
            $old = Meter::identitaet($sources); $sources[0]['VariableID'] = 12345;
            $check($old !== Meter::identitaet($sources));
        };
        $cases['no_fallback_to_legacy_source'] = static function () use ($snapshot, $reject): void { $reject(static fn() => $snapshot([])); };
        $cases['duplicate_variable_rejected'] = static function () use ($sources, $snapshot, $reject): void {
            $sources[1] = $sources[0]; $reject(static fn() => $snapshot($sources));
        };
        $cases['different_meter_boundary_rejected'] = static function () use ($sources, $snapshot, $reject): void {
            $sources[1]['ElternID'] = 48065; $reject(static fn() => $snapshot($sources));
        };
        $cases['reactive_quantity_rejected'] = static function () use ($sources, $snapshot, $reject): void {
            $sources[0]['Messgroesse'] = 'Blindenergie'; $reject(static fn() => $snapshot($sources));
        };
        $cases['explicit_conversion_required'] = static function () use ($sources, $snapshot, $reject): void {
            unset($sources[0]['FaktorZuKWh']); $reject(static fn() => $snapshot($sources));
        };
        $cases['missing_tariff_not_zero'] = static function () use ($snapshot, $samples, $reject): void {
            unset($samples[26620]); $reject(static fn() => $snapshot(null, $samples));
        };
        $cases['stale_zero_tariff_rejected'] = static function () use ($snapshot, $samples, $reject): void {
            $samples[26620]['updated'] -= 61; $reject(static fn() => $snapshot(null, $samples));
        };
        $cases['future_reading_rejected'] = static function () use ($snapshot, $samples, $reject): void {
            $samples[26620]['updated']++; $reject(static fn() => $snapshot(null, $samples));
        };
        $cases['wrong_ident_rejected'] = static function () use ($snapshot, $samples, $reject): void {
            $samples[59607]['ident'] = 'Energy_6'; $reject(static fn() => $snapshot(null, $samples));
        };
        $cases['wrong_parent_rejected'] = static function () use ($snapshot, $samples, $reject): void {
            $samples[59607]['parentID'] = 48065; $reject(static fn() => $snapshot(null, $samples));
        };
        $cases['invalid_numbers_rejected'] = static function () use ($snapshot, $samples, $reject): void {
            foreach ([false, '3992.203', NAN, INF, -1.0] as $bad) {
                $samples[59607]['value'] = $bad; $reject(static fn() => $snapshot(null, $samples));
            }
        };
        $cases['skewed_tariff_observations_rejected'] = static function () use ($snapshot, $samples, $reject): void {
            $samples[59607]['updated'] -= 3; $reject(static fn() => $snapshot(null, $samples));
        };
        $cases['concurrent_update_in_same_second_rejected'] = static function () use ($sources, $samples, $now, $reject): void {
            $calls = 0;
            $read = static function (int $id) use ($samples, &$calls): array {
                $v = $samples[$id]; if (++$calls > 2) { $v['value'] += 0.1; } return $v;
            };
            $reject(static fn() => Meter::lesen($sources, $read, $now));
        };
        $cases['observation_not_fake_exact_billing_time'] = static function () use ($snapshot, $samples, $now, $check): void {
            $samples[59607]['updated'] -= 1;
            $v = $snapshot(null, $samples);
            $check($v['sourceObservationFrom'] === gmdate('c', $now - 1));
            $check($v['sourceObservationUntil'] === gmdate('c', $now) && $v['observedAt'] === gmdate('c', $now));
            $check(!$v['billingEvidence']);
        };
        $passed = [];
        foreach ($cases as $name => $fn) { $fn(); $passed[] = $name; }
        return $passed;
    }
}