<?php

declare(strict_types=1);

namespace app\common\service;

use support\think\Db;
use Throwable;
use Webman\Push\Api;

final class GameLiveService
{
    private const BASE_ODDS = 33;
    private const CHANNEL = 'game-live';
    private const EVENT = 'bet-updated';

    public static function buildSnapshot(?int $recordId = null): array
    {
        $record = self::resolveRecord($recordId);
        if (!$record) {
            return [
                'record' => null,
                'bets' => [],
                'candidate_numbers' => [],
                'ai_default_number' => null,
                'server_time' => time(),
            ];
        }

        $bets = Db::name('bet_order')
            ->where('period_id', (int) $record['id'])
            ->order('id', 'desc')
            ->limit(200)
            ->select()
            ->toArray();

        $candidates = [];
        $bestNumber = null;
        $bestLoss = null;
        for ($n = 1; $n <= 36; $n++) {
            $loss = self::estimateLossForNumber($bets, $n);
            $candidates[] = [
                'number' => $n,
                'estimated_loss' => $loss,
            ];
            if ($bestLoss === null || bccomp((string) $loss, (string) $bestLoss, 4) < 0) {
                $bestLoss = $loss;
                $bestNumber = $n;
            }
        }

        return [
            'record' => $record,
            'bets' => array_map(static function (array $row): array {
                return [
                    'id' => (int) $row['id'],
                    'user_id' => (int) $row['user_id'],
                    'period_no' => (string) $row['period_no'],
                    'pick_numbers' => $row['pick_numbers'],
                    'unit_amount' => (string) $row['unit_amount'],
                    'total_amount' => (string) $row['total_amount'],
                    'streak_at_bet' => (int) $row['streak_at_bet'],
                    'create_time' => (int) $row['create_time'],
                ];
            }, $bets),
            'candidate_numbers' => $candidates,
            'ai_default_number' => $bestNumber,
            'server_time' => time(),
        ];
    }

    public static function publishSnapshot(?int $recordId = null): void
    {
        try {
            $payload = self::buildSnapshot($recordId);
            $api = new Api(
                str_replace('0.0.0.0', '127.0.0.1', (string) config('plugin.webman.push.app.api')),
                (string) config('plugin.webman.push.app.app_key'),
                (string) config('plugin.webman.push.app.app_secret')
            );
            $api->trigger(self::CHANNEL, self::EVENT, $payload);
        } catch (Throwable) {
        }
    }

    private static function resolveRecord(?int $recordId): ?array
    {
        if ($recordId !== null && $recordId > 0) {
            $row = Db::name('game_record')->where('id', $recordId)->find();
            if ($row) {
                return $row;
            }
        }
        return Db::name('game_record')->whereIn('status', [0, 1, 2, 3])->order('id', 'desc')->find();
    }

    private static function estimateLossForNumber(array $bets, int $number): string
    {
        $payout = '0.0000';
        foreach ($bets as $bet) {
            $pickNumbers = $bet['pick_numbers'];
            if (is_string($pickNumbers)) {
                $decoded = json_decode($pickNumbers, true);
                $pickNumbers = is_array($decoded) ? $decoded : [];
            }
            if (!is_array($pickNumbers)) {
                $pickNumbers = [];
            }
            if (!in_array($number, array_map('intval', $pickNumbers), true)) {
                continue;
            }
            $unit = (string) ($bet['unit_amount'] ?? '0');
            $streak = (int) ($bet['streak_at_bet'] ?? 0);
            $odds = (string) (($streak + 1) * self::BASE_ODDS);
            $orderPayout = bcmul($unit, $odds, 4);
            $payout = bcadd($payout, $orderPayout, 4);
        }
        return $payout;
    }
}