<?php
namespace Mysql;
use Our\ApiConst;

/**
 * Db_MySQL  辅助MySql生成sql语句
 *
 * @category Db
 * @package  MySQL
 * @version  1.0
 */
class LinkMySQLModel{

    private static $_configs   = array();
    private static $_instances = array();

    protected $_connection = NULL;
    protected $_type       = 'SELECT';
    protected $_table      = NULL;
    protected $_limit      = NULL;
    protected $_where      = NULL;
    protected $_join       = NULL;
    protected $_group      = NULL;
    protected $_selects    = array();
    protected $_inserts    = array();
    protected $_updates    = array();
    protected $_orders     = array();
    protected $_sqls       = array();
    protected $delimiter   = '`';
    protected $comma       = ', ';
    private $lastSql='';
    protected $bTransactionInProgress=FALSE;


    public static function get($database='resources.database.slave.params') {
        if ( empty(self::$_configs[$database]) ) {
            $config = \Yaf\Registry::get('config')->get($database);
            $config = $config->toArray();
            self::$_configs[$database]=$config;
        }

        if ( ! isset(self::$_instances[$database]) ) {;
            $row      = self::$_configs[$database];
            $instance = new LinkMySQLModel( $row['hostname'], $row['username'], $row['password'], $row['database'] );
            self::$_instances[$database] = $instance;
            return $instance;
        }
        return self::$_instances[$database];
//        if ( empty(self::$_configs) ) {
//            $config = new Yaf_Config_Ini(APP_PATH . "/config/database.ini",APP_ENV);
//            $config = $config->toArray();
//
//            foreach ($config['mysql'] AS $key => $row) {
//                self::$_configs[$key] = $row;
//            }
//        }
//        if ( ! isset(self::$_instances[$database]) ) {
//            $row      = self::$_configs[$database];
//            $instance = new Db_LinkMySQL( $row['host'], $row['user'], $row['password'], $row['database'] );
//            self::$_instances[$database] = $instance;
//            return $instance;
//        }
//        return self::$_instances[$database];
    }


    /**
     * 构造函数 选择数据库
     */
    public function __construct($hostname, $username, $password, $database) {
        if ( ! $this->_connection = mysqli_connect($hostname, $username, $password, $database)) {
            die('Error: Could not make a database _connection using ' . $username . '@' . $hostname);
        }
        mysqli_options($this->_connection,MYSQLI_OPT_INT_AND_FLOAT_NATIVE,TRUE);
        mysqli_query($this->_connection, "SET NAMES 'utf8'");
        mysqli_query($this->_connection, "SET CHARACTER SET utf8");
        mysqli_query($this->_connection, "SET CHARACTER_SET_CONNECTION=utf8");
        mysqli_query($this->_connection, "SET SQL_MODE = ''");
    }
    // 析构函数
    function __destruct()
    {
        // 检查未被处理的事务, 未处理事务将被 RollBack
        if ($this->bTransactionInProgress == TRUE) {
            $this->doRollback();

        }
        if (isset($this->_connection)) { // 只有成功连接才进行释放, (避免连接失败时,导致的错误释放)
            mysqli_close($this->_connection);
        }
    }

    /**
     * countAffected 返回影响行
     * @access public
     *
     * @return int 影响行
     */
    public function countAffected() {
        return mysqli_affected_rows($this->_connection);
    }


    /**
     * getInsertId  返回最新插入的Id
     * @access public
     *
     * @return int 最新id值
     */
    public function getInsertId() {
        return mysqli_insert_id($this->_connection);
    }


    /**
     * query 执行SQL操作
     * @access public
     *
     * @param mixed $sql   SQL字符串或者SQL对象
     * @return mixed 如果是Resource返回对象，否则返回影响行/最新插入id
     */
    public function query($sql) {
        if ( is_object($sql) ) {
            $sql = $sql->_toSQL();
        }

