<?php

require_once ('dbutils.php');

defined('T_ORDER') || define ('T_ORDER', 0);
defined('T_BILL') || define ('T_BILL', 1);
defined('T_REMOVE') || define ('T_REMOVE', 2);
defined('T_BILLSTORNO') || define ('T_BILLSTORNO', 3);
defined('T_BILLSTORNOREMOVE') || define ('T_BILLSTORNOREMOVE', 4);
defined('T_FROM_TABLE') || define ('T_FROM_TABLE', 5);
defined('T_TO_TABLE') || define ('T_TO_TABLE', 6);

class CommonUtils {
	var $dbutils;
	private static $plugins = null;
	
	function __construct() {
		$this->dbutils = new DbUtils();
		// $this->products = new Products(); --> endless loop!
		// $this->lastSettingOfDisplayMode = "all";
		//error_reporting(E_ALL);
	}
	
	public static function setPluginConfig($plugins) {
	    self::$plugins = $plugins;
	}
	
	public static $g_units_arr = 
		array(
		    array("text" => "Stück","value" => 0,"id" => "piece"),
		    array("text" => "Eingabe","value" => 1,"id" => "piece"),
		    array("text" => "kg","value" => 2,"id" => "kg"),
		    array("text" => "gr","value" => 3,"id" => "gr"),
		    array("text" => "mg","value" => 4,"id" => "mg"),
		    array("text" => "l","value" => 5,"id" => "l"),
		    array("text" => "ml","value" => 6,"id" => "ml"),
		    array("text" => "m","value" => 7,"id" => "m")
		);
	
	public static function g_units_export_arr() {
		return array();
	} 

	function verifyLastBillId($pdo,$nextIdToUse) {
		if ($nextIdToUse == 1) {
			return true;
		}
		if (is_null($pdo)) {
			$pdo = $this->dbutils->openDbAndReturnPdo();
		}
		$nextIdToUse = intval($nextIdToUse);
		$sql = "SELECT value,signature FROM %work% WHERE item=?";
		$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
		$stmt->execute(array("lastbillid"));
		$row =$stmt->fetchObject();
		$lastBillid = intval($row->value);
		$lastBillInc = $lastBillid+1;
		
		if ($lastBillInc != $nextIdToUse) {
			return false;
		} else {
			$sql = "SELECT id FROM %bill% WHERE id=?";
			$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
			$stmt->execute(array($nextIdToUse));
			if ($stmt->rowCount() > 0) {
				return false;
			} else {
				// is there a gap or does the previous id exist?
				$sql = "SELECT id FROM %bill% WHERE id=?";
				$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
				$stmt->execute(array($nextIdToUse - 1));
				if ($stmt->rowCount() != 1) {
					return false;
				} else {
					return true;
				}
			}
			
		}
	}

	
	function getKeyFromWorkTable($pdo,$key) {
		$sql = "SELECT signature FROM %work% WHERE item=?";
		$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
		$stmt->execute(array($key));
		$row =$stmt->fetchObject();
		return($row->signature);
	}
	
	public static function setMd5OfLastBillidInWorkTable($pdo) {
		$sql = "SELECT value FROM %work% where item=?";
		$r = self::fetchSqlAll($pdo, $sql, array("lastbillid"));
		if (count($r) > 0) {
			$maxid = $r[0]["value"];
			$signature = md5("B($maxid)");
			$sql = "UPDATE %work% SET signature=? WHERE item=?";
			self::execSql($pdo, $sql, array($signature,"lastbillid"));
		}
	}
	
	function setLastBillIdInWorkTable($pdo,$lastBillId) {
		if (is_null($pdo)) {
			$pdo = $this->dbutils->openDbAndReturnPdo();
		}
		
		$signature = md5("B($lastBillId)");
		$sql = "UPDATE %work% SET value=?, signature=? WHERE item=?";
		$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
		$stmt->execute(array($lastBillId,$signature,"lastbillid"));
	}
	
	function verifyBill($pdo,$id) {
		if (is_null($pdo)) {
			$pdo = $this->dbutils->openDbAndReturnPdo();
		}

		$sql = "SELECT billdate,brutto,ROUND(netto,2) as netto,userid,IF(tax is not null, tax, '0.00') as tax,signature,status FROM %bill% WHERE id=?";
		$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
		$stmt->execute(array($id));
		$row = $stmt->fetchObject();
		
