gruene-seele/app/Services/InventoryService.php

<?php

namespace App\Services;

use App\Models\Ingredient;
use App\Models\Production;
use App\Models\ProductionIngredient;
use App\Models\ProductionPackaging;
use App\Models\StockDisposal;
use App\Models\StockEntry;
use Carbon\Carbon;
use Illuminate\Database\Eloquent\Collection;

class InventoryService
{
    public function __construct(
        protected ProductionService $productionService,
    ) {}

    /**
     * Lookback-Fenster (Tage) für die Berechnung des durchschnittlichen Tagesverbrauchs
     * aus der Produktionshistorie.
     */
    public const CONSUMPTION_WINDOW_DAYS = 90;

    /**
     * Standard-Lieferzeit (Tage), falls weder am Rohstoff noch am Lieferanten ein Wert gepflegt ist.
     */
    public const DEFAULT_LEAD_DAYS = 14;

    /**
     * Gesamter Restbestand je Rohstoff in Gramm (nur eingegangene Chargen, abzüglich Produktionsverbrauch).
     *
     * @param  array<int, int>|null  $ingredientIds  Optionaler Filter; null = alle.
     * @return array<int, float> [ingredient_id => grams]
     */
    public function remainingByIngredient(?array $ingredientIds = null): array
    {
        $received = StockEntry::query()
            ->where('status', 'received')
            ->where('entry_type', 'ingredient')
            ->whereNotNull('ingredient_id')
            ->when($ingredientIds !== null, fn ($q) => $q->whereIn('ingredient_id', $ingredientIds))
            ->selectRaw('ingredient_id, SUM(received_quantity) as qty')
            ->groupBy('ingredient_id')
            ->pluck('qty', 'ingredient_id');

        $consumed = ProductionIngredient::query()
            ->join('productions', 'productions.id', '=', 'production_ingredients.production_id')
            ->whereNull('productions.deleted_at')
            // AP-43: Entwürfe (nicht gebucht) zählen nicht in den Bestand.
            ->where('productions.status', '!=', Production::STATUS_DRAFT)
            ->when($ingredientIds !== null, fn ($q) => $q->whereIn('production_ingredients.ingredient_id', $ingredientIds))
            ->selectRaw('production_ingredients.ingredient_id as ingredient_id, SUM(production_ingredients.quantity_used) as qty')
            ->groupBy('production_ingredients.ingredient_id')
            ->pluck('qty', 'ingredient_id');

        $disposed = $this->disposedByIngredient($ingredientIds);

        // Audit M-5: über die Vereinigung aller Keys iterieren — Rohstoffe mit
        // Verbrauch/Ausschuss, aber ohne Eingang, würden sonst fehlen und
        // negative Bestände als 0 maskiert.
        $ids = collect($received->keys())
            ->merge($consumed->keys())
            ->merge(array_keys($disposed))
            ->map(fn ($id) => (int) $id)
            ->unique();

        $result = [];
        foreach ($ids as $id) {
            $result[$id] = round((float) ($received[$id] ?? 0) - (float) ($consumed[$id] ?? 0) - (float) ($disposed[$id] ?? 0), 2);
        }

        return $result;
    }

    /**
     * Per Ausgang/Ausschuss entnommene Menge je Rohstoff in Gramm.
     *
     * @param  array<int, int>|null  $ingredientIds
     * @return array<int, float> [ingredient_id => grams]
     */
    public function disposedByIngredient(?array $ingredientIds = null): array
    {
        $rows = StockDisposal::query()
            ->where('disposal_type', 'ingredient')
            ->whereNotNull('ingredient_id')
            ->when($ingredientIds !== null, fn ($q) => $q->whereIn('ingredient_id', $ingredientIds))
            ->selectRaw('ingredient_id, SUM(quantity) as qty')
            ->groupBy('ingredient_id')
            ->pluck('qty', 'ingredient_id');

        $result = [];
        foreach ($rows as $id => $qty) {
            $result[(int) $id] = round((float) $qty, 2);
        }

        return $result;
    }

    /**
     * Restbestand eines Rohstoffs je Lagerort.
     *
     * @return array<int, float> [location_id => grams]
     */
    public function remainingByLocationForIngredient(int $ingredientId): array
    {
        $received = StockEntry::query()
            ->where('status', 'received')
            ->where('entry_type', 'ingredient')
            ->where('ingredient_id', $ingredientId)
            ->selectRaw('location_id, SUM(received_quantity) as qty')
            ->groupBy('location_id')
            ->pluck('qty', 'location_id');