        $resource = mysqli_query($this->_connection, $sql);
        if(! $resource) {
            if ( APP_ENV != 'product' ) {
                die('Error: ' . mysqli_error($this->_connection) . '<br />Error No: ' . mysqli_errno($this->_connection) . '<br />' . $sql);
            } else {
                die('DataBase Error');
            }
        }

        if($this->_type == 'SELECT') {
            $i = 0; $data = array();
            while ($result = mysqli_fetch_assoc($resource)) {
                $data[$i] = $result;
                $i++;
            }
            mysqli_free_result($resource);

            $query = new \stdClass();
            $query->one  = isset($data[0]) ? $data[0] : FALSE;
            $query->rows = empty($data) ? FALSE : $data;
            $query->num  = $i;

            unset($data);
            return $query;
        } else {
            return ( $this->_type == 'INSERT' ) ? $this->getInsertId() : $this->countAffected();
        }
    }



    /**
     * delimiter 给字段增加定界符
     * @access private
     *
     * @param string $field 字段名
     * @return string
     */
    private function _delimiter($field) {
        return $this->delimiter . $field . $this->delimiter;
    }


    /**
     * _toSQL 构造SQL语句
     * @access private
     *
     * @return string sql语句
     */
    private function _toSQL(){
        if ( empty($this->_type) )
            $this->_type = 'SELECT';

        $this->_type = strtoupper($this->_type);
        switch ($this->_type) {

            case "SELECT":
                $sql = "SELECT ";
                if ( empty( $this->_selects ) )
                    $sql .= "*";
                else {
                    foreach ( $this->_selects AS $select_field ) {
                        //没有括号，说明不是Mysql函数，
                        if ( strpos($select_field, '(') === FALSE )
                            $select_field = $this->_delimiter( $select_field );
                    }
                }
                $sql .= implode( ', ', $this->_selects );
                $sql .= " FROM ";
                $sql .= strpos($this->_table, ',') ? $this->_table : $this->_delimiter( $this->_table );

                if ( $this->_join )
                    $sql .= $this->_join;

                if ( $this->_where )
                    $sql .= " WHERE " . $this->_where;

                //GROUP BY
                if ( ! empty( $this->_group) ) {
                    //$sql .= " GROUP BY " . $this->_delimiter($this->_group);
                    $_groups = [];
                    foreach ($this->_group as $field) {
                        $_groups[] = $this->_delimiter($field);
                    }
                    $sql .= " GROUP BY " . implode(', ', $_groups);
                }

                //ORDER BY
                if ( ! empty( $this->_orders ) ) {
                    $_orders = array();
                    foreach ( $this->_orders AS $field => $sort) {
                        //没有括号，说明不是Mysql函数，
                        if ( strpos($field, '(') === FALSE )
                            $_orders[] = $this->_delimiter( $field ) . ' ' . $sort;
                        else
                            $_orders[] = $field;
                    }
                    $sql .= " ORDER BY " . implode(', ', $_orders);
                }

                //LIMIT
                if ( $this->_limit )
                    $sql .= " LIMIT " . $this->_limit;

                break;

            case "INSERT":
                $sql_insert = $sql_value = '';
                foreach ($this->_inserts AS $field => $value) {
                    $sql_insert .= $this->_delimiter($field) . $this->comma;
                    $sql_value  .= "'{$value}'" . $this->comma;
                }
                $sql_insert = trim($sql_insert, $this->comma);
                $sql_value  = trim($sql_value, $this->comma);

                $sql  = "INSERT INTO ";
                $sql .= $this->_delimiter( $this->_table );
                $sql .= " ({$sql_insert}) VALUES ({$sql_value}) ";
                break;

            case "UPDATE":
                $sql_update = '';
                foreach ($this->_updates AS $field => $row) {
                    $value = $row['value'];
                    if ( $row['type'] == 'equal' ) {
                        $sql_update .= $this->_delimiter($field) . " = '{$value}'" .  $this->comma;
                    } elseif ( $row['type'] == 'identity' ) {
                        $sql_update .= $this->_delimiter($field) . " = " . $this->_delimiter($field) . $value .  $this->comma;
                    }
                }
                $sql_update = trim($sql_update, $this->comma);