		$billdate =  $row->billdate;
		$brutto = $row->brutto;
		$netto = $row->netto;
		$tax = $row->tax;
		$userid = $row->userid;
		$signature = $row->signature;
		$status = $row->status;

		return(self::verifyBillByValues($pdo,$billdate, $brutto, $netto, $userid, $signature, $status));
	}
	
	public static function verifyBillByValues($pdo,$billdate,$brutto,$netto,$userid,$signature,$status) {
		
		if (($status == "c") && ($brutto == 0.00)) {
			// workaround - the signature for cash inserts of vaue 0.00 are sometimes incorrect
			return true;
		}
		
		if (is_null($signature)) {
			return false;
		}
		if (is_null($pdo)) {
			$pdo = DbUtils::openDbAndReturnPdoStatic();
		}

		$brutto = number_format($brutto, 2, ".", '');
		$netto = number_format($netto, 2, ".", '');
		
		$data = "D($billdate)B($brutto)N($netto)T(0)U($userid)";
		$md5OfData = md5($data);
		if ($signature != $md5OfData) {
			return false;
		} else {
			return true;
		}
	}
	
	public static function calcSignaturesForAllBills($pdo) {
		$sql = "SELECT id,billdate,brutto,netto,userid FROM %bill%";
		$r = CommonUtils::fetchSqlAll($pdo, $sql);
		$sql = "UPDATE %bill% SET signature=? WHERE id=?";
		foreach($r as $b) {
			$bruttostr = number_format($b["brutto"], 2, ".", '');
			$nettostr = number_format($b["netto"], 2, ".", '');
			$theTime = $b["billdate"];
			$userid = $b["userid"];
			$data = md5("D($theTime)B($bruttostr)N($nettostr)T(0)U($userid)");
			CommonUtils::execSql($pdo, $sql, array($data,$b["id"]));
		}
	}
		
	public static function calcSignatureForBill($theTime,$brutto,$netto,$userid) {
		// now calculate the signature for the bill entry
		$bruttostr = number_format($brutto, 2, ".", '');
		$nettostr = number_format($netto, 2, ".", '');
		$data = "D($theTime)B($bruttostr)N($nettostr)T(0)U($userid)";
		$signature = md5($data);
		return $signature;
	}
	
	function createGridTableWithSqrtSizeOfButtons ($inputArray) {
		// create a table that is optimal (sqrt-like size)
		$numberOfIcons = count($inputArray); 
		if ($numberOfIcons == 0) {
			// no items to display
			return;
		}
		$numberOfCols = ceil(sqrt($numberOfIcons));
		$porcentageWidth = floor(100/$numberOfCols);
		
		echo '<table class=gridtable>';
		$colcounter = 0;
		for ($index=0;$index<$numberOfIcons;$index++) {
			if ($colcounter == 0) {
				echo "<tr><td>";
			}
			$anEntry = $inputArray[$index];
			$textOfButton = $anEntry["textOfButton"]; #
			$onClickMethod = $anEntry["onClickMethod"]; // With parameters!
			
			$button = '<input type="button" value="' . $textOfButton . '"';			
			$button = $button . ' onclick="' . $onClickMethod . '"';
			$button = $button . ' style="height: 50px; width:' . $porcentageWidth . '%; font-size:20px; background-color:#b3b3c9" />';
			echo $button;
			$colcounter++;
			if ($colcounter == $numberOfCols) {
				$colcounter = 0;
				echo "</tr>";
			}
		}
		echo "</tr>";
		echo "</table>";
	}
	
	
	function createGridTableWithSqrtSizeOfStyleButtons($inputArray) {
		$this->createGridTableWithSqrtSizeOfStyleButtonsAndHeader($inputArray,'','dummy');
	}
	
	function getTableNameFromId($pdo,$tableid) {
		if (is_null($tableid) || ($tableid == 0)) {
			return "-"; // togo
		}
		$sql = "SELECT tableno FROM %resttables% WHERE id=?";
		$stmt = $pdo->prepare(DbUtils::substTableAlias($sql));
		$stmt->execute(array($tableid));
		$row = $stmt->fetchObject();
		return $row->tableno;
	}
	
	function getCurrentPriceLevel($pdo) {
		$sql = "SELECT setting FROM %config% WHERE name='pricelevel'";
		$stmt = $pdo->prepare(DbUtils::substTableAlias($sql));
		$stmt->execute();
		$row = $stmt->fetchObject();
		$pricelevelid = $row->setting;
		