        $consumed = ProductionIngredient::query()
            ->join('stock_entries', 'stock_entries.id', '=', 'production_ingredients.stock_entry_id')
            ->join('productions', 'productions.id', '=', 'production_ingredients.production_id')
            ->whereNull('productions.deleted_at')
            // AP-43: Entwürfe (nicht gebucht) zählen nicht in den Bestand.
            ->where('productions.status', '!=', Production::STATUS_DRAFT)
            ->where('production_ingredients.ingredient_id', $ingredientId)
            ->selectRaw('stock_entries.location_id as location_id, SUM(production_ingredients.quantity_used) as qty')
            ->groupBy('stock_entries.location_id')
            ->pluck('qty', 'location_id');

        // Audit M-5: chargen-bezogener Ausschuss zählt am Standort der Charge
        // (COALESCE), nicht am frei gewählten Disposal-Standort.
        $disposed = StockDisposal::query()
            ->leftJoin('stock_entries', 'stock_entries.id', '=', 'stock_disposals.stock_entry_id')
            ->where('stock_disposals.disposal_type', 'ingredient')
            ->where('stock_disposals.ingredient_id', $ingredientId)
            ->selectRaw('COALESCE(stock_entries.location_id, stock_disposals.location_id) as loc_id, SUM(stock_disposals.quantity) as qty')
            ->groupByRaw('COALESCE(stock_entries.location_id, stock_disposals.location_id)')
            ->pluck('qty', 'loc_id');

        $ids = collect($received->keys())
            ->merge($consumed->keys())
            ->merge($disposed->keys())
            ->map(fn ($id) => (int) $id)
            ->unique();

        $result = [];
        foreach ($ids as $locationId) {
            $result[$locationId] = round((float) ($received[$locationId] ?? 0) - (float) ($consumed[$locationId] ?? 0) - (float) ($disposed[$locationId] ?? 0), 2);
        }

        return $result;
    }

    /**
     * Restbestand je Verpackungsartikel in Stück (Wareneingang − Produktionsverbrauch − Ausschuss).
     *
     * @param  array<int, int>|null  $packagingItemIds
     * @return array<int, float> [packaging_item_id => pieces]
     */
    public function remainingByPackagingItem(?array $packagingItemIds = null): array
    {
        $received = StockEntry::query()
            ->where('status', 'received')
            ->whereIn('entry_type', ['packaging', 'shipping'])
            ->whereNotNull('packaging_item_id')
            ->when($packagingItemIds !== null, fn ($q) => $q->whereIn('packaging_item_id', $packagingItemIds))
            ->selectRaw('packaging_item_id, SUM(received_quantity) as qty')
            ->groupBy('packaging_item_id')
            ->pluck('qty', 'packaging_item_id');

        $consumed = ProductionPackaging::query()
            ->join('productions', 'productions.id', '=', 'production_packagings.production_id')
            ->whereNull('productions.deleted_at')
            // AP-43: Entwürfe (nicht gebucht) zählen nicht in den Bestand.
            ->where('productions.status', '!=', Production::STATUS_DRAFT)
            ->when($packagingItemIds !== null, fn ($q) => $q->whereIn('production_packagings.packaging_item_id', $packagingItemIds))
            ->selectRaw('production_packagings.packaging_item_id as packaging_item_id, SUM(production_packagings.quantity_used) as qty')
            ->groupBy('production_packagings.packaging_item_id')
            ->pluck('qty', 'packaging_item_id');

        $disposed = $this->disposedByPackagingItem($packagingItemIds);

        $ids = collect($received->keys())
            ->merge($consumed->keys())
            ->merge(array_keys($disposed))
            ->map(fn ($id) => (int) $id)
            ->unique();

        $result = [];
        foreach ($ids as $id) {
            $result[$id] = round((float) ($received[$id] ?? 0) - (float) ($consumed[$id] ?? 0) - (float) ($disposed[$id] ?? 0), 2);
        }

        return $result;
    }

    /**
     * Per Ausgang/Ausschuss entnommene Menge je Verpackungsartikel in Stück.
     *
     * @param  array<int, int>|null  $packagingItemIds
     * @return array<int, float> [packaging_item_id => pieces]
     */
    public function disposedByPackagingItem(?array $packagingItemIds = null): array
    {
        $rows = StockDisposal::query()
            ->where('disposal_type', 'packaging')
            ->whereNotNull('packaging_item_id')
            ->when($packagingItemIds !== null, fn ($q) => $q->whereIn('packaging_item_id', $packagingItemIds))
            ->selectRaw('packaging_item_id, SUM(quantity) as qty')
            ->groupBy('packaging_item_id')
            ->pluck('qty', 'packaging_item_id');

