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164 lines
4.9 KiB
164 lines
4.9 KiB
<?php
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namespace App\Http\Controllers;
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use Laravel\Lumen\Routing\Controller as BaseController;
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use Illuminate\Http\Request;
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use DB, Log;
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use Quartz;
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use DateTime, DateTimeZone, DateInterval;
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use App\Jobs\TripComplete;
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class LocalTime extends BaseController
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{
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public function find(Request $request) {
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$token = $request->input('token');
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if(!$token)
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return response(json_encode(['error' => 'no token provided']))->header('Content-Type', 'application/json');
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$db = DB::table('databases')->where('read_token','=',$token)->first();
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if(!$db)
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return response(json_encode(['error' => 'invalid token']))->header('Content-Type', 'application/json');
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$qz = new Quartz\DB(env('STORAGE_DIR').$db->name, 'r');
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$timezones = [
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'-23:00','-22:00','-21:00','-20:00',
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'-19:00','-18:00','-17:00','-16:00','-15:00','-14:00','-13:00','-12:00','-11:00','-10:00',
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'-09:00','-08:00','-07:00','-06:00','-05:00','-04:00','-03:00','-02:00','-01:00','+00:00',
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'+01:00','+02:00','+03:00','+04:00','+05:00','+06:00','+07:00','+08:00','+09:00','+10:00',
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'+11:00','+12:00','+13:00','+14:00','+15:00','+16:00','+17:00','+18:00','+19:00','+20:00',
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'+21:00','+22:00','+23:00',
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];
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$date = false;
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if($input=$request->input('input')) {
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// Strict input format
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if(preg_match('/^[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2}$/', $input)) {
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$date = $input;
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} else {
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// Invalid format
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}
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}
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if(!$date) {
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return response(json_encode(['error' => 'invalid date provided']))->header('Content-Type', 'application/json');
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}
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$candidates = [];
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foreach($timezones as $tz) {
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// Interpret the input date in each timezone
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$date = DateTime::createFromFormat('Y-m-d H:i:s', $input, new DateTimeZone($tz));
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// Find the closest record to that absolute timestamp
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if($record = $this->_find_closest_record($qz, $date)) {
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if($record->data) {
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$local = $this->_timezone_for_location($record->data->geometry->coordinates[1], $record->data->geometry->coordinates[0], $record->date->format('c'));
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$diff = strtotime($local->localtime) - strtotime($date->format('c'));
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// Find the record where the localized timezone offset matches the candidate offset
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if($tz == $local->date->format('P')) {
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$candidates[] = [
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'record' => $record->data,
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'local' => $local,
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'tz' => $tz,
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'diff' => $diff
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];
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}
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}
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}
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}
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// Choose the candidate with the smallest absolute time difference
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usort($candidates, function($a, $b){
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return abs($a['diff']) < abs($b['diff']) ? -1 : 1;
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});
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if(count($candidates)) {
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$record = $candidates[0];
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$response = [
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'data' => $record['record'],
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'timezone' => [
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'offset' => $record['local']->offset,
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'seconds' => $record['local']->seconds,
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'localtime' => $record['local']->localtime,
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'name' => $record['local']->name,
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]
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];
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} else {
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$response = ['data'=>null];
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}
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return response(json_encode($response))->header('Content-Type', 'application/json');
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}
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private function _timezone_for_location($lat, $lng, $date) {
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$tz = \p3k\Timezone::timezone_for_location($lat, $lng, $date);
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return new TimezoneResult($tz, $date);
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}
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private function _find_closest_record($qz, $date) {
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// TODO: move this logic into QuartzDB
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// Load the shard for the given date
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$shard = $qz->shardForDate($date);
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// If the shard doesn't exist, check one day before
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if(!$shard->exists()) {
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$date = $date->sub(new DateInterval('PT86400S'));
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$shard = $qz->shardForDate($date);
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}
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// Now if the shard doesn't exist, return an empty result
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if(!$shard->exists()) {
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return false;
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}
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// Start iterating through the shard and look for the last line that is before the given date
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$shard->init();
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$record = false;
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foreach($shard as $r) {
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if($r && $r->date > $date)
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break;
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$record = $r;
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}
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return $record;
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}
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}
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class TimezoneResult {
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public $timezone = null;
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private $_now;
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private $_name;
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public function __construct($timezone, $date=false) {
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if($date)
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$this->_now = new DateTime($date);
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else
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$this->_now = new DateTime();
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$this->_now->setTimeZone(new DateTimeZone($timezone));
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$this->_name = $timezone;
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}
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public function __get($key) {
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switch($key) {
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case 'date':
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return $this->_now;
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case 'offset':
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return $this->_now->format('P');
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case 'seconds':
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return (int)$this->_now->format('Z');
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case 'localtime':
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return $this->_now->format('c');
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case 'name':
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return $this->_name;
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}
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}
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public function __toString() {
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return $this->_name;
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}
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}
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