<?php

namespace App\Observers;

use App\Models\Transaction;
use App\Services\CallCreditService;
use Illuminate\Support\Facades\Cache;

class TransactionObserver
{
    /**
     * After a transaction is created, bust balance caches and check credits.
     */
    public function created(Transaction $transaction): void
    {
        $this->bustBalanceCaches($transaction);

        $fromAccount = $transaction->accountFrom;
        if (!$fromAccount) {
            return;
        }

        $accountable = $fromAccount->accountable;
        if (!$accountable) {
            return;
        }

        $profileType = get_class($accountable);
        $profileId   = $accountable->id;

        if (!CallCreditService::profileHasCredits($profileType, $profileId)) {
            CallCreditService::pauseAllActiveCalls($profileType, $profileId);
        }
    }

    /**
     * Bust account_balance and accounts_info caches for both sides of the transaction.
     * This is the SINGLE SOURCE OF TRUTH for cache invalidation.
     */
    private function bustBalanceCaches(Transaction $transaction): void
    {
        $accounts = collect([
            $transaction->from_account_id ? $transaction->accountFrom : null,
            $transaction->to_account_id   ? $transaction->accountTo   : null,
        ])->filter();

        $clearedCaches = [];
        foreach ($accounts as $account) {
            // Bust per-account balance cache
            $balanceKey = "account_balance_{$account->id}";
            Cache::forget($balanceKey);
            $clearedCaches[] = $balanceKey;

            // Bust accounts_info cache for the owning profile
            $accountable = $account->accountable;
            if ($accountable) {
                $profileType = get_class($accountable);
                $profileId   = $accountable->id;
                $accountsInfoKey = "accounts_info_{$profileType}_{$profileId}";
                Cache::forget($accountsInfoKey);
                $clearedCaches[] = $accountsInfoKey;
            }
        }

        \Log::info('[TRANSACTION-OBSERVER] Caches cleared on transaction creation', [
            'transactionId' => $transaction->id,
            'clearedCaches' => $clearedCaches,
        ]);
    }
}