<?php

namespace base\common\service;

use app\admin\model\NginxAccessLog;
use app\admin\model\NginxStatHour;
use app\admin\model\NginxStatReferer;
use app\admin\model\NginxStatUa;
use app\admin\model\NginxStatUrl;
use think\facade\Db;

/**
 * Nginx 访问日志聚合统计 Service（Base 内核）.
 *
 * 设计要点：
 * - 幂等：delete-then-insert 模式（不用 INSERT ON DUPLICATE KEY UPDATE，避免翻倍）
 * - 事务：Db::startTrans / commit / rollback 包裹所有 DELETE + INSERT
 * - top N 截断后不保留长尾（明确接受，不在 sysconfig 控制"是否截断"）
 * - 依赖倒置：内部 use app 入口 model（NginxStatHour 等），不 use Base model
 * - 只读 raw 表（ul_nginx_access_log），不做 nginx log line 解析（那是 T5 Parser 的事）
 */
class NginxLogAggregatorServiceBase
{
    /**
     * 聚合指定日期的指定小时.
     *
     * 流程：
     * 1. stat_hour：DELETE WHERE stat_date=:d AND stat_hour=:h → INSERT 1 行（该小时聚合）
     * 2. stat_url / stat_referer / stat_ua：DELETE WHERE stat_date=:d（整天重跑）→ INSERT top N 行
     *
     * @param int $statDate 日期 YYYYMMDD（如 20260728）
     * @param int $statHour 小时 0-23
     * @return array {stat_hour_rows:int, stat_url_rows:int, stat_referer_rows:int, stat_ua_rows:int}
     *
     * @throws \InvalidArgumentException 日期/小时非法
     * @throws \Throwable 事务内任何错误（已 rollback 后 rethrow）
     */
    public function aggregateHour(int $statDate, int $statHour): array
    {
        if ($statHour < 0 || $statHour > 23) {
            throw new \InvalidArgumentException("stat_hour must be 0-23, got: {$statHour}");
        }

        // 时间窗口
        $dateStr = $this->formatDateStr($statDate);
        $dayStart = strtotime("{$dateStr} 00:00:00");
        if ($dayStart === false) {
            throw new \InvalidArgumentException("invalid stat_date: {$statDate}");
        }
        $dayEnd = $dayStart + 86400;
        $hourStart = $dayStart + $statHour * 3600;
        $hourEnd = $hourStart + 3600;

        // topN 配置（topn=0 时不限制）
        $topn = (int) sysconfig('nginx_log', 'topn_default', 10);

        // 表名（带前缀）。框架默认连接是 main（不是 mysql），按 default 取连接 prefix
        $conn = (string) config('database.default', 'main');
        $prefix = (string) config("database.connections.{$conn}.prefix", 'ul_');
        $rawTable = $prefix . 'nginx_access_log';
        $hourTable = $prefix . 'nginx_stat_hour';
        $urlTable = $prefix . 'nginx_stat_url';
        $refererTable = $prefix . 'nginx_stat_referer';
        $uaTable = $prefix . 'nginx_stat_ua';

        Db::startTrans();
        try {
            // 1. stat_hour：DELETE + INSERT 1 行
            NginxStatHour::where('stat_date', $statDate)
                ->where('stat_hour', $statHour)
                ->delete();

            $hourSql = "INSERT INTO `{$hourTable}`
                (stat_date, stat_hour, pv, uv, total_bytes, status_2xx, status_3xx, status_4xx, status_5xx, status_other, avg_request_time)
                SELECT :stat_date, :stat_hour,
                    COUNT(*) AS pv,
                    COUNT(DISTINCT remote_addr) AS uv,
                    COALESCE(SUM(body_bytes_sent), 0) AS total_bytes,
                    COALESCE(SUM(CASE WHEN status BETWEEN 200 AND 299 THEN 1 ELSE 0 END), 0) AS status_2xx,
                    COALESCE(SUM(CASE WHEN status BETWEEN 300 AND 399 THEN 1 ELSE 0 END), 0) AS status_3xx,
                    COALESCE(SUM(CASE WHEN status BETWEEN 400 AND 499 THEN 1 ELSE 0 END), 0) AS status_4xx,
                    COALESCE(SUM(CASE WHEN status BETWEEN 500 AND 599 THEN 1 ELSE 0 END), 0) AS status_5xx,
                    COALESCE(SUM(CASE WHEN status < 200 OR status > 599 THEN 1 ELSE 0 END), 0) AS status_other,
                    COALESCE(AVG(request_time), 0) AS avg_request_time
                FROM `{$rawTable}`
                WHERE time_local >= :hour_start AND time_local < :hour_end
                HAVING COUNT(*) > 0";

            $statHourRows = (int) Db::execute($hourSql, [
                'stat_date'  => $statDate,
                'stat_hour'  => $statHour,
                'hour_start' => $hourStart,
                'hour_end'   => $hourEnd,
            ]);

            // 2. stat_url：DELETE（整天）+ INSERT topN
            NginxStatUrl::where('stat_date', $statDate)->delete();

            $urlLimit = $topn > 0 ? 'LIMIT ' . $topn : '';
            $urlSql = "INSERT INTO `{$urlTable}`
                (stat_date, uri, pv, uv, total_bytes, avg_request_time)
                SELECT :stat_date, uri,
                    COUNT(*) AS pv,
                    COUNT(DISTINCT remote_addr) AS uv,
                    COALESCE(SUM(body_bytes_sent), 0) AS total_bytes,
                    COALESCE(AVG(request_time), 0) AS avg_request_time
                FROM `{$rawTable}`
                WHERE time_local >= :day_start AND time_local < :day_end
                GROUP BY uri
                ORDER BY pv DESC
                {$urlLimit}";

