466 lines
12 KiB
PHP
466 lines
12 KiB
PHP
<?php
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namespace service;
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use \database\core\DatabaseDriver;
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use \service\Tesseract;
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class CalendarExtractor{
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/* [1] Attributes
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=========================================================*/
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private $start_d = null; // 1st day date
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private $img_url = null; // image url
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private $d_uid = null; // diplome uid
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private $img_res = null; // image resource
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private $event = []; // events
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/* [2] Constants
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=========================================================*/
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public static $start_y = 79; // start y
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public static $stop_y = 699; // stop y
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public static $start_h = 8; // start hour
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public static $stop_h = 20; // stop hour
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/* (1) Builds a calendar extractor
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*
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* @d_uid<String> UID of the diplome
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* @img_url<String> URL of the string to extract from
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* @start_d<String> Date of the first day
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*
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* @return instance<CalendarExtractor> Instance
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*
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---------------------------------------------------------*/
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public function __construct($d_uid=null, $img_url=null, $start_d=null){
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/* [1] Check arguments
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=========================================================*/ {
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/* (1) Check type */
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if( !is_string($img_url) || !is_string($start_d) )
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throw new \Exception("CalendarExtractor.__construct(<String>, <String>, <String>) expected but CalendarExtractor.__construct(<".gettype($d_uid).">, <".gettype($img_url).">, <".gettype($start_d).">) received");
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/* (2) Check @img_url link availability */
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if( !($img_head=@get_headers($img_url)) )
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throw new \Exception("CalendarExtractor.__construct(<String>, <URL>, <String>) received but cannot reach <URL>");
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if( !preg_match('@HTTP.+200@', $img_head[0]) )
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throw new \Exception("CalendarExtractor.__construct(<String>, <URL>, <String>) received but cannot reach <URL>");
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/* (3) Check @start_d format */
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if( !preg_match("@^\d{1,2}-\d{1,2}-\d{3,}$@", $start_d) )
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throw new \Exception("CalendarExtractor.__construct(<String>, <String>, <DATE>) received <DATE> has not the correct format");
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/* (4) Check @d_uid format */
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if( !preg_match("@^T\d+$@", $d_uid) )
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throw new \Exception("CalendarExtractor.__construct(<UID>, <String>, <String>) received <UID> has not the correct format");
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}
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/* [2] Fetch file
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=========================================================*/ {
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/* (1) Try to open file with GD */
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$this->img_res = @imagecreatefrompng($img_url);
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/* (2) Manage error */
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if( !$this->img_res )
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throw new \Exception("URL is not a JPEG image, or is unreachable");
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/* (3) Register data */
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$this->img_url = $img_url;
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$this->d_uid = $d_uid;
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$this->start_d = $start_d;
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}
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}
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/* (2) Extracts calendar data from image
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*
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* @return error<bool> FALSE on error
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*
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---------------------------------------------------------*/
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public function process(){
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/* [1] Global variables
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=========================================================*/ {
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/* (1) Image size */ {
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// {1} Request for size //
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$img_siz = @getimagesize($this->img_url);
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// {2} If error //
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if( !$img_siz )
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throw new \Exception("Cannot get image size");
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$img_siz = [
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'w' => $img_siz[0],
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'h' => $img_siz[1]
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];
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}
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}
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/* [2] Extract day limits
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=========================================================*/ {
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/* (1) Will contain the column+1 w index */
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$col_ind = [];
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/* (2) Extract column indexes */
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for( $x = 0 ; $x < $img_siz['w'] ; $x++ ){
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if( $this->getColor($x, 62) <= 10 )
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$col_ind[] = $x+1;
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}
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}
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/* [3] For each day -> get events
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=========================================================*/ {
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$uid = 0;
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/* (1) For each day */
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for( $day_n = 0 ; $day_n < count($col_ind)-1 ; $day_n++ ){
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$col_x = $col_ind[$day_n];
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/* (2) For each y pixel -> exctract event */
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for( $y = self::$start_y ; $y < self::$stop_y ; $y++ ){
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/* (3) Get current color + next */
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$p = $this->getColor($col_x, $y);
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$p1 = $this->getColor($col_x, $y+1);