		$sql = "SELECT id,name FROM %pricelevel% WHERE id=?";
		$stmt = $pdo->prepare(DbUtils::substTableAlias($sql));
		$stmt->execute(array($pricelevelid));
		$row = $stmt->fetchObject();
		$pricelevelname = $row->name;
		
		return (array("id" => $pricelevelid, "name" => $pricelevelname));
	}
	
	function createGridTableWithSqrtSizeOfStyleButtonsAndHeader ($inputArray,$headline,$headercolor) {
		// create a table that is optimal (sqrt-like size)
		$numberOfIcons = count($inputArray);
		if ($numberOfIcons == 0) {
			// no items to display
			return;
		}
		$numberOfCols = ceil(sqrt($numberOfIcons));
		$porcentageWidth = floor(100.0/$numberOfCols);
	
		echo '<table class=gridtable>';
		
		// Headline
		if ($headline <> '') {
			echo '<tr><th style="background-color:#' . $headercolor . '">' . $headline . '</th>';
		}
		
		$colcounter = 0;
		for ($index=0;$index<$numberOfIcons;$index++) {
			if ($colcounter == 0) {
				echo "<tr><td>";
			}
			$anEntry = $inputArray[$index];
			$textOfButton = $anEntry["textOfButton"]; #
			$onClickMethod = $anEntry["onClickMethod"]; // With parameters!
			$style = $anEntry["style"];
				
			$button = '<input type="button" value="' . $textOfButton . '"';
			$button = $button . ' onclick="' . $onClickMethod . '"';
			$button = $button . ' style="' . $style . '; width:' . $porcentageWidth . '%;" />';
			echo $button;
			$colcounter++;
			if ($colcounter == $numberOfCols) {
				$colcounter = 0;
				echo "</tr>";
			}
		}
		echo "</tr>";
		echo "</table>";
	}
	
	function getCurrency() {
		$pdo = $this->dbutils->openDbAndReturnPdo();
		
		$sql = "SELECT setting from %config% where name='currency'";
		$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
		$stmt->execute();
		$row =$stmt->fetchObject();
		if ($row != null) {
			return $row->setting;
		} else {
			return "Euro";
		}
	}
	
	public static function getRowSqlObject($pdo,$sql,$params = null) {
		$stmt = $pdo->prepare(DbUtils::substTableAlias($sql));
		if (is_null($params)) {
			$stmt->execute();
		} else {
			$stmt->execute($params);
		}
		return ($stmt->fetchObject());
	}
	public static function fetchSqlAll($pdo,$sql,$params = null) {
		$stmt = $pdo->prepare(DbUtils::substTableAlias($sql));
		if (is_null($params)) {
			$stmt->execute();
		} else {
			$stmt->execute($params);
		}
		return ($stmt->fetchAll(PDO::FETCH_ASSOC));
	}
	
	public static function execSql($pdo,$sql,$params) {
		$stmt = $pdo->prepare(DbUtils::substTableAlias($sql));
		if (is_null($params)) {
			$stmt->execute();
		} else {
			$stmt->execute($params);
		}
	}
	
	public static function getConfigValueStmt($pdo,$stmt,$item,$default) {
	    $stmt->execute(array($item));
	    $row =$stmt->fetchObject();
	    if ($row->countid == 0) {
		return $default;
	    } else {
		return self::getExistingConfigValue($pdo, $item);
	    }
	}
	
	public static function getConfigValue($pdo,$item,$default) {
	    $sql = "SELECT count(id) as countid FROM %config% WHERE name=?";
	    $stmt = $pdo->prepare(DbUtils::substTableAlias($sql));
	    $stmt->execute(array($item));
	    $row =$stmt->fetchObject();
	    if ($row->countid == 0) {
		return $default;
	    } else {
		return self::getExistingConfigValue($pdo, $item);
	    }
	}
	
	public static function getExistingConfigValue($pdo,$item) {
	    $sql = "SELECT setting FROM %config% WHERE name=?";
	    $stmt = $pdo->prepare(DbUtils::substTableAlias($sql));
	    $stmt->execute(array($item));
	    $row = $stmt->fetchObject();
	    return $row->setting;
	}
	
	public static function callPlugin($pdo,$fct,$condition) {
	    try {
		if (!is_null(self::$plugins)) {
		    if (array_key_exists($fct,self::$plugins)) {
			$plugin = self::$plugins->$fct;
			if (($plugin->execution) === $condition) {
			    $cls = $plugin->PluginClass;
			    $fct=$plugin->PluginFct;
			    $call = "Plugin\\$cls::$fct";
			    call_user_func($call,$pdo);
			    return true;
			}
		    }
		}
	    } catch(Exception $e) { }
	    return false;
	}
	