        $result = [];
        foreach ($rows as $id => $qty) {
            $result[(int) $id] = round((float) $qty, 2);
        }

        return $result;
    }

    /**
     * Offene (bestellte, noch nicht eingegangene) Menge je Rohstoff in Gramm.
     *
     * @param  array<int, int>|null  $ingredientIds
     * @return array<int, float> [ingredient_id => grams]
     */
    public function openOrderQuantityByIngredient(?array $ingredientIds = null): array
    {
        $rows = StockEntry::query()
            ->where('status', 'pending')
            ->where('entry_type', 'ingredient')
            ->whereNotNull('ingredient_id')
            ->when($ingredientIds !== null, fn ($q) => $q->whereIn('ingredient_id', $ingredientIds))
            ->selectRaw('ingredient_id, SUM(ordered_quantity) as qty')
            ->groupBy('ingredient_id')
            ->pluck('qty', 'ingredient_id');

        $result = [];
        foreach ($rows as $id => $qty) {
            $result[(int) $id] = round((float) $qty, 2);
        }

        return $result;
    }

    /**
     * Durchschnittlicher Tagesverbrauch je Rohstoff (Gramm/Tag) aus der Produktionshistorie.
     *
     * @param  array<int, int>|null  $ingredientIds
     * @return array<int, float> [ingredient_id => grams_per_day]
     */
    public function dailyConsumptionByIngredient(?array $ingredientIds = null, int $windowDays = self::CONSUMPTION_WINDOW_DAYS): array
    {
        // Audit N-3: exaktes Fenster — startOfDay() verlängerte den Zeitraum um
        // den angebrochenen heutigen Tag (Tagesverbrauch bis ~1 % überschätzt).
        $windowDays = max(1, $windowDays);
        $since = Carbon::now()->subDays($windowDays);

        $rows = ProductionIngredient::query()
            ->join('productions', 'productions.id', '=', 'production_ingredients.production_id')
            ->whereNull('productions.deleted_at')
            // AP-43: Entwürfe (nicht gebucht) zählen nicht in den Bestand.
            ->where('productions.status', '!=', Production::STATUS_DRAFT)
            ->where('productions.produced_at', '>=', $since)
            ->when($ingredientIds !== null, fn ($q) => $q->whereIn('production_ingredients.ingredient_id', $ingredientIds))
            ->selectRaw('production_ingredients.ingredient_id as ingredient_id, SUM(production_ingredients.quantity_used) as qty')
            ->groupBy('production_ingredients.ingredient_id')
            ->pluck('qty', 'ingredient_id');

        $result = [];
        foreach ($rows as $id => $qty) {
            $result[(int) $id] = round((float) $qty / $windowDays, 4);
        }

        return $result;
    }

    /**
     * Tage bis der Bestand bei gleichbleibendem Verbrauch aufgebraucht ist (null = kein Verbrauch).
     */
    public function daysUntilEmpty(float $remaining, ?float $dailyConsumption): ?int
    {
        if ($dailyConsumption === null || $dailyConsumption <= 0) {
            return null;
        }
        if ($remaining <= 0) {
            return 0;
        }

        return (int) floor($remaining / $dailyConsumption);
    }

    /**
     * Voraussichtliches Datum, an dem der Bestand auf null fällt (null = kein Verbrauch).
     */
    public function expectedEmptyDate(float $remaining, ?float $dailyConsumption): ?Carbon
    {
        $days = $this->daysUntilEmpty($remaining, $dailyConsumption);
        if ($days === null) {
            return null;
        }

        return Carbon::now()->startOfDay()->addDays($days);
    }

    /**
     * Bestands-Status eines Rohstoffs:
     *  - "critical": Meldebestand gepflegt und unterschritten (rot, Badge-relevant).
     *  - "critical_ordered": kritisch, aber es existiert bereits eine offene Bestellung (entschärft).
     *  - "warning": Bestand reicht voraussichtlich nicht mehr bis zur nächsten Lieferung.
     *  - "ok": ausreichend.
     */
    public function stockStatus(?float $minStockAlert, float $remaining, ?float $dailyConsumption, ?int $leadDays, bool $hasOpenOrder = false): string
    {
        if ($minStockAlert !== null && $minStockAlert > 0 && $remaining <= $minStockAlert) {
            return $hasOpenOrder ? 'critical_ordered' : 'critical';
        }

