<?php

namespace App\Http\Controllers;

use App\Models\GameBet;
use App\Models\OperatorSession;
use App\Models\User;
use App\Services\BetiXClient;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;

class BetiXWebhookController extends Controller
{
    public function sessionEnded(Request $request, BetiXClient $client): \Illuminate\Http\Response
    {
        $rawBody  = $request->getContent();
        $sig      = $request->header('X-Signature', '');
        $secret   = config('services.betix.webhook_secret', '');

        // If a webhook secret is configured, verify the signature
        if ($secret !== '' && !$client->verifyWebhook($rawBody, $sig)) {
            Log::warning('[BetiX] Webhook signature mismatch', ['ip' => $request->ip()]);
            return response('Unauthorized', 401);
        }

        $payload = json_decode($rawBody, true);
        if (!$payload || !isset($payload['session_token'])) {
            return response('Bad Request', 400);
        }

        $token       = $payload['session_token'];
        $playerId    = $payload['player_id']    ?? null;
        $endBalance  = isset($payload['end_balance'])   ? (float) $payload['end_balance']   : null;
        $startBalance = isset($payload['start_balance']) ? (float) $payload['start_balance'] : null;
        $game        = $payload['game']         ?? null;
        $rounds      = $payload['rounds']       ?? 0;

        $session = OperatorSession::where('session_token', $token)->first();

        if (!$session) {
            // Unknown session — could be a replay or a stale token, acknowledge anyway
            Log::info('[BetiX] Webhook for unknown session', ['token' => $token]);
            return response('OK', 200);
        }

        if ($session->status !== 'active') {
            // Already processed (idempotency)
            return response('OK', 200);
        }

        DB::transaction(function () use ($session, $playerId, $endBalance, $startBalance, $rounds, $game) {
            // Mark session as expired
            $session->update([
                'status'          => 'expired',
                'current_balance' => $endBalance ?? $session->current_balance,
            ]);

            if ($endBalance === null || $playerId === null) {
                return;
            }

            // Apply balance delta to user (safe even if other transactions happened mid-session)
            $user = User::lockForUpdate()->find((int) $playerId);
            if (!$user) {
                return;
            }

            $sessionStart = $startBalance ?? (float) $session->start_balance;
            $delta        = $endBalance - $sessionStart; // positive = player won, negative = player lost

            $newBalance = max(0, (float) $user->balance + $delta);
            $user->balance = $newBalance;
            $user->save();

            Log::info(sprintf(
                '[BetiX] Session ended | player=%s | game=%s | rounds=%d | delta=%+.4f BTX | new_balance=%.4f',
                $playerId, $game ?? '?', $rounds, $delta, $newBalance
            ));
        });

        return response('OK', 200);
    }

    /**
     * POST /api/betix/round
     *
     * Called by the BetiX game server after each completed round.
     * Updates the user's balance incrementally and logs to game_bets.
     *
     * Payload: { session_token, player_id, new_balance, currency, server_seed_hash, round }
     */
    public function roundUpdate(Request $request, BetiXClient $client): \Illuminate\Http\Response
    {
        $rawBody = $request->getContent();
        $sig     = $request->header('X-Signature', '');
        $secret  = config('services.betix.webhook_secret', '');

        if ($secret !== '' && !$client->verifyWebhook($rawBody, $sig)) {
            Log::warning('[BetiX] Round webhook signature mismatch', ['ip' => $request->ip()]);
            return response('Unauthorized', 401);
        }

        $payload = json_decode($rawBody, true);
        if (!$payload || !isset($payload['session_token'], $payload['player_id'], $payload['new_balance'])) {
            return response('Bad Request', 400);
        }

        $token          = $payload['session_token'];
        $playerId       = (int) $payload['player_id'];
        $newBalance     = (float) $payload['new_balance'];
        $seedHash       = $payload['server_seed_hash'] ?? null;
        $roundNumber    = $payload['round']            ?? null;
        $currency       = strtoupper($payload['currency'] ?? 'EUR');

        $session = OperatorSession::where('session_token', $token)->first();

        if (!$session || $session->status !== 'active') {
            // Unknown or already-ended session — acknowledge without processing
            return response('OK', 200);
        }

        DB::transaction(function () use ($session, $playerId, $newBalance, $seedHash, $roundNumber, $currency) {
            $oldSessionBalance = (float) $session->current_balance;
            $delta = $newBalance - $oldSessionBalance; // positive = win, negative = loss

            // Update session's running balance + optionally rotate the seed hash
            $sessionUpdate = ['current_balance' => $newBalance];
            if ($seedHash) {
                $sessionUpdate['server_seed_hash'] = $seedHash;
            }
            $session->update($sessionUpdate);

            // Apply balance change to user (row-locked for safety)
            $user = User::lockForUpdate()->find($playerId);
            if (!$user) {
                return;
            }

            $userBalanceBefore = (float) $user->balance;
            $userBalanceAfter  = max(0.0, $userBalanceBefore + $delta);
            $user->balance = $userBalanceAfter;
            $user->save();

            // Log the round to game_bets (wager = loss side, payout = win side)
            GameBet::create([
                'user_id'          => $playerId,
                'game_name'        => $session->game_slug,
                'wager_amount'     => $delta < 0 ? abs($delta) : 0,
                'payout_amount'    => $delta > 0 ? $delta       : 0,
                'payout_multiplier'=> 0,
                'currency'         => $currency,
                'session_token'    => $session->session_token,
                'round_number'     => $roundNumber,
                'server_seed_hash' => $seedHash,
            ]);

            Log::info(sprintf(
                '[BetiX] Round update | player=%d | game=%s | round=%s | delta=%+.4f | balance=%.4f→%.4f',
                $playerId,
                $session->game_slug,
                $roundNumber ?? '?',
                $delta,
                $userBalanceBefore,
                $userBalanceAfter
            ));
        });

        return response('OK', 200);
    }
}