<?php

namespace Modules\Core\Logging\Privacy;

use Lunar\Models\Address;
use Lunar\Models\Cart;
use Lunar\Models\CartAddress;
use Lunar\Models\Customer;
use Lunar\Models\Order;
use Lunar\Models\OrderAddress;
use Lunar\Models\Transaction;
use Modules\Core\Privacy\Contracts\PersonalDataProvider;
use Modules\Core\Privacy\DTOs\CustomerSubject;
use Modules\Core\Privacy\Enums\ErasureOutcome;
use Modules\Core\Privacy\DTOs\ProviderErasureResult;
use Modules\Core\Privacy\DTOs\ProviderExportResult;
use Modules\Core\Privacy\DTOs\UserSubject;
use Spatie\Activitylog\Models\Activity;

/**
 * Spatie's own activity_log table (Modules\Core\Logging\ActivityLogService,
 * plus several Lunar models' native `use LogsActivity` — Customer,
 * CartAddress, OrderAddress, Transaction) durably retains a full snapshot
 * of whatever it logged in `properties` (created/updated/deleted
 * attributes, including a before/after diff on update), completely
 * independent of the real row it describes. Erasing/pseudonymizing
 * Customer/Address/CartAddress/OrderAddress/Transaction elsewhere (see
 * Customer\Privacy\CustomerDataProvider, Customer\Privacy\
 * AddressDataProvider, Cart\Privacy\CartDataProvider, Order\Privacy\
 * OrderDataProvider, Payment\Privacy\PaymentDataProvider) does nothing to
 * this table — a full copy of the old PII survives here regardless.
 *
 * Redacts by SUBJECT only, never by `causer_id` — the causer is "who did
 * this," not PII content, and erasing it would erode the audit trail's own
 * purpose (see this provider's own eraseForUser(), which is a deliberate
 * no-op). Genuinely Customer-scope only: every subject type here
 * (Customer, Address, CartAddress, OrderAddress, Transaction) resolves to
 * a business account via its own chain (Address/Customer directly;
 * CartAddress via cart_id -&gt; Cart.customer_id; OrderAddress/Transaction
 * via order_id -&gt; Order.customer_id) — none of it is a User's own data on
 * its own.
 *
 * MUST run before Customer\Privacy\AddressDataProvider in
 * config('core.privacy.providers') — that provider hard-deletes Address
 * rows, and once gone there is no way to re-derive which activity_log
 * rows (subject_type = Address) belonged to this customer. This provider
 * resolves that address id list itself, before anything deletes it.
 */
class ActivityLogDataProvider implements PersonalDataProvider
{
    private const REDACTED = '[redacted]';

    public function name(): string
    {
        return 'activity_log';
    }

    public function exportForCustomer(CustomerSubject $subject): ProviderExportResult
    {
        $activities = Activity::query()
            ->where(fn ($query) => $this->scopeToCustomer($query, $subject->customerId))
            ->get();

        return new ProviderExportResult('activity_log', $activities->map(fn (Activity $activity) => [
            'id' => $activity->id,
            'log_name' => $activity->log_name,
            'description' => $activity->description,
            'subject_type' => $activity->subject_type,
            'subject_id' => $activity->subject_id,
            'event' => $activity->event,
            'properties' => $activity->properties?->toArray(),
            'created_at' => $activity->created_at?->toIso8601String(),
        ])->all());
    }

    public function exportForUser(UserSubject $subject): ProviderExportResult
    {
        return new ProviderExportResult('activity_log', []);
    }

    public function eraseForCustomer(CustomerSubject $subject): ProviderErasureResult
    {
        $affected = Activity::query()
            ->where(fn ($query) => $this->scopeToCustomer($query, $subject->customerId))
            ->get();

        if ($affected->isEmpty()) {
            return new ProviderErasureResult('activity_log', ErasureOutcome::Skipped, 'No activity log entries for this customer.');
        }

        foreach ($affected as $activity) {
            $activity->update(['properties' => $this->redact($activity->properties?->toArray() ?? [])]);
        }

        return new ProviderErasureResult(
            'activity_log',
            ErasureOutcome::Pseudonymized,
            'PII-bearing properties redacted on matching audit log entries; who/what/when metadata (log_name, subject, event, timestamp, causer) retained for audit integrity.'
        );
    }

    public function eraseForUser(UserSubject $subject): ProviderErasureResult
    {
        return new ProviderErasureResult(
            'activity_log',
            ErasureOutcome::Skipped,
            'A User only ever appears here as causer_id (who performed an action), not as the PII content of a log entry — redacting that would erode the audit trail\'s own record of who acted.'
        );
    }

    private function scopeToCustomer($query, int $customerId): void
    {
        $customerMorph = (new Customer)->getMorphClass();
        $addressMorph = (new Address)->getMorphClass();
        $cartAddressMorph = (new CartAddress)->getMorphClass();
        $orderAddressMorph = (new OrderAddress)->getMorphClass();
        $transactionMorph = (new Transaction)->getMorphClass();

        $addressIds = Address::where('customer_id', $customerId)->pluck('id');
        $cartIds = Cart::where('customer_id', $customerId)->pluck('id');
        $cartAddressIds = CartAddress::whereIn('cart_id', $cartIds)->pluck('id');
        $orderIds = Order::where('customer_id', $customerId)->pluck('id');
        $orderAddressIds = OrderAddress::whereIn('order_id', $orderIds)->pluck('id');
        $transactionIds = Transaction::whereIn('order_id', $orderIds)->pluck('id');

        $query
            ->where(fn ($q) => $q->where('subject_type', $customerMorph)->where('subject_id', $customerId))
            ->orWhere(fn ($q) => $q->where('subject_type', $addressMorph)->whereIn('subject_id', $addressIds))
            ->orWhere(fn ($q) => $q->where('subject_type', $cartAddressMorph)->whereIn('subject_id', $cartAddressIds))
            ->orWhere(fn ($q) => $q->where('subject_type', $orderAddressMorph)->whereIn('subject_id', $orderAddressIds))
            ->orWhere(fn ($q) => $q->where('subject_type', $transactionMorph)->whereIn('subject_id', $transactionIds));
    }

    /**
     * @param  array<string, mixed>  $properties
     * @return array<string, mixed>
     */
    private function redact(array $properties): array
    {
        return array_map(function ($value) {
            if (is_array($value)) {
                return array_map(fn () => self::REDACTED, $value);
            }

            return self::REDACTED;
        }, $properties);
    }
}