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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,154 @@ | ||
| <?php | ||
|
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| namespace App\Services; | ||
|
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| use Carbon\Carbon; | ||
| use Illuminate\Support\Facades\Http; | ||
|
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| class TracksService | ||
| { | ||
| public const NAT_NOTAMS_URL = 'https://www.notams.faa.gov/common/nat.html'; | ||
|
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| public const MONTHS = [ | ||
| 'JAN' => 1, 'FEB' => 2, 'MAR' => 3, 'APR' => 4, 'MAY' => 5, 'JUN' => 6, | ||
| 'JUL' => 7, 'AUG' => 8, 'SEP' => 9, 'OCT' => 10, 'NOV' => 11, 'DEC' => 12, | ||
| ]; | ||
|
|
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| public function getTmi(): ?int | ||
| { | ||
| $messages = $this->getMessages(); | ||
|
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| return $messages[0]['tmi'] ?? null; | ||
| } | ||
|
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| public function getTracks(): ?array | ||
| { | ||
| $tracks = []; | ||
|
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| foreach ($this->getMessages() as $message) { | ||
| foreach ($message['tracks'] as $track) { | ||
| $tracks[] = [ | ||
| 'ident' => $track['ident'], | ||
| 'route' => $track['route'], | ||
| 'valid_from' => $message['valid_from'], | ||
| 'valid_to' => $message['valid_to'], | ||
| 'flight_levels' => $track['flight_levels'], | ||
| ]; | ||
| } | ||
| } | ||
|
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| return $tracks; | ||
| } | ||
|
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| private function getMessages(): array | ||
| { | ||
| $html = Http::get(self::NAT_NOTAMS_URL)->body(); | ||
| $html = strip_tags($html); | ||
|
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| // Each NOTAM is enclosed in \x02, parentheses, and \n\v\x03... thanks FAA? | ||
| preg_match_all('/\x02\((.*?)\)\n\v\x03/s', $html, $matches); | ||
| $notams = $matches[1]; | ||
|
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| $messages = []; | ||
| $message = []; | ||
| foreach ($notams as $text) { | ||
| $lines = explode("\n", $text); | ||
|
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| // Each message is split into lines by \n | ||
| // Line 1 is the header, line 2 is the validity timespan, line 3 is the part header, | ||
| // the following lines are the part content, and the last line is the part footer. | ||
|
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| // Parse header | ||
| preg_match('/^NAT-([1-9])\/([1-9])/', $lines[0], $matches); | ||
| $currentPart = (int) $matches[1]; | ||
| $totalParts = (int) $matches[2]; | ||
|
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| // Parse validity | ||
| preg_match('/^([A-Z]{3}) ([0-9]{2})\/([0-9]{2})([0-9]{2})Z TO ([A-Z]{3}) ([0-9]{2})\/([0-9]{2})([0-9]{2})Z$/', $lines[1], $matches); | ||
| $validFrom = Carbon::create(year: null, month: self::MONTHS[$matches[1]], day: $matches[2], hour: $matches[3], minute: $matches[4]); | ||
| $validTo = Carbon::create(year: null, month: self::MONTHS[$matches[5]], day: $matches[6], hour: $matches[7], minute: $matches[8]); | ||
|
|
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| // Combine parts | ||
| $message = array_merge($message, array_slice($lines, 3, -1)); | ||
|
|
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| // Haven't received all parts yet | ||
| if ($currentPart !== $totalParts) { | ||
| continue; | ||
| } | ||
|
|
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| // Split the full message into its sections | ||
| $sections = []; | ||
| $section = []; | ||
| foreach ($message as $line) { | ||
| $section[] = rtrim($line, '-'); | ||
|
|
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| if (str_ends_with($line, '-')) { | ||
| $sections[] = implode("\n", $section); | ||
| $section = []; | ||
| } | ||
| } | ||
|
|
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| // Parse sections | ||
| $tracks = []; | ||
| $remarks = []; | ||
| foreach ($sections as $section) { | ||
| if (preg_match('/^([A-Z]) (.*?)\nEAST LVLS (.*?)\nWEST LVLS (.*?)\n/s', $section, $matches)) { | ||
| if ($matches[3] === 'NIL') { | ||
| $direction = 'west'; | ||
| $rawLevels = $matches[4]; | ||
| } elseif ($matches[4] === 'NIL') { | ||
| $direction = 'east'; | ||
| $rawLevels = $matches[3]; | ||
| } else { | ||
| $direction = 'unknown'; | ||
| $rawLevels = ''; | ||
| } | ||
|
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| $tracks[] = [ | ||
| 'ident' => $matches[1], | ||
| 'route' => $matches[2], | ||
| 'direction' => $direction, | ||
| 'flight_levels' => array_map(fn ($fl) => intval($fl) * 100, explode(' ', $rawLevels)), | ||
| ]; | ||
| } else { | ||
| $remarkLines = array_slice(explode("\n", $section), 1); | ||
|
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||
| $remark = []; | ||
| foreach ($remarkLines as $remarkLine) { | ||
| if (preg_match('/^\d+\. ?(.*)/', $remarkLine, $matches)) { | ||
| if ($remark) { | ||
| $remarks[] = implode("\n", $remark); | ||
| } | ||
|
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| $remark = [$matches[1]]; | ||
| continue; | ||
| } | ||
|
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| $remark[] = $remarkLine; | ||
| } | ||
| $remarks[] = implode("\n", $remark); | ||
| } | ||
| } | ||
|
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| $tmi = 0; | ||
| foreach ($remarks as $remark) { | ||
| if (preg_match('/^TMI IS ([0-9]{3})/', $remark, $matches)) { | ||
| $tmi = (int) $matches[1]; | ||
| break; | ||
| } | ||
| } | ||
|
|
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| // Finalize message | ||
| $messages[] = [ | ||
| 'tmi' => $tmi, | ||
| 'valid_from' => $validFrom, | ||
| 'valid_to' => $validTo, | ||
| 'tracks' => $tracks, | ||
| 'remarks' => $remarks, | ||
| ]; | ||
| $message = []; | ||
| } | ||
|
|
||
| return $messages; | ||
| } | ||
| } |
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