<?php

namespace App\Services;

use App\Constants\Util;
use App\Models\Config;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Storage;
use Symfony\Component\Process\Exception\ProcessTimedOutException;
use Symfony\Component\Process\Process;

class LotteryImageService
{
    /**
     * 生成开奖记录图片
     * @param array $records 开奖记录数组
     * @return string 图片的访问URL
     * @throws \Exception
     */
    public function generate(array $records): string
    {
        $html = $this->buildLocalizedHtml($records);
        $fileName = 'lottery_' . bin2hex(random_bytes(16)) . '.png';
        $outputPath = storage_path('app/public/lottery/' . $fileName);
        $htmlPath = null;
        $process = null;
        $completed = false;
        $timeout = max(1, (float) config('services.lottery_image.timeout', 20));
        $startedAt = microtime(true);

        try {
            if (!is_dir(dirname($outputPath)) && !mkdir(dirname($outputPath), 0755, true) && !is_dir(dirname($outputPath))) {
                throw new \RuntimeException('无法创建开奖图片目录');
            }

            $htmlPath = tempnam(storage_path('app'), 'lottery_');
            if ($htmlPath === false) {
                throw new \RuntimeException('无法创建开奖图片临时HTML');
            }
            $temporaryHtmlPath = $htmlPath . '.html';
            if (!rename($htmlPath, $temporaryHtmlPath)) {
                throw new \RuntimeException('无法创建开奖图片临时HTML文件');
            }
            $htmlPath = $temporaryHtmlPath;
            if (file_put_contents($htmlPath, $html) === false) {
                throw new \RuntimeException('无法保存开奖图片临时HTML');
            }

            $process = new Process([
                (string) config('services.lottery_image.binary', 'wkhtmltoimage'),
                '--quality',
                '100',
                $htmlPath,
                $outputPath,
            ]);
            $process->setTimeout($timeout);
            $process->run();

            if (!$process->isSuccessful() || !is_file($outputPath) || filesize($outputPath) === 0) {
                throw new \RuntimeException('渲染进程未生成有效图片');
            }

            $url = Util::replacePartInUrl(Storage::url('lottery/' . $fileName));
            Log::channel('issue')->info('开奖记录图片生成成功', $this->renderLogContext($process, $startedAt, $timeout));
            $completed = true;

            return $url;
        } catch (\Throwable $exception) {
            $timedOut = $exception instanceof ProcessTimedOutException;
            Log::channel('issue')->error('开奖记录图片生成失败', $this->renderLogContext($process, $startedAt, $timeout) + [
                'reason' => $timedOut ? 'timeout' : 'render_failed',
                'error_type' => get_class($exception),
            ]);

            $message = $timedOut
                ? '图片生成超时：渲染超过 ' . $timeout . ' 秒'
                : '图片生成失败，请检查 wkhtmltoimage、存储目录权限和开奖记录图片日志';
            throw new \RuntimeException($message, 0, $exception);
        } finally {
            if ($htmlPath && is_file($htmlPath)) {
                unlink($htmlPath);
            }
            if (!$completed && is_file($outputPath)) {
                unlink($outputPath);
            }
        }
    }

    protected function buildLocalizedHtml(array $records): string
    {
        $lang = App::getLocale();
        $group_language = Config::where('field', 'group_language')->first()->val;
        try {
            App::setLocale($group_language);
            return $this->buildHtml($records);
        } finally {
            App::setLocale($lang);
        }
    }

    private function renderLogContext(?Process $process, float $startedAt, float $timeout): array
    {
        $output = '';
        if ($process && $process->isStarted()) {
            $output = trim($process->getErrorOutput() . "\n" . $process->getOutput());
        }

        return [
            'duration_seconds' => round(microtime(true) - $startedAt, 3),
            'timeout_seconds' => $timeout,
            'exit_code' => $process ? $process->getExitCode() : null,
            'renderer_output' => substr($output, 0, 2000),
        ];
    }

    /**
     * 生成HTML内容
     */
    protected function buildHtml($records): string
    {
        $time = now()->format('Y-m-d H:i:s');

        $rows = '';
        foreach ($records as $row) {
            $rows .= '<tr>';
            $rows .= '<td>' . htmlspecialchars($row['issue_no']) . " " . lang("期") . '</td>';
            $rows .= '<td>';
            foreach ($row['winning_numbers'] as $i => $num) {
                $color = match ($i) {
                    0 => '#FF8A8A',
                    1 => '#8AB8FF',
                    2 => '#FFDF80',
                    default => '#000',
                };
                $rows .= "<span style='color: {$color};'>{$num}</span>";
                if ($i < count($row['winning_numbers']) - 1) $rows .= ' + ';
            }
            $rows .= ' = ' . array_sum($row['winning_numbers']) . '</td>';
            $rows .= '<td>' . $row['combo'] . '</td>';
            $rows .= '<td>' . $row['extreme'] . '</td>';
            $rows .= '<td>' . $row['tail'] . '</td>';
            $rows .= '</tr>';
        }
        $Canada28LotteryResults = lang("加拿大28开奖记录");
        $recentLotteryResults = lang("最近开奖记录");
        $th1 = lang("回合");
        $th2 = lang("结果");
        $th3 = lang("组合");
        $th4 = lang("极值");
        $th5 = lang("尾数");
        $createdTime = lang("生成时间");
        $dataForReferenceOnly = lang("数据仅供参考");

        return <<<HTML
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>{$Canada28LotteryResults}</title>
<style>
body {
    font-family: "Microsoft YaHei", Arial, sans-serif;
    /* background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); */
    /* background:  #667eea 0%; */
    margin: 0;
    padding: 5px;
    min-height: 100vh;
}
.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    overflow: hidden;
}
.header {
    /* background: linear-gradient(45deg, #e74c3c, #c0392b); */
    background:  #e74c3c;
    color: white;
    padding: 20px;
    text-align: center;
}
.header h1 {
    margin: 0;
    font-size: 28px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}
.results-table {
    width: 100%;
    border-collapse: collapse;
}
.results-table th {
    background: #34495e;
    color: white;
    padding: 15px 10px;
    text-align: center;
}
.results-table td {
    padding: 12px 10px;
    text-align: center;
    border-bottom: 1px solid #e0e0e0;
    font-weight: 900;
}
.footer {
    background: #ecf0f1;
    padding: 15px;
    text-align: center;
    color: #7f8c8d;
    font-size: 12px;
}
</style>
</head>
<body>
<div class="container">
    <div class="header">
        <h1>{$Canada28LotteryResults}</h1>
        <div class="subtitle">{$recentLotteryResults}</div>
    </div>
    <table class="results-table">
        <thead>
            <tr>
                <th>{$th1}</th>
                <th>{$th2}</th>
                <th>{$th3}</th>
                <th>{$th4}</th>
                <th>{$th5}</th>
            </tr>
        </thead>
        <tbody>
            {$rows}
        </tbody>
    </table>
    <div class="footer">
        {$createdTime}: {$time} | {$dataForReferenceOnly}
    </div>
</div>
</body>
</html>
HTML;
    }
}