<?php

namespace PhangoApp\WPDO;

class WPDO {

    static public $host_db='';

    static public $db='';

    static public $login_db='';

    static public $pass_db='';
    
    static public $driver='mysql';
    
    static public $mconn=null;
    
    public $conn;
    
    public $sth;
    
    public $table;
    
    public $last_query;
    
    public $field_delimiter='`';
    
    //static public $conn=false;
    
    public function __construct($table) {
        
        $this->table=$table;
        
        if(WPDO::$mconn!=null) {
            
            $this->conn=WPDO::$mconn;
            
        }
        
    }
    
    public function connect() {
        
        if(WPDO::$host_db=='' || WPDO::$db=='') {
            
            echo 'Cannot connect to the mysqldb';
            
            return false;
            
        }
        
        if(WPDO::$mconn==null) {
        
            $this->conn=new \PDO(WPDO::$driver.':host='.WPDO::$host_db.';dbname='.WPDO::$db, WPDO::$login_db, WPDO::$pass_db);
            
            WPDO::$mconn=$this->conn;
            
        }
        else {
            
            $this->conn=WPDO::$mconn;
            
        }
        
        if($this->conn) {
        
            return true;
            
        }
        else {
            
            return false;
            
        }
        
    }
    
    public function query($query, $values) {
        
        $this->sth=$this->conn->prepare($query);
            
        //$this->sth->execute([$values]);
        
        return $this->sth->execute($values);
        
    }
    
    public function get_result() {
        
        return $this->sth->fetchAll();
        
    }
    
    public function select($fields, $where_sql, $values) {
        
        $fields=$this->check_fields($fields);
        
        $str_fields=implode("{$this->field_delimiter}, {$this->field_delimiter}", $fields);
        
        $query="select {$this->field_delimiter}".$str_fields."{$this->field_delimiter} from ".$this->table->name." ".$where_sql;
        
        $this->sth=$this->conn->prepare($query);
        
        $result=$this->sth->execute($values);
        
        //$this->last_query=var_dump( $this->sth->queryString, $values);
        
        return $result;
        
    }
    
    public function select_to_array($fields=[], $where_sql='', $values=[]) {
        
        if(count($fields)==0) {
            
            $fields=$this->table->fields;
            
        }
        
        
        if($this->select($fields, $where_sql, $values)) {
        
            return $this->sth->fetchAll(\PDO::FETCH_ASSOC);
            
        }
        else {
            
            return false;
            
        }
        
    }

    public function select_a_row($fields, $where_sql='', $values=[]) {
        
        if(count($fields)==0) {
            
            $fields=$this->table->fields;
            
        }
        
        if($this->select($fields, $where_sql.' limit 1', $values)) {
        
            $rows=$this->sth->fetchAll();
            
            if(count($rows)>0) {
                
                return $rows[0];
                
            }
            
            return false;
        
        }
        else {
            
            return false;
            
        }
        
    }
    
    public function select_count($where_sql, $values) {
        
        if($this->query('select count(*) from '.$this->table->name.' '.$where_sql, $values)) {
        
            $rows=$this->sth->fetchAll();
            
            if(count($rows)>0) {
                
                return $rows[0]['count(*)'];
                
            }
        
        }
        else {
            
            return false;
            
        }
        
    }
    
    public function insert($values) {
        
        $fields=array_keys($values);
        
        $values=array_values($values);
        
        $fields=$this->check_fields($fields);
        
        if(count($fields)!=count($values)) {
            
            throw new \Exception('No valid values for insert in '.$this->table->name);
            
        }
        
        $final_fields=implode("{$this->field_delimiter}, {$this->field_delimiter}", $fields);
        
        $query='insert into '.$this->table->name." ({$this->field_delimiter}".$final_fields."{$this->field_delimiter}) VALUES (".implode(',', array_fill(0, count($fields), '?')).')';
        
        $this->sth=$this->conn->prepare($query);
            
        return $this->sth->execute($values);
        
    }
    
    public function update($fields, $values_update, $where_sql, $values) {
        
        $fields=$this->check_fields($fields);
        
        if(count($fields)!=count($values_update)) {
            
            throw new \Exception('No valid values for insert in '.$this->table->name);
            
        }
        
        $final_fields=[];
        
        foreach($fields as $field) {
            
            $final_fields[]="{$this->field_delimiter}".$field."{$this->field_delimiter}=?";
            
        }
        
        $str_fields=implode(' AND ', $final_fields);
        
        $query='update '.$this->table->name.' SET '.$str_fields.' '.$where_sql;
        //echo $query;
        $final_values=array_merge($values_update, $values);
        
        $this->sth=$this->conn->prepare($query);
            
        return $this->sth->execute($final_values);
        
    }
    
    public function check_fields($fields) {
        
        if($fields[0]!='*') {
        
            $final_fields=[];
            
            foreach($fields as $field) {
                
                if(in_array($field, $this->table->fields)) {
                    
                    $final_fields[]=$field;
                    
                }
                
            }
        
        }
        else {
            
            $final_fields=['*'];
            
        }
        
        if(count($final_fields)==0) {
            
            throw new \Exception('No valid fields selected in '.$this->table->name.' Valid fields are '.implode(', ', $this->table->fields).' . Fields passed are: '.implode(', ', $fields));
            
        }
     
        return $final_fields;
    
    }

}