<?php

/**
 * 同布表格数据基类
 * User: ben
 */
class Sync_Base extends Singleton {
    protected $objRedis;
    protected $objTable;

    /**
     * 表名
     * @var string
     */
    protected $code;

    /**
     * 表名
     * @var string
     */
    protected $tableName;

    /**
     * 合约表名，默认跟tableName一样
     * @var string
     */
    protected $codeTable;


    /**
     * 缓存的key
     * @var string
     */
    protected $cacheKey = 'default';

    /**
     * 数据库key
     * @var string
     */
    protected $dbKey = 'default';

    /**
     * 主键的字段名
     * @var string
     */
    protected $priKey;

    /**
     * 关键数据字段（无需传主键）
     * @var array
     */
    protected $dataField = [];

    /**
     * 索引的字段名
     * @var string
     */
    protected $indexName;

    /**
     * 索引，Index number, 1 - primary (first), 2 - secondary index (in order defined by multi_index), 3 - third index, etc.
     * @var int
     */
    protected $index = 1;

    /**
     * 索引类型，The key type of --index, primary only supports (i64), all others support (i64, i128, i256, float64, float128, ripemd160, sha256).
     * @var string
     */
    protected $keyType = 'i64';

    /**
     * 频率，几秒同步一次
     * @var int
     */
    protected $frequency = 10;

    /**
     * 数据清除间隔
     * @var int
     */
    protected $clearTtl = -1;

    /**
     * 清除数据的动作名
     * @var null
     */
    protected $clearAction = null;

    /**
     * 执行最大次数
     * @var int
     */
    protected $maxTimes = 1000;

    /**
     * 数据表查询条件
     * @var array
     */
    protected $dataTableWhere;

    public function __construct($tableName, $priKey = 'id', $indexName = 'id', $codeTable = null, $code = null, $dataTableWhere = []) {
        $this->tableName = $tableName;
        $this->codeTable = $codeTable ?: $tableName;

        $this->priKey = $priKey;
        $this->indexName = $indexName;
        $this->code = $code ?: $GLOBALS['codeMee'];
        $this->dataTableWhere = $dataTableWhere ?: [];

        $this->objRedis = dwRedis::init($this->cacheKey);
        $this->objTable = new TableHelper($this->tableName, $this->dbKey);
    }

    private static function getPreKey($tableName) {
        return "globals:syncEosTable:{$tableName}:";
    }

    private static function _getClearKey($tableName) {
        return "globals:clearEosTable:{$tableName}";
    }

    protected static function getRequestKey($tableName) {
        return self::getPreKey($tableName) . 'request';
    }

    protected static function getResponseKey($tableName) {
        return self::getPreKey($tableName) . 'response';
    }

    public function isTimeout($time) {
        $responseKey = self::getResponseKey($this->tableName);
        $runTime = $this->objRedis->get($responseKey);
        $span = $time - $runTime;
        if ($span >= $this->frequency) {
            $msg = "Sync {$this->code}.{$this->codeTable} => {$this->dbKey}.{$this->tableName} timeout, time:{$time}, runTime:{$runTime}, span:{$span} > frequency:{$this->frequency}";
            Eos::log($msg);
            if ($runTime && $span > $this->frequency * 5 && $span > 10) {
                alermErrorMsg($msg);
            }

            return true;
        } else {
            return false;
        }
    }

    public function pubSubscribe($waitNewer = true, $all = false) {
        $time = microtime(true);
        $requestKey = self::getRequestKey($this->tableName);
        $this->objRedis->setex($requestKey, $this->frequency, $time);
        // Eos::log("time:{$time}");
        Eos::pubEvent($requestKey, compact('time', 'all'));

        if ($waitNewer) {
            // 最多等10秒
            for ($i = 0; $i < 100; $i++) {
                $responseKey = self::getResponseKey($this->tableName);
                $runTime = $this->objRedis->get($responseKey);
                if ($runTime > $time) {
                    // Eos::log("runTime:{$runTime} > time:{$time}");
                    return true;
                } else {
                    // Eos::log("sleep, runTime:{$runTime} < time:{$time}");
                    // 休息 100ms
                    Tool::usleep(100 * 1000);
                }
            }
        }

        return false;
    }

    public function getNewestDatas($lower = null, $limit = 1000) {
        $url = "{$GLOBALS['eosUrl']}v1/chain/get_table_rows";