                $sql  = "UPDATE ";
                $sql .= $this->_delimiter( $this->_table );
                $sql .= " SET {$sql_update}";

                if ( $this->_where )
                    $sql .= " WHERE " . $this->_where;
                //LIMIT
                if ( $this->_limit )
                    $sql .= " LIMIT " . $this->_limit;
                break;

            case "DELETE":
                $sql  = "DELETE FROM ";
                $sql .= $this->_delimiter( $this->_table );
                if ( $this->_where )
                    $sql .= " WHERE " . $this->_where;

                //LIMIT
                if ( $this->_limit )
                    $sql .= " LIMIT " . $this->_limit;
                break;

        }
        $sql .= ';';
        $this->lastSql=$sql;
        $this->_clear();
        return $sql;
    }
    public function getLastSql(){
        return $this->lastSql;
    }


    /**
     * __toString 魔法方法，当输出这个对象的时候转化成SQL字符串
     * @access public
     *
     * @return string
     */
    public function __toString() {
        return $this->_toSQL();
    }


    /**
     * _clear 清除sql组合
     * @access private
     *
     * @return mixed Value.
     */
    private function _clear(){
        $this->_table   = $this->_limit   = $this->_where   = $this->_join    = $this->_group = NULL ;
        $this->_selects = $this->_inserts = $this->_updates = $this->_orders  = array();
    }


    /**
     * fetchNum 返回记录数量
     * @access public
     *
     * @return int
     */
    public function fetchNum() {
        $this->_selects = array('COUNT(*) AS count');
        $row = $this->fetchOne();
        return intval($row['count']);
    }


    /**
     * fetchValue 返回结果集中第一个字段的值
     * @access public
     *
     * @return array
     */
    public function fetchValue() {
        $sql = $this->limit(1)->_toSQL();
        $row = $this->query( $sql )->one;
        return ($row === FALSE) ? FALSE : array_shift($row);
    }


    /**
     * fetchOne 返回单行数组
     * @access public
     *
     * @return array
     */
    public function fetchOne() {
        $sql = $this->limit(1)->_toSQL();
        return $this->query( $sql )->one;
    }


    /**
     * fetchAll 返回多行数组
     * @access public
     *
     * @return array
     */
    public function fetchAll() {
        $sql = $this->_toSQL();
        return $this->query( $sql )->rows;
    }


    /**
     * queue   把SQL语句按顺序存起来
     * @access public
     *
     * @return object
     */
    public function queue() {
        $sql = $this->_toSQL();
        $this->_sqls[] = $sql;
        return $this;
    }


    /**
     * toQueueString 查看多条SQL
     * @access public
     *
     * @return array
     */
    public function toQueueString() {
        $sql = '';
        foreach( $this->_sqls AS $_sql) {
            $sql .= $_sql . PHP_EOL;
        }

        return $sql;
    }


    /**
     * executeQueue 执行已经保存的多条SQL语句
     * @access public
     *
     * @return array
     */
    public function executeQueue() {
        $sql = $this->toQueueString();
        return $this->query( $sql );
    }


    /**
     * execute 执行mysql
     * @access public
     *
     * @return array
     */
    public function execute() {
        $sql = $this->_toSQL();
        return $this->query( $sql );
    }


    /**
     * toString 返回SQL局域
     * @access public
     *
     * @return string.
     */
    public function toString() {
        return $this->_toSQL();
    }


    /**
     * group
     * @access public
     *
     * @param   string $field 字段
     * @return  object
     * @example $this->order('field_1 DESC', 'field_2 ASC')
     */
    public function group($field) {
        //$this->_group = $field;
        if($field) {
            $this->_group[] = $field;
        }
        return $this;
    }


    /**
     * order 排序字段
     * @access public
     *
     * @return  object
     * @example $this->order('field_1', 'DESC')
     */
    function order($field, $sort='ASC') {
        $sort = strtoupper($sort);
        $sort = in_array( $sort, array('ASC', 'DESC') ) ? $sort : 'ASC';

        if ( ! array_key_exists( $field, $this->_orders ) ) {
            $this->_orders[$field] = $sort;
        }
        return $this;
    }