	public static function log($pdo, $component, $message) {
		$dblog = self::getConfigValue($pdo, "dblog", 1);
		if ($dblog == 1) {
			date_default_timezone_set(DbUtils::getTimeZoneDb($pdo));
			$currentTime = date('Y-m-d H:i:s');
			$sql = "INSERT INTO %log% (date,component,message) VALUES(?,?,?)";
			$stmt = $pdo->prepare(DbUtils::substTableAlias($sql));
			$stmt->execute(array($currentTime, $component, $message));
		}
	}

	public static function getLog($pdo) {
	    $sql = "SELECT date,component,message FROM %log%";
	    $stmt = $pdo->prepare(DbUtils::substTableAlias($sql));
	    $stmt->execute();
	    $result = $stmt->fetchAll();
	    $txt = "";
	    foreach ($result as $aLogLine) {
		$txt .= $aLogLine["date"] . ";" . $aLogLine["component"] . ";" . $aLogLine["message"] . "\n";
	    }
	    return $txt;
	}
	
	public static function getLastLog($pdo) {
	    $sql = "SELECT date,component,message FROM %log% WHERE DATE_SUB(NOW(),INTERVAL 2 HOUR) <= date";
	    $stmt = $pdo->prepare(DbUtils::substTableAlias($sql));
	    $stmt->execute();
	    $result = $stmt->fetchAll();
	    $txt = "";
	    foreach ($result as $aLogLine) {
		$txt .= $aLogLine["date"] . ";" . $aLogLine["component"] . ";" . $aLogLine["message"] . "\n";
	    }
	    return $txt;
	}
	
	public static function keepOnlyLastLog($pdo) {
	    $sql = "DELETE FROM %log% WHERE DATE_SUB(NOW(),INTERVAL 2 HOUR) > date";
	    $stmt = $pdo->prepare(DbUtils::substTableAlias($sql));
	    $stmt->execute();
	}
	
	public static function strEndsWith($haystack, $needle)
	{
		return $needle === "" || substr($haystack, -strlen($needle)) === $needle;
	}
	
	public static function startsWith($aText, $needle)
        {
                return $needle === "" || strpos($aText, $needle) === 0;
        }
	
	public static function caseOfSqlUnitSelection($pdo) {
		$decpoint = htmlspecialchars(CommonUtils::getConfigValue($pdo, "decpoint", "."));
		$unit = "CASE ";
		foreach(CommonUtils::$g_units_arr as $aUnit) {
			if ($aUnit["value"] > 1) {
				$unit .=  " WHEN Q.unit='" . $aUnit["value"] . "' THEN CONCAT(REPLACE(unitamount,'.','$decpoint'),'" . $aUnit["text"] . "',' ') "; 
			}
		}
		$unit .= " ELSE '' ";
		$unit .= "END";
		return $unit;
	}
	
	public static function scaleImg($fn,$maxDim) {
		list($width, $height, $type, $attr) = getimagesize($fn);
		$size = getimagesize($fn);
		$ratio = $size[0] / $size[1]; // width/height
		if ($ratio > 1) {
			$width = $maxDim;
			$height = $maxDim / $ratio;
		} else {
			$width = $maxDim * $ratio;
			$height = $maxDim;
		}
		$src = imagecreatefromstring(file_get_contents($fn));
		$dst = imagecreatetruecolor($width, $height);
		imagealphablending($dst, false);
		imagesavealpha($dst, true);
		$transparent = imagecolorallocatealpha($dst, 255, 255, 255, 127);
		imagefilledrectangle($dst, 0, 0, $width, $height, $transparent);

		imagecopyresampled($dst, $src, 0, 0, 0, 0, $width, $height, $size[0], $size[1]);
		imagedestroy($src);
		ob_start();
		imagepng($dst); // adjust format as needed
		$imagedata = ob_get_contents();
		ob_end_clean();
		imagedestroy($dst);
		return $imagedata;
	}

	public static function getFirstSqlQuery($pdo,$sql,$params,$default) {
		$result = self::fetchSqlAll($pdo, $sql, $params);
		if (count($result) > 0) {
			return $result[0]["value"];
		} else {
			return $default;
		}
	}
}