        $objHttp = new dwHttp();
        $data = [
            'scope' => $this->code,
            'code' => $this->code,
            'table' => $this->codeTable,
            'json' => true,
            'limit' => $limit,
            'key_type' => $this->keyType,
            'index_position' => $this->index,
        ];

        if ($lower) {
            $data['lower_bound'] = $lower;
        }

        // 第一次2秒就超时
        $json = $objHttp->post2($url, json_encode($data), 5, 2);
        $datas = json_decode($json, true);

        Eos::log("get {$this->code} {$this->codeTable} lower:{$lower}, count:" . count($datas['rows']));

        return $datas;
    }

    protected function updateRow($row, $priValue, $dbRow) {
        if ($this->dataField) {
            $newRow = arrayFilter($row, $this->dataField);
            $needUpdate = false;
            foreach ($newRow as $k => $v) {
                if ($dbRow[$k] != $v) {
                    $needUpdate = true;
                    break;
                }
            }

            // 不需要更新，则跳过
            if (!$needUpdate) {
//                Eos::log("skip same row, priKey:{$dbRow[$this->priKey]}, dbRow:" . json_encode($dbRow));
                return;
            }
        }

        $this->objTable->updateObject($row, [$this->priKey => $priValue]);
        Eos::log("update {$this->tableName}, dbRow:" . json_encode($dbRow));
        Eos::log("update {$this->tableName}, new row:" . json_encode($row));
    }

    protected function addNewRows($newRows) {
        // 批量添加
        Eos::log("addObjectsIfNoExist {$this->tableName} count:" . count($newRows));
        foreach ($newRows as $newRow) {
            Eos::log("addNewRow {$this->tableName}: new row:" . json_encode($newRow));
        }

        $this->objTable->addObjectsIfNoExist($newRows);
    }

    protected function tryClearData() {
        if ($this->clearTtl > 0) {
            $key = $this->_getClearKey($this->tableName);
            $flag = $this->objRedis->exists($key);
            Eos::log("exists ClearKey:{$flag}");

            if (!$flag) {
                $this->clearData();
                $this->objRedis->setex($key, $this->clearTtl, time());
            }
        }
    }

    /**
     * 清除数据
     */
    protected function clearData() {
        if ($this->clearAction) {
            // 取倒数第20条
            $_sortKey = "update_time_int DESC";
            $last = $this->objTable->getRow(compact('_sortKey'));
            $update_time_int = $last['update_time_int'];
            $maxUpdateTime = 1000000 * (time() - 180);
            $update_time_int = max($update_time_int, $maxUpdateTime);

            // 清除数据
            $cmd = "cleos -u {$GLOBALS['eosUrl']} push action {$this->code} {$this->clearAction} '[ \"{$update_time_int}\" ]' -j -p {$this->code}";
            $json = Eos::execCmd($cmd);
            $ret = json_decode($json, true);

            Eos::log($cmd);
            Eos::log("transaction_id: {$ret['transaction_id']}");
            return $ret['transaction_id'];
        } else {
            throw new Exception("{$this->tableName} have not clearAction");
        }
    }

    /**
     * 更新数据库，返回新增数据 和 更新的数据
     *
     * @param $rows
     *
     * @return array
     */
    protected function updateDb($rows) {
        if (!$rows) {
            return [];
        }

        $_field = "`{$this->priKey}`";
        if ($this->dataField) {
            $_field .= ", `" . join("`, `", $this->dataField) . "`";
        }

        // 考虑到有可能会丢数据，所以不能只拿合约上的数据
        $ids = array_column($rows, $this->priKey);
//        $existMap = $this->objTable->getAll(, compact('_field'));

        // 获取线上时间最小的时间
        $maxTime = time() * 1000000;
        foreach ($rows as $row) {
            $maxTime = max($row[$this->indexName], $maxTime);
        }

        $_where = "`{$this->indexName}` >= '{$maxTime}' ";
        if ($ids) {
            $_where .= " OR `{$this->priKey}` IN ('" . join("', '", $ids) . "') ";
        }
        $existMap = $this->objTable->getAll(compact('_field', '_where'));

        $existMap = arrayFormatKey($existMap, $this->priKey);
        $existMap2 = $existMap;

        $newDatas = [];
        foreach ($rows as $row) {
            $id = $row[$this->priKey];
            $dbRow = $existMap[$id];
            if ($dbRow) {
                // 匹配到，则删除
                unset($existMap2[$id]);
                // 去掉主键
                unset($row[$this->priKey]);
                $this->updateRow($row, $id, $dbRow);
            } else {
                $newDatas[] = $row;
            }
        }

        if ($newDatas) {
            // 转化回数组
            $this->addNewRows($newDatas);
        }

        if ($existMap2) {
            $objLostLog = new TableHelper('lost_log', 'dw_eos');
            // 要删除的多余数据...，这个是因为交易丢失造成的脏数据
            $lostLogs = [];
            $lostIds = [];

