<?php

namespace App\Services;

use App\Models\Product;
use App\Models\ShippingCountry;
use App\Models\ShoppingUser;
use App\Models\UserAbo;
use App\Models\UserAboItem;
use App\User;
use Yard;

class AboOrderCart
{
    /**
     * Eigene Warenkorb-Instanz für den Abo-Detail-/Bearbeitungs-Flow.
     * Bewusst getrennt von der regulären Bestell-Instanz ('shopping') und der
     * Abo-Anlage-Instanz ('subscription'), damit sich die Warenkörbe über
     * mehrere Browser-Fenster/Tabs hinweg nicht vermischen.
     */
    public const INSTANCE = 'abo';

    private static $user_abo;

    private static $is_for;

    private static $customer_detail;

    /**
     * Gesamtgewicht (in Gramm) aller regulären Abo-Artikel und Einmal-Artikel des Abos.
     * Comp-Produkte zählen nicht (Gewicht 0).
     */
    public static function combinedWeight(UserAbo $user_abo): int
    {
        $weight = 0;
        foreach ($user_abo->user_abo_items as $item) {
            if ($item->comp) {
                continue;
            }
            if ($item->product) {
                $weight += (int) $item->product->weight * (int) $item->qty;
            }
        }
        foreach ($user_abo->one_time_items()->get() as $item) {
            $product = Product::find($item->product_id);
            if ($product) {
                $weight += (int) $product->weight * (int) $item->qty;
            }
        }

        return $weight;
    }

    /**
     * Prüft, ob das kombinierte Abo-Gewicht zzgl. eines Zusatzgewichts das Maximalgewicht
     * des Versandlandes überschreiten würde. Setzt einen über initYard() initialisierten Yard voraus.
     */
    public static function exceedsMaxWeight(UserAbo $user_abo, int $additionalWeight = 0): bool
    {
        $maxWeight = Yard::instance(self::INSTANCE)->getMaxWeight();
        if ($maxWeight <= 0) {
            return false;
        }

        return (self::combinedWeight($user_abo) + $additionalWeight) > $maxWeight;
    }

    public static function initYard($user_abo)
    {

        // WICHTIG: Statische Variablen zurücksetzen, um sicherzustellen, dass keine Daten
        // aus vorherigen Abos verwendet werden
        self::$user_abo = $user_abo;
        self::$is_for = null;
        self::$customer_detail = null;

        // Sicherstellen, dass UserService den Abo-Yard initialisiert (nicht 'shopping')
        UserService::setInstance(self::INSTANCE);

        // Yard komplett leeren - wichtig für Batch-Verarbeitung mehrerer Abos
        $yard = Yard::instance(self::INSTANCE);
        $itemsBeforeDestroy = $yard->content()->count();
        $yard->destroy();

        \Log::info('AboOrderCart::initYard: Yard geleert', [
            'abo_id' => $user_abo->id,
            'items_vor_destroy' => $itemsBeforeDestroy,
        ]);
        $itemsAfterDestroy = $yard->content()->count();
        \Log::info('AboOrderCart::initYard: Yard geleert', [
            'abo_id' => $user_abo->id,
            'items_after_destroy' => $itemsAfterDestroy,
        ]);

        self::$customer_detail = self::makeCustomerDetail($user_abo);
        if ($user_abo->is_for === 'me') {
            self::$is_for = 'abo-me';
            if ($user_abo->user && $user_abo->user->account->same_as_billing) {
                $country_id = $user_abo->user->account->country_id;
            } else {
                $country_id = $user_abo->user->account->shipping_country_id;
            }
            if ($country_id && $shipping_country = ShippingCountry::whereCountryId($country_id)->first()) {
                if ($shipping_country->shipping && $shipping_country->shipping->active) {
                    UserService::initUserYard($user_abo->user, $shipping_country->id, 'abo-me');

                    return true;
                }
            }
            abort(403, 'Fehler: Versandland nicht gefunden');
        }
        if ($user_abo->is_for === 'ot') {
            self::$is_for = 'abo-ot-customer';
            UserService::initCustomerYard(self::$customer_detail, 'abo-ot-customer');

            return true;
        }

        return false;
    }

    public static function makeOrderYard($user_abo)
    {
        // WICHTIG: Statische Variablen explizit setzen für dieses Abo
        self::$user_abo = $user_abo;
        if ($user_abo->is_for === 'ot') {
            self::$is_for = 'abo-ot-customer';
        }
        if ($user_abo->is_for === 'me') {
            self::$is_for = 'abo-me';
        }