    /**
     * _where 查询条件设置
     * @access private
     *
     * @param $field	字段(字符串/数组)
     * @param $value	值
     * @param $operator 运算符,默认"AND"
     * @example _where(字段,值) | _where(array('字段'=>'值')) | _where("字符串")
     */
    function _where($field, $value=FALSE, $operator="AND"){
        if( empty($field) ) {
            return $this;
        }

        $operator = strtoupper($operator);
        $operator = $operator == 'AND' ? 'AND' : 'OR';
        if ( is_array($field) ) {
            //格式:(array('字段'=>'值'))
            $field = $this->escape($field);
            foreach ($field AS $f => $value){
                if ( ! empty($this->_where) ) $this->_where .= $operator;
                $this->_where .= " ($f = '{$value}') ";
            }
        } else {
            if ( ! empty($this->_where) ) {
                $this->_where .= $operator;
            }

            if ( $value !== FALSE ) {
                $value = $this->escape($value);
                $this->_where .= " ($field = '{$value}') ";
            } else {
                $this->_where .= " ($field) ";
            }
        }
        return $this;
    }

    /**
     * where 查询条件AND
     * @access public
     *
     * @param  $field	字段(字符串/数组)
     * @param  $value	值
     * @return object
     */
    function where($field, $value=FALSE){
        $this->_where($field, $value, "AND");
        return $this;
    }


    /**
     * orWhere 查询条件OR
     * @access public
     *
     * @param  $field	字段(字符串/数组)
     * @param  $value	值
     * @return object
     */
    function orWhere($field, $value=FALSE){
        $this->_where($field, $value, "OR");
        return $this;
    }


    /**
     * limit  Limit设置
     * @access public
     *
     * @param  int $start	开始位置
     * @param  int $num	    LIMIT数量
     * @return object
     */
    function limit($start, $num = "") {
        $start = intval($start);
        $num   = intval($num);
        $this->_limit = $num ? ( $start . "," . $num ) : $start;
        return $this;
    }


    /**
     * page 分页
     * @access public
     *
     * @param  int    $page     当前页
     * @param  int    $pagesize 每页数量
     * @return object
     */
    function page($page, $pagesize) {
        $page     = intval($page);
        $pagesize = intval($pagesize);
        $start    = ( $page - 1 ) * $pagesize;
        return $this->limit($start, $pagesize);
    }


    /**
     * rows 更新或者插入数组 只有 INSERT和UPDATE情况下可用
     * @access public
     * @param  array $data   更新或者插入数组
     * @return object
     */
    function rows($data) {
        if ( ! in_array( $this->_type, array('INSERT', 'UPDATE') ) )
            return $this;

        $data = $this->escape($data);
        foreach ( $data AS $field => $value ) {
            if ( $this->_type == 'INSERT' ) {
                if ( ! in_array($field, $this->_inserts) )
                    $this->_inserts[ $field ] = $value;
            } else {
                if ( ! in_array($field, $this->_updates) )
                    $this->_updates[ $field ] = array('type' => 'equal', 'value' => $value);
            }
        }
        return $this;
    }


    /**
     * set UPDATE set方法
     * @access public
     * @param  array $data   更新或者插入数组
     * @return object
     */
    function set($field, $value, $identity=FALSE) {
        if ( $this->_type != 'UPDATE' )
            return $this;

        if ( $identity === TRUE ) {
            //对字段进行自增等特殊化操作
            $this->_updates[$field] = array('type' => 'identity', 'value' => $value);
        } else {
            $this->_updates[$field] = array('type' => 'equal', 'value' => $value);
        }
        return $this;
    }


    /**
     * select 选择字段
     * @access public
     *
     * @return  object
     * @example $this->select('field_1', 'field_2', 'field_3')
     */
    public function select() {
        $this->_type	= "SELECT";

        $args = func_get_args();
        if ( empty( $args ) )
            return $this;

        foreach ( $args AS $arg ) {
            if ( is_array($arg) ) {
                foreach ($arg AS $_arg) {
                    if ( ! in_array($_arg, $this->_selects) ) {
                        $this->_selects[] = $_arg;
                    }
                }
            } else {
                if ( ! in_array($arg, $this->_selects) ) {
                    $this->_selects[] = $arg;
                }
            }
        }
        return $this;
    }