            $timeout = (time() - 15) * 1000000;
            foreach ($existMap2 as $id => $lostRow) {
                // 超过15秒的数据，还出现丢失，说明有问题
                if ($lostRow['update_time_int'] < $timeout) {
                    $lostLogs[] = [
                        'db_name' => $this->dbKey,
                        'table_name' => $this->tableName,
                        'pri_key' => $id,
                        'data' => json_encode($lostRow),
                    ];
                    $lostIds[] = $id;
                }
            }

            if ($lostIds) {
                // 删除数据，并记录log
                $objLostLog->addObjects2($lostLogs);

                // 先注释删除
//                $this->objTable->delObject([$this->priKey => $lostIds]);

                // 来个告警
                alermErrorMsg("同步{$this->tableName}, 发现脏数据, id:" . join(',', $lostIds));
            }
        }

        // 添加数据的时候，尝试删除老数据
        $this->tryClearData();

        return compact('existMap', 'newDatas');
    }

    /**
     * 同步一次
     */
    public function syncOnce($all = false) {
        if ($all) {
            $maxIndex = null;
        } else {
            // 注意，这里最新的数据可能是不靠谱的，需要过了3分钟的不可逆的数据才靠谱
            $maxIndex = $this->objTable->getOne($this->dataTableWhere, [
                '_field' => "`{$this->indexName}`",
                '_sortKey' => "`{$this->indexName}` DESC"
            ]);

            // 获取3分钟内的数据
            $maxIndex = min($maxIndex, (time() - 180) * 1000000);
        }

        $ret = $this->getNewestDatas($maxIndex);
        $this->updateDb($ret['rows']);

        return $ret;
    }


    /**
     * 守卫进程，定时同步
     */
    public function syncDaemon() {
        $this->sync();
        // 订阅事件
        $requestKey = self::getRequestKey($this->tableName);
        try {
            $objSubRedis = dwRedis::initNewOne($this->cacheKey);
            $objSubRedis->setOption(Redis::OPT_READ_TIMEOUT, $this->frequency * $this->maxTimes);
            $objSubRedis->subscribe([$requestKey], function($objRedis, $channel, $json) use($requestKey) {
                $data = json_decode($json, true);
                $max = (int) ($this->objRedis->get($requestKey) * 1000);
                $time = (int) ($data['time'] * 1000);
                if ($time >= $max) {
//                    Eos::log("subscribe channel: {$channel}, all:{$data['all']}, msg: {$data['time']} >= max: {$max}");
                    $this->sync($data['all']);
                } else {
                    Eos::log("skip, msg:{$data['time']} < max:{$max}.");
                }
            });
        } catch (RedisException $ex) {
            Eos::log("timeout, ex:" . $ex->getMessage());
        }
    }

    /**
     * 守卫进程，定时同步
     */
    private function sync($all = false, $times = 0) {
        if ($times++ > $this->maxTimes) {
            return;
        }

        $runTime = microtime(true);
        $this->syncOnce($all);
        $responseKey = self::getResponseKey($this->tableName);
        $this->objRedis->setex($responseKey, $this->frequency * 10, $runTime);

        $requestKey = self::getRequestKey($this->tableName);
        $requestTime = $this->objRedis->get($requestKey);
        if ($requestTime >= $runTime) {
            Eos::log("find requestTime: {$requestTime}, syncDaemon at once.");
            $clientNum = Eos::pubEvent($responseKey, $runTime);
            Eos::log("pubEvent: {$responseKey}, clientNum: {$clientNum}");
            $this->afterSync();
            $this->sync($all, $times);
        } else {
            $this->afterSync();
        }

        $msg = 'sync done, memory used: ' . memory_get_usage() . ' bytes';
        CallLog::logSelfCall(CODE_SUCCESS, $msg);

        // 记录日志后，重置时间，才能统计每次循环所用的时间
        global $startTime;
        $startTime = microtime(true);

    }

    protected function afterSync() {

    }

    protected function formatDateTime($str) {
        if (strpos($str, 'T') > 0) {
            return date('Y-m-d H:i:s', strtotime($str) + 8 * 3600);
        } else {
            return date('Y-m-d H:i:s', strtotime($str));
        }
    }

}