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$color = '#'.str_pad(dechex($p1), 6, '0', STR_PAD_LEFT);
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/* (4) If on black pixel and next not white */
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if( $p == 0 && $p1 != 0xffffff ){
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// {1} calculate time //
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$start_y = $y;
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$time = $this->yToTime($day_n, $start_y);
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// {2} Incr uid //
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$uid++;
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// {3} Store event start //
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$this->event[$uid][$time] = [];
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// {4} Seek end of event //
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$y++;
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while( $y < self::$stop_y && $this->getColor($col_x, $y) != 0 )
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$y++;
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// {5} If end reached //
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$this->event[$uid][$time] = [ $this->yToTime($day_n, $y) ];
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// {6} Exctract event's image //
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$ev = $this->extractEvent("$time-$uid", [$col_x, $start_y+1], [$col_ind[$day_n+1]-1, $y]);
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/* {7} Check @event if already exists */ {
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$read_name = is_null($ev['name']) ? '?' : $ev['name'];
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$sqlr = DatabaseDriver::getPDO()->prepare("SELECT id_event FROM event WHERE basename = :bn AND color = :c AND id_diplome = :idd");
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$sqlr->execute([ ':bn' => $read_name, ':c' => $color, ':idd' => $this->d_uid ]);
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$fetched = $sqlr->fetch();
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// {7.1} If not found in db -> insert //
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if( !$fetched ){
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// {7.2} Insert new event //
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$sqlr = DatabaseDriver::getPDO()->prepare("INSERT INTO event(id_event,basename,color,id_diplome,name) VALUES(DEFAULT,:bn,:c,:idd,:n)");
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$sqlr->execute([ ':c' => $color, ':idd' => $this->d_uid, ':bn' => $read_name, ':n' => $read_name ]);
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// {7.3} Store id in current event //
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$event_id = DatabaseDriver::getPDO()->lastInsertId();
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}else
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$event_id = $fetched['id_event'];
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}
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/* (8) Check @location if already exists */ {
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$read_location = is_null($ev['location']) ? '?' : $ev['location'];
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$sqlr = DatabaseDriver::getPDO()->prepare("SELECT id_location FROM location WHERE basename = :bn AND id_event = :ide");
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$sqlr->execute([ ':bn' => $read_location, ':ide' => $event_id ]);
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$fetched = $sqlr->fetch();
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// {8.1} If not found in db -> insert //
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if( !$fetched ){
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// {8.2} Insert new location //
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$sqlr = DatabaseDriver::getPDO()->prepare("INSERT INTO location(id_location,id_event,basename,name) VALUES(DEFAULT,:ide,:bn,:n)");
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$sqlr->execute([ ':ide' => $event_id, ':bn' => $read_location, ':n' => $read_location ]);
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// {8.3} Store id in current location //
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$location_id = DatabaseDriver::getPDO()->lastInsertId();
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}else
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$location_id = $fetched['id_location'];
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}
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/* (9) Store local data for ics */
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$this->event[$uid][$time][1] = $location_id;
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}
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}
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}
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}
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}
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/* (3) Exctracts an event using OCR
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*
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* @uid<String> Image uid
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* @start<Array> Start rect (x, y)
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* @stop<Array> Stop rect (x, y)
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*
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---------------------------------------------------------*/
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public function extractEvent($uid, $start=null, $stop=null){
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$link = __ROOT__."/tmp/$uid.jpeg";
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$width = $stop[0]-$start[0];
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$height = $stop[1]-$start[1];
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$resize_factor = 2;
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/* [1] Get the right clip
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=========================================================*/ {
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/* (1) Create clipped copy */
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$clip = \imagecreatetruecolor($width*$resize_factor, $height*$resize_factor);
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$copied = \imagecopyresized(
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$clip, // destin img
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$this->img_res, // source img
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0, // dest x
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0, // dest y
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$start[0], // src x
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$start[1], // src y
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$width*$resize_factor, // dest w
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$height*$resize_factor, // dest h
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$width, // src w
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$height // src h
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);
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/* (2) Manage copy error */
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if( !$copied )
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return [ 'name' => null, 'location' => null ];
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/* (3) Save to jpeg */
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\imagesavealpha($clip, true);
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// ob_start();
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\imagejpeg($clip, $link);
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// $image_data = \base64_encode(ob_get_contents());
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// ob_end_clean();
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}
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/* [2] Apply Tesseract
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=========================================================*/ {
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/* (1) Load image with tesseract */
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try{
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$tesseract = new Tesseract($link);
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$read = $tesseract->read();
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/* (2) Manage error */
