<?php

class Connector {

	private $bdd;

	function __construct() {
		$host = "localhost";
		$db = "burgerquizz";
		$user = "alain";
		$pass = "chabat";

		$this->bdd = new PDO("mysql:host=$host;dbname=$db", $user, $pass);
		$this->bdd->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
	}

	/*
		Exemple de $options :

		$options = array(
			"where" => array(
				array("foo", "=", "bar"),
				array("blbl", ">", 5)
			),
			"order by" => array("foo", "desc"),
			"limit" => array(0, 10) // Ou array(10)
		);
	*/
	function Select($fields, $tables, $options = array()) {
		$request = "SELECT $fields FROM $tables ";
		$arrayVerif = array();
		foreach($options as $name=>$value) {
			if(($upName = strtoupper($name)) == "WHERE") {
				$whereClause = " $upName ";
				foreach($value as $array) {
					if(sizeof($array) != 3 && sizeof($array) != 4) {
						throw new Exception('wrong_arg_nmbr_where');
					}
					if(sizeof($array) == 3) {
						$whereClause .= $array[0]." ".$array[1]." ? AND ";
						array_push($arrayVerif, $array[2]);
					} else {
						$whereClause .= $array[0]." ".$array[1]." ".$array[2]." AND ";
					}
				}
				$request .= substr($whereClause, 0, -5);
			} else if(($upName = strtoupper($name)) == "ORDER BY") {
				if(sizeof($value) != 2 && substr($value[0], -2) != "()") {
					throw new Exception('wrong_arg_nmbr_order_by');
				}

				$request .= " ".$upName." ".implode(' ', $value);
			} else if(($upName = strtoupper($name)) == "LIMIT") {
				if(sizeof($value) == 1) {
					// La colonne "limit" ne contient qu'un nombre de champs
					$request .= " $upName ".$value[0];
				} else if(sizeof($value) == 2) {
					// La colonne "limit" contient un index de départ et un nombre de champs
					$request .= " $upName ".$value[0].",".$value[1];
				} else {
					throw new Exception('wrong_arg_numbr_limit');
				}
			} else {
				throw new Exception('unknown_arg');
			}
		}

		$stmt = $this->bdd->prepare($request);

		if($stmt->execute($arrayVerif)) {
			return $stmt->fetchAll();
		} else {
			return null;
		}
	}

	function Insert($table, $values) {
		$request = "INSERT INTO $table(";
		$valeurs = "VALUES(";
		$arrayVerif = array();
		foreach($values as $name=>$value) {
			$request .= $name.",";
			$valeurs .= "?,";
				array_push($arrayVerif, $value);
		}

		$request = substr($request, 0, -1).") ".substr($valeurs, 0, -1).")";

		$stmt = $this->bdd->prepare($request);

		$stmt->execute($arrayVerif);
	}

	function Update($table, $update) {
		$request = "UPDATE $table SET ";
		$arrayVerif = array();
		foreach($update['set'] as $name=>$value) {
			$request .= $name."=?,";
			array_push($arrayVerif, $value);
		}
		$request = substr($request, 0, -1)." WHERE ";
		foreach($update['where'] as $value) {
			$request .= $value[0].$value[1]."? AND ";
			array_push($arrayVerif, $value[2]);
		}
		$request = substr($request, 0, -5);

		$stmt = $this->bdd->prepare($request);
		$stmt->execute($arrayVerif);
	}

	function beginTransaction() {
		$this->bdd->beginTransaction();
	}

	function commit() {
		$this->bdd->commit();
	}
}