<?php

namespace Modules\Core\Payment\Support;

use Lunar\Base\DataTransferObjects\PaymentCapture;
use Lunar\Base\DataTransferObjects\PaymentChecks;
use Lunar\Base\DataTransferObjects\PaymentRefund;
use Lunar\DataTypes\Price;
use Lunar\Models\Contracts\Transaction;
use Modules\Core\Payment\Contracts\SupportsCaptures;
use Modules\Core\Payment\Contracts\SupportsRefunds;
use Modules\Core\Payment\Enums\PaymentResultStatus;
use Modules\Core\Payment\Services\PaymentDriverRegistry;
use Modules\Core\Payment\Services\PaymentMethodCache;

/**
 * What Modules\Core\Payment\Models\CoreTransaction::driver() returns
 * instead of Lunar\Facades\Payments::driver($this->driver) — the point
 * where every Lunar-native caller of a transaction's driver (today: the
 * admin panel's "Refund"/"Capture" header actions on the order page,
 * ManageOrder::getRefundAction()/getCaptureAction() — see
 * $transaction->refund()/->capture() in vendor/lunarphp/core/src/Models/
 * Transaction.php) transparently lands on OUR real payment system instead
 * of Lunar's own, entirely separate, unused PaymentManager.
 *
 * Implements Lunar\Base\PaymentTypeInterface's refund()/capture()/
 * getPaymentChecks() signatures exactly — each takes the Transaction as
 * its own first argument (confirmed from vendor/lunarphp/core/src/Models/
 * Transaction.php: `$this->driver()->refund($this, $amount, $notes)`),
 * so this class holds no transaction state of its own; CoreTransaction's
 * driver() can return one shared instance for any transaction.
 *
 * $transaction->driver is a Modules\Core\Payment\Models\PaymentMethod.type
 * value (what Modules\Core\Order\Services\TransactionRecorder writes into
 * Transaction.driver) — this resolves the REAL registry key from that
 * type via PaymentMethodCache, then the real driver instance from
 * PaymentDriverRegistry, so refund()/capture() called here call the
 * ACTUAL Stripe/etc. driver, never a fake/no-op stand-in. If either
 * lookup fails (the PaymentMethod row or its driver no longer exists),
 * refund()/capture() report failure rather than silently doing nothing.
 */
class TransactionDriverAdapter
{
    public function __construct(
        private readonly PaymentMethodCache $paymentMethods,
        private readonly PaymentDriverRegistry $registry,
    ) {}

    public function refund(Transaction $transaction, int $amount, ?string $notes = null): PaymentRefund
    {
        return $this->refundVia($transaction, $this->driverKeyFor($transaction), $amount, $notes);
    }

    /**
     * The PaymentDriverRegistry key $transaction was originally taken
     * through — what refund()/capture() resolve against by default, and
     * what Order\Filament\Extensions\OrderActionsExtension defaults
     * its "Refund via" driver Select to, before an admin overrides it.
     */
    public function driverKeyFor(Transaction $transaction): ?string
    {
        return $this->paymentMethods->all()->firstWhere('type', $transaction->driver)?->driver;
    }

    /**
     * Same as refund(), but against an explicitly chosen driver rather than
     * the one $transaction was originally taken through — e.g. refunding a
     * cash-on-delivery order via a Bank Transfer driver instead of trying
     * (and failing) to refund through the offline driver that took the
     * original payment. $driverKey is a PaymentDriverRegistry key (e.g.
     * 'bank-transfer'), not a PaymentMethod.type — the two only coincide
     * when refunding through the transaction's own original driver.
     *
     * Called directly by Order\Filament\Extensions\
     * OrderActionsExtension when the admin picks a different driver
     * in the refund modal, bypassing Lunar\Models\Transaction::refund()
     * (whose fixed refund(int $amount, $notes = null) signature has no
     * room for a driver override) — see that extension's own docblock.
     */
    public function refundVia(Transaction $transaction, ?string $driverKey, int $amount, ?string $notes = null): PaymentRefund
    {
        $driver = $driverKey !== null ? $this->registry->resolve($driverKey) : null;

        if (! $driver instanceof SupportsRefunds) {
            return new PaymentRefund(success: false, message: 'This payment method does not support refunds.');
        }

        $result = $driver->refund(
            $transaction->reference,
            $this->priceFor($transaction, $amount),
            ['notes' => $notes, 'order_id' => $transaction->order_id],
        );

        return new PaymentRefund(
            success: $result->status === PaymentResultStatus::Succeeded,
            message: $result->failureReason,
        );
    }

    public function capture(Transaction $transaction, int $amount = 0): PaymentCapture
    {
        $driver = $this->resolveDriver($transaction);

        if (! $driver instanceof SupportsCaptures) {
            return new PaymentCapture(success: false, message: 'This payment method does not support a separate capture step.');
        }

        $result = $driver->capture(
            $transaction->reference,
            $this->priceFor($transaction, $amount ?: $transaction->amount->value),
            ['order_id' => $transaction->order_id],
        );

        return new PaymentCapture(
            success: $result->status === PaymentResultStatus::Succeeded,
            message: $result->failureReason ?? '',
        );
    }

    /**
     * Lunar's own PaymentChecks DTO (address/postcode/CVC verification
     * results) has no equivalent in our own contracts — none of our
     * drivers currently surface this level of gateway-specific detail.
     * Empty, not null: Lunar's admin panel iterates this collection to
     * render a checks list, so it needs to always be a valid (possibly
     * empty) PaymentChecks, never missing entirely.
     */
    public function getPaymentChecks(Transaction $transaction): PaymentChecks
    {
        return new PaymentChecks;
    }

    private function resolveDriver(Transaction $transaction): ?object
    {
        $driverKey = $this->driverKeyFor($transaction);

        return $driverKey !== null ? $this->registry->resolve($driverKey) : null;
    }

    private function priceFor(Transaction $transaction, int $amount): Price
    {
        return new Price($amount, $transaction->order->currency);
    }
}