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}catch(\Exception $e){
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return [ 'name' => null, 'location' => null ];
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}
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}
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/* [3] End procedure
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=========================================================*/
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/* (1) Remove file */
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unlink($link);
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/* (2) Return read value */
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return $read;
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}
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/* (3) Get a pixel's color
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*
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* @x<int> X coordinate
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* @y<int> Y coordinate
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*
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* @return color<u_int32> Raw color
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*
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---------------------------------------------------------*/
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private function getColor($x, $y){
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return imagecolorat($this->img_res, $x, $y);
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}
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/* (4) Get time from a y-coordinate
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*
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* @day_n<int> Day relative index
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* @y<int> y Coordinate
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*
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* @return time<String> Formatted time (HH:mm)
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*
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---------------------------------------------------------*/
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private function yToTime($day_n, $y){
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/* [1] Get the date
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=========================================================*/ {
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/* (1) Get the day's date */
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$day_ts = strtotime($this->start_d." + $day_n days");
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/* (2) Format it */
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$day = date('Ymd', $day_ts);
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}
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/* [2] Get the time
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=========================================================*/{
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/* (1) Get the time */
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$time = self::$start_h + (self::$stop_h-self::$start_h) * ($y-self::$start_y) / (self::$stop_y-self::$start_y);
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/* (2) Calculate hour form time */
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$hour = floor($time);
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/* (3) Calculate min from time */
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$min = round( 60 * ($time-$hour) );
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/* (4) Round minutes to 10min */
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$min = round($min/10)*10;
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/* (5) Format to 2-digit */
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$hour = ( $hour < 10 ) ? "0$hour" : $hour;
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$min = ( $min < 10 ) ? "0$min" : $min ;
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}
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/* [3] Convert to GMT (UTC+0)
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=========================================================*/
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/* (1) Set fixed timezone offset */
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$tz_offset = +2;
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/* (2) Get GMT (UTC+0) timestamp */
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$ts = strtotime("${day} $hour:$min:00") - (3600*$tz_offset);
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/* (3) Return GMT date */
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return date("Ymd\THis\Z", $ts);
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}
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/* (5) Generate ICS output
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*
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* @return ics<String> ICS Representation of the events
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*
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---------------------------------------------------------*/
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public function toIcs(){
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$RAW = "";
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/* [1] For each event
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=========================================================*/
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foreach($this->event as $event_col=>$events){
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/* (2) For each event of each type
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---------------------------------------------------------*/
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foreach($events as $start_t=>$data){
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/* (1) If a name -> Search if there is a correction in the database */
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$sqlr = DatabaseDriver::getPDO()->prepare("SELECT e.id_event as ide, l.id_location as idl, l.id_location as idl e.name as ename, l.name as lname FROM event as e, location as l WHERE e.id_event = l.id_event AND l.id_location= :idl");
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$sqlr->execute([ ':idl' => $data[1] ]);
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/* (2) Default values */
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$ide = -1;
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$idl = -1;
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$name = '?';
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$location = '?';
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/* (2) If a match found -> set it */
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if( ($fetched=$sqlr->fetch()) ){
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$ide = $fetched['ide'];
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$idl = $fetched['idl'];
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$name = $fetched['ename'];
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$location = $fetched['lname'];
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}
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/* (3) Build ICS event */
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$RAW .= "BEGIN:VEVENT\n";
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$RAW .= "DTSTAMP:".gmdate("Ymd\THis\Z", time())."\n"; // required
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$RAW .= "DTSTART:${start_t}\n";
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$RAW .= "DTEND:${data[0]}\n";
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$RAW .= "UID:$start_t\n"; // required
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$RAW .= "DESCRIPTION:event@$ide\n"; // event@id_event
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$RAW .= "SUMMARY:$name\n";
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$RAW .= "DESCRIPTION:location@$idl\n"; // location@id_location
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$RAW .= "LOCATION:$location\n";
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$RAW .= "CATEGORIES: UPPA Calendar\n";
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$RAW .= "END:VEVENT\n";
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}
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}
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return $RAW;
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}
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} |