<?php

	namespace service;

	use \database\core\DatabaseDriver;


	class Updater{

		/* [1] Attributes
		=========================================================*/
		private $config = null;
		private $d_data = null;


		/* (1) Constructs and initialise an updater
		*
		* @d_id<String>						Diplome id to update (only)
		*
		* @return instance<Updater>			New Updater
		*
		---------------------------------------------------------*/
		public function __construct($d_id=null){

			/* [1] Fetch config
			=========================================================*/ {

				/* (1) Try to load the configuration */
				$this->config = Config::load("http://sciences.univ-pau.fr/edt/_ressource.js", "http://sciences.univ-pau.fr/edt/_periode.js");

				/* (2) If cannot fetch config */
				if( !($this->config instanceof Config) )
					throw new \Exception("Cannot fetch configuration");

			}


			$d_list = $this->config->getDiplomes();
			if( !is_null($d_id) && isset($d_list[$d_id]) )
				$this->d_data = [ $d_id, $d_list[$d_id] ];

		}


		/* (2) Update the ICS files
		*
		* @return error<bool>			FALSE on error
		*
		---------------------------------------------------------*/
		public function update(){


			/* [1] If only 1 diplome to update -> do it
			=========================================================*/
			if( is_array($this->d_data) ){

				$d_id   = $this->d_data[0];
				$d_name = $this->d_data[1];

				file_put_contents(__ROOT__."/tmp/$d_id.ics", "BEGIN:VCALENDAR\nVERSION:2.0\nPRODID:-//xdrm.io//NONSGML v1.0//EN\nMETHOD:PUBLISH\nX-WR-CALNAME: UPPA $d_name\n");
				\chmod(__ROOT__."/tmp/$d_id.ics", 0775);

				/* (1) Browse each date
				---------------------------------------------------------*/
				foreach($this->config->getPeriods() as $p_id=>$p_date){

					/* (1) Load image in the extractor */
					$calext = new CalendarExtractor($d_id, "http://sciences.univ-pau.fr/edt/diplomes/${d_id}${p_id}.png", $p_date);

					/* (2) Extract calendar data */
					$calext->process();

					/* (3) Get ICS events representation */
					$EVENTS = $calext->toIcs();

					/* (4) Add to file */
					file_put_contents(__ROOT__."/tmp/$d_id.ics", $EVENTS, FILE_APPEND);

				}

				file_put_contents(__ROOT__."/tmp/$d_id.ics", "END:VCALENDAR", FILE_APPEND);

				/* (2) Register update
				---------------------------------------------------------*/
				$sqlr = DatabaseDriver::getPDO()->prepare("UPDATE diplome SET updated_at = CURRENT_TIMESTAMP WHERE id_diplome = :idd");
				$sqlr->execute([ ':idd' => $d_id ]);


				return;

			}

			/* [2] Else -> Browse each diplome
			=========================================================*/
			foreach($this->config->getDiplomes() as $d_id=>$d_name){

				file_put_contents(__ROOT__."/tmp/$d_id.ics", "BEGIN:VCALENDAR\nVERSION:2.0\nPRODID:-//xdrm.io//NONSGML v1.0//EN\nMETHOD:PUBLISH\nX-WR-CALNAME:UPPA $d_name\n");
				\chmod(__ROOT__."/tmp/$d_id.ics", 775);

				/* (1) Browse each date
				---------------------------------------------------------*/
				foreach($this->config->getPeriods() as $p_id=>$p_date){

					/* (1) Load image in the extractor */
					$calext = new CalendarExtractor($d_id, "http://sciences.univ-pau.fr/edt/diplomes/${d_id}${p_id}.png", $p_date);

					/* (2) Extract calendar data */
					$calext->process();

					/* (3) Get ICS events representation */
					$EVENTS = $calext->toIcs();

					/* (4) Add to file */
					file_put_contents(__ROOT__."/tmp/$d_id.ics", $EVENTS, FILE_APPEND);

				}

				file_put_contents(__ROOT__."/tmp/$d_id.ics", "END:VCALENDAR", FILE_APPEND);

				/* (2) Register update
				---------------------------------------------------------*/
				$sqlr = DatabaseDriver::getPDO()->prepare("UPDATE diplome SET updated_at = CURRENT_TIMESTAMP WHERE id_diplome = :idd");
				$sqlr->execute([ ':idd' => $d_id ]);


			}
		}


	}