        // WICHTIG: Yard IMMER leeren, um sicherzustellen, dass keine Produkte aus vorherigen Aufrufen vorhanden sind
        // Dies ist besonders wichtig bei wiederholten Aufrufen der detail-Funktion (z.B. durch AJAX-Requests)
        $yard = Yard::instance(self::INSTANCE);
        $itemsBefore = $yard->content()->count();
        $yard->destroy();

        if ($itemsBefore > 0) {
            \Log::warning('AboOrderCart::makeOrderYard: Yard war nicht leer vor makeOrderYard und wurde geleert', [
                'abo_id' => $user_abo->id,
                'items_before' => $itemsBefore,
            ]);
        }

        AboHelper::ensureUserAboItemsFromLatestOrder($user_abo);

        // Sicherstellen, dass die Items für dieses spezifische Abo geladen werden
        // Verwende fresh() um sicherzustellen, dass wir die aktuellen Daten haben
        $abo_items = $user_abo->user_abo_items()->get();
        \Log::info('AboOrderCart::makeOrderYard: Füge Produkte zum Cart hinzu', [
            'abo_id' => $user_abo->id,
            'item_count' => $abo_items->count(),
            'items' => $abo_items->map(function ($item) {
                return [
                    'id' => $item->id,
                    'product_id' => $item->product_id,
                    'qty' => $item->qty,
                    'comp' => $item->comp,
                ];
            })->toArray(),
        ]);

        foreach ($abo_items as $abo_item) {
            self::addProductToCart($abo_item);
        }
        Yard::instance(self::INSTANCE)->reCalculateShippingPrice();

        $user_abo->amount = Yard::instance(self::INSTANCE)->totalWithShipping(2, '.', '') * 100;
        $user_abo->save();
    }

    private static function addProductToCart($item)
    {

        $product = Product::find($item->product_id);
        $tax_free = Yard::instance(self::INSTANCE)->getUserTaxFree();
        $user_country = Yard::instance(self::INSTANCE)->getUserCountry();

        if ($product) {
            if ($item->comp) {
                $cartItem = Yard::instance(self::INSTANCE)->add(
                    $product->id,
                    $product->getLang('name'),
                    1,
                    0,
                    false,
                    false,
                    [
                        'image' => '',
                        'slug' => $product->slug,
                        'weight' => 0,
                        'points' => 0,
                        'comp' => $item->comp,
                        'product_id' => $product->id,
                    ]
                );
                Yard::setTax($cartItem->rowId, 0);

                return true;
            }
            if (self::$is_for === 'ot-customer' || self::$is_for === 'abo-ot-customer') {
                $cartItem = Yard::instance(self::INSTANCE)
                    ->add(
                        $product->id,
                        $product->getLang('name'),
                        $item->qty,
                        round($product->getPriceWith($tax_free, false, $user_country, false, self::$user_abo->user), 1),
                        false,
                        false,
                        ['image' => '', 'slug' => $product->slug, 'weight' => $product->weight, 'points' => $product->points, 'no_commission' => $product->no_commission, 'no_free_shipping' => $product->no_free_shipping, 'show_on' => $product->show_on]
                    );
            } else {
                $cartItem = Yard::instance(self::INSTANCE)
                    ->add(
                        $product->id,
                        $product->getLang('name'),
                        $item->qty,
                        $product->getPriceWith($tax_free, true, $user_country, false, self::$user_abo->user),
                        false,
                        false,
                        ['image' => '', 'slug' => $product->slug, 'weight' => $product->weight, 'points' => $product->points, 'no_commission' => $product->no_commission, 'no_free_shipping' => $product->no_free_shipping, 'show_on' => $product->show_on]
                    );
            }
            if ($tax_free) {
                Yard::setTax($cartItem->rowId, 0);
            } else {
                Yard::setTax($cartItem->rowId, $product->getTaxWith($user_country));
            }
        }
    }