    /**
     * from 表名设置
     * @access public
     *
     * @param  string $tablename 表名
     * @return object
     * @example $this->from('newtable')
     */
    public function from($tablename) {
        $this->_table = $tablename;
        return $this;
    }


    /**
     * insert 插入数据
     * @access public
     *
     * @param  string $tablename 表名
     * @return object
     * @example $this->insert('newtable')
     */
    public function insert($tablename) {
        $this->_type	 = "INSERT";
        $this->_table = $tablename;
        return $this;
    }


    /**
     * update 更新数据
     * @access public
     *
     * @param  string $tablename 表名
     * @return object
     * @example $this->update('newtable')
     */
    public function update($tablename) {
        $this->_type  = "UPDATE";
        $this->_table = $tablename;
        return $this;
    }


    /**
     * delete 删除数据 (需要配合->where()指定条件,否则将删除整张表的数据.)
     * @access public
     *
     * @param  string $tablename 表名
     * @return object
     * @example $this->delete('newtable')
     */
    public function delete($tablename, $query=TRUE) {
        $this->_type  = "DELETE";
        $this->_table = $tablename;
        return $this;
    }



    /**
     * 关联查询
     * @param string 关联表名名称
     * @param string 关联条件
     * @param $type string 关联类型 LEFT, RIGHT, INNER
     */
    function join($tablename, $where, $type = ""){
        if ( $type ) {
            $type = strtoupper($type);
            if (! in_array($type, array('LEFT', 'RIGHT', 'INNER') ) )
                return $this;
        }
        $tablename = $this->_delimiter( $tablename );
        $where     = $this->escape($where);
        $this->_join .= " {$type} JOIN {$tablename} ON({$where}) ";
        return $this;
    }



    /**
     * SQL语句字段转义
     * @param $data
     * @param $like
     */
    function escape($data, $like = FALSE){
        if ( is_array($data) ){
            foreach ($data AS $key => $row){
                $data[$key] = $this->escape($row, $like);
            }
            return $data;
        }

        if ( function_exists('mysqli_real_escape_string') ) {
            $data = mysqli_real_escape_string($this->_connection, $data);
        } else {
            $data = addslashes($data);
        }

        if ( $like === TRUE ) {
            $data = str_replace(array('%', '_'), array('\\%', '\\_'), $data);
        }
        return $data;
    }

    /**************************************************************
     * 事务处理 (事务开始，回滚，提交)
     * ************************************************************
     */
    /**
     * 开始事务
     * @return BOOL
     */
    public function doTransaction()
    {
        $bFlag =  mysqli_autocommit($this->_connection,FALSE);
        $this->bTransactionInProgress = TRUE; // 有事务未被提交
        register_shutdown_function(array($this, "__do_shutdown_check"));
        return $bFlag;
    }

    public function __do_shutdown_check()
    {
        if ($this->bTransactionInProgress) {
            $this->doRollback();
        }
    }
    /**
     * 回滚事务
     * @return BOOL
     */
    public function doRollback()
    {
        $bFlag = mysqli_rollback($this->_connection);
         mysqli_autocommit($this->_connection,TRUE);
        $this->bTransactionInProgress = FALSE;
        return $bFlag;
    }
    /**
     * 是否已经开始事务
     * @return BOOL
     */
    public function isInTransaction()
    {
        return $this->bTransactionInProgress;
    }
    /**
     * 提交事务
     * @return BOOL
     */
    public function doCommit()
    {
        $bFlag = mysqli_commit($this->_connection);
        mysqli_autocommit($this->_connection,TRUE);
        $this->bTransactionInProgress = FALSE;
        return $bFlag;
    }


    /**
     * 将数组按一定方式格式化成部分SQL语句,不支持mysql内置函数传值
     * @param string $type ['update','insert']
     * @param string $table_fields 表字段
     * @param string $data_fields 需要操作的字段
     * @param boolean $escape 是否转义
     * @return Array
     */
    public function getSqlPartByArray($type, $data_fields)
    {
        if (!in_array($type, array('update', 'insert')) || empty($data_fields)) {
            return false;
        }