            $statUrlRows = (int) Db::execute($urlSql, [
                'stat_date'  => $statDate,
                'day_start'  => $dayStart,
                'day_end'    => $dayEnd,
            ]);

            // 3. stat_referer：DELETE + INSERT topN（从 http_referer 提取 domain）
            NginxStatReferer::where('stat_date', $statDate)->delete();

            $refererLimit = $topn > 0 ? 'LIMIT ' . $topn : '';
            $refererSql = "INSERT INTO `{$refererTable}`
                (stat_date, referer_domain, pv, uv)
                SELECT :stat_date,
                    CASE
                        WHEN http_referer IS NULL OR http_referer = '' OR http_referer = '-' THEN '-'
                        ELSE SUBSTRING_INDEX(
                            SUBSTRING_INDEX(
                                REPLACE(REPLACE(http_referer, 'https://', ''), 'http://', ''),
                                '/', 1
                            ),
                            '?', 1
                        )
                    END AS referer_domain,
                    COUNT(*) AS pv,
                    COUNT(DISTINCT remote_addr) AS uv
                FROM `{$rawTable}`
                WHERE time_local >= :day_start AND time_local < :day_end
                GROUP BY referer_domain
                ORDER BY pv DESC
                {$refererLimit}";

            $statRefererRows = (int) Db::execute($refererSql, [
                'stat_date'  => $statDate,
                'day_start'  => $dayStart,
                'day_end'    => $dayEnd,
            ]);

            // 4. stat_ua：DELETE + INSERT topN（从 http_user_agent 分类）
            NginxStatUa::where('stat_date', $statDate)->delete();

            $uaLimit = $topn > 0 ? 'LIMIT ' . $topn : '';
            $uaSql = "INSERT INTO `{$uaTable}`
                (stat_date, ua_type, ua_name, pv, uv)
                SELECT :stat_date,
                    CASE
                        WHEN http_user_agent LIKE '%bot%'
                            OR http_user_agent LIKE '%spider%'
                            OR http_user_agent LIKE '%crawl%'
                            OR http_user_agent LIKE '%slurp%'
                            OR http_user_agent LIKE '%bingpreview%'
                            OR http_user_agent LIKE '%facebookexternalhit%'
                            OR http_user_agent LIKE '%twitterbot%' THEN 'spider'
                        WHEN http_user_agent IS NULL OR http_user_agent = '' OR http_user_agent = '-' THEN 'unknown'
                        WHEN http_user_agent LIKE '%Mozilla%'
                            OR http_user_agent LIKE '%Chrome%'
                            OR http_user_agent LIKE '%Safari%'
                            OR http_user_agent LIKE '%Firefox%'
                            OR http_user_agent LIKE '%Edg%'
                            OR http_user_agent LIKE '%Opera%'
                            OR http_user_agent LIKE '%MSIE%'
                            OR http_user_agent LIKE '%Trident%' THEN 'browser'
                        ELSE 'unknown'
                    END AS ua_type,
                    CASE
                        WHEN http_user_agent LIKE '%Googlebot%' THEN 'Googlebot'
                        WHEN http_user_agent LIKE '%Baiduspider%' THEN 'Baiduspider'
                        WHEN http_user_agent LIKE '%bingbot%' THEN 'Bingbot'
                        WHEN http_user_agent LIKE '%DuckDuckBot%' THEN 'DuckDuckBot'
                        WHEN http_user_agent LIKE '%YandexBot%' THEN 'YandexBot'
                        WHEN http_user_agent LIKE '%Edg/%' THEN 'Microsoft Edge'
                        WHEN http_user_agent LIKE '%OPR/%' OR http_user_agent LIKE '%Opera%' THEN 'Opera'
                        WHEN http_user_agent LIKE '%Firefox/%' THEN 'Firefox'
                        WHEN http_user_agent LIKE '%Chrome/%' THEN 'Chrome'
                        WHEN http_user_agent LIKE '%Safari/%' THEN 'Safari'
                        WHEN http_user_agent LIKE '%MSIE%' OR http_user_agent LIKE '%Trident%' THEN 'Internet Explorer'
                        WHEN http_user_agent IS NULL OR http_user_agent = '' OR http_user_agent = '-' THEN 'Unknown'
                        ELSE 'Other'
                    END AS ua_name,
                    COUNT(*) AS pv,
                    COUNT(DISTINCT remote_addr) AS uv
                FROM `{$rawTable}`
                WHERE time_local >= :day_start AND time_local < :day_end
                GROUP BY ua_type, ua_name
                ORDER BY pv DESC
                {$uaLimit}";

            $statUaRows = (int) Db::execute($uaSql, [
                'stat_date'  => $statDate,
                'day_start'  => $dayStart,
                'day_end'    => $dayEnd,
            ]);

            Db::commit();

            return [
                'stat_hour_rows'    => $statHourRows,
                'stat_url_rows'     => $statUrlRows,
                'stat_referer_rows' => $statRefererRows,
                'stat_ua_rows'      => $statUaRows,
            ];
        } catch (\Throwable $e) {
            Db::rollback();
            throw $e;
        }
    }

    /**
     * 将 int 日期 YYYYMMDD 格式化为 "YYYY-MM-DD".
     */
    protected function formatDateStr(int $statDate): string
    {
        $y = intdiv($statDate, 10000);
        $m = intdiv($statDate % 10000, 100);
        $d = $statDate % 100;
        return sprintf('%04d-%02d-%02d', $y, $m, $d);
    }
}