    /**
     * Lädt die einmalig hinzugefügten Produkte (normales Bestellsortiment) zusätzlich
     * zu den Abo-Produkten in denselben Yard – mit dem eingefrorenen Snapshot-Preis und
     * der Cart-Option `abo_addon = true`. Anschließend wird der Versand über das
     * Gesamtgewicht neu berechnet.
     *
     * Wichtig: Diese Methode verändert NICHT `user_abos.amount` (reiner Abo-Betrag).
     * Sie muss nach {@see self::makeOrderYard()} aufgerufen werden.
     */
    public static function addOneTimeItemsToYard(UserAbo $user_abo): void
    {
        self::$user_abo = $user_abo;
        self::$is_for = $user_abo->is_for === 'me' ? 'abo-me' : 'abo-ot-customer';

        $yard = Yard::instance(self::INSTANCE);

        // Nur verbindlich bestätigte Einmal-Artikel fließen in die nächste Lieferung
        // (Snapshot-Menge == bestätigte Menge). Unbestätigte Entwürfe bleiben außen vor.
        $confirmedItems = $user_abo->one_time_items()
            ->whereNotNull('confirmed_at')
            ->whereColumn('confirmed_qty', 'qty')
            ->get();

        foreach ($confirmedItems as $item) {
            $product = Product::find($item->product_id);
            if (! $product) {
                continue;
            }

            $cartItem = $yard->add(
                $product->id,
                $product->getLang('name'),
                $item->qty,
                (float) $item->price,
                false,
                false,
                [
                    'image' => '',
                    'slug' => $product->slug,
                    'weight' => $product->weight,
                    'points' => $item->points,
                    'no_commission' => $product->no_commission,
                    'no_free_shipping' => $product->no_free_shipping,
                    'show_on' => $product->show_on,
                    'comp' => 0,
                    'abo_addon' => true,
                    'one_time_item_id' => $item->id,
                    'product_id' => $product->id,
                ]
            );
            Yard::setTax($cartItem->rowId, (float) $item->tax_rate);
        }

        $yard->reCalculateShippingPrice();
    }

    /**
     * Erstellt einen Preis-Snapshot für ein einmalig hinzugefügtes Produkt, konsistent
     * zur Cart-Preisberechnung in {@see self::addProductToCart()}.
     *
     * @return array{price: float, price_net: float, tax_rate: float, tax: float, price_vk_net: float, discount: float, points: int}
     */
    public static function buildOneTimeSnapshot(Product $product, UserAbo $user_abo): array
    {
        $yard = Yard::instance(self::INSTANCE);
        $tax_free = $yard->getUserTaxFree();
        $country = $yard->getUserCountry();
        $is_me = $user_abo->is_for === 'me';

        if ($is_me) {
            $price = (float) $product->getPriceWith($tax_free, true, $country, false, $user_abo->user);
        } else {
            $price = round((float) $product->getPriceWith($tax_free, false, $country, false, $user_abo->user), 1);
        }

        $tax_rate = $tax_free ? 0.0 : (float) $product->getTaxWith($country);
        $price_net = $tax_rate > 0 ? round($price / ((100 + $tax_rate) / 100), 3) : round($price, 3);
        $tax = round($price - $price_net, 3);
        $price_vk_net = round((float) $product->getPriceWith(true, false, $country), 3);

        $discount = 0.0;
        if ($is_me && ! $product->no_commission && $user_abo->user && $user_abo->user->user_level) {
            $discount = (float) $user_abo->user->user_level->getFormattedMargin();
        }

        return [
            'price' => round($price, 2),
            'price_net' => $price_net,
            'tax_rate' => $tax_rate,
            'tax' => $tax,
            'price_vk_net' => $price_vk_net,
            'discount' => $discount,
            'points' => (int) $product->points,
        ];
    }