        $days = $this->daysUntilEmpty($remaining, $dailyConsumption);
        if ($days !== null) {
            $lead = $leadDays !== null && $leadDays > 0 ? $leadDays : self::DEFAULT_LEAD_DAYS;
            if ($days <= $lead) {
                return 'warning';
            }
        }

        return 'ok';
    }

    /**
     * Eingegangene Chargen eines Rohstoffs mit Restmenge (> 0), FEFO-sortiert
     * (frühestes MHD zuerst). Restmenge = Eingang − Produktionsverbrauch je Charge.
     *
     * @return Collection<int, StockEntry>
     */
    public function chargesWithRemainingForIngredient(int $ingredientId)
    {
        $entries = StockEntry::query()
            ->with(['supplier', 'location'])
            ->where('status', 'received')
            ->where('entry_type', 'ingredient')
            ->where('ingredient_id', $ingredientId)
            ->orderByRaw('best_before is null, best_before asc')
            ->orderBy('id')
            ->get();

        $consumed = $this->productionService->consumedByStockEntry($entries->pluck('id')->all());

        return $entries->map(function (StockEntry $entry) use ($consumed) {
            $received = $entry->received_quantity !== null ? (float) $entry->received_quantity : 0.0;
            $entry->setAttribute('remaining_quantity', round($received - ($consumed[(int) $entry->id] ?? 0.0), 2));

            return $entry;
        })->filter(fn (StockEntry $entry) => (float) $entry->getAttribute('remaining_quantity') > 0.0)
            ->values();
    }

    /**
     * AP-27: Verfügbare Chargen eines Rohstoffs je Chargennummer zusammengeführt.
     * Jeder Einkauf bleibt ein eigener stock_entry (in `entries` enthalten),
     * Restbestand/Anzeige werden je batch_number summiert. FEFO-Reihenfolge bleibt erhalten.
     *
     * @return \Illuminate\Support\Collection<int, array{key: string, batch_number: ?string, entries: Collection<int, StockEntry>, remaining: float, best_before: ?Carbon, suppliers: \Illuminate\Support\Collection<int, string>, locations: \Illuminate\Support\Collection<int, string>}>
     */
    public function chargeGroupsForIngredient(int $ingredientId): \Illuminate\Support\Collection
    {
        return $this->chargesWithRemainingForIngredient($ingredientId)
            ->groupBy(fn (StockEntry $entry) => $entry->batchGroupKey())
            ->map(function (Collection $entries, string $key) {
                /** @var StockEntry $first */
                $first = $entries->first();

                return [
                    'key' => $key,
                    'batch_number' => $first->batch_number,
                    'entries' => $entries->values(),
                    'remaining' => round($entries->sum(fn (StockEntry $e) => (float) $e->getAttribute('remaining_quantity')), 2),
                    'best_before' => $entries->pluck('best_before')->filter()->min(),
                    'suppliers' => $entries->map(fn (StockEntry $e) => $e->supplier?->name)->filter()->unique()->values(),
                    'locations' => $entries->map(fn (StockEntry $e) => $e->location?->name)->filter()->unique()->values(),
                ];
            })
            ->values();
    }

    /**
     * Offene (bestellte, noch nicht eingegangene) Einkäufe eines Rohstoffs.
     *
     * @return Collection<int, StockEntry>
     */
    public function openOrdersForIngredient(int $ingredientId)
    {
        return StockEntry::query()
            ->with(['supplier', 'location'])
            ->where('status', 'pending')
            ->where('entry_type', 'ingredient')
            ->where('ingredient_id', $ingredientId)
            ->orderBy('ordered_at')
            ->orderBy('id')
            ->get();
    }

    /**
     * Anzahl der kritischen (Meldebestand unterschritten) aktiven Rohstoffe – für das Sidenav-Badge.
     */
    public function criticalIngredientCount(): int
    {
        $ingredients = Ingredient::query()
            ->where('active', true)
            ->where('exclude_from_stock', false)
            ->whereNotNull('min_stock_alert')
            ->where('min_stock_alert', '>', 0)
            ->get(['id', 'min_stock_alert']);

        if ($ingredients->isEmpty()) {
            return 0;
        }

        $ids = $ingredients->pluck('id')->all();
        $remaining = $this->remainingByIngredient($ids);
        $openOrders = $this->openOrderQuantityByIngredient($ids);

        return $ingredients->filter(function (Ingredient $ingredient) use ($remaining, $openOrders) {
            $rem = $remaining[$ingredient->id] ?? 0.0;
            if ($rem > (float) $ingredient->min_stock_alert) {
                return false;
            }

            // Kritisch, aber bereits nachbestellt => entschärft, nicht im Badge zählen.
            return ($openOrders[$ingredient->id] ?? 0.0) <= 0;
        })->count();
    }
}