        //过滤数据源,并SQL格式化
        $sql_fields = array();
        foreach ($data_fields as $k => $v) {
            $sql_fields['`' . $k . '`'] = "'" . $v . "'";
        }

        //生成sql语句
        $return = array();
        if (!empty($sql_fields)) {
            if ($type == "insert") {
                $fields_name = array_keys($sql_fields);
                $fields_values = array_values($sql_fields);
                $return['part1'] = implode(",", $fields_name);
                $return['part2'] = implode(",", $fields_values);
            }
            if ($type == "update") {
                $update_fields = array();
                foreach ($sql_fields as $k => $v) {
                    $update_fields[] = "{$k}={$v}";
                }
                $return['part1'] = implode(", ", $update_fields);
            }
        }
        $return['type'] = $type;
        return $return;
    }

    /**
     * 数据库查询条件拼接
     * @param $array
     * @return bool|string
     */

    public function getSqlWhereByArray($array)
    {
        if (empty($array)) {
            return '';
        }
        $where = ' ';
        $m = 1;

        foreach ($array as $key => $value) {

            if ($m > 1) {
                $where .= " and ";
            }

            if (count($value) > 1) {
                if (count($value) == 2) {
                    $where .= $this->getJointWhereByTwoArray($key, $value);
                }
                if (count($value) == 3) {
                    $where .= $this->getJointWhereBySecondArray($key, $value);
                }


            } else {

                $strArray = explode('|', $key);
                $count = count($strArray);
                if ($count > 1) $where .= " ( ";
                foreach ($strArray as $k => $v) {
                    $where .= " $v = '$value'";
                    if ($k < $count - 1) $where .= " or ";
                }
                if ($count > 1) $where .= " ) ";

            }


            $m++;

        }


        return $where;


    }

    /**
     * 数据查询条件，数组内容两个
     * @param $key
     * @param $array
     * @return bool|string
     */

    public function getJointWhereBySecondArray($key, $array)
    {
        if (empty($array) || !$key || count($array) != 3) {
            return false;
        }
        $return = '';
        $k = 0;
        $whereFirst = $this->getJointWhereByTwoArray($key, $array[0]);
        $whereSecond = $this->getJointWhereByTwoArray($key, $array[1]);
        if ($whereFirst) $k++;
        if ($whereSecond) $k++;

        if ($k == 2) $return .= " ( ";
        if ($whereFirst) $return .= $whereFirst;
        if ($k == 2) $return .= " $array[2] ";
        if ($whereSecond) $return .= $whereSecond;
        if ($k == 2) $return .= " ) ";


        return $return;


    }

    /**
     * 数据查询条件，数组内容三个
     * @param $key
     * @param $array
     * @return bool|string
     */

    public function getJointWhereByTwoArray($key, $array)
    {

        if (empty($array) || !$key || count($array) != 2 || $array[1] === '' || $array[1] === null) {
            return false;
        }
        $return = '';
        $strArray = explode('|', $key);
        $count = count($strArray);
        if ($count > 1) $return .= " ( ";
        foreach ($strArray as $k => $value) {
            switch ($array[0]) {
                case 'like':
                    $return .= " $value like '$array[1]' ";
                    break;
                case 'egt':
                    $return .= " $value >= '$array[1]' ";
                    break;
                case 'gt' :
                    $return .= " $value > '$array[1]' ";
                    break;
                case 'elt':

                    $return .= " $value <= '$array[1]' ";
                    break;
                case 'eq':

                    $return .= " $value = '$array[1]' ";
                    break;
                case 'lt' :
                    $return .= " $value < '$array[1]' ";
                    break;
                case 'neq' :

                    $return .= " $value <> '$array[1]' ";
                    break;
                case 'in':
                    $return .= " {$value} in('" . implode("','", $array[1]) . "')";
                    break;
                case 'notin':
                    $return .= " {$value} not in('" . implode("','", $array[1]) . "')";
                    break;

            }
            if ($k < $count - 1) $return .= " or ";

        }
        if ($count > 1) $return .= " ) ";


        return $return;


    }

}

if ( ! function_exists('stripslashes_deep') ) {
    function stripslashes_deep($value){
        return is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value);
    }
}