    /**
     * Liefert getrennte Zwischensummen für Abo-Produkte und einmalig hinzugefügte
     * Artikel sowie die kombinierten Gesamtwerte (Versand nach Gesamtgewicht).
     *
     * @return array{
     *     abo: array{net: float, gross: float, tax: float},
     *     one_time: array{net: float, gross: float, tax: float},
     *     shipping_net: float,
     *     shipping_gross: float,
     *     total_with_shipping: float,
     *     has_one_time: bool
     * }
     */
    public static function getSplitSummary(): array
    {
        $yard = Yard::instance(self::INSTANCE);

        $abo = ['net' => 0.0, 'gross' => 0.0, 'tax' => 0.0];
        $oneTime = ['net' => 0.0, 'gross' => 0.0, 'tax' => 0.0];

        foreach ($yard->content() as $row) {
            $lineGross = (float) $row->price * $row->qty;
            $lineNet = $row->taxRate > 0 ? $lineGross / ((100 + $row->taxRate) / 100) : $lineGross;
            $lineTax = $lineGross - $lineNet;

            $bucket = ($row->options->abo_addon ?? false) ? 'oneTime' : 'abo';
            if ($bucket === 'oneTime') {
                $oneTime['net'] += $lineNet;
                $oneTime['gross'] += $lineGross;
                $oneTime['tax'] += $lineTax;
            } else {
                $abo['net'] += $lineNet;
                $abo['gross'] += $lineGross;
                $abo['tax'] += $lineTax;
            }
        }

        return [
            'abo' => [
                'net' => round($abo['net'], 2),
                'gross' => round($abo['gross'], 2),
                'tax' => round($abo['tax'], 2),
            ],
            'one_time' => [
                'net' => round($oneTime['net'], 2),
                'gross' => round($oneTime['gross'], 2),
                'tax' => round($oneTime['tax'], 2),
            ],
            'shipping_net' => (float) $yard->shippingNet(2, '.', ''),
            'shipping_gross' => (float) $yard->shipping(2, '.', ''),
            'total_with_shipping' => (float) $yard->totalWithShipping(2, '.', ''),
            'has_one_time' => $oneTime['gross'] > 0,
        ];
    }

    public static function checkNumOfCompProducts($user_abo)
    {

        if ($user_abo->is_for === 'me') {
            $needNumComp = Yard::instance(self::INSTANCE)->getNumComp();
            $UserAboItems = UserAboItem::where('user_abo_id', $user_abo->id)
                ->where('comp', '>', 0)
                ->orderBy('comp')
                ->get();

            if ($UserAboItems->count() < $needNumComp) {
                $product = Product::whereActive(true)
                    ->where('shipping_addon', true)
                    ->whereJsonContains('show_on', '12')
                    ->orderBy('pos', 'DESC')
                    ->first();

                if (! $product) {
                    return false;
                }

                for ($comp = $UserAboItems->count() + 1; $comp <= $needNumComp; $comp++) {
                    $UserAboItem = UserAboItem::create([
                        'user_abo_id' => $user_abo->id,
                        'product_id' => $product->id,
                        'comp' => $comp,
                        'qty' => 1,
                        'status' => 1,
                    ]);
                    AboItemHistoryService::logSystemCompAdded($user_abo, $UserAboItem);
                    self::addProductToCart($UserAboItem);
                }
            }

            if ($UserAboItems->count() > $needNumComp) {
                foreach ($UserAboItems as $UserAboItem) {
                    if ($UserAboItem->comp > $needNumComp) {
                        AboItemHistoryService::logSystemCompRemoved($user_abo, $UserAboItem);
                        $UserAboItem->delete();
                    }
                }

                foreach (Yard::instance(self::INSTANCE)->content() as $row) {
                    if (($row->options->comp ?? 0) > $needNumComp) {
                        Yard::instance(self::INSTANCE)->remove($row->rowId);
                    }
                }
            }
        }
    }

    public static function getCustomerDetail()
    {
        return self::$customer_detail;
    }

    /* Need this, can change the address */
    public static function makeCustomerDetail($user_abo)
    {

        if ($user_abo->is_for === 'me') {
            // only on Abo!
            $user = $user_abo->user;

            // WICHTIG: Wenn bereits ein shopping_user existiert, diesen replizieren um alle Felder zu behalten
            // Ansonsten neues Objekt erstellen
            if ($user_abo->shopping_user) {
                $shopping_user = $user_abo->shopping_user->replicate();
                \Log::info('AboOrderCart::makeCustomerDetail: ShoppingUser repliziert für Abo ID: '.$user_abo->id, [
                    'abo_id' => $user_abo->id,
                    'original_shopping_user_id' => $user_abo->shopping_user->id,
                ]);
            } else {
                $shopping_user = new ShoppingUser;
                \Log::info('AboOrderCart::makeCustomerDetail: Neuer ShoppingUser erstellt für Abo ID: '.$user_abo->id);
            }

            // Account-Daten überschreiben/aktualisieren
            $shopping_user->billing_salutation = $user->account->salutation;
            $shopping_user->billing_company = $user->account->company;
            $shopping_user->billing_firstname = $user->account->first_name;
            $shopping_user->billing_lastname = $user->account->last_name;
            $shopping_user->billing_address = $user->account->address;
            $shopping_user->billing_address_2 = $user->account->address_2;
            $shopping_user->billing_zipcode = $user->account->zipcode;
            $shopping_user->billing_city = $user->account->city;
            $shopping_user->billing_country_id = $user->account->country_id;
            $shopping_user->billing_phone = $user->account->phone;
            $shopping_user->billing_email = $user->email ?? null;
            $shopping_user->language = $user->account->getLocale();

            // Auth User ID setzen falls noch nicht gesetzt
            if (! $shopping_user->auth_user_id) {
                $shopping_user->auth_user_id = $user->id;
            }
            if ($user->account->same_as_billing) {
                $shopping_user->shipping_salutation = $user->account->salutation;
                $shopping_user->shipping_company = $user->account->company;
                $shopping_user->shipping_firstname = $user->account->first_name;
                $shopping_user->shipping_lastname = $user->account->last_name;
                $shopping_user->shipping_address = $user->account->address;
                $shopping_user->shipping_address_2 = $user->account->address_2;
                $shopping_user->shipping_zipcode = $user->account->zipcode;
                $shopping_user->shipping_city = $user->account->city;
                $shopping_user->shipping_country_id = $user->account->country_id;
                $shopping_user->shipping_phone = $user->account->phone;
                $shopping_user->shipping_postnumber = $user->account->shipping_postnumber;
                $shopping_user->same_as_billing = 1;
            } else {
                $shopping_user->shipping_salutation = $user->account->shipping_salutation;
                $shopping_user->shipping_company = $user->account->shipping_company;
                $shopping_user->shipping_firstname = $user->account->shipping_firstname;
                $shopping_user->shipping_lastname = $user->account->shipping_lastname;
                $shopping_user->shipping_address = $user->account->shipping_address;
                $shopping_user->shipping_address_2 = $user->account->shipping_address_2;
                $shopping_user->shipping_zipcode = $user->account->shipping_zipcode;
                $shopping_user->shipping_city = $user->account->shipping_city;
                $shopping_user->shipping_country_id = $user->account->shipping_country_id;
                $shopping_user->shipping_phone = $user->account->shipping_phone;
                $shopping_user->shipping_postnumber = $user->account->shipping_postnumber;
                $shopping_user->same_as_billing = 0;
            }
        }

        if ($user_abo->is_for === 'ot') {
            // look for the primary user of this abo
            $shopping_user = $user_abo->shopping_user->replicate();
        }

        return $shopping_user;
    }
}