<?php

namespace App\Repositories;

use App\Models\StockEntry;
use App\Models\TaxRate;
use Illuminate\Database\Eloquent\Collection;

class StockEntryRepository
{
    /**
     * @param  array<string, mixed>  $data
     */
    public function create(array $data): StockEntry
    {
        $data['unit'] = ($data['entry_type'] ?? '') === 'ingredient' ? 'gram' : 'piece';
        $data = $this->resolvePrices($data);

        return StockEntry::query()->create($data);
    }

    /**
     * @param  array<string, mixed>  $data
     */
    public function update(StockEntry $stockEntry, array $data): StockEntry
    {
        if (array_key_exists('entry_type', $data)) {
            $data['unit'] = ($data['entry_type'] ?? '') === 'ingredient' ? 'gram' : 'piece';
        }

        $data = $this->resolvePrices($data);

        $stockEntry->update($data);

        return $stockEntry->fresh();
    }

    /**
     * Ergänzt Netto-/Brutto-Preis pro kg und den UST-Snapshot.
     * Es genügt, Netto oder Brutto anzugeben; der jeweils fehlende Wert wird
     * aus dem gewählten Steuersatz berechnet.
     *
     * @param  array<string, mixed>  $data
     * @return array<string, mixed>
     */
    protected function resolvePrices(array $data): array
    {
        if (($data['entry_type'] ?? '') !== 'ingredient') {
            $data['price_per_kg'] = null;
            $data['price_per_kg_gross'] = null;
            $data['tax_rate_id'] = null;
            $data['tax_rate_percent'] = null;

            return $data;
        }

        $percent = null;
        if (! empty($data['tax_rate_id'])) {
            $percent = TaxRate::query()->whereKey($data['tax_rate_id'])->value('percent');
        }
        $data['tax_rate_percent'] = $percent;

        $factor = 1 + ((float) ($percent ?? 0)) / 100;

        $net = isset($data['price_per_kg']) && $data['price_per_kg'] !== null && $data['price_per_kg'] !== ''
            ? (float) $data['price_per_kg']
            : null;
        $gross = isset($data['price_per_kg_gross']) && $data['price_per_kg_gross'] !== null && $data['price_per_kg_gross'] !== ''
            ? (float) $data['price_per_kg_gross']
            : null;

        if ($net !== null && $gross === null) {
            $gross = round($net * $factor, 4);
        } elseif ($gross !== null && $net === null) {
            $net = $factor > 0 ? round($gross / $factor, 4) : $gross;
        } elseif ($net !== null && $gross !== null) {
            $gross = round($net * $factor, 4);
        }

        $data['price_per_kg'] = $net;
        $data['price_per_kg_gross'] = $gross;
        $data['price_total'] = null;

        return $data;
    }

    /**
     * @param  array<string, mixed>  $data
     */
    public function receive(StockEntry $stockEntry, array $data): StockEntry
    {
        $data['status'] = 'received';
        $data['received_by'] = auth()->id();

        $stockEntry->update($data);

        return $stockEntry->fresh();
    }

    /**
     * @return Collection<int, StockEntry>
     */
    public function getByStatus(string $status): Collection
    {
        return StockEntry::query()
            ->where('status', $status)
            ->orderByDesc('ordered_at')
            ->get();
    }

    /**
     * @return Collection<int, StockEntry>
     */
    public function getForIngredient(int $ingredientId): Collection
    {
        return StockEntry::query()
            ->where('ingredient_id', $ingredientId)
            ->where('status', 'received')
            ->orderByDesc('received_at')
            ->get();
    }

    /**
     * Letzter Netto-kg-Preis je Lieferant für einen Rohstoff (neuester Einkauf zählt).
     *
     * @return array<int, float> [supplier_id => price_per_kg_net]
     */
    public function lastNetPricePerSupplier(int $ingredientId): array
    {
        $ranked = StockEntry::query()
            ->selectRaw('supplier_id, price_per_kg, ROW_NUMBER() OVER (PARTITION BY supplier_id ORDER BY ordered_at DESC, id DESC) as rn')
            ->where('entry_type', 'ingredient')
            // Audit N-2: nur tatsächliche Eingänge — offene, evtl. nie gelieferte
            // Bestellungen bestimmen den letzten Einkaufspreis nicht mehr.
            ->where('status', 'received')
            ->where('ingredient_id', $ingredientId)
            ->whereNotNull('supplier_id')
            ->whereNotNull('price_per_kg');

        // DB::query statt StockEntry::query: der SoftDeletes-Global-Scope würde
        // sonst "stock_entries.deleted_at" auf dem Sub-Select-Alias referenzieren.
        return \DB::query()
            ->fromSub($ranked, 'ranked')
            ->where('rn', 1)
            ->pluck('price_per_kg', 'supplier_id')
            ->map(fn ($price) => (float) $price)
            ->all();
    }

    /**
     * Liste: Pending zuerst (neuestes Bestelldatum), dann Received (neuester Eingang).
     * Eingegangene Einträge sind auf $receivedLimit gedeckelt (OPT-3); null = alle.
     *
     * @return Collection<int, StockEntry>
     */
    public function listForIndex(?int $receivedLimit = 500): Collection
    {
        $with = [
            'ingredient',
            'packagingItem',
            'supplier',
            'location',
            'quality',
        ];

        $pending = StockEntry::query()->with($with)
            ->where('status', 'pending')
            ->orderByDesc('ordered_at')
            ->orderByDesc('id')
            ->get();

        $received = StockEntry::query()->with($with)
            ->where('status', 'received')
            ->orderByDesc('received_at')
            ->orderByDesc('id')
            ->when($receivedLimit !== null, fn ($q) => $q->limit($receivedLimit))
            ->get();

        return $pending->concat($received)->